Laboratory air purification and sterilization device

Abstract

The invention relates to the technical field of air purification equipment, in particular to a laboratory air purification and sterilization device which comprises four first semicircular shells, every two adjacent first semicircular shells are fixedly connected, and one side of each first semicircular shell abuts against a second semicircular shell. According to the air purifier, the contact area of air and a purifying agent can be increased through the arrangement of the vortex plate, the air purifying agent rapidly absorbs poisonous gas in the air, meanwhile, harmful peculiar smell in the air can be eliminated, the air can enter the position above the baffle disc from the bottom of the baffle disc through the ventilation opening formed in the baffle disc, a purifying path is increased after the air is baffled, and the purifying effect is improved. After the semicircular shell I and the semicircular shell II are separated, not only can the inner walls of the semicircular shell I and the semicircular shell II be conveniently cleaned, but also a purifying agent capable of purifying harmful gases can be added according to various harmful gases generated in the laboratory, so that the device can eliminate the various harmful gases in the laboratory; therefore, the purification effect of the device on laboratory air is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air purification equipment, and specifically to a laboratory air purification and sterilization device. Background Art

[0002] It is well known that various gases are generated in chemical experiments. Some of these gases are irritating gases, and some are toxic. For the health of experimental personnel and environmental protection, experiments are usually carried out in a fume hood. However, the fume hood cannot be moved, which brings limitations and many inconveniences to the experiment. An air purifier, also known as an "air cleaner", air freshener, or purifier, refers to a product that can adsorb, decompose, or convert various air pollutants (generally including PM2.5, dust, pollen, odor, decoration pollution such as formaldehyde, bacteria, allergens, etc.), and effectively improve the air cleanliness. It is mainly divided into household, commercial, industrial, and building types.

[0003] Acidic, alkaline, VOC and other gases are generated in the laboratory. The existing laboratory air purification devices will generate a variety of gases during the experiment. At present, the laboratory purification devices cannot purify the bacteria, formaldehyde, and odor doped in the air at one time, and often need to be purified multiple times to purify most of them, which seriously affects the air purification efficiency. Moreover, it is difficult to purify a variety of polluting gases. Some toxic gases need to be eliminated with specific chemical purifying agents, and it is inconvenient to add the required chemical purifying agents in the current purification and sterilization devices. Summary of the Invention

[0004] The purpose of the present invention is to provide a laboratory air purification and sterilization device to solve the problems mentioned in the above background art, that is, acidic, alkaline, VOC and other gases are generated in the laboratory. The existing laboratory air purification devices will generate a variety of gases during the experiment. At present, the laboratory purification devices cannot purify the bacteria, formaldehyde, and odor doped in the air at one time, and often need to be purified multiple times to purify most of them, which seriously affects the air purification efficiency. Moreover, it is difficult to purify a variety of polluting gases. Some toxic gases need to be eliminated with specific chemical purifying agents, and it is inconvenient to add the required chemical purifying agents in the current purification and sterilization devices.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A laboratory air purification and sterilization device, comprising four semi-cylindrical shells I. Adjacent two of the semi-cylindrical shells I are fixedly connected. One side of each of the four semi-cylindrical shells I abuts against a semi-cylindrical shell II. Adjacent two of the semi-cylindrical shells II are fixedly connected. Two limiting slide rails are fixedly connected to the inner wall of the semi-cylindrical shell II. A fixing ring is slidably connected between the two limiting slide rails. A baffle plate is fixedly connected in the fixing ring. An air vent is opened on the baffle plate. One end of an air inlet pipe is fixedly connected to the outer wall of the semi-cylindrical shell I at the bottom end. The air inlet pipe is communicated with the inside of the semi-cylindrical shell I. The other end of the air inlet pipe is fixedly connected to a cylinder body. The output end of an air extraction pump communicated with the inside of the cylinder body is fixedly arranged at the end of the cylinder body. A positioning seat is fixedly sleeved on the outer wall of the air extraction pump. The bottom end of the positioning seat is fixedly connected to a base plate. An exhaust pipe is fixedly connected to the top of the semi-cylindrical shell I at the top end.

[0006] Furthermore, three purification barrels are equidistantly arranged on one side of the semi-cylindrical shell I. A support column II is fixedly connected to the bottom of the purification barrel at the bottom end. An L-shaped pipe is fixedly connected in each of the three purification barrels. The end of the L-shaped pipe is fixedly connected to the outer wall of the semi-cylindrical shell I. A one-way valve I is fixedly arranged in the L-shaped pipe. A three-way cylinder communicated with the inside of the purification barrel is fixedly connected to the center position of the top of the purification barrel. One end of a connecting pipe is fixedly connected to the outer wall of the three-way cylinder. The other end of the connecting pipe is fixedly connected to the outer wall of the semi-cylindrical shell I. A one-way valve II is fixedly arranged in the connecting pipe.

[0007] Furthermore, one end of a liquid inlet pipe is fixedly connected to the outer wall of the three-way cylinder. The other end of the liquid inlet pipe is fixedly connected to an adding tank. An electromagnetic valve I is fixedly arranged on the outer wall of the liquid inlet pipe. A drain column communicated with the inside of the purification barrel is fixedly connected to the bottom of the purification barrel. A replenishing head is fixedly connected to the top of the adding tank.

[0008] Furthermore, an air purification liquid is arranged inside the purification barrel. The liquid level height of the air purification liquid is at the middle position of the purification barrel.

[0009] Furthermore, vortex plates are fixedly connected to both the top and the bottom of the baffle plate. An air purification agent is arranged on the inner wall of the vortex plate.

[0010] Furthermore, ultraviolet lamp tubes are fixedly arranged on both the inner top wall and the inner bottom wall of the semi-cylindrical shell II.

[0011] Furthermore, an activated carbon layer is fixedly arranged inside the cylinder body.

[0012] Furthermore, two sealing grooves are symmetrically opened on the inner wall of the semi-cylindrical shell I. Two sealing strips are symmetrically fixedly connected to the inner wall of the semi-cylindrical shell II. The sealing strips are embedded and connected with the sealing grooves.

[0013] Furthermore, a connecting plate is fixedly connected between the outer walls of the two semi-cylindrical shells located at both ends. At the central position of the side wall of the connecting plate, a helical tooth column is fixedly connected. A limiting sleeve is slidably sleeved outside the helical tooth column. A limiting block slidably connected to the helical tooth column is fixedly connected in the limiting sleeve. Two pressing springs fixedly connected to the connecting plate are symmetrically and fixedly connected to the limiting sleeve. A pulling handle is fixedly connected to the end of the helical tooth column. A first support column is fixedly connected to the bottom end of the limiting sleeve.

[0014] Furthermore, a stop block is slidably connected in the limiting sleeve. The stop block is engaged with the helical tooth column. A return spring is fixedly connected to the inner wall of the stop block.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The air in the laboratory can be pumped into the cylinder by the air pump. The activated carbon layer in the cylinder can preliminarily filter the pumped air, so as to facilitate the interception of impurity particles and the like in the laboratory air. The processed air is discharged into the space enclosed by the first semi-cylindrical shell and the second semi-cylindrical shell through the air inlet pipe. Since the enclosed space is separated by the baffle plate, the air will contact the air purifying agent on the vortex plate. The setting of the vortex plate can increase the contact area between the air and the purifying agent. The air purifying agent can quickly absorb the toxic gas in the air and simultaneously eliminate the harmful odor in the air. The air can enter from the bottom of the baffle plate to the upper part of the baffle plate through the ventilation openings provided on the baffle plate. After the air passes through the baffle plate, the purification path is increased. By separating the first semi-cylindrical shell and the second semi-cylindrical shell, it is not only convenient to clean the inner walls of the first semi-cylindrical shell and the second semi-cylindrical shell, but also the purifying agent capable of purifying harmful gases can be added according to various harmful gases generated in the laboratory, so that the device can eliminate various harmful gases in the laboratory, thereby improving the purification effect of the device on the laboratory air.

[0016] 2. The air after adsorption enters the purification barrel through the L-shaped pipe on the outer wall of the first semi-cylindrical shell. The liquid level of the air purification liquid is higher than the bottom outlet of the L-shaped pipe. Therefore, the air discharged from the L-shaped pipe will be fully mixed with the air purification liquid. The purification liquid can decompose the harmful gases in the laboratory air, and the photocatalyst substance in the purification liquid can sterilize the air, so as to purify the air in a liquid state. The air after secondary purification will rise into the three-way cylinder and then be discharged into the circular space enclosed by the second first semi-cylindrical shell and the second semi-cylindrical shell through the connecting pipe for solid purification again. In this way, the air passes through baffle plate and adsorption and then enters the purification barrel for liquid purification. Therefore, the pumped laboratory air can eliminate most of the harmful gases in the air at one time after multiple alternating purification treatments between solid state and liquid state, improving the purification efficiency of the laboratory air and providing an environmentally friendly air environment for the laboratory.

[0017] 3. The ultraviolet lamp tubes arranged on the inner top wall and inner bottom wall of the semi-circular shell II can sterilize the air during the solid purification process. By providing a sealing groove on the inner wall of the semi-circular shell I, when the semi-circular shell II and the semi-circular shell I are combined, the sealing strip will be embedded in the sealing groove, thereby enhancing the sealing performance between the two and preventing air leakage during the purification process.

[0018] 4. By pulling the handle, the helical column can be pulled to slide in the limit sleeve. During the sliding process, the block in the limit sleeve is kept engaged and clamped with the helical column under the pull of the return spring, thereby limiting the helical column. By pulling, the connecting plate can separate the semi-circular shell II and the semi-circular shell I, facilitating manual rotation of the baffle plate in the semi-circular shell II and adding a purification agent to the vortex plate, so as to keep the device in good purification effect. Description of the Drawings

[0019] Figure 1 is the schematic diagram of the overall structure of the present invention; Figure 2 is the schematic diagram of the overall separated state structure of the present invention; Figure 3 is the schematic diagram of the semi-circular shell II structure of the present invention; Figure 4 is the schematic diagram of the baffle plate structure of the present invention; Figure 5 is the schematic diagram of the connecting plate structure of the present invention; Figure 6 is the schematic diagram of the air intake unit structure of the present invention; Figure 7 is the schematic diagram of the connection structure of the adding tank of the present invention; Figure 8 is the schematic diagram of the cross-sectional structure of the purification barrel of the present invention.

[0020] In the figure: 101, air extraction pump; 102, positioning seat; 103, cylinder body; 104, activated carbon layer; 105, intake pipe; 106, semi-circular shell I; 107, sealing groove; 108, exhaust pipe; 109, semi-circular shell II; 110, sealing strip; 111, limit slide rail; 112, ultraviolet lamp tube; 113, baffle plate; 114, fixing ring; 115, vortex plate; 116, vent hole; 117, connecting plate; 118, helical column; 119, limit sleeve; 120, limit block; 121, extrusion spring; 122, pulling handle; 123, support column I; 124, block; 125, return spring; 201, base plate; 202, support column II; 203, purification barrel; 204, L-shaped pipe; 205, check valve I; 206, three-way cylinder; 207, connecting pipe; 208, check valve II; 209, liquid inlet pipe; 210, adding tank; 211, replenishing head; 212, liquid discharge column. Detailed Embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments 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.

[0022] Please refer to Figures 1 to 8 In the embodiment of the present invention, a laboratory air purification and sterilization device includes four semi-cylindrical shells 106. Adjacent two semi-cylindrical shells 106 are fixedly connected. One side of each of the four semi-cylindrical shells 106 abuts against a semi-cylindrical shell 109. Adjacent two semi-cylindrical shells 109 are fixedly connected. Two limiting slide rails 111 are fixedly connected to the inner wall of the semi-cylindrical shell 109. A fixing ring 114 is slidably connected between the two limiting slide rails 111. A blocking disc 113 is fixedly connected in the fixing ring 114. An air vent 116 is formed in the blocking disc 113. One end of an air inlet pipe 105 is fixedly connected to the outer wall of the semi-cylindrical shell 106 at the bottom end. The air inlet pipe 105 is communicated with the inside of the semi-cylindrical shell 106. The other end of the air inlet pipe 105 is fixedly connected to a cylinder body 103. The end of the cylinder body 103 is fixedly provided with the output end of an air extraction pump 101 communicated with its inside. The outer wall of the air extraction pump 101 is fixedly sleeved with a positioning seat 102. The bottom end of the positioning seat 102 is fixedly connected to a base plate 201. An exhaust pipe 108 is fixedly connected to the top of the semi-cylindrical shell 106 at the top end; an activated carbon layer 104 is fixedly provided inside the cylinder body 103; vortex plates 115 are fixedly connected to both the top and the bottom of the blocking disc 113. An air purification agent is arranged on the inner wall of the vortex plate 115.

[0023] Specifically, the air pump 101 can pump the air in the laboratory into the cylinder 103. The activated carbon layer 104 in the cylinder 103 can preliminarily filter the pumped air, so as to facilitate the interception of impurity particles and the like in the laboratory air. The treated air is discharged into the space enclosed by the semi-cylindrical shell one 106 and the semi-cylindrical shell two 109 through the air inlet pipe 105. Since the enclosed space is separated by the baffle plate 113, the air will contact the air purifying agent on the vortex plate 115. The setting of the vortex plate 115 can increase the contact area between the air and the purifying agent. The air purifying agent can quickly absorb the toxic gases in the air and simultaneously eliminate the harmful odors in the air. The air can enter from the bottom of the baffle plate 113 to the upper part of the baffle plate 113 through the ventilation opening 116 opened on the baffle plate 113. After the air passes through the baffle, the purification path is increased. After separating the semi-cylindrical shell one 106 and the semi-cylindrical shell two 109, it is not only convenient to clean the inner walls of the semi-cylindrical shell one 106 and the semi-cylindrical shell two 109, but also the purifying agent capable of purifying harmful gases can be added according to various harmful gases generated in the laboratory, so that the device can eliminate various harmful gases in the laboratory, thereby improving the purification effect of the device on the laboratory air.

[0024] Embodiment 1 As Figure 8 shown, in this embodiment, three purification barrels 203 are equidistantly arranged on one side of the semi-cylindrical shell one 106. The support column two 202 is fixedly connected to the bottom of the purification barrel 203 at the bottom. The L-shaped pipes 204 are fixedly connected to all three purification barrels 203. The end of the L-shaped pipe 204 is fixedly connected to the outer wall of the semi-cylindrical shell one 106. The one-way valve one 205 is fixedly arranged in the L-shaped pipe 204. The three-way cylinder 206 communicated with the inside thereof is fixedly connected to the center position of the top of the purification barrel 203. One end of the communication pipe 207 is fixedly connected to the outer wall of the three-way cylinder 206. The other end of the communication pipe 207 is fixedly connected to the outer wall of the semi-cylindrical shell one 106. The one-way valve two 208 is fixedly arranged in the communication pipe 207. An air purification liquid is arranged inside the purification barrel 203, and the liquid level height of the air purification liquid is located at the middle position of the purification barrel 203.

[0025] In this embodiment, the air after adsorption enters the purification barrel 203 through the L-shaped pipe 204 on the outer wall of the semi-circular shell one 106. The liquid level of the air purification liquid is higher than the bottom outlet of the L-shaped pipe 204. Thus, the air discharged from the L-shaped pipe 204 will be fully mixed with the air purification liquid. The purification liquid can decompose harmful gases in the laboratory air, and the photocatalyst substance in the purification liquid can sterilize the air. Therefore, the air can be purified by liquid. The air after secondary purification will rise into the three-way cylinder 206, and then be discharged into the circular space enclosed by the second semi-circular shell one 106 and the semi-circular shell two 109 through the connecting pipe 207 for solid purification again. In this way, the air enters the purification barrel 203 for liquid purification after being deflected and adsorbed. Thus, most of the harmful gases in the extracted laboratory air can be eliminated at one time after multiple alternating purification treatments between solid state and liquid state, improving the purification efficiency of the laboratory air and providing an environmentally friendly air environment for the laboratory.

[0026] Embodiment Two As Figure 7 shown, in this embodiment, one end of a liquid inlet pipe 209 is fixedly connected to the outer wall of the three-way cylinder 206. The other end of the liquid inlet pipe 209 is fixedly connected to an adding tank 210. An electromagnetic valve one is fixedly arranged on the outer wall of the liquid inlet pipe 209. The bottom of the purification barrel 203 is fixedly connected to a drain column 212 communicating with its interior. The top of the adding tank 210 is fixedly connected to a replenishing head 211.

[0027] During specific implementation, after the purification liquid in the purification barrel 203 is used multiple times, the decomposition effect of the liquid decreases and it contains more impurities. Then, the waste liquid can be drained completely through the drain column 212. After that, by opening the electromagnetic valve one, the new air purification liquid in the adding tank 210 can be added to each purification barrel 203 through the liquid inlet pipe 209, enabling the device to be quickly put into use.

[0028] Embodiment Three As Figures 2 - 3 shown, in this embodiment, ultraviolet lamp tubes 112 are fixedly arranged on both the inner top wall and the inner bottom wall of the semi-circular shell two 109; two sealing grooves 107 are symmetrically formed on the inner wall of the semi-circular shell one 106, and two sealing strips 110 are symmetrically and fixedly connected to the inner wall of the semi-circular shell two 109. The sealing strips 110 are embedded and connected with the sealing grooves 107.

[0029] During specific implementation, the ultraviolet lamp tubes 112 provided on the inner top wall and inner bottom wall of the semi-circular shell two 109 can sterilize the air during the solid purification process. By providing a sealing groove 107 on the inner wall of the semi-circular shell one 106, when the semi-circular shell two 109 and the semi-circular shell one 106 are combined, the sealing strip 110 will be embedded in the sealing groove 107, thereby enhancing the sealing performance between the two and preventing air leakage during the purification process.

[0030] Embodiment 4 As Figure 5 shown, in this embodiment, a connecting plate 117 is fixedly connected between the outer walls of the semi-circular shell two 109 at both ends. At the central position of the side wall of the connecting plate 117, a helical tooth column 118 is fixedly connected. An inner limiting sleeve 119 is slidably sleeved outside the helical tooth column 118. A limiting block 120 that is slidably connected to the helical tooth column 118 is fixedly connected in the limiting sleeve 119. Two pressing springs 121 that are fixedly connected to the connecting plate 117 are symmetrically fixedly connected to the limiting sleeve 119. A pulling handle 122 is fixedly connected to the end of the helical tooth column 118. A supporting column one 123 is fixedly connected to the bottom end of the limiting sleeve 119; a blocking block 124 is slidably connected in the limiting sleeve 119. The blocking block 124 is engaged with the helical tooth column 118. A return spring 125 is fixedly connected to the inner wall of the blocking block 124.

[0031] During specific implementation, by pulling the pulling handle 122, the helical tooth column 118 can be pulled to slide in the limiting sleeve 119. During the sliding process, the blocking block 124 in the limiting sleeve 119 remains engaged and clamped with the helical tooth column 118 under the pulling of the return spring 125, so as to limit the helical tooth column 118. By pulling, the connecting plate 117 can separate the semi-circular shell two 109 and the semi-circular shell one 106, thereby facilitating manual rotation of the blocking disc 113 in the semi-circular shell two 109 and adding a purification agent to the vortex plate 115, so that the device maintains a good purification effect.

[0032] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0033] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A laboratory air purification and sterilization device, characterized in that: The invention comprises four semicircular shells (106), two adjacent semicircular shells (106) are fixedly connected, one side of the four semicircular shells (106) is abutted against a semicircular shell (109), two adjacent semicircular shells (109) are fixedly connected, two limiting slide rails (111) are fixedly connected to the inner wall of the semicircular shell (109), a fixing ring (114) is slidably connected between the two limiting slide rails (111), a baffle (113) is fixedly connected to the fixing ring (114), a vent (116) is provided on the baffle (113), and the semicircular shell (109) at the bottom is fixedly connected to the inner wall of the semicircular shell (109). One end of an air intake pipe (105) is fixedly connected to the outer wall of the semicircular shell (106), the air intake pipe (105) is connected to the interior of the semicircular shell (106), the other end of the air intake pipe (105) is fixedly connected to the cylinder (103), the end of the cylinder (103) is fixedly provided with an output end of an air extraction pump (101) connected to the interior thereof, a positioning seat (102) is fixedly sleeved on the outer wall of the air extraction pump (101), the bottom end of the positioning seat (102) is fixedly connected to a base plate (201), and the top of the semicircular shell (106) at the top is fixedly connected to an exhaust pipe (108).

2. A laboratory air purification and sterilization device according to claim 1, characterized in that: Three purification barrels (203) are arranged at equal distances on one side of the semicircular shell (106); the bottom of the purification barrel (203) at the bottom end is fixedly connected to the support column (202); L-shaped tubes (204) are fixedly connected to the three purification barrels (203); the ends of the L-shaped tubes (204) are fixedly connected to the outer wall of the semicircular shell (106); a one-way valve (205) is fixedly arranged in the L-shaped tube (204); a three-way tube (206) connected to the interior of the purification barrel (203) is fixedly connected at the center position of the top of the purification barrel (203); one end of a connecting tube (207) is fixedly connected to the outer wall of the three-way tube (206); the other end of the connecting tube (207) is fixedly connected to the outer wall of the semicircular shell (106); and a one-way valve (208) is fixedly arranged in the connecting tube (207).

3. A laboratory air purification and sterilization device according to claim 2, characterized in that the three-way One end of a liquid inlet pipe (209) is fixedly connected to the outer wall of the cylinder (206), the other end of the liquid inlet pipe (209) is fixedly connected to an addition tank (210), a solenoid valve 1 is fixedly provided on the outer wall of the liquid inlet pipe (209), a liquid discharge column (212) connected to the interior of the purification barrel (203) is fixedly connected to the bottom of the purification barrel (203), and a replenishing head (211) is fixedly connected to the top of the addition tank (210).

4. A laboratory air purification and sterilization device according to claim 2, characterized in that: An air purification liquid is arranged inside the purification barrel (203), and the liquid level of the air purification liquid is located in the middle of the purification barrel (203).

5. A laboratory air purification and sterilization device according to claim 2, characterized in that: The top and bottom of the baffle plate (113) are both fixedly connected to a vortex plate (115), and an air purifier is provided on the inner wall of the vortex plate (115).

6. A laboratory air purification and sterilization device according to claim 2, characterized in that: Ultraviolet lamp tubes (112) are fixedly arranged on the inner top wall and the inner bottom wall of the second semicircular shell (109).

7. A laboratory air purification and sterilization device according to claim 2, characterized in that: An activated carbon layer (104) is fixedly disposed inside the cylinder (103).

8. A laboratory air purification and sterilization device according to claim 2, characterized in that: Two sealing grooves (107) are symmetrically formed on the inner wall of the semicircular shell (106), and two sealing strips (110) are symmetrically fixedly connected to the inner wall of the semicircular shell (109), and the sealing strips (110) are embedded and connected to the sealing grooves (107).

9. A laboratory air purification and sterilization device according to claim 2, characterized in that: A connecting plate (117) is fixedly connected between the outer walls of the semicircular shells (109) at both ends, an oblique tooth column (118) is fixedly connected at the center of the side wall of the connecting plate (117), the outer sliding sleeve of the oblique tooth column (118) is connected to a limiting sleeve (119), a limiting block (120) slidably connected to the oblique tooth column (118) is fixedly connected in the limiting sleeve (119), two extrusion springs (121) fixedly connected to the connecting plate (117) are symmetrically fixedly connected to the limiting sleeve (119), a pulling handle (122) is fixedly connected to the end of the oblique tooth column (118), and a supporting column (123) is fixedly connected to the bottom end of the limiting sleeve (119).

10. A laboratory air purification and sterilization device according to claim 9, characterized in that: A stopper (124) is slidably connected in the limiting sleeve (119), the stopper (124) is engaged with the oblique tooth column (118), and a return spring (125) is fixedly connected to the inner wall of the stopper (124).

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