Biological safety cabinet and control method for biological safety cabinet

Abstract

This application relates to the field of biosafety cabinet technology, and discloses a biosafety cabinet including an exhaust box, an exhaust filter, a first exhaust fan, a second exhaust fan, a first check valve, and a second check valve. The exhaust box includes a first air inlet connected to the first exhaust fan, a second air inlet connected to the second exhaust fan, and an air outlet equipped with an exhaust filter. The first check valve is installed at the first air inlet; the second check valve is installed at the second air inlet. When the first exhaust fan is working normally, under the airflow of the first exhaust fan, the first check valve opens and the second check valve closes, and the second exhaust fan shuts down. When the first exhaust fan is in a faulty state, the first check valve closes, the second exhaust fan starts, and the second check valve opens. This disclosure allows the second exhaust fan to operate after the first exhaust fan fails, enabling gas to be discharged through the exhaust filter to prevent airflow leakage from the work area. This application also discloses a control method for a biosafety cabinet.

Description

Technical Field

[0001] This application relates to the field of biosafety cabinet technology, and for example to a biosafety cabinet and a control method for a biosafety cabinet. Background Technology

[0002] To ensure that the exhaust air is non-toxic, biosafety cabinets are equipped with filters at the exhaust vents. However, when the exhaust fan malfunctions, the pressure at the exhaust vents may be insufficient to ensure that all the exhaust air passes through the filters before being discharged. This can cause airflow to overflow from the work area, posing a safety hazard.

[0003] While there are now biosafety cabinets that use dual fans, most of them operate with both fans running simultaneously. Although this can reduce the risk of airflow overflow from the work area due to fan failure, the operation of dual fans results in higher energy consumption.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0006] This disclosure provides a biosafety cabinet and a control method for the biosafety cabinet to solve the technical problem that airflow overflow in the work area is easily caused by the failure of the exhaust fan of the biosafety cabinet, and can reduce the energy consumption of dual-fan operation.

[0007] In some embodiments, the biosafety cabinet includes an exhaust box, an exhaust filter, a first exhaust fan, a second exhaust fan, a first check valve, and a second check valve. The exhaust box includes a first air inlet, a second air inlet, and an air outlet; the exhaust filter is installed at the air outlet. The first exhaust fan is connected to the first air inlet; the second exhaust fan is connected to the second air inlet; the first check valve is installed at the first air inlet to allow airflow from the first exhaust fan into the exhaust box; the second check valve is installed at the second air inlet to allow airflow from the second exhaust fan into the exhaust box. When the first exhaust fan is working normally, under the action of the airflow from the first exhaust fan, the first check valve opens and the second check valve closes, the second exhaust fan closes, and the airflow inside the biosafety cabinet enters the exhaust box through the first air inlet and exits through the air outlet under the action of the first exhaust fan. When the first exhaust fan is in a faulty state, the first check valve closes, the second exhaust fan starts, the second check valve opens, and the airflow enters the exhaust box through the second air inlet and exits through the air outlet under the action of the second exhaust fan.

[0008] In some embodiments, the control method for a biosafety cabinet is applied to the biosafety cabinet described above. The control method includes acquiring the opening and closing state of the cabinet door; controlling the operation of a first exhaust fan when the cabinet door is open, causing a first check valve to open and a second check valve to close under the action of the airflow from the first exhaust fan; acquiring the opening and closing state of the first check valve; and controlling the operation state of the second exhaust fan according to the opening and closing state of the first check valve.

[0009] The biosafety cabinet and control method for the biosafety cabinet provided in this disclosure can achieve the following technical effects:

[0010] This invention features dual exhaust fans and dual check valves, with the first check valve's conduction direction aligned with the airflow direction of the first exhaust fan, and the second check valve's conduction direction aligned with the airflow direction of the second exhaust fan. This allows the second exhaust fan to serve as a backup exhaust fan, activated when the first exhaust fan fails.

[0011] When the first exhaust fan is operating, the first check valve opens under air pressure, while the second exhaust fan and the second check valve close. Airflow, driven by the first exhaust fan, enters the exhaust box through the first inlet and exits through the outlet. When the biosafety cabinet door is open and the first exhaust fan is malfunctioning, it cannot generate negative pressure to allow air to enter the exhaust box. The first check valve automatically closes, the second exhaust fan starts, and the second check valve opens. Airflow, driven by the second exhaust fan, enters the exhaust box through the second inlet and exits through the outlet.

[0012] In this way, if the first exhaust fan fails, the second exhaust fan can ensure that the exhaust airflow from the safety cabinet flows normally and can be discharged through the exhaust filter to prevent airflow from overflowing from the work area.

[0013] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0014] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0015] Figure 1 This is a schematic diagram of a biosafety cabinet provided in an embodiment of this disclosure;

[0016] Figure 2 This is the biosafety cabinet provided in this embodiment when the first exhaust fan is working normally;

[0017] Figure 3This is the biosafety cabinet provided in this embodiment for use in case of a first-row fan failure;

[0018] Figure 4 This is a schematic diagram of the structure of the touch unit provided in the embodiments of this disclosure;

[0019] Figure 5 This is a schematic diagram of the control system of the biosafety cabinet provided in the embodiments of this disclosure;

[0020] Figure 6 This is a schematic diagram of a control method for a biosafety cabinet provided in an embodiment of this disclosure;

[0021] Figure 7 This is a schematic diagram of a control device for a biosafety cabinet provided in an embodiment of this disclosure;

[0022] Figure 8 This is a schematic diagram of another control device for a biosafety cabinet provided in an embodiment of this disclosure.

[0023] 10: Exhaust box; 11: First exhaust fan; 12: Second exhaust fan; 13: First check valve; 14: Second check valve; 15: Trigger unit; 151: Trigger element; 152: Trigger switch; 16: Exhaust filter;

[0024] 20: Air supply box; 21: Air supply fan; 22: Air supply filter;

[0025] 30: First control mechanism;

[0026] 40: Second control mechanism;

[0027] 50: Cabinet door opening / closing detection mechanism;

[0028] 60: Warning agency;

[0029] 70: Monitoring module; 80: First control unit; 90: Second control unit;

[0030] 100: Processor; 101: Memory; 102: Communication interface; 103: Bus. Detailed Implementation

[0031] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0032] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0033] Unless otherwise stated, the term "multiple" means two or more.

[0034] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0035] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0036] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0037] The fault state of the first exhaust fan described in this disclosure refers to the state in which the first exhaust fan, after being started, is unable to properly drive airflow into the exhaust box 10.

[0038] Combination Figures 1 to 5 As shown in the figure, this embodiment of the present disclosure provides a biosafety cabinet, including an exhaust box 10, an exhaust filter 16, a first exhaust fan 11, a second exhaust fan 12, a first check valve 13, and a second check valve 14.

[0039] The exhaust box 10 includes a first air inlet, a second air inlet, and an air outlet.

[0040] The exhaust filter 16 is installed at the air outlet.

[0041] The first exhaust fan 11 is connected to the first air inlet; the second exhaust fan 12 is connected to the second air inlet. The first check valve 13 is installed at the first air inlet to allow airflow from the first exhaust fan 11 into the exhaust box 10; the second check valve 14 is installed at the second air inlet to allow airflow from the second exhaust fan 12 into the exhaust box 10.

[0042] When the first exhaust fan 11 is working normally, under the action of the airflow from the first exhaust fan 11, the first check valve 13 opens and the second check valve 14 closes, the second exhaust fan 12 closes, and the airflow in the biosafety cabinet enters the exhaust box 10 through the first air inlet and flows out through the air outlet under the action of the first exhaust fan 11; when the first exhaust fan 11 is in a faulty state, the first check valve 13 closes, the second exhaust fan 12 opens, the second check valve 14 opens, and the airflow enters the exhaust box 10 through the second air inlet and flows out through the air outlet under the action of the second exhaust fan 12.

[0043] Understandably, this disclosure uses dual exhaust fans and dual check valves, with the first check valve 13 operating in the same direction as the airflow of the first exhaust fan 11, and the second check valve 14 operating in the same direction as the airflow of the second exhaust fan 12. This allows the second exhaust fan 12 to serve as a backup exhaust fan, activated when the first exhaust fan 11 fails. When the first exhaust fan 11 is operating, the first check valve 13 opens under air pressure, while the second exhaust fan 12 and the second check valve 14 close. Airflow from the first exhaust fan 11 enters the exhaust box 10 through the first inlet and exits through the outlet. When the first exhaust fan 11 fails, it cannot allow air to enter the exhaust box 10. The first check valve 13 automatically closes, the second exhaust fan 12 opens, and the second check valve 14 opens. Airflow from the second exhaust fan 12 enters the exhaust box 10 through the second inlet and exits through the outlet.

[0044] Using the exhaust box 10 for biosafety cabinets disclosed herein, after the first exhaust fan 11 fails, the second exhaust fan 12 can be turned on to allow the exhaust airflow from the biosafety cabinet to be discharged through the exhaust filter 16, thereby preventing airflow from overflowing from the work area.

[0045] Optionally, the first air inlet is located at the first end of the exhaust box 10, the second air inlet is located at the second end of the exhaust box 10, and the air outlet is located at the top of the exhaust box 10.

[0046] It is understandable that the first check valve 13 and the second check valve 14 are arranged opposite to each other, and the conduction directions of the two check valves are opposite. This can form an interlocking design between the combination of the first exhaust fan 11 and the first check valve 13 and the combination of the second exhaust fan 12 and the second check valve 14. This can ensure that the exhaust box 10 always maintains positive pressure when either exhaust fan is running, and gas can be discharged from the exhaust filter 16, ensuring that the airflow in the working area does not overflow.

[0047] Optionally, the first check valve 13 and the second check valve 14 divide the exhaust box 10 into a first air inlet section, a purified exhaust section and a second air inlet section in sequence, wherein the exhaust filter 16 is disposed at the upper part of the purified exhaust section.

[0048] Understandably, when the first exhaust fan is turned on, the airflow enters the purification exhaust section from the first air inlet section, enters the exhaust filter 16, is filtered, and is then discharged; when the second exhaust section is turned on, the airflow enters the purification exhaust section from the second air inlet section, enters the exhaust filter 16, is filtered, and is then discharged.

[0049] Optionally, the exhaust box 10 also includes a second control mechanism 40, which is connected to the cabinet door opening / closing detection mechanism 50 and the first exhaust fan 11. The second control mechanism 40 is configured to control the first exhaust fan 11 to operate when the cabinet door is in the open state.

[0050] Understandably, when the cabinet door is open, the first exhaust fan 11 runs automatically, which drives the first check valve 13 to open, so that airflow can be discharged from the exhaust filter 16 and the airflow in the working area will not overflow.

[0051] Optionally, the exhaust box 10 also includes a cabinet door opening / closing detection mechanism 50, an alarm mechanism 60, and a first control mechanism 30. The cabinet door opening / closing detection mechanism 50 is used to detect the opening and closing status of the cabinet door; the alarm mechanism 60 is used to issue an alarm signal when the first exhaust fan 11 malfunctions; the first control mechanism 30 is connected to the first check valve 13, the cabinet door opening / closing detection mechanism 50, the alarm mechanism 60, and the second exhaust fan 12. The control mechanism is configured such that when the first check valve 13 is open, the first control mechanism 30 controls the second exhaust fan 12 to de-energize; when the cabinet door is open and the first check valve 13 is closed, the first control mechanism 30 controls the second exhaust fan 12 to run and the alarm mechanism 60 issues an alarm signal.

[0052] Understandably, when the first exhaust fan 11 is operating normally, it generates airflow, which causes the first check valve 13 to open. This disclosure utilizes the coordination between the first check valve 13 and the first exhaust fan 11 to determine the state of the first exhaust fan 11. That is, when the cabinet door is open, the first exhaust fan 11 should start normally. If the first check valve 13 is open, it can be determined that the first exhaust fan 11 is in normal working condition. If the first check valve 13 is closed, it can be determined that the first exhaust fan 11 has malfunctioned, and there is a risk of unfiltered airflow escaping from the working area.

[0053] Based on this, this disclosure employs a cabinet door opening / closing detection structure to detect the opening and closing status of the cabinet door, and sets up an alarm mechanism 60 to remind personnel to repair the faulty first exhaust fan 11. The first control mechanism 30, in conjunction with the opening and closing status of the first check valve 13 and the cabinet door, can promptly start the second exhaust fan 12 after the first exhaust fan 11 malfunctions to prevent airflow overflow from the work area and to trigger an alarm signal from the alarm mechanism 60, facilitating personnel to repair the first exhaust fan 11. When the first exhaust fan 11 is operating normally, the exhaust air will be filtered through the exhaust filter 16, and the second exhaust fan 12 does not need to be activated.

[0054] As an example, the first control mechanism 30 and the second control mechanism 40 can be selected from general-purpose microcontrollers of model 80C51, or they can be PCB boards.

[0055] Optionally, the first control mechanism 30 includes a trigger unit 15, which is connected to the first check valve 13. The trigger unit 15 is used to control the power-on / off state of the second exhaust fan 12 according to the opening and closing state of the first check valve 13.

[0056] It is understandable that the triggering unit 15 keeps the second exhaust fan 12 in a de-energized state when the first exhaust fan 11 is running normally, and keeps the second exhaust fan 12 in a energized state when the first exhaust fan 11 fails, so that the first control mechanism 30 can control the operation of the second exhaust fan 12.

[0057] Optionally, the triggering unit 15 includes a trigger element 151 and a trigger switch 152. The trigger element 151 is connected to the fan blades of the first check valve 13; the trigger switch 152 is installed on the inner wall of the exhaust box 10, and the trigger switch 152 includes a triggering structure, which corresponds to the position of the trigger element 151. When the first check valve 13 is closed, the fan blades of the first check valve 13 close, and the trigger element 151 triggers the trigger switch 152, so that the second exhaust fan 12 is in a powered-on state; when the first check valve 13 is open, the fan blades of the first check valve 13 rotate, and the trigger element 151 disengages from the triggering structure of the trigger switch 152, so that the second exhaust fan 12 is in a powered-off state.

[0058] Understandably, this disclosure converts the opening and closing state of the first check valve 13 into the triggering condition of the trigger switch 152. By fixing the position of the trigger switch 152 and setting the trigger element 151 on the fan blade of the movable first check valve 13, the opening and closing state of the trigger switch 152 can be adjusted by changing the position of the fan blade. When the first check valve 13 is closed, the fan blade is closed, and the trigger element 151 and the trigger switch 152 are in contact or close together, energizing the second exhaust fan 12. When the first check valve 13 is open, the fan blade is open, and the trigger element 151 disengages from the trigger switch 152, de-energizing the second exhaust fan 12. This ensures that the second exhaust fan 12 is energized when the first exhaust fan 11 fails. The second exhaust fan 12 can adopt an exhaust fan structure that exhausts air as soon as it is powered on. Alternatively, the first control mechanism 30 can be configured to detect that the second exhaust fan 12 is powered on and control the second exhaust fan 12 to start exhausting air; or the first control mechanism 30 can be configured to detect that the cabinet door is open and the second exhaust fan 12 is powered on and control the second exhaust fan 12 to start exhausting air.

[0059] As an example, trigger 151 is a magnet, and trigger switch 152 is a magnetic switch. When the first check valve 13 is closed, the fan blades of the first check valve 13 close, the magnet attracts the magnetic switch, and the second exhaust fan 12 is energized. When the first check valve 13 is open, the fan blades of the first check valve 13 flip, the magnet disengages from the trigger structure of the magnetic switch, and the second exhaust fan 12 is de-energized.

[0060] As another example, the trigger switch 152 can be in the form of a limit switch or a micro switch.

[0061] Combination Figures 1 to 5 As shown, the biosafety cabinet disclosed herein will be described below.

[0062] The biosafety cabinet includes a cabinet body, an exhaust box 10, and an air supply box 20. The exhaust box 10 is installed at the top of the cabinet body and is used to exhaust air to the outside; the air supply box 20 is installed in the upper middle part of the cabinet body, below the exhaust box 10, and is used to supply air to the work area.

[0063] like Figure 5 As shown, the biosafety cabinet also includes a control system, which includes a first control mechanism 30, a second control mechanism 40, a cabinet door opening / closing detection mechanism 50, an alarm mechanism 60, a first exhaust fan 11, and a second exhaust fan 12. The first control mechanism 30 includes a trigger unit 15, which is connected to the second exhaust fan 12. The first control mechanism 30 is connected to the cabinet door opening / closing detection mechanism 50, the alarm mechanism 60, and the second exhaust fan 12. The second control mechanism 40 is connected to the cabinet door opening / closing detection mechanism 50 and the first exhaust fan 11.

[0064] The exhaust box 10 includes a first air inlet, a second air inlet, an air outlet, and an exhaust filter 16. The first air inlet is located at the first end of the exhaust box 10, the second air inlet is located at the second end of the exhaust box 10, and the air outlet is located at the top of the exhaust box 10. The exhaust filter 16 is installed at the air outlet. A first exhaust fan 11 is connected to the first air inlet; a second exhaust fan 12 is connected to the second air inlet; a first check valve 13 is installed at the first air inlet to allow airflow from the first exhaust fan 11 into the exhaust box 10; a second check valve 14 is installed at the second air inlet to allow airflow from the second exhaust fan 12 into the exhaust box 10. The first check valve 13 and the second check valve 14 are arranged opposite to each other, and the conduction directions of the two check valves are opposite. This forms an interlocking design between the combination of the first exhaust fan 11 and the first check valve 13 and the combination of the second exhaust fan 12 and the second check valve 14. This ensures that the exhaust box 10 always maintains positive pressure when either exhaust fan is running, and gas can be discharged from the exhaust filter 16, ensuring that the airflow in the working area does not overflow.

[0065] A magnet is installed on the fan blade of the first check valve 13, and a magnetic switch is installed on the exhaust box 10. The positions of the magnet and the magnetic switch correspond.

[0066] When the biosafety cabinet is in the open position, the first exhaust fan 11 runs automatically. The airflow generated by the first exhaust fan 11 causes the first check valve 13 to open. The magnet and the magnetic control switch are separated, and the trigger unit 15 keeps the second exhaust fan 12 de-energized. At the same time, the airflow keeps the second check valve 14 closed, allowing airflow to be discharged from the exhaust filter 16, and preventing airflow from overflowing from the work area.

[0067] When the biosafety cabinet is in the open position, if the first exhaust fan 11 malfunctions, the first check valve 13 is in the closed position, the magnet and the magnetic control switch remain close together, the trigger unit 15 energizes the second exhaust fan 12, the second exhaust fan 12 is powered on and runs, the warning mechanism 60 issues a warning signal, the second check valve 14 opens, and at the same time the airflow keeps the first check valve 13 closed, so that airflow can be discharged from the exhaust filter 16, and the airflow in the work area does not overflow.

[0068] Combination Figure 6 As shown, this disclosure provides a control method for a biosafety cabinet, applied to the biosafety cabinet described above. The control method includes:

[0069] S01, The control device acquires the opening and closing status of the biosafety cabinet door;

[0070] S02, when the cabinet door is open, the control device controls the first exhaust fan 11 to run. Under the action of the airflow from the first exhaust fan 11, the first check valve 13 opens and the second check valve 14 closes.

[0071] S03, obtain the opening and closing status of the first check valve 13;

[0072] S04, the control device controls the operation of the second exhaust fan 12 according to the opening and closing status of the first check valve 13.

[0073] It is understood that the control device includes the aforementioned first control mechanism 30 and second control mechanism 40. Since the first exhaust fan 11 generates airflow during normal operation, it drives the first check valve 13 to open. This disclosure utilizes the cooperation between the first check valve 13 and the first exhaust fan 11 to determine the state of the first exhaust fan 11. That is, when the cabinet door is open, the first exhaust fan 11 should start normally. If the first check valve 13 is open, it can be determined that the first exhaust fan 11 is in normal working condition; if the first check valve 13 is closed, it can be determined that the first exhaust fan 11 has malfunctioned, and there is a risk of unfiltered airflow escaping from the working area.

[0074] Using the control method for biosafety cabinets provided in this embodiment, when the biosafety cabinet is in the open state, the control device controls the first exhaust fan 11 to run automatically, and by detecting the opening and closing state of the first check valve 13, it can determine whether the first exhaust fan 11 is in a fault state, so as to control the operating state of the second exhaust fan 12.

[0075] Optionally, in step S03, the control device controls the operating state of the second exhaust fan 12 according to the opening and closing state of the first check valve 13, including:

[0076] When the first check valve 13 is open, the control device controls the second exhaust fan 12 to be in the off state;

[0077] When the first check valve 13 is closed, the control device controls the second exhaust fan 12 to run, and if the first exhaust fan 11 is found to be faulty, controls the warning mechanism 60 to issue a warning signal.

[0078] It is understandable that if the first check valve 13 is open when the cabinet door is open, it can be inferred that the first exhaust fan 11 is in normal working condition, and the second exhaust fan 12 can be closed. If the first check valve 13 is closed, it can be determined that the first exhaust fan 11 has malfunctioned, and there is a risk that the airflow in the working area is not filtered and escapes. The control device controls the second exhaust fan 12 to run and the warning mechanism 60 issues a warning signal to facilitate maintenance by the staff.

[0079] Optionally, in step S03, the control device controls the operating state of the second exhaust fan 12 according to the opening and closing state of the first check valve 13, and further includes:

[0080] When the first check valve 13 is opened, the control device controls the second exhaust fan 12 to be de-energized;

[0081] When the first check valve 13 is closed, the control device controls the second exhaust fan 12 to be energized and run.

[0082] It is understood that the method disclosed herein is used in conjunction with the triggering unit 15. When the cabinet door is open, if the first check valve 13 is open, it can be inferred that the first exhaust fan 11 is in normal working condition, and the second exhaust fan 12 can be de-energized. If the first check valve 13 is closed, it can be determined that the first exhaust fan 11 has malfunctioned, and there is a risk that the airflow in the working area will escape without being filtered. The control device controls the second exhaust fan 12 to be energized and run, so that the second exhaust fan 12 drives the airflow into the exhaust box 10 and into the exhaust filter 16 for filtration before being discharged, thus preventing the airflow in the working area from overflowing.

[0083] Combination Figure 7 As shown, this embodiment of the present disclosure provides a control device for a biosafety cabinet, including a monitoring module 70, a first control unit 80, and a second control unit 90.

[0084] The monitoring module 70 is configured to monitor the opening and closing status of the biosafety cabinet door.

[0085] The first control unit 80 is configured to control the operation of the first exhaust fan 11 and monitor the opening and closing status of the first check valve 13 when the cabinet door is open.

[0086] The second control unit 90 is configured to control the operating status of the second exhaust fan 12 and / or the warning mechanism 60 according to the opening and closing status of the first check valve 13.

[0087] Combination Figure 8 As shown, this disclosure provides a control device for a biosafety cabinet, including a processor 100 and a memory 101. Optionally, the device may further include a communication interface 102 and a bus 103. The processor 100, communication interface 102, and memory 101 can communicate with each other via the bus 103. The communication interface 102 can be used for information transmission. The processor 100 can call logical instructions in the memory 101 to execute the control method for the biosafety cabinet described in the above embodiment.

[0088] Furthermore, the logic instructions in the aforementioned memory 101 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0089] The memory 101, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 100 executes functional applications and data processing by running the program instructions / modules stored in the memory 101, thereby implementing the control method for the biosafety cabinet in the above embodiments.

[0090] The memory 101 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 101 may include high-speed random access memory and may also include non-volatile memory.

[0091] This disclosure provides a biosafety cabinet that includes the control device described above for a biosafety cabinet.

[0092] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the control method for a biosafety cabinet described above.

[0093] This disclosure provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions that, when executed by a computer, cause the computer to perform the control method for a biosafety cabinet described above.

[0094] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0095] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0096] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or,” as used herein, means including any and all possible combinations of one or more of the associated lists. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0097] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0098] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection shown or discussed between each other may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0099] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A biological safety cabinet, characterized in that, include: The exhaust box (10) includes a first air inlet, a second air inlet, and an air outlet; An exhaust filter (16) is installed at the air outlet; The first row of fans (11) is connected to the first air inlet; The second exhaust fan (12) is connected to the second air inlet; The first check valve (13) is installed at the first air inlet and is used to allow airflow from the first exhaust fan (11) into the exhaust box (10); The second check valve (14) is installed at the second air inlet and is used to allow airflow from the second exhaust fan (12) into the exhaust box (10); When the first exhaust fan (11) is working normally, under the action of the airflow of the first exhaust fan (11), the first check valve (13) opens and the second check valve (14) closes, the second exhaust fan (12) closes, and the airflow in the biosafety cabinet enters the exhaust box (10) through the first air inlet and flows out from the air outlet under the action of the first exhaust fan (11). When the first exhaust fan (11) is in a fault state, the first check valve (13) is closed, the second exhaust fan (12) is opened, the second check valve (14) is opened, and the airflow enters the exhaust box (10) through the second air inlet under the action of the second exhaust fan (12) and flows out from the air outlet. The first check valve (13) and the second check valve (14) are arranged opposite to each other, and the conduction directions of the two check valves are opposite, forming an interlocking design between the combination of the first exhaust fan (11) and the first check valve (13) and the combination of the second exhaust fan (12) and the second check valve (14). The biosafety cabinet also includes a first control mechanism (30), which includes: The triggering unit (15) is connected to the first check valve (13). The triggering unit (15) is used to control the power-on / off state of the second exhaust fan (12) according to the opening and closing state of the first check valve (13).

2. The biosafety cabinet according to claim 1, characterized in that, The first air inlet is located at the first end of the exhaust box (10), the second air inlet is located at the second end of the exhaust box (10), and the air outlet is located at the top of the exhaust box (10).

3. The biosafety cabinet according to claim 2, characterized in that, The first check valve (13) and the second check valve (14) divide the exhaust box (10) into a first air inlet section, a purified exhaust section, and a second air inlet section in sequence. The exhaust filter (16) is located at the upper part of the purified exhaust section.

4. The biological safety cabinet according to any one of claims 1 to 3, wherein, Also includes: Cabinet door opening / closing detection mechanism (50) is used to detect the opening and closing status of the cabinet door; Warning mechanism (60) is used to issue a warning signal when the first exhaust fan (11) fails; The first control mechanism (30) is connected to the first check valve (13), the cabinet door switch detection mechanism (50), the warning mechanism (60), and the second exhaust fan (12). The control mechanism is configured to control the second exhaust fan (12) to de-energize when the first check valve (13) is open; and to control the second exhaust fan (12) to run and the warning mechanism (60) to issue a warning signal when the cabinet door is open and the first check valve (13) is closed.

5. The biosafety cabinet according to claim 4, characterized in that, The triggering unit (15) includes: The trigger (151) is connected to the fan blade of the first check valve (13); A trigger switch (152) is installed on the inner wall of the exhaust box (10). The trigger switch (152) includes a trigger structure, which corresponds to the position of the trigger element (151). The trigger switch (152) is used to close the fan blades of the first check valve (13) when the first check valve (13) is closed, and the trigger element (151) triggers the trigger switch (152) to energize the second exhaust fan (12). When the first check valve (13) is open, the fan blades of the first check valve (13) rotate, and the trigger element (151) disengages from the trigger structure to de-energize the second exhaust fan (12).

6. The biosafety cabinet according to claim 5, characterized in that, The trigger element is a magnet, and the trigger switch is a magnetic switch.

7. The biosafety cabinet according to claim 4, characterized in that, Also includes: The second control mechanism (40) is connected to the cabinet door opening and closing detection mechanism (50) and the first exhaust fan (11). The second control mechanism (40) is configured to control the first exhaust fan (11) to run when the cabinet door is in the open state.

8. A control method for a biosafety cabinet, characterized in that, The control method, applied to the biosafety cabinet as described in any one of claims 1 to 7, comprises: Obtain the open / closed status of the biosafety cabinet door; When the cabinet door is open, the first exhaust fan (11) is controlled to run. Under the airflow of the first exhaust fan (11), the first check valve (13) opens and the second check valve (14) closes. Obtain the opening and closing status of the first check valve (13); The operating status of the second exhaust fan (12) is controlled according to the opening and closing status of the first check valve (13).

9. The control method according to claim 8, characterized in that, The step of controlling the operating state of the second exhaust fan (12) according to the opening and closing state of the first check valve (13) includes: When the first check valve (13) is open, the second exhaust fan (12) is controlled to be in the closed state; When the first check valve (13) is closed, the second exhaust fan (12) is controlled to run, and if the first exhaust fan (11) is found to be faulty, the warning mechanism (60) is controlled to issue a warning signal.

Images