Safety cabinet with switch door negative pressure protection and negative pressure protection control method thereof

Abstract

This application belongs to the technical field of biosafety cabinets, specifically relating to a biosafety cabinet with negative pressure protection during door opening and closing, and its negative pressure protection control method. Before opening the glass door, the air guide vanes are in a horizontal position, isolating the upper and lower air boxes. Pressing the open button delays the glass door opening by 10 seconds, and the fan immediately starts automatically. The airflow from the fan only enters the upper air box, forming a negative pressure airflow surrounding the biosafety cabinet body, preventing any downward airflow and thus preventing overflow. One minute after the glass door opens, the fan speed reaches its nominal speed. Once the negative pressure in the biosafety cabinet body is sufficient, the motor actuator controls the air guide vanes to rotate and become vertical, generating a downward airflow, allowing the operator to use the biosafety cabinet normally. Before closing the glass door, pressing the close button causes the motor actuator to control the air guide vanes to rotate and become horizontal. The airflow from the fan outlet only enters the upper air box, forming a negative pressure airflow surrounding the biosafety cabinet body, preventing any downward airflow and thus preventing overflow.

Description

Technical Field

[0001] This application belongs to the technical field of biosafety cabinets, specifically relating to a biosafety cabinet with negative pressure protection when the door is opened and closed, and a negative pressure protection control method thereof. Background Technology

[0002] A biosafety cabinet (BSC) is a box-type air-purifying negative pressure safety device that prevents the aerosol release of hazardous or unknown biological particles during experimental procedures. It is widely used in research, teaching, clinical testing, and production in fields such as microbiology, biomedicine, genetic engineering, and biopharmaceuticals, and is the most basic safety protection equipment in the primary protection barrier of laboratory biosafety.

[0003] Biosafety cabinets have a sliding glass door at the front operating opening. The principle behind their protective function is as follows: The biosafety cabinet generates directional airflow, including inflow and downflow. First, the inflow airflow is filtered through a high-efficiency particulate air filter (HEPA filter) before entering the biosafety cabinet to prevent sample contamination. The filtered, clean downflow circulates within the biosafety cabinet and contacts the experimental samples. A portion of the downflow continuously mixes with the inflow air and recirculates. During this process, the downflow blocks the unfiltered inflow airflow, preventing it from contacting the experimental samples and thus protecting them from indoor air contamination. Finally, the exhaust air from the biosafety cabinet is filtered through an HEPA filter before being released into the environment, thus protecting the environment.

[0004] Current biosafety cabinets suffer from insufficient negative pressure when the glass door is opened: after the door is closed, the internal fan runs at a low speed to maintain a slight negative pressure. When the door is opened again, the fan accelerates from a low speed, rather than starting from zero, which alleviates the insufficient negative pressure to some extent. However, this method has the drawback that as long as the fan is running, there is a risk of downward airflow overflowing, meaning the biosafety cabinet still suffers from insufficient negative pressure when the glass door is opened. Summary of the Invention

[0005] In order to solve the above-mentioned problems in the prior art, namely, to reduce or prevent the leakage of downward airflow and improve or solve the defect of insufficient negative pressure when the glass door of the biosafety cabinet is opened, this application provides a biosafety cabinet with negative pressure protection for opening and closing the door and a negative pressure protection control method thereof.

[0006] This application provides a biosafety cabinet with negative pressure protection for opening and closing the door. The biosafety cabinet is equipped with an openable and closable opening and closing mechanism, which is used to divide the air box of the biosafety cabinet into an independently existing upper air box and a lower air box. An exhaust air filter is installed in the upper air box, and an air supply filter is installed in the lower air box.

[0007] By adopting the above technical solution, the negative pressure protection control principle of this application is as follows: A closable opening and closing mechanism divides the airbox of the biosafety cabinet into two independent parts: an upper airbox and a lower airbox. This mechanism resembles a louvered structure, with the upper airbox connected to the exhaust filter and the lower airbox connected to the supply air filter. Before opening the glass door, pressing the open button delays the opening of the glass door by 10 seconds. The closable opening and closing mechanism remains closed, isolating the upper and lower airboxes. After pressing the open button, the fan automatically starts, and the exhaust airflow only enters the upper airbox, forming a negative pressure airflow surrounding the biosafety cabinet body. No downward airflow is generated, thus preventing the downward airflow from overflowing. Therefore, the biosafety cabinet does not suffer from insufficient negative pressure when the glass door is opened. One minute after opening the glass door, once the fan speed reaches its nominal speed and the negative pressure in the upper airbox is sufficient, the closable opening and closing mechanism opens, generating a downward airflow, allowing the operator to use the biosafety cabinet normally. Before closing the glass door, press the close button. The opening and closing mechanism will close the door, and the airflow from the fan outlet will only enter the upper air box, creating a negative pressure airflow surrounding the biosafety cabinet. This prevents downward airflow and avoids leakage of downward airflow, thus eliminating the problem of insufficient negative pressure when the biosafety cabinet opens the glass door. The glass door will automatically close 10 seconds after pressing the close button.

[0008] In the preferred technical solution of the above-mentioned biosafety cabinet with negative pressure protection for opening and closing the door, the opening and closing mechanism includes a rotating component, a transmission rod, multiple air guide vanes, and multiple rotating shafts;

[0009] Each of the rotating shafts is arranged side by side and parallel to each other, and each of the rotating shafts is rotatably connected to the cabinet body of the biosafety cabinet. The rotation axis of the rotating component is parallel to the rotation axis of the rotating shaft, and the rotating component is arranged side by side with all the rotating shafts.

[0010] Each of the rotating shafts and the rotating components is connected to two air guide vanes, and the two air guide vanes are arranged in a staggered manner with respect to the rotating shaft or the rotating component;

[0011] The air guide vanes located on the same side as all the rotating shafts and the rotating components are rotatably connected to a connecting shaft, and all the connecting shafts are rotatably connected to the transmission rod.

[0012] By adopting the above technical solution, when the opening and closing mechanism is opened, the rotating component acts as a power source, rotating to drive the two guide vanes connected to it to rotate. These guide vanes, in turn, cause their end-mounted transmission rods to swing in three-dimensional space. The transmission rods then drive all the remaining guide vanes to rotate synchronously, thus opening the mechanism. When the guide vanes rotate to a vertical position, the mechanism is fully open. Simultaneously, the guide vanes improve the uniformity of the descending airflow. Each connecting shaft enables the rotational connection between the guide vanes and the transmission rod, and each shaft provides rotational support for the guide vanes. When the opening and closing mechanism closes, the rotating component rotates in the opposite direction, driving the two guide vanes connected to it to rotate in the opposite direction. These guide vanes, through the transmission rods, drive the remaining guide vanes to rotate synchronously in the opposite direction. When the guide vanes rotate to a horizontal position, the mechanism is fully closed.

[0013] In the preferred embodiment of the above-mentioned biosafety cabinet with negative pressure protection for door opening and closing, the rotating component is a rotating component composed of a motor actuator.

[0014] By adopting the above technical solution, the electric actuator has convenient energy access and rapid signal transmission. The rotating part is a rotating part composed of a motor actuator, which is a specific way of selecting the rotating part.

[0015] In the preferred technical solution of the above-mentioned biosafety cabinet with negative pressure protection for opening and closing the door, there are two transmission rods, which are located at both ends of the connecting shaft, and are rotatably connected to both ends of the connecting shaft.

[0016] By adopting the above technical solution, since transmission rods are set at both ends of the connecting shaft, the force on the connecting shaft can be balanced, making the movement of the connecting shaft more stable, and the two transmission rods increase the overall structural strength of the opening and closing mechanism.

[0017] In the preferred embodiment of the above-mentioned biosafety cabinet with negative pressure protection for door opening and closing, the exhaust filter is located at the top of the upper air box.

[0018] By adopting the above technical solution, this is a specific structural form for the location of the exhaust filter, which enables all the gas in the upper air box to pass through the filtration function of the exhaust filter, achieving the best effect in terms of purification.

[0019] In the preferred embodiment of the above-mentioned biosafety cabinet with negative pressure protection for door opening and closing, the air supply filter is located at the top of the lower air box.

[0020] By adopting the above technical solution, this is a specific structural form for the placement of the air supply filter, which enables all the descending gas in the lower air box to pass through the air supply filter, keeping the experimental sample continuously clean and thus effectively protecting the experimental sample.

[0021] In the preferred technical solution of the above-mentioned biosafety cabinet with negative pressure protection for door opening and closing, a tubular motor is installed inside the air box of the biosafety cabinet, and the tubular motor and the glass door are connected by a transmission belt, with the transmission belt wound around the tubular motor.

[0022] By adopting the above technical solution, the tubular motor can drive the glass door to rise and fall via a transmission belt, thereby realizing the automatic opening or closing of the glass door.

[0023] In the preferred embodiment of the above-mentioned biosafety cabinet with negative pressure protection for door opening and closing, there are at least two drive belts, which are located at both ends of the tubular motor.

[0024] By adopting the above technical solution, at least two transmission belts can make the connection between the tubular motor and the glass door more stable, making the operation of the glass door safer.

[0025] This application also provides a negative pressure protection control method for a biosafety cabinet. In a biosafety cabinet using the aforementioned negative pressure protection method, before opening the glass door, the air guide vane is in a horizontal position, isolating the upper air box from the lower air box. When the door opening button is pressed, the glass door opens after a 10-second delay, and the fan immediately starts automatically. The fan's exhaust airflow only enters the upper air box, forming a negative pressure airflow surrounding the biosafety cabinet body, without generating a downward airflow, thus preventing the downward airflow from overflowing. One minute after the glass door opens, the fan speed reaches its nominal speed. Once the negative pressure in the biosafety cabinet body is sufficient, the motor actuator controls the air guide vane to rotate and become vertical, generating a downward airflow, allowing the operator to use the biosafety cabinet normally.

[0026] By adopting the above technical solution, the negative pressure protection control principle of this application is as follows: A closable opening and closing mechanism is used to divide the airbox of the biosafety cabinet into two independent parts: an upper airbox and a lower airbox. This mechanism is similar to a louvered structure. Before opening the glass door, pressing the door opening button delays the opening of the glass door by 10 seconds. All air guide vanes are in a horizontal state, and the closable opening and closing mechanism is in a closed state, isolating the upper and lower airboxes. After pressing the door opening button, the fan automatically starts, and the airflow from the fan only enters the upper airbox, forming a negative pressure airflow surrounding the biosafety cabinet body. No downward airflow is generated, thus preventing the downward airflow from overflowing. Therefore, the biosafety cabinet does not suffer from insufficient negative pressure when the glass door is opened. One minute after the glass door is opened, once the fan speed reaches its nominal speed and the negative pressure in the upper airbox is sufficient, the closable opening and closing mechanism opens, generating a downward airflow, allowing the operator to use the biosafety cabinet normally.

[0027] In the preferred technical solution of the above-mentioned negative pressure protection control method for biosafety cabinet, before closing the glass door, pressing the door close button causes the motor actuator to control the air guide vane to rotate and be placed horizontally. The airflow from the fan outlet only enters the upper air box, forming a negative pressure airflow surrounding the biosafety cabinet body, without generating a downward airflow, thus preventing the downward airflow from overflowing. After pressing the door close button for 10 seconds, the tubular motor controls the glass door to close automatically via the transmission belt.

[0028] By adopting the above technical solution, before closing the glass door, pressing the close button causes the rotating component to rotate in the opposite direction. This rotation drives two connected air guide vanes to rotate in the opposite direction, which in turn drives the remaining air guide vanes to rotate synchronously in the opposite direction via a transmission rod. When the air guide vanes rotate to a horizontal position, the opening and closing mechanism is fully closed. The airflow from the fan outlet only enters the upper air box, forming a negative pressure airflow surrounding the biosafety cabinet body, preventing downward airflow and thus preventing the leakage of downward airflow. The biosafety cabinet does not suffer from insufficient negative pressure when the glass door is opened. The glass door closes automatically 10 seconds after the close button is pressed.

[0029] Those skilled in the art will understand that the embodiments of this application provide a biosafety cabinet with negative pressure protection for opening and closing the door. The biosafety cabinet is provided with an openable and closable opening and closing mechanism, which is used to divide the air box of the biosafety cabinet into an independently existing upper air box and a lower air box. An exhaust air filter is provided in the upper air box, and an air supply filter is provided in the lower air box.

[0030] Those skilled in the art will understand that this application also provides a negative pressure protection control method for a biosafety cabinet. In a biosafety cabinet using the aforementioned negative pressure protection method, before opening the glass door, the air guide vanes are horizontally positioned, isolating the upper and lower air boxes. When the open button is pressed, the glass door opens after a 10-second delay, and the fan immediately starts automatically. The fan's airflow only enters the upper air box, forming a negative pressure airflow surrounding the biosafety cabinet body, preventing any downward airflow and thus preventing overflow. One minute after the glass door opens, the fan speed reaches its nominal speed. Once the negative pressure in the biosafety cabinet body is sufficient, the motor actuator controls the air guide vanes to rotate and become vertical, generating a downward airflow, allowing the operator to use the biosafety cabinet normally. Before closing the glass door, pressing the close button causes the motor actuator to control the air guide vanes to rotate and become horizontal. The fan's airflow only enters the upper air box, forming a negative pressure airflow surrounding the cabinet body, preventing any downward airflow and thus preventing overflow. Ten seconds after pressing the close button, the tubular motor controls the glass door to close automatically via a drive belt.

[0031] The negative pressure protection control principle of this application is as follows: A closable opening and closing mechanism is used to divide the airbox of the biosafety cabinet into two independent parts: an upper airbox and a lower airbox. This mechanism is similar to a louvered structure. Before opening the glass door, pressing the door opening button delays the opening of the glass door by 10 seconds. All air guide vanes are in a horizontal position, and the closable opening and closing mechanism is in a closed position, isolating the upper and lower airboxes. After pressing the door opening button, the fan automatically turns on, and the airflow from the fan only enters the upper airbox, forming a negative pressure airflow surrounding the biosafety cabinet body. No downward airflow is generated, thus preventing the downward airflow from overflowing. Therefore, the biosafety cabinet does not suffer from insufficient negative pressure when the glass door is opened. One minute after the glass door is opened, once the fan reaches its nominal speed and the negative pressure in the upper air box is sufficient, the rotating component, acting as the power source, begins to rotate. This rotation drives two connected air guide vanes to rotate, which in turn cause their respective end-mounted transmission rods to oscillate in three-dimensional space. The transmission rods then drive all the remaining air guide vanes to rotate synchronously, opening the opening and closing mechanism. When the air guide vanes rotate to a vertical position, the opening and closing mechanism is fully open. Simultaneously, the air guide vanes improve the uniformity of the descending airflow, generating a downward airflow that allows the operator to use the biosafety cabinet normally. Before closing the glass door, pressing the close button causes the rotating component to rotate in the opposite direction. This rotation drives the two connected air guide vanes to rotate in the opposite direction, which in turn drives the remaining air guide vanes to rotate synchronously in the opposite direction via the transmission rod. When the air guide vanes rotate to a horizontal position, the opening and closing mechanism is fully closed. The airflow from the fan outlet only enters the upper air box, forming a negative pressure airflow surrounding the biosafety cabinet body, preventing the downward airflow from overflowing. Therefore, the biosafety cabinet does not suffer from insufficient negative pressure when the glass door is opened. The glass door closes automatically 10 seconds after you press the close button. Attached Figure Description

[0032] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0033] Figure 1 This is a schematic diagram of the opening and closing mechanism of the biosafety cabinet in the embodiment of this application in the closed state;

[0034] Figure 2 This is a schematic diagram of the opening and closing mechanism of the biosafety cabinet in the embodiment of this application in the open state;

[0035] Figure 3 This is a schematic diagram of the opening and closing mechanism in the open state according to an embodiment of this application;

[0036] Figure 4 This is a schematic diagram of the glass door in the closed state according to an embodiment of this application.

[0037] Figure label:

[0038] 100 - Opening and closing mechanism; 110 - Rotating component; 120 - Transmission rod; 130 - Air guide vane; 140 - Rotating shaft; 150 - Coupling shaft;

[0039] 200 - Upper air box; 210 - Exhaust air filter;

[0040] 300 - Lower air box; 310 - Supply air filter;

[0041] 400-Tube Motor;

[0042] 500 - Drive belt;

[0043] 600-Glass door;

[0044] 700-fan.

[0045] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention 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 so that embodiments of the invention described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0048] In this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0049] Example 1

[0050] This application provides a biosafety cabinet with negative pressure protection when the door is opened and closed. Figure 1 This is a schematic diagram of the opening and closing mechanism 100 in the biosafety cabinet of this application in the closed state. Figure 2 This is a schematic diagram of the opening and closing mechanism 100 in the biosafety cabinet of this application in the open state. Please refer to... Figure 1 and Figure 2 The biosafety cabinet is equipped with an openable and closable opening and closing mechanism 100, which is used to divide the air box of the biosafety cabinet into an independently existing upper air box 200 and a lower air box 300. An exhaust air filter 210 is installed in the upper air box 200, and an air supply filter 310 is installed in the lower air box 300.

[0051] The opening and closing mechanism 100 is located at the bottom of the air outlet of the fan 700; the upper air box 200 is located at the top of the lower air box 300; the exhaust filter 210 is fixedly connected to the inner wall of the upper air box 200 on all four sides, for example, by adhesive or damping clamp; the supply air filter 310 is fixedly connected to the inner wall of the lower air box 300 on all four sides, for example, by adhesive or damping clamp.

[0052] By adopting the above technical solution, the negative pressure protection control principle of this application is as follows: A closable opening and closing mechanism 100 is used to divide the airbox of the biosafety cabinet into two independent parts: an upper airbox 200 and a lower airbox 300. The closable opening and closing mechanism 100 is similar to a louver structure. The upper airbox 200 is connected to the exhaust filter 210, and the lower airbox 300 is connected to the supply air filter 310. Before opening the glass door 600, pressing the door opening button will delay the opening of the glass door 600 by 10 seconds. The closable opening and closing mechanism 100 is in the closed state, isolating the upper airbox 200 and the lower airbox 300. After pressing the door opening button, the fan 700 automatically turns on. The airflow from the fan 700 only enters the upper airbox 200, forming a negative pressure airflow surrounding the biosafety cabinet body, without generating a downward airflow, thus preventing the downward airflow from overflowing. Therefore, the biosafety cabinet does not suffer from insufficient negative pressure when the glass door 600 is opened. One minute after opening the glass door 600, once the fan 700 reaches its nominal speed and the negative pressure in the upper air box 200 is sufficient, the opening and closing mechanism 100 opens, generating a downward airflow, allowing the operator to use the biosafety cabinet normally. Before closing the glass door 600, pressing the close button closes the opening and closing mechanism 100, causing the airflow from the fan 700 outlet to only enter the upper air box 200, creating a negative pressure airflow surrounding the biosafety cabinet body and preventing downward airflow from overflowing. Therefore, the biosafety cabinet does not suffer from insufficient negative pressure when the glass door 600 is opened. The glass door 600 automatically closes 10 seconds after the close button is pressed.

[0053] Figure 3 This is a schematic diagram of the opening and closing mechanism 100 in the open state according to an embodiment of this application. Please refer to it. Figure 2 and Figure 3 In this embodiment of the application, the opening and closing mechanism 100 includes a rotating component 110, a transmission rod 120, multiple air guide vanes 130, and multiple rotating shafts 140. Each rotating shaft 140 is arranged side by side and parallel to each other, and each rotating shaft 140 is rotatably connected to the cabinet body of the biosafety cabinet. The rotation axis of the rotating component 110 is parallel to the rotation axis of the rotating shaft 140, and the rotating component 110 is arranged side by side with all the rotating shafts 140. Each rotating shaft 140 and the rotating component 110 is connected to two air guide vanes 130, and the two air guide vanes 130 are staggered about the rotating shaft 140 or the rotating component 110. The air guide vanes 130 located on the same side of all the rotating shafts 140 and the rotating component 110 are rotatably connected to a connecting shaft 150, and all the connecting shafts 150 are rotatably connected to the transmission rod 120.

[0054] All the rotating shafts 140 and rotating components 110 are at the same horizontal height. Each rotating shaft 140 is inserted into the side wall of the biosafety cabinet and is rotatably connected to the biosafety cabinet. The transmission rod 120 is connected to the connecting shaft 150 at the end of the connecting shaft 150.

[0055] By adopting the above technical solution, when the opening and closing mechanism 100 is opened, the rotating component 110 rotates as a power source, driving the two guide vanes 130 connected to it to rotate. The corresponding guide vanes 130 drive the transmission rod 120 at their ends to swing in three-dimensional space. The transmission rod 120 drives all the remaining guide vanes 130 to rotate synchronously, thus opening the opening and closing mechanism 100. When the guide vanes 130 rotate to a vertical position, the opening and closing mechanism 100 reaches a fully open state. Simultaneously, the guide vanes 130 improve the uniformity of the descending airflow. Each connecting shaft 150 achieves a rotatable connection between the guide vane 130 and the transmission rod 120, and each rotating shaft 140 provides rotatable support for the guide vane 130. When the opening and closing mechanism 100 performs the closing action, the rotating component 110 rotates in the opposite direction. The rotating component 110 drives the two air guide vanes 130 connected to it to rotate in the opposite direction. The air guide vanes 130 drive the remaining air guide vanes 130 to rotate synchronously in the opposite direction through the transmission rod 120. When the air guide vanes 130 rotate to a horizontal state, the opening and closing mechanism 100 is in a fully closed state.

[0056] Please refer to Figure 3 In this embodiment of the application, for example, the rotating component 110 is a rotating component 110 composed of a motor actuator.

[0057] By adopting the above technical solution, the electric actuator has convenient energy access and rapid signal transmission. The rotating component 110 is a rotating component 110 composed of a motor actuator, which is a specific way of selecting the rotating component 110.

[0058] Please refer to Figure 3 In this embodiment of the application, for example, there are two transmission rods 120, which are located at both ends of the connecting shaft 150, and the two transmission rods 120 are rotatably connected to both ends of the connecting shaft 150.

[0059] By adopting the above technical solution, since transmission rods 120 are provided at both ends of the connecting shaft 150, the connecting shaft 150 can be in a balanced state of force, making the movement of the connecting shaft 150 more stable, and the two transmission rods 120 increase the overall structural strength of the opening and closing mechanism 100.

[0060] Please refer to Figure 1 and Figure 2 In this embodiment of the application, for example, the exhaust filter 210 is located at the top of the upper air box 200.

[0061] By adopting the above technical solution, this is a specific structural form for the location of the exhaust filter 210, which enables all the gas in the upper air box 200 to pass through the filtration effect of the exhaust filter 210, achieving the best effect in terms of purification.

[0062] Please refer to Figure 1 and Figure 2 In this embodiment of the application, for example, the air supply filter 310 is located at the top of the lower air box 300.

[0063] By adopting the above technical solution, this is a specific structural form of the air supply filter 310, which enables all the descending gas in the lower air box 300 to be filtered by the air supply filter 310, keeping the experimental sample continuously clean and thus effectively protecting the experimental sample.

[0064] Figure 4 This is a schematic diagram of the glass door 600 in the closed state according to an embodiment of this application. Please refer to it. Figure 4 In this embodiment of the application, for example, a tubular motor 400 is provided inside the air box of the biosafety cabinet. The tubular motor 400 and the glass door 600 are connected by a transmission belt 500, and the transmission belt 500 is wound around the tubular motor 400.

[0065] The tubular motor 400 is fixedly connected to the inner wall of the upper air box 200, and the two ends of the transmission belt 500 are fixedly connected to the output shaft of the tubular motor 400 and the top of the glass door 600, respectively.

[0066] By adopting the above technical solution, the tubular motor 400 can drive the glass door 600 to rise and fall through the transmission belt 500, thereby realizing the automatic opening or closing of the glass door 600.

[0067] Please refer to Figure 4In this embodiment of the application, for example, there are at least two transmission belts 500 located at both ends of the tubular motor 400.

[0068] In this embodiment, there are two transmission belts 500.

[0069] By adopting the above technical solution, at least two transmission belts 500 can make the connection between the tubular motor 400 and the glass door 600 more stable, and make the operation of the glass door 600 safer.

[0070] Example 2

[0071] Please refer to Figure 1 and Figure 2 This application also provides a negative pressure protection control method for a biosafety cabinet. In a biosafety cabinet using the aforementioned door opening and closing negative pressure protection, before opening the glass door 600, the air guide vane 130 is in a horizontal position, isolating the upper air box 200 from the lower air box 300. When the door opening button is pressed, the glass door 600 opens after a 10-second delay, and the fan 700 immediately starts automatically. The airflow from the fan 700 only enters the upper air box 200, forming a negative pressure airflow surrounding the biosafety cabinet body, without generating a downward airflow, thus preventing the downward airflow from overflowing. One minute after the glass door 600 is opened, the fan 700 reaches its nominal speed. After sufficient negative pressure in the biosafety cabinet body, the motor actuator controls the air guide vane 130 to rotate and become vertical, generating a downward airflow, allowing the operator to use the biosafety cabinet normally.

[0072] By adopting the above technical solution, the negative pressure protection control principle of this application is as follows: A closable opening and closing mechanism 100 is used to divide the airbox of the biosafety cabinet into two independent parts: an upper airbox 200 and a lower airbox 300. The closable opening and closing mechanism 100 is similar to a louver structure. Before opening the glass door 600, pressing the door opening button causes a 10-second delay before the glass door 600 opens. All air guide vanes 130 are in a horizontal state, and the closable opening and closing mechanism 100 is in a closed state, isolating the upper airbox 200 and the lower airbox 300. After pressing the door opening button, the fan 700 automatically starts, and the airflow from the fan 700 only enters the upper airbox 200, forming a negative pressure airflow surrounding the biosafety cabinet body. No downward airflow is generated, thus preventing the downward airflow from overflowing. Therefore, the biosafety cabinet does not suffer from insufficient negative pressure when the glass door 600 is opened. One minute after the glass door is opened (600), the fan speed (700) reaches the nominal speed. Once the negative pressure in the upper air box (200) is sufficient, the opening and closing mechanism (100) is opened, generating a downward airflow. At this time, the operator can use the safety cabinet normally.

[0073] Example 3

[0074] Please refer to Figure 1 and Figure 2This application discloses how to avoid insufficient negative pressure in the biosafety cabinet when closing the glass door 600. Before closing the glass door 600, the door closing button is pressed, and the motor actuator controls the air guide vane 130 to rotate and be placed horizontally. The airflow from the outlet of the fan 700 only enters the upper air box 200, forming a negative pressure airflow surrounding the biosafety cabinet body, without generating a downward airflow, thus preventing the downward airflow from overflowing. After pressing the door closing button for 10 seconds, the tubular motor 400 controls the glass door 600 to close automatically via the transmission belt 500.

[0075] By adopting the above technical solution, before closing the glass door 600, pressing the close button causes the rotating component 110 to rotate in the opposite direction. The rotating component 110 drives the two air guide vanes 130 connected to it to rotate in the opposite direction. The air guide vanes 130, through the transmission rod 120, drive the remaining air guide vanes 130 to rotate synchronously in the opposite direction. When the air guide vanes 130 rotate to a horizontal position, the opening and closing mechanism 100 is in a fully closed state. The airflow from the outlet of the fan 700 only enters the upper air box 200, forming a negative pressure airflow surrounding the biosafety cabinet body, preventing downward airflow and thus preventing the downward airflow from overflowing. The biosafety cabinet does not suffer from insufficient negative pressure when the glass door 600 is opened. The glass door 600 automatically closes 10 seconds after the close button is pressed.

[0076] In summary, the negative pressure protection control principle of this application is as follows: A closable opening and closing mechanism 100 is used to divide the airbox of the biosafety cabinet into two independent parts: an upper airbox 200 and a lower airbox 300. The closable opening and closing mechanism 100 is similar to a louver structure. Before opening the glass door 600, pressing the door opening button causes a 10-second delay before the door opens. All air guide vanes 130 are in a horizontal state, and the closable opening and closing mechanism 100 is in a closed state, isolating the upper airbox 200 and the lower airbox 300. After pressing the door opening button, the fan 700 automatically starts, and the airflow from the fan 700 only enters the upper airbox 200, forming a negative pressure airflow surrounding the biosafety cabinet body. No downward airflow is generated, thus preventing the downward airflow from overflowing. Therefore, the biosafety cabinet does not suffer from insufficient negative pressure when the glass door 600 is opened. One minute after the glass door is opened (600), the fan speed (700) reaches the nominal speed. Once the negative pressure in the upper air box (200) is sufficient, the rotating component (110) rotates as the power source. The rotating component (110) drives the two guide vanes (130) connected to it to rotate. The corresponding guide vanes (130) drive the transmission rod (120) at their ends to swing in three-dimensional space. The transmission rod (120) drives all the other guide vanes (130) to rotate synchronously, realizing the opening and closing mechanism (100). When the guide vanes (130) rotate to the vertical position, the opening and closing mechanism (100) reaches the fully open state. At the same time, the guide vanes (130) improve the uniformity of the downward airflow. At this time, a downward airflow is generated, and the operator can use the safety cabinet normally.

[0077] Before closing the glass door 600, press the close button. The rotating component 110 rotates in the opposite direction, driving the two air guide vanes 130 connected to it to rotate in the opposite direction. The air guide vanes 130 drive the remaining air guide vanes 130 to rotate synchronously in the opposite direction via the transmission rod 120. When the air guide vanes 130 rotate to a horizontal position, the opening and closing mechanism 100 is in a fully closed state. The airflow from the outlet of the fan 700 only enters the upper air box 200, forming a negative pressure airflow surrounding the biosafety cabinet body, without generating a downward airflow, thus preventing the downward airflow from overflowing. The biosafety cabinet does not have the defect of insufficient negative pressure when the glass door 600 is opened. After pressing the close button for 10 seconds, the glass door 600 closes automatically.

[0078] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0079] Other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the technical solutions disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

[0080] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for controlling negative pressure protection of a biological safety cabinet, characterized in that, A biosafety cabinet for negative pressure protection during door opening and closing includes an internal opening and closing mechanism comprising a rotating component, a transmission rod, multiple air guide vanes, and multiple rotating shafts. This mechanism divides the biosafety cabinet's airbox into an independently existing upper airbox and a lower airbox. An exhaust filter is installed in the upper airbox, and an supply air filter is installed in the lower airbox. When the opening and closing mechanism is closed, the upper airbox and the lower airbox are isolated, and the exhaust airflow from the fan only enters the upper airbox, without generating a downward airflow. When the opening and closing mechanism is open, a downward airflow is generated to the lower airbox. The method includes: Before opening the glass door, the air guide vane is in a horizontal position, isolating the upper air box from the lower air box. After pressing the door opening button, the glass door opens after a 10-second delay. After pressing the door opening button, the fan starts automatically immediately. The airflow from the fan only enters the upper air box, forming a negative pressure airflow surrounding the biosafety cabinet body, without generating a downward airflow, thus preventing the downward airflow from overflowing. One minute after the glass door is opened, the fan speed reaches the nominal speed. After the negative pressure in the biosafety cabinet body is sufficient, the rotating component controls the air guide vane to rotate and become vertical, generating a downward airflow. At this time, the operator can use the biosafety cabinet normally.

2. The negative pressure protection control method of a biological safety cabinet according to claim 1, wherein, Each of the rotating shafts is arranged side by side and parallel to each other, and each of the rotating shafts is rotatably connected to the cabinet body of the biosafety cabinet. The rotation axis of the rotating component is parallel to the rotation axis of the rotating shaft, and the rotating component is arranged side by side with all the rotating shafts. Each of the rotating shafts and the rotating components is connected to two air guide vanes, and the two air guide vanes are arranged in a staggered manner with respect to the rotating shaft or the rotating component; The air guide vanes located on the same side as all the rotating shafts and the rotating components are rotatably connected to a connecting shaft, and all the connecting shafts are rotatably connected to the transmission rod.

3. The method for negative pressure protection control of a biosafety cabinet according to claim 2, characterized in that, The rotating component is a rotating component composed of a motor actuator.

4. The negative pressure protection control method for a biosafety cabinet according to claim 2, characterized in that, There are two transmission rods, which are located at both ends of the connecting shaft and are rotatably connected to both ends of the connecting shaft.

5. The method for negative pressure protection control of a biosafety cabinet according to claim 1, characterized in that, The exhaust filter is located at the top of the upper air box.

6. The method for negative pressure protection control of a biosafety cabinet according to claim 1, characterized in that, The air supply filter is located at the top of the lower air box.

7. The method for negative pressure protection control of a biosafety cabinet according to claim 1, characterized in that, The biosafety cabinet has a tubular motor installed inside the air box. The tubular motor and the glass door are connected by a drive belt, and the drive belt is wound around the tubular motor.

8. The negative pressure protection control method for a biosafety cabinet according to claim 7, characterized in that, The transmission belts are at least two in number and are located at both ends of the tubular motor.

9. The negative pressure protection control method for a biosafety cabinet according to claim 7, characterized in that, Before closing the glass door, press the close button. The rotating component controls the air guide vane to rotate and be placed horizontally. The airflow from the fan outlet only enters the upper air box, forming a negative pressure airflow surrounding the safety cabinet body, without generating a downward airflow, thus preventing the downward airflow from overflowing. After pressing the close button for 10 seconds, the tubular motor controls the glass door to close automatically via the transmission belt.

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