A dual cycle clean bench

Abstract

The application relates to a double-circulation clean workbench, and relates to the technical field of laboratory workbenches. The workbench comprises a machine body, a work platform, an air duct, an outer circulation system, an inner circulation system and an air outlet system. The outer circulation system comprises a primary filter and an outer fan, so that external air is filtered through the primary filter. The inner circulation system comprises an inner fan, a main filter and a vortex inhibitor, which are arranged on the air duct and make the air passing through the outer fan pass through the main filter, the inner fan and the vortex inhibitor in sequence. An equalizing box is in communication with the air duct and makes the air in the air duct move into the equalizing box for storage. The air outlet system is in communication with the equalizing box and controls the opening to form vertical laminar flow to cover the work platform or controls the closing to stop the air flow. The primary filter and the main filter are used for filtering twice, and a certain air pressure value is formed in the equalizing box to ensure the stability of the air flow during cleaning, so that the cleaning efficiency and effect are improved.

Description

Technical Field

[0001] This application relates to the technical field of laboratory workbenches, and in particular to a dual-circulation clean workbench. Background Technology

[0002] A clean bench is an air purification device that provides a localized dust-free and sterile working environment. It can control the discharge of contaminated air from the work area through a dedicated filtration channel, avoiding harm to people and the environment. It is a safe clean bench specifically for microorganisms and is widely used in biological laboratories, medical and health care, biopharmaceutical and other related industries. It has a good effect on improving process conditions, protecting the health of operators, and improving product quality and yield.

[0003] Currently, common clean benches mainly employ two technical solutions: one is a single-circulation vertical laminar flow system, which directly processes external air through a high-efficiency filter to form a unidirectional flow; the other is an external circulation auxiliary system, which maintains external airflow circulation through an independent fan. The advantages of the first solution are its simple structure and low cost, but the high-efficiency filter is prone to saturation and requires frequent replacement. The second solution reduces the burden on the main filter through external circulation, but it suffers from unstable airflow organization and large fluctuations in the cleanliness of the operating area. Therefore, improving the cleanliness effect is an urgent problem to be solved. Summary of the Invention

[0004] To improve the cleaning effect, this application provides a dual-circulation clean bench.

[0005] This application provides a dual-circulation clean bench, which adopts the following technical solution:

[0006] A dual-circulation clean bench includes a body, a work platform, an air duct, an external circulation system, an internal circulation system, and an air outlet system;

[0007] The external circulation system includes:

[0008] The pre-filter and the external fan are installed in the air duct so that the outside air is filtered through the pre-filter before being moved to the external fan.

[0009] The internal circulation system includes:

[0010] An internal fan, a main filter, and a vortex suppressor are installed on the air duct so that the air passing through the external fan is filtered by the main filter and then passes through the internal fan and the vortex suppressor in sequence.

[0011] The equalizing pressure box is installed on the machine body and connected to the air duct, allowing the air in the air duct to be moved into the equalizing pressure box for storage; the air outlet system is connected to the equalizing pressure box and can be controlled to open to form a vertical laminar flow covering the working platform or to close the air flow.

[0012] By adopting the above technical solution, the external fan starts, allowing outside air to be drawn in after being filtered through the pre-filter. The air then moves to the main filter for further filtration after passing through the external fan. The air then enters the equalization box for storage through the internal fan and eddy current suppressor, creating a certain air pressure value in the equalization box. The air outlet system is then opened, outputting vertical laminar flow to cover the work platform, thereby achieving the goal of cleaning the work platform.

[0013] By performing filtration twice, with a pre-filter and a main filter, the risk of saturation from relying on a single filter structure is reduced, thus improving cleaning effectiveness and efficiency. By creating a certain air pressure value within the equalizing chamber, the airflow stability during cleaning is ensured, reducing the risk of unstable airflow and large fluctuations in cleanliness. Furthermore, vertical laminar flow enables better cleaning of the work platform. Moreover, this application has a simple structure, low cost, and improves cleaning efficiency and effectiveness.

[0014] Optionally, the air outlet system includes:

[0015] The air outlet duct is installed on the unit body and connected to the pressure equalization box;

[0016] Air outlet component, controls the opening and closing of the air outlet duct;

[0017] A baffle is installed on the air outlet duct and is used to form a vertical laminar flow coverage work platform;

[0018] The sterilization component is located between the air outlet component and the baffle. After the air outlet component controls the air outlet pipe to open, the sterilization component is activated to sterilize the passing air. The air outlet component controls the air outlet pipe and the sterilization component to close simultaneously.

[0019] By adopting the above technical solution, the air outlet duct is connected to the pressure equalization box, so that the air outlet duct maintains a certain air pressure. When cleaning is required, the air outlet component controls the air outlet duct and the sterilization component to open simultaneously. The air is sterilized by the sterilization component and then output as a vertical laminar flow to cover the work platform. After cleaning is completed, the air outlet component controls the air outlet duct and the sterilization component to close simultaneously, thereby realizing the output of sterilized air to clean the work platform. At the same time, the sterilization component can be turned on again when outputting air and turned off in time after the air delivery is completed, thereby improving the cleaning effect and efficiency and reducing energy consumption.

[0020] Optionally, it may also include a control component, the control component comprising:

[0021] The control unit is installed on the air duct and located between the main filter and the external fan, and is used to control the connection or disconnection of the external circulation system and the internal circulation system.

[0022] The air outlet pipe is connected to the air duct located between the external fan and the control unit, and is inclined upward and equipped with an air outlet valve for controlling its opening and closing.

[0023] The detection device measures the airflow rate in the duct and issues an alarm when the flow rate falls below a specified value. Before startup, the control device disconnects the external and internal circulation systems, the external fan starts, and the air is collected and output through the outlet pipe. The detection device measures the airflow rate and issues an alarm when the flow rate falls below a specified value, prompting the pre-filter to be cleaned.

[0024] By adopting the above technical solution, before startup, the control unit disconnects the external circulation system and the internal circulation system, the external fan starts, and air enters the air duct through the pre-filter. Then, the air gathers in the space between the control unit and the outlet pipe, and the gathered air tilts upward and enters the outlet pipe for discharge. The detection unit can detect the air flow rate. If the value is greater than the specified value, it indicates that the pre-filter is in normal condition; if the flow rate is less than the specified value, it indicates that the pre-filter is saturated and needs to be cleaned. The staff cleans the impurities on the pre-filter. After cleaning, the detection unit continues to detect until the detection value meets the requirements, thereby achieving the pre-cleaning of the external circulation system.

[0025] After a period of pre-cleaning, the control unit connects the external and internal circulation systems, starts the internal fan and closes the exhaust valve, causing the external and internal fans to start simultaneously. The filtered air is then moved to the equalizing chamber for storage. Because the exhaust pipe is tilted upwards, it is difficult for air to enter the exhaust pipe when the external and internal fans are running. At the same time, the closed exhaust valve also prevents outside air from entering and causing contamination, thus further improving the cleaning effect and saving energy.

[0026] Optionally, the air duct is provided with a cleaning mechanism for cleaning the pre-filter, the cleaning mechanism comprising:

[0027] The brush plate is slidably installed on the air duct and located on the side of the pre-filter near the external fan, and is used to clean the impurities on the pre-filter;

[0028] The movable component is connected to the air outlet pipe and the air duct, and the brush plate is driven to move for cleaning under the action of air flow. After the control component controls the external circulation system and the internal circulation system to disconnect, the external fan is started to discharge the air in the air duct and drive the brush plate to move.

[0029] Fixed plate one and fixed plate two are installed on the air duct. The primary filter is located between fixed plate one and fixed plate two. Fixed plate one has a cleaning hole one and an air jet hole one spaced apart vertically on the side wall of the side near the primary filter. Fixed plate two has a cleaning hole two and an air jet hole two corresponding to the cleaning hole one and the air jet hole one, respectively. The cleaning hole one is located below the air jet hole one and is connected to the air outlet pipe.

[0030] The fixed plate 2 has an air intake chamber that communicates with the cleaning hole 2 and the jet hole 2. The bottom of the fixed plate 2 has an air intake channel that communicates with the air duct located above the external fan and the air intake chamber. The air intake chamber and the air intake channel work together to generate an adsorption force at the cleaning hole 2 and the jet hole 2.

[0031] The collection component is detachably mounted on the fixed plate 2 and extends into the air intake chamber; the cleaning hole 1 sprays out gas and draws in gas, causing the impurities cleaned by the brush plate to move to the collection component for collection; the cleaning hole 2 sprays out gas and draws in gas, forming a gas flow to block the impurities from moving upward.

[0032] By adopting the above technical solution, during pre-cleaning, air in the air duct enters the air outlet pipe. The air in the air outlet pipe pushes the brush plate to move through the moving component, causing impurities on the pre-filter to fall off. At the same time, air is ejected through cleaning hole one and jet hole one. The air flow in the air duct also passes through the air intake chamber and air intake channel, causing cleaning hole two and jet hole two to generate suction force and draw in air. Cleaning hole one and cleaning hole two form the first layer of airflow, which moves the fallen impurities to the collection component for collection. Jet hole one and jet hole two form the second layer of airflow, which can simultaneously push impurities to the collection component. The second layer of airflow is above the first layer of airflow, which can block impurities from passing through the second layer of airflow, further improving the cleaning effect of impurities and reducing the risk of impurities drifting into the environment.

[0033] After pre-cleaning is completed, the control unit connects the external circulation system and the internal circulation system. As a result, the airflow in the duct pushes the brush plate back to its original position. Therefore, the pre-cleaning can automatically clean the pre-filter, reducing the risk of pre-filter saturation, further improving the cleaning effect, and saving energy.

[0034] Optionally, a movable groove is formed on the inner wall of the air duct and below the primary filter, and the brush plate is slidably mounted on the movable groove via a movable block; the movable component includes:

[0035] An upward-facing air supply pipe is installed on the air outlet pipe located between the air outlet valve and the air duct, and is inclined upward.

[0036] A downward air supply pipe is installed on the air duct and connected to the internal circulation system, and is inclined downward. The upward air supply pipe and the downward air supply pipe are connected to both ends of the moving slot and realize the reciprocating movement of the driving moving block.

[0037] Two elastic sealing plates are installed on the air duct and located on the upper and lower sides of the moving groove. The two elastic sealing plates press against the moving block or press against each other under the action of elasticity and are used to prevent gas from overflowing from the moving groove.

[0038] By adopting the above technical solution, during pre-cleaning, the air outlet valve is opened, and the gas entering the air outlet pipe can be ejected through the jet hole 1 and the cleaning hole 1. At the same time, part of the gas in the air outlet pipe enters the moving groove through the upward air supply pipe, pushing the moving block to move the brush plate. Meanwhile, when the two elastic plates are not in contact with the moving block, they press against each other to seal, or the two elastic plates press against the moving block for positioning, thereby reducing the risk of gas moving out of the moving groove and ensuring the pushing effect on the brush plate.

[0039] After pre-cleaning, the amount of gas entering through the exhaust pipe decreases, and the exhaust valve is closed. The gas in the duct can enter the other end of the moving slot through the downward air supply pipe, thereby pushing the brush plate back to its original position. At the same time, the gas in the moving slot can also move back into the duct through the upward air supply pipe and the exhaust pipe, thus automatically moving the brush plate, improving the cleaning effect, and saving energy.

[0040] Optionally, the fixing plate two has a mounting hole communicating with the suction chamber, and the collection assembly includes:

[0041] The collection frame is detachably mounted on the second fixing plate and extends through the mounting hole into the air intake chamber;

[0042] A collection net is set on the collection frame to allow air to pass through and collect impurities.

[0043] By adopting the above technical solution, impurities enter the intake chamber through cleaning hole two and / or jet hole two, and then the impurities are collected through the collection net. At the same time, the collection frame can be removed to clean the collection net, which improves the cleaning effect of the pre-filter.

[0044] Optionally, an installation space is formed inside the machine body and around the air duct for installing parts inside the machine body. The primary filter is detachably installed on the air duct. A vertical slide is provided on the air duct. Two mounting plates are vertically spaced and slidably installed on the slide. The external fan and the internal fan are respectively installed on the two mounting plates. A lifting ring for moving the mounting plate is threaded on the highest mounting plate. Alternatively, the lifting ring is threaded to the two mounting plates and realizes the movement of the two mounting plates.

[0045] By adopting the above technical solution, the installation space is located around the air duct, which can make better use of space, making the workbench structure more compact and smaller in size.

[0046] The outdoor fan, indoor fan, and HEPA filter are all consumable parts that require regular inspection and maintenance. When only the outdoor fan needs to be inspected, the pre-filter is removed, and the mounting plate at the highest point is lifted out using lifting rings to access the outdoor fan. If the indoor fan needs to be inspected, the lifting rings are rotated to connect the two mounting plates, which can then be removed to access the indoor fan. The HEPA filter can also be fixedly installed on the mounting plate as needed, allowing it to be removed for inspection. This allows for the inspection of consumable parts without entering the machine body, greatly improving maintenance efficiency.

[0047] Optionally, the baffle is provided with a plurality of ventilation holes for air to pass through at intervals, the baffle is reciprocatingly slidable on the air outlet pipe, and the body is provided with a drive mechanism for driving the baffle to reciprocate.

[0048] By adopting the above technical solution, if the work platform needs to be covered, the ventilation holes on the baffle will be large. When the work platform is not in use, the large ventilation holes will make it easy for external impurities and debris to enter, thus reducing the cleaning effect. Multiple evenly arrayed ventilation holes can greatly block the entry of impurities and debris, but they can also easily create clean blank areas, that is, clean air is difficult or less likely to reach, thus reducing the cleaning effect.

[0049] By driving the baffle to move back and forth through the drive mechanism, the air output area can be increased, reducing the risk of creating a clean blank area on the work platform. At the same time, it reduces the risk of impurities and debris entering the air outlet duct, thereby improving the cleaning effect.

[0050] Optionally, the drive mechanism includes:

[0051] The movable disc is rotatably mounted on the machine body via a rotating shaft and has an eccentrically positioned moving rod.

[0052] The connecting rod is rotatably connected to the moving rod and the baffle, respectively.

[0053] The drive component is connected to the air outlet duct and drives the movable disk to rotate. When there is air flow in the air outlet duct, the movable component drives the rotating shaft to rotate.

[0054] By adopting the above technical solution, air enters the air outlet duct and is output through multiple ventilation holes. At the same time, the air flow in the air outlet duct drives the rotating shaft to rotate through the moving component. The rotation of the rotating shaft drives the rotating disk to rotate. The rotation of the rotating disk drives the moving rod to rotate around the axis of the moving disk. The rotation of the moving rod drives the baffle to move back and forth through the connecting rod.

[0055] Compared to conventional drive structures, using airflow to drive the baffle reciprocating reduces structural complexity and instability caused by damage, while also saving energy. Furthermore, airflow-driven operation reduces the pushing force of the gas on the baffle, thus slowing down its reciprocating movement and reducing the risk of airflow deviation through multiple ventilation holes due to excessive speed. Even with reciprocating oscillation, it ensures vertical laminar flow coverage of the work platform, thereby further improving the cleanliness.

[0056] Meanwhile, when the air outlet duct closes to output gas, the moving component automatically shuts off the baffle drive, ensuring stable operation of the entire structure and further improving the cleaning effect.

[0057] Optionally, the driving component includes:

[0058] A movable cylinder is mounted on the machine body. The rotating shaft extends coaxially into the movable cylinder and is rotatably connected to the movable cylinder. Multiple pushing plates are arranged in a circumferential array around the axis of the rotating shaft. Two adjacent pushing plates cooperate with the inner sidewall of the movable cylinder to form a pushing cavity.

[0059] The input pipe and output pipe are set on the moving cylinder and are connected to the two pushing chambers and the air outlet pipe, so that the air in the air outlet pipe enters the pushing chamber to drive the pushing plate to rotate and then flows back into the air outlet pipe.

[0060] By adopting the above technical solution, the gas located in the air outlet pipe can be input through the input pipe to drive the drive plate in the cavity to rotate. As the gas moves, it is output through the output pipe and flows back into the air outlet pipe, which can continuously drive the rotating shaft to rotate. At the same time, when the gas in the air outlet pipe is closed, the baffle drive is automatically closed.

[0061] In summary, this application includes at least one of the following beneficial technical effects:

[0062] 1. By performing filtration twice, through a pre-filter and a main filter, the risk of saturation from relying on a single filter structure is reduced, thus improving cleaning effectiveness and efficiency. By creating a certain air pressure value within the equalizing chamber, the airflow stability during cleaning is ensured, reducing the risk of unstable airflow and large fluctuations in cleanliness. Furthermore, vertical laminar flow enables better cleaning of the work platform. Moreover, this application has a simple structure and low cost, improving cleaning efficiency and effectiveness.

[0063] 2. The external and internal circulation systems are disconnected via the control unit, the external fan starts, and air enters the outlet pipe at an angle after passing through the pre-filter. The detection unit can detect the air flow rate. If the flow rate is less than a specified value, an alarm will be triggered. Staff clean the impurities on the pre-filter to achieve pre-cleaning of the external circulation system. After pre-cleaning, the control unit connects the external and internal circulation systems, and the internal and external fans start simultaneously, thus further improving the cleaning effect and saving energy.

[0064] 3. During pre-cleaning, air in the duct is ejected through cleaning hole one and jet hole one, while cleaning hole two and jet hole two draw in air. Cleaning hole one and cleaning hole two form the first layer of airflow, causing fallen impurities to be moved into the collection component for collection. Jet hole one and jet hole two form the second layer of airflow, which simultaneously pushes impurities to the collection component. The second layer of airflow is located above the first layer of airflow, thus blocking impurities from passing through the second layer of airflow, further improving the cleaning effect of impurities and reducing the risk of impurities drifting into the environment, further improving the cleaning effect and saving energy. Attached Figure Description

[0065] Figure 1 This is a three-dimensional structural diagram of the workbench embodiment 1;

[0066] Figure 2 yes Figure 1 A cross-sectional schematic diagram of AA in the middle;

[0067] Figure 3 yes Figure 2 Enlarged diagram of section B;

[0068] Figure 4 This is a three-dimensional structural diagram of the workbench in embodiment 2;

[0069] Figure 5 This is a partial structural diagram of embodiment 2 of the workbench, mainly showing the cleaning mechanism;

[0070] Figure 6 This is a partial structural diagram of embodiment 2 of the workbench, mainly showing the air outlet system and drive mechanism;

[0071] Figure 7 yes Figure 5 A cross-sectional view of CC.

[0072] Figure 8 yes Figure 7 Enlarged schematic diagram of section E in the middle;

[0073] Figure 9 yes Figure 5 A cross-sectional schematic diagram of DD;

[0074] Figure 10 yes Figure 9 Enlarged schematic diagram of section F in the middle;

[0075] Figure 11 This is a partial structural schematic diagram of the workbench embodiment 2, mainly showing the drive mechanism, with a cross-sectional view of the bottom of the moving cylinder.

[0076] Reference numerals: 1. Body; 11. Housing; 12. Support leg; 13. Working platform; 14. Air duct; 15. Slide rail; 16. Mounting plate; 17. Lifting ring; 18. Rotating shaft; 19. Control hole; 2. External circulation system; 21. Primary filter; 22. External fan; 3. Internal circulation system; 31. Internal fan; 32. Main filter; 33. Vortex suppressor; 34. Pressure equalization box; 4. Air outlet system; 41. Air outlet duct; 42. Air outlet component; 43. Baffle; 44. Sterilization component; 5. Control components; 51. Control component; 511. Control door; 512. Driver; 52. Air outlet duct; 53. Detection component; 54. Air outlet valve; 6. Cleaning mechanism; 61. Hair 611. Brush plate; 612. Moving slot; 613. Moving block; 62. Fixed plate one; 624. Air inlet chamber; 63. Fixed plate two; 64. Cleaning hole one; 65. Cleaning hole two; 66. Air jet hole one; 67. Air jet hole two; 68. Inhalation chamber; 69. Inhalation duct; 7. Moving assembly; 71. Upward air supply pipe; 72. Downward air supply pipe; 73. Elastic sealing sheet; 8. Collection assembly; 81. Collection frame; 82. Collection net; 83. Collection plate; 84. Mounting hole; 9. Drive mechanism; 91. Moving disc; 92. Connecting rod; 93. Drive assembly; 94. Moving cylinder; 95. Input pipe; 96. Output pipe; 97. Push chamber; 98. Push plate; 99. Moving rod. Detailed Implementation

[0077] The following provides a further detailed description of this application.

[0078] This application discloses a dual-circulation clean bench.

[0079] Example 1, referring to Figure 1 and Figure 2 The dual-circulation clean bench includes a body 1, a work platform 13, an air duct 14, an external circulation system 2, an internal circulation system 3, and an exhaust system 4.

[0080] The body 1 includes a housing 11 and a support foot 12 fixedly installed on the lower surface of the housing 11. The work platform 13 is fixedly installed on the support foot 12 and is in a horizontal state. A fixing hole is opened on the upper surface of the housing 11. The top end of the air duct 14 is fixedly installed on the fixing hole and extends vertically downward into the housing 11. The housing 11 and the surrounding area of ​​the air duct 14 form an installation space for installing parts inside the housing 11.

[0081] The external circulation system 2 includes a pre-filter 21 and an external fan 22. The pre-filter 21 is fixedly installed on the top of the air duct 14 by screws and covers the entire air duct 14 to filter the air entering the air duct 14 from the outside. The external fan 22 is fixedly installed on the inner wall of the air duct 14 and located below the pre-filter 21. The external fan 22 causes the outside air to be filtered through the pre-filter 21, and then the air moves to the external fan 22 and continues to move downward.

[0082] The internal circulation system 3 includes an internal fan 31, a main filter 32, a vortex suppressor 33, and a pressure equalization box 34. The main filter 32, the internal fan 31, and the vortex suppressor 33 are vertically spaced and fixedly installed in the air duct 14. The main filter 32 is located at the highest point and below the external fan 22. When the internal fan 31 is activated, the air at the external fan 22 moves downward and is filtered by the main filter 32. The main filter 32 is a high-efficiency filter and is the primary filter. The vortex suppressor 33 suppresses the vortices formed by the air. The vortex suppressor 33 is existing technology and will not be described in detail here. The pressure equalization box 34 is fixedly installed on the inner side wall of the box 11, and the bottom end of the air duct 14 is fixedly connected to the upper surface of the box 11. The gas in the air duct 14 is moved into the pressure equalization box 34 for storage and to form a certain air pressure.

[0083] The air supply system 4 includes an air supply duct 41, an air supply component 42, a baffle 43, and a sterilization component 44. The air supply duct 41 is fixedly installed on the lower surface of the pressure equalization box 34, and the air supply duct 41 vertically passes through the inner bottom wall of the box 11 and extends to be flush with the lower surface of the box 11. The air supply duct 41 is connected to the inside of the pressure equalization box 34. The air supply component 42 is fixedly installed on the air supply duct 41 and is used to control the connection or closure of the air supply duct 41. The air supply component 42 can be a valve structure. The baffle 43 is fixedly installed on the bottom of the air supply duct 41, and multiple elongated ventilation holes are horizontally spaced on the baffle 43. The sterilization component 44 is fixedly installed inside the air supply duct 41 and is located between the baffle 43 and the air supply component 42.

[0084] When the air outlet component 42 is activated and the air outlet duct 41 is opened, the gas in the equalizing box 34 enters the air outlet duct 41 under the action of air pressure. At the same time, the sterilization component 44 is activated to sterilize and disinfect the passing air. The sterilized air generates a vertical downward airflow through multiple ventilation holes, which can form a vertical laminar flow to cover the work platform 13, thereby achieving cleanliness. After the cleaning is completed, the air outlet component 42 closes the air outlet duct 41, and the sterilization component 44 stops.

[0085] Reference Figure 2 and Figure 3It also includes a control component 5, which includes a control element 51, an air outlet pipe 52, and a detection element 53. The control element 51 is installed on the air duct 14 and located between the external fan 22 and the main filter 32. The control element 51 is used to control the opening or closing of the air duct 14. The control element 51 includes a control door 511 and an actuator 512. A control hole 19 is provided on the air duct 14. The control door 511 slides horizontally through the air duct 14. The actuator 512 is an electric actuator rod. The actuator 512 is fixedly installed on the outer wall of the air duct 14 and the piston rod is connected to the control door 511. The actuator 512 drives the control door 511 to open, thereby connecting the external circulation system 2 and the internal circulation system 3. Alternatively, the actuator 512 drives the control door 511 to move back and close, thereby disconnecting the external circulation system 2 and the internal circulation system 3, and also blocking the gas from flowing out of the equalizing box 34.

[0086] The air outlet pipe 52 is fixedly installed on the outer wall of the air duct 14 and is connected to the air duct 14 located between the external fan 22 and the control component 51. The air outlet pipe 52 is inclined upward and is equipped with an air outlet valve 54 for controlling its opening and closing. The detection component 53 is fixedly installed inside the air outlet pipe 52 and is used to detect the air flow rate through the air outlet pipe 52. An alarm light electrically connected to the detection component 53 is fixedly installed on the upper surface of the housing 11. When the detected flow rate is less than a specified value, the alarm light will sound an alarm to remind the staff to clean the pre-filter 21, thereby improving the cleaning effect.

[0087] The working principle of this application embodiment is as follows:

[0088] Control unit 51 closes the air duct 14, air outlet valve 54 opens, and outdoor fan 22 starts. Outside air is filtered through primary filter 21 and then gathers between primary filter 21 and control unit 51. The air is then output through air outlet pipe 52 to achieve pre-cleaning. At the same time, detection unit 53 detects the air flow. When the flow is less than a specified value, detection unit 53 activates an alarm to remind staff to clean primary filter 21. When the flow reaches the specified value, detection unit 53 stops alarming, and outdoor fan 22 continues to run until pre-cleaning is complete.

[0089] After pre-cleaning, the exhaust valve 54 is closed and the control unit 51 opens the air duct 14. The internal fan 31 is also started, so that the external fan 22 and the internal fan 31 start simultaneously. This causes the air that has moved to the external fan 22 to continue to move downward, passing through the main filter 32, the internal fan 31 and the eddy current suppressor 33 in sequence before entering the equalization box 34 for storage, so that a certain pressure of gas is formed in the equalization box 34. The exhaust component 42 opens the exhaust pipe 41 and the sterilization component 44 is activated. After the air in the equalization box 34 is sterilized, it forms a vertical laminar flow that covers the working platform 13 through multiple ventilation holes, making the airflow output more stable and improving the cleaning effect.

[0090] Example 2, refer to Figures 4-6 The difference between this embodiment and embodiment 1 is that the top of the air duct 14 extends above the housing 11, and a cleaning mechanism 6 is provided on the air duct 14. During pre-cleaning, the air in the air outlet pipe 52 flows through the cleaning mechanism 6 to clean the impurities adhering to the primary filter 21. The baffle 43 is reciprocally slidably disposed on the air outlet pipe 41, and a drive mechanism 9 for driving the baffle 43 to reciprocate is provided on the body 1.

[0091] Reference Figure 4 , Figure 7 A vertical slide rail 15 is provided on the side wall of the air duct 14 parallel to the moving direction of the control door 511. The slide rail 15 is connected to the top of the air duct 14. Two mounting plates 16 are vertically slid and stacked on the slide rail 15. The external fan 22 is fixedly installed on the mounting plate 16 at the highest position. The main filter 32, the internal fan 31 and the eddy current suppressor 33 are fixedly installed on another mounting plate 16. Two lifting rings 17 are provided at intervals on the mounting plate 16 at the highest position. The lifting rings 17 are vertically threaded to the upper surface of the mounting plate 16, and the bottom end of the lifting rings 17 is threaded to the second mounting plate 16.

[0092] When the highest mounting plate 16 needs to be moved for maintenance of the internal fan 31, it can be lifted from the top of the duct 14 using two lifting rings 17. If the second mounting plate 16 needs to be moved, the lifting rings 17 are rotated downwards to connect the two mounting plates 16 to each other, thus enabling the simultaneous lifting of both mounting plates 16 and improving the convenience of maintenance of the internal fan 31, main filter 32, and eddy current suppressor 33.

[0093] Reference Figure 5 , Figure 7 , Figure 8 The cleaning mechanism 6 includes a brush plate 61 and a moving assembly 7. A horizontal moving groove 611 is provided on the inner wall of the air duct 14, below the pre-filter 21 and at the top of the air duct 14. The moving groove 611 and the slide rail 15 are arranged opposite to each other. The brush plate 61 is slidably mounted on the moving groove 611 via a moving block 612. The moving block 612 and the moving groove 611 slide together and are both T-shaped. The moving block 612 extends outside the moving groove 611, and the brush on the brush plate 61 extends into the pre-filter 21. The brush plate 61 moves to clean the pre-filter 21.

[0094] The moving component 7 is connected to the air outlet pipe 52 and the air duct 14, and drives the brush plate 61 to move under the action of air flow in the air outlet pipe 52 and the air duct 14, thereby cleaning the primary filter 21; after the control component 51 controls the external circulation system 2 and the internal circulation system 3 to disconnect, the external fan 22 starts to discharge the air in the air outlet pipe 52 and drives the brush plate 61 to move; after the control component 51 controls the external circulation system 2 and the internal circulation system 3 to connect, the external fan 22 and the internal fan 31 start simultaneously and drive the brush plate 61 to move back.

[0095] Reference Figure 5 , Figures 7-9 The moving component 7 includes an upward air supply pipe 71, a downward air supply pipe 72, and two elastic sealing plates 73. One end of the upward air supply pipe 71 is fixedly installed on the air outlet pipe 52 located between the air duct 14 and the air outlet valve 54. The upward air supply pipe 71 is inclined upward through the housing 11 and extends to the top of the air duct 14. One end of the downward air outlet pipe 52 is fixedly installed on the outer wall of the air duct 14, and is inclined downward before vertically upward through the housing 11 and extending to the top of the air duct 14. One end of the upward air supply pipe 71 and the downward air supply pipe 72 are respectively fixedly installed on the top outer wall of the air duct 14 and are respectively connected to both ends of the moving slot 611.

[0096] Two elastic sealing pieces 73 are fixedly installed on the inner wall of the air duct 14. The two elastic sealing pieces 73 are located on the upper and lower sides of the moving groove 611 and are arranged along the sliding direction of the brush plate 61. The two elastic sealing pieces 73 cover the moving groove 611 along the length direction. The two elastic sealing pieces 73 are in a figure-eight shape and press against the moving block 612 respectively for sealing. Alternatively, the elastic sealing pieces 73 that are not in contact with the moving block 612 press against each other for sealing, thereby preventing air from escaping from the moving groove 611.

[0097] During pre-cleaning, control unit 51 closes air duct 14, and external fan 22 starts. Air enters moving slot 611 through air outlet pipe 52 and upward air supply pipe 71, pushing moving block 612 and brush plate 61 to move. The gas in moving slot 611 is fed into air duct 14 through downward air supply pipe 72. The amount of air in moving slot 611 is small and sealed, so it will not cause impurities to contaminate air duct 14. This is used to clean the impurities on the pre-filter 21 until moving block 612 is positioned against one end of moving slot 611.

[0098] After pre-cleaning, the control unit 51 opens the air duct 14, the internal fan 31 and the external fan 22 start simultaneously, and the air outlet valve 54 closes. Since the air outlet pipe 52 is inclined upward, less gas enters the air outlet pipe 52. At the same time, the air in the air duct 14 moves vertically downward. Since the downward air supply pipe 72 is inclined downward, some of the gas in the air duct 14 can enter the moving groove 611 through the downward air supply pipe 72, thereby pushing the brush plate 61 back to its original position. At the same time, the gas in the moving groove 611 is input into the air duct 14 through the upward air supply pipe 71 and the air outlet pipe 52, thereby realizing the automatic movement of the brush plate 61 during pre-cleaning and pushing the brush plate 61 back after pre-cleaning, so as to facilitate the subsequent cleaning of the pre-filter 21.

[0099] Reference Figure 5 , Figure 9 and Figure 10 The cleaning mechanism 6 also includes a first fixing plate 62 and a second fixing plate 63 and a collection assembly 8. The first fixing plate 62 and the second fixing plate 63 are respectively fixedly installed on opposite side walls at the top of the air duct 14 and extend vertically upward to above the primary filter 21. The sliding direction of the brush plate 61 is perpendicular to the opposite side walls of the first fixing plate 62 and the second fixing plate 63. The primary filter 21 is located between the first fixing plate 62 and the second fixing plate 63 and abuts against the opposite side walls of the first fixing plate 62 and the second fixing plate 63.

[0100] On the side wall of the fixing plate 62 near the primary filter 21, there are elongated cleaning holes 64 and air jet holes 66 spaced vertically. On the fixing plate 63, there are cleaning holes 65 and air jet holes 67 that correspond to cleaning holes 64 and air jet holes 66, respectively. Cleaning holes 64 and 65 are arranged correspondingly, and air jet holes 66 and 67 are arranged correspondingly. Cleaning hole 64 is located below air jet hole 66. Cleaning holes 64 and 66, and cleaning holes 65 and 67 are all elongated structures that cover the entire primary filter 21 in the length direction.

[0101] One end of the air outlet pipe 52 is fixedly connected to the side wall of the fixing plate 62. The fixing plate 62 has an air inlet chamber 621 that connects the air outlet pipe 52, the cleaning hole 64 and the jet hole 66, so that the air in the air outlet pipe 52 is ejected through the cleaning hole 64. The brush plate 61 moves to make the impurities on the primary filter 21 fall off. Air is ejected through the cleaning hole 64. The lowest point of the cleaning hole 64 and the second cleaning hole 65 is flush with the upper surface of the primary filter 21, which makes it easier to push the impurities on the primary filter 21 toward the second cleaning hole 65.

[0102] The fixed plate 63 has an air intake chamber 68 that connects to the cleaning hole 65 and the jet hole 67. The bottom of the fixed plate 63 is provided with an air intake duct 69 that connects to the air intake chamber 68 and is inclined downward to connect to the air duct 14. At the same time, the connection between the air intake duct 69 and the air duct 14 is located above the external fan 22. When the external fan 22 is started, the air flows downward, which also causes the air in the air intake duct 69 and the air intake chamber 68 to flow downward, so that the cleaning hole 65 and the jet hole 67 are generated with suction force.

[0103] The collection component 8 is detachably mounted on the fixed plate 63 and extends into the suction chamber 68 to collect impurities. The cleaning hole 64 sprays gas and draws in gas, causing impurities on the brush plate 61 to move toward the collection component 8 until they are collected. The jet hole 66 sprays gas and the jet hole 67 draws in gas, creating a blocking airflow above the primary filter 21 to prevent impurities cleaned by the brush plate 61 from rising and escaping into the air, causing pollution. At the same time, the gas flow also pushes impurities toward the collection component 8, thereby greatly improving the cleaning effect on the primary filter 21, improving the cleaning effect, and saving energy.

[0104] The mounting plate 63 has a mounting hole 84 on its side wall opposite to the primary filter 21, which communicates with the air intake chamber 68. The collection assembly 8 includes a collection frame 81 and a collection net 82. The collection frame 81 is horizontally slidably mounted on the mounting hole 84, and a collection plate 83 is fixedly mounted on the collection frame 81 and positioned against the mounting plate. The collection net 82 is fixedly mounted on the lower surface of the collection frame 81, and the collection net 82 allows air to pass through while blocking impurities, thereby filtering and collecting impurities. The height of the mounting hole 84 is greater than the thickness of the collection frame 81, and it is convenient to remove the collection net 82 when the collection frame 81 is removed, so that the air entering the air intake chamber 68 is filtered by the collection net 82 and enters the air intake channel 69.

[0105] Reference Figure 4 , Figure 6 , Figure 11 The drive mechanism 9 includes a movable disk 91, a connecting rod 92, and a drive assembly 93. A vertical rotating shaft 18 is rotatably mounted on the lower surface of the housing 11 on one side of the baffle 43, with one end of the rotating shaft 18 extending into the housing 11. The movable disk 91 is coaxially fixedly mounted on the bottom end of the rotating shaft 18, and a movable rod 99 is eccentrically fixedly mounted on the lower surface of the movable disk 91. The axes of the movable rod 99 and the movable disk 91 are parallel. The two ends of the connecting rod 92 are rotatably connected to the movable rod 99 and the lower surface of the baffle 43, respectively.

[0106] The drive assembly 93 is connected to the air outlet duct 41 and drives the rotating shaft 18 to rotate. When there is air flow in the air outlet duct 41, the rotating shaft 18 is driven to rotate through the moving assembly 7. The drive assembly 93 includes a moving cylinder 94, an input pipe 95 and an output pipe 96. The moving cylinder 94 is fixedly installed on the bottom wall of the housing 11, and the rotating shaft 18 coaxially passes through the moving cylinder 94 and extends into the moving cylinder 94 and abuts against the top wall of the moving cylinder 94. A push plate 98 is fixedly installed on the rotating shaft 18 and contacts the top wall and bottom wall of the moving cylinder 94. The push plate 98 also abuts against the inner side wall of the moving cylinder 94. At the same time, multiple push plates 98 are arranged in a circumferential array around the rotating shaft 18. Two adjacent push plates 98 and the side wall of the moving cylinder 94 cooperate to form a push cavity 97.

[0107] The input pipe 95 and the output pipe 96 are fixedly installed on the side wall of the movable cylinder 94. The input pipe 95 is inclined upward and the output pipe 96 is inclined downward, and both are fixedly connected to the air outlet pipe 52 located below the air outlet component 42. The input pipe 95 and the output pipe 96 are respectively connected to two different push chambers 97. When the air outlet component 42 opens to output air, the gas enters the push chamber 97 through the input pipe 95, driving the push plate 98 and the rotating shaft 18 to rotate. Then the gas flows back to the air outlet pipe 41 through the output pipe 96 at an angle downward. The rotation of the rotating shaft 18 drives the movable disk 91 to rotate. The movable disk 91 drives the baffle 43 to move back and forth through the moving rod 99 and the connecting rod 92, while controlling the inner diameter of the input pipe 95 and the output pipe 96 and the size of the push chamber 97, so that the reciprocating speed of the baffle 43 is more suitable.

[0108] The working principle of this application embodiment is as follows:

[0109] During pre-cleaning, control unit 51 closes air duct 14, and external fan 22 starts. Air pushes brush plate 61 to move through air outlet pipe 52 and upward air supply pipe 71, causing impurities on primary filter 21 to fall off. At the same time, gas in air outlet pipe 52 is sprayed out through cleaning hole 1 64 to clean the fallen impurities, and impurities are sucked in through cleaning hole 2 65. The impurities are moved into collection net 82 for collection. Gas in air outlet pipe 52 is sprayed out through jet hole 1 66 and sucked in through jet hole 2 67, thereby forming an airflow barrier to prevent the cleaned impurities from moving upward, and more impurities are moved into collection net 82 for collection.

[0110] After pre-cleaning is completed, the control unit 51 opens the air duct 14, the internal fan 31 and the external fan 22 start simultaneously, and the air outlet valve 54 closes. Some of the gas inside the air duct 14 can push the brush plate 61 back to its original position through the downward air supply pipe 72, thereby realizing the automatic movement of the brush plate 61 during pre-cleaning and pushing the brush plate 61 back after pre-cleaning is completed. This facilitates the subsequent cleaning of the primary filter 21, thereby improving the cleaning effect of the primary filter 21 and saving energy.

[0111] When cleaning is required, the air outlet 42 opens the air outlet pipe 41 and the sterilization component 44 opens. The gas in the equalizing chamber 34 enters the air outlet pipe 41. After sterilization, the gas is output through the ventilation hole. Some of the gas in the air outlet pipe 41 enters the pushing chamber 97 through the input pipe 95, which pushes multiple pushing plates 98 and the rotating shaft 18 to rotate. The rotation of the rotating shaft 18 drives the baffle 43 to move back and forth, so that the output gas can better cover the work platform 13, improve the cleaning effect, and save energy.

[0112] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dual-circulation clean workbench, characterized in that: It includes the main body (1), working platform (13), air duct (14), external circulation system (2), internal circulation system (3) and air outlet system (4); The external circulation system (2) includes: The pre-filter (21) and the external fan (22) are installed on the air duct (14) so ​​that the outside air is filtered by the pre-filter (21) and then moved to the external fan (22); The internal circulation system (3) includes: An internal fan (31), a main filter (32), and a vortex suppressor (33) are installed on the air duct (14) so ​​that the air passing through the external fan (22) is filtered by the main filter (32) and then passes through the internal fan (31) and the vortex suppressor (33) in sequence. The equalizing box (34) is installed on the body (1) and connected to the air duct (14) so ​​that the air in the air duct (14) is moved to the equalizing box (34) for storage; the air outlet system (4) is connected to the equalizing box (34) and is controlled to open to form a vertical laminar flow covering the working platform (13) or to close the air flow. It also includes a control component (5), which includes: The control unit (51) is installed on the air duct (14) and located between the main filter (32) and the external fan (22) and is used to control the connection or disconnection of the external circulation system (2) and the internal circulation system (3); The air outlet pipe (52) is connected to the air duct (14) located between the external fan (22) and the control unit (51) and is inclined upward and equipped with an air outlet valve (54) for controlling opening and closing. The detection device (53) detects the air flow rate in the exhaust pipe (52) and issues an alarm when the flow rate is less than a specified value. Before startup, the control device (51) controls the external circulation system (2) and the internal circulation system (3) to disconnect. The external fan (22) starts and causes the air to accumulate and be output through the exhaust pipe (52). The detection device (53) measures the air flow rate and issues an alarm when the flow rate is less than a specified value, prompting the pre-filter (21) to be cleaned.

2. The dual-circulation clean workbench according to claim 1, characterized in that: The air outlet system (4) includes: An air outlet duct (41) is installed on the body (1) and connected to the pressure equalization box (34); Air outlet component (42) controls the opening and closing of air outlet pipe (41); A baffle (43) is installed on the air outlet duct (41) and is used to form a vertical laminar flow coverage work platform (13). The sterilization component (44) is located between the air outlet component (42) and the baffle (43). After the air outlet component (42) controls the air outlet pipe (41) to open, the sterilization component (44) starts to sterilize the passing air. The air outlet component (42) controls the air outlet pipe (41) and the sterilization component (44) to close simultaneously.

3. The dual-circulation clean workbench according to claim 1, characterized in that: The air duct (14) is provided with a cleaning mechanism (6) for cleaning the pre-filter (21), the cleaning mechanism (6) including: A brush plate (61) is slidably disposed on the air duct (14) and located on the side of the primary filter (21) near the external fan (22) and is used to clean impurities on the primary filter (21); The moving component (7) is connected to the air outlet pipe (52) and the air duct (14) and drives the brush plate (61) to move for cleaning under the action of air flow. After the control component (51) controls the external circulation system (2) and the internal circulation system (3) to disconnect, the external fan (22) starts to discharge the air in the air duct (14) and drive the brush plate (61) to move. Fixing plate one (62) and fixing plate two (63) are set on the air duct (14). The primary filter (21) is located between fixing plate one (62) and fixing plate two (63). The side wall of fixing plate one (62) near the primary filter (21) is provided with cleaning hole one (64) and air jet hole one (66) spaced apart vertically. Fixing plate two (63) is provided with cleaning hole two (65) and air jet hole two (67) corresponding to cleaning hole one (64) and air jet hole one (66) respectively. Cleaning hole one (64) is located below air jet hole one (66) and is connected to the air outlet pipe (52). The fixed plate 2 (63) has an air intake chamber (68) that communicates with the cleaning hole 2 (65) and the jet hole 2 (67). The bottom of the fixed plate 2 (63) has an air intake channel (69) that communicates with the air duct (14) located above the external fan (22) and the air intake chamber (68). The air intake chamber (68) and the air intake channel (69) work together to generate an adsorption force at the cleaning hole 2 (65) and the jet hole 2 (67). The collection component (8) is detachably mounted on the fixed plate (63) and extends into the suction chamber (68); the cleaning hole (64) sprays out gas and draws in gas, causing the impurities cleaned by the brush plate (61) to move to the collection component (8) for collection; the cleaning hole (65) sprays out gas and draws in gas, forming a gas flow to block the impurities from moving upward.

4. The dual-circulation clean workbench according to claim 3, characterized in that: A movable groove (611) is provided on the inner wall of the air duct (14) and below the primary filter (21). The brush plate (61) is slidably disposed on the movable groove (611) via a movable block (612). The movable assembly (7) includes: An upward air supply pipe (71) is installed on the air outlet pipe (52) located between the air outlet valve (54) and the air duct (14) and is inclined upward; The downward air supply pipe (72) is set on the air duct (14) and connected to the internal circulation system (3) and is set at an angle downward. The upward air supply pipe (71) and the downward air supply pipe (72) are connected to both ends of the moving slot (611) and realize the reciprocating movement of the moving block (612). Two elastic sealing plates (73) are provided on the air duct (14) and located on the upper and lower sides of the moving groove (611). The two elastic sealing plates (73) press against the moving block (612) or press against each other under the action of elastic force and are used to prevent gas from overflowing from the moving groove (611).

5. A dual-circulation clean workbench according to claim 3, characterized in that: The fixing plate 2 (63) has a mounting hole (84) communicating with the air intake chamber (68), and the collecting assembly (8) includes: The collection frame (81) is detachably mounted on the second fixing plate (63) and extends through the mounting hole (84) into the suction chamber (68); A collection net (82) is set on a collection frame (81) to allow air to pass through and collect impurities.

6. The dual-circulation clean bench according to claim 1, characterized in that: The body (1) is located inside and around the air duct (14) to form an installation space for the parts inside the body (1). The primary filter (21) is detachably installed on the air duct (14). A vertical slide (15) is provided on the air duct (14). Two mounting plates (16) are vertically spaced and slidably installed on the slide (15). The external fan (22) and the internal fan (31) are respectively installed on the two mounting plates (16). The mounting plate (16) at the highest point is threaded with a lifting ring (17) for moving the mounting plate (16). Alternatively, the lifting ring (17) is threaded to the two mounting plates (16) and realizes the movement of the two mounting plates (16).

7. A dual-circulation clean workbench according to claim 2, characterized in that: The baffle (43) is provided with a plurality of ventilation holes for air to pass through at intervals. The baffle (43) is reciprocally slidably disposed on the air outlet pipe (41). The body (1) is provided with a drive mechanism (9) for driving the baffle (43) to reciprocate.

8. A dual-circulation clean bench according to claim 7, characterized in that: The drive mechanism (9) includes: The movable disk (91) is rotatably mounted on the body (1) via a rotating shaft (18) and has an eccentrically mounted movable rod (99). The connecting rod (92) is rotatably connected to the moving rod (99) and the baffle (43) respectively; The drive component (93) is connected to the air outlet pipe (41) and drives the moving disk (91) to rotate. When there is air flow in the air outlet pipe (41), the rotating shaft (18) is driven to rotate by the moving component (7).

9. A dual-circulation clean workbench according to claim 8, characterized in that: The driving component (93) includes: A movable cylinder (94) is mounted on the body (1). The rotating shaft (18) extends coaxially into the movable cylinder (94) and is rotatably connected to the movable cylinder (94). Multiple push plates (98) are arranged in a circular array around the axis of the rotating shaft (18). Two adjacent push plates (98) cooperate with the inner sidewall of the movable cylinder (94) to form a push cavity (97). The input pipe (95) and output pipe (96) are set on the moving cylinder (94) and connected to the two push chambers (97) and the air outlet pipe (41), so that the air in the air outlet pipe (41) enters the push chamber (97) and drives the push plate (98) to rotate and then flows back into the air outlet pipe (41).

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