A biosafety cabinet with a wind speed test positioning system and a test method thereof

Abstract

The application discloses a biosafety cabinet with a wind speed test positioning system and a test method thereof, which comprises a cabinet, a fan and a high-efficiency filtering device, wherein the top of the cabinet is an air outlet, the middle is a working area, and the bottom is an air exhaust channel; the air exhaust channel is communicated with a negative pressure airflow channel of the inner wall of the cabinet; and the cabinet is characterized in that a wind speed detection system is further arranged in the cabinet; the wind speed detection system comprises a grating auxiliary positioning device, a control module, a display module and a wind speed meter; the grating auxiliary positioning device is opened to form a light coordinate net; the wind speed value on the corresponding coordinate value is detected by the wind speed meter; the reason for the wind speed drop is determined by judging the size of the wind speed value, and then the problem is quickly eliminated. According to the application, the coordinate net is formed by the intersection of light beams, the detection position of the wind speed meter is accurately positioned, effective and accurate data are provided for quickly finding the reason for the wind speed drop and eliminating the fault, and the work efficiency is improved without the need of stopping and waiting and repeatedly sterilizing.

Description

Technical Field

[0001] This invention relates to a biosafety cabinet, and more particularly to a biosafety cabinet with an anemometer positioning system and its positioning method. Background Technology

[0002] Experiments conducted inside biosafety cabinets typically involve harmful microorganisms or particulate chemicals, posing certain safety risks to operators. Controlling the descent and inflow airflow velocities is crucial to protecting operators from biocontamination. Therefore, the parameters related to descent airflow are critical when using biosafety cabinets, directly determining the safety and effectiveness of the equipment.

[0003] To maintain an effective downward wind speed in real time, the equipment is equipped with a detection unit. When the wind speed becomes abnormal, such as weakening or slowing down, or even stopping, and the set parameters are not met, the controller will issue an alarm. If a downward wind speed alarm occurs during operation, the cause must be identified quickly; otherwise, operation cannot continue.

[0004] Traditional inspection methods require shutting down the machine and disinfecting the work area first, otherwise there is a safety risk to the inspectors. After disinfection and sterilization, physical measurement methods are used to arrange wind speed detection points in the work area according to the product's technical standards. Then, the machine is turned on again, and after the wind speed stabilizes, a wind speed meter is used to measure the decreasing wind speed point by point. The drawback of this operation is: The measurement efficiency is low, requiring machine downtime and manual measurement point placement; The measurement accuracy is not high, and the manual placement of measurement points is greatly affected by the environment of the testing area, such as the flatness of the work area and the skill level of the operators. Therefore, it requires professional personnel to operate. There are safety hazards; personnel entering the work area may pose a risk due to incomplete disinfection. Summary of the Invention

[0005] The purpose of this invention is to provide a biosafety cabinet with a wind speed testing and positioning system and its testing method. Through structural improvements, the equipment can automatically generate detection points, improve testing accuracy, and eliminate the need for shutdown and disinfection, thereby improving measurement safety and work efficiency.

[0006] To achieve the above objectives, the technical solution adopted by this invention is: a biosafety cabinet with a wind speed testing and positioning system, comprising a cabinet, a fan, and a high-efficiency filter. The cabinet has a clean airflow outlet at the top, a clean working area in the middle, and an exhaust duct at the bottom. The exhaust duct is connected to a negative pressure airflow duct on the inner wall of the cabinet. The cabinet also includes a wind speed detection system, which comprises a grating-assisted positioning device, a control module, and a display module. The grating-assisted positioning device includes a plurality of X-axis beam transceiver modules and a plurality of Y-axis beam transceiver modules. The X-axis beam transceiver modules are disposed in the negative pressure airflow channel inside the back panel of the working area, and the Y-axis beam transceiver modules are disposed in the negative pressure airflow channel on one side of the cabinet. The X-axis and Y-axis beam transceiver modules respectively transmit and receive beams into the working area inside the cabinet. A light-transmitting hole is provided on the inner wall of the cabinet corresponding to each transceiver module. The beams form an intersecting coordinate grid in the working area, and each intersection point is the coordinate value of the measuring point. The plane forming the coordinate grid is parallel to the air outlet. The control module receives the feedback position coordinate information from the X-axis beam transceiver module and the Y-axis beam transceiver module respectively, compares it with the measurement point position coordinate information in the reserved control module, and sends the comparison result to the display module for display and correction. The anemometer is placed in the working area during testing. Based on the information displayed by the display module, the anemometer's coordinate position in the working area is adjusted, the test results are recorded, and the results are sent to the display module for display.

[0007] In the above technical solution, the X-axis beam transceiver module and the Y-axis beam transceiver module are respectively fixed to the inner side of the outer shell or inner wall, the transmitting and receiving ports correspond to the light-transmitting holes, and the light-transmitting holes are arranged at intervals along the extension direction of the inner wall on the corresponding side, and the number of them is adapted to the length or width of the inner wall and relevant standard requirements.

[0008] In the above technical solution, each of the X-axis beam transceiver modules and the Y-axis beam transceiver modules is mainly composed of a mounting base and a transceiver. One end of the mounting base is fixed to the cabinet, and the middle is a receiving cavity. The transceiver is disposed in the receiving cavity, and its transmitting and receiving ports correspond to the light-transmitting holes.

[0009] In the above technical solution, the control module is located in the main control chip of the biosafety cabinet, and the display module is a touch display on the biosafety cabinet.

[0010] To achieve the above objectives, the method adopted by this invention is as follows: The detection method using the biosafety cabinet equipped with the wind speed detection and positioning system comprises the following steps: First, turn on the grating-assisted positioning device. The X-axis beam transceiver module and the Y-axis beam transceiver module emit beams into the working area, forming several visible intersecting coordinate grids in the working area. Each intersection point is the coordinate value of the measuring point position. Secondly, the anemometer is placed in the working area. A beam feedback signal is generated through the anemometer's obstruction coordinate network. Points where the beam is obstructed, due to accidental obstruction by the anemometer, will generate a reflected beam, which is received by the beam transceiver module. The transceiver module calculates the anemometer's position coordinates based on the strength of the received feedback signal and the distance between the obstructed point and the transceiver module, and feeds this value back to the control module. The control module compares this coordinate with pre-stored measurement point coordinates to determine the deviation, which is displayed on the screen to correct the measurement point's position. The anemometer collects the wind speed value at this point and transmits it to the control module. Then, the control module retrieves the pre-stored standard value at this location coordinate, compares the wind speed value fed back by the anemometer with the pre-stored value, analyzes the result, and sends it to the display module for display. According to the testing requirements, the mobile anemometer measures the wind speed at multiple coordinates. By comparing the wind speed at these multiple points, the cause of the biosafety cabinet's wind speed malfunction can be determined, and timely repairs can be made.

[0011] In the above technical solution, the pre-stored values ​​in the control module are the normal wind speed range at several standard positions. These standard positions are set according to the detection requirements. When the anemometer is placed within the coordinate grid, its position coordinates are fed back to the display module. The position of the anemometer is adjusted according to the displayed value so that it is placed at the standard position corresponding to the pre-stored value. Then, the anemometer is turned on to test the wind speed. The position of the anemometer is adjusted sequentially to measure the actual wind speed value corresponding to each pre-stored value. The control module compares the values ​​and outputs the results.

[0012] In the above technical solution, the biosafety cabinet is equipped with a fault sensor. When the wind speed change is detected to exceed the allowable range, a warning signal is output to the main control chip. If the fault is not eliminated after a set delay, the control module drives the grating-assisted positioning device to open automatically, prompting the operator to perform wind speed detection and troubleshoot the fault.

[0013] Due to the application of the above-mentioned technical solution, the present invention has the following advantages compared with the prior art: 1. In this invention, a grating-assisted positioning device is installed in the negative pressure airflow channel. When the wind speed in the working area becomes abnormal (such as a decrease in wind speed), the wind speed sensor main controller alarms. When it is necessary to troubleshoot the cause of the fault, the grating-assisted positioning device is activated, and X and Y axis beams are emitted to form a coordinate grid parallel to the air outlet (covering the air outlet). The anemometer is placed in the coordinate grid, and the X and Y axis beam transceiver modules measure the position coordinates of the anemometer based on the feedback signal. The anemometer measures the wind speed value at that position coordinate and sends it to the control module. The control module compares the pre-stored values, and the display module displays the results. By sequentially measuring the wind speed values ​​at multiple points in the working area, the cause of the fault can be determined. After repair, this method can also be used to check the recovery status. The entire testing process is completed by the control module, avoiding excessive manual intervention and detection errors, and providing accurate and effective data support for troubleshooting. 2. By using a beam transceiver module to form the coordinate axis, errors caused by manually pulling lines and marking detection points are avoided, thus improving detection accuracy and efficiency. At the same time, there is no need for manual insertion into the work area to lay lines and mark points, reducing safety risks caused by incomplete sterilization in the work area and improving the safety of personnel operation. 3. Since the transceiver module is located between the inner wall of the cabinet and the outer shell, and uses light as the distribution point, compared with the traditional physical measurement (wire) distribution point, the built-in transceiver module and the light distribution point will not block the normal flow direction and speed of the clean airflow in the working area. Therefore, the test positioning is more accurate and the test results are more precise. 4. The height of the plane on which the grid is located is the height permitted by the relevant standards, and the grid spacing is the measurement point location required by the relevant standards. Since the test points are located in the working area (i.e. the contaminated area) of the biosafety cabinet, it can effectively avoid the manual arrangement of measurement points before measurement and improve the safety of personnel operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the usage state of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the intersecting grid of beams along the X and Y axes; Figure 3 This is a schematic block diagram of the control system in Embodiment 1 of the present invention; Figure 4 This is an installation diagram of the transceiver module; Figure 5 This is a schematic diagram of another detachable grating-assisted positioning device. Figure 6 yes Figure 5 Enlarged schematic diagram of the slide rail structure at point A; Figure 7 yes Figure 5 A diagram illustrating the usage status; Figure 8This is a schematic diagram showing the usage state when applied to a horizontal air outlet.

[0015] The components are: 1. Cabinet; 2. Work area; 3. Grating-assisted positioning device; 4. Anemometer; 5. X-axis beam transceiver module; 6. Y-axis beam transceiver module; 7. Coordinate grid; 8. Position coordinate value; 9. Mounting base; 10. Transceiver; 11. Slide rail; 12. Slider; 13. Transceiver module; 14. Slide groove; 15. Back plate; 16. Base plate. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments: Example 1: See Figures 1-4 As shown, a biosafety cabinet with a wind speed detection and positioning system includes a cabinet 1, a fan, and a high-efficiency filter. The cabinet 1 has an air outlet at the top, a work area 2 in the middle, and an exhaust duct at the bottom. The exhaust duct is connected to a negative pressure airflow channel on the inner wall of the cabinet 1. The cabinet 1 also contains a wind speed detection system, which includes a grating-assisted positioning device 3, a control module, a display module, and a anemometer 4. The grating-assisted positioning device 3 includes a plurality of X-axis beam transceiver modules 5 and a plurality of Y-axis beam transceiver modules 6. The X-axis beam transceiver modules 5 are disposed in the negative pressure airflow channel inside the back panel 15 of the working area 2, and the Y-axis beam transceiver modules 6 are disposed in the negative pressure airflow channel on one side of the cabinet 1. The X-axis and Y-axis beam transceiver modules respectively transmit and receive beams to and from the working area 2 inside the cabinet 1. A light-transmitting hole is provided on the inner wall of the cabinet corresponding to each transceiver module. The beams form an intersecting coordinate grid 7 in the working area 2, and each intersection point is a position coordinate value 8. The coordinate grid 7 is parallel to the air outlet and covers the entire air outlet. The control module receives the feedback position coordinate information from the X-axis beam transceiver module 5 and the Y-axis beam transceiver module 6, compares it with the position coordinate information in the reserved control module, and sends the comparison result to the display module. The anemometer 4 is placed in the working area. According to the information displayed by the display module, the coordinate position of the anemometer 4 in the working area is adjusted, the test results are recorded, and sent to the display module for display.

[0017] like Figure 2 As shown, the X-axis beam transceiver module 5 and the Y-axis beam transceiver module 6 are respectively fixed to the inner side of the outer shell or inner wall. The transmitting and receiving ports correspond to the light-transmitting holes. The light-transmitting holes are arranged at intervals along the extension direction of the inner wall on their respective sides, and the number of them is adapted to the length or width of the inner wall.

[0018] like Figure 4As shown, each of the X-axis beam transceiver module 5 and the Y-axis beam transceiver module 6 is mainly composed of a mounting base 9 and a transceiver 10. One end of the mounting base 9 is fixed to the cabinet 1, and the middle is a receiving cavity. The transceiver 10 is disposed in the receiving cavity, and its transmitting and receiving ports correspond to the light-transmitting holes.

[0019] like Figure 3 As shown, the control module is located within the main control chip of the biosafety cabinet, and the display module is a touch screen on the biosafety cabinet. It is connected to the main control chip and touch screen of the equipment, eliminating the need for separate configurations and enabling unified control. This allows for better synchronization with the equipment's fault sensors. When a fault sensor detects an abnormal airflow, the main controller will issue an alarm, triggering this control module to enter detection mode.

[0020] The specific detection method is as follows: First, the grating-assisted positioning device 3 is activated. The X-axis beam transceiver module 5 and the Y-axis beam transceiver module 6 respectively emit beams into the working area 2, forming several intersecting coordinate grids 7 within the working area 2. Each intersection point represents a position coordinate value 8. Figure 2 As shown.

[0021] Next, the anemometer is placed in the working area. The beam feedback signal generated by the anemometer 4 blocking the coordinate network 7 is received by the beam transceiver module that blocks the beam. The transceiver module calculates the position coordinate value 8 of the anemometer 4 based on the strength of the received feedback signal and the distance between the blocked point and the transceiver module, and feeds it back to the control module. During this period, the display module will give a prompt, indicating whether the position of the anemometer 4 meets the detection standard. The position of the anemometer 4 can be changed or adjusted according to the prompt. The anemometer 4 collects the wind speed value at this point and transmits it to the control module. Then, the control module retrieves the pre-stored standard value at coordinate 8, compares the wind speed value fed back by the anemometer 4 with the pre-stored value, analyzes the result, and sends it to the display module for display. According to the testing requirements, the mobile anemometer 4 measured the wind speed values ​​at multiple coordinates 8. By comparing the wind speed at multiple points, the cause of the biosafety cabinet's wind speed malfunction was determined, and timely repairs were carried out.

[0022] The control module stores a range of normal wind speed values ​​at several standard locations. These standard locations are set according to the testing requirements. When the anemometer 4 is placed within the coordinate grid 7, its position coordinates 8 are fed back to the display module. The position of the anemometer 4 is adjusted according to the displayed value so that it is placed at the standard location corresponding to the stored value. Then, the anemometer 4 is turned on to test the wind speed. The position of the anemometer 4 is adjusted sequentially to measure the actual wind speed value corresponding to each stored value. The control module compares the values ​​and outputs the results.

[0023] The biosafety cabinet is equipped with a fault sensor. When a decrease in wind speed is detected, a warning signal is output to the main control chip. If the fault is not eliminated after a set delay, the control module drives the grating-assisted positioning device to open automatically, prompting the operator to stop working to detect the wind speed. After the fault is eliminated, the normal state is restored and the transceiver module is turned off.

[0024] In this embodiment, the X-axis beam transceiver module 5 and the Y-axis beam transceiver module 6 can be implemented using infrared transceiver modules, respectively.

[0025] Since the faulty sensor in the original equipment can only detect abnormal wind speed, but cannot indicate the cause of the abnormality, by using the feedback of wind speed values ​​at several standard detection points, it can be determined whether the wind speed drop is due to abnormal operation of the fan or a clogged filter that needs to be cleaned or replaced. Quickly identifying the cause of the abnormality can help to quickly eliminate the fault and restore operation.

[0026] In another embodiment, the grating-assisted positioning device is detachable, such as... Figure 5-7 As shown, in this embodiment, the X-axis beam transceiver module and the Y-axis beam transceiver module are mounted on the inner wall of the working area 2 via a slide rail 11. The base of the transceiver module 13 is a slider 12, which is slidably connected to a groove 14 on one side of the slide rail 11. The slide rail 11 is a telescopic slide rail to adapt to working areas 2 of different sizes. In this embodiment, the principle used is the same as in Embodiment 1, the difference being that it is applicable to existing biosafety cabinets. This detachable positioning device can be used when it is not possible to install a grating-assisted positioning device in the negative pressure channel or exhaust channel. The transceiver module 13 needs to be connected to the main controller via a feedback data line.

[0027] In another scenario, the cleanroom equipment has horizontal air outlets. In this case, the X-axis beam transceiver module 5 in our grating-assisted positioning device 3 needs to be installed inside the base plate 16, i.e., inside the exhaust duct. Figure 8 As shown, a coordinate grid 7 perpendicular to the base plate 16 is formed in the working area, and the detection method is the same as in Example 1.

Claims

1. A biosafety cabinet with a wind speed testing and positioning system, comprising a cabinet, a fan, and a high-efficiency filter, wherein the upper part of the cabinet is a clean air outlet, the middle part is a clean working area, and the lower part is an exhaust duct, the exhaust duct being connected to a negative pressure airflow duct on the inner wall of the cabinet, characterized in that: The cabinet is also equipped with a wind speed detection system, which includes a grating-assisted positioning device, a control module, and a display module, wherein: The grating-assisted positioning device includes a plurality of X-axis beam transceiver modules and a plurality of Y-axis beam transceiver modules. The X-axis beam transceiver modules are disposed in the negative pressure airflow channel inside the back panel of the working area, and the Y-axis beam transceiver modules are disposed in the negative pressure airflow channel on one side of the cabinet. The X-axis and Y-axis beam transceiver modules respectively transmit and receive beams into the working area inside the cabinet. A light-transmitting hole is provided on the inner wall of the cabinet corresponding to each transceiver module. The beams form an intersecting coordinate grid in the working area, and each intersection point is the coordinate value of the measuring point. The plane forming the coordinate grid is parallel to the air outlet. The control module receives the feedback position coordinate information from the X-axis beam transceiver module and the Y-axis beam transceiver module respectively, compares it with the measurement point position coordinate information reserved in the control module, and sends the comparison result to the display module for display and correction. During testing, the anemometer is placed in the work area. Based on the information displayed by the display module, the anemometer's coordinate position in the work area is adjusted, the test results are recorded, and the results are sent to the display module for display.

2. The biosafety cabinet with wind speed testing and positioning system according to claim 1, characterized in that: The X-axis beam transceiver module and the Y-axis beam transceiver module are respectively fixed to the outer shell or inner wall of the cabinet. The transmitting and receiving ports correspond to the light-transmitting holes. The light-transmitting holes are arranged at intervals along the extension direction of the inner wall on their respective sides. The number of holes is adapted to the length or width of the inner wall and the corresponding test point requirements.

3. The biosafety cabinet with wind speed testing and positioning system according to claim 1 or 2, characterized in that: Each of the X-axis beam transceiver modules and the Y-axis beam transceiver modules mainly consists of a mounting base and a transceiver. One end of the mounting base is fixed to the cabinet, and the middle is a receiving cavity. The transceiver is disposed in the receiving cavity, and its transmitting and receiving ports correspond to the light-transmitting holes.

4. The biosafety cabinet with wind speed testing and positioning system according to claim 1, characterized in that: The control module is located within the main control chip of the biosafety cabinet, and the display module is a touch screen on the biosafety cabinet.

5. The testing method for the biosafety cabinet according to claim 1 comprises the following steps: First, the grating-assisted positioning device is turned on. The X-axis beam transceiver module and the Y-axis beam transceiver module emit beams into the working area, forming several intersecting coordinate grids in the working area. Each intersection point is the coordinate value of the wind speed test position. Secondly, the anemometer is placed in the working area. The beam feedback signal is generated by the anemometer's obstruction coordinate network and received by the beam transceiver module that obstructs the beam. The transceiver module calculates the position coordinate value of the anemometer based on the strength of the received feedback signal and the distance between the obstructed point and the transceiver module, and feeds it back to the control module. The anemometer collects the wind speed value at this point and transmits it to the control module; Then, the control module retrieves the pre-stored standard value of wind speed at this location coordinate, compares the wind speed value fed back by the anemometer with the pre-stored standard value, analyzes the result, and sends it to the display module for display; and so on for the next fixed-point test. According to the testing requirements, the mobile anemometer measured the wind speed values ​​at multiple coordinates. By comparing the wind speed at multiple points to determine the cause of the biosafety cabinet's wind speed malfunction, the problem was repaired in a timely manner.

6. The test method according to claim 5, characterized in that: The control module stores a range of normal wind speed values ​​at several standard locations. These standard locations are set according to the testing requirements. When the anemometer is placed within the coordinate grid, its position coordinates are fed back to the display module. The position of the anemometer is adjusted according to the displayed value so that it is placed at the standard location corresponding to the stored value. Then, the anemometer is turned on to test the wind speed. The positions of the anemometers are adjusted sequentially to measure the actual wind speed value corresponding to each pre-stored value, which is then compared and output by the control module.

7. The test method according to claim 5, characterized in that: The biosafety cabinet is equipped with a fault sensor. When the wind speed change is detected to exceed the standard allowable range, a warning signal is output to the main control chip. If the fault is not eliminated after a set delay, the control module drives the grating-assisted positioning device to open automatically, prompting the operator to detect the wind speed and troubleshoot the fault.

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