Laboratory exhaust fume purification fume hood
Patent Information
- Application Number
- CN202611233709.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-14
- Publication Date
- 2026-09-25
AI Technical Summary
然而，由于不同实验过程中废气产生位置、扩散范围以及污染物浓度存在差异，固定位置的抽气结构难以根据实际实验需求调整抽气区域，容易出现远离抽气口位置废气收集效率降低的问题
1.通过设置调节机构，使实验人员能够通过拉动拉杆带动转动盘沿导轨转动，并利用转动盘、支撑杆、衔接杆以及连杆之间的联动关系，使衔接筒沿径向方向展开或收拢，从而实现多个抽气位置的同步调节，使通风柜能够根据实验区域大小改变废气抽取范围，提高废气收集的覆盖能力。
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Figure CN122806810A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of waste gas purification technology, and in particular to a laboratory waste gas purification fume hood. Background Technology
[0002] During chemical analysis, biological experiments, and materials testing, laboratories typically generate waste gases such as volatile organic compounds, acidic and alkaline gases, and particulate matter. To prevent laboratory personnel from being exposed to harmful gas environments for extended periods, existing laboratories usually use fume hoods to extract the waste gases generated during experiments and purify them through filtration, adsorption, and other methods.
[0003] Existing laboratory fume hoods typically employ a fixed extraction structure, meaning a fixed extraction port is installed at the top or rear of the fume hood, continuously drawing exhaust gases from the experimental area into the purification device. However, due to variations in the location, diffusion range, and pollutant concentration of exhaust gases during different experiments, fixed extraction structures struggle to adjust the extraction area according to actual experimental needs, often resulting in reduced collection efficiency for gases located far from the extraction port. Furthermore, existing extraction devices often lack angle adjustment capabilities at the intake port, preventing it from quickly approaching the exhaust gas source when the height of experimental equipment or the experimental operation position changes, leading to insufficient localized exhaust gas capture.
[0004] In addition, some ventilation equipment with adjustment functions requires the configuration of motors, controllers and other drive mechanisms, which not only have complex structures and high manufacturing costs, but are also prone to control failures or maintenance difficulties during long-term operation. Summary of the Invention
[0005] Therefore, it is necessary to provide a laboratory exhaust gas purification fume hood to address the aforementioned technical problems.
[0006] The laboratory exhaust gas purification fume hood provided in this application adopts the following technical solution: it includes a purification box, which is used to purify the exhaust gas generated during the experiment. An exhaust fan is installed at the upper end of the purification box, and a control board for controlling the start and stop of the exhaust fan is provided at the lower end of the front face of the purification box. The bottom of the purification box is vertically fixed with brackets at both ends. Side plates are embedded in the upper inner sides of the two sets of brackets. A workbench is set below the purification box. The two sides of the workbench are connected to the middle inner side of the corresponding bracket. An adjustment mechanism is installed at the lower end of the interior of the purification box. An adjustable air extraction mechanism is connected to the bottom of the adjustment mechanism. The top of the adjustable air extraction mechanism is connected to the adjustment mechanism and is connected to the purification box assembly installed at the upper end of the interior of the purification box through an air duct. The air duct is connected to the middle of the bottom of the purification box assembly. The four ends of the bottom of the purification box assembly are respectively equipped with conduits. The conduits are used to connect to the corresponding positions on the top of the adjustment mechanism. Four sets of connecting rods are installed on the outer side of the bottom of the purification box assembly. The bottom of the connecting rods are connected to the adjustment mechanism. The bottom of the purification box is fixed with connecting cylinders at four ends. A filter screen for the entry of exhaust gas is installed at the lower end of the connecting cylinder. The top of the connecting cylinder is connected to the duct. A circular hole is opened at the bottom of the purification box. A circular guide rail is provided inside the circular hole. The adjustment mechanism is installed in the guide rail and can rotate along the guide rail. A pull rod is connected to the bottom of the adjustment mechanism near the guide rail. The pull rod is used to drive the adjustment mechanism to move so as to adjust the air extraction range.
[0007] Preferably, the adjustment mechanism includes a fixed frame, the fixed frame having an overall cross-shaped structure and a circular opening in the middle of the fixed frame, the four ends of the fixed frame being fixedly connected to the connecting rod, the bottom of the fixed frame abutting against a support cylinder, the bottom of the support cylinder being fixedly connected to a rotating disk, the rotating disk being disposed in the guide rail and being able to rotate relative to the fixed frame.
[0008] Preferably, the rotating disk has five sets of through slots spaced circumferentially inside, and the bottom of the fixed frame is hinged with connecting rods at four ends. The connecting rods are arranged in an arc shape, and a connecting cylinder is fixedly connected to the end of the connecting rod away from the fixed frame. A connecting sleeve is fixedly connected to the top of the connecting cylinder, and the connecting sleeve is used to connect with the conduit.
[0009] Preferably, a connecting rod is hinged to the bottom of the connecting rod near the position where it is connected to the fixed frame, and the end of the connecting rod away from the connecting rod is hinged to the support rod; the support rod is vertically fixed between adjacent through slots, the bottom of the connecting cylinder matches the connecting cylinder, and the connecting cylinder can move to below the connecting cylinder under the drive of the connecting rod and communicate with the connecting cylinder to form an air extraction passage.
[0010] Preferably, the pull rod is connected to the rotating disk. When the pull rod moves, it drives the rotating disk to rotate along the guide rail. During the rotation of the rotating disk, the connecting cylinder can be synchronously expanded outward or retracted inward through the linkage between the support rod, the connecting rod and the connecting rod to adjust the exhaust gas extraction range.
[0011] Preferably, the adjustable air extraction mechanism includes an upper guide member, a connecting plate is fixedly welded to the top of the upper guide member, the connecting plate is fixedly installed on the upper inner side of the fixing frame, and the upper guide member is connected to the air duct through the connecting plate.
[0012] Preferably, the bottom of the upper guide is configured as an inclined surface structure, the lower guide is disposed below the upper guide, and the top of the lower guide is fitted to the bottom of the upper guide. A bolt is provided through the middle of the upper guide and the lower guide, and the two ends of the bolt are respectively locked and fixed by nuts to keep the upper guide and the lower guide connected.
[0013] Preferably, the lower guide member can swing relative to the upper guide member at an angle after the bolt is released from its locked state, and after adjustment, it can be re-locked by the bolt to maintain the adjusted angle of the lower guide member.
[0014] Preferably, a flexible corrugated tube is connected to the bottom of the lower guide, and an inhalation hood is connected to the bottom of the corrugated tube. The corrugated tube can bend with the angle of the lower guide to drive the inhalation hood to perform multi-angle position adjustments.
[0015] Preferably, the exhaust fan is connected to the purification box assembly, which is used to purify the waste gas entering it. The waste gas can be treated through the airflow channel formed by the suction hood, corrugated pipe, lower guide, upper guide, air duct and purification box assembly, or it can enter the purification box assembly for treatment through the connecting cylinder, connecting tube and duct.
[0016] In summary, this application includes the following beneficial technical effects: 1. By setting up an adjustment mechanism, the experimenter can pull the lever to drive the rotating disk to rotate along the guide rail. By utilizing the linkage between the rotating disk, support rod, connecting rod and connecting rod, the connecting cylinder can be expanded or retracted in the radial direction, thereby realizing the synchronous adjustment of multiple air extraction positions. This allows the fume hood to change the exhaust gas extraction range according to the size of the experimental area, improving the coverage of exhaust gas collection.
[0017] 2. By setting an adjustable suction mechanism and utilizing the inclined fit structure between the upper and lower guide components, the lower guide component can be angled relative to the upper guide component. Combined with the bending deformation of the flexible corrugated pipe, the suction hood can be adjusted in multiple directions, bringing the suction inlet closer to the exhaust gas generation location and improving the local exhaust gas capture efficiency.
[0018] 3. Utilizing a mechanical adjustment structure, the fume hood eliminates the need for complex additional drive equipment. The extraction range can be adjusted simply by manually operating a lever, resulting in a simple, highly reliable, and easy-to-maintain design. Furthermore, the combination of extraction range adjustment and inlet angle adjustment enhances the fume hood's adaptability to different experimental environments and varying exhaust gas generation locations. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of the internal structure of the cleanroom enclosure in this application; Figure 3 This is a schematic diagram of the bottom structure inside the cleanroom box of this application; Figure 4 This is a schematic diagram of the connection structure of the adjustment mechanism in this application; Figure 5 This is a schematic diagram of the overall structure of the regulating mechanism in this application; Figure 6 A schematic diagram of the overall structure of the regulating mechanism in this application is provided; Figure 7 This is a schematic diagram of the linkage connection structure of this application; Figure 8 This is a schematic diagram of the overall structure of the adjustable air extraction mechanism in this application; Figure 9 This is a schematic diagram of the overall swing structure of the lower guide member in this application; Figure 10 This is a cross-sectional structural diagram of the upper guide and lower guide of this application.
[0020] Explanation of reference numerals in the attached drawings: Purification box-1, Exhaust fan-2, Control panel-3, Bracket-4, Side plate-5, Workbench-6, Adjustment mechanism-7, Adjustable exhaust mechanism-8, Purification box assembly-9, Air duct-10, Connecting rod-11, Connecting cylinder-12, Guide rail-13, Pull rod-14, Duct-15, Fixing frame-71, Support cylinder-72, Rotating disc-73, Connecting rod-74, Connecting cylinder-75, Connecting sleeve-76, Connecting rod-77, Support rod-78, Upper guide-81, Connecting disc-82, Bolt-83, Lower guide-84, Corrugated pipe-85, Suction hood-86. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0022] A laboratory exhaust gas purification fume hood, referring to Figures 1-4 The purification box 1 is used to purify the exhaust gas. An exhaust fan 2 is installed at the upper end of the purification box 1. A control board 3 is set at the lower end of the front face of the purification box 1. A bracket 4 is vertically fixed at both ends of the bottom of the purification box 1. Side plates 5 are embedded in the upper left and right positions of the inner side of the bracket 4. A workbench 6 is below the purification box 1. The two sides of the workbench 6 are connected to the middle of the inner side of the bracket 4. An adjustment mechanism 7 is installed at the lower end of the purification box 1. The bottom of the adjustment mechanism 7 is connected to an adjustable exhaust mechanism 8. The top of the adjustable exhaust mechanism 8 is connected to the air duct 10 through the adjustment mechanism 7. A purification box assembly 9 connected to the exhaust fan 2 is installed at the upper end of the purification box 1. The air duct 10 is connected to the middle of the bottom of the purification box assembly 9. A set of ducts 15 is installed at each of the four ends of the bottom of the purification box assembly 9. The ducts 15 are used to connect to the four ends of the top of the adjustment mechanism 7. Four sets of connecting rods 11 are installed at the outer end of the bottom of the purification box assembly 9. The bottom of the connecting rods 11 is used to connect to the support adjustment. Mechanism 7: Connecting cylinders 12 are fixed at four ends at the bottom of the purification box 1. A filter screen is installed at the lower end of the connecting cylinder 12 for air extraction. The top of the connecting cylinder 12 is connected to the conduit 15. A round hole is opened at the bottom of the purification box 1. A guide rail 13 is connected to the inside of the round hole. The guide rail 13 is circular. An adjustment mechanism 7 is connected inside the guide rail 13. A pull rod 14 is connected to the bottom right end of the adjustment mechanism 7 near the guide rail 13. The pull rod 14 can realize the transmission of the adjustment mechanism 7. The adjustment mechanism 7 can increase the air extraction range. The adjustable air extraction mechanism 8 realizes the adjustment of the main air extraction position.
[0023] Reference Figures 5-7 The adjusting mechanism 7 includes a cross-shaped fixing frame 71 with a circular opening in the middle. The four ends of the fixing frame 71 are locked to the connecting rod 11. The bottom of the fixing frame 71 contacts the support cylinder 72, and the bottom of the support cylinder 72 is fixed to the rotating disk 73. The rotating disk 73 has through slots at its five ends. A set of connecting rods 74 are hinged to each of the four ends of the bottom of the fixing frame 71. The connecting rods 74 are arc-shaped, and a connecting cylinder 75 is fixed to the other end of the connecting rod 74. A connecting sleeve for connecting to the conduit 15 is fixed to the top of the connecting cylinder 75. 76. A connecting rod 77 is hinged to the bottom of the connecting rod 74 near the connection position with the fixed frame 71. The other end of the connecting rod 77 is hinged to the support rod 78. The support rod 78 is vertically fixed between each set of through slots. The bottom of the connecting cylinder 75 matches the connecting cylinder 12. After connection, air extraction can be achieved. When the connecting cylinder 75 is not moved, its lower part is placed above the through slot. The top of the adjustable air extraction mechanism 8 passes through the rotating disk 73 and the support cylinder 72 and is connected to the upper inner side of the fixed frame 71. The upper inner side of the fixed frame 71 is connected to the air duct 10.
[0024] Reference Figures 8-10 The adjustable suction mechanism 8 includes an upper guide 81, with a connecting plate 82 welded to and connected to the top of the upper guide 81. The connecting plate 82 is fixed inside the upper end of the fixing frame 71. The bottom of the upper guide 81 is inclined and the bottom of the upper guide 81 is in contact with the lower guide 84. The contact surfaces of the two are matched. The upper guide 81 and the lower guide 84 are connected in the middle by bolts 83. The bolts 83 are secured on both sides by nuts. The bottom of the lower guide 84 is connected to a flexible corrugated pipe 85, and the bottom of the corrugated pipe 85 is connected to a suction hood 86.
[0025] In this embodiment, when conducting experiments, the experimenter places the area of exhaust gas generated during the experiment above the workbench 6. First, the exhaust fan 2 is started via the control board 3 to create a negative pressure environment inside the purification chamber 1. While the exhaust fan 2 is running continuously, the exhaust gas generated in the experimental area enters the exhaust channel under negative pressure and is treated by the filtration and purification structure inside the purification chamber assembly 9 before being discharged by the exhaust fan 2, thus achieving purification of laboratory exhaust gas.
[0026] In the initial state of the equipment, the adjustment mechanism 7 is in the retracted state, and the fixing frame 71 is fixedly installed below the purification box assembly 9 via the connecting rod 11. The middle part of the fixing frame 71 is connected to the air duct 10. A support cylinder 72 is installed at the bottom of the fixing frame 71, and the lower end of the support cylinder 72 is fixedly connected to the rotating disk 73. The rotating disk 73 can rotate along the guide rail 13 set in the circular hole at the bottom of the purification box 1. The rotating disk 73 has multiple through slots inside. The four ends of the bottom of the fixing frame 71 are respectively hinged to the connecting rod 74, and the other end of the connecting rod 74 is connected to the connecting cylinder 75. The top of the connecting cylinder 75 is connected to the duct 15 via the connecting sleeve 76, and the bottom corresponds to the connecting cylinder 12. In the unadjusted state, the connecting cylinder 75 is located above the through slots of the rotating disk 73 and is not connected to the connecting cylinder 12. It is only through the adjustable air extraction mechanism 8 in the middle that the air is centrally extracted.
[0027] When the diffusion range of the exhaust gas increases during the experiment, requiring an expansion of the extraction coverage area, the experimenter manually pulls the lever 14 located at the bottom right end of the adjustment mechanism 7. Since the lever 14 is connected to the rotating disk 73, its movement causes the rotating disk 73 to rotate along the guide rail 13. As the rotating disk 73 rotates, the position of the through groove inside it changes, causing the support rod 78, fixed to the frame 71, to move relative to it. This movement, via the connecting rod 77, pushes the connecting rod 74 to swing. Because one end of the connecting rod 74 is hinged to the frame 71 and the other end is connected to the connecting cylinder 75, the connecting rod 74, during its swing, causes the connecting cylinder 75 to move radially outward, gradually moving it away from the center of the frame 71 and down to the corresponding connecting cylinder 12. When the rotating disk 73 reaches the set position, the four sets of connecting cylinders 75 correspond to and fit into the connecting cylinders 12 located at the four ends of the bottom of the purification box 1, opening the extraction channel inside the connecting cylinder 12.
[0028] At this time, under the negative pressure generated by the exhaust fan 2, the exhaust gas generated outside the experimental area can enter through the filter screen at the bottom of the connecting cylinder 12, and then pass through the connecting cylinder 75 and the duct 15 in sequence into the purification box assembly 9, realizing multi-point exhaust from the outside. By manually adjusting the moving distance of the pull rod 14, the rotation angle of the rotating disk 73 can be controlled, thereby changing the unfolding position of the connecting cylinder 75, so that the exhaust gas extraction range can be adjusted according to the actual experimental area size.
[0029] During the experiment, when it is necessary to focus on extracting the exhaust gas at the center of the experiment, the suction direction can be adjusted by adjusting the adjustable suction mechanism 8. Specifically, the experimenter loosens the nuts on both sides of the bolt 83, releasing the locking between the upper guide 81 and the lower guide 84. Because the bottom of the upper guide 81 and the top of the lower guide 84 adopt an inclined matching structure, the lower guide 84 can deflect at an angle relative to the upper guide 81. After adjusting to the target direction, the bolt 83 and the nuts on both sides are tightened again to keep the upper guide 81 and the lower guide 84 fixedly connected, thereby changing the downward suction direction.
[0030] Meanwhile, since the bottom of the lower guide 84 is connected to the flexible bellows 85, the bellows 85 can bend with the angle of the lower guide 84, allowing the suction hood 86 installed at the bottom of the bellows 85 to be further adjusted in spatial position. Researchers can adjust the height, tilt direction, and proximity to the pollution source of the suction hood 86 according to the location of the exhaust gas generation, so that the suction hood 86 can be closer to the exhaust gas generation point, improving the local exhaust gas capture effect.
[0031] When the experiment ends or when there is no need to expand the evacuation range, the experimenter pushes the pull rod 14 in the opposite direction, causing the rotating disk 73 to rotate in the opposite direction along the guide rail 13. During the rotation of the rotating disk 73, a reverse transmission is formed through the support rod 78, the connecting rod 77, and the connecting rod 74, causing the connecting cylinder 75 to gradually retract towards the center of the fixed frame 71 and detach from the connecting cylinder 12, thereby closing the peripheral evacuation path and restoring the adjustment mechanism 7 to the initial centralized evacuation state.
[0032] Through the above implementation method, the exhaust gas purification fume hood in this embodiment achieves the change of the air extraction range through a mechanical pull rod adjustment structure, without the need to add a complex electronic control actuator. It only uses the pull rod 14 to drive the rotating disk 73 to rotate, and realizes the synchronous expansion or contraction of multiple connecting cylinders 75 through linkage transmission. At the same time, combined with the angle adjustment of the adjustable air extraction mechanism 8 and the flexible deformation of the bellows 85, the suction hood 86 has multi-directional adjustment capability, thereby improving the fume hood's adaptability to different experimental scenarios and different exhaust gas generation locations, and achieving more flexible and efficient exhaust gas capture.
Claims
1. A laboratory exhaust gas purification fume hood, characterized in that: The device includes a purification chamber for purifying the waste gas generated during the experiment. An exhaust fan is installed at the upper end of the purification chamber, and a control board for controlling the start and stop of the exhaust fan is provided at the lower end of the front face of the purification chamber. The bottom of the purification box is vertically fixed with brackets at both ends. Side plates are embedded in the upper inner sides of the two sets of brackets. A workbench is set below the purification box. The two sides of the workbench are connected to the middle inner side of the corresponding bracket. An adjustment mechanism is installed at the lower end of the interior of the purification box. An adjustable air extraction mechanism is connected to the bottom of the adjustment mechanism. The top of the adjustable air extraction mechanism is connected to the adjustment mechanism and is connected to the purification box assembly installed at the upper end of the interior of the purification box through an air duct. The air duct is connected to the middle of the bottom of the purification box assembly. The four ends of the bottom of the purification box assembly are respectively equipped with conduits. The conduits are used to connect to the corresponding positions on the top of the adjustment mechanism. Four sets of connecting rods are installed on the outer side of the bottom of the purification box assembly. The bottom of the connecting rods are connected to the adjustment mechanism. The bottom of the purification box is fixed with connecting cylinders at four ends. A filter screen for the entry of exhaust gas is installed at the lower end of the connecting cylinder. The top of the connecting cylinder is connected to the duct. A circular hole is opened at the bottom of the purification box. A circular guide rail is provided inside the circular hole. The adjustment mechanism is installed in the guide rail and can rotate along the guide rail. A pull rod is connected to the bottom of the adjustment mechanism near the guide rail. The pull rod is used to drive the adjustment mechanism to move so as to adjust the air extraction range.
2. The laboratory exhaust gas purification fume hood according to claim 1, characterized in that: The adjustment mechanism includes a fixed frame, which is generally cross-shaped and has a circular opening in the middle. The four ends of the fixed frame are fixedly connected to the connecting rod. The bottom of the fixed frame abuts against a support cylinder, and a rotating disk is fixedly connected to the bottom of the support cylinder. The rotating disk is disposed in the guide rail and can rotate relative to the fixed frame.
3. The laboratory exhaust gas purification fume hood according to claim 2, characterized in that: The rotating disk has five sets of through slots spaced circumferentially inside. The bottom of the fixed frame is hinged with connecting rods at four ends. The connecting rods are arranged in an arc shape. A connecting cylinder is fixedly connected to the end of the connecting rod away from the fixed frame. A connecting sleeve is fixedly connected to the top of the connecting cylinder. The connecting sleeve is used to connect with the conduit.
4. The laboratory exhaust gas purification fume hood according to claim 3, characterized in that: A connecting rod is hinged to the bottom of the connecting rod near the position where it is connected to the fixed frame. The end of the connecting rod away from the connecting rod is hinged to the support rod. The support rod is vertically fixed between adjacent through slots. The bottom of the connecting cylinder matches the connecting cylinder. The connecting cylinder can move to below the connecting cylinder under the drive of the connecting rod and communicate with the connecting cylinder to form an air extraction passage.
5. The laboratory exhaust gas purification fume hood according to claim 4, characterized in that: The pull rod is connected to the rotating disk. When the pull rod moves, it drives the rotating disk to rotate along the guide rail. During the rotation of the rotating disk, the connecting cylinder expands outward or retracts inward synchronously through the linkage between the support rod, the connecting rod and the connecting rod, so as to adjust the exhaust gas extraction range.
6. The laboratory exhaust gas purification fume hood according to claim 2, characterized in that: The adjustable air extraction mechanism includes an upper guide member, and a connecting plate is fixedly welded to the top of the upper guide member. The connecting plate is fixedly installed on the upper inner side of the fixing frame, and the upper guide member is connected to the air duct through the connecting plate.
7. The laboratory exhaust gas purification fume hood according to claim 6, characterized in that: The bottom of the upper guide is designed with an inclined surface structure, and the lower guide is located below the upper guide. The top of the lower guide is fitted to the bottom of the upper guide. A bolt is inserted through the middle of the upper guide and the lower guide. Both ends of the bolt are locked and fixed by nuts to keep the upper guide and the lower guide connected.
8. The laboratory exhaust gas purification fume hood according to claim 7, characterized in that: The lower guide member can swing relative to the upper guide member at an angle after the bolt is released from its locked state. After adjustment, the bolt is tightened again to keep the lower guide member at the adjusted angle.
9. The laboratory exhaust gas purification fume hood according to claim 7, characterized in that: The bottom of the lower guide is connected to a flexible corrugated tube, and the bottom of the corrugated tube is connected to an inhalation hood. The corrugated tube can bend with the angle of the lower guide to drive the inhalation hood to adjust its position at multiple angles.
10. The laboratory exhaust gas purification fume hood according to claim 1, characterized in that: The exhaust fan is connected to the purification box assembly, which is used to purify the waste gas entering it.