Biological safety cabinet

Abstract

The application belongs to the technical field of experimental equipment, and particularly relates to a biological safety cabinet. The application aims to solve the problem that the biological safety cabinet can only meet single experimental requirements and needs to be configured with multiple types of biological safety cabinets. The biological safety cabinet of the application has the following advantages. Part of the gas in the working area enters the circulating air duct through the air inlet and enters the working area again through the air outlet, and is recycled, which is conducive to reducing power consumption. Another part of the gas in the working area enters the exhaust air duct through the air inlet and is discharged through the indoor air outlet or the outdoor air outlet. When the outdoor air outlet is used for air exhaust, it is suitable for experiments of harmful chemical gas, chemical volatile gas and the like. When the indoor air outlet is used for air exhaust, it is conducive to improving the cleanliness of the air of the first workbench area and is suitable for standard microorganism experiments and the like. The biological safety cabinet of the application has low power consumption, is suitable for experiments with different requirements, and has a wide application range.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of experimental equipment, 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 material from the infectious aerosols and splashes that may be produced in the operation process when operating the primary culture, the bacterial strain and the diagnostic specimen and the like.

[0003] The biological safety cabinet can be divided into three categories of the first level, the second level and the third level to meet different biological research requirements. Among them, the second level biological safety cabinet is the most widely used cabinet type. In the second level biological safety cabinet, some biological safety cabinets circulate and filter the clean air after blowing through the working area and then blow the clean air to the working area again; some biological safety cabinets discharge the clean air to the outside after blowing through the working area; some biological safety cabinets discharge the gas to the outside after blowing through the working area; and some biological safety cabinets discharge the gas to the indoor after blowing through the working area.

[0004] Different experiments in the laboratory have different requirements, for example, the standard microorganism experiment and the experiment with harmful chemical substances or volatile substances have different requirements; the existing biological safety cabinet can only meet the single experimental requirement, and multiple types of biological safety cabinets need to be configured in the laboratory, which not only requires a large installation space, but also has a high cost. SUMMARY

[0005] In order to solve the above problems in the prior art, that is, to solve the problem that the biological safety cabinet can only meet the single experimental requirement and multiple types of biological safety cabinets need to be configured.

[0006] The application provides a biological safety cabinet, a cabinet body, a first workbench and two second workbenches; the cabinet body encloses a work area with an open front side, the cabinet body is provided with an air inlet below the front side of the work area, the cabinet body is provided with an air outlet at the top of the work area, the top of the cabinet body is provided with an indoor air outlet and an outdoor air outlet; when the indoor air outlet is configured to be open, the outdoor air outlet is configured to be closed; when the indoor air outlet is configured to be closed, the outdoor air outlet is configured to be open; a circulating air duct is formed in the cabinet body, the circulating air duct communicates with the air inlet and the air outlet; a first back air duct is formed in the cabinet body, the first end of the first back air duct respectively communicates with the indoor air outlet and the outdoor air outlet; the first workbench and the two second workbenches are horizontally installed in the cabinet body, and the two second workbenches are located on the two sides of the first workbench; a first bottom air duct is formed between the first workbench and the cabinet body; the first workbench is provided with an air suction port communicating with the first bottom air duct; the first bottom air duct and the second end of the first back air duct communicate to form an exhaust air duct; the gas in the work area corresponding to the second workbench enters the circulating air duct through the air inlet, and reenters the work area through the air outlet; the gas in the work area corresponding to the first workbench enters the exhaust air duct through the air suction port, and is discharged through the indoor air outlet or the outdoor air outlet.

[0007] In the optional technical scheme of the above biological safety cabinet, the top of the cabinet body is provided with a mounting port communicating with the first back air duct, an exhaust filter and an exhaust fan are mounted on the inner side of the mounting port; an exhaust cover is mounted on the outer side of the mounting port; the indoor air outlet is arranged on the exhaust cover; an exhaust pipe is mounted on the exhaust cover, and the exhaust pipe forms the outdoor air outlet.

[0008] In the optional technical scheme of the above biological safety cabinet, a control valve is mounted in the exhaust pipe, and the control valve is configured to control the opening or closing of the outdoor air outlet; an electric control door is mounted on the indoor air outlet, and the electric control door is configured to control the opening or closing of the indoor air outlet.

[0009] In the optional technical scheme of the above biological safety cabinet, the indoor air outlet is provided with two indoor air outlets arranged on the two sides of the exhaust pipe.

[0010] In the optional technical scheme of the above biosafety cabinet, the side surface of the exhaust cover is provided with an adjusting air outlet, and the top edge of the adjusting air outlet is hinged with an adjusting air door; the adjusting air door is configured to open towards the inside of the exhaust cover under the action of pressure in the exhaust cover to supplement air towards the inside of the exhaust cover; or the adjusting air door is configured to open towards the outside of the exhaust cover under the action of pressure in the exhaust cover to exhaust the gas in the exhaust cover.

[0011] In the optional technical scheme of the above biosafety cabinet, the top of the cabinet body is provided with a mounting port in communication with the first back air duct, and the mounting port forms the indoor air outlet; an exhaust pipe is selectively mounted on the mounting port, and the exhaust pipe forms the outdoor air outlet, so that the first end of the first back air duct is in communication with the outdoor air outlet.

[0012] In the optional technical scheme of the above biosafety cabinet, the first workbench is rectangular, and the four side edges of the first workbench are respectively provided with the air suction port; the air inlet is located in front of the air suction port on the front side edge of the first workbench.

[0013] In the optional technical scheme of the above biosafety cabinet, the cabinet body forms an air supply cavity on the top of the working area, the air supply cavity is provided with the air supply port on the side wall towards the working area, and the rear side wall of the air supply cavity is provided with a communication air port; the back of the cabinet body forms a second back air duct, the bottom of the cabinet body forms a second bottom air duct, the second bottom air duct is in communication with the air inlet and the second back air duct, the second back air duct is in communication with the air supply cavity through the communication air port; the second bottom air duct, the second back air duct and the air supply cavity form the circulating air duct.

[0014] In the optional technical scheme of the above biosafety cabinet, the second bottom air duct is located outside the first bottom air duct; and the second back air duct is located outside the first back air duct.

[0015] In the optional technical scheme of the above biosafety cabinet, at least part of the first back air duct passes through the air supply cavity and is in communication with the indoor air outlet or the outdoor air outlet; the communication air port is provided with two, and the two communication air ports are respectively located on the two sides of the first back air duct.

[0016] As can be understood by those skilled in the art, the biosafety cabinet of the present application comprises a cabinet body, a first workbench and two second workbenches, wherein the cabinet body encloses a work area with an open front side, the cabinet body is provided with an air inlet below the front side of the work area for sucking in air; the cabinet body is provided with an air outlet at the top of the work area for sending air into the work area; the top of the cabinet body is provided with an indoor air outlet and an outdoor air outlet, the indoor air outlet is used for discharging air indoors, and the outdoor air outlet is used for discharging air outdoors.

[0017] A circulating air duct is formed in the cabinet body, and the circulating air duct is communicated with the air inlet and the air outlet, so that the air sucked in by the air inlet returns to the work area again through the circulating air duct and the air outlet. A first back air duct is formed in the cabinet body, and the first back air duct is located at the back of the cabinet body, and a first end of the first back air duct is communicated with the indoor air outlet and the outdoor air outlet respectively; when the indoor air outlet is configured to be open, the outdoor air outlet is configured to be closed, and the air in the first back air duct is discharged through the indoor air outlet; when the indoor air outlet is configured to be closed, the outdoor air outlet is configured to be open, and the air in the first back air duct is discharged through the outdoor air outlet.

[0018] The air in the work area corresponding to the second workbench enters the circulating air duct through the air inlet and enters the work area again through the air outlet, and is recycled, so as to reduce power consumption. The air in the work area corresponding to the first workbench enters the exhaust air duct through the air inlet and is discharged through the indoor air outlet or the outdoor air outlet. When the air is discharged through the outdoor air outlet, it is suitable for experiments of harmful chemical gases, chemical volatile gases, etc. When the air is discharged through the indoor air outlet, it is beneficial to improve the cleanliness of the air in the first workbench area, and is suitable for standard microbiological experiments, etc. The biosafety cabinet of the present application has low power consumption, is suitable for experiments with different requirements, has a wide range of applications, and solves the problems of large installation space and high cost caused by arranging multiple biosafety cabinets. BRIEF DESCRIPTION OF DRAWINGS

[0019] The optional embodiments of the biosafety cabinet of the present application will be described below with reference to the accompanying drawings. The drawings are as follows:

[0020] Figure 1 is a front side schematic view of the biosafety cabinet provided by Embodiment One of the present application;

[0021] Figure 2 is a side schematic view of the biosafety cabinet provided by Embodiment One of the present application;

[0022] Figure 3 is a front side air flow schematic view of the biosafety cabinet in a first state provided by Embodiment One of the present application;

[0023] Figure 4 is a side air flow schematic view of the biosafety cabinet in a first state provided by Embodiment One of the present application;

[0024] Figure 5 is a schematic diagram of the gas flow direction of the front side of the biosafety cabinet in the second state provided in Embodiment One of the present application;

[0025] Figure 6 is a schematic diagram of the lateral gas flow direction of the biosafety cabinet in the second state provided in Embodiment One of the present application;

[0026] Figure 7 is a schematic diagram of the front side of the biosafety cabinet provided in Embodiment Two of the present application;

[0027] Figure 8 is a schematic diagram of the lateral side of the biosafety cabinet provided in Embodiment Two of the present application.

[0028] In the drawings: 100: cabinet body; 101: working area; 102: air inlet; 103: air outlet; 104: mounting port; 105: communication air port; 110: circulating air duct; 111: second back air duct; 112: second bottom air duct; 113: air supply air cavity; 120: exhaust air duct; 121: first back air duct; 122: first bottom air duct; 131: outer bottom plate; 132: middle bottom plate; 133: front end plate; 134: first connecting plate; 135: second connecting plate; 141: outer back plate; 142: middle back plate; 143: inner back plate; 150: partition plate; 160: top plate; 170: front cover; 180: side plate; 210: first working table; 220: second working table; 300: exhaust cover; 301: indoor air outlet; 302: outdoor air outlet; 303: adjusting air port; 310: exhaust pipe; 311: control valve; 320: electric control door; 330: adjusting air door; 410: exhaust filter; 420: exhaust fan; 510: air supply filter; 520: air supply fan. DETAILED DESCRIPTION

[0029] First, those skilled in the art should understand that these 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 adjust them as needed in order to adapt to specific application occasions.

[0030] Secondly, it should be noted that in the description of the embodiments of the present application, the terms indicating the direction or position relationship such as "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.

[0031] 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 directly connected, or indirectly connected through an intermediate medium, or it can be connected 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.

[0032] Biological safety cabinet is designed to protect the operator, laboratory environment and experimental materials from exposure to infectious aerosols and splashes that may be generated during the operation of primary cultures, virus strains and diagnostic specimens.

[0033] Biological safety cabinet can be divided into three categories of level one, level two and level three to meet different biological research requirements. Among them, the level two biological safety cabinet is the most widely used cabinet type. The level two biological safety cabinet can be divided into four levels according to the inlet air flow speed, exhaust mode and circulation mode: A1 type, A2 type, B1 type and B2 type. The minimum amount or measured average value of the air flow speed of the front window of the A1 type safety cabinet should be at least 0.38 m / s. 70% of the gas is recirculated to the working area through the HEPA filter, and 30% of the gas is discharged through the exhaust port. The minimum amount or measured average value of the air flow speed of the front window of the A2 type safety cabinet should be at least 0.5 m / s. 70% of the gas is recirculated to the working area through the HEPA filter, and 30% of the gas is discharged through the exhaust port. The level two B type biological safety cabinet is a safety cabinet connected to the exhaust system, and the minimum amount or measured average value of the air flow speed of the front window should be at least 0.5 m / s. The B1 type 70% of the gas is discharged through the exhaust port HEPA filter, and 30% of the gas is recirculated to the working area through the air supply port HEPA filter. The B2 type is a 100% full exhaust type safety cabinet without internal circulating air flow.

[0034] Different experiments in the laboratory have different requirements, for example, tissue culture, cell culture experiments; volatile toxic and harmful chemical substances, trace radioactive substances experiments, and experimental requirements are different. The existing biological safety cabinet can only meet the experimental requirements of a single type, so that multiple types of biological safety cabinets need to be configured in the laboratory, which not only requires a large installation space, but also has high cost.

[0035] Therefore, the biosafety cabinet provided in the embodiments of the present application has a first bottom air duct and a first back air duct, both of which are double-layer structures, and the inner bottom air duct and the inner back air duct are communicated to form an outer exhaust air duct, and the outer bottom air duct and the outer back air duct are communicated to form a circulating air duct. The gas entering the front window of the biosafety cabinet enters the circulating air duct and enters the working area through the air supply fan, and the air flow in the two side areas of the working area enters the circulating air duct; the air flow in the middle area of the working area enters the outer exhaust air duct and is discharged through the exhaust hood. In addition, the exhaust hood is provided with an indoor exhaust port and an outdoor exhaust port, and the gas in the exhaust hood can be discharged to the indoor through the indoor exhaust port or the outdoor exhaust port. Therefore, the biosafety cabinet provided in the embodiments of the present application can be applied to standard microbiological experiments when discharging gas to the indoor, and can be applied to harmful chemical gas, chemical volatile gas, etc. when discharging gas to the outdoor, and has low power consumption and flexible installation position.

[0036] The optional technical solutions of the biosafety cabinet provided in the embodiments of the present application will be described below with reference to the drawings.

[0037] First of all, it should be pointed out that in the embodiments of the present application, the direction is determined according to the orientation of the biosafety cabinet after installation. The orientation word "front" refers to the side where the front window of the biosafety cabinet is arranged, and the operator is located on the side of the front window to perform experimental operation on the first workbench; the orientation words "back" and "back" indicate the side away from the front window; in the drawings Figure 2 , the negative direction of the Y-axis indicates "front", and the positive direction of the Y-axis indicates "back"; the orientation word "top" indicates the side away from the ground; and the orientation word "bottom" indicates the side towards the ground. Figure 1 and 2 , the X-axis direction indicates the horizontal direction, the positive direction of the X-axis indicates "right side", the negative direction of the X-axis indicates "left side", and the Z-axis indicates the vertical direction.

[0038] Figure 1 is a front side schematic view of the biosafety cabinet provided in Embodiment One of the present application;

[0039] Figure 2 is a side schematic view of the biosafety cabinet provided in Embodiment One of the present application.

[0040] Referring to Figure 1 and Figure 2 , the biosafety cabinet provided in the embodiments of the present application includes a cabinet body 100, a first workbench 210 and two second workbenches 220, wherein the cabinet body 100 forms an air duct and a working area 101, and the first workbench 210 and the second workbenches 220 form experimental worktops.

[0041] The cabinet 100 of the embodiment of the present application encloses a work area 101 with a front opening. The front opening of the cabinet 100 is a front window of the biosafety cabinet, through which an operator operates on the first workbench 210 and the second workbench 220. The cabinet 100 is provided with air inlets 102 below the front side of the work area 101 for inhaling gas; as shown in Figure 1 The air inlets 102 are arranged in a horizontal direction and are uniformly spaced, which is beneficial to improve the air inlet area and the uniformity of air inlet. The cabinet 100 is provided with air outlets 103 at the top of the work area 101 for sending gas into the work area 101. The cabinet 100 is provided with indoor air outlets 301 and outdoor air outlets 302 at the top. The indoor air outlets 301 are used to exhaust air to the indoor, and the outdoor air outlets 302 are used to exhaust air to the outdoor.

[0042] A circulating air duct 110 is formed in the cabinet 100, and the circulating air duct 110 is connected to the air inlets 102 and the air outlets 103. In this way, the gas inhaled by the air inlets 102 returns to the work area 101 through the circulating air duct 110 and the air outlets 103.

[0043] In addition, a first back air duct 121 is formed in the cabinet 100, and the first back air duct 121 is located at the back of the cabinet 100. The first end of the first back air duct 121 is connected to the indoor air outlets 301 and the outdoor air outlets 302, respectively. When the indoor air outlets 301 are configured to be open, the outdoor air outlets 302 are configured to be closed, and the gas in the first back air duct 121 is exhausted through the indoor air outlets 301. When the indoor air outlets 301 are configured to be closed, the outdoor air outlets 302 are configured to be open, and the gas in the first back air duct 121 is exhausted through the outdoor air outlets 302. That is, the gas in the first back air duct 121 is exhausted through the outdoor air outlets 302 or the indoor air outlets 301.

[0044] The first workbench 210 and the two second workbenches 220 are horizontally installed in the cabinet 100, and the first workbench 210 and the cabinet 100 form a first bottom air duct 122. The first workbench 210 is provided with air inlets connected to the first bottom air duct 122. The first bottom air duct 122 and the second end of the first back air duct 121 are connected to form an exhaust air duct 120 for exhausting gas in the biosafety cabinet.

[0045] In the embodiment of the present application, the first workbench 210 is rectangular, and the four side edges of the first workbench 210 are respectively provided with air inlets. This arrangement is beneficial to form a negative pressure around the first workbench 210, and to ensure that the gas in the first workbench 210 is exhausted through the exhaust air duct 120, which is beneficial to prevent the overflow of contaminated air in the first workbench 210.

[0046] The two second worktables 220 of the embodiment of the application are respectively installed on the left and right sides of the first worktable 210, the air inlet 102 is arranged on the front side edge of the first worktable 210 and the two second worktables 220, and the air inlet 102 is located on the front side of the air suction port of the front side edge of the first worktable 210. The negative pressure is formed on the front side edge of the first worktable 210, so that the air in the front side area of the first worktable 210 and the second worktable 220 enters the circulating air duct 110 through the air inlet 102, which can not only supplement the gas in the biological safety cabinet, but also block the overflow of the contaminated gas in the first worktable 210 area.

[0047] Figure 3 is a schematic diagram of the gas flow direction of the front side of the first state of the biological safety cabinet provided in the embodiment one of the application; Figure 4 is a schematic diagram of the lateral gas flow direction of the first state of the biological safety cabinet provided in the embodiment one of the application; Figure 5 is a schematic diagram of the gas flow direction of the front side of the second state of the biological safety cabinet provided in the embodiment one of the application; Figure 6 is a schematic diagram of the lateral gas flow direction of the second state of the biological safety cabinet provided in the embodiment one of the application. In the drawing, the dashed line represents indoor gas, the solid line represents contaminated gas, and the dotted line represents gas after passing through the filter.

[0048] In combination with Figure 3 and Figure 4 , part of the gas in the working area 101 enters the circulating air duct 110 through the air inlet 102 and enters the working area 101 again through the air outlet 103, and is recycled, so as to reduce power consumption. Another part of the gas in the working area 101 enters the exhaust air duct 120 through the air suction port and is exhausted through the indoor air outlet 301 or the outdoor air outlet 302. When the air is exhausted through the outdoor air outlet 302 thereof, it is suitable for experiments of harmful chemical gas, chemical volatile gas and the like. In combination with Figure 5 and Figure 6 , when the air is exhausted through the indoor air outlet 301, it is beneficial to improve the cleanliness of the air in the first worktable 210 area, and is suitable for standard microorganism experiments and the like; in the embodiment of the application, the gas on the two sides of the working area 101, i.e. the gas above the second worktable 220, enters the circulating air duct 110 through the air inlet 102; the gas in the middle of the working area 101, i.e. the gas above the first worktable 210, enters the exhaust air duct 120 and is exhausted, so as to ensure the cleanliness of the air quality in the first worktable 210 area.

[0049] In the embodiment of the present application, the top of the cabinet body 100 is provided with a mounting opening 104 in communication with the first back air duct 121, and an exhaust filter 410 and an exhaust fan 420 are mounted on the inner side of the mounting opening 104. The exhaust fan 420 provides power for gas exhaust, and the exhaust filter 410 is used to filter the exhaust gas. An exhaust hood 300 is mounted on the outer side of the mounting opening 104, and the exhaust hood 300 and the top plate of the cabinet body 100 form an exhaust chamber. The exhaust hood 300 is provided with an indoor air outlet 301, and an exhaust pipe 310 is mounted on the exhaust hood 300 to form an outdoor air outlet 302. The embodiment of the present application provides sufficient space for setting the indoor air outlet 301 and the outdoor air outlet 302 by setting the exhaust hood 300, and the exhaust hood 300 forms an exhaust chamber, which is sufficient in space and facilitates gas exhaust.

[0050] In combination Figure 1 , in the embodiment of the present application, two indoor air outlets 301 are arranged on the two sides of the exhaust pipe 310, which facilitates increasing the area of the indoor air outlet 301 and improving the balance and exhaust efficiency of indoor air exhaust.

[0051] Optionally, the exhaust pipe 310 is mounted on the top of the exhaust hood 300 to facilitate connection to the outdoor, and the indoor air outlet 301 is arranged on the top of the exhaust hood 300 to facilitate direct exhaust to the indoor without the need for additional pipes, which facilitates simplifying the structure.

[0052] In order to control the opening and closing of the outdoor air outlet 302, in the embodiment of the present application, a control valve 311 is mounted in the exhaust pipe 310, which is configured to control the opening or closing of the outdoor air outlet 302. As shown in Figure 3 and Figure 4 , the control valve 311 is opened to open the outdoor air outlet 302; as shown in Figure 5 and Figure 6 , the control valve 311 is closed to close the outdoor air outlet 302. The control valve 311 can be a switch valve, a regulating valve, etc., which is not limited herein. Of course, the way of controlling the opening and closing of the outdoor air outlet 302 is not limited to this, for example, an electric control door is arranged at the outdoor air outlet 302.

[0053] In order to control the opening and closing of the indoor air outlet 301, an electric control door 320 is mounted on the indoor air outlet 301, which is configured to control the opening or closing of the indoor air outlet 301. As shown in Figure 3 and Figure 4 , the electric control door 320 is configured to close the indoor air outlet 301; as shown in Figure 5 and Figure 6As shown, the electrically controlled door 320 is configured to open the indoor air outlet 302. Exemplarily, the electrically controlled door 320 is hinged to the top of the exhaust hood 300 at one side thereof facing the exhaust duct 310, so that the electrically controlled door 320 can be turned upward relative to the exhaust hood 300; and an electromagnetic lock is arranged between the side of the electrically controlled door 320 facing away from the exhaust duct 310 and the edge of the indoor air outlet 301, for controlling the opening and closing of the electrically controlled door 320. When the electromagnetic lock is closed, the electrically controlled door 320 covers the indoor air outlet 301; when the electromagnetic lock is opened, the control valve 311 is closed, and under the action of the air pressure in the exhaust hood 300, the electrically controlled door 320 is pushed open to open the indoor air outlet 301. Generally, in order to ensure sufficient exhaust volume, the electrically controlled door 320 is usually provided with a motor which drives the electrically controlled door 320 to open; of course, the electrically controlled door 320 can also be manually opened to ensure the exhaust volume.

[0054] Of course, the manner of controlling the opening and closing of the indoor air outlet 301 is not limited thereto, for example, a control valve, a hydraulically driven switch door, etc. can be installed at the indoor air outlet 301.

[0055] With reference to Figure 1 and Figure 2 , the side of the exhaust hood 300 is provided with an adjusting air outlet 303, for example, the adjusting air outlet 303 is arranged at the front side of the exhaust hood 300; and the top edge of the adjusting air outlet 303 is hinged with an adjusting door 330, so that the adjusting door 330 can be turned relative to the exhaust hood 300 to open or close the adjusting air outlet 303.

[0056] The adjusting door 330 is configured to open toward the inside of the exhaust hood 300 under the action of the pressure in the exhaust hood 300, to supplement air toward the inside of the exhaust hood 300. Exemplarily, when the exhaust air speed in the exhaust duct 310 is large, negative pressure occurs in the exhaust hood 300, and under the action of the pressure in the exhaust hood 300, the adjusting door 330 opens toward the inside of the exhaust hood 300, thereby supplementing air toward the inside of the exhaust hood 300, to benefit the balance and stability of the pressure in the biological safety cabinet.

[0057] The adjusting door 330 is configured to open toward the outside of the exhaust hood 300 under the action of the pressure in the exhaust hood 300, to exhaust the gas in the exhaust hood 300. Exemplarily, when the exhaust air speed of the indoor air outlet 301 is large, high pressure occurs in the exhaust hood 300, and under the action of the high pressure in the exhaust hood 300, the adjusting door 330 opens toward the outside of the exhaust hood 300, so that the gas in the exhaust hood 300 is exhausted, to play a role of auxiliary exhaust, to benefit the balance and stability of the pressure in the biological safety cabinet.

[0058] The above description is an embodiment of the application, which sets the exhaust hood 300 on the top of the cabinet 100 to achieve exhaust. However, the exhaust mode of the biological safety cabinet of the application is not limited to the above embodiment. The outside of the installation port 104 is provided with two exhaust pipes, one of which forms the indoor air outlet 301 for exhausting air to the indoor, and the other exhaust pipe forms the outdoor air outlet 302 for exhausting air to the outdoor.

[0059] Figure 7 is a front view of the biological safety cabinet provided in Embodiment Two of the application;

[0060] Figure 8 is a side view of the biological safety cabinet provided in Embodiment Two of the application. In some possible implementation manners, as shown in Figure 7 and Figure 8 , the top of the cabinet 100 is provided with the installation port 104 which is in communication with the first back air duct 121. The installation port 104 forms the indoor air outlet 301, that is, the air in the first back air duct 121 is directly exhausted via the installation port 104 to achieve indoor exhaust. The installation port 104 is optionally provided with an exhaust pipe which forms the outdoor air outlet, so that the first end of the first back air duct 121 is in communication with the outdoor air outlet, thereby achieving outdoor exhaust.

[0061] Figure 7 and Figure 8 , the biological safety cabinet shown in Figure 1 and Figure 2 , the difference between the biological safety cabinet shown in Figure 1 and Figure 2 , the biological safety cabinet shown in Figure 7 and Figure 8 , the biological safety cabinet shown in

[0062] The above describes the exhaust structure of the biological safety cabinet of the application, and the specific structure of the air duct in the biological safety cabinet in the application is described below.

[0063] In combination with Figure 1 and Figure 2 , the cabinet 100 of the application forms the air supply air chamber 113 on the top of the working area 101. The air supply air chamber 113 is provided with the air supply port 103 on the side wall facing the working area 101. In the application, the air supply port 103 is arranged on the bottom wall of the air supply air chamber 113. The back side wall of the air supply air chamber 113 is provided with the communication port 105.

[0064] The back of the cabinet body 100 forms a second back air duct 111, and the bottom of the cabinet body 100 forms a second bottom air duct 112, which is communicated with the air inlet 102 and the second back air duct 111, and the second back air duct 111 is communicated with the air supply cavity 113 through the communication air port 105; in this way, the second bottom air duct 112, the second back air duct 111 and the air supply cavity 113 form the circulating air duct 110.

[0065] The cabinet body 100 of the embodiment of the present application forms the air supply cavity 113 at the top of the working area 101, and supplies air to the working area 101, which is beneficial to form the sinking air flow.

[0066] In combination with Figure 2 , the second bottom air duct 112 is located outside the first bottom air duct 122, and the second back air duct 111 is located outside the first back air duct 121, so that part of the circulating air duct 110 is located outside the exhaust air duct 120, which is beneficial to simplify the air duct structure. Moreover, the circulating air duct 110 can provide protection for the exhaust air duct 120, and in the case of leakage, the exhaust air duct 120 enters the circulating air duct 110 for filtration and circulation, and will not directly leak into the room, which is safer.

[0067] Continuing to refer to Figure 1 and Figure 2 , at least part of the first back air duct 121 is communicated with the indoor air outlet 301 or the outdoor air outlet 302 through the air supply cavity 113, and in the embodiment of the present application, part of the first back air duct 121 at the top passes through the air supply cavity 113 and is located in the middle of the air supply cavity 113. The communication air port 105 is provided with two, and the two communication air ports 105 are respectively located on the two sides of the first back air duct 121, which can not only improve the area of the communication air port 105, but also is beneficial to improve the uniformity of air entering the air supply cavity 113 in the second back air duct 111.

[0068] Optionally, the air supply fan 520 is located in the middle of the air supply cavity 113, and the air supply fan 520 is opposite to the first back air duct 121, so that the air supply fan 520 and the communication air port 105 are staggered with each other, which is beneficial to the uniformity of air supplied by the air supply cavity 113 into the working area 101.

[0069] Continuing to refer to Figure 1 and Figure 2 , the cabinet body 100 of the embodiment of the present application comprises a bottom plate structure, a back plate structure, a top plate 160, a front cover 170 and two side plates 180. The two side plates 180 are respectively installed on the left and right sides of the bottom plate structure, the top plate 160 is opposite to the bottom plate structure and is installed on the top of the two side plates 180, the back plate structure is installed on the back of the two side plates 180, and the front cover 170 is installed on the upper part of the front side of the two side plates 180, and the lower part of the front cover 170 forms a front window.

[0070] The bottom plate structure comprises an outer bottom plate 131, a middle bottom plate 132, a front end plate 133, a first connecting plate 134 and a second connecting plate 135. The first workbench 210, the middle bottom plate 132 and the outer bottom plate 131 are arranged in parallel, and the two sides of the first workbench 210, the middle bottom plate 132 and the outer bottom plate 131 are connected with the two side plates 180 respectively. The middle bottom plate 132 is located between the outer bottom plate 131 and the first workbench 210, and there is a gap between the middle bottom plate 132 and the first workbench 210 to form the first bottom air duct 122, and there is a gap between the middle bottom plate 132 and the outer bottom plate 131 to form the second bottom air duct 112.

[0071] The front end plate 133 is fixed to the front end of the outer bottom plate 131 and located above the outer bottom plate 131. The top end of the front end plate 133 is communicated with the first connecting plate 134. The first connecting plate 134 can be arranged horizontally and located at the rear side of the front end plate 133. The rear end of the first connecting plate 134 is connected with the middle bottom plate 132 through the second connecting plate 135. The second connecting plate 135 is also communicated with the front end of the first workbench 210 to close the front end of the first bottom air duct 122.

[0072] The air inlet 102 is arranged on the first connecting plate 134, which not only allows the circulating gas in the working area to enter the second bottom air duct 112, but also allows the indoor air to enter the second bottom air duct 112 through the air inlet 102.

[0073] The back plate structure comprises an outer back plate 141, a middle back plate 142 and an inner back plate 143, which are arranged in parallel. The middle back plate 142 and the outer back plate 141 of the embodiment have a gap therebetween to form the first back air duct 121, and the middle back plate 142 and the inner back plate 143 have a gap therebetween to form the second back air duct 111.

[0074] The bottom end of the outer back plate 141 is connected with the outer bottom plate 131, and the top end of the outer back plate 141 is bent towards the middle back plate 142 and connected with the top of the middle back plate 142. The bottom end of the middle back plate 142 is connected with the middle bottom plate 132, and the top end of the middle back plate 142 is connected with the top plate 160. The bottom end of the inner back plate 143 is connected with the first workbench 210, and the top end of the inner back plate 143 is connected with the bottom end of the partition plate 150. The top end of the partition plate 150 is connected with the top plate 160. The partition plate 150 can be the bent structure shown in the figure, or can be an inclined plate, so that a mounting space is formed between the partition plate 150 and the middle back plate 142 to mount the exhaust fan 420 and the exhaust filter 410.

[0075] The biosafety cabinet further includes a supply filter 510 and a supply fan 520. The supply filter 510 is installed at the supply port 103 and is configured to filter the gas entering the working area 101. The supply fan 520 is located at a side of the supply filter 510 away from the supply port 103 and is configured to provide power for the gas entering the working area 101. Optionally, the supply fan 520 can be provided in multiple numbers, for example, two. The multiple supply fans 520 are arranged in a horizontal direction (corresponding to the X-axis direction in the figure) to improve the supply efficiency and uniformity of the supply.

[0076] In summary, the biosafety cabinet includes a cabinet 100, a first workbench 210, and two second workbenches 220. The cabinet 100 encloses a working area 101 with an open front side. The cabinet 100 is provided with an air inlet 102 below the front side of the working area 101 to suck in the gas. The cabinet 100 is provided with a supply port 103 at the top of the working area 101 to supply the gas into the working area 101. The cabinet 100 is provided with an indoor air outlet 301 and an outdoor air outlet 302 at the top. The indoor air outlet 301 is configured to discharge the air to the indoor environment, and the outdoor air outlet 302 is configured to discharge the air to the outdoor environment.

[0077] A circulating air duct 110 is formed in the cabinet 100 and is in communication with the air inlet 102 and the supply port 103. In this way, the gas sucked in by the air inlet 102 is returned to the working area 101 again via the circulating air duct 110 and the supply port 103.

[0078] A first back air duct 121 is formed in the cabinet 100 and is located at the back of the cabinet 100. The first end of the first back air duct 121 is in communication with the indoor air outlet 301 and the outdoor air outlet 302. When the indoor air outlet 301 is configured to be open, the outdoor air outlet 302 is configured to be closed, and the gas in the first back air duct 121 is discharged via the indoor air outlet 301. When the indoor air outlet 301 is configured to be closed, the outdoor air outlet 302 is configured to be open, and the gas in the first back air duct 121 is discharged via the outdoor air outlet 302.

[0079] The gas in the working area 101 corresponding to the second workbench 220 enters the circulating air duct 110 via the air inlet 102 and enters the working area 101 again via the supply port 103, and is recycled, which is conducive to reducing power consumption. The gas in the working area 101 corresponding to the first workbench 210 enters the exhaust air duct 120 via the air inlet, and is discharged via the indoor air outlet 301 or the outdoor air outlet 302. When the air is discharged via the outdoor air outlet 302, it is suitable for experiments on harmful chemical gases and chemical volatile gases. Figure 5 and Figure 6When air is discharged from the indoor air outlet 301, the cleanliness of the air in the area of the first workbench 210 is improved, and the biosafety cabinet is suitable for standard microbiological experiments and the like. The biosafety cabinet of the embodiment of the application has low power consumption, is suitable for experiments with different requirements, has a wide range of applications, and solves the problems of large installation space and high cost caused by arranging multiple biosafety cabinets.

[0080] So far, the technical solutions of the application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the 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 application, and the technical solutions after the changes or replacements will all fall within the protection scope of the application.

Claims

1. A biological safety cabinet, characterized by, The application relates to a biosafety cabinet. The cabinet body, a first workbench and two second workbenches; The cabinet body forms a work area with an open front side, and an air inlet is arranged below the front side of the work area, an air outlet is arranged on the top of the work area, and indoor and outdoor air outlets are arranged on the top of the cabinet body; when the indoor air outlet is configured to be opened, the outdoor air outlet is configured to be closed; when the indoor air outlet is configured to be closed, the outdoor air outlet is configured to be opened; A circulating air duct is formed in the cabinet body, and the circulating air duct is communicated with the air inlet and the air outlet; A first back air duct is formed in the cabinet body, and the first end of the first back air duct is communicated with the indoor air outlet and the outdoor air outlet respectively; The first workbench and the two second workbenches are horizontally arranged in the cabinet body, and the two second workbenches are arranged on the two sides of the first workbench; a first bottom air duct is formed between the first workbench and the cabinet body; an air suction port is arranged on the first workbench and communicated with the first bottom air duct; the first bottom air duct and the second end of the first back air duct are communicated to form an exhaust air duct; The air in the work area corresponding to the second workbench enters the circulating air duct through the air inlet and reenters the work area through the air outlet; the air in the work area corresponding to the first workbench enters the exhaust air duct through the air suction port and is exhausted through the indoor air outlet or the outdoor air outlet; An installation port communicated with the first back air duct is arranged on the top of the cabinet body, and an exhaust filter and an exhaust fan are arranged on the inner side of the installation port; The biosafety cabinet further comprises a supply air filter, which is arranged on the air outlet and used for filtering the air entering the work area; An exhaust cover is arranged on the outer side of the installation port; the exhaust cover is provided with an indoor air outlet; an exhaust pipe is arranged on the exhaust cover, and the exhaust pipe forms the outdoor air outlet; An adjusting air port is arranged on the side of the exhaust cover, and an adjusting air door is hinged to the top edge of the adjusting air port; The adjusting air door is configured to be opened towards the inner side of the exhaust cover under the action of the pressure in the exhaust cover to supplement the air in the exhaust cover; or the adjusting air door is configured to be opened towards the outer side of the exhaust cover under the action of the pressure in the exhaust cover to exhaust the air in the exhaust cover.

2. The biological safety cabinet of claim 1, wherein, A control valve is arranged in the exhaust pipe, and the control valve is configured to control the opening or closing of the outdoor air outlet; An electric control door is arranged on the indoor air outlet, and the electric control door is configured to control the opening or closing of the indoor air outlet.

3. The biological safety cabinet of claim 1, wherein, Two indoor air outlets are arranged on the biosafety cabinet.

4. The biological safety cabinet according to any one of claims 1-3, wherein, The first workbench is rectangular, and the four side edges of the first workbench are respectively provided with the air suction ports; The air inlet is arranged on the front side of the air suction port of the front side edge of the first workbench.

5. The biological safety cabinet according to any one of claims 1-3, wherein, The cabinet body forms a supply air cavity on the top of the working area, the supply air cavity is provided with the supply air outlet on the side wall of the working area, and the rear wall of the supply air cavity is provided with a communication air outlet; The back of the cabinet body forms a second back air duct, the bottom of the cabinet body forms a second bottom air duct, the second bottom air duct is communicated with the air inlet and the second back air duct, and the second back air duct is communicated with the supply air cavity through the communication air outlet; The second bottom air duct, the second back air duct and the supply air cavity form the circulating air duct.

6. The biological safety cabinet of claim 5, wherein, The second bottom air duct is located outside the first bottom air duct, and the second back air duct is located outside the first back air duct.

7. The biological safety cabinet of claim 6, wherein, At least part of the first back air duct is communicated with the indoor air outlet or the outdoor air outlet through the supply air cavity; The communication air outlet is provided with two, and the two communication air outlets are respectively located on the two sides of the first back air duct.

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