High-pressure closed fluorobenzonitrile synthesis reaction kettle

Abstract

The utility model discloses a high-pressure closed fluorobenzonitrile synthesis reaction kettle, which belongs to the field of reaction kettles and comprises a high-pressure closed reaction kettle, a recovery mechanism is arranged on the right side of the high-pressure closed reaction kettle and comprises a recovery box, a condenser and a recovery tank, and the recovery box is connected with an exhaust pipe through a connecting pipe. The condenser is fixedly connected in the recycling box, the recycling tank is fixedly connected below the recycling box, the recycling mechanism is arranged, when the air pressure in the high-pressure closed reaction kettle is too high, gas can enter the recycling box through a connecting pipe after being exhausted through an exhaust pipe and a safety valve, and the condenser in the recycling box can be used for recycling condensable components in the exhausted gas; and for example, the raw material gas which is not completely reacted is condensed and liquefied and then flows into the recovery tank through the liquid outlet. Therefore, the raw materials which are directly discharged and wasted originally can be recycled and can be put into the production process again, the utilization rate of the raw materials is remarkably improved, the production cost is effectively reduced, and the economic benefits of enterprises are improved.

Description

Technical Field

[0001] This utility model relates to the field of reaction vessels, and in particular to a high-pressure sealed fluorobenzonitrile synthesis reaction vessel. Background Technology

[0002] A high-pressure sealed reactor is a special vessel used for chemical reactions. It achieves controlled reaction conditions through a high-pressure, sealed environment. Its core consists of a pressure vessel body made of stainless steel or alloy steel, a magnetically coupled stirring system, a heating or cooling jacket, and safety protection devices. Designed to withstand pressures from tens to hundreds of megapascals, its internal magnetic stirrer allows for leak-free operation without mechanical seals. It is suitable for processes such as high-temperature, high-pressure polymerization, catalytic hydrogenation, and supercritical fluid reactions. Equipped with pressure sensors, rupture discs, safety valves, and other multi-stage safety devices, it allows for precise control of temperature, pressure, and stirring speed. In chemical synthesis, energy material preparation, and biomedicine, it is used to improve reaction efficiency, optimize product selectivity, and ensure the safety of handling toxic and hazardous media.

[0003] In the prior art, the synthesis of fluorobenzonitrile often requires the use of a high-pressure closed reactor. Chinese utility model patent with publication number "CN222641995U" and patent name "A condensation reaction device for the production of difluorobenzonitrile" discloses a reactor for the synthesis of fluorobenzonitrile. The patent describes a technical solution including "a support base, a condensation reactor fixedly installed through the middle of the surface of the support base, a breathing mechanism provided on the left inner wall of the condensation reactor, the breathing mechanism consisting of a fixed cylinder, an upper air port, a lower air port, a telescopic spring and a sealing piston, a fixed cylinder fixedly installed through the left inner wall of the condensation reactor, an upper air port circumferentially opened on the outer surface of the fixed cylinder above the outer wall of the condensation reactor, a lower air port circumferentially opened on the outer surface of the fixed cylinder below the inner wall of the condensation reactor, telescopic springs fixedly installed at both the upper and lower ends of the inner surface of the fixed cylinder, and a sealing piston fixedly installed at the middle of the opposite end of the telescopic spring, and the sealing piston and the inner wall of the condensation reactor are on the same horizontal line".

[0004] However, the following problems may occur during actual use of this reactor:

[0005] Firstly, from the design of the breathing mechanism of this device, when the internal pressure of the condensation reactor is too high, the gas enters the fixed cylinder through the lower gas port, pushing the sealing piston upward, so that the lower gas port and the upper gas port are connected through the fixed cylinder, and the excess gas inside the condensation reactor is discharged. However, the discharged gas is not directly released into the external environment, because in actual chemical production, the gas produced by the reaction contains unreacted raw materials, and direct discharge may lead to waste of raw materials and increase production costs;

[0006] Second, from an environmental protection perspective, the gas produced by the reaction also contains harmful impurities or substances that pollute the environment. Randomly releasing it will pollute the atmospheric environment and does not meet environmental protection requirements.

[0007] Therefore, in order to solve the above-mentioned technical problems, this utility model proposes a high-pressure closed-type fluorobenzonitrile synthesis reactor. Utility Model Content

[0008] The main objective of this invention is to provide a high-pressure, closed-type fluorobenzonitrile synthesis reactor, which can effectively solve the problems in the background art.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] A high-pressure sealed fluorobenzonitrile synthesis reactor includes a high-pressure sealed reactor. A recovery mechanism is located on the right side of the reactor, comprising a recovery box, a condenser, and a recovery tank. The recovery box is connected to an exhaust pipe via a connecting pipe, and the condenser is fixedly connected inside the recovery box. The recovery tank is fixedly connected below the recovery box. A purification mechanism is also located on the right side of the recovery box, comprising a purification box, a screw knob, a limiting plate, a chemical adsorption filter, and an activated carbon filter. A first valve connects the purification box and the recovery box. The screw knob is movably connected to the side plates on both sides of the bottom surface of the purification box. The screw knob is also movably connected to the limiting plate via a rotating block at its inner end. The chemical adsorption filter and the activated carbon filter are fixedly connected inside the purification box via the limiting plate.

[0011] As a further preferred embodiment of this utility model, an exhaust pipe is fixedly installed on the outer wall of the high-pressure sealed reactor, and a safety valve is fixedly installed on the exhaust pipe.

[0012] When the internal pressure of the high-pressure sealed reactor exceeds the set pressure value of the safety valve, the safety valve automatically opens, allowing the gas inside the high-pressure sealed reactor to be discharged through the exhaust pipe, thereby reducing the pressure inside the high-pressure sealed reactor. This ensures that the high-pressure sealed reactor operates within a safe pressure range, preventing equipment damage or even safety accidents caused by excessive pressure, and ensuring the safety of the production process.

[0013] As a further preferred embodiment of the present invention, a first air inlet is fixedly installed on the left side wall of the recycling bin, and a connecting pipe is fixedly installed between the first air inlet and the safety valve; a first exhaust port is fixedly installed on the right side wall of the recycling bin, and a drain port is fixedly installed on the bottom surface of the recycling bin.

[0014] The gas discharged from the high-pressure closed reactor enters the recovery tank through the first inlet via a connecting pipe. After treatment, the uncondensed gas is discharged from the first exhaust port, while the condensed liquid flows out through the drain port. This process achieves the collection and preliminary separation of the gas discharged from the high-pressure closed reactor, creating conditions for subsequent condensation recovery and purification treatment, which helps to improve the raw material recovery rate and reduce pollutant emissions.

[0015] As a further preferred embodiment of this utility model, a condenser is fixedly installed inside the recycling tank, and a cooling medium inlet is fixedly installed in front of the condenser, and a cooling medium outlet is fixedly installed behind the condenser. A liquid inlet is fixedly installed on the top surface of the recycling tank, and the liquid inlet and the liquid outlet are fixedly installed together. A liquid outlet is fixedly installed on the bottom surface of the recycling tank, and a second valve is fixedly installed on the bottom surface of the liquid outlet.

[0016] The cooling medium enters the condenser through the cooling medium inlet, absorbs heat from the gas, and flows out through the cooling medium outlet, causing the condensable components in the gas to liquefy. The liquefied liquid flows into the recovery tank through the drain port and the inlet port. Opening the second valve can discharge the liquid in the recovery tank, effectively recovering the condensable raw materials in the gas discharged from the high-pressure closed reactor, improving the utilization rate of raw materials, reducing production costs, and reducing the environmental impact of raw material emissions.

[0017] As a further preferred embodiment of the present invention, a second air inlet is fixedly installed on the left side wall of the purification box, and a first valve is fixedly installed between the second air inlet and the first exhaust port; a second exhaust port is fixedly installed on the right side wall of the purification box.

[0018] After being processed by the recovery box, the gas enters the second air inlet of the purification box through the connecting pipe from the first exhaust port when the first valve is opened. After being purified, it is discharged from the second exhaust port. This allows the gas to enter the purification box for treatment according to a predetermined path, which facilitates the control of the gas flow and purification process, ensures the purification effect, and reduces the pollution of the environment caused by the emission of harmful gases.

[0019] As a further preferred embodiment of this utility model, the bottom surface of the purification box is provided with a set of symmetrical mounting openings;

[0020] The installation port provides a channel for the installation of chemical adsorption filters and activated carbon filters, making it easy to insert the filters into the purification chamber for installation. This facilitates the installation and removal of the filters, providing convenience for subsequent maintenance and replacement, and ensuring that the purification chamber can continuously and effectively purify the gas.

[0021] As a further preferred embodiment of this utility model, the chemical adsorption filter and the activated carbon filter are respectively inserted into the installation port, and handles are fixedly installed on the bottom surface of the chemical adsorption filter and the activated carbon filter respectively.

[0022] Chemical adsorption filters remove harmful impurities from gases through chemical reactions, while activated carbon filters remove harmful gases through adsorption. The handle facilitates easy insertion and removal of the filters. This combination of two filters based on different principles effectively purifies harmful components in gases, reducing environmental pollution. The handle design also makes operation of the filters more convenient.

[0023] As a further preferred embodiment of this utility model, a set of symmetrical side plates are fixedly installed on the bottom surface of the purification box, and screw holes are opened on the side walls of the side plates. A set of symmetrical guide holes are also opened on the side walls of the side plates. The screw knob is threadedly connected to the screw holes, and a rotating block is fixedly installed on the inner end of the screw knob. A groove is opened on the outer wall of the limiting plate, and the rotating block is movably installed in the groove. A set of symmetrical guide rods are also fixedly installed on the outer wall of the limiting plate, and the guide rods are inserted into the guide holes. The two limiting plates are respectively located at the bottom of the chemical adsorption filter and the activated carbon filter.

[0024] Rotating the screw knob moves the screw on the side plate via its threaded connection to the screw hole, causing the rotating block to rotate within the groove of the limiting plate. This allows the limiting plate to move under the guidance of the guide rod and guide hole, thus fixing and loosening the filter screen. This structural design firmly secures the filter screen, preventing it from shifting or loosening during purification. It also facilitates the installation and removal of the filter screen, making it easy to perform regular maintenance and replacement, ensuring the normal operation and purification effect of the purification chamber.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] I. The established recovery mechanism allows gas to escape through the exhaust pipe and safety valve when the pressure inside the high-pressure sealed reactor becomes too high. The gas then flows into the recovery tank via a connecting pipe. The condenser inside the recovery tank condenses condensable components in the discharged gas, such as incompletely reacted raw material gas, liquefying them and allowing them to flow into the recovery tank through the drain port. This recovers raw materials that would otherwise be wasted by direct discharge, enabling them to be reused in the production process. This significantly improves raw material utilization, effectively reduces production costs, and enhances the company's economic benefits.

[0027] Second, the purification mechanism ensures that the gas discharged from the recovery box passes through a chemical adsorption filter and an activated carbon filter before entering the atmosphere. The chemical adsorption filter reacts with harmful impurities in the gas, converting them into harmless or less harmful substances. The activated carbon filter, with its abundant microporous structure and large specific surface area, adsorbs harmful gases. After these two layers of filtration, harmful substances in the gas are effectively removed, reducing pollution to the atmospheric environment and ensuring that the exhaust gas emissions of this device meet environmental protection requirements, thus contributing to the green and sustainable development of chemical production.

[0028] Third, in the purification mechanism, the chemical adsorption filter and the activated carbon filter are inserted into the purification chamber through the installation port and fixed by the limiting plate. The limiting plate is controlled by a screw knob through a rotating block. Turning the screw knob can move the limiting plate, thus facilitating the installation or removal of the chemical adsorption filter and the activated carbon filter. In addition, the handle installed on the bottom of the filter further facilitates the operation of the operator. This structural design makes the maintenance and replacement of the filter more convenient, and can promptly replace the failed filter, ensuring the stability and continuity of the purification effect. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0030] Figure 2 This is a structural breakdown diagram of the recycling mechanism of this utility model;

[0031] Figure 3 This is a cross-sectional schematic diagram of the recycling bin of this utility model;

[0032] Figure 4 This is a cross-sectional schematic diagram of the purification box of this utility model;

[0033] Figure 5 This is a structural breakdown diagram of the purification mechanism of this utility model.

[0034] In the diagram: 1. High-pressure sealed reactor; 2. Exhaust pipe; 3. Safety valve; 4. Recovery mechanism; 5. Purification mechanism; 6. Recovery tank; 7. First air inlet; 8. First exhaust port; 9. Liquid outlet; 10. Connecting pipe; 11. First valve; 12. Condenser; 13. Cooling medium inlet; 14. Cooling medium outlet; 15. Recovery tank; 16. Liquid inlet; 17. Liquid outlet; 18. Second valve; 19. Purification tank; 20. Second air inlet; 21. Second exhaust port; 22. Mounting port; 23. Side plate; 24. Screw hole; 25. Guide hole; 26. Screw knob; 27. Rotating block; 28. Limiting plate; 29. ​​Groove; 30. Guide rod; 31. Chemical adsorption filter screen; 32. Activated carbon filter screen; 33. Handle. Detailed Implementation

[0035] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0036] like Figure 1 - Figure 5 As shown, a high-pressure sealed fluorobenzonitrile synthesis reactor includes a high-pressure sealed reactor 1. A recovery mechanism 4 is located on the right side of the high-pressure sealed reactor 1. The recovery mechanism 4 includes a recovery tank 6, a condenser 12, and a recovery container 15. The recovery tank 6 is connected to an exhaust pipe 2 via a connecting pipe 10. The condenser 12 is fixedly connected inside the recovery tank 6. The recovery container 15 is fixedly connected below the recovery tank 6. A purification mechanism 5 is also located on the right side of the recovery tank 6. The purification mechanism 5 includes a purification box 19, a screw knob 26, a limiting plate 28, a chemical adsorption filter 31, and an activated carbon filter 32. A first valve 11 connects the purification box 19 and the recovery box 6. The screw knob 26 is movably connected to the side plates 23 on both sides of the bottom surface of the purification box 19. The screw knob 26 is also movably connected to the limiting plate 28 via a rotating block 27 at its inner end. The chemical adsorption filter 31 and the activated carbon filter 32 are respectively fixedly connected inside the purification box 19 via the limiting plate 28. Example 1:

[0037] like Figure 1 - Figure 3 As shown, an exhaust pipe 2 is fixedly installed on the outer wall of the high-pressure sealed reactor 1, and a safety valve 3 is fixedly installed on the exhaust pipe 2; a first air inlet 7 is fixedly installed on the left side wall of the recovery tank 6, and a connecting pipe 10 is fixedly installed between the first air inlet 7 and the safety valve 3; a first exhaust port 8 is fixedly installed on the right side wall of the recovery tank 6, and a drain port 9 is fixedly installed on the bottom surface of the recovery tank 6; a condenser 12 is also fixedly installed inside the recovery tank 6, and a cooling medium inlet 13 is fixedly installed in front of the condenser 12, and a cooling medium outlet 14 is fixedly installed behind the condenser 12; a liquid inlet 16 is fixedly installed on the top surface of the recovery tank 15, and the liquid inlet 16 and the drain port 9 are fixedly installed together; a liquid outlet 17 is fixedly installed on the bottom surface of the recovery tank 15, and a second valve 18 is fixedly installed on the bottom surface of the liquid outlet 17;

[0038] The specific operating principle of the recycling mechanism 4 in conjunction with the high-pressure sealed reactor 1 is as follows:

[0039] When the internal pressure of the high-pressure sealed reactor 1 exceeds the set pressure value of the safety valve 3, the safety valve 3 automatically opens, allowing the gas inside the high-pressure sealed reactor 1 to be discharged through the exhaust pipe 2 into the connecting pipe 10, thereby reducing the pressure inside the high-pressure sealed reactor. The gas discharged into the connecting pipe 10 will then enter the recovery tank 6 through the first air inlet 7 installed on the left side wall of the recovery tank 6. When the gas comes into contact with the condenser 12 installed inside the recovery tank 6, the cooling medium enters the condenser 12 from the cooling medium inlet 13 installed in front of the condenser 12. After the condenser 12 absorbs heat from the gas, the cooling medium exits from the cooling medium outlet 13 installed behind the condenser 12. 4. The gas flows out, liquefying the condensable components in the gas. After liquefaction, the gas is discharged through the drain port 9 installed on the bottom of the recovery tank 6, and then enters the recovery tank 15 through the inlet port 16 installed on the top of the recovery tank 15 for recycling and storage. When further processing of the liquid raw materials recovered in the recovery tank 15 is required, the second valve 18 can be opened to discharge the liquid raw materials in the recovery tank 15 through the outlet port 17 installed on the bottom of the recovery tank 15. This allows the raw materials that were originally wasted by direct discharge to be recovered and put back into the production process, significantly improving the utilization rate of raw materials, effectively reducing production costs, and improving the economic benefits of the enterprise. Example 2:

[0040] like Figure 4 and Figure 5 As shown, a second air inlet 20 is fixedly installed on the left side wall of the purification chamber 19, and a first valve 11 is fixedly installed between the second air inlet 20 and the first exhaust port 8. A second exhaust port 21 is fixedly installed on the right side wall of the purification chamber 19. A set of symmetrical mounting openings 22 are provided on the bottom surface of the purification chamber 19. A chemical adsorption filter 31 and an activated carbon filter 32 are respectively inserted into the mounting openings 22, and handles 33 are fixedly installed on the bottom surfaces of the chemical adsorption filter 31 and the activated carbon filter 32 respectively. A set of symmetrical side plates 2 are also fixedly installed on the bottom surface of the purification chamber 19. 3. A screw hole 24 is provided on the side wall of the side plate 23, and a set of symmetrical guide holes 25 are also provided on the side wall of the side plate 23. The screw knob 26 is threadedly connected to the screw hole 24, and a rotating block 27 is fixedly installed on the inner end of the screw knob 26. A groove 29 is provided on the outer wall of the limiting plate 28, and the rotating block 27 is movably installed in the groove 29. A set of symmetrical guide rods 30 are also fixedly installed on the outer wall of the limiting plate 28, and the guide rods 30 are inserted into the guide holes 25. The two limiting plates 28 are located at the bottom of the chemical adsorption filter screen 31 and the activated carbon filter screen 32, respectively.

[0041] The specific operating principle of the purification mechanism 5 in conjunction with the high-pressure sealed reactor 1 is as follows:

[0042] Using handle 33, insert the chemical adsorption filter 31 and activated carbon filter 32 from left to right into the purification chamber 19 through the symmetrical mounting openings 22 on the bottom surface of the purification chamber 19. Then, rotate the screw knob 26 located on the outer wall of the side plates 23 on both sides of the bottom surface of the purification chamber 19. The screw knob 26 will rotate within the screw hole 24 on the side wall of the side plate 23, and the rotating block 27 installed on the inner end of the screw knob 26 will rotate within the groove 29 on the outer wall of the limiting plate 28. The screw knob 26 rotates synchronously, and after continuously rotating the screw knob 26, the screw knob 26 will push the limiting plate 28 inward through the rotating block 27, and the guide rod 30 installed on the outer wall of the limiting plate 28 will move along the guide hole 25 opened on the outer wall of the side plate 23, providing guidance for the movement of the limiting plate 28 until the limiting plate 28 is placed at the bottom of the filter screen, which can restrict the filter screen and prevent the chemical adsorption filter screen 31 and activated carbon filter screen 32 from moving out of the purification box 19.

[0043] After the recovery box 6 completes the condensation and recovery of the raw materials in the gas, the first valve 11 can be opened to allow the gas in the recovery box 6 to be discharged through the first exhaust port 8 installed on the right side wall of the recovery box 6, and enter the purification box 19 through the second air inlet 20. When the gas is discharged through the second exhaust port 21 on the right side of the purification box 19, it will pass through the chemical adsorption filter 31 and the activated carbon filter 32 from left to right. At this time, the chemical adsorption filter 31 can react with the harmful impurities in the gas and convert them into harmless or low-harm substances, while the activated carbon filter 32 uses its rich microporous structure and huge specific surface area to adsorb the harmful gas. After these two layers of filtration, the harmful substances in the gas are effectively removed, reducing the pollution to the atmospheric environment and making the exhaust gas emission meet the environmental protection requirements.

[0044] When the gas purification effect of the chemical adsorption filter 31 and the activated carbon filter 32 decreases after long-term use, the screw knob 26 can be rotated in the opposite direction to move the limiting plate 28 outward through the rotating block 27. After the limiting plate 28 is removed from the bottom of the filter, the chemical adsorption filter 31 and the activated carbon filter 32 can be pulled out of the purification box 19 through the installation port 22 using the handle 33 for cleaning or replacement. This allows for timely replacement of the failed filters, ensuring the stability and continuity of the purification effect.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A high-pressure sealed fluorobenzonitrile synthesis reactor, comprising a high-pressure sealed reactor (1), characterized in that: The high-pressure sealed reactor (1) is provided with a recovery mechanism (4) on the right side, and the recovery mechanism (4) includes a recovery box (6), a condenser (12) and a recovery tank (15). The recovery box (6) is connected to the exhaust pipe (2) through a connecting pipe (10), and the condenser (12) is fixedly connected inside the recovery box (6). The recovery tank (15) is fixedly connected below the recovery box (6). The recovery box (6) is also provided with a purification mechanism (5) on the right side, and the purification mechanism (5) includes a purification box (19) and a screw knob (26). The purification box (19) is connected to the recovery box (6) by a first valve (11), and the screw knob (26) is movably connected to the side plates (23) on both sides of the bottom surface of the purification box (19). The screw knob (26) is also movably connected to the limiting plate (28) through the rotating block (27) at the inner end. The chemical adsorption filter (31) and the activated carbon filter (32) are respectively fixedly connected to the inside of the purification box (19) through the limiting plate (28).

2. The high-pressure sealed synthesis reactor for flumioxazin according to claim 1, characterized in that: An exhaust pipe (2) is fixedly installed on the outer wall of the high-pressure sealed reactor (1), and a safety valve (3) is fixedly installed on the exhaust pipe (2).

3. The high-pressure sealed synthesis reactor for flumioxazin according to claim 2, characterized in that: A first air inlet (7) is fixedly installed on the left side wall of the recycling box (6), and a connecting pipe (10) is fixedly installed between the first air inlet (7) and the safety valve (3). A first exhaust port (8) is fixedly installed on the right side wall of the recycling box (6), and a drain port (9) is fixedly installed on the bottom surface of the recycling box (6).

4. The high-pressure sealed synthesis reactor for flumioxazin according to claim 3, characterized in that: The recycling tank (6) is also fixedly installed with a condenser (12), and a cooling medium inlet (13) is fixedly installed in front of the condenser (12). A cooling medium outlet (14) is fixedly installed behind the condenser (12). A liquid inlet (16) is fixedly installed on the top surface of the recycling tank (15), and the liquid inlet (16) and the liquid outlet (9) are fixedly installed together. A liquid outlet (17) is fixedly installed on the bottom surface of the recycling tank (15), and a second valve (18) is fixedly installed on the bottom surface of the liquid outlet (17).

5. The high-pressure sealed synthesis reactor for mefloquine according to claim 4, characterized in that: A second air inlet (20) is fixedly installed on the left side wall of the purification box (19), and a first valve (11) is fixedly installed between the second air inlet (20) and the first exhaust port (8). A second exhaust port (21) is fixedly installed on the right side wall of the purification box (19).

6. The high-pressure sealed synthesis reactor for mefloquine according to claim 5, characterized in that: The bottom surface of the purification box (19) is provided with a set of symmetrical mounting ports (22).

7. The high-pressure sealed synthesis reactor for mefloquine according to claim 6, characterized in that: The chemical adsorption filter (31) and the activated carbon filter (32) are respectively inserted into the installation port (22), and handles (33) are respectively fixedly installed on the bottom surface of the chemical adsorption filter (31) and the activated carbon filter (32).

8. The high-pressure sealed synthesis reactor for mefloquine according to claim 7, characterized in that: The bottom surface of the purification box (19) is also fixedly installed with a set of left and right symmetrical side plates (23), and the side wall of the side plate (23) is provided with screw holes (24). The side wall of the side plate (23) is also provided with a set of symmetrical guide holes (25). The screw knob (26) is threadedly connected to the screw hole (24), and the inner end of the screw knob (26) is fixedly installed with a rotating block (27). The outer side wall of the limiting plate (28) is provided with a groove (29), and the rotating block (27) is movably installed in the groove (29). The outer side wall of the limiting plate (28) is also fixedly installed with a set of symmetrical guide rods (30), and the guide rods (30) are inserted into the guide holes (25). The two limiting plates (28) are located at the bottom of the chemical adsorption filter (31) and the activated carbon filter (32), respectively.

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