Ventilation cabinet with waste liquid collection function

Abstract

The utility model relates to the technical field of fume cupboards, in particular to a fume cupboard with a waste liquid collection function, which aims at solving the technical problem of overcoming the defect of waste liquid collection in the prior art and is mainly realized through the following technical scheme that the fume cupboard with the waste liquid collection function comprises a cupboard body and a cupboard frame, the cabinet body is arranged above the cabinet frame, the top of the cabinet body is provided with an air draft part and an air supplement part, an operation cavity is formed in the cabinet body, collection openings with waste liquid covers are formed in the two ends in the operation cavity, the lower portions of the collection openings are connected with a liquid outlet pipe on the liquid collection tank through liquid outlet pipes, the liquid collection tank is installed on the rear side in the cabinet frame, and the liquid inlet pipe and the liquid outlet pipe are connected through a fastening part and a locking part. A flow guide part is further arranged in the operation cavity and comprises two flow guide plates and an air guide plate, gas collection openings are further formed in the positions, corresponding to the collection openings, of the flow guide plates, waste liquid is directly fed into the waste liquid tank through the collection openings to be collected, overturning caused by waste liquid stacking is avoided, and the gas collection openings are specially formed above the collection openings to prevent waste liquid secondary volatilization from affecting experiment safety.

Description

Technical Field

[0001] This utility model relates to the field of fume hood technology, specifically to a fume hood with waste liquid collection. Background Technology

[0002] Fume hoods are an indispensable part of laboratory ventilation design. In order to prevent laboratory staff from inhaling or swallowing some toxic, pathogenic or unidentified toxic chemicals and organisms, laboratories should have good ventilation. To prevent the absorption of some vapors, gases and particles, pollutants must be removed by fume hoods, ventilation covers or local ventilation methods.

[0003] Existing fume hoods generate waste liquid during operation, but lack a waste liquid collection device inside the fume hood. As a result, the waste liquid tends to accumulate on the work surface, which can easily lead to accidental spillage and affect experimental safety. Some laboratory personnel may discharge the waste liquid directly into the sewer without treatment, causing environmental pollution. In some fume hoods that do have waste liquid collection, the odor in the waste liquid can easily undergo secondary volatilization inside the fume hood, creating experimental hazards. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the defects of waste liquid collection in the prior art, thereby providing a fume hood with waste liquid collection.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A fume hood with waste liquid collection includes a cabinet body and a cabinet frame. The cabinet body is located above the cabinet frame and has an operating cavity. An operating window is vertically slidable on the front side of the operating cavity. Two collection ports with waste liquid covers are opened on the rear bottom side of the operating cavity. The collection ports are positioned opposite each other at both ends of the operating cavity. A liquid outlet pipe is connected below the collection ports, and the other end of the liquid outlet pipe is connected to a liquid collection tank. The liquid collection tank is installed on the rear side of the cabinet frame. A compartment is also provided on the front side of the cabinet frame.

[0007] By adopting the above technical solution, a collection port is directly set inside the fume hood, and the waste liquid is directly sent into the waste liquid tank through the collection port for collection, avoiding the risk of spillage caused by the accumulation of waste liquid. A special gas collection port is set above the collection port to prevent secondary volatilization of waste liquid from affecting experimental safety.

[0008] Furthermore, the collection port includes an integrally formed collection chamber and a liquid passage chamber. The collection chamber is a hollow cylinder, and the liquid passage chamber is located below the collection chamber and is a frustum-shaped structure with its diameter decreasing from top to bottom. An L-shaped liquid outlet pipe is connected to the bottom of the liquid passage chamber. The top end of the liquid outlet pipe is connected to the bottom of the liquid passage chamber, and the other end is connected to the side wall of the collection tank. The waste liquid cover is hinged to the bottom of the operating chamber. The bottom of the operating chamber is also provided with a receiving opening corresponding to the waste liquid cover, and a handle is provided on the waste liquid cover.

[0009] By adopting the above technical solution, the waste liquid flows through the collection chamber and the liquid passage chamber, then through the liquid outlet pipe and finally into the collection tank, which facilitates the discharge and recycling of waste liquid; the waste liquid cap needs to be opened by pulling the handle before use.

[0010] Furthermore, the waste liquid cap is also vertically slidably disposed on the rear side of the collection port. A sliding groove is provided in the operating chamber corresponding to the waste liquid cap. A shielding cover is also slidably disposed on the collection port. The shielding cover is slidably disposed along the width direction of the operating chamber. The shielding cover and the waste liquid cap are connected by a connector. The connector is disposed at both ends of the collection port. Each end of the connector includes a driving rack, a transmission gear and a driven rack. The driving rack is disposed along the length direction of the waste liquid cap and is disposed on the side close to the collection port. The transmission gear is rotatably mounted in the operating chamber and its axis is disposed along the length direction of the operating chamber. The driven rack is fixed to the top of the shielding cover and is disposed along the length direction of the shielding cover.

[0011] By adopting the above technical solution, after the waste liquid cover is pulled open, it slides to the bottom along the sliding groove. Under the linkage of the connecting parts, the cover opens to expose the collection port, which facilitates the collection of waste liquid during the experiment.

[0012] Furthermore, an inlet pipe extends from the side wall of the collection tank corresponding to the outlet pipe. The diameter of the inlet pipe on the side closer to the collection tank is larger than the diameter on the side farther from the collection tank. The inlet pipe and the outlet pipe are connected by a fastening device. The fastening device includes a first clip and a second clip. The first clip is sleeved on the inlet pipe, and the second clip is fixed to the end of the outlet pipe near the inlet pipe. The first clip has a tightening thread extending from it, and the second clip has a fastening groove corresponding to the first clip. A tightening thread is also provided in the fastening groove.

[0013] By adopting the above technical solution, the first clip is sleeved on the liquid outlet pipe. As the liquid collection tank is sent into the storage tank, the first clip and the second clip are aligned and fastened. Then, the first clip and the second clip are rotated to connect the threads, thus completing the connection between the liquid inlet pipe and the liquid outlet pipe.

[0014] Furthermore, a locking component is provided between the liquid outlet pipe and the liquid collection tank. The locking component is installed on the fastening component. The locking component includes a locking ring groove and a locking ring catch. The locking ring groove is located at the top of the first catch, and the locking ring catch is semi-circular and rotates along the axis of the second catch.

[0015] By adopting the above technical solution, after the inlet pipe and outlet pipe are connected, the fastening point is locked by the locking device. When the locking device is not locked or when it is necessary to disassemble the outlet pipe and the collection tank, the semi-circular locking ring located below the outlet pipe can support the connection between the outlet pipe and the inlet pipe, preventing waste liquid from leaking directly into the fume hood.

[0016] Furthermore, the cabinet frame is also provided with a storage tank corresponding to the liquid collection tank. The storage tank has an inlet and outlet on the rear side, and the inlet and outlet are hinged with doors. Two opposite guide rails are provided at the bottom of the storage tank.

[0017] By adopting the above technical solution, the storage tank is easy to place collection tanks and collection ports, the door and inlet are coordinated to facilitate the maintenance of the waste liquid collection structure, and the guide rail facilitates the delivery of the storage tank and ensures the alignment of the subsequent outlet pipe and inlet pipe.

[0018] Furthermore, the top of the cabinet is equipped with an exhaust fan and an air supply fan, both of which are connected to the operating cavity. The operating cavity is also equipped with a guide fan, which includes two vertically arranged guide plates and a guide plate. The guide plates are arranged parallel to the rear side wall of the operating cavity and have a gap between them. The guide plate is inclinedly arranged at the top of the operating cavity, with one end connected to the center of the top of the operating cavity and the other end connected to the top of the upper guide plate.

[0019] By adopting the above technical solution, a balanced air pressure environment is formed in the operating chamber by the exhaust and replenishment air components. During the experiment, replenishment air is supplied from the top, while harmful substances generated during the experiment are discharged out of the operating chamber by the exhaust components. The replenishment and exhaust operations do not interfere with each other, and the airflow is made smoother and gentler by the design of the guide components, which can run smoothly and avoid airflow collision and reduce the generation of turbulence. It also avoids the overflow of harmful gases, making the wind speed in the operating chamber more uniform and ensuring the safety of the experimenter.

[0020] Furthermore, the guide plate is fixed in the operating chamber by fixing bolts. Multiple guide holes are opened on the guide plate. The lower guide plate is also provided with an air collection port corresponding to the collection port. A filter screen is fixed on the air collection port.

[0021] By adopting the above technical solution, the guide hole can reduce the average surface wind speed required for containment, reduce the resistance of airflow entering the fixed guide plate, enhance the containment capability of the fixed guide plate while reducing turbulence and the overflow of toxic and harmful gases. The guide plate is equipped with a gas collection port at the corresponding collection port, which can specifically absorb and extract gas when the collection port is opened, reducing the impact of secondary volatilization of waste liquid.

[0022] In summary, the technical solution of this utility model has the following advantages:

[0023] 1. The fume hood with waste liquid collection provided by this utility model has a collection port directly set inside the fume hood, and the waste liquid is directly sent into the waste liquid tank through the collection port for collection, avoiding the risk of overturning due to waste liquid accumulation.

[0024] 2. The fume hood with waste liquid collection provided by this utility model has a waste liquid cover that is linked to a shielding cover through a connector, providing double protection at the collection port to prevent waste liquid leakage when the collection port is not in use; when the waste liquid cover is pulled open, the shielding cover opens to expose the collection port, facilitating waste liquid collection during the experiment.

[0025] 3. The fume hood with waste liquid collection provided by this utility model has a special gas collection port above the collection port to prevent secondary volatilization of waste liquid from affecting experimental safety. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of a fume hood with waste liquid collection provided in one embodiment of the present invention;

[0028] Figure 2 This is a structural diagram of the cabinet and inlet / outlet provided in one embodiment of the present utility model;

[0029] Figure 3 This is a structural schematic diagram of the cabinet and the flow guide provided in one embodiment of the present utility model;

[0030] Figure 4 This is a cross-sectional view of the collection port provided in one embodiment of the present invention.

[0031] Figure 5 This is a partial structural diagram of the collection port and waste liquid cover provided in one embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Cabinet body; 11. Operating chamber; 111. Receiving opening; 112. Sliding track; 12. Operating window; 13. Exhaust fan; 14. Make-up air fan; 2. Cabinet frame; 21. Compartment cabinet; 22. Storage tank; 221. Inlet / outlet; 2211. Door / entry door; 222. Guide rail; 23. Collection port; 231. Collection chamber; 232. Liquid passage chamber; 233. Cover; 24. Waste liquid cover; 241. Handle; 25. Outlet 26. Liquid pipe; 26. Liquid collection tank; 261. Liquid inlet pipe; 3. Connecting parts; 31. Driving rack; 32. Transmission gear; 33. Driven rack; 4. Fastening parts; 41. First fastener; 42. Second fastener; 421. Fastening groove; 5. Locking parts; 51. Locking ring groove; 52. Locking ring clip; 6. Flow guide parts; 61. Flow guide plate; 611. Flow guide hole; 612. Air collection port; 613. Filter screen; 62. Air guide plate. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0035] A fume hood with waste liquid collection, such as Figure 1 and Figure 2 As shown, it includes a cabinet body 1 and a cabinet frame 2. The cabinet body 1 is located above the cabinet frame 2. An operating cavity 11 is provided on the cabinet body 1. An operating window 12 is vertically slidable on the front side of the operating cavity 11. A compartment cabinet 21 is also provided on the front side of the cabinet frame 2.

[0036] Two collection ports 23 with waste liquid caps 24 are provided on the rear bottom side of the operating chamber 11. The collection ports 23 are positioned opposite each other at both ends of the operating chamber 11. Each collection port 23 is connected to a liquid outlet pipe 25, and the other end of the liquid outlet pipe 25 is connected to a liquid collection tank 26, which is installed on the rear side of the cabinet frame 2. The cabinet frame 2 also has a storage tank trough 22 corresponding to the liquid collection tank 26. The storage tank trough 22 has an inlet and outlet 221 on its rear side, and an inlet and outlet door 2211 is hinged to the inlet and outlet 221. Two opposite guide rails 222 are provided at the bottom of the storage tank trough 22. The storage tank trough 22 facilitates the placement of the liquid collection tank 26 and collection ports 23. The inlet and outlet door 2211 cooperates with the inlet and outlet 221 to facilitate the maintenance of the waste liquid collection structure. The guide rails 222 facilitate the insertion of the storage tank and ensure the alignment of the subsequent liquid outlet pipe 25 with the liquid inlet pipe 261.

[0037] like Figure 1 and Figure 3As shown, the top of the cabinet 1 is provided with an exhaust fan 13 and an air supply fan 14. Both the exhaust fan 13 and the air supply fan 14 are connected to the operating chamber 11. The operating chamber 11 is also provided with a guide fan 6. The guide fan 6 includes two vertically arranged guide plates 61 and a guide plate 62. The guide plates 61 are arranged parallel to the rear side wall of the operating chamber 11 and a gap is left between them. The upper guide plate 61 can be slightly tilted and a gap is left between it and the lower guide plate 61. The guide plate 62 is tilted and set at the top of the operating chamber 11. One end of the guide plate 62 is connected to the center of the top of the operating chamber 11, and the other end is movably connected to the top of the upper guide plate 61. The operating chamber 11 forms a balanced air pressure environment with the exhaust fan 13 and the air supply fan 14. During the experiment, the air supply is provided from the top, while the harmful substances generated during the experiment are led out of the operating chamber 11 by the exhaust fan 13. The air supply and exhaust operations do not interfere with each other, and the airflow is made smoother and gentler by the design of the guide fan 6. It can run smoothly and avoid airflow collision and reduce the generation of turbulence, and also avoid the overflow of harmful gases, so that the wind speed in the operating chamber 11 is more uniform, ensuring the safety of the experimenter.

[0038] The guide plate 61 is fixed in the operating chamber 11 by fixing bolts. Multiple guide holes 611 are provided on the guide plate 61. A gas collecting port 612 is also provided on the lower guide plate 61 corresponding to the collection port 23, and a filter screen 613 is fixed on the gas collecting port 612. The guide holes 611 can reduce the average surface wind speed required for containment, reduce the resistance of airflow entering the fixed guide plate 61, enhance the containment capacity of the fixed guide plate 61 while reducing turbulence and the leakage of toxic and harmful gases. The gas collecting port 612 on the guide plate 61 corresponding to the collection port 23 can specifically absorb and extract air when the collection port 23 is opened, reducing the impact of secondary volatilization of waste liquid.

[0039] like Figure 3 , Figure 4 and Figure 5 As shown, the waste liquid cap 24 is hinged to the bottom of the operating chamber 11. The bottom of the operating chamber 11 is also provided with a receiving port 111 corresponding to the waste liquid cap 24. A handle 241 is provided on the waste liquid cap 24. Before use, the waste liquid cap 24 needs to be opened by pulling open the collection port 23 using the handle 241.

[0040] The collection port 23 includes an integrally formed collection chamber 231 and a liquid passage chamber 232. The collection chamber 231 is a hollow cylinder. The liquid passage chamber 232 is located below the collection chamber 231 and is a frustum-shaped structure with its diameter decreasing from top to bottom. An L-shaped outlet pipe 25 is connected to the bottom of the liquid passage chamber 232. The top end of the outlet pipe 25 is connected to the bottom of the liquid passage chamber 232 and the other end is connected to the side wall of the collection tank 26. Waste liquid flows through the collection chamber 231 and the liquid passage chamber 232, through the outlet pipe 25, and finally into the collection tank 26, which facilitates the discharge and recycling of waste liquid.

[0041] like Figure 4 and Figure 5 As shown, the waste liquid cap 24 is also vertically slidably disposed on the rear side of the collection port 23. A sliding groove 112 is provided in the operating cavity 11 corresponding to the waste liquid cap 24. A shielding cap 233 is also slidably disposed on the collection port 23, and the shielding cap 233 is slidably disposed along the width direction of the operating cavity 11. The shielding cap 233 and the waste liquid cap 24 are connected by a connector 3. The connector 3 is disposed at both ends of the collection port 23. Each end of the connector 3 includes a driving rack 31, a transmission gear 32 and a driven rack 33. The driving rack 31 and the driven rack 33 are both meshed with the transmission gear 32 and are staggered. The driven rack 33 is disposed on the side of the driving rack 31 away from the collection port 23. The active rack 31 is arranged along the length of the waste liquid cover 24 and is positioned near the collection port 23. The transmission gear 32 is rotatably mounted in the operating cavity 11 with its axis along the length of the operating cavity 11. The driven rack 33 is fixed to the top of the shielding cover 233 and is arranged along the length of the shielding cover 233. After the waste liquid cover 24 is pulled open, it slides to the bottom along the sliding groove 112. Under the linkage of the connecting piece 3, the shielding cover 233 opens to expose the collection port 23, which facilitates the collection of waste liquid during the experiment.

[0042] During the rotation of the waste liquid cap 24, it does not contact the connecting part 3 and does not link with the cover 233. When only the waste liquid cap 24 is rotated, the cover 233 still blocks the collection port 23. When the collection port 23 needs to be used, the waste liquid cap 24 is rotated open and slid downward along the sliding groove 112. At this time, the driving rack 31 on the waste liquid cap 24 contacts the transmission gear 32 and drives it to rotate. The transmission gear 32 also meshes with the driven rack 33, thereby driving the driven rack 33 to slide in the collection port, driving the cover 233 to open and exposing the collection port 23.

[0043] like Figure 4 and Figure 5 As shown, an inlet pipe 261 extends from the side wall of the collection tank 26 corresponding to the outlet pipe 25. The diameter of the inlet pipe 261 on the side closer to the collection tank 26 is larger than the diameter on the side farther away from the collection tank 26. The inlet pipe 261 and the outlet pipe 25 are connected by a fastening member 4. The fastening member 4 includes a first fastener 41 and a second fastener 42. The first fastener 41 is sleeved on the inlet pipe 261, and the second fastener 42 is fixed to the end of the outlet pipe 25 near the inlet pipe 261. The first fastener 41 has a tightening thread, and the second fastener 42 has a fastening groove 421 corresponding to the first fastener 41. The fastening groove 421 also has a corresponding tightening thread. The first clip 41 is fitted onto the outlet pipe 25. As the collection tank 26 is sent into the storage tank 22, the first clip 41 and the second clip 42 are aligned and fastened. Then, the first clip 41 and the second clip 42 are rotated to connect with the threaded connection, thus completing the connection between the inlet pipe 261 and the outlet pipe 25.

[0044] A locking element 5 is also provided between the outlet pipe 25 and the collection tank 26. The locking element 5 is installed on the fastening element 4 and includes a locking ring groove 51 and a locking ring clip 52. The locking ring groove 51 is located at the top of the first clip 41, and the locking ring clip 52 is semi-circular and rotates along the axis of the second clip 42. After the inlet pipe 261 is connected to the outlet pipe 25, the fastening point is locked by the locking element 5. When the locking element 5 is not locked or when it is necessary to disassemble the outlet pipe 25 and the collection tank 26, the semi-circular locking ring clip 52 is located below the outlet pipe 25 and can support the connection between the outlet pipe 25 and the inlet pipe 261 to prevent waste liquid from leaking directly into the fume hood.

[0045] The working principle and usage of this fume hood with waste liquid collection are as follows: A storage tank 22 is pre-installed inside the cabinet frame 2, and an inlet rail 222 is installed. An inlet pipe 261 is installed on the side wall of the collection tank 26. The inlet pipe 261 is connected to the outlet pipe 25 via fasteners 4 and locking devices 5. A collection port 23 is opened in the operating chamber 11, and the bottom is connected to the outlet pipe 25. Before use, the waste liquid cover 24 is fully opened and slid into the bottom of the sliding groove 112, ensuring that the cover 233 is open and the collection port 23 is exposed. During use, the air collection port 612 draws air from above the collection port 23 to prevent secondary evaporation of the waste liquid. After use, the collection port 23 is closed first, and then the filter screen 613 is removed for cleaning and replacement after the exhaust fan 13 and the air supply fan 14 have stopped, making it convenient for the next use.

[0046] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A fume hood with waste liquid collection, characterized in that, The cabinet includes a cabinet (1) and a cabinet frame (2). The cabinet (1) is located above the cabinet frame (2). An operating cavity (11) is provided on the cabinet (1). An operating window (12) is vertically slidable on the front side of the operating cavity (11). Two collection ports (23) with waste liquid caps (24) are provided on the rear side of the bottom of the operating cavity (11). The collection ports (23) are arranged opposite each other at both ends in the operating cavity (11). A liquid outlet pipe (25) is connected below the collection port (23). The other end of the liquid outlet pipe (25) is connected to a liquid collection tank (26). The liquid collection tank (26) is installed on the rear side of the cabinet frame (2). A grid cabinet (21) is also provided on the front side of the cabinet frame (2).

2. The fume hood with waste liquid collection according to claim 1, characterized in that, The collection port (23) includes an integrally formed collection chamber (231) and a liquid passage chamber (232). The collection chamber (231) is a hollow cylinder. The liquid passage chamber (232) is located below the collection chamber (231) and is a frustum-shaped structure with a diameter decreasing from top to bottom. An L-shaped outlet pipe (25) is connected to the bottom of the liquid passage chamber (232). The top end of the outlet pipe (25) is connected to the bottom of the liquid passage chamber (232), and the other end is connected to the side wall of the collection tank (26). The waste liquid cover (24) is hinged to the bottom of the operating chamber (11). The bottom of the operating chamber (11) is also provided with a receiving port (111) corresponding to the waste liquid cover (24). A handle (241) is provided on the waste liquid cover (24).

3. A fume hood with waste liquid collection according to claim 2, characterized in that, The waste liquid cap (24) is also vertically slidably disposed on the rear side of the collection port (23). A sliding groove (112) is provided in the operating cavity (11) corresponding to the waste liquid cap (24). A shielding cap (233) is also slidably disposed on the collection port (23). The shielding cap (233) is slidably disposed along the width direction of the operating cavity (11). The shielding cap (233) and the waste liquid cap (24) are connected by a connector (3). The connector (3) is disposed at both ends of the collection port (23). Each end of the connector (3) includes an active rack (31), a transmission gear (32) and a driven rack (33). The active rack (31) is arranged along the length of the waste liquid cover (24) and is located near the collection port (23). The transmission gear (32) is rotatably mounted in the operating chamber (11) and its axis is arranged along the length of the operating chamber (11). The driven rack (33) is fixed to the top of the cover (233) and is arranged along the length of the cover (233).

4. A fume hood with waste liquid collection according to claim 2, characterized in that, The side wall of the liquid collection tank (26) extends an inlet pipe (261) corresponding to the outlet pipe (25). The diameter of the inlet pipe (261) on the side closer to the liquid collection tank (26) is larger than the diameter of the side of the inlet pipe (261) away from the liquid collection tank (26). The inlet pipe (261) and the outlet pipe (25) are connected by a fastening member (4). The fastening member (4) includes a first fastener (41) and a second fastener (42). The first fastener (41) is sleeved on the inlet pipe (261), and the second fastener (42) is fixed to the end of the outlet pipe (25) near the inlet pipe (261). The first fastener (41) has a tightening thread extending from it, and the second fastener (42) has a tightening groove (421) corresponding to the first fastener (41). The tightening groove (421) also has a corresponding tightening thread.

5. A fume hood with waste liquid collection according to claim 4, characterized in that, A locking element (5) is also provided between the liquid outlet pipe (25) and the liquid collection tank (26). The locking element (5) is installed on the fastening element (4). The locking element (5) includes a locking ring groove (51) and a locking ring clip (52). The locking ring groove (51) is located at the top of the first clip (41). The locking ring clip (52) is semi-circular and rotates along the axis of the second clip (42).

6. A fume hood with waste liquid collection according to claim 5, characterized in that, The cabinet (2) is also provided with a storage tank (22) corresponding to the liquid collection tank (26). The storage tank (22) is provided with an inlet and outlet (221) on the rear side. An inlet and outlet (221) is hinged at the inlet and outlet (221). Two opposite guide rails (222) are provided at the bottom of the storage tank (22).

7. A fume hood with waste liquid collection according to claim 1, characterized in that, The cabinet (1) is provided with an exhaust fan (13) and an air supply fan (14) at the top. Both the exhaust fan (13) and the air supply fan (14) are connected to the operating chamber (11). The operating chamber (11) is also provided with a guide fan (6). The guide fan (6) includes two vertically arranged guide plates (61) and a guide plate (62). The guide plate (61) is arranged parallel to the rear side wall of the operating chamber (11) and there is a gap between it and the rear side wall of the operating chamber (11). The guide plate (62) is inclinedly arranged at the top of the operating chamber (11). One end of the guide plate (62) is connected to the center of the top of the operating chamber (11), and the other end is connected to the top of the guide plate (61) on the upper side.

8. A fume hood with waste liquid collection according to claim 7, characterized in that, The guide plate (61) is fixed in the operating chamber (11) by fixing bolts. Multiple guide holes (611) are provided on the guide plate (61). The lower guide plate (61) is also provided with an air collection port (612) corresponding to the collection port (23). A filter screen (613) is fixed on the air collection port (612).

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