Low-noise automatic ventilation and purification device for harmful gas chemical laboratory

Abstract

The invention relates to the technical field of laboratory gas treatment equipment, in particular to a low-noise automatic ventilation and purification device for a harmful gas chemical laboratory, which comprises a ventilation mechanism, the ventilation mechanism comprises a mounting plate, one side of the mounting plate is fixedly connected with an outer cover, and the outer cover is internally and fixedly connected with a filtering and cleaning mechanism; the filtering and cleaning mechanism communicates with the mounting plate through a ventilation opening, the ventilation opening is formed in the mounting plate, and a rotating mechanism is arranged above the filtering and cleaning mechanism. According to the invention, after the activated carbon particles at the ventilation opening are used for a long time, the methane adsorption capacity is reduced, so that the motor is started to drive the lifting disc activated carbon particles, the rotating disc activated carbon particles and the filled activated carbon particles to integrally deflect, so that the activated carbon particles which are far away from the ventilation opening and have relatively strong methane adsorption capacity are close to the ventilation opening; the methane adsorption effect is improved, and meanwhile waste of activated carbon particles is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of laboratory gas treatment equipment, and specifically relates to a low-noise automatic ventilation and purification device for harmful gas chemical laboratories. Background Art

[0002] A laboratory automatic ventilation and cleaning device is a device used in a laboratory environment, aiming to control ventilation and cleaning to ensure that parameters such as air quality, temperature, and humidity in the laboratory are maintained within a safe range. This device is usually used in laboratories such as chemistry, biology, and medicine to protect the safety of experimental personnel and the accuracy of experimental results.

[0003] Publication No. CN117463110A discloses an activated carbon air purification device. This device pushes the activated carbon in the filter ring towards the fixed block through two push blocks, so that the activated carbon accumulates on both sides of the fixed block, that is, in the fan-shaped area formed by the two push blocks. When a large amount of flue gas is sucked, it will pass through the fan-shaped area formed by the two push blocks where a large amount of activated carbon is accumulated. A large amount of activated carbon can thoroughly purify the flue gas. However, in the actual use process, the activated carbon can be replaced multiple times. When replacing, it is often found that some of the activated carbon has not been fully used because it has not been in full contact with the harmful gas. This leads to waste of activated carbon during replacement. This is mainly because the activated carbon near the air inlet has a greater chance of contacting the harmful gas, resulting in the activated carbon at the head of the filter box losing the ability to absorb harmful gas faster, while the activated carbon at the tail has not been fully used. But at this time, the user will directly replace the filter box, which leads to insufficient utilization of the activated carbon.

[0004] In view of this, the present invention proposes a low-noise automatic ventilation and purification device for harmful gas chemical laboratories, which solves the above technical problems. Summary of the Invention

[0005] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. In this part, as well as in the abstract and title of the present application, some simplifications or omissions may be made to avoid obscuring the purpose of this part, the abstract, and the title of the invention. However, such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] A low-noise automatic ventilation and purification device for harmful gas chemical laboratories includes a ventilation mechanism. The ventilation mechanism includes a mounting plate. One side of the mounting plate is fixedly connected with an outer cover. An air filter and cleaning mechanism is fixedly connected inside the outer cover. The air filter and cleaning mechanism is communicated with the mounting plate through a ventilation port. The ventilation port is arranged on the mounting plate. A rotating mechanism is arranged above the air filter and cleaning mechanism;

[0007] Among them, the filtering and cleaning mechanism includes a filtering barrel, which is fixedly connected to the inside of the outer cover. A plurality of adsorption structures are arranged in the filtering barrel, and the adsorption structures are arranged at equal intervals from top to bottom in the filtering barrel. An air inlet grid for the air inside the laboratory to enter is arranged on one side of the filtering barrel close to the mounting plate, and an air outlet grid for the air inside the laboratory to be discharged is arranged on the side of the filtering barrel away from the mounting plate. The ventilation opening and the air inlet grid are in through connection;

[0008] The adsorption structure includes a rotating disk, which is rotatably connected to the inside of the filtering barrel. The outer edge of the rotating disk extends into the inner wall of the filtering barrel. An elevating disk is arranged above the rotating disk. The outer edge of the elevating disk is in sliding fit with the inner wall of the filtering barrel. The elevating disk and the rotating disk are in contact with each other. A sieve hole is arranged at the center of the elevating disk, and a blanking hole is arranged at the center of the rotating disk. The sieve hole and the blanking hole are in through connection.

[0009] As a preferred solution of the low-noise automatic ventilation and purification device for a harmful gas chemical laboratory provided by the present invention, mounting bolts for installation are arranged at the four corners of the mounting plate, which is convenient for installing the entire device on the wall.

[0010] As a preferred solution of the low-noise automatic ventilation and purification device for a harmful gas chemical laboratory provided by the present invention, an exhaust duct is arranged at one end of the outer cover away from the mounting plate. The exhaust duct is communicated with the inside of the outer cover, and an exhaust fan is arranged in the exhaust duct.

[0011] As a preferred solution of the low-noise automatic ventilation and purification device for a harmful gas chemical laboratory provided by the present invention, the rotating mechanism includes a connecting rod, which fixedly connects and strings a plurality of rotating disks from top to bottom. The connecting rod is slidably connected to a plurality of elevating disks from top to bottom.

[0012] As a preferred solution of the low-noise automatic ventilation and purification device for a harmful gas chemical laboratory provided by the present invention, the rotating mechanism further includes a motor, which is fixedly connected to the top end of the filtering barrel. The output shaft of the motor extends downward through the filtering barrel and is fixedly connected to the rotating disk. A connecting rod is fixedly connected to the lower end surface of the rotating disk.

[0013] As a preferred solution of the low-noise automatic ventilation and purification device for a harmful gas chemical laboratory provided by the present invention, an adjusting mechanism is further arranged on the connecting rod. The adjusting mechanism includes a connecting sleeve, the lower end of the connecting sleeve is fixedly connected to the elevating disk, the upper end of the connecting sleeve is fixedly connected to a mounting spring, the upper end of the mounting spring is fixedly connected to the lower end surface of the rotating disk, a mounting sleeve is slidably sleeved above the connecting sleeve, the upper end of the mounting sleeve is fixedly connected to the lower end surface of the rotating disk, and the mounting spring, the mounting 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 automatic ventilation and purification device for harmful gas chemical laboratories provided by the present invention, a folding curtain is fixedly connected to the outer edge of the lower end surface of the lifting disc. The lower end of the folding curtain is fixedly connected to the upper end surface of the rotating disc, and the folding curtain can be stretched and folded.

[0015] As a preferred embodiment of the low-noise automatic ventilation and purification device for harmful gas chemical laboratories provided by the present invention, activated carbon particles for absorbing methane gas are filled on the lifting disc.

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

[0017] As a preferred embodiment of the low-noise automatic ventilation and purification device for harmful gas chemical laboratories provided by the present invention, both the lifting disc and the rotating disc are arranged in a V-shaped structure. In the filter barrel, the area formed by the upper rotating disc and the lower lifting disc is V-shaped, and this area is filled with activated carbon particles.

[0018] Advantages of the present invention:

[0019] In the present invention, after the activated carbon particles at the ventilation opening are used for a long time, their ability to adsorb methane decreases, while the activated carbon particles far from the ventilation opening have a strong ability to adsorb methane. Therefore, after the motor is started, it drives the overall deflection of the activated carbon particles on the lifting disc, the activated carbon particles on the rotating disc, and the filled activated carbon particles, so that the activated carbon particles with strong methane adsorption ability that were far from the ventilation opening before are close to the ventilation opening, improving the methane adsorption effect and also avoiding waste of the activated carbon particles. At the same time, during use, the activated carbon particles will break and finally fall layer by layer to the bottom of the filter barrel. Removing the small and broken activated carbon particles can leave the activated carbon particles with strong adsorption ability in the activated carbon particles on the lifting disc, thereby improving the methane filtration effect. At the same time, because the amount of activated carbon particles on the activated carbon particles on the lifting disc decreases, the weight of the activated carbon particles above the activated carbon particles on the lifting disc is reduced, and the hanging spring will contract to drive the activated carbon particles on the lifting disc to move upward close to the activated carbon particles on the upper rotating disc, thereby compressing the gaps on the surface of the activated carbon particles and preventing the air with methane from directly discharging from these gaps. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Among them:

[0022] Figure 1 Schematic diagram of the overall structure of a low-noise automatic ventilation and purification device for a harmful gas chemistry laboratory;

[0023] Figure 2 Schematic diagram of the connection structure of the ventilation mechanism in a low-noise automatic ventilation and purification device for a harmful gas chemistry laboratory;

[0024] Figure 3 Schematic diagram of the internal connection structure of the filter barrel in a low-noise automatic ventilation and purification device for a harmful gas chemistry laboratory;

[0025] Figure 4 It is Figure 3 Enlarged schematic diagram of the structure at A in

[0026] Figure 5 Schematic diagram of the connection structure of the filter cleaning mechanism and the rotating mechanism in a low-noise automatic ventilation and purification device for a harmful gas chemistry laboratory;

[0027] Figure 6 Schematic diagram of the connection structure of the adjustment mechanism in a low-noise automatic ventilation and purification device for a harmful gas chemistry laboratory;

[0028] Figure 7 It is Figure 6 Enlarged schematic diagram of the structure at B in

[0029] Figure 8 Schematic diagram of the connection structure of the adsorption structure, the folding curtain and the activated carbon particles in a low-noise automatic ventilation and purification device for a harmful gas chemistry laboratory;

[0030] In the figure:

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

[0032] 2. Filter cleaning mechanism; 21. Filter barrel; 22. Adsorption structure; 221. Lifting plate; 222. Rotating plate; 223. Sieve holes; 224. Feeding holes; 23. Inlet air partition net; 24. Outlet air partition net; 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 particles. Detailed implementation method

[0036] To make the object, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] Embodiment

[0038] As Figure 1 、 Figure 3 、 Figure 5 、 Figure 6 and Figure 8 shown, a low-noise automatic ventilation and purification device for a harmful gas chemistry laboratory includes a ventilation mechanism 1. The ventilation mechanism 1 includes a mounting plate 11. One side of the mounting plate 11 is fixedly connected with an outer cover 13. A filter cleaning mechanism 2 is fixedly connected inside the outer cover 13. The filter cleaning mechanism 2 is communicated with the mounting plate 11 through a ventilation port 14. The ventilation port 14 is arranged on the mounting plate 11. A rotating mechanism 3 is arranged above the filter cleaning mechanism 2;

[0039] Among them, the filter cleaning mechanism 2 includes a filter barrel 21. The filter barrel 21 is fixedly connected inside the outer cover 13. A plurality of adsorption structures 22 are arranged in the filter barrel 21. The adsorption structures 22 are equidistantly arranged from top to bottom in the filter barrel 21. One side of the filter barrel 21 close to the mounting plate 11 is provided with an air inlet partition net 23 for the air inside the laboratory to enter. One side of the filter barrel 21 far from the mounting plate 11 is provided with an air outlet partition net 24 for the air inside the laboratory to be discharged. The ventilation port 14 is communicated with the air inlet partition net 23;

[0040] The adsorption structure 22 includes a rotating disk 222. The rotating disk 222 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. An elevating disk 221 is arranged above the rotating disk 222. The outer edge of the elevating disk 221 is slidably attached to the inner wall of the filter barrel 21. The elevating disk 221 and the rotating disk 222 are in contact with each other. A sieve hole 223 is arranged at the center of the elevating disk 221. A blanking hole 224 is arranged at the center of the rotating disk 222. The sieve hole 223 and the blanking hole 224 are communicated;

[0041] Activated carbon particles 99 for absorbing methane gas are filled on the elevating disk 221; the activated carbon particles 99 can effectively remove methane in the air, reduce the content of methane in the discharged air, and prevent the discharge of harmful gases.

[0042] On one side of the filter barrel 21, there is a side door 25 for replacing the activated carbon particles 99. After the activated carbon particles 99 have been used for a long time, their ability to remove methane will decrease. The side door 25 can be opened in a timely manner to pour out the used activated carbon particles 99 and replace them with new ones.

[0043] Both the lifting plate 221 and the rotating plate 222 are set in a V-shaped structure. In the filter barrel 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. As Figure 8 shown, when filtering air, the air will enter the V-shaped activated carbon particle 99 area from the left and then discharge from the right. It should be noted that the density of methane is less than that of air. Therefore, after methane enters the V-shaped area, it will move upward in the V-shaped area. There is a rotating plate 222 blocking above the V-shaped area, so methane cannot escape from this area. Also, because the first half of the V-shaped area is an inclined channel, it can make the residence time of methane and air in this section of the channel longer, so that the activated carbon particles 99 can better absorb methane in the air. Subsequently, after air and methane pass through the middle part of the V-shaped area, because the second half of the V-shaped area is a reverse-inclined channel, it enables air to pass through this area faster, making the filtered gas pass through faster and improving the filtering efficiency.

[0044] In the embodiment, when ventilation is required, after the exhaust fan 16 is started, it generates suction. The indoor air enters the interior of the filter barrel 21 through the ventilation opening 14 and the air inlet grid 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. Subsequently, the filtered air enters the exhaust duct 15 through the air outlet grid 24 and is finally discharged outdoors.

[0045] As Figure 1 、 Figure 2 and Figure 3 shown, at the four corners of the mounting plate 11, there are mounting bolts 12 for installation, which facilitates the installation of the entire device on the wall;

[0046] At one end of the outer cover 13 away from the mounting plate 11, there is an exhaust duct 15. The exhaust duct 15 is internally connected to the inside of the outer cover 13, and an exhaust fan 16 is provided in the exhaust duct 15.

[0047] In the embodiment, the side of the mounting plate 11 away from the outer cover 13 is installed indoors, and then fixed using the mounting bolts 12. When ventilation is required, the exhaust fan 16 is turned on. After the exhaust fan 16 is started, the indoor gas is sucked into the exhaust duct 15, and then the indoor gas is discharged. The indoor gas sequentially passes through the ventilation opening 14, the outer cover 13, and the exhaust duct 15.

[0048] As Figure 3 、Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown in Figure 8 , the rotating mechanism 3 includes a connecting rod 33. The connecting rod 33 fixedly connects and strings together a plurality of rotating disks 222 from top to bottom. The connecting rod 33 is slidably connected to a plurality of lifting disks 221 from top to bottom. The rotating disks 222 are fixedly connected and strung together as a whole by the connecting rod 33 and are driven to rotate by a motor 31. The lifting disks 221 are individual integral bodies that can move up and down along the connecting rod 33. The lifting disks 221 also rotate with the rotating disks 222. Activated carbon particles 99 are filled on the lifting disks 221.

[0049] The rotating mechanism 3 further includes a motor 31. The motor 31 is fixedly connected to the top end of the filter barrel 21. The output shaft of the motor 31 extends downward through the filter barrel 21 and is fixedly connected to a rotating disk 32. A connecting rod 33 is fixedly connected to the lower end surface of the rotating disk 32. The motor 31 drives the rotating disks 222 and the lifting disks 221 to rotate in a timely manner. When ventilation is carried out, after the activated carbon particles 99 at the ventilation port 14 have been used for a long time, their ability to adsorb methane decreases, while the activated carbon particles 99 far from the ventilation port 14 have a strong ability to adsorb methane. Therefore, after the motor 31 is started, it drives the lifting disks 221, the rotating disks 222, and the filled activated carbon particles 99 as a whole to deflect, so that the activated carbon particles 99 with strong methane adsorption ability that were far from the ventilation port 14 before approach the ventilation port 14, improving the methane adsorption effect and also avoiding waste of the activated carbon particles 99.

[0050] An adjustment mechanism 4 is further provided on the connecting rod 33. The adjustment mechanism 4 includes a connecting sleeve 41. The lower end of the connecting sleeve 41 is fixedly connected to the lifting disk 221. The upper end of the connecting sleeve 41 is fixedly connected to a mounting spring 42. The upper end of the mounting spring 42 is fixedly connected to the lower end surface of the rotating disk 32. A mounting sleeve 43 is slidably sleeved above the connecting sleeve 41. The upper end of the mounting sleeve 43 is fixedly connected to the lower end surface of the rotating disk 32. The mounting spring 42, the mounting sleeve 43, and the connecting sleeve 41 are all nested and slidably connected to the outside of the connecting rod 33. As Figure 7As shown in the figure, the lifting disc 221 is connected to the lower end of the previous rotating disc 222 (the uppermost lifting disc 221 is connected to the lower end of the rotating disc 32) through the connecting sleeve 41, the hanging spring 42, and the hanging sleeve 43. The lifting disc 221 is filled with activated carbon particles 99. Since the activated carbon particles 99 will break during use, the function of adsorbing methane will be lost. At the same time, the small broken activated carbon particles 99 will slide down through the V-shaped structure of the lifting disc 221 and finally fall into the feeding hole 224 from the sieve hole 223, and finally layer by layer to the bottom of the filter barrel 21. The user can open and clean it from the bottom door. Removing the small broken activated carbon particles 99 as described above can leave the activated carbon particles 99 with strong adsorption capacity in the lifting disc 221, thereby improving the filtering effect of methane. At the same time, it should be noted that because the activated carbon particles 99 on the lifting disc 221 are reduced, the activated carbon particles 99 on the lifting disc 221 are not in a full state (in the filter barrel 21, the area formed by the upper rotating disc 222 and the lower lifting disc 221 is within the V shape), so that the air with methane flows directly through the gaps on the surface of the activated carbon particles 99 and is discharged outdoors without being filtered. Therefore, the lifting disc 221 is installed through the connecting sleeve 41, the hanging spring 42, and the hanging sleeve 43. After the weight of the activated carbon particles 99 above the lifting disc 221 is reduced, the hanging spring 42 will contract and drive the lifting disc 221 to move upward close to the upper rotating disc 222, thereby compressing the gaps on the surface of the activated carbon particles 99 and preventing the air with methane from directly discharging from these gaps.

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

[0052] In an embodiment, after the motor 31 is started, it drives the overall deflection of the lifting disc 221, the rotating disc 222, and the filled activated carbon particles 99, so that the activated carbon particles 99 with strong methane adsorption, which were far from the ventilation opening 14 before, approach the ventilation opening 14, improving the methane adsorption effect and avoiding waste of the 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 disc 221, and finally layer by layer to the bottom of the filter barrel 21. The user can open and clean it from the bottom door. The removal of the small and broken activated carbon particles 99 can leave the activated carbon particles 99 with strong adsorption capacity in the lifting disc 221, thereby improving the methane filtration effect. At the same time, because the activated carbon particles 99 on the lifting disc 221 decrease, the weight of the activated carbon particles 99 above the lifting disc 221 is reduced, and the hanging spring 42 will contract to drive the lifting disc 221 to move upward and approach the upper rotating disc 222, thereby compressing the gaps on the surface of the activated carbon particles 99 and preventing the air with methane from directly discharging from these gaps. When the hanging spring 42 contracts to drive the lifting disc 221 to move upward and approach the upper rotating disc 222, the lifting disc 221 will pull the folding curtain 44, so that the folding curtain 44 seals the gap formed between the rotating disc 222 and the lifting disc 221, preventing the air with methane from directly flowing out of this gap.

[0053] The working process is as follows:

[0054] When ventilation is required, after the exhaust fan 16 is started, suction is generated. The indoor air enters the interior of the filter barrel 21 through the ventilation opening 14 and the air inlet grid 23. After being filtered by the activated carbon particles 99 in the adsorption structure 22, methane in the indoor air is absorbed by the activated carbon particles 99. After the motor 31 is started, it drives the lifting plate 221, the rotating plate 222 and the filled activated carbon particles 99 to deflect as a whole, so that the activated carbon particles 99, which were far from the ventilation opening 14 before and had strong methane adsorption ability, approach the ventilation opening 14, improving the methane adsorption effect and also avoiding waste of the 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 and finally layer by layer to the bottom of the filter barrel 21. The user can open and clean it from the bottom door. The removal of the small and broken activated carbon particles 99 can leave the activated carbon particles 99 with strong adsorption ability in the lifting plate 221, thus improving the methane filtration effect. At the same time, because the activated carbon particles 99 on the lifting plate 221 decrease, the weight of the activated carbon particles 99 above the lifting plate 221 is reduced, and the hanging spring 42 will contract to drive the lifting plate 221 to move upward close to the upper rotating plate 222, thereby compressing the gaps on the surface of the activated carbon particles 99 and preventing the air with methane from directly discharging through these gaps. When the hanging spring 42 contracts to drive the lifting plate 221 to move upward close to the upper rotating plate 222, the lifting plate 221 will pull the folding curtain 44, so that the folding curtain 44 seals the gap formed between the rotating plate 222 and the lifting plate 221, preventing the air with methane from directly flowing out through this gap.

[0055] The above shows and describes 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 by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope claimed by the present invention. The scope claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-noise automatic ventilation and purification device for a harmful gas chemical laboratory, comprising a ventilation mechanism (1), the ventilation mechanism (1) comprising a mounting plate (11), characterized in that: 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 vent (14), the vent (14) is arranged on the mounting plate (11), and a rotating mechanism (3) is arranged above the filter cleaning mechanism (2); The filtering and cleaning mechanism (2) comprises a filtering barrel (21), the filtering barrel (21) being fixedly connected to the interior of the outer cover (13), a plurality of adsorption structures (22) being arranged in the filtering barrel (21), the adsorption structures (22) being arranged equidistantly from top to bottom in the filtering barrel (21), an air inlet screen (23) for the air inside the laboratory to enter is arranged on the side of the filtering barrel (21) close to the mounting plate (11), an air outlet screen (24) for the air inside the laboratory to be discharged is arranged on the side of the filtering barrel (21) away from the mounting plate (11), and the vent (14) and the air inlet screen (23) are connected.

2. The low-noise automatic ventilation and purification device for harmful gas chemical laboratories as claimed in claim 1, characterized in that: The adsorption structure (22) comprises a rotating disk (222), the rotating disk (222) is rotatably connected in 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 arranged above the rotating disk (222), the outer edge of the lifting disk (221) and the inner wall of the filter barrel (21) are slidably fitted, the lifting disk (221) and the rotating disk (222) are in contact with each other, a sieve hole (223) is arranged at the center of the lifting disk (221), a material discharge hole (224) is arranged at the center of the rotating disk (222), the sieve hole (223) and the material discharge hole (224) are connected, and mounting bolts (12) for mounting are arranged at the four corners of the mounting plate (11), so as to facilitate the whole device to be mounted on the wall.

3. The low-noise automatic ventilation and purification device for harmful gas chemical laboratories as claimed in claim 2, characterized in that: An exhaust duct (15) is provided at one end of the outer cover (13) away from the mounting plate (11); the exhaust duct (15) is communicated with the interior of the outer cover (13); and an exhaust fan (16) is provided in the exhaust duct (15).

4. The low-noise automatic ventilation and purification device for harmful gas chemical laboratories as claimed in claim 3, characterized in that: The rotating mechanism (3) comprises a connecting rod (33), wherein the connecting rod (33) fixes and connects a plurality of rotating disks (222) in series from top to bottom, and the connecting rod (33) is slidably connected to a plurality of lifting disks (221) from top to bottom.

5. The low-noise automatic ventilation and purification device for harmful gas chemical laboratories as claimed in claim 4, characterized in that: The rotating mechanism (3) further comprises a motor (31), the motor (31) being fixedly connected to the top end of the filter barrel (21), the output shaft of the motor (31) extending downward through the filter barrel (21) and then fixedly connected to the rotating disk (32), the lower end surface of the rotating disk (32) being fixedly connected to a connecting rod (33).

6. The low-noise automatic ventilation and purification device for harmful gas chemical laboratories as claimed in claim 5, characterized in that: The connecting rod (33) is also provided with an adjustment mechanism (4), which comprises 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 mounting spring (42), the upper end of the mounting spring (42) is fixedly connected to the lower end surface of the rotating plate (32), a mounting sleeve (43) is slidably sleeved above the connecting sleeve (41), the upper end of the mounting sleeve (43) is fixedly connected to the lower end surface of the rotating plate (32), and the mounting spring (42), the mounting sleeve (43) and the connecting sleeve (41) are all nested and slidably connected to the outside of the connecting rod (33).

7. The low-noise automatic ventilation and purification device for harmful gas chemical laboratories as claimed in claim 6, characterized in that: A folding curtain (44) is fixedly connected to the outer edge of the lower end surface of the lifting plate (221), and the lower end of the folding curtain (44) is fixedly connected to the upper end surface of the rotating plate (222). The folding curtain (44) can be stretched and folded.

8. The low-noise automatic ventilation and purification device for harmful gas chemical laboratories as claimed in claim 7, characterized in that: The lifting plate (221) is filled with activated carbon particles (99) for absorbing methane gas.

9. The low-noise automatic ventilation and purification device for harmful gas chemical laboratories as claimed in claim 8, characterized in that: A side door (25) for replacing activated carbon particles (99) is provided on one side of the filter barrel (21).

10. The low-noise automatic ventilation and purification device for harmful gas chemical laboratories as claimed in claim 8, characterized in that: The lifting plate (221) and the rotating plate (222) are both configured as a V-shaped structure. In the filter barrel (21), the area formed by the upper rotating plate (222) and the lower lifting plate (221) is V-shaped, and the area is filled with activated carbon particles (99).

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