Biological safety cabinet system

Abstract

The application belongs to the technical field of experimental equipment, and particularly relates to a biological safety cabinet system. The application aims to solve the problem that the instability of pressure in the existing laboratory affects the experiment in the biological safety cabinet. When the biological safety cabinet system is in the first mode, part of the gas in the safety cabinet body is discharged to the room through the exhaust device, and the other part circulates in the safety cabinet body; the air supply device is configured to be closed; when the system is in the third mode, part of the gas in the safety cabinet body is discharged to the outside through the exhaust device, and the other part circulates in the safety cabinet body; when the system is in the second mode, the gas in the safety cabinet body is discharged to the outside through the exhaust device. In the third mode and the second mode, the air supply device is configured to be started to make the air pressure in the room meet the preset pressure. Through the above setting, the air supply device and the exhaust device are linked to meet the indoor pressure requirement, and the air supply device and the exhaust device have no time difference in action, which is beneficial to improving the stability of the indoor pressure in the laboratory.

Description

TECHNICAL FIELD

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

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

[0003] The biological safety cabinet is installed in the laboratory, and the laboratory usually has a pressure requirement. For example, in order to prevent the dispersion of pollutants, the laboratory requires negative pressure; for another example, some experiments require the laboratory to have positive pressure. Therefore, the linkage operation of the exhaust system and the air supply device of the biological safety cabinet is very important.

[0004] In the related art, the air supply device of the laboratory adjusts the power of the air supply fan according to the pressure in the laboratory, so as to adjust the pressure in the laboratory. The exhaust device of the biological safety cabinet exhausts air to the outside of the laboratory in some working modes. There is a time difference between the action time of the air supply device and the action time of the exhaust device, which causes the pressure in the laboratory to be unstable and affects the experiment in the biological safety cabinet. SUMMARY

[0005] In order to solve the above problems in the prior art, that is, to solve the problem that the pressure in the existing laboratory is unstable and affects the experiment in the biological safety cabinet.

[0006] The application provides a biological safety cabinet system, which comprises a safety cabinet body, an exhaust device and an air supply device. The working modes of the biological safety cabinet system include a first mode, a second mode and a third mode. When the biological safety cabinet system is in the first mode, part of the gas in the safety cabinet body is exhausted to the indoor through the exhaust device, and the other part of the gas in the safety cabinet body circulates in the safety cabinet body. The air supply device is configured to be closed. When the biological safety cabinet system is in the third mode, part of the gas in the safety cabinet body is exhausted to the outdoor through the exhaust device, and the other part of the gas in the safety cabinet body circulates in the safety cabinet body. When the biological safety cabinet system is in the second mode, the gas in the safety cabinet body is exhausted to the outdoor through the exhaust device. When the biological safety cabinet system is in the third mode or the second mode, the air supply device is configured to be in a starting state, so that the air pressure in the room meets the preset pressure.

[0007] In the optional technical solution of the above-mentioned biosafety cabinet system, the air supply device comprises an air supply fan and an air supply air duct, the air supply fan is arranged in the air supply air duct, and two ends of the air supply air duct are located in the indoor and outdoor respectively; the air supply air duct is provided with a switch piece, the switch piece has a first opening position and a second opening position; when the biosafety cabinet system is in the first mode, the air supply fan and the switch piece are configured to be closed; when the biosafety cabinet system is in the third mode or the second mode, the air supply fan and the switch piece are configured to be opened, and when in the third mode, the switch piece is in the first opening position; when in the second mode, the switch piece is in the second opening position.

[0008] In the optional technical solution of the above-mentioned biosafety cabinet system, the switch piece is a regulating valve.

[0009] In the optional technical solution of the above-mentioned biosafety cabinet system, the air supply air duct comprises a total air duct, a first sub-air duct and a second sub-air duct, a first section of the total air duct is communicated with the first sub-air duct and the second sub-air duct respectively, and a second end of the total air duct extends to the outdoor; one end of the first sub-air duct and the second sub-air duct away from the total air duct is located in the indoor; the air supply fan is installed in the total air duct; the switch piece comprises a first regulating valve and a second regulating valve, the first regulating valve is installed in the first sub-air duct, and the second regulating valve is installed in the second sub-air duct; when the biosafety cabinet system is in the first mode, the first regulating valve and the second regulating valve are configured to be closed; when the biosafety cabinet system is in the third mode, the first regulating valve is configured to be opened, and the second regulating valve is configured to be closed; when the biosafety cabinet system is in the second mode, the first regulating valve is configured to be closed, and the second regulating valve is configured to be opened.

[0010] In the optional technical solution of the above-mentioned biosafety cabinet system, the first regulating valve and the second regulating valve are both regulating valves.

[0011] In the optional technical solution of the above-mentioned biosafety cabinet system, the first regulating valve comprises a first constant air valve and a first electric air valve; the second regulating valve comprises a second constant air valve and a second electric air valve, and the air volume of the second constant air valve is greater than that of the first constant air valve; when the biosafety cabinet system is in the first mode, the first electric air valve and the second electric air valve are configured to be closed; when the biosafety cabinet system is in the third mode, the first electric air valve is configured to be opened, and the second electric air valve is configured to be closed; when the biosafety cabinet system is in the second mode, the first electric air valve is configured to be closed, and the second electric air valve is configured to be opened.

[0012] In the optional technical solutions of the above biosafety cabinet system, the preset pressure is negative pressure, and when the biosafety cabinet system is in the third mode or the second mode, the air supply device is configured to be started after the air exhaust device is in a started state; the preset pressure is positive pressure, and when the biosafety cabinet system is in the third mode or the second mode, the air exhaust device is configured to be started after the air supply device is in a started state.

[0013] In the optional technical solutions of the above biosafety cabinet system, the safety cabinet body encloses a work area with an open front side, the safety cabinet body is provided with a bottom air inlet below the front side of the work area, and the safety cabinet body is provided with an air supply port at the top of the work area; the top of the safety cabinet body is provided with a top air inlet and an air outlet; a first air duct and a second air duct are formed in the safety cabinet body, two ends of the first air duct are in communication with the bottom air inlet and the air outlet respectively, and two ends of the second air duct are in communication with the top air inlet and the air supply port respectively; a communication port is arranged between the first air duct and the second air duct; a first fan is installed at one end of the second air duct close to the air supply port, and a second fan is installed at one end of the first air duct close to the air outlet; when the biosafety cabinet system is started, the first fan and the second fan are configured to be started; when the biosafety cabinet system is in the first mode or the third mode, the communication port is configured to be opened, and the top air inlet is configured to be closed, so that part of the gas sucked by the bottom air inlet is blown to the work area through the first air duct, the second air duct and the air supply port, and another part of the gas sucked by the bottom air inlet is discharged through the first air duct and the air outlet; when the biosafety cabinet system is in the second mode, the communication port is configured to be closed, and the top air inlet is configured to be opened, so that the gas sucked by the bottom air inlet is discharged through the first air duct and the air outlet, and the gas sucked by the top air inlet is blown to the work area through the second air duct and the air supply port.

[0014] In the optional technical solutions of the above biosafety cabinet system, a first control valve is arranged in the communication port, and the first control valve is configured to open or close the communication port to connect or separate the first air duct and the second air duct; a second control valve is installed at the top air inlet, and the second control valve is configured to control the opening or closing of the top air inlet; when the biosafety cabinet system is in the first mode and the third mode, the first control valve is configured to be opened, and the second control valve is configured to be closed; when the biosafety cabinet system is in the second mode, the first control valve is configured to be closed, and the second control valve is configured to be closed.

[0015] In the optional technical solution of the biosafety cabinet system, the exhaust device comprises an indoor exhaust pipe, an outdoor exhaust pipe and the second fan, the indoor exhaust pipe and the outdoor exhaust pipe are respectively communicated with the air outlet; the outdoor exhaust pipe is provided with an outdoor exhaust fan; when the biosafety cabinet system is in the first mode, the indoor exhaust pipe is configured to be opened, and the outdoor exhaust pipe is configured to be closed; when the biosafety cabinet system is in the third mode and the second mode, the indoor exhaust pipe is configured to be closed, the outdoor exhaust pipe is configured to be opened, and the outdoor exhaust fan is configured to be started.

[0016] In the optional technical solution of the biosafety cabinet system, the outdoor exhaust pipe is provided with a third control valve configured to control the opening or closing of the outdoor exhaust pipe; the indoor exhaust pipe is provided with a fourth control valve configured to control the opening or closing of the indoor exhaust pipe; when the biosafety cabinet system is in the first mode, the fourth control valve is configured to be opened, and the third control valve is configured to be closed; when the biosafety cabinet system is in the third mode and the second mode, the fourth control valve is configured to be closed, and the third control valve is configured to be opened.

[0017] It can be understood by those skilled in the art that the biosafety cabinet system of the embodiment of the present application comprises a safety cabinet body, an exhaust device and an air supply device, wherein the working mode of the biosafety cabinet system comprises a first mode, a second mode and a third mode. When the biosafety cabinet system is in the first mode, part of the gas in the safety cabinet body is discharged to the indoor through the exhaust device, and the other part of the gas in the safety cabinet body circulates in the safety cabinet body; the air supply device is configured to be closed; when the biosafety cabinet system is in the third mode, part of the gas in the safety cabinet body is discharged to the outdoor through the exhaust device, and the other part of the gas in the safety cabinet body circulates in the safety cabinet body, and the air supply device is configured to be started to make the indoor air pressure meet the preset pressure; when the biosafety cabinet system is in the second mode, the gas in the safety cabinet body is discharged to the outdoor through the exhaust device, and the air supply device is configured to be started to make the indoor air pressure meet the preset pressure. Through the above setting, the air supply device and the exhaust device are linked to meet the indoor pressure requirement, and the air supply device and the exhaust device have no time difference in action, which is beneficial to improve the stability of the indoor pressure and avoid the influence of unstable pressure on the experiment in the safety cabinet body. BRIEF DESCRIPTION OF DRAWINGS

[0018] The optional embodiments of the biosafety cabinet system of the present application will be described below with reference to the accompanying drawings. The drawings are as follows:

[0019] Figure 1 is a schematic diagram of the biosafety cabinet system provided by the embodiment of the present application;

[0020] Figure 2 is a schematic structural diagram of a safety cabinet body and an exhaust device provided by an embodiment of the present application;

[0021] Figure 3 is a schematic structural diagram of a safety cabinet body and an exhaust device provided by an embodiment of the present application;

[0022] Figure 4 is a schematic structural diagram of a safety cabinet body and an exhaust device provided by an embodiment of the present application;

[0023] Figure 5 is a front view of a safety cabinet body and an exhaust device provided by an embodiment of the present application;

[0024] Figure 6 is Figure 5 is a sectional view along A-A in FIG. 8;

[0025] Figure 7 is a schematic diagram of gas flow in a second mode of a safety cabinet body and an exhaust device provided by an embodiment of the present application;

[0026] Figure 8 is a schematic diagram of gas flow in a first mode of a safety cabinet body and an exhaust device provided by an embodiment of the present application;

[0027] Figure 9 is a schematic diagram of gas flow in a third mode of a safety cabinet body and an exhaust device provided by an embodiment of the present application;

[0028] Figure 10 is a schematic structural diagram of an exhaust joint of a biological safety cabinet system provided by an embodiment of the present application.

[0029] In the drawings: 10: safety cabinet body; 20: exhaust device; 30: air supply device; 31: air supply fan; 32: air supply air duct; 321: main air duct; 322: first sub-air duct; 323: second sub-air duct; 33: switch piece; 331: first control valve; 3311: first quantitative air valve; 3312: first electric air valve; 332: second control valve; 3321: second quantitative air valve; 3322: second electric air valve; 40: laboratory; 100: cabinet body; 101: working area; 102: bottom air inlet; 103: air supply port; 104: top air inlet; 105: air outlet; 110: first air duct; 111: second fan; 112: exhaust filter; 113: bottom air duct; 114: back air duct; 120: second air duct; 121: first fan; 122: air supply filter; 130: shell; 131: outer side plate; 132: bottom plate; 133: top plate; 134: front cover; 135: glass door; 136: water pan; 140: workbench; 150: inner side plate; 160: partition plate; 161: communication port; 210: first control valve; 220: second control valve; 230: third control valve; 240: fourth control valve; 300: outdoor exhaust pipe; 310: outdoor exhaust fan; 400: indoor exhaust pipe; 500: exhaust connector; 501: first interface; 502: second interface; 503: third interface; 510: exhaust cover; 520: pipe body; 600: support leg. DETAILED DESCRIPTION

[0030] First, those skilled in the art should understand that the embodiments are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can adjust them as needed in order to adapt to specific application occasions.

[0031] Secondly, it should be noted that in the description of the embodiments of the present application, the terms indicating the direction or positional relationship of the terms "in", "out" and the like are based on the direction or positional 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.

[0032] 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 members. 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.

[0033] A biological safety cabinet is designed to protect the operator, the laboratory environment and the experimental materials from the infectious aerosols and splashes that may be generated during the operation of infectious experimental materials such as primary cultures, virus strains and diagnostic specimens.

[0034] The biological safety cabinet is installed in a laboratory, which usually has a pressure requirement, for example, a negative pressure is required in the laboratory in order to prevent the dispersion of pollutants; for another example, a positive pressure is required in the laboratory for some experiments. Therefore, the linkage operation of the exhaust system and the air supply device of the biological safety cabinet is crucial.

[0035] In the related art, the air supply device of the laboratory adjusts the power of the air supply fan according to the pressure in the laboratory, so as to adjust the pressure in the laboratory. The exhaust device of the biological safety cabinet exhausts air outside the laboratory in some working modes; there is a time difference between the action time of the air supply device and the action time of the exhaust device, which causes the pressure in the laboratory to be unstable and affects the experiment in the biological safety cabinet.

[0036] Therefore, the biological safety cabinet system provided in the embodiments of the present application has a working mode including a first mode, a second mode and a third mode, in the second mode and the third mode, the gas in the safety cabinet body is exhausted through the exhaust device; at this time, the air supply device is configured to be started, so that the other indoor space meets the preset pressure. The biological safety cabinet system provided in the embodiments of the present application links the air supply device and the exhaust device to meet the indoor pressure requirement, and the air supply device and the exhaust device have no time difference in action, which is beneficial to improve the stability of the pressure in the laboratory and avoid the influence of unstable pressure on the experiment in the safety cabinet body.

[0037] The optional technical solutions of the biological safety cabinet system provided in the embodiments of the present application will be described below in combination with the drawings.

[0038] 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 safety cabinet body after installation. The orientation word "front" refers to the side of the safety cabinet body where the front window is arranged, and the operator is located on the side of the front window on the workbench to perform experimental operation; the orientation words "back" and "back" indicate the side away from the front window; the orientation word "top" indicates the side away from the ground; the orientation word "bottom" indicates the side towards the ground. The Z-axis indicates the vertical direction.

[0039] Figure 1 is a schematic diagram of the biological safety cabinet system provided in the embodiments of the present application.

[0040] In combination with Figure 1The biosafety cabinet system of the embodiment of the present application comprises a safety cabinet body 10, an exhaust device 20 and an air supply device 30. The safety cabinet body 10 forms a working area inside, which is used for experimental operation. The exhaust device 20 is used for exhausting the gas in the safety cabinet body 10, and the air supply device 30 is used for supplying air into the laboratory 40. The safety cabinet body 10 is installed inside the laboratory 40.

[0041] The working mode of the biosafety cabinet system of the embodiment of the present application comprises a first mode, a second mode and a third mode.

[0042] When the biosafety cabinet system is in the first mode, part of the gas in the safety cabinet body 10 is exhausted to the indoor through the exhaust device 20, and the other part of the gas in the safety cabinet body 10 is circulated in the safety cabinet body 10. The air supply device 30 is configured to be closed. In this working mode, since the exhaust device 20 does not exhaust air to the outside of the laboratory 40, the air supply device 30 is not started. It should be noted that when part of the gas in the safety cabinet body 10 is circulated in the safety cabinet body 10, a filter device is arranged inside to filter the gas. The specific structure is described in the specific structure of the safety cabinet body 10 later.

[0043] When the biosafety cabinet system is in the third mode, part of the gas in the safety cabinet body 10 is exhausted to the outdoor through the exhaust device 20, and the other part of the gas in the safety cabinet body 10 is circulated in the safety cabinet body 10. The air supply device 30 is configured to be started to make the air pressure in the laboratory 40 meet the preset pressure. The difference between the third mode and the first mode is that in the third mode, part of the gas in the safety cabinet body 10 is exhausted to the outdoor under the action of the exhaust device 20, while in the first mode, part of the gas in the safety cabinet body 10 is exhausted to the indoor under the action of the exhaust device 20. In this mode, part of the gas in the safety cabinet body 10 is exhausted to the outdoor under the action of the exhaust device 20, and correspondingly, the air supply device 30 is configured to be started to supply air into the laboratory 40, so that the air pressure in the laboratory 40 meets the preset pressure.

[0044] When the biosafety cabinet system is in the second mode, the gas in the safety cabinet body 10 is exhausted to the outdoor through the exhaust device 20, and the air supply device is configured to be started to make the air pressure in the laboratory 40 meet the preset pressure. In this mode, all the gas in the safety cabinet body 10 is exhausted to the outside of the laboratory 40 under the action of the exhaust device 20, and at this time, the air supply device 30 is configured to be started. It can be understood that in the second mode, the air supply amount of the air supply device 30 is greater than that in the third mode.

[0045] Optionally, when the preset pressure is negative pressure and the biosafety cabinet system is in the third mode or the second mode, the air supply device 30 is configured to be started after the air exhaust device 20 is in the started state. It can be understood that when the pressure in the laboratory 40 is required to be lower than the normal pressure, the air exhaust device 20 is started first, and then the air supply device 30 is started, so as to ensure the negative pressure state in the laboratory 40.

[0046] Optionally, when the preset pressure is positive pressure and the biosafety cabinet system is in the third mode or the second mode, the air exhaust device 20 is configured to be started after the air supply device 30 is in the started state. It can be understood that when the pressure in the laboratory 40 is required to be higher than the normal pressure, the air supply device 30 is started first, and then the air exhaust device 20 is started, so as to ensure the positive pressure state in the laboratory 40.

[0047] When the preset pressure is the normal pressure, the starting sequence of the air exhaust device 20 and the air supply device 30 is not limited.

[0048] The biosafety cabinet system of the embodiment of the present application has the air supply device 30 and the air exhaust device 20 linked together, which are started or closed according to the working mode of the safety cabinet body 10. In this way, the starting and closing of the air supply device 30 are timely responsive, which is beneficial to improve the stability of the pressure in the laboratory, so as to ensure the constant pressure in the laboratory.

[0049] Continuing to refer to Figure 1 The air supply device 30 of the embodiment of the present application comprises an air supply fan 31 and an air supply air duct 32, the air supply fan 31 is arranged in the air supply air duct 32, both ends of the air supply air duct 32 are located in the indoor and outdoor respectively, and the air supply fan 31 can transport the air outside the laboratory 40 to the laboratory 40 through the air supply air duct 32.

[0050] The air supply air duct 32 is provided with a switching piece 33, the switching piece 33 has a first opening position and a second opening position, the air supply fan 31 has a first air supply amount when the switching piece 33 is in the first opening position, and the air supply fan 31 has a second air supply amount when the switching piece 33 is in the second opening position.

[0051] When the biosafety cabinet system of the embodiment of the present application is in the first mode, the air supply fan 31 and the switching piece 33 are both configured to be closed.

[0052] When the biosafety cabinet system is in the third mode and the second mode, the air supply fan 31 and the switching piece 33 are both configured to be opened, and in the third mode, the switching piece 33 is in the first opening position; in the second mode, the switching piece 33 is in the second opening position. The second air supply amount of the air supply fan 31 is greater than the first air supply amount.

[0053] In some embodiments, the switch piece 33 is a regulating valve, which can be an existing electromagnetic regulating valve with adjustable opening size. The regulating valve is configured to adjust the working state according to the working mode of the biosafety cabinet system. The working state of the regulating valve includes a closed state, a first open position, and a second open position. When the biosafety cabinet system is in the first mode, the regulating valve is in the closed state; when the biosafety cabinet system is in the third mode, the regulating valve is in the first open position, and the air supply fan 31 has a first air supply amount; when the biosafety cabinet system is in the second mode, the regulating valve is in the second open position, and the air supply fan 31 has a second air supply amount, which is greater than the first air supply amount.

[0054] In other embodiments, the air supply air duct 32 includes a total air duct 321, a first sub-air duct 322, and a second sub-air duct 323. The total air duct 321 has opposite first and second ends. The first end of the total air duct 321 is in communication with the first and second sub-air ducts 322 and 323, respectively. The second end of the total air duct 321 extends to the outside. The ends of the first and second sub-air ducts 322 and 323 away from the total air duct 321 are located indoors.

[0055] The air supply fan 31 is installed in the total air duct 321.

[0056] The switch piece 33 of the present embodiment includes a first regulating valve 331 and a second regulating valve 332. The first regulating valve 331 is installed in the first sub-air duct 322 and is configured to control the on-off of the first sub-air duct 322. When the first regulating valve 331 is open, the first sub-air duct 322 is open; when the first regulating valve 331 is closed, the first sub-air duct 322 is blocked. The second regulating valve 332 is installed in the second sub-air duct 323 and is configured to control the on-off of the second sub-air duct 323. When the second regulating valve 332 is open, the second sub-air duct 323 is open; when the second regulating valve 332 is closed, the second sub-air duct 323 is blocked.

[0057] When the biosafety cabinet system is in the first mode, the first and second regulating valves 331 and 332 are configured to be closed.

[0058] When the biosafety cabinet system is in the third mode, the first regulating valve 331 is configured to be open, and the second regulating valve 332 is configured to be closed, and the air supply device 30 has a first air supply amount.

[0059] When the biosafety cabinet system is in the second mode, the first regulating valve 331 is configured to be closed, and the second regulating valve 332 is configured to be open, and the air supply device 30 has a second air supply amount.

[0060] In some possible implementation manners, the first regulating valve 331 and the second regulating valve 332 are both regulating valves, and the regulating valve is an electromagnetic valve with adjustable opening size, which is convenient to control. The air supply amount of the air supply device 30 is changed by adjusting the first regulating valve 331 and the second regulating valve 332.

[0061] In some possible implementation manners, the first regulating valve 331 and the second regulating valve 332 are both regulating valves, and the regulating valve is an electromagnetic valve with adjustable opening size, which is convenient to control. The air supply amount of the air supply device 30 is changed by adjusting the first regulating valve 331 and the second regulating valve 332.

[0062] The second regulating valve 332 includes a second constant air volume valve 3321 and a second electric air valve 3322, and the air volume of the second constant air volume valve 3321 is greater than that of the first constant air volume valve 3311.

[0063] The constant air volume valve is a mechanical self-acting device, which is suitable for a ventilation system requiring constant air volume. The air volume control of the constant air volume valve does not require external power, and the constant air volume valve relies on the airflow in the pipeline to position and control the valve position, so as to maintain the airflow at a pre-set flow rate in the entire pressure difference range. For example, the first constant air volume valve 3311 has an air volume of 600 m3 / h, and the second constant air volume valve 3321 has an air volume of 1800 m3 / h.

[0064] The electric air valve is a valve used in a gas pipeline, which is used for adjusting the flow rate or cutting off the gas medium.

[0065] When the biosafety cabinet system is in the first mode, the first electric air valve 3312 and the second electric air valve 3322 are both configured to be closed.

[0066] When the biosafety cabinet system is in the third mode, the first electric air valve 3312 is configured to be opened, and the second electric air valve 3322 is configured to be closed, and the first constant air volume valve 3311 is opened under the action of the airflow.

[0067] When the biosafety cabinet system is in the second mode, the first electric air valve 3312 is configured to be closed, and the second electric air valve 3322 is configured to be opened, and the second constant air volume valve 3321 is opened under the action of the airflow.

[0068] The embodiment of the present application uses two constant air volume valves and two electric air valves to control the air volume of the air supply device 30, so that the air supply air volume meets the air supply air volume requirement of the biosafety cabinet system in different modes, and the structure is simple and the control logic is simple.

[0069] The structure and functions of the safety cabinet body 10 of the embodiment of the present application will be described below with reference to the accompanying drawings.

[0070] Figure 2 is a schematic structural diagram of the safety cabinet body and the air exhaust device provided by the embodiment of the present application.

[0071] Referring toFigure 2 The safety cabinet body of the embodiment of the application comprises a cabinet body 100 and supporting legs 600. An air duct is formed in the cabinet body 100 to guide the gas to blow to the working area 101 or to be discharged to the outside of the cabinet body 100. The supporting legs 600 are used to support the cabinet body 100. Four supporting legs 600 can be provided and are respectively fixed at the four top corners of the bottom of the cabinet body 100. Universal wheels can be further provided at the bottom ends of the supporting legs 600 to facilitate the movement of the safety cabinet body.

[0072] The cabinet body 100 of the embodiment of the application encloses the working area 101 with a front opening. The front opening of the cabinet body 100 is the front window of the safety cabinet body, and the operator operates in the working area 101 through the front window. The bottom air inlet 102 is provided at the bottom of the front side of the cabinet body 100 to suck in the gas. The air supply opening 103 is provided at the top of the cabinet body 100 to supply the gas into the working area 101. The top air inlet 104 is provided at the top of the cabinet body 100 to suck in the indoor gas, and the air outlet 105 is provided to discharge the gas.

[0073] The first air duct 110 and the second air duct 120 are formed in the cabinet body 100. The communication port 161 is provided between the first air duct 110 and the second air duct 120 to make the first air duct 110 and the second air duct 120 communicate through the communication port 161. The two ends of the first air duct 110 are respectively communicated with the bottom air inlet 102 and the air outlet 105. In this way, the gas in the working area 101 enters the first air duct 110 through the bottom air inlet 102 and is discharged through the air outlet 105. The two ends of the second air duct 120 are respectively communicated with the top air inlet 104 and the air supply opening 103. In this way, the gas sucked in by the top air inlet 104 enters the second air duct 120 and is supplied into the working area 101 through the air supply opening 103.

[0074] Again in combination Figure 2 The first air duct 110 and the second air duct 120 are formed in the cabinet body 100. The communication port 161 is provided between the first air duct 110 and the second air duct 120 to make the first air duct 110 and the second air duct 120 communicate through the communication port 161. The two ends of the first air duct 110 are respectively communicated with the bottom air inlet 102 and the air outlet 105. In this way, the gas in the working area 101 enters the first air duct 110 through the bottom air inlet 102 and is discharged through the air outlet 105. The two ends of the second air duct 120 are respectively communicated with the top air inlet 104 and the air supply opening 103. In this way, the gas sucked in by the top air inlet 104 enters the second air duct 120 and is supplied into the working area 101 through the air supply opening 103.

[0075] The first air duct 110 is provided with a second fan 111 at one end close to the air outlet 105. The second fan 111 provides power for the gas exhaust, especially when the exhaust is to the indoor exhaust duct 400. The second fan 111 is provided with an exhaust filter 112 between the second fan 111 and the air outlet 105, which is used to filter the exhaust gas. The second fan 111 is configured to be started when the safety cabinet body is in use, that is, the second fan 111 is started when the biosafety cabinet system is in various modes.

[0076] Optionally, the second fan 111 can not be started when the biosafety cabinet system is in the second mode and the third mode, and only the external exhaust fan 310 is used to provide the exhaust power. When the biosafety cabinet system is in the first mode, the second fan 111 must be started to avoid the indoor gas from flowing back into the safety cabinet body through the air outlet 105.

[0077] In some possible implementations, the first air duct 110 includes a bottom air duct 113 and a back air duct 114 connected in communication. The bottom air duct 113 is located at the bottom of the working area 101, and the back air duct 114 is located at the back of the working area 101. The front end of the bottom air duct 113 is in communication with the bottom air inlet 102, and the back air duct 114 is in communication with the air outlet 105, so as to guide the gas entering from the front side to the top. The second air duct 120 is located at the top of the working area 101, and the second air duct 120 is located at the front side of the back air duct 114, so as to facilitate the formation of a downward air flow and blow to the working area 101. Through the above arrangement, the first air duct 110 and the second air duct 120 in the cabinet body 100 are compact in structure.

[0078] The structure of the safety cabinet body and the exhaust device provided in the embodiments of the present application will be described below in combination with Figures 3 to 6 , wherein Figure 3 is a structure diagram of the safety cabinet body and the exhaust device provided in the embodiments of the present application; Figure 4 is an explosion diagram of the safety cabinet body and the exhaust device provided in the embodiments of the present application; Figure 5 is a front view of the safety cabinet body and the exhaust device provided in the embodiments of the present application; Figure 6 is Figure 5 is an A-A sectional view in

[0079] In combination with Figure 3 and Figure 4 , the cabinet body 100 in the embodiments of the present application includes an outer shell 130, a workbench 140, an inner side plate 150, and a partition plate 160.

[0080] In combination with Figure 5 and Figure 6The shell 130 comprises a front open outer side panel 131, a bottom plate 132, a top plate 133 and a front cover 134. The outer side panel 131 comprises a back side panel and two side panels arranged on both sides of the back side panel. The bottom plate 132 and the top plate 133 are respectively fixed to the bottom end and the top end of the outer side panel 131. The front cover 134 is fixed above the front side of the outer side panel 131. The front cover 134 is provided with control components such as an operation panel. A glass door 135 is arranged below the front cover 134. The glass door 135 can slide along the length direction of the two side edges of the outer side panel 131 to open or close the front window. The top air inlet 104 and the air outlet 105 are arranged on the top plate 133 to facilitate air suction and air exhaust. The bottom air inlet 102 is arranged on the bottom plate 132, for example, on the front side of the bottom plate 132.

[0081] The workbench 140, the inner side panel 150 and the partition plate 160 are all arranged inside the shell 130. The workbench 140 and the inner side panel 150 form the working area 101. The workbench 140 and the bottom plate 132 are spaced to form the bottom air duct 113. A water tray 136 is arranged between the workbench 140 and the bottom plate 132 to collect condensed water and the like.

[0082] The inner side panel 150 comprises a back side panel and two side panels arranged on both sides of the back side panel. The back side panel of the inner side panel 150 is spaced from the back side panel of the outer side panel 131 to form part of the back air duct 114.

[0083] The partition plate 160 is fixed between the inner side panel 150 and the top plate 133. The partition plate 160 is fixedly connected to the top end of the inner side panel 150 and the top plate 133. The partition plate 160 is spaced from the back side panel of the outer side panel 131 to form part of the back air duct 114. The partition plate 160 is spaced from the front cover 134 to form the second air duct 120. A communication port 161 for communicating the first air duct 110 and the second air duct 120 is arranged on the partition plate 160. The shape of the partition plate 160 is not limited in the embodiment of the present application, as long as the second air duct 120 and the back air duct 114 have sufficient space to install the fan and the filter.

[0084] Therefore, the back air duct 114 of the embodiment of the present application comprises the space between the partition plate 160 and the outer side panel 131 and the space between the inner side panel 150 and the outer side panel 131.

[0085] It should be noted that the structure of the cabinet 100 is not limited to the above structure, as long as the air duct structure in the embodiment of the present application can be formed.

[0086] The above description is only an example of the embodiment of the present application. The specific implementation can be further diversified. Figure 7 and the drawings Figure 8The flow direction of the gas in the above-mentioned air duct structure in the safety cabinet body and the exhaust device of the embodiments of the present application is described. Wherein, Figure 7 is a schematic diagram of the gas flow direction of the second mode of the safety cabinet body and the exhaust device provided by the embodiments of the present application;

[0087] Figure 8 is a schematic diagram of the gas flow direction of the first mode of the safety cabinet body and the exhaust device provided by the embodiments of the present application. In the figure, the a arrow has no filling, representing clean gas; the b arrow has filling, representing contaminated gas.

[0088] When the biosafety cabinet system is in the first mode or the third mode, the communication port 161 is configured to be opened, so that the first air duct 110 and the second air duct 120 are communicated. The top air inlet 104 is configured to be closed, so that the part of the gas sucked by the bottom air inlet 102 enters the second air duct 120 via the first air duct 110 and the communication port 161, the gas in the second air duct 120 is blown to the working area 101 via the air supply port 103, and the other part of the gas sucked by the bottom air inlet 102 is discharged via the first air duct 110 and the air outlet 105. In the first mode, the air of the air outlet 105 is discharged to the indoor via the exhaust device 20; in the third mode, the air of the air outlet 105 is discharged to the outdoor via the exhaust device 20.

[0089] When the biosafety cabinet system is in the second mode, the communication port 161 is configured to be closed, and the top air inlet 104 is configured to be opened, so that the gas sucked by the bottom air inlet 102 is discharged via the first air duct 110 and the air outlet 105, and discharged to the outdoor via the exhaust device 20; the gas sucked by the top air inlet 104 is blown to the working area 101 via the second air duct 120 and the air supply port 103.

[0090] In the embodiments of the present application, the first control valve 210 is installed in the communication port 161. The first control valve 210 is configured to be opened or closed, so that the first air duct 110 and the second air duct 120 are communicated or separated. When the first control valve 210 is configured to be opened, the first air duct 110 and the second air duct 120 are communicated, and the air in the second air duct 120 can enter the first air duct 110; when the first control valve 210 is configured to be closed, the first air duct 110 and the second air duct 120 are separated.

[0091] The second control valve 220 is installed at the top air inlet 104, and the second control valve 220 is configured to control the opening or closing of the top air inlet 104. When the second control valve 220 is opened, the top air inlet 104 is opened, and the indoor air can enter the second air duct 120 via the top air inlet 104; when the second control valve 220 is closed, the top air inlet 104 is closed.

[0092] It is understandable that the first control valve 210 and the second control valve 220 can be interpreted in a broad sense as valves that can control the opening and closing of pipelines, such as on / off valves and gate valves, or control switches such as electrically controlled doors that can control the opening and closing of pipelines.

[0093] like Figure 7 As shown, when the first control valve 210 is configured to isolate the first air duct 110 and the second air duct 120, and the second control valve 220 is configured to open the top air inlet 104, the gas drawn in by the bottom air inlet 102 is discharged through the first air duct 110 and the air outlet 105, and the gas drawn in by the top air inlet 104 is blown towards the work area 101 through the second air duct 120 and the air outlet 103. At this time, the biosafety cabinet system is in the second mode, and all the gas in the work area 101 is discharged through the first air duct 110; it can be applied to microbial experiments in which volatile toxic chemicals and radioactive elements are used as auxiliary agents.

[0094] like Figure 8 As shown, when the first control valve 210 is configured to connect the first air duct 110 and the second air duct 120, and the second control valve 220 is configured to close the top air inlet 104, a portion of the gas drawn in by the bottom air inlet 102 enters the second air duct 120 via the first air duct 110 and the connecting port 161. The gas in the second air duct 120 is blown towards the working area 101 via the air outlet 103, and the remaining portion of the gas drawn in by the bottom air inlet 102 is discharged via the first air duct 110 and the air outlet 105. At this time, the biosafety cabinet system is in the first mode, where 30% of the gas in the working area 101 is discharged via the air outlet 105, and 70% of the gas re-enters the working area 101 via the first air duct 110, the connecting port 161, the second air duct 120, and the air outlet 103, which can be applied to standard microbiological experiments, etc.

[0095] Therefore, the biosafety cabinet system of this application embodiment forms different gas flow directions within the cabinet body, thereby forming different types of biosafety cabinets to suit different experimental requirements and improve the application range of biosafety cabinets; the laboratory does not need to be equipped with two devices, which helps to reduce the installation space occupied and reduce costs.

[0096] Continue to refer to Figure 8 and Figure 9 The ventilation device 20 of this application embodiment includes an indoor exhaust duct 400, an outdoor exhaust duct 300, and the aforementioned second fan 111. Both the indoor exhaust duct 400 and the outdoor exhaust duct 300 are connected to the air outlet 105. The indoor exhaust duct 400 is used to lead the gas discharged from the air outlet 105 into the room. To provide power for gas exhaust, an outdoor exhaust fan 310 is installed inside the outdoor exhaust duct 300.

[0097] When the biosafety cabinet system is in the first mode, the indoor exhaust pipe 400 is configured to be opened, and the outdoor exhaust pipe 300 is configured to be closed; at this time, under the action of the second fan 111, the air in the air outlet 105 is discharged to the indoor via the indoor exhaust pipe 400.

[0098] When the biosafety cabinet system is in the third mode and the second mode, the indoor exhaust pipe 400 is configured to be closed, the outdoor exhaust pipe 300 is configured to be opened, and the outdoor exhaust fan 310 is configured to be started. Under the action of the outdoor exhaust fan 310, the air in the air outlet 105 is discharged to the outdoor via the outdoor exhaust pipe 300.

[0099] In order to realize the on-off control of the outdoor exhaust pipe 300 and the indoor exhaust pipe 400, the third control valve 230 is installed in the outdoor exhaust pipe 300, and the fourth control valve 240 is installed in the indoor exhaust pipe 400.

[0100] The third control valve 230 is configured to control the opening or closing of the outdoor exhaust pipe 300. When the third control valve 230 is opened, the outdoor exhaust pipe 300 is opened; when the third control valve 230 is closed, the outdoor exhaust pipe 300 is closed. The fourth control valve 240 is configured to control the opening or closing of the indoor exhaust pipe 400. When the fourth control valve 240 is configured to be opened, the indoor exhaust pipe 400 is configured to be opened; when the fourth control valve 240 is configured to be closed, the indoor exhaust pipe 400 is configured to be closed.

[0101] It can be understood that the third control valve 230 and the fourth control valve 240 are understood in a broad sense, which can be a valve capable of controlling the on-off of the pipe, such as a switch valve, a gate valve, etc., or a control switch capable of controlling the on-off of the pipe.

[0102] When the biosafety cabinet system is in the first mode, continue to refer to Figure 8 , the first control valve 210 is configured to be opened to make the first air duct 110 and the second air duct 120 communicate; and the second control valve 220 is configured to be closed to close the top air inlet 104; the third control valve 230 is configured to be closed to close the outdoor exhaust pipe 300; the fourth control valve 240 is configured to open the indoor exhaust pipe 400, the outdoor exhaust fan 310 is configured to be closed, and the first fan 121 and the second fan 111 are configured to be started. In this way, the gas in the working area 101 enters the first air duct 110, part of the gas in the first air duct 110, for example, 70% of the gas, enters the second air duct 120 via the communication port 161, and enters the working area 101 again via the air supply port 103; part of the gas in the first air duct 110, for example, 30% of the gas, enters the indoor exhaust pipe 400 via the air outlet 105, and is discharged to the indoor via the indoor exhaust pipe 400. This mode can be applied to standard microbiological experiments, etc.

[0103] When the biosafety cabinet system is in the second mode, the first control valve 210 is configured to be closed to isolate the first air duct 110 and the second air duct 120; the second control valve 220 is configured to open the top air inlet 104, the third control valve 230 is configured to open the outdoor exhaust pipe 300, and the fourth control valve 240 is configured to close the indoor exhaust pipe 400. In this way, the gas in the working area 101 is discharged to the outdoor through the first air duct 110, the air outlet 105, and the outdoor exhaust pipe 300, avoiding the contamination of indoor air by radioactive substances or volatile substances. This mode can be applied to microbial experiments in which volatile toxic chemicals and radioactive nuclear elements are used as auxiliary agents. In this process, the outdoor exhaust fan 310 is configured to be started to improve the exhaust efficiency and avoid outdoor air from flowing back into the safety cabinet body.

[0104] When the biosafety cabinet system is in the third mode, referring to Figure 9 , Figure 9 is a schematic diagram of the gas flow in the third mode of the safety cabinet body and the exhaust device provided in the embodiments of the present application. When the first control valve 210 is configured to be opened to make the first air duct 110 and the second air duct 120 communicate, and the second control valve 220 is configured to close the top air inlet 104, the third control valve 230 is configured to open the outdoor exhaust pipe 300, the fourth control valve 240 is configured to close the indoor exhaust pipe 400, and the outdoor exhaust fan 310 is configured to be opened, so that part of the gas in the first air duct 110 is discharged to the outdoor through the air outlet 105 and the outdoor exhaust pipe 300. This is the third mode, which can be applied to microbial experiments in which trace amounts of volatile toxic chemicals and trace amounts of radioactive nuclear elements are used as auxiliary agents.

[0105] Compared with the second mode, the third mode has low power consumption and is more energy-saving. In the third mode, the gas in the working area 101 enters the first air duct 110, 70% of the gas in the first air duct 110 enters the second air duct 120 through the communication port 161, and then enters the working area 101 again through the air supply port 103; 30% of the gas in the first air duct 110 enters the outdoor exhaust pipe 300 through the air outlet 105 and is discharged to the outdoor through the outdoor exhaust pipe 300.

[0106] Figure 10 is a structural schematic diagram of the exhaust connector of the safety cabinet body and the exhaust device provided in the embodiments of the present application, in combination with Figure 2 and Figure 10 The safety cabinet body of the embodiments of the present application further includes an exhaust connector 500, which provides installation space for the indoor exhaust pipe 400 and the outdoor exhaust pipe 300.

[0107] The air exhaust joint 500 of the embodiment has a first interface 501, a second interface 502 and a third interface 503. The first interface 501 is in communication with the air outlet 105. The second interface 502 is in communication with the outdoor air exhaust pipe 300. The third interface 503 is in communication with the indoor air exhaust pipe 400.

[0108] The air exhaust joint 500 of the embodiment includes an air exhaust cover 510 and a pipe body 520. The air exhaust cover 510 is in the form of a rectangular cover with an open bottom. The open bottom is the first interface 501. The air exhaust cover 510 is sealingly installed on the top plate 133 of the cabinet 100. The bottom end of the pipe body 520 is fixed to the top of the air exhaust cover 510. The top of the pipe body 520 forms the second interface 502 and the third interface 503. The opening direction of the second interface 502 is along the vertical direction, facilitating the connection of the outdoor air exhaust pipe 300. The opening direction of the third interface 503 is perpendicular to the opening direction of the second interface 502, facilitating the connection and arrangement of the pipes. Figure 4

[0109] Thus, in the embodiment, the operation mode of the biosafety cabinet system can have three modes. The switching states of the control valves and the motor are shown in Table 1.

[0110] Table 1

[0111] Mode Valve 1 Valve 2 Valve 3 Valve 4 First fan Second fan Outside fan First mode On Off Off On Run Run Off Second mode Off On On Off Run Run Run Third mode On Off On Off Run Run Run

[0112] Finally, it should be noted that the air supply device can be operated at any time point during the switching process of the above three modes. After the air supply device works for a period of time, the air pressure in the laboratory can be maintained at the preset pressure.

[0113] ​In summary, the biosafety cabinet system of the embodiment of the application comprises a safety cabinet body 10, an exhaust device 20 and an air supply device 30, wherein the working modes of the biosafety cabinet system comprise a first mode, a second mode and a third mode. When the biosafety cabinet system is in the first mode, part of the gas in the safety cabinet body 10 is exhausted to the indoor through the exhaust device 20, and the other part of the gas in the safety cabinet body 10 circulates in the safety cabinet body 10; the air supply device 30 is configured to be closed; when the biosafety cabinet system is in the third mode, part of the gas in the safety cabinet body 10 is exhausted to the outdoor through the exhaust device 20, and the other part of the gas in the safety cabinet body 10 circulates in the safety cabinet body 10; the air supply device 30 is configured to be started to make the air pressure in the indoor meet the preset pressure; when the biosafety cabinet system is in the second mode, the gas in the safety cabinet body 10 is exhausted to the outdoor through the exhaust device 20, and the air supply device 30 is configured to be started to make the air pressure in the indoor meet the preset pressure. Through the above setting, the air supply device and the exhaust device are linked to meet the indoor pressure requirement, and the air supply device and the exhaust device have no time difference in action, which is beneficial to improve the stability of the indoor pressure in the laboratory and avoid the influence of the unstable pressure on the experiment in the safety cabinet body.

[0114] So far, the technical solution of the application has 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 fall within the protection scope of the application.

Claims

1. A biological safety cabinet system, characterized by, The safety cabinet body, the exhaust device, and the air supply device; The working mode of the biological safety cabinet system includes a first mode, a second mode, and a third mode; When the biological safety cabinet system is in the first mode, part of the gas in the safety cabinet body is exhausted to the room via the exhaust device, and another part of the gas in the safety cabinet body circulates in the safety cabinet body; the air supply device is configured to be closed; When the biological safety cabinet system is in the third mode, part of the gas in the safety cabinet body is exhausted to the outside via the exhaust device, and another part of the gas in the safety cabinet body circulates in the safety cabinet body; When the biological safety cabinet system is in the second mode, the gas in the safety cabinet body is exhausted to the outside via the exhaust device; When the biological safety cabinet system is in the third mode or the second mode, the air supply device is configured to be in a starting state to make the air pressure in the room meet a preset pressure; The air supply device includes an air supply fan and an air supply air duct, the air supply fan is arranged in the air supply air duct, and two ends of the air supply air duct are located in the room and the outside, respectively; the air supply air duct is provided with a switching piece, and the switching piece has a first opening position and a second opening position; When the biological safety cabinet system is in the first mode, the air supply fan and the switching piece are configured to be closed; When the biological safety cabinet system is in the third mode or the second mode, the air supply fan and the switching piece are configured to be opened, and in the third mode, the switching piece is in the first opening position; in the second mode, the switching piece is in the second opening position; The air supply air duct includes a total air duct, a first sub-air duct, and a second sub-air duct, a first section of the total air duct is in communication with the first sub-air duct and the second sub-air duct, respectively, and a second end of the total air duct extends to the outside; one end of the first sub-air duct and the second sub-air duct, which is away from the total air duct, is located in the room; The air supply fan is installed in the total air duct; The switching piece includes a first control valve and a second control valve, the first control valve is installed in the first sub-air duct, and the second control valve is installed in the second sub-air duct; When the biological safety cabinet system is in the first mode, the first control valve and the second control valve are configured to be closed; When the biological safety cabinet system is in the third mode, the first control valve is configured to be opened, and the second control valve is configured to be closed; When the biological safety cabinet system is in the second mode, the first control valve is configured to be closed, and the second control valve is configured to be opened; The air supply device is linked with the exhaust device, and the air supply device is started or closed according to the working mode of the safety cabinet body. The first control valve includes a first quantitative air valve and a first electric air valve; 2. The biological safety cabinet system of claim 1, wherein, The second control valve includes a second quantitative air valve and a second electric air valve, and the air volume of the second quantitative air valve is greater than that of the first quantitative air valve; ​ The first electric air valve and the second electric air valve are configured to be closed when the biosafety cabinet system is in the first mode; The first electric air valve is configured to be opened and the second electric air valve is configured to be closed when the biosafety cabinet system is in the third mode; The first electric air valve is configured to be closed and the second electric air valve is configured to be opened when the biosafety cabinet system is in the second mode.

3. The biological safety cabinet system of any of claims 1-2, wherein, The air supply device is configured to be started after the air exhaust device is started when the biosafety cabinet system is in the third mode or the second mode, and the preset pressure is negative pressure. The air exhaust device is configured to be started after the air supply device is started when the biosafety cabinet system is in the third mode and the second mode, and the preset pressure is positive pressure.

4. The biological safety cabinet system of any of claims 1-2, wherein, The safety cabinet body encloses a work area with a front opening, and a bottom air inlet is arranged below the front side of the work area of the safety cabinet body, and an air supply port is arranged at the top of the work area of the safety cabinet body; a top air inlet and an air outlet are arranged at the top of the safety cabinet body; A first air duct and a second air duct are formed in the safety cabinet body, and the two ends of the first air duct are respectively communicated with the bottom air inlet and the air outlet; the two ends of the second air duct are respectively communicated with the top air inlet and the air supply port; a communication port is arranged between the first air duct and the second air duct; A first fan is installed at one end of the second air duct close to the air supply port, and a second fan is installed at one end of the first air duct close to the air outlet; the first fan and the second fan are configured to be started when the biosafety cabinet system is started; The communication port is configured to be opened and the top air inlet is configured to be closed when the biosafety cabinet system is in the first mode or the third mode, so that part of the gas sucked by the bottom air inlet is blown to the work area through the first air duct, the second air duct and the air supply port, and another part of the gas sucked by the bottom air inlet is discharged through the first air duct and the air outlet; The communication port is configured to be closed and the top air inlet is configured to be opened when the biosafety cabinet system is in the second mode, so that the gas sucked by the bottom air inlet is discharged through the first air duct and the air outlet, and the gas sucked by the top air inlet is blown to the work area through the second air duct and the air supply port.

5. The biological safety cabinet system of claim 4, wherein, A first control valve is arranged in the communication port, and the first control valve is configured to open or close the communication port to connect or separate the first air duct and the second air duct; A second control valve is installed at the top air inlet, and the second control valve is configured to control the opening or closing of the top air inlet; The first control valve is configured to be opened and the second control valve is configured to be closed when the biosafety cabinet system is in the first mode and the third mode; The first control valve is configured to be closed and the second control valve is configured to be closed when the biosafety cabinet system is in the second mode.

6. The biological safety cabinet system of claim 4, wherein, The air exhaust device comprises an indoor air exhaust pipe, an outdoor air exhaust pipe and the second fan, the indoor air exhaust pipe and the outdoor air exhaust pipe are respectively communicated with the air outlet; the outdoor air exhaust pipe is provided with an outdoor air exhaust fan; When the biosafety cabinet system is in the first mode, the indoor air exhaust pipe is configured to be opened, and the outdoor air exhaust pipe is configured to be closed; When the biosafety cabinet system is in the third mode and the second mode, the indoor air exhaust pipe is configured to be closed, the outdoor air exhaust pipe is configured to be opened, and the outdoor air exhaust fan is configured to be started.

Images