A low-noise automated ventilation and purification device for use in chemical laboratories dealing with hazardous gases

Abstract

This invention relates to the field of laboratory gas treatment equipment technology, specifically a low-noise automated ventilation and purification device for hazardous gas chemical laboratories. The device includes a ventilation mechanism, which comprises a mounting plate. An outer cover is fixedly connected to one side of the mounting plate, and a filter cleaning mechanism is fixedly connected inside the outer cover. The filter cleaning mechanism is connected to the mounting plate through a ventilation opening, which is located on the mounting plate. A rotating mechanism is located above the filter cleaning mechanism. In this invention, the activated carbon particles at the ventilation opening lose their methane adsorption capacity after prolonged use. Therefore, when the motor starts, it drives the activated carbon particles on the lifting plate, the activated carbon particles on the rotating plate, and the filled activated carbon particles to deflect as a whole. This causes the activated carbon particles that were previously far from the ventilation opening and had a stronger methane adsorption capacity to move closer to the ventilation opening, thereby improving the methane adsorption effect and avoiding waste of activated carbon particles.

Description

Technical Field

[0001] This invention relates to the field of laboratory gas treatment equipment technology, specifically a low-noise automated ventilation and purification device for use in chemical laboratories dealing with harmful gases. Background Technology

[0002] Laboratory automated ventilation and cleaning systems are devices designed to control ventilation and cleaning in laboratory environments, ensuring that parameters such as air quality, temperature, and humidity remain within safe ranges. These systems are commonly used in chemical, biological, and pharmaceutical laboratories to protect the safety of laboratory personnel and ensure the accuracy of experimental results.

[0003] Publication number CN117463110A discloses an activated carbon air purification device. This device uses two pushers to push activated carbon within a filter ring towards a fixed block, causing the activated carbon to accumulate on both sides of the fixed block, forming a fan-shaped area between the two pushers. When a large amount of flue gas is drawn in, it passes through this fan-shaped area with the abundant activated carbon, allowing for thorough purification. However, in actual use, the activated carbon needs to be replaced multiple times. During replacement, it is often found that some activated carbon is not fully utilized due to insufficient contact with harmful gases, leading to waste. This is mainly because the activated carbon near the air inlet has a higher chance of contact with harmful gases, causing the activated carbon at the head of the filter box to lose its ability to absorb harmful gases more quickly, while the activated carbon at the tail end is not fully utilized. Users often replace the filter box at this point, resulting in inefficient use of the activated carbon.

[0004] In view of this, the present invention proposes a low-noise automated ventilation and purification device for use in chemical laboratories dealing with harmful gases, thereby solving the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] A low-noise automated ventilation and purification device for a hazardous gas chemical laboratory includes a ventilation mechanism. The ventilation mechanism includes a mounting plate, an outer cover is fixedly connected to one side of the mounting plate, and a filter cleaning mechanism is fixedly connected inside the outer cover. The filter cleaning mechanism is connected to the mounting plate through a vent, the vent is located on the mounting plate, and a rotating mechanism is provided above the filter cleaning mechanism.

[0007] The filtration and cleaning mechanism includes a filter barrel, which is fixedly connected to the inside of the outer cover. The filter barrel is equipped with multiple adsorption structures, which are equidistantly arranged from top to bottom inside the filter barrel. The side of the filter barrel near the mounting plate is equipped with an air inlet screen for the entry of air from inside the laboratory, and the side of the filter barrel away from the mounting plate is equipped with an air outlet screen for the exhaust of air from inside the laboratory. The vent and the air inlet screen are connected.

[0008] The adsorption structure includes a rotating disk that is rotatably connected inside the filter barrel. The outer edge of the rotating disk extends into the inner wall of the filter barrel. A lifting disk is provided above the rotating disk. The outer edge of the lifting disk slides against the inner wall of the filter barrel. The lifting disk and the rotating disk abut against each other. A sieve hole is provided at the center of the lifting disk. A discharge hole is provided at the center of the rotating disk. The sieve hole and the discharge hole are connected.

[0009] As a preferred embodiment of the low-noise automated ventilation and purification device for hazardous gas chemical laboratories provided by the present invention, mounting bolts are provided at the four corners of the mounting plate for easy installation of the entire device on the wall.

[0010] As a preferred embodiment of the present invention, a low-noise automated ventilation and purification device for a hazardous gas chemical laboratory is provided, wherein an exhaust duct is provided at the end of the outer cover away from the mounting plate, the exhaust duct is connected to the interior of the outer cover, and an exhaust fan is provided inside the exhaust duct.

[0011] As a preferred embodiment of the low-noise automated ventilation and purification device for a hazardous gas chemical laboratory provided by the present invention, the rotating mechanism includes a connecting rod that fixes multiple rotating disks in series from top to bottom, and the connecting rod is slidably connected to multiple lifting disks from top to bottom.

[0012] As a preferred embodiment of the low-noise automated ventilation and purification device for hazardous gas chemical laboratories provided by the present invention, the rotating mechanism further includes a motor, which is fixedly connected to the top of the filter barrel. The output shaft of the motor extends downward through the filter barrel and is fixedly connected to the turntable. A connecting rod is fixedly connected to the lower end face of the turntable.

[0013] As a preferred embodiment of the low-noise automated ventilation and purification device for hazardous gas chemical laboratories provided by the present invention, the connecting rod is further provided with an adjustment mechanism. The adjustment mechanism includes a connecting sleeve, the lower end of which is fixedly connected to the lifting plate, and the upper end of which is fixedly connected to a hanging spring. The upper end of the hanging spring is fixedly connected to the lower end face of the turntable. A hanging sleeve is slidably fitted on the upper part of the connecting sleeve, and the upper end of the hanging sleeve is fixedly connected to the lower end face of the turntable. The hanging spring, the hanging sleeve, and the connecting sleeve are all nested and slidably connected to the outside of the connecting rod.

[0014] As a preferred embodiment of the low-noise automated ventilation and purification device for chemical laboratories using hazardous gases provided by the present invention, a folding curtain is fixedly connected to the outer edge of the lower end face of the lifting plate, and the lower end of the folding curtain is fixedly connected to the upper end face of the rotating plate. The folding curtain can be stretched and folded.

[0015] As a preferred embodiment of the low-noise automated ventilation and purification device for a hazardous gas chemical laboratory provided by the present invention, the lifting plate is filled with activated carbon particles for absorbing methane gas.

[0016] As a preferred embodiment of the low-noise automated ventilation and purification device for hazardous gas chemical laboratories provided by the present invention, a side door for replacing activated carbon particles is provided on one side of the filter barrel.

[0017] As a preferred embodiment of the low-noise automated ventilation and purification device for hazardous gas chemical laboratories provided by the present invention, both the lifting plate and the rotating plate are configured as V-shaped structures. In the filter barrel, the area formed by the upper rotating plate and the lower lifting plate is V-shaped, and this area is filled with activated carbon particles.

[0018] The beneficial effects of this invention are:

[0019] In this invention, the activated carbon particles at the vent reduce their methane adsorption capacity after prolonged use, while those farther from the vent have a stronger methane adsorption capacity. Therefore, when the motor starts, it causes the activated carbon particles on the lifting plate, rotating plate, and filling material to deflect as a whole. This brings the previously distant, stronger methane-adsorbing activated carbon particles closer to the vent, improving methane adsorption and preventing waste. During use, the activated carbon particles break down and eventually fall to the bottom of the filter tank. Removing these smaller particles leaves only the stronger adsorption particles in the lifting plate, further improving methane filtration. Simultaneously, the reduced number of activated carbon particles on the lifting plate lightens the weight of the particles above it. The mounting spring contracts, causing the lifting plate particles to move upwards towards the rotating plate particles above, compressing the gaps on the surface of the activated carbon particles and preventing methane-laden air from escaping directly through these gaps. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] in:

[0022] Figure 1 A schematic diagram of the overall structure of a low-noise automated ventilation and purification device for use in a chemical laboratory for hazardous gases.

[0023] Figure 2 This is a schematic diagram of the connection structure of the ventilation mechanism in a low-noise automated ventilation and purification device for a hazardous gas chemical laboratory.

[0024] Figure 3 This is a schematic diagram of the internal connection structure of the filter cartridge in a low-noise automated ventilation and purification device for a hazardous gas chemical laboratory.

[0025] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A;

[0026] Figure 5 This is a schematic diagram of the connection structure between the filtration and cleaning mechanism and the rotating mechanism in a low-noise automated ventilation and purification device for a hazardous gas chemical laboratory.

[0027] Figure 6 This is a schematic diagram of the connection structure of the adjustment mechanism in a low-noise automated ventilation and purification device for a hazardous gas chemical laboratory.

[0028] Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point B;

[0029] Figure 8 This is a schematic diagram of the connection structure of the adsorption structure, folded curtain, and activated carbon particles in a low-noise automated ventilation and purification device for a hazardous gas chemical laboratory.

[0030] In the picture:

[0031] 1. Ventilation mechanism; 11. Mounting plate; 12. Mounting bolts; 13. Outer cover; 14. Ventilation opening; 15. Exhaust duct; 16. Exhaust fan;

[0032] 2. Filtration and cleaning mechanism; 21. Filter barrel; 22. Adsorption structure; 221. Lifting plate; 222. Rotating plate; 223. Screen holes; 224. Discharge hole; 23. Inlet air baffle; 24. Outlet air baffle; 25. Side door

[0033] 3. Rotating mechanism; 31. Motor; 32. Turntable; 33. Connecting rod;

[0034] 4. Adjustment mechanism; 41. Connecting sleeve; 42. Hanging spring; 43. Hanging sleeve; 44. Folding curtain;

[0035] 99. Activated carbon granules. Detailed Implementation

[0036] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0037] Example

[0038] like Figure 1 , Figure 3 , Figure 5 , Figure 6 and Figure 8 As shown, a low-noise automated ventilation and purification device for a hazardous gas chemical laboratory includes a ventilation mechanism 1. The ventilation mechanism 1 includes a mounting plate 11. An outer cover 13 is fixedly connected to one side of the mounting plate 11. A filter cleaning mechanism 2 is fixedly connected inside the outer cover 13. The filter cleaning mechanism 2 is connected to the mounting plate 11 through a ventilation port 14. The ventilation port 14 is set on the mounting plate 11. A rotating mechanism 3 is provided above the filter cleaning mechanism 2.

[0039] The filtration and cleaning mechanism 2 includes a filter barrel 21, which is fixedly connected to the inside of the outer cover 13. The filter barrel 21 is provided with multiple adsorption structures 22, which are equidistantly arranged from top to bottom inside the filter barrel 21. The side of the filter barrel 21 near the mounting plate 11 is provided with an air inlet screen 23 for the entry of air from inside the laboratory, and the side of the filter barrel 21 away from the mounting plate 11 is provided with an air outlet screen 24 for the exhaust of air from inside the laboratory. The vent 14 and the air inlet screen 23 are connected.

[0040] The adsorption structure 22 includes a rotating disk 222, which is rotatably connected inside the filter barrel 21. The outer edge of the rotating disk 222 extends into the inner wall of the filter barrel 21. A lifting disk 221 is provided above the rotating disk 222. The outer edge of the lifting disk 221 slides against the inner wall of the filter barrel 21. The lifting disk 221 and the rotating disk 222 abut against each other. A sieve hole 223 is provided at the center of the lifting disk 221, and a discharge hole 224 is provided at the center of the rotating disk 222. The sieve hole 223 and the discharge hole 224 are interconnected.

[0041] The lifting plate 221 is filled with activated carbon particles 99 for absorbing methane gas; the activated carbon particles 99 can effectively remove methane from the air, thereby reducing the methane content in the exhaust air and preventing the emission of harmful gases.

[0042] The filter canister 21 has a side door 25 for replacing activated carbon granules 99. After prolonged use, the activated carbon granules 99 will have reduced ability to remove methane. The side door 25 can be opened in time to empty the used activated carbon granules 99 and replace them with new activated carbon granules 99.

[0043] Both the lifting plate 221 and the rotating plate 222 are designed with a V-shaped structure. In the filter tank 21, the area formed by the upper rotating plate 222 and the lower lifting plate 221 is V-shaped, and this area is filled with activated carbon particles 99. Figure 8 As shown, during air filtration, air enters the V-shaped activated carbon particle 99 area from the left and exits from the right. It's important to note that methane is less dense than air, so after entering the V-shaped area, it moves upwards. The rotating disk 222 above the V-shaped area prevents the methane from escaping. Furthermore, because the front half of the V-shaped area is an inclined channel, the residence time of methane and air within this section is increased, allowing the activated carbon particles 99 to better absorb the methane in the air. After passing through the middle of the V-shaped area, the air passes through the rear half, which is an inverted inclined channel, allowing the air to pass through more quickly. This accelerates the flow of filtered gas and improves filtration efficiency.

[0044] In this embodiment, when ventilation is required, the exhaust fan 16 starts and generates suction. The indoor air enters the interior of the filter barrel 21 through the vent 14 and the air inlet screen 23. After the indoor air is filtered by the activated carbon particles 99 in the adsorption structure 22, the methane in the indoor air is absorbed by the activated carbon particles 99. Then the filtered air enters the exhaust duct 15 through the air outlet screen 24 and is finally discharged outdoors.

[0045] like Figure 1 , Figure 2 and Figure 3 As shown, mounting bolts 12 are provided at the four corners of the mounting plate 11 for installation, making it convenient to install the entire device on the wall.

[0046] An exhaust duct 15 is provided at the end of the outer cover 13 away from the mounting plate 11. The exhaust duct 15 is connected to the interior of the outer cover 13, and an exhaust fan 16 is provided inside the exhaust duct 15.

[0047] In this embodiment, the side of the mounting plate 11 away from the outer cover 13 is installed indoors and then fixed with mounting bolts 12. When ventilation is required, the exhaust fan 16 is turned on. After the exhaust fan 16 is started, it draws indoor air into the exhaust duct 15 and then exhausts indoor air. The indoor air passes through the vent 14, the outer cover 13 and the exhaust duct 15 in sequence.

[0048] like Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the rotating mechanism 3 includes a connecting rod 33, which connects multiple rotating disks 222 in series from top to bottom. The connecting rod 33 is also slidably connected to multiple lifting disks 221 from top to bottom. The rotating disks 222 are connected in series by the connecting rod 33 to form a whole, which is driven to rotate by the motor 31. The lifting disk 221 is a single whole that can move up and down along the connecting rod 33. The lifting disk 221 also rotates with the rotating disks 222. The lifting disk 221 is filled with activated carbon particles 99.

[0049] The rotating mechanism 3 also includes a motor 31, which is fixedly connected to the top of the filter barrel 21. The output shaft of the motor 31 extends downward through the filter barrel 21 and is fixedly connected to the turntable 32. A connecting rod 33 is fixedly connected to the lower end face of the turntable 32. The motor 31 drives the rotating disk 222 and the lifting disk 221 to rotate in a timely manner. When ventilation is performed, the activated carbon particles 99 at the ventilation opening 14 have a reduced ability to adsorb methane after long-term use, while the activated carbon particles 99 that are far from the ventilation opening 14 have a strong ability to adsorb methane. Therefore, after the motor 31 starts, it drives the lifting disk 221, the rotating disk 222 and the filled activated carbon particles 99 to deflect as a whole, so that the activated carbon particles 99 that were previously far from the ventilation opening 14 and had a strong ability to adsorb methane are brought closer to the ventilation opening 14, thereby improving the methane adsorption effect and avoiding the waste of activated carbon particles 99.

[0050] The connecting rod 33 is also equipped with an adjustment mechanism 4, which includes a connecting sleeve 41. The lower end of the connecting sleeve 41 is fixedly connected to the lifting plate 221, and the upper end of the connecting sleeve 41 is fixedly connected to a hanging spring 42. The upper end of the hanging spring 42 is fixedly connected to the lower end face of the turntable 32. A hanging sleeve 43 is slidably sleeved above the connecting sleeve 41, and the upper end of the hanging sleeve 43 is fixedly connected to the lower end face of the turntable 32. The hanging spring 42, the hanging sleeve 43, and the connecting sleeve 41 are all nested and slidably connected to the outside of the connecting rod 33. Figure 7As shown, the lifting disc 221 is connected to the lower end of the upper rotating disc 222 via a connecting sleeve 41, a hanging spring 42, and a hanging sleeve 43 (the uppermost lifting disc 221 is connected to the lower end of the rotating disc 32). The lifting disc 221 is filled with activated carbon particles 99. During use, the activated carbon particles 99 will break, thus losing their ability to adsorb methane. At the same time, the small activated carbon particles 99 will slide down through the V-shaped structure of the lifting disc 221, eventually falling from the sieve holes 223 into the discharge hole 224, and finally falling layer by layer to the bottom of the filter bucket 21. The user can open the bottom door for cleaning. The above-mentioned removal of small activated carbon particles 99 allows the lifting disc 221 to retain activated carbon particles 99 with strong adsorption capacity, thereby improving the methane filtration effect. It is also important to note that because the number of activated carbon particles 99 on the lifting plate 221 is reduced, the plate is not fully filled (the area formed by the upper rotating plate 222 and the lower lifting plate 221 in the filter tank 21 is within a V-shape). This allows methane-laden air to flow directly through the gaps in the surface of the activated carbon particles 99, resulting in unfiltered air being discharged outdoors. Therefore, the lifting plate 221 is installed via connecting sleeve 41, mounting spring 42, and mounting sleeve 43. This reduces the weight of the activated carbon particles 99 on the lifting plate 221, causing the mounting spring 42 to contract and move the lifting plate 221 upwards towards the upper rotating plate 222. This compresses the gaps in the surface of the activated carbon particles 99, preventing methane-laden air from being directly discharged through these gaps.

[0051] A folding curtain 44 is fixedly connected to the outer edge of the lower end face of the lifting plate 221. The lower end of the folding curtain 44 is fixedly connected to the upper end face of the rotating plate 222. The folding curtain 44 can be stretched and folded. When the mounting spring 42 contracts and drives the lifting plate 221 to move upward and close to the upper rotating plate 222, the lifting plate 221 will pull the folding curtain 44, so that the folding curtain 44 blocks the gap formed between the rotating plate 222 and the lifting plate 221, preventing air containing methane from flowing out directly from the gap.

[0052] In this embodiment, after the motor 31 starts, it causes the lifting plate 221, the rotating plate 222, and the filled activated carbon particles 99 to deflect as a whole. This brings the activated carbon particles 99, which were previously far from the vent 14 and have a strong ability to adsorb methane, closer to the vent 14, thus improving the methane adsorption effect and preventing the waste of activated carbon particles 99. During use, the activated carbon particles 99 will break and then slide down through the V-shaped structure of the lifting plate 221, eventually falling layer by layer to the bottom of the filter bucket 21, which the user can open for cleaning. The removal of small activated carbon particles 99 leaves only activated carbon particles 99 with strong adsorption capacity in the lifting plate 221, thereby improving the methane filtration effect. At the same time, because the number of activated carbon particles 99 on the lifting plate 221 is reduced, the weight of the activated carbon particles 99 above the lifting plate 221 is reduced, and the mounting spring 42 will contract, causing the lifting plate 221 to move upward and closer to the rotating plate 222 above, thereby compressing the gaps on the surface of the activated carbon particles 99 and preventing air containing methane from being directly discharged through these gaps. When the mounting spring 42 contracts, it causes the lifting plate 221 to move upward and approach the rotating plate 222 above. The lifting plate 221 will pull the folding curtain 44, so that the folding curtain 44 blocks the gap formed between the rotating plate 222 and the lifting plate 221, preventing air containing methane from flowing out directly from the gap.

[0053] The workflow is as follows:

[0054] When ventilation is required, the exhaust fan 16 starts and generates suction, drawing indoor air through the vent 14 and air inlet screen 23 into the filter canister 21. The indoor air is then filtered by the activated carbon particles 99 in the adsorption structure 22, where methane is absorbed. The motor 31 then starts, causing the lifting plate 221, rotating plate 222, and the filled activated carbon particles 99 to deflect. This brings the activated carbon particles 99, which were previously farther from the vent 14 and have stronger methane adsorption capabilities, closer to the vent 14, improving the methane adsorption effect and preventing waste. During use, the activated carbon particles 99 may break and slide down the V-shaped structure of the lifting plate 221, eventually reaching the bottom of the filter canister 21. Users can clean this by opening the bottom section. Removing the smaller activated carbon particles 99 leaves only the more potent ones within the lifting plate 221, further enhancing the methane filtration effect. Simultaneously, as the number of activated carbon particles 99 on the lifting plate 221 decreases, the weight of the activated carbon particles 99 above the lifting plate 221 is reduced. The mounting spring 42 contracts, causing the lifting plate 221 to move upwards towards the upper rotating plate 222, thereby compressing the gaps on the surface of the activated carbon particles 99 and preventing methane-laden air from directly escaping through these gaps. When the mounting spring 42 contracts, causing the lifting plate 221 to move upwards towards the upper rotating plate 222, the lifting plate 221 pulls the folding curtain 44, sealing the gap between the rotating plate 222 and the lifting plate 221, preventing methane-laden air from directly flowing out of this gap.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-noise automated ventilation and purification device for a hazardous gas chemical laboratory, comprising a ventilation mechanism (1), wherein the ventilation mechanism (1) includes a mounting plate (11), characterized in that, An outer cover (13) is fixedly connected to one side of the mounting plate (11), and a filter cleaning mechanism (2) is fixedly connected inside the outer cover (13). The filter cleaning mechanism (2) is connected to the mounting plate (11) through a vent (14). The vent (14) is set on the mounting plate (11), and a rotating mechanism (3) is provided above the filter cleaning mechanism (2). Among them, the filtration and cleaning mechanism (2) includes a filter barrel (21), which is fixedly connected to the inside of the outer cover (13). The filter barrel (21) is provided with multiple adsorption structures (22), which are equidistantly arranged from top to bottom inside the filter barrel (21). The side of the filter barrel (21) near the mounting plate (11) is provided with an air inlet screen (23) for the entry of air inside the laboratory, and the side of the filter barrel (21) away from the mounting plate (11) is provided with an air outlet screen (24) for the exhaust of air inside the laboratory. The vent (14) and the air inlet screen (23) are connected. The adsorption structure (22) includes a rotating disk (222), which is rotatably connected inside the filter barrel (21). The outer edge of the rotating disk (222) extends into the inner wall of the filter barrel (21). A lifting disk (221) is provided above the rotating disk (222). The outer edge of the lifting disk (221) and the inner wall of the filter barrel (21) slide against each other. The lifting disk (221) and the rotating disk (222) abut against each other. A sieve hole (223) is provided at the center of the lifting disk (221). A discharge hole (224) is provided at the center of the rotating disk (222). The sieve hole (223) and the discharge hole (224) are connected. The rotating mechanism (3) includes a connecting rod (33), which connects multiple rotating disks (222) in series from top to bottom, and the connecting rod (33) is slidably connected to multiple lifting disks (221) from top to bottom; The rotating mechanism (3) also includes a motor (31), which is fixedly connected to the top of the filter barrel (21). The output shaft of the motor (31) extends downward through the filter barrel (21) and is fixedly connected to the turntable (32). A connecting rod (33) is fixedly connected to the lower end face of the turntable (32). The connecting rod (33) is also provided with an adjustment mechanism (4). The adjustment mechanism (4) includes a connecting sleeve (41). The lower end of the connecting sleeve (41) is fixedly connected to the lifting plate (221). The upper end of the connecting sleeve (41) is fixedly connected to a hanging spring (42). The upper part of the connecting sleeve (41) is slidably fitted with a hanging sleeve (43). The lifting plate (221) is connected to the lower end of the upper rotating plate (222) through the connecting sleeve (41), the hanging spring (42), and the hanging sleeve (43). The uppermost lifting plate (221) is connected to the lower end of the rotating plate (32). The upper end of the uppermost hanging spring (42) is fixedly connected to the lower end face of the rotating plate (32). The upper end of the uppermost hanging sleeve (43) is fixedly connected to the lower end face of the rotating plate (32). The hanging spring (42), the hanging sleeve (43), and the connecting sleeve (41) are all nested and slidably connected to the outside of the connecting rod (33). A folding curtain (44) is fixedly connected to the outer edge of the lower end face of the lifting plate (221). The lower end of the folding curtain (44) is fixedly connected to the upper end face of the rotating plate (222). The folding curtain (44) can be stretched and folded. The lifting plate (221) is filled with activated carbon particles (99) for absorbing methane gas. Both the lifting plate (221) and the rotating plate (222) are set to a V-shaped structure. In the filter bucket (21), the area formed by the upper rotating plate (222) and the lower lifting plate (221) is V-shaped and filled with activated carbon particles (99).

2. The low-noise automated ventilation and purification device for hazardous gas chemical laboratories as described in claim 1, characterized in that, The mounting plate (11) has mounting bolts (12) at the four corners for easy installation of the entire device on the wall.

3. The low-noise automated ventilation and purification device for hazardous gas chemical laboratories as described in claim 2, characterized in that, The outer cover (13) is provided with an exhaust duct (15) at the end away from the mounting plate (11). The exhaust duct (15) and the interior of the outer cover (13) are connected. An exhaust fan (16) is provided inside the exhaust duct (15).

4. The low-noise automated ventilation and purification device for hazardous gas chemical laboratories as described in claim 1, characterized in that, The filter barrel (21) has a side door (25) for replacing activated carbon particles (99) on one side.

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