A laboratory desktop exhaust device

Abstract

The present application relates to the technical field of exhaust equipment, and particularly relates to a desktop exhaust device for laboratory; it comprises a box body, a placing plate, a cover body, an air extraction assembly, a filter assembly, a blowing assembly; the inner side of the cover body, the top side of the placing plate and the bottom side of the box body form a closed placing space, and the gas, dust and the like volatilized by instruments in the closed placing space are not easy to diffuse outward; the blowing assembly can extract external air and discharge the external air through the blowing port on the top side of the placing plate when the blowing assembly is started, since the blowing port is located in the closed placing space, the blowing port below the closed placing space blows air upward below the instruments, and the gas or dust volatilized by the instruments is accelerated to move upward above the closed placing space, meanwhile, the first fan above the closed placing space exhausts the air in the closed placing space, and this combination can accelerate the discharge and circulation of the gas, dust and the like, reduce the time of the gas, dust and the like staying in the closed placing space, and thus improve the efficiency.

Description

Technical Field

[0001] This invention relates to the field of ventilation equipment technology, and in particular to a desktop ventilation device for laboratory use. Background Technology

[0002] In chemical laboratories, to prevent laboratory personnel from inhaling harmful gases while operating instruments, exhaust systems are typically installed above equipment that easily generates these gases. These systems quickly filter dust, heat, volatile gases, and harmful gases produced during experiments, preventing environmental pollution and impacting the health of operators. Existing laboratory exhaust systems are generally desktop exhaust devices mounted on the lab bench. These desktop exhaust devices are usually fixed to the bench, as illustrated in patent number CN202022232633.9, which includes a bench body with an exhaust hood fixedly connected to the top. The exhaust hood exhausts air from the experimental samples above the bench. However, this fixed exhaust hood is inconvenient to move and lacks flexibility. In contrast, existing mobile exhaust devices are more flexible, such as the mobile self-cleaning ductless laboratory fume hood disclosed in patent number CN202020013302.3, where the independently mounted exhaust device can be moved more easily.

[0003] However, existing ventilation devices occupy too much space when not in use, making them inconvenient to transport and store. Furthermore, existing ventilation devices generally exhaust air from the space below by using a fan located at the top, which limits the ventilation efficiency and makes the ventilation devices generally impractical.

[0004] Based on this, the applicant is considering designing a more practical desktop exhaust system for laboratories. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is: how to provide a more practical desktop exhaust device for laboratory use.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A desktop exhaust system for laboratory use includes a housing, a placement plate, a cover, an exhaust assembly, a filter assembly, and a blower assembly.

[0008] The placement plate is jacked up and down connected to the bottom side of the box. When the placement plate is lowered, the bottom side of the box and the top side of the placement plate are spaced apart to form a placement space. When the placement plate is raised, the placement plate contacts the bottom side of the box.

[0009] The cover is connected to the box body for lifting. When the placement plate and the cover body are lowered, the bottom side of the cover body contacts the top side of the placement plate and forms a closed placement space. When the cover body is raised, the cover body is stored in the box body.

[0010] The exhaust assembly is installed in the housing with a first fan. The air inlet of the first fan is connected to the lower bottom side of the housing, and the air outlet is connected to the filter assembly.

[0011] The filter assembly is installed inside the housing and is used to filter the airflow discharged from the outlet of the first fan and discharge it from the housing.

[0012] The blower assembly draws in external air and discharges it through the blower nozzle, which is located on the top side of the placement plate and within the enclosed placement space.

[0013] The working principle and advantages of the laboratory desktop exhaust device described in this technical solution are as follows:

[0014] When using a laboratory desktop exhaust system, the lifting mechanism lowers the placement plate connected to the bottom of the enclosure, creating a space between the plate and the bottom of the enclosure for placing the instruments to be exhausted. Then, the first fan in the exhaust assembly is activated. Since the inlet of the first fan is connected to the lower part of the enclosure's bottom and the outlet is connected to the filter assembly, the fan draws air from the space below the enclosure's bottom to the filter assembly. The filter assembly filters the airflow from the outlet of the first fan and discharges it from the enclosure, thus exhausting the instruments placed in the space. To improve exhaust efficiency, two methods can be used: First, the lifting mechanism connected to the enclosure can be lowered. This creates a closed space between the inside of the cover, the top of the placement plate, and the bottom of the enclosure. Gases and dust emitted by the instruments within this closed space are less likely to diffuse outwards, allowing the first fan to exhaust the air from this space. Second, the blowing assembly can be activated. When the device is started, it can draw in external air and discharge it through the air vent on the top side of the placement plate. Since the air vent is located in the enclosed placement space, the air vent below the enclosed placement space blows air upwards from below the instrument, accelerating the movement of gases or dust emitted by the instrument upwards in the enclosed placement space. At the same time, the first fan above the enclosed placement space exhausts the air in the enclosed placement space. This combination can accelerate the emission and circulation of gases and dust, reduce the residence time of gases and dust in the enclosed placement space, and thus improve efficiency. When the cover is raised, it is stored in the box. The laboratory desktop exhaust device can be stored when not in use. The cover is raised until it is stored in the box, and then the placement plate is raised until it contacts the bottom of the box, thereby reducing the overall space occupied by the laboratory desktop exhaust device and facilitating storage and transportation. Compared with the exhaust devices in the prior art, this solution is more practical.

[0015] Furthermore, the box is fitted with a plurality of first telescopic members, the telescopic ends of which are fixedly connected to the placement plate.

[0016] Furthermore, the blower assembly includes an air inlet chamber formed in the housing, a second fan, a connecting chamber formed in the cover, and an air duct formed on the bottom side of the placement plate.

[0017] The air inlet cavity includes a port one opened on the side wall of the housing and a port two opened on the bottom side of the housing; a second fan is installed in the port one, the air inlet end of the second fan is connected to the outside of the housing, and the air outlet end is connected to the inside of the air inlet cavity;

[0018] The cover is lifted and connected inside the air inlet cavity, the second port allows the cover to pass through, the top side of the connecting cavity is connected to the air inlet cavity, and the bottom side is located directly above the air duct;

[0019] The air duct is connected to the air outlet; when the second fan is started and the top side of the placement plate on the bottom side of the cover is in contact, the second fan draws in external air and allows it to pass through the air inlet cavity, the connecting cavity, the air duct in sequence and be discharged from the air outlet.

[0020] Furthermore, a dust filter plate is provided at the air inlet end of the second fan.

[0021] Furthermore, the cover includes two first enclosures and two second enclosures spaced apart, the two first enclosures being movably connected inside the two second enclosures, and the space between the two first enclosures and the two second enclosures forming the communicating cavity.

[0022] Furthermore, the placement plate inside the air duct forms a blower plate, the air outlet is disposed on the blower plate, and the bottom side of the blower plate is a blower cavity connecting the air duct and the air outlet.

[0023] Furthermore, the exhaust assembly includes an exhaust port and an air collection hood disposed on the bottom side of the housing;

[0024] The first fan is installed inside the exhaust vent;

[0025] The gas collection hood includes a second telescopic component fixedly connected to the box body and several stacked movable rings; two adjacent movable rings are connected in a lifting manner, the innermost movable ring is fixedly connected to the exhaust port, and the outermost movable ring is fixedly connected to the telescopic end of the second telescopic component.

[0026] Furthermore, each of the movable rings has a limiting groove on its outer side where it contacts another movable ring, and a limiting block on its inner side where it contacts another movable ring, with the limiting block movably disposed within the limiting groove.

[0027] Furthermore, the filter assembly includes an exhaust chamber opened on the top side of the housing and a filter box that is lifted and lowered inside the exhaust chamber; the bottom side of the exhaust chamber is connected to the air outlet of the first fan, and several filter plates are movably and detachably connected inside the filter box.

[0028] Furthermore, the cover is made of a transparent material. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of a desktop exhaust system for laboratories according to an embodiment of the present invention. Figure 1 (When fully stored);

[0030] Figure 2 This is a three-dimensional structural diagram of a desktop exhaust system for laboratories according to an embodiment of the present invention. Figure 1 (When the placement plate and gas collection hood are deployed);

[0031] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0032] Figure 4 This is a three-dimensional structural diagram of a desktop exhaust system for laboratories according to an embodiment of the present invention. Figure 1 (When the placement plate, gas collection hood, and hood are deployed);

[0033] Figure 5 for Figure 1 A schematic diagram of the frontal cross-sectional structure;

[0034] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0035] Figure 7 for Figure 4 A schematic diagram of the frontal cross-sectional structure;

[0036] Figure 8 This is a front view structural diagram of a desktop exhaust device for laboratory use according to an embodiment of the present invention (with the filter box extended);

[0037] Figure 9 This is a schematic diagram showing the connection between the first enclosure plate and the second enclosure plate in an embodiment of the present invention;

[0038] Figure 10 This is a top cross-sectional view of the cover structure according to an embodiment of the present invention;

[0039] Figure 11 for Figure 10 Enlarged view of point C in the middle;

[0040] In the above attached diagram: 100, box body;

[0041] 210. First telescopic component; 220. Placement plate; 221. Air duct; 222. First connecting block; 230. Air blowing plate; 231. Air blowing outlet; 240. Air blowing cavity;

[0042] 310. Air inlet cavity; 320. Dust filter plate; 330. Second fan; 340. Magnetic component; 350. Cover; 351. First enclosure plate; 3511. First extension; 352. Second enclosure plate; 3521. Second extension; 353. Second connecting block; 360. Connecting cavity;

[0043] 410. Exhaust chamber; 420. First fan; 430. Air collection hood; 431. Movable ring; 4311. Restriction groove; 4312. Restriction block; 440. Lifting plate; 450. Second telescopic component; 460. Storage chamber;

[0044] 510. Third telescopic component; 520. Filter box; 521. Snap-fit ​​strip; 522. Opening and closing cover; 531. First filter plate; 532. Second filter plate; 533. Third filter plate. Detailed Implementation

[0045] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] Refer to together Figures 1 to 11 This embodiment provides a desktop exhaust device for laboratory use, which includes a housing 100, a placement plate 220, a cover 350, an exhaust assembly, a filter assembly, and a blower assembly;

[0047] The placement plate 220 is detachably connected to the bottom side of the box 100. When the placement plate 220 is lowered, the bottom side of the box 100 and the top side of the placement plate 220 are spaced apart to form a placement space. When the placement plate 220 is raised, the placement plate 220 contacts the bottom side of the box 100.

[0048] The cover 350 is connected to the box 100 in a lifting manner. When the placement plate 220 and the cover 350 are lowered, the bottom side of the cover 350 contacts the top side of the placement plate 220 and forms a closed placement space. When the cover 350 is raised, the cover 350 is stored in the box 100.

[0049] The exhaust assembly is installed inside the housing 100 with a first fan 420. The air inlet of the first fan 420 is connected to the lower bottom side of the housing 100, and the air outlet is connected to the filter assembly.

[0050] The filter assembly is installed inside the housing 100. The filter assembly is used to filter the airflow discharged from the outlet of the first fan 420 and discharge it out of the housing 100.

[0051] The blower assembly draws in outside air and discharges it through the blower nozzle 231, which is located on the top side of the placement plate 220 and within the enclosed placement space.

[0052] In this embodiment, when the laboratory desktop exhaust device is in use, the placement plate 220 connected to the bottom side of the housing 100 is lowered by controlling the lifting mechanism. The placement space between the placement plate 220 and the bottom side of the housing 100 is used to place the instruments to be exhausted. Then, the first fan 420 in the exhaust assembly is started. Since the air inlet of the first fan 420 is connected to the lower bottom side of the housing 100 and the air outlet is connected to the filter assembly, the first fan 420 can deliver the air in the placement space below the bottom side of the housing 100 to the filter assembly when it is started. The filter assembly filters the airflow discharged from the outlet of the first fan 420 and discharges it into the housing 100; thereby exhausting the instruments placed in the placement space. To improve exhaust efficiency, one method is to control the lifting and lowering of the cover 350 connected inside the housing 100. At this time, the inner side of the cover 350, the top side of the placement plate 220, and the bottom side of the housing 100 form a closed placement space. Gases and dust emitted by the instruments within this closed space are less likely to diffuse outwards, and the first fan 420 exhausts the air from the closed placement space. Another method is... The blowing assembly can be activated, drawing in outside air and discharging it through the air outlet 231 on the top side of the placement plate 220. Since the air outlet 231 is located within the enclosed placement space, the air outlet 231 below the enclosed placement space blows air upwards from below the instrument, accelerating the movement of gases or dust emitted by the instrument upwards within the enclosed placement space. Simultaneously, the first fan 420 above the enclosed placement space exhausts air from the enclosed placement space. This combination accelerates the emission and circulation of gases and dust, reducing [the risk of contamination]. The time that gases and dust remain in the enclosed space is reduced, thereby improving efficiency; when the cover 350 rises, it is stored inside the box 100; the laboratory desktop exhaust device can be stored when not in use by controlling the cover 350 to rise until it is stored inside the box 100, and then controlling the placement plate 220 to rise until the placement plate 220 contacts the bottom side of the box 100, thereby reducing the overall space occupied by the laboratory desktop exhaust device and facilitating storage and transportation; compared with the exhaust devices in the prior art, this solution is more practical.

[0053] Preferably, such as Figure 2 , Figure 4 as well as Figure 6As shown, the housing 100 is equipped with several first telescopic components 210. The telescopic ends of the first telescopic components 210 are fixedly connected to the placement plate 220. When the first telescopic components 210 are activated, the placement plate 220 is raised or lowered by the extension and retraction of their telescopic ends.

[0054] Preferably, such as Figures 2-6 As shown, the blower assembly includes an air inlet chamber 310 opened in the housing 100, a second blower 330, a connecting chamber 360 opened in the cover 350, and an air duct 221 opened on the bottom side of the placement plate 220.

[0055] The air inlet cavity 310 includes a port one opened on the side wall of the housing 100 and a port two opened on the bottom side of the housing 100; a second fan 330 is installed in the port one, the air inlet end of the second fan 330 is connected to the outside of the housing 100, and the air outlet end is connected to the inside of the air inlet cavity 310; when the second fan 330 is started, its air inlet end draws air from the outside of the housing 100 and discharges it into the air inlet cavity 310 through its air outlet end.

[0056] The cover 350 is connected to the air inlet cavity 310 inside the box 100, and the second port of the air inlet cavity 310 allows the cover 350 to pass through, so that the cover 350 can be stored inside the box 100 when it rises and can be placed on the placement plate 220 below the box 100 when it falls; the top side of the connecting cavity 360 inside the cover 350 is connected to the air inlet cavity 310, and the bottom side is located directly above the air duct 221, so that the air in the air inlet cavity 310 can be transported from top to bottom through the connecting cavity 360 inside the cover 350.

[0057] The air duct 221 is connected to the air outlet 231. When the second fan 330 is started and the bottom side of the cover 350 contacts the top side of the placement plate 220, the second fan 330 draws in external air and allows it to pass through the air inlet cavity 310, the connecting cavity 360, the air duct 221 in sequence and be discharged from the air outlet 231. The second fan 330 in the air blowing assembly is set inside the box 100, and the air outlet 231 is blown by the cooperation of the air inlet cavity 310, the connecting cavity 360 inside the cover 350 and the air duct 221 of the placement plate 220. The arrangement is reasonable and makes good use of the existing components of the laboratory desktop exhaust device to realize the function of the exhaust assembly.

[0058] Preferably, such as Figure 1 , Figure 2 , Figure 4 , Figure 5 as well as Figure 6 As shown, the air inlet of the second fan 330 is equipped with a dust filter plate 320. The dust filter plate 320 can filter the air entering the second fan 330 and prevent dust and debris from entering the second fan 330 as much as possible.

[0059] Preferably, such as Figure 4 , Figure 5 , Figure 6 as well as Figure 8 As shown, the cover 350 includes two first enclosure plates 351 and two second enclosure plates 352 spaced apart. The two first enclosure plates 351 are movably connected inside the two second enclosure plates 352, and the space between the two first enclosure plates 351 and the two second enclosure plates 352 forms a communicating cavity 360. The two first enclosure plates 351 and the two second enclosure plates 352 form a retractable cover 350. Specifically, the top sides of the two first enclosure plates 351 and the bottom sides of the two second enclosure plates 352 are fixedly connected by several spaced second connecting blocks 353, so that the two first enclosure plates 351 and the two second enclosure plates 352 are fixedly connected without affecting the airflow through the communicating cavity 360. More specifically, the bottom of the two first enclosure plates 351 and the bottom of the bottom are provided with an extension The first extension 3511 extends inward, and the top of the two second enclosures 352 are provided with second extensions 3521 extending inward. The cooperation between the top first extension 3511 and the air inlet cavity 310 can prevent the cover 350 from detaching from the box 100. The cooperation between the bottom first extension 3511 and the second extension 3521 can prevent the first enclosure 351 and the second enclosure 352 from detaching. Furthermore, the first extension 3511 and the second extension 3521 are magnetically attracted to each other, so that the cover 350 can be kept in an unfolded or retracted state. The air inlet cavity 310 is also provided with a magnetic element 340 that is magnetically attracted to the first extension 3511, so that the cover 350 can be kept retracted in the box 100. The magnetic element 340 can be an electromagnet in the prior art.

[0060] Preferably, such as Figure 2 , Figure 3 , Figure 5 , Figure 6 as well as Figure 7 As shown, the placement plate 220 inside the air duct 221 forms a blowing plate 230, and the air outlet 231 is set on the blowing plate 230. The bottom side of the blowing plate 230 is a blowing cavity 240 connecting the air duct 221 and the air outlet 231. When the connecting cavity 360 delivers airflow to the air duct 221, the airflow enters the blowing cavity 240 and is discharged through the air outlet 231. Specifically, the blowing plate 230 inside the air duct 221 is fixedly connected to the placement plate 220 outside the air duct 221 through the first connecting block 222.

[0061] Preferably, such as Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 10 as well as Figure 11 As shown, the exhaust assembly includes an exhaust port located on the bottom side of the housing 100 and an air collection hood 430.

[0062] The first fan 420 is installed inside the exhaust vent; when the first fan 420 is started, it can draw air from the bottom of the housing 100.

[0063] The air collection hood 430 includes a second telescopic member 450 fixedly connected inside the housing 100 and several stacked movable rings 431. Adjacent movable rings 431 are connected in a lifting manner, with the innermost movable ring 431 fixedly connected to the exhaust port and the outermost movable ring 431 fixedly connected to the telescopic end of the second telescopic member 450. Except for the innermost movable ring 431 fixedly connected to the exhaust port, all movable rings 431 can form a funnel-shaped unfolded state when lowered and a disc-shaped retracted state when raised. In the unfolded state, the air collection hood 430 allows the first fan 420 to more concentratedly draw air from below the air collection hood 430, improving exhaust efficiency. In the retracted state, the air collection hood 430 does not affect the overall retraction of the exhaust device. Specifically, a retractable cavity 460 is provided on the bottom side of the housing 100 to accommodate the retracted air collection hood 430. 30; More specifically, the outermost movable ring 431 is fixedly connected to the lifting plate 440, and the telescopic end of the second telescopic member 450 is fixedly connected to the lifting plate 440. Thus, when the telescopic end of the second telescopic member 450 extends or retracts, it drives the outermost movable ring 431 and its inner movable ring 431 to rise or fall. More specifically, each movable ring 431 has a limiting groove 4311 on the outer side that contacts another movable ring 431, and a limiting block 4312 on the inner side that contacts another movable ring 431. The limiting block 4312 is movably disposed in the limiting groove 4311. When the outermost movable ring 431 rises or falls, it can form a chain reaction through the cooperation of the limiting block 4312 and the limiting groove 4311, allowing the movable rings except the innermost movable ring 431 to rise or fall sequentially, without the need to set a separate telescopic member for each movable ring 431 for driving.

[0064] Preferably, such as Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 7 as well as Figure 8As shown, the filter assembly includes an exhaust chamber 410 located on the top side of the housing 100 and a filter box 520 that is vertically mounted within the exhaust chamber 410. The bottom of the exhaust chamber 410 is connected to the air outlet of the first fan 420. Several filter plates are detachably connected inside the filter box 520. The air outlet of the first fan 420 exhausts air into the exhaust chamber 410, which is filtered by the filter plates inside the filter box 520 before being discharged. The vertically mounted filter box 520 can extend outside the housing 100, facilitating the replacement of the detachably mounted filter plates. Specifically, a third telescopic member 510 is fixedly connected inside the exhaust chamber 410. The telescopic end of the third telescopic member 510 is fixedly connected to the bottom of the filter box 520. The bottom of the filter box 520 is connected to the exhaust chamber 410. The filter box 520 has a 10-way connection and an exhaust port at the top. Inside, on opposite sides, there are snap-fit ​​structures consisting of two spaced-apart snap-fit ​​strips 521. The gap between the snap-fit ​​strips 521 is used to snap onto the edges of the filter plates, facilitating filter plate replacement and installation. More specifically, the exhaust port is equipped with an opening and closing cover 522. Inside the filter box 520, from bottom to top, are arranged a first filter plate 531, a second filter plate 532, and a third filter plate 533. The first filter plate 531 is a high-efficiency filter plate, the second filter plate 532 is an activated carbon filter plate, and the third filter plate 533 is a synthetic fiber filter plate, capable of fully filtering the airflow. Of course, other filter materials can be selected according to the design requirements.

[0065] Preferably, the cover 350 is made of transparent material, which allows users to observe the inside of the cover 350 in real time.

[0066] Specifically, the first telescopic member 210, the second telescopic member 450, and the third telescopic member 510 can all be electric telescopic rods from the prior art.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A desktop exhaust system for laboratory use, characterized in that, Includes housing, placement panel, cover, exhaust assembly, filter assembly, and blower assembly; The placement plate is jacked up and down connected to the bottom side of the box. When the placement plate is lowered, the bottom side of the box and the top side of the placement plate are spaced apart to form a placement space. When the placement plate is raised, the placement plate contacts the bottom side of the box. The cover is connected to the box body for lifting. When the placement plate and the cover are lowered, the bottom side of the cover contacts the top side of the placement plate and forms a closed placement space. When the cover is raised, the cover is housed inside the box. The exhaust assembly is installed in the housing with a first fan. The air inlet of the first fan is connected to the lower bottom side of the housing, and the air outlet is connected to the filter assembly. The filter assembly is installed inside the housing and is used to filter the airflow discharged from the outlet of the first fan and discharge it from the housing. The air blowing assembly draws in external air and discharges it through the air blowing port, which is located on the top side of the placement plate and within the enclosed placement space. The blowing assembly includes an air inlet chamber formed in the housing, a second fan, a connecting chamber formed in the cover, and an air duct formed on the bottom side of the placement plate. The air inlet cavity includes a port one opened on the side wall of the housing and a port two opened on the bottom side of the housing; a second fan is installed in the port one, the air inlet end of the second fan is connected to the outside of the housing, and the air outlet end is connected to the inside of the air inlet cavity; The cover is lifted and connected inside the air inlet cavity, the second port allows the cover to pass through, the top side of the connecting cavity is connected to the air inlet cavity, and the bottom side is located directly above the air duct; The air duct is connected to the air outlet; when the second fan is started and the top side of the placement plate on the bottom side of the cover is in contact, the second fan draws in external air and allows it to pass through the air inlet cavity, the connecting cavity, the air duct in sequence and be discharged from the air outlet.

2. The desktop exhaust device for laboratory use as described in claim 1, characterized in that, The box is fitted with a plurality of first telescopic components, the telescopic ends of which are fixedly connected to the placement plate.

3. A desktop exhaust system for laboratory use as described in claim 1, characterized in that, The second fan is equipped with a dust filter plate at the air inlet.

4. A desktop exhaust system for laboratory use as described in claim 1, characterized in that, The cover includes two first enclosures and two second enclosures spaced apart. The two first enclosures are movably connected inside the two second enclosures, and the space between the two first enclosures and the two second enclosures forms the communicating cavity.

5. A desktop exhaust system for laboratory use as described in claim 1, characterized in that, The placement plate inside the air duct forms a blower plate, the air outlet is disposed on the blower plate, and the bottom side of the blower plate is a blower cavity connecting the air duct and the air outlet.

6. A desktop exhaust system for laboratory use as described in claim 1, characterized in that, The exhaust assembly includes an exhaust port and an air collection hood disposed on the bottom side of the housing; The first fan is installed inside the exhaust vent; The gas collection hood includes a second telescopic component fixedly connected to the box body and several stacked movable rings; two adjacent movable rings are connected in a lifting manner, the innermost movable ring is fixedly connected to the exhaust port, and the outermost movable ring is fixedly connected to the telescopic end of the second telescopic component.

7. A desktop exhaust system for laboratory use as described in claim 6, characterized in that, Each of the movable rings has a limiting groove on its outer side where it contacts another movable ring, and a limiting block on its inner side where it contacts another movable ring, with the limiting block movably disposed within the limiting groove.

8. A desktop exhaust system for laboratory use as described in claim 1, characterized in that, The filtration assembly includes an exhaust chamber located on the top side of the housing and a filter box that is vertically mounted inside the exhaust chamber; the bottom side of the exhaust chamber is connected to the air outlet of the first fan, and several filter plates are movably and detachably connected inside the filter box.

9. A desktop exhaust system for laboratory use as described in any one of claims 1 to 8, characterized in that, The cover is made of a transparent material.

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