A laboratory fume hood with exhaust gas treatment

Abstract

The utility model discloses a laboratory ventilation device of waste gas treatment structure, including installation base plate and the exhaust fan of installation base plate lower end dismounting setting, the lower end of exhaust fan is connected with filter cover, and through fan installation ring -shaped cylinder, installation positioning lock groove, thread positioning lock rod etc. Cooperation of structure makes exhaust fan and can be independently disassembled. The installation positioning block and sliding positioning groove form the guidance, and there is no deviation jamming in dismounting, and the locking nut and locking bolt double -fixed, ensure stable and convenient quick dismounting, can regularly clean exhaust fan blade dust. The utility model discloses the filter cover inside adopts three -level composite filter structure. Waste gas impurity filter screen board intercepts solid particle first, and activated carbon adsorption filter board adsorbs organic pollutant, and two -in -one chemical filter layer handles acidic gas and organic solvent pertinently, compares traditional single straight -line exhaust mode, realizes to the full -flow purification of laboratory complex waste gas, and the discharge meets relevant environmental protection standard.

Description

Technical Field

[0001] This utility model belongs to the field of waste gas treatment technology, and specifically relates to a laboratory ventilation device with a waste gas treatment structure. Background Technology

[0002] A laboratory is a place where experiments are conducted. It is the cradle of science, the base of scientific research, and the source of technological development, playing a very important role in technological advancement. Chemical or biological experiments in laboratories produce a large amount of gases that are harmful to the human body. If the exhaust gases are not treated and ventilated in a timely manner, the health and lives of the experimental personnel will be endangered. The ventilation vents of existing laboratory ventilation devices cannot be adjusted for experimental equipment and experimental scenarios, and cannot treat and exhaust exhaust gases outdoors in a timely manner. Existing laboratory ventilation equipment generates noise when it is working, which can interfere with experimental personnel, affect experimental results, and may even lead to experimental safety accidents.

[0003] Therefore, a safety ventilation mechanism for laboratories, with announcement number "CN211903196U", includes a mounting base, a tower-shaped shell, an air intake end, a flexible connection, a guide drive assembly, a fan, and a ventilation duct. The mounting base is installed on the ceiling of the laboratory. The tower-shaped shell is located on the mounting base and has a tower-shaped structure that is wider at the top and narrower at the bottom. The air intake end is located below the tower-shaped shell and communicates with the inner cavity of the tower-shaped shell through the air intake end. The ventilation duct is embedded in the ceiling of the laboratory and passes through the mounting base and communicates with the tower-shaped shell. The guide drive assembly and the fan are both located in the tower-shaped shell. The air intake end is connected to the drive end of the guide drive assembly and, driven by the guide drive assembly, moves vertically up and down. The flexible connection enables the air intake end to extend and retract, allowing it to maintain an optimal position for collecting waste gas and to discharge pollutants denser than air.

[0004] However, for the aforementioned safety ventilation system for laboratories, although polluted gases are discharged from the laboratory sequentially through the flexible connection, tower-shaped shell, and ventilation duct, the following obvious defects still exist during use: In the later stages of exhaust gas discharge, because the fan and the mounting base plate are an integrated structure, it is impossible to remove the fan separately to clean the dust on the fan blade surface. As a result, dust falls from the duct into the laboratory during the fan's operation. Utility Model Content

[0005] The purpose of this invention is to provide a laboratory ventilation device with a waste gas treatment structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a laboratory ventilation device with a waste gas treatment structure, comprising a mounting base and an exhaust fan detachably mounted at the lower end of the mounting base. The lower end of the exhaust fan has a threaded filter cover for purifying the exhaust gas from the laboratory and is detachable. The bottom of the mounting base is provided with a fan mounting annular cylinder that facilitates the disassembly, assembly, and cleaning of the exhaust fan. The lower end face of the fan mounting annular cylinder is provided with mounting positioning grooves at equal intervals to lock the exhaust fan inside the fan mounting annular cylinder. The exhaust fan housing is provided with threaded positioning locking rods at equal intervals to lock the exhaust fan into the fan mounting annular cylinder. The bottom of the exhaust fan housing is provided with a threaded ring with an internal thread for threaded mounting of the filter cover. The lower end face of the filter cover is provided with an air inlet mesh plate that allows the waste gas from the laboratory to enter for exhaust filtration.

[0007] Preferably, the upper surface of the mounting base plate is provided with an air outlet for extracting and discharging waste gas from the laboratory. The air outlet can be connected to an exhaust pipe extending to the outside, and facilitates the disassembly and cleaning of the mounting base plate.

[0008] Preferably, the mounting positioning lock groove on the fan mounting annular cylinder has sliding positioning grooves on both sides of its inner side wall. The fan mounting annular cylinder also has evenly distributed threaded locking bolts that pass through the fan mounting annular cylinder and lock into the evenly distributed threaded holes on the surface of the exhaust fan housing. This ensures that the exhaust fan remains stable and safe within the fan mounting annular cylinder during operation and facilitates the later disassembly and assembly of the exhaust fan. It enables the exhaust fan to be positioned and installed within the fan mounting annular cylinder, ensuring that the exhaust fan is accurately installed in the designated position and is more secure and will not slip or fall off.

[0009] Preferably, the threaded positioning locking rod on the exhaust fan housing is fitted with an installation positioning block that is directionally slidably installed in the sliding positioning groove, and the threaded positioning locking rod is screwed with a locking nut at the outer end of the fan mounting annular cylinder, which enables the exhaust fan to be quickly disassembled and assembled later for cleaning dust from the exhaust fan blades.

[0010] Preferably, the filter cover is threaded inside the threaded ring, and the inside of the filter cover is provided with an activated carbon adsorption filter plate, a waste gas impurity filter screen plate, and a chemical filter layer for treating acidic waste gas and organic solvent waste gas in the laboratory, from top to bottom. This can purify and filter the discharged waste gas and prevent the waste gas from being discharged to the outside and causing air pollution.

[0011] Preferably, the inner wall of the filter cover is provided with a mounting base with a threaded hole at its center, and the mounting base is threadedly connected to a disassembly screw. The activated carbon adsorption filter plate, the waste gas impurity filter screen plate, and the chemical filter layer are sequentially installed onto the disassembly screw, and the activated carbon adsorption filter plate, the waste gas impurity filter screen plate, and the chemical filter layer are installed at equal intervals separated by threaded sleeves threaded onto the disassembly screw.

[0012] Preferably, the lower end face of the filter cover is provided with a disassembly and assembly auxiliary handle that facilitates the rotation of the filter cover from the threaded ring component, and the outer protrusion of the bottom end of the filter cover extends outward to cover the threaded ring component, thereby realizing the disassembly and assembly of the filter cover, and cleaning or replacement of the filter components after the service life expires, improving convenience.

[0013] Compared with the prior art, the technical effects and advantages of this utility model are: the laboratory ventilation device of this waste gas treatment structure,

[0014] This utility model utilizes a combination of a fan mounting ring cylinder, a mounting positioning lock groove, and a threaded positioning lock rod to allow the exhaust fan to be independently assembled and disassembled. The mounting positioning block and the sliding positioning groove form a guide, ensuring disassembly without offset or jamming; the locking nut and locking bolt provide double fixation, ensuring stable operation and facilitating quick disassembly. It also allows for regular cleaning of dust from the exhaust fan blades, completely solving the problem of dust backflow.

[0015] To address the problem of incomplete exhaust gas purification in existing ventilation systems, this utility model employs a three-stage composite filtration structure inside its filter hood. The exhaust gas impurity filter plate first intercepts solid particles; the activated carbon adsorption filter plate adsorbs organic pollutants; and the two-in-one chemical filter layer specifically treats acidic gases and organic solvents. Compared to the traditional single direct-discharge mode, this achieves full-process purification of complex laboratory exhaust gases, ensuring emissions meet relevant environmental standards.

[0016] The innovative central disassembly screw and threaded sleeve positioning structure ensures axial fixation of the three-layer filter plates and precise adjustment of the layer spacing. Combined with the disassembly and assembly auxiliary handle, a single person can quickly disassemble the entire filter cover and replace internal components. Compared to traditional fixing methods, this significantly reduces maintenance time, lowers filter replacement costs, and effectively solves the problem of inconvenient maintenance in existing equipment.

[0017] The utility model utilizes a synergistic design of mechanical positioning and sealing structure. The installation positioning lock groove and threaded positioning lock rod form a six-point positioning, ensuring high concentricity of the exhaust fan installation and reducing vibration and noise. The fan installation ring inner wall rubber ring and the bottom end of the filter cover provide double sealing, which significantly improves the sealing performance compared to the existing simple flange connection, eliminates the risk of direct discharge of unfiltered exhaust gas, and ensures stable operation of the equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 A bottom view of the annular cylinder mounting structure for the fan of this utility model;

[0020] Figure 3 This is a top view of the filter cover of this utility model.

[0021] Figure 4 This is an exploded view of the filter cover of this utility model;

[0022] Figure 5 This is an exploded view of the laboratory ventilation mechanism of this utility model.

[0023] In the diagram: 1. Mounting base plate; 2. Exhaust fan; 3. Filter cover; 4. Fan mounting ring cylinder; 5. Mounting positioning lock groove; 6. Threaded positioning lock rod; 7. Threaded ring part; 8. Air inlet mesh plate; 9. Air outlet connection port; 10. Sliding positioning groove; 11. Mounting positioning block; 12. Locking nut; 13. Waste gas impurity filter mesh plate; 14. Activated carbon adsorption filter plate; 15. Disassembly and assembly auxiliary handle; 16. Locking bolt; 17. Chemical filter layer; 18. Mounting base; 19. Disassembly and assembly screw. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-5 This utility model provides a technical solution: a laboratory ventilation device for waste gas treatment structure, including a mounting base plate 1 and an exhaust fan 2 detachably mounted at the lower end of the mounting base plate 1. The mounting base plate 1 is installed by first drilling mounting holes in the laboratory wall with a diameter matching the outer diameter of the air outlet 9, inserting the air outlet 9 into the mounting holes, sealing the mounting base plate 1 over the holes, and fixing the mounting base plate 1 to the laboratory wall or ceiling with bolts. The fan mounting ring cylinder 4 facilitates detachment and installation. The exhaust fan 2 includes a fan housing, inside which exhaust fan blades are mounted via a cross bracket. When the exhaust fan blades rotate, they generate suction force to adsorb waste gas. The lower end of the exhaust fan 2 has a threaded filter cover 3 for purifying the exhaust gas from the laboratory, allowing the waste gas to be purified and filtered before discharge without affecting the external environment. The bottom of the mounting base plate 1 has a fan mounting ring cylinder 4 that facilitates the detachment and cleaning of the exhaust fan 2, making it easier to disassemble the exhaust fan 2 later.

[0026] Exhaust fan 2 adopts the SF series axial flow exhaust fan: The SF series axial flow exhaust fan is suitable for laboratories with high air volume requirements and relatively open spaces. It has a large air volume, ranging from 1000-6000 m³ / h. 3 With a capacity of / h and a total pressure between 50-200Pa, it is suitable for rapidly discharging large amounts of waste gas. The fan uses a high-quality aluminum alloy casing, which has excellent corrosion resistance and can adapt to the complex chemical environment of the laboratory. The motor uses pure copper windings, providing strong power and high stability, enabling long-term continuous and stable operation.

[0027] Exhaust fan 2 operates primarily based on aerodynamic principles. Taking a centrifugal exhaust fan as an example, when exhaust fan 2 is powered on, the motor drives the exhaust blades to rotate at high speed. The exhaust blades typically employ a special curved surface design, generating a force on the surrounding air during rotation. Driven by the blades, air enters through the axial inlet at the center of the fan casing. Due to the rotation of the blades, the air gains centrifugal force. Under the action of centrifugal force, the air is thrown towards the edge of the fan casing, at which point the air velocity and kinetic energy increase. This allows the air to be discharged from the outlet at a higher pressure, achieving the adsorption and discharge of laboratory waste gas.

[0028] In the ventilation system of this laboratory, the exhaust fan 2 works in conjunction with other components. The adsorption airflow generated by the exhaust fan 2 draws the waste gas inside the laboratory into the filter hood 3 through the air inlet mesh. Inside the filter hood 3, the waste gas is purified sequentially through the waste gas impurity filter mesh 13, the activated carbon adsorption filter plate 14, and the chemical filter layer 17. The purified waste gas is then discharged from the air outlet 9 on the upper surface of the mounting base plate 1 by the exhaust fan 2, and is discharged into the external environment through the exhaust pipe.

[0029] The exhaust fan 2 is equipped with a built-in gas monitoring sensor to detect the treated acidic waste gas and organic solvent waste gas discharged from the system, ensuring that the treated gas does not exceed the standards. The exhaust port has an exhaust pipe with a three-way valve. One end of the three-way valve has an external pipe connected to an external gas storage tank. One end of the external pipe is connected to an external suction pump, and the other end is connected to the gas storage tank. Upon detecting excessive gas, the three-way valve reverses the flow direction, transporting the gas through the external pipe to the waste gas storage tank for centralized collection and further treatment. The three-way valve, gas monitoring sensor, and exhaust fan 2 are controlled by an external PLC controller, allowing for precise control of gas emissions and preventing the discharge of excessive gases that pollute the air.

[0030] The lower end face of the fan mounting annular cylinder 4 is provided with equidistant mounting positioning grooves 5 for locking and positioning the exhaust fan 2 inside the fan mounting annular cylinder 4. This ensures that the exhaust fan 2 is accurately positioned during installation and disassembly, preventing positional misalignment and effectively preventing the exhaust fan 2 from falling off due to vibration during operation. The outer shell of the exhaust fan 2 is provided with equidistant threaded positioning locking rods 6 for locking the exhaust fan 2 into the fan mounting annular cylinder 4. These threaded positioning locking rods 6 are used to install and lock the exhaust fan 2 into the fan mounting annular cylinder 4. Furthermore, a rubber ring is provided at the bottom end of the inner wall of the fan mounting annular cylinder 4. The rubber ring is sealed and fitted against the outer wall of the exhaust fan 2 outer shell to prevent waste gas in the laboratory from being discharged to the outside without filtration.

[0031] The bottom of the exhaust fan 2 housing is provided with a threaded ring 7 with internal threads for threaded installation of the filter cover 3. The threaded ring 7 has internal threads for threaded installation of the filter cover 3, realizing the locking and fixing of the filter cover 3 and subsequent disassembly and cleaning. The lower end face of the filter cover 3 is provided with an air inlet mesh plate 8 that allows the waste gas inside the laboratory to enter for exhaust filtration treatment. This allows the waste gas in the laboratory to enter the interior of the filter cover 3 for purification and filtration treatment, avoiding unnecessary air pollution caused by the exhaust gas being discharged to the outside.

[0032] The upper surface of the mounting base plate 1 is provided with an air outlet 9 for extracting and discharging exhaust gas from the laboratory. The air outlet 9 is installed inside the space between the ceiling and the roof in the laboratory and is easy to connect to the exhaust pipe to facilitate the exhaust of gas to the outside. The mounting positioning locking groove 5 on the fan mounting annular cylinder 4 is provided with sliding positioning grooves 10 on both sides of the inner side wall. The surface of the fan mounting annular cylinder 4 is also provided with evenly distributed threaded locking bolts 16 that pass through the fan mounting annular cylinder 4 and lock into the evenly distributed threaded holes on the surface of the exhaust fan 2. This ensures that the exhaust fan 2 remains stable and safe inside the fan mounting annular cylinder 4 during operation and facilitates the later disassembly and assembly of the exhaust fan 2. It also ensures that the exhaust fan 2 maintains positional stability during installation and prevents installation deviation.

[0033] like Figure 2 As shown, a mounting positioning block 11 is fixedly fitted onto the threaded positioning locking rod 6 on the outer shell of the exhaust fan 2. This mounting positioning block 11 can be directionally slidably installed in the sliding positioning groove 10 inside the mounting positioning locking groove 5 on the fan mounting annular cylinder 4 to ensure the accuracy of the installation position of the exhaust fan 2. The threaded positioning locking rod 6 is screwed with a locking nut 12 at the outer end of the fan mounting annular cylinder 4 to fix the exhaust fan 2 after installation, ensuring the sealing of the combination between the exhaust fan 2 and the mounting base plate 1, preventing leakage of exhaust gas, and facilitating smooth removal for cleaning during later disassembly and assembly.

[0034] like Figure 4 As shown, the filter cover 3 is equipped with, from top to bottom, an activated carbon adsorption filter plate 14, a waste gas impurity filter screen plate 13, and a chemical filter layer 17 for treating acidic waste gas and organic solvent waste gas in the laboratory. The filter cover 3 is threaded inside the threaded ring 7, allowing the filter cover 3 to be separated from the exhaust fan 2 for cleaning. The chemical filter layer 17 includes an alkaline solution filter layer, an acidic gas adsorption layer, or an organic solvent adsorption layer. For acidic waste gases, an adsorption layer can be added, which can be made of filter cotton soaked in alkali solution or a solid alkaline adsorbent. For organic solvent waste gases, an adsorption layer of activated carbon fiber or molecular sieve can be used. The chemical filtration layer 17 is a two-in-one chemical filtration structure that can filter acidic and organic solvent gases, thereby achieving multiple treatments of physical filtration, activated carbon adsorption and chemical purification, ensuring that the waste gas purification effect meets environmental protection standards. Among them, the waste gas impurity filter screen 13 is used to filter impurity particles in the waste gas; the activated carbon adsorption filter plate 14 uses coconut shell activated carbon as material and utilizes the adsorption characteristics of activated carbon to adsorb harmful gases in the waste gas.

[0035] The inner wall of the filter cover 3 is provided with a mounting base 18 with a threaded hole at its center, and a disassembly screw 19 is threadedly connected to the mounting base 18. The activated carbon adsorption filter plate 14, the waste gas impurity filter screen plate 13, and the chemical filter layer 17 are sequentially installed onto the disassembly screw 19. The activated carbon adsorption filter plate 14, the waste gas impurity filter screen plate 13, and the chemical filter layer 17 are installed at equal intervals by threaded sleeves threaded onto the disassembly screw 19, which facilitates the disassembly, replacement, or cleaning of each filter layer. In addition, different chemical filter layers 17 can be replaced to treat chemical waste gases such as acidic waste gases and organic solvent waste gases that occur in the laboratory.

[0036] The lower end face of the filter cover 3 is provided with a disassembly and assembly auxiliary handle 15, which facilitates the rotation of the filter cover 3 to remove it from the threaded ring 7, allowing the operator to easily rotate the filter cover 3 to remove it from the threaded ring 7 and then operate the internal filtration structure of the filter cover 3. The bottom end of the filter cover 3 has an outwardly extending an annular protrusion that covers the threaded ring 7.

[0037] Specifically, the principle of assembling and disassembling the exhaust fan is as follows: the assembly and disassembly of the exhaust fan 2 and the fan mounting annular cylinder 4 rely on the coordinated operation of multiple structures. During installation, the mounting positioning block 11 on the outer shell of the exhaust fan 2 is embedded into the sliding positioning groove 10 within the mounting positioning locking groove 5 of the fan mounting annular cylinder 4, sliding along the groove to achieve precise alignment and prevent displacement. After the exhaust fan 2 is embedded in place, the locking nut 12 on the outside of the threaded positioning locking rod 6, in conjunction with the locking bolt 16 on the surface of the fan mounting annular cylinder 4, firmly fixes the exhaust fan 2 to the mounting base plate 1. The rubber ring simultaneously achieves a seal to prevent exhaust gas leakage. During disassembly, the locking nut 12 and locking bolt 16 are loosened in the opposite direction, and the exhaust fan 2 can be easily pulled out by utilizing the sliding characteristics of the mounting positioning block 11 and the sliding positioning groove 10.

[0038] Filter cover 3 assembly and disassembly principle: The filter cover 3 is connected to the exhaust fan 2 by engaging the internal thread at its top with the external thread of the threaded ring 7 at the bottom of the exhaust fan 2. During disassembly, the operator can easily remove the filter cover 3 from the threaded ring 7 by rotating the filter cover 3 with the auxiliary handle 15 on the lower end face of the filter cover 3. The mounting base 18 on the inner wall of the filter cover 3 and the disassembly screw 19 form a frame. After the three-layer filter assembly is fitted into the screw, it is fixed by the threaded sleeve. By removing the nut at the bottom of the screw 19, the filter layers can be separated for replacement or cleaning.

[0039] The exhaust gas treatment mechanism of the filter cover: primary physical filtration: the exhaust gas impurity filter plate 13 is made of 304 stainless steel plate with 0.5mm mesh. It uses the principle of inertial collision and sieving to intercept solid particles with a diameter ≥5μm, so as to avoid clogging the subsequent filter layer.

[0040] Intermediate adsorption purification: The activated carbon adsorption filter plate 14 uses coconut shell activated carbon as material, which has a large specific surface area and abundant micropores. It adsorbs volatile organic compounds, odor gases and other harmful components through van der Waals forces. The adsorption capacity of toluene can reach 450mg / g.

[0041] Advanced chemical treatment: The chemical filter layer 17 adopts a two-in-one structure. The upper layer, alkaline-wetted filter cotton or solid alkaline adsorbent, undergoes a neutralization reaction with acidic gases, such as the reaction of HCl and NaOH to produce NaCl and H2O. The lower layer, activated carbon fiber felt loaded with molecular sieves, utilizes pore size matching and polarity to adsorb organic solvents such as benzene series compounds and alcohols. Furthermore, depending on the type of waste gas generated in the laboratory, the chemical filter layer 17 in the filter hood 3 can be replaced with a corresponding waste gas treatment chemical filter layer 17.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A laboratory ventilation device with a waste gas treatment structure, comprising a mounting base (1) and an exhaust fan (2) detachably mounted on the lower end of the mounting base (1), wherein the lower end of the exhaust fan (2) is threaded with a detachable filter cover (3) for purifying exhaust gas from the laboratory, characterized in that: The bottom of the mounting base plate (1) is provided with a fan mounting annular cylinder (4) which facilitates the disassembly and fixing of the exhaust fan (2) and makes cleaning easy. The lower end face of the fan mounting annular cylinder (4) is provided with mounting positioning lock grooves (5) at equal intervals to lock the exhaust fan (2) inside the fan mounting annular cylinder (4). The outer shell of the exhaust fan (2) is provided with threaded positioning lock rods (6) at equal intervals to lock the exhaust fan (2) into the fan mounting annular cylinder (4). The bottom of the outer shell of the exhaust fan (2) is provided with a threaded ring (7) with an internal thread for threaded installation on the filter cover (3). The lower end face of the filter cover (3) is provided with an air inlet mesh plate (8) that allows the waste gas inside the laboratory to enter for exhaust filtration treatment.

2. The laboratory ventilation device for waste gas treatment structure according to claim 1, characterized in that: The upper surface of the mounting base plate (1) is provided with an air outlet (9) for extracting and discharging waste gas in the laboratory.

3. The laboratory ventilation device for a waste gas treatment structure according to claim 1, characterized in that: The fan mounting annular cylinder (4) is provided with sliding positioning grooves (10) on both sides of the mounting positioning lock groove (5). The fan mounting annular cylinder (4) is also provided with threaded locking bolts (16) that pass through the fan mounting annular cylinder (4) and lock into the threaded holes provided on the surface of the exhaust fan (2). This makes the exhaust fan (2) stable and safe inside the fan mounting annular cylinder (4) when it is working, and facilitates the later disassembly and assembly of the exhaust fan (2).

4. The laboratory ventilation device for waste gas treatment structure according to claim 1, characterized in that: The exhaust fan (2) has a threaded positioning locking rod (6) on its outer shell with a mounting positioning block (11) that is directionally slidably installed in the sliding positioning groove (10). The threaded positioning locking rod (6) is screwed with a locking nut (12) at the outer end of the fan mounting annular cylinder (4), which facilitates the assembly of the exhaust fan (2) and its subsequent removal for cleaning.

5. A laboratory ventilation device for waste gas treatment structure according to claim 1, characterized in that: The filter cover (3) is threaded inside the threaded ring (7), and the filter cover (3) is provided with an activated carbon adsorption filter plate (14), a waste gas impurity filter screen plate (13), and a chemical filter layer (17) for treating acidic waste gas and organic solvent waste gas in the laboratory, from top to bottom.

6. A laboratory ventilation device for a waste gas treatment structure according to claim 5, characterized in that: The filter cover (3) has a mounting base (18) with a threaded hole at the center of its inner wall, and a disassembly screw (19) is threadedly connected to the mounting base (18). The activated carbon adsorption filter plate (14), the waste gas impurity filter screen plate (13), and the chemical filter layer (17) are sequentially installed on the disassembly screw (19), and the activated carbon adsorption filter plate (14), the waste gas impurity filter screen plate (13), and the chemical filter layer (17) are installed at equal intervals by the threaded sleeves threaded on the disassembly screw (19).

7. A laboratory ventilation device for waste gas treatment structure according to claim 1, characterized in that: The lower end face of the filter cover (3) is provided with a disassembly and assembly auxiliary handle (15) which facilitates the rotation of the filter cover (3) from the threaded ring (7) and the bottom end of the filter cover (3) extends outward to cover the outer protrusion of the ring on the threaded ring (7).

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