Multilayer filtration sterile biochemical incubator

Abstract

The invention provides a multi-layer filtration sterile biochemical incubator, and relates to the technical field of biochemical experiments, the multi-layer filtration sterile biochemical incubator comprises a sterile incubator, an air filter box is arranged below the sterile incubator, and the interior of the air filter box is divided into an air pressurization cavity, an illumination sterilization cavity and four air filter cavities through partition plates; a pressurizing air port is formed in the right side of the air pressurizing cavity, a fan mounting plate is fixedly connected to the interior of the air pressurizing cavity, air filtered by the multiple stages of filter elements enters the air flow guide box, and the air is subjected to illumination sterilization through the ultraviolet lamp tubes, so that it is ensured that the air entering the culture box is sterile, and the sterility of the internal environment of the sterile culture box is maintained; the problems that due to too strict sealing, the humidity in the incubator is too high, oxygen is excessively consumed, biological growth is not facilitated, the experiment effect is affected, and if ventilation and ventilation of the incubator are conducted in the culture process, ventilation air filtration and disinfection are insufficient, bacteria enter the incubator along with air easily, and the experiment accuracy is affected are solved.

Description

Technical Field

[0001] The invention relates to the technical field of biochemical experiments, in particular to a multi-layer filtering sterile biochemical incubator. Background Art

[0002] A biochemical incubator is a device designed specifically for high-cleanliness biological experiments. Its core function is to achieve an absolutely sterile environment within the incubator. It is mainly used in scientific research scenarios such as microbial culture, cell experiments, and tissue culture where contamination must be strictly avoided. It is commonly used in biomedicine, agricultural breeding, environmental monitoring and other fields.

[0003] For microbial culture experiments, overly strict sealing will cause excessive humidity in the incubator and excessive oxygen consumption, which is not conducive to the growth of organisms and affects the experimental results. If the incubator is ventilated during the culture process, and the air filtration and disinfection are not sufficient, it is easy for bacteria to enter the box with the air, affecting the accuracy of the experiment. Summary of the Invention

[0004] The present invention discloses a multi-layer filtered sterile biochemical incubator to solve the problem that when a completely sealed incubator is used to carry out a culture experiment on some aerobic microorganisms, as the oxygen inside the incubator is consumed, the oxygen content inside the incubator is insufficient, which easily leads to abnormal microbial culture and affects the experimental results. If the incubator is ventilated during the culture process and the air filtration and disinfection of the ventilation air are not sufficient, bacteria can easily enter the box with the air, affecting the accuracy of the experiment.

[0005] The first aspect of the present disclosure provides a multi-layer filtered sterile biochemical incubator, specifically comprising: a sterile incubator, an air filter box is provided below the sterile incubator, an air pressurization chamber, a light sterilization chamber and four air filter chambers are divided into the interior of the air filter box by a partition, a pressurized air port is provided on the right side of the air pressurization chamber, a fan mounting plate is fixedly connected to the interior of the air pressurization chamber, a pressurized fan is installed in the middle of the fan mounting plate, an air outlet end of the pressurized fan faces the cavity connected to the air filter chamber through a pipe, a partition plate is fixedly connected to the interior of the air filter chamber, two filter cartridges are fixedly connected to the partition plate, and the rear of the air filter chamber is vertically connected to The filter chamber guide rod has an insert tube blocking plate slidably connected to the filter chamber guide rod, a blocking plate guide tube is provided in front of the insert tube blocking plate, a trigger push plate is fixedly connected to the front end of the blocking plate guide tube, and the trigger push plate is provided with a push plate through hole. A sealing top spring is provided between the insert tube blocking plate and the rear cavity surface of the air filter chamber. A cylindrical air filter element is installed in the filter cartridge insert tube, and the outer end of the cylindrical air filter element is threadedly connected to the filter cartridge assembly port. The cavity in front of the internal partition plate of the right air filter chamber in the two adjacent air filter chambers is connected to the cavity behind the internal partition plate of the left air filter chamber through a pipe. An air guide box is installed inside the light sterilization chamber, and the air guide box is connected to the air filter chamber, and the air guide box is connected to the inside of the sterile incubator through a gas pipeline.

[0006] Furthermore, the air guide box is tightly inserted into the light sterilization chamber, and guide baffles are staggeredly distributed inside the air guide box. The guide baffles are provided with lamp sockets, and the guide baffles are made of transparent glass.

[0007] Furthermore, the front end of the air guide box is fixedly connected to a lamp tube mounting seat by screws, the lamp tube mounting seat is connected to the front surface of the air filter box by screws, and two ultraviolet lamps are installed behind the lamp tube mounting seat, and the ultraviolet lamps are located inside the air guide box.

[0008] Furthermore, the ultraviolet lamp tube is inserted into the lamp tube socket, and the lower end of the air pipeline is tightly inserted above the front end of the air guide box.

[0009] Furthermore, an opening is provided on the partition between the light sterilization chamber and the air filter chamber at the left end, and an opening docking with the opening is provided on the rear right wall of the air guide box, and the air filter chamber and the air guide box are connected through the two openings.

[0010] Furthermore, a sterile air inlet ring is installed at the bottom of the sterile incubator, a gas pipeline is connected to the bottom of the sterile air inlet ring, and distributed air inlet holes are opened through the inner ring surface of the sterile air inlet ring.

[0011] Furthermore, an exhaust ring is installed at the top of the interior of the sterile incubator, and the inner ring surface of the exhaust ring is penetrated by distributed exhaust holes, and the upper end of the exhaust ring is fixedly connected to an external exhaust pipe.

[0012] Furthermore, the outer end of the external exhaust pipe extends to above the sterile incubator, and a one-way air valve is installed at the upper end of the external exhaust pipe, with the exhaust end of the one-way air valve facing outward.

[0013] Furthermore, the four cylindrical air filter elements inside the air filter chamber from right to left are respectively a large particle filter element, a small particle filter element, a microbial filter element, and an activated carbon filter element.

[0014] The present invention provides a multi-layer filtration sterile biochemical incubator, which has the following beneficial effects: The biochemical incubator of the present invention has an air external circulation function, and the interior of the incubator can be ventilated during the microbial cultivation process to avoid the adverse effects of excessive humidity and excessive oxygen consumption in the sealed incubator on the growth of microorganisms. At the same time, multiple groups of cylindrical air filter elements with different functions are provided, so that the air flows through multiple cylindrical air filter elements and then enters the incubator. Impurities such as floating matter and dust in the air are intercepted by large-particle filter elements and small-particle filter elements. The air that has passed the primary filtration passes through the microbial filter element to intercept bacteria and viruses in the air. Finally, the activated carbon filter element intercepts viruses and tiny particles in the air. The air that has passed the multi-stage filter element filtration enters the air guide box, and the air is sterilized by light through an ultraviolet lamp to ensure that the air entering the incubator is sterile, thereby maintaining the sterility of the internal environment of the sterile incubator.

[0015] In addition, through the setting of the sterile air inlet ring and the exhaust ring, the air enters the sterile air inlet ring through the air pipeline after being filtered and sterilized, and flows inside the sterile air inlet ring. It is sprayed toward the center of the sterile air inlet ring through the dispersed air inlet holes, so that the air flow entering the sterile incubator is dispersed, which can prevent the air flow from being too concentrated and affecting the growth of microorganisms in the culture dishes inside the sterile incubator. After the air enters the sterile incubator, the air pressure increases, and the air is discharged from the sterile incubator through the dispersed exhaust holes, the external exhaust pipe and the one-way air valve. The dispersed exhaust holes also prevent the concentrated flow of air from affecting the growth of microorganisms, and at the same time prevent the spores produced by the growth of microorganisms from drifting under the high-speed airflow and affecting the growth of microorganisms in different culture dishes inside the box. The one-way air valve is opened during the exhaust process, and the one-way air valve is closed when the exhaust is stopped, so as to prevent external air from entering the sterile incubator through the external exhaust pipe and causing pollution.

[0016] In addition, two cartridge air filter elements are installed inside the same air filter chamber. Air enters the cartridge air filter element through the cartridge insert, and the air passes through the cartridge air filter element wall to be filtered. During the operation of the incubator, when the cartridge air filter element is pulled out, as the cartridge air filter element separates from the cartridge insert, the sealing top spring pushes the insert baffle forward, and the end of the cartridge filter element is sealed by the insert baffle, so that the cartridge insert without the cartridge air filter element is sealed, and unfiltered air is prevented from entering the space in front of the partition plate. At this time, the air is continued to be filtered by the other cartridge air filter element inside the same air filter chamber, so that the air pressure inside the air filter chamber is greater than the external air pressure, thereby preventing external air from entering the air filter chamber through the vacant cartridge assembly port, effectively solving the problem of external unclean air easily entering during the process of replacing or cleaning the filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0018] The drawings described below only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0019] In the attached figure: Figure 1 A schematic diagram showing the overall structure of the present application; Figure 2 A schematic diagram showing the interior structure of the sterile incubator of the present application is shown; Figure 3 Shows a schematic structural diagram of the exhaust ring of the present application; Figure 4 It shows a schematic diagram of the structure of the rear of the sterile incubator of the present application; Figure 5 It shows a schematic structural diagram of the air filter box of the present application in a state of being connected to a sterile air intake ring; Figure 6 Shows a schematic diagram of the structure inside the air filter box of the present application; Figure 7 A schematic diagram showing the internal cavity distribution state of the air filter box of the present application; Figure 8 It shows a schematic structural diagram of the plug-in plug-in plate of the present application when it is cut open; Figure 9 Shows this application Figure 8 Schematic diagram of the top view structure; Figure 10 Shows a schematic structural diagram of the air guide box of the present application; Figure 11 Shows a schematic structural diagram of the guide baffle of the present application; Figure 12 It shows a schematic diagram of the structure when the plug-in plug-in plate and the filter cartridge plug-in are separated; Figure 13 It shows a schematic diagram of the structure of the trigger push plate of the present application; Figure 14 Shows the application Figure 9 A schematic diagram of the partially enlarged structure at point A in the middle; Figure 15 Shows the application Figure 9 Schematic diagram of the locally enlarged structure at point B in the middle.

[0020] Reference Signs List 1. Sterile incubator; 2. Air filter box; 3. Sterile air inlet ring; 301. Distributed air inlet hole; 4. Exhaust ring; 401. Distributed exhaust hole; 402. External exhaust pipe; 403. One-way air valve; 5. Air pressurization chamber; 501. Pressurization air port; 502. Fan mounting plate; 503. Pressurization fan; 6. Air filter chamber; 601. Partition plate; 602. Filter cartridge insert; 604. Filter chamber guide rod; 605. Sealing top spring; 607. Insert plug; 608. Plug guide; 610. Trigger push plate; 611. Push plate through hole; 612. Filter cartridge assembly port; 7. Cartridge air filter element; 8. Light sterilization chamber; 9. Air guide box; 901. Guide partition; 902. Lamp socket; 903. Lamp mounting base; 904. Ultraviolet lamp; 905. Gas pipeline. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figures 1 to 15 : The present invention proposes a multi-layer filtering sterile biochemical incubator, comprising: a sterile incubator 1, an air filter box 2 is provided below the sterile incubator 1, an air pressurizing chamber 5, a light sterilizing chamber 8 and four air filter chambers 6 are provided inside the air filter box 2 through a partition, a pressurized air port 501 is provided on the right side of the air pressurizing chamber 5, a fan mounting plate 502 is fixedly connected to the inside of the air pressurizing chamber 5, a pressurizing fan 503 is installed in the middle of the fan mounting plate 502, an air outlet end of the pressurizing fan 503 is connected to the air filter chamber 6 through a pipeline, a partition plate 601 is fixedly connected to the inside of the air filter chamber 6, two filter cartridge inserts 602 are fixedly connected to the partition plate 601, a filter chamber guide rod 604 is vertically connected to the rear of the air filter chamber 6, and a filter chamber guide rod 604 is slidably connected to the filter chamber guide rod 604. Insert the tube plugging plate 607, and a plugging plate guide tube 608 is provided in front of the inserting tube plugging plate 607. The front end of the plugging plate guide tube 608 is fixedly connected to a trigger push plate 610. The trigger push plate 610 is provided with a push plate through hole 611. A sealing top spring 605 is provided between the inserting tube plugging plate 607 and the rear cavity surface of the air filter chamber 6. A cylindrical air filter element 7 is installed in the filter cartridge inserting tube 602. The outer end of the cylindrical air filter element 7 is threadedly connected to the filter cartridge assembly port 612. The cavity in front of the internal partition plate 601 of the right air filter chamber 6 in the two adjacent air filter chambers 6 is connected to the cavity behind the internal partition plate 601 of the left air filter chamber 6 through a pipeline. An air guide box 9 is installed inside the light sterilization chamber 8. The air guide box 9 is connected to the air filter chamber 6. The air guide box 9 is connected to the inside of the sterile incubator 1 through the gas pipeline 905;When the incubator is in use, the microbial culture dish is placed inside the sterile incubator 1 and the door is closed. During the incubation process, the pressurized fan 503 is turned on, and the air is pushed and transported to the rear of the left air filter chamber 6 through the pressurized fan 503. The air enters through the filter cartridge insert 602 and enters the interior of the cylindrical air filter element 7. When the air passes through the cylinder wall of the cylindrical air filter element 7, the cylindrical air filter element 7 intercepts impurities in the air, so that the filtered air enters the front of the air filter chamber 6 and enters the rear of the left air filter chamber 6 along the pipe. During the air circulation process, the air passes through four cylindrical air filter elements 7. The cylindrical air filter elements 7 inside the four air filter chambers 6 from right to left are large particle filter element, small particle filter element, microbial filter element, and activated carbon filter element respectively. The four cylindrical air filter elements 7 can filter particles, bacteria, and pathogens in the air. The air is filtered through multiple layers, and the air flowing through the four air filter chambers 6 eventually enters the air guide box 9. When replacing or cleaning the cartridge air filter element 7, the cartridge air filter element 7 is removed. As the cartridge air filter element 7 separates from the cartridge insert 602, the sealing top spring 605 pushes the insert plug 607 forward, sealing the end of the cartridge insert 602 through the insert plug 607, sealing the cartridge insert 602 without the cartridge air filter element 7, and preventing unfiltered air from entering the space in front of the partition plate 601. At this time, the air continues to be filtered by another cartridge air filter element 7 in the same air filter chamber 6, making the internal air pressure of the air filter chamber 6 greater than the external air pressure, thereby preventing external air from entering the air filter chamber 6 through the vacant cartridge assembly port 612, and preventing the entry of external unclean air during the replacement or cleaning of the filter element.

[0023] In the embodiment of the present disclosure, the partition between the light sterilization chamber 8 and the air filter chamber 6 at the left end is provided with an opening, and the rear of the right wall of the air guide box 9 is provided with an opening docking with it. The air filter chamber 6 and the air guide box 9 are connected through the two openings, so that the air inside the air filter chamber 6 enters the air guide box 9. The air guide box 9 is tightly inserted into the light sterilization chamber 8. The air guide box 9 is staggered with guide baffles 901 distributed inside the air guide box 9. The guide baffles 901 are provided with lamp sockets 902. The guide baffles 901 are made of transparent glass; the front end of the air guide box 9 is fixedly connected to the lamp mounting seat 903 by screws, and the lamp mounting seat The seat 903 is connected to the front surface of the air filter box 2 by screws, and two ultraviolet lamp tubes 904 are installed behind the lamp tube mounting seat 903. The ultraviolet lamp tubes 904 are located inside the air guide box 9; the ultraviolet lamp tubes 904 are inserted into the lamp tube socket 902, and the lower end of the air supply pipe 905 is tightly inserted above the front end of the air guide box 9; after the filtered air enters the air guide box 9, it flows forward along the channel formed by the guide baffle 901. In this process, the air is irradiated by the ultraviolet lamp tubes 904 to kill bacteria or viruses in the air, further ensuring the sterility of the air entering the sterile incubator 1.

[0024] Example 2. On the basis of Example 1, a sterile air inlet ring 3 is installed at the bottom of the sterile incubator 1, and a gas pipeline 905 is connected below the sterile air inlet ring 3. The inner ring surface of the sterile air inlet ring 3 is penetrated with distributed air inlet holes 301. An exhaust ring 4 is installed at the top of the sterile incubator 1. The inner ring surface of the exhaust ring 4 is penetrated with distributed exhaust holes 401. The upper end of the exhaust ring 4 is fixedly connected with an external exhaust pipe 402. The outer end of the external exhaust pipe 402 extends to the top of the sterile incubator 1. A one-way air valve 403 is installed at the upper end of the external exhaust pipe 402, and the exhaust end of the one-way air valve 403 faces outward; after filtration and sterilization, the air enters the interior of the sterile air inlet ring 3 through the gas pipeline 905 and flows inside the sterile air inlet ring 3. The air moves and is sprayed toward the center of the sterile air inlet ring 3 through the dispersed air inlet holes 301, so that the air flow entering the sterile incubator 1 is dispersed. After the air enters the sterile incubator 1, the air pressure increases, so that the air is discharged from the sterile incubator 1 through the dispersed exhaust holes 401, the external exhaust pipe 402 and the one-way air valve 403. The dispersed exhaust holes 401 also prevent the concentrated flow of air from affecting the growth of microorganisms, and at the same time prevent the spores produced by the growth of microorganisms from drifting under the drive of high-speed airflow and affecting the growth of microorganisms in different culture dishes inside the box. The one-way air valve 403 is opened during the exhaust process, and is closed when the exhaust is stopped, so as to prevent external air from entering the sterile incubator 1 through the external exhaust pipe 402.

[0025] The working principle of this embodiment is as follows: first, the microbial culture dish is placed inside the sterile incubator 1 and the door is closed. During the incubation process, the pressurized fan 503 is turned on, and the air is pushed and transported to the rear of the left air filter chamber 6 through the pressurized fan 503. The air enters through the filter cartridge insert 602 and enters the interior of the cylindrical air filter element 7. When the air passes through the cylinder wall of the cylindrical air filter element 7, the impurities in the air are intercepted by the cylindrical air filter element 7, so that the filtered air enters the front of the air filter chamber 6 and enters the rear of the left air filter chamber 6 along the pipeline. During the air circulation process, the air passes through four cylindrical air filter elements 7. The cylindrical air filter elements 7 inside the four air filter chambers 6 from right to left are respectively a large particle filter element, a small particle filter element, a microbial filter element, and an activated carbon filter element. The four cylindrical air filter elements 7 perform multi-layer filtration on particles, bacteria, and viruses in the air. The air flowing through the four air filter chambers 6 finally enters the interior of the air guide box 9, and flows forward along the channel formed by the guide baffle 901. During this process, the air is irradiated by the ultraviolet lamp 904 to kill bacteria or viruses in the air. After being filtered and sterilized, the air enters the sterile air inlet ring 3 through the air supply pipe 905, flows inside the sterile air inlet ring 3, and is sprayed toward the center of the sterile air inlet ring 3 through the dispersed air inlet holes 301 to disperse the air. After the air enters the sterile incubator 1, the air pressure increases, and the air is discharged from the sterile incubator 1 through the dispersed exhaust holes 401, the external exhaust pipe 402 and the one-way air valve 403 to prevent the humidity and oxygen content of the air inside the sterile incubator 1 from changing due to the growth of microorganisms. The dispersed exhaust holes 401 also prevent the concentrated flow of air from affecting the growth of microorganisms, and at the same time prevent the spores produced by the growth of microorganisms from drifting away under the drive of high-speed airflow and affecting the growth of microorganisms in different culture dishes inside the box. The outer end of the external exhaust pipe 402 can be connected to an external waste gas collection and treatment device to further sterilize the air flowing out during the incubation process and then discharge it, so as to prevent the microorganisms in the air from affecting the laboratory environment.

[0026] In this article, there are several points to note: 1. The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure. Other structures may refer to conventional designs.

[0027] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to form new embodiments.

[0028] The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A multi-layer filtration sterile biochemical incubator, comprising: A sterile incubator (1), wherein an air filter box (2) is provided below the sterile incubator (1), characterized in that an air pressurizing chamber (5), a light sterilizing chamber (8) and four air filter chambers (6) are provided inside the air filter box (2) through a partition, a pressurized air port (501) is provided on the right side of the air pressurizing chamber (5), a fan mounting plate (502) is fixedly connected inside the air pressurizing chamber (5), a pressurizing fan (503) is installed in the middle of the fan mounting plate (502), an air outlet end of the pressurizing fan (503) is connected to the air filter chamber (6) through a pipeline, a partition plate (601) is fixedly connected inside the air filter chamber (6), two filter cartridge inserts (602) are fixedly connected to the partition plate (601), a filter chamber guide rod (604) is vertically connected to the rear of the air filter chamber (6), and a filter cartridge plug plate (603) is slidably connected to the filter chamber guide rod (604). 7), a plugging plate guide tube (608) is provided in front of the plugging plate (607), and a trigger push plate (610) is fixedly connected to the front end of the plugging plate guide tube (608), and a push plate through hole (611) is opened in the trigger push plate (610). A sealing top spring (605) is provided between the plugging plate (607) and the rear cavity surface of the air filter chamber (6). A cylindrical air filter element (7) is installed in the filter cartridge plug (602), and the outer end of the cylindrical air filter element (7) is threadedly connected to the filter cartridge assembly port (612). The front cavity of the internal partition plate (601) of the right air filter chamber (6) in the two adjacent air filter chambers (6) is connected to the rear cavity of the internal partition plate (601) of the left air filter chamber (6) through a pipeline. An air guide box (9) is installed inside the light sterilization chamber (8), and the air guide box (9) is connected to the air filter chamber (6). The air guide box (9) is connected to the inside of the sterile incubator (1) through the gas pipeline (905).

2. A multi-layer filtration sterile biochemical incubator according to claim 1, characterized in that: The air guide box (9) is tightly inserted into the interior of the light sterilization chamber (8), and guide baffles (901) are staggeredly distributed inside the air guide box (9). The guide baffles (901) are provided with lamp tube sockets (902), and the guide baffles (901) are made of transparent glass.

3. A multi-layer filtration sterile biochemical incubator according to claim 2, characterized in that: The front end of the air guide box (9) is fixedly connected to a lamp tube mounting seat (903) via screws, the lamp tube mounting seat (903) is connected to the front surface of the air filter box (2) via screws, and two ultraviolet lamp tubes (904) are installed behind the lamp tube mounting seat (903), and the ultraviolet lamp tubes (904) are located inside the air guide box (9).

4. A multi-layer filtration sterile biochemical incubator according to claim 3, characterized in that: The ultraviolet lamp tube (904) is inserted into the lamp tube socket (902), and the lower end of the air delivery pipe (905) is tightly inserted above the front end of the air guide box (9).

5. The multi-layer filtration sterile biochemical incubator according to claim 1, characterized in that: An opening is provided on the partition between the light sterilization chamber (8) and the air filter chamber (6) at the left end, and an opening connected to the air guide box (9) is provided on the rear right wall of the air guide box (9). The air filter chamber (6) and the air guide box (9) are connected through the two openings.

6. The multi-layer filtration sterile biochemical incubator according to claim 5, characterized in that: A sterile air inlet ring (3) is installed at the bottom of the sterile incubator (1). The sterile air inlet ring (3) is connected to a gas pipeline (905) below. Distributed air inlet holes (301) are opened through the inner ring surface of the sterile air inlet ring (3).

7. A multi-layer filtration sterile biochemical incubator according to claim 6, characterized in that: An exhaust ring (4) is installed on the top of the interior of the sterile incubator (1), and distributed exhaust holes (401) are provided through the inner ring surface of the exhaust ring (4). An external exhaust pipe (402) is fixedly connected to the upper end of the exhaust ring (4).

8. The multi-layer filtration sterile biochemical incubator according to claim 7, characterized in that: The outer end of the external exhaust pipe (402) extends to the top of the sterile incubator (1), and a one-way air valve (403) is installed at the upper end of the external exhaust pipe (402), with the exhaust end of the one-way air valve (403) facing outward.

9. The multi-layer filtration sterile biochemical incubator according to claim 1, characterized in that: The four cylindrical air filter elements (7) inside the air filter chamber (6) from right to left are respectively a large particle filter element, a small particle filter element, a microbial filter element, and an activated carbon filter element.

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