Active agent adding device for NMN enzyme catalytic reaction

By designing an automated device for pushing the plug, cleaning the nozzle, and draining the pipe, the problems of cumbersome disassembly and incomplete cleaning of the surfactant addition device were solved, enabling quantitative addition of surfactant and all-round cleaning, thereby improving reaction accuracy and equipment lifespan.

CN224119003UActive Publication Date: 2026-04-14BICELLS SCI LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-30
Publication Date
2026-04-14

AI Technical Summary

Technical Problem

Existing surfactant addition devices are cumbersome to disassemble and reassemble after use, which can easily damage the equipment. Furthermore, manual cleaning is difficult to ensure thoroughness, resulting in surfactant residues that affect reaction results and equipment lifespan.

Method used

A device comprising a push plug, a cleaning nozzle, a drain pipe, and a snap-fit ​​assembly was designed. The device controls the quantitative addition of surfactant and automatic cleaning via an electric push rod, simplifying the operation process and reducing manual intervention.

Benefits of technology

It enables automated quantitative addition of surfactants and comprehensive cleaning, reducing the risk of equipment damage and improving reaction accuracy and equipment lifespan.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the field of enzyme catalytic reaction auxiliary devices, in particular to an active agent adding device for NMN enzyme catalytic reaction. The active agent adding device for the NMN enzyme catalytic reaction comprises a reactor body, a pushing plug, a cleaning spray head, a blow-off pipe and a clamping assembly, a cylinder body for containing an active agent is arranged at the top of the reactor body, the bottom of the cylinder body communicates with the top of the reactor body through a connecting pipe, and the pushing plug for pushing the active agent is installed in the cylinder body; and a cleaning nozzle for cleaning the inner wall of the cylinder body is mounted in the pushing plug. According to the active agent adding device for the NMN enzyme catalytic reaction, due to the integrated design of the pushing plug and the cleaning spray head and the convenient butt joint of the blow-off pipe and the connecting pipe, tedious disassembly and assembly are not needed during cleaning; a worker can complete cleaning through simple operation according to a set process, so that the maintenance difficulty and the time cost are greatly reduced, and the risk of equipment damage caused by frequent disassembly and assembly is reduced.
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Description

Technical Field

[0001] This utility model relates to the field of enzyme catalytic reaction auxiliary devices, and in particular to an active agent addition device for NMN enzyme catalytic reaction. Background Technology

[0002] NMN, or β-nicotinamide mononucleotide, plays a crucial role in many physiological processes in organisms. NMN enzyme-catalyzed reactions are a series of chemical reactions that rely on specific enzymes and use NMN as the core substrate. In the process of NMN enzyme-catalyzed reactions, the addition of activators plays a key role in promoting the efficient progress of the reaction.

[0003] Existing activator addition devices typically require manual cleaning after use. Due to their complex internal structure and tightly connected components, disassembly and reassembly are extremely cumbersome, consuming significant time and manpower. Workers must carefully disassemble the device, perform thorough cleaning, and then reassemble it. During this process, even the slightest mistake can cause irreversible damage, affecting the device's lifespan and subsequent performance. Furthermore, manual cleaning cannot guarantee complete cleaning, potentially leaving some activator residue inside the device. This can interfere with subsequent NMN enzyme catalytic reactions, affecting the accuracy and stability of the results, and may also cause internal corrosion, further shortening the device's lifespan.

[0004] Therefore, it is necessary to provide a new activator addition device for NMN enzyme catalytic reaction to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides an active agent addition device for NMN enzyme catalytic reaction.

[0006] The NMN enzyme catalytic reaction activator addition device provided by this utility model includes: a reactor body, a pusher, a cleaning nozzle, a drain pipe, and a snap-fit ​​assembly. The top of the reactor body is provided with a cylinder for containing the activator. The bottom of the cylinder is connected to the top of the reactor body through a connecting pipe. A pusher for pushing the activator is installed inside the cylinder. A cleaning nozzle for cleaning the inner wall of the cylinder is installed inside the pusher. A drain pipe is slidably installed on the side wall of the reactor body near the top. A snap-fit ​​assembly is installed between the reactor body and the drain pipe. The snap-fit ​​assembly is used to fix the position of the drain pipe after it is connected to the connecting pipe at the bottom of the cylinder.

[0007] Preferably, a cylinder is fixedly connected to the top of the push plug, and a connecting rod is rotatably connected inside the cylinder. The bottom end of the connecting rod is fixedly connected to the axis of the inner wall of the cleaning nozzle. Blades are fixedly connected at equal intervals above the cleaning nozzle on the outer wall of the connecting rod. A water inlet pipe is connected to the top of the cylinder through an adapter block. A water storage tank is provided on one side of the reactor body. A pump body is fixedly connected to the top of the water storage tank and is connected to the input end of the pump body through a pipe. The output end of the pump body is connected to the other end of the water inlet pipe.

[0008] Preferably, a support frame is fixedly connected to the top of the reactor body, and an electric push rod is fixedly connected to the top of the support frame. The output end of the electric push rod passes through the support frame and is fixedly connected to the transition block at the top of the cylinder.

[0009] Preferably, a mounting component is fixedly connected to the connection between the bottom end of the cylinder and the connecting pipe. A spring is fixedly connected inside the mounting component. A valve cover is fixedly connected to the top of the spring. The top of the valve cover contacts the bottom end of the cylinder, and the area of ​​the valve cover is larger than the area of ​​the bottom outlet of the cylinder. A limit rod is fixedly connected to the axis of the mounting component. The other end of the limit rod passes through the axis of the valve cover and is slidably connected to the valve cover.

[0010] Preferably, a mounting base is fixedly connected to the side of the reactor body near the sewage pipe, and a slider is fixedly connected to the outer wall of the sewage pipe, with the slider slidably connected to the inner wall of the mounting base.

[0011] Preferably, the snap-fit ​​assembly includes: a second spring, a snap-fit ​​block, and a snap-fit ​​groove. The inner wall of the mounting base is symmetrically provided with spring grooves. The inner wall of each spring groove is fixedly connected with a second spring. The other end of the second spring is fixedly connected with a snap-fit ​​block. The outer wall of the snap-fit ​​block is slidably connected to the inner wall of the corresponding spring groove. The two sides of the slider are provided with snap-fit ​​grooves at equal intervals. The snap-fit ​​block snaps into the corresponding snap-fit ​​groove.

[0012] Preferably, a baffle is rotatably connected to the top of the inner wall of the reactor body near the sewage pipe, a sealing gasket is installed inside the end of the sewage pipe near the baffle, and the other end of the sewage pipe is connected to a sewage tank.

[0013] Preferably, a replenishment pipe is connected to the bottom of the cylinder near the mounting component, and a one-way valve is installed between the cylinder and the replenishment pipe. The other end of the replenishment pipe is connected to a replenishment box.

[0014] Compared with related technologies, the activator addition device for NMN enzyme catalytic reaction provided by this utility model has the following beneficial effects:

[0015] By integrating the plug and cleaning nozzle into a single design and facilitating easy connection between the drain pipe and the connecting pipe, cleaning can be performed without complicated disassembly and assembly. Staff can easily complete the cleaning process by following the set procedures, which greatly reduces maintenance difficulty and time costs, and reduces the risk of equipment damage caused by frequent disassembly and assembly.

[0016] After the reaction is complete, the operator only needs to manually connect the drain pipe. The entire process, from cleaning fluid delivery and nozzle start-up to cylinder cleaning and wastewater discharge, can be completed automatically. This not only saves a lot of time required for manual cleaning, but also avoids the tediousness of manual operation.

[0017] The electric push rod is activated by a preset reaction program, which precisely controls the movement of the push plug to achieve automatic quantitative addition of surfactant without manual intervention, ensuring the accuracy and stability of each addition.

[0018] The cleaning nozzle of this device, driven by an electric push rod, can clean the inner wall of the cylinder from all angles, effectively removing surfactant residues and preventing corrosion. Attached Figure Description

[0019] Figure 1 A schematic diagram of the active agent addition device for NMN enzyme catalytic reaction provided by this utility model;

[0020] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the cylinder block.

[0021] Figure 3 for Figure 2 The diagram shows the structure at point A.

[0022] Figure 4 for Figure 2 The diagram shows the structure at point B.

[0023] Figure 5 for Figure 2 The diagram shows the structure at point C.

[0024] Figure 6 for Figure 2 The diagram shows a side view of the reactor body.

[0025] The following are the labeling elements in the diagram: 1. Reactor body; 2. Cylinder; 3. Push plug; 4. Cleaning nozzle; 5. Sewage pipe; 6. Cylinder; 7. Connecting rod; 8. Blade; 9. Inlet pipe; 10. Water storage tank; 11. Pump body; 12. Support frame; 13. Electric push rod; 14. Mounting component; 15. Spring 1; 16. Valve cover; 17. Limiting rod; 18. Mounting seat; 19. Slider; 20. Spring 2; 21. Locking block; 22. Locking groove; 23. Baffle; 24. Sewage tank; 25. Replenishment pipe; 26. Replenishment box. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0028] Please see Figures 1 to 6 An active agent addition device for NMN enzyme catalytic reaction is disclosed. The device comprises: a reactor body 1, a pusher 3, a cleaning nozzle 4, a drain pipe 5, and a snap-fit ​​assembly. The top of the reactor body 1 is provided with a cylinder 2 for containing the active agent. The bottom of the cylinder 2 is connected to the top of the reactor body 1 via a connecting pipe. The pusher 3 for pushing the active agent is installed inside the cylinder 2. The cleaning nozzle 4 for cleaning the inner wall of the cylinder 2 is installed inside the pusher 3. The side wall of the reactor body 1 is close to the top. A drain pipe 5 is slidably installed at the position of the reactor body 1. A snap-fit ​​assembly is installed between the reactor body 1 and the drain pipe 5. The snap-fit ​​assembly is used to fix the position of the drain pipe 5 after it is connected to the connecting pipe at the bottom of the cylinder 2. A cylinder 6 is fixedly connected to the top of the push plug 3. A connecting rod 7 is rotatably connected inside the cylinder 6. The bottom end of the connecting rod 7 is fixedly connected to the axis of the inner wall of the cleaning nozzle 4. Blades 8 are fixedly connected at equal intervals above the cleaning nozzle 4 on the outer wall of the connecting rod 7. The top of the cylinder 6 is connected to the water inlet pipe 9 through an adapter block. The reactor body 1... A water storage tank 10 is provided on one side, and a pump body 11 is fixedly connected to the top of the water storage tank 10 and connected to the input end of the pump body 11 through a pipe. The output end of the pump body 11 is connected to the other end of the water inlet pipe 9. A support frame 12 is fixedly connected to the top of the reactor body 1, and an electric push rod 13 is fixedly connected to the top of the support frame 12. The output end of the electric push rod 13 passes through the support frame 12 and is fixedly connected to the adapter block at the top of the cylinder 6. An installation part 14 is fixedly connected to the bottom end of the cylinder 2 at the connection point with the connecting pipe. The installation part 14 is internally fixedly connected to... A spring 15 is connected to the cylinder body 2. A valve cover 16 is fixedly connected to the top of the spring 15. The top of the valve cover 16 contacts the bottom of the cylinder body 2, and the area of ​​the valve cover 16 is larger than the area of ​​the bottom outlet of the cylinder body 2. A limit rod 17 is fixedly connected to the axis of the mounting part 14. The other end of the limit rod 17 passes through the axis of the valve cover 16 and is slidably connected to the valve cover 16. A replenishment pipe 25 is connected to the bottom of the cylinder body 2 near the mounting part 14. A one-way valve is installed between the cylinder body 2 and the replenishment pipe 25. The other end of the replenishment pipe 25 is connected to the replenishment box 26.

[0029] It should be noted that the internal connection between the cleaning nozzle 4 and the push plug 3 is through a bearing, which is intended to reduce the friction of their rotation. A sealing gasket is provided at the bottom of the cylinder 2 where it contacts the valve cover 16 to ensure the sealing of the active agent inside the cylinder 2.

[0030] Please see Figure 2 and Figure 6 A mounting base 18 is fixedly connected to the side of the reactor body 1 near the sewage pipe 5. A slider 19 is fixedly connected to the outer wall of the sewage pipe 5. The slider 19 is slidably connected to the inner wall of the mounting base 18. The snap-fit ​​assembly includes: a second spring 20, a snap block 21, and a snap groove 22. Spring grooves are symmetrically opened on the inner wall of the mounting base 18. A second spring 20 is fixedly connected to the inner wall of each spring groove. A snap block 21 is fixedly connected to the other end of the second spring 20. The outer wall of the snap block 21 is slidably connected to the inner wall of the corresponding spring groove. Snap grooves 22 are equidistantly opened on both sides of the slider 19. The snap block 21 snaps into the corresponding snap groove 22. A baffle 23 is rotatably connected to the top of the inner wall of the reactor body 1 near the sewage pipe 5. A sealing gasket is installed inside the end of the sewage pipe 5 near the baffle 23. The other end of the sewage pipe 5 is connected to a sewage tank 24.

[0031] It should be noted that: when the baffle 23 is in a vertical state, it contacts the end of the drain pipe 5 near the connecting pipe, and the side of the baffle 23 near the drain pipe 5 is magnetically designed to ensure that it can be stably connected to the end of the drain pipe 5 when it is in a vertical state.

[0032] The working principle of the NMN enzyme catalytic reaction activator addition device provided by this utility model is as follows:

[0033] I. Surfactant Addition Stage

[0034] Initial preparation: Before the NMN enzyme catalytic reaction, the raw materials required for the reaction are first added into the reactor body 1, while the active agent is pre-stored in the cylinder 2. At this time, the valve cover 16 at the top of the spring-15 in the mounting part 14 at the connection between the bottom of the cylinder 2 and the connecting pipe is tightly attached to the bottom of the cylinder 2. Since the area of ​​the valve cover 16 is larger than the bottom outlet area of ​​the cylinder 2, the channel between the cylinder 2 and the connecting pipe is closed under the elastic force of the spring-15 to prevent the active agent from leaking.

[0035] Activator delivery: According to the pre-set reaction program, the electric push rod 13 is activated; the electric push rod 13 is installed on the support frame 12 at the top of the reactor body 1, and its output end is connected to the top of the cylinder 6 through an adapter block; after the electric push rod 13 is activated, the output end extends, driving the cylinder 6 to move downward; since the bottom of the cylinder 6 is fixedly connected to the push plug 3, the push plug 3 moves slowly downward inside the cylinder 2; as the push plug 3 moves downward, the activator inside the cylinder 2 is squeezed, and the pressure gradually increases;

[0036] Channel opening and quantitative delivery: When the pressure of the activator inside cylinder 2 reaches a certain level, sufficient to overcome the elastic force of spring-15, valve cover 16 is pushed by the activator, begins to compress spring-15, and moves downward along the limiting rod 17 at the axis of mounting part 14; at this time, the channel between cylinder 2 and connecting pipe is opened, and the activator squeezed by push plug 3 is quantitatively delivered into reactor body 1 under pressure through connecting pipe, mixes with the raw materials therein, participates in NMN enzyme catalytic reaction, and promotes efficient reaction;

[0037] Channel closure: When the electric push rod 13 stops working after completing the set pushing stroke, the valve cover 16 is no longer pushed by the activator; at this time, the spring 15 releases the stored elastic force, pushes the valve cover 16 to return to its original position, and tightly fits the bottom of the cylinder 2 again, sealing the channel between the cylinder 2 and the connecting pipe to prevent the activator from flowing into the reactor body 1.

[0038] II. Equipment Cleaning Stage

[0039] Drain pipe 5 connection: After the NMN enzyme catalytic reaction is completed, the cylinder 2 needs to be cleaned. First, pull the replenishment pipe 25 out of the replenishment box 26. At this time, the one-way valve at the bottom of the cylinder 2 near the mounting part 14 is in the closed state. Then, manually push the drain pipe 5. The slider 19 on the outer wall of the drain pipe 5 slides on the inner wall of the mounting seat 18 on one side of the reactor body 1. During the pushing process, the slots 22 on both sides of the slider 19 interact with the locking blocks 21 in the spring grooves on the inner wall of the mounting seat 18. The inner wall of the slots 22 squeezes the locking blocks 21, causing the locking blocks 21 to slide in the spring grooves and compress the spring 20. As slider 19 continues to move, when the adjacent slot 22 moves to the position of the block 21, the block 21 quickly engages with the slot 22 under the elastic force of spring 20, thereby fixing the position of the drain pipe 5 and ensuring accurate docking between the drain pipe 5 and the connecting pipe. During the movement of the drain pipe 5, the end near the top of the inner wall of the reactor body 1 will push up the baffle 23 rotatably connected to the top inner wall of the reactor body 1. The baffle 23 rotates around its rotation axis to make room for docking between the drain pipe 5 and the connecting pipe. At the same time, the baffle 23 can also prevent the surfactant from entering the drain pipe 5 during the surfactant addition process.

[0040] Cleaning fluid delivery and nozzle activation: After the drain pipe 5 is connected to the connecting pipe, the electric push rod 13 is activated to retract it; since the replenishment pipe 25 has been pulled out, the one-way valve installed between the cylinder 2 and the replenishment pipe 25 opens under the pressure change in the cylinder 2, and outside air enters the cylinder 2, pushing the push plug 3 to rise to the highest point; at this time, the pump body 11 at the top of the water tank 10 is activated, and the pump body 11 draws out the cleaning fluid in the water tank 10 and delivers it to the water inlet pipe 9 at the top of the cylinder 6 through the pipeline; after the cleaning fluid enters the cylinder 6, the high-speed water flow impacts the blades 8 that are fixed at equal intervals on the outer wall of the connecting rod 7, and the blades 8 are rotated around the axis of the connecting rod 7 under force, thereby driving the connecting rod 7 to rotate; since the bottom end of the connecting rod 7 is fixedly connected to the axis of the inner wall of the cleaning nozzle 4, the cleaning nozzle 4 rotates accordingly; at the same time, the impact force of the cleaning fluid causes the cleaning nozzle 4 to slide out inside the push plug 3 against friction.

[0041] Cylinder 2 cleaning and wastewater discharge: After the cleaning nozzle 4 extends, the cleaning liquid is sprayed out from its interior and cleans the inner wall of the cylinder 2 in all directions during rotation, flushing off the residual surfactant. While the cleaning nozzle 4 is working, the electric push rod 13 is activated, and its output end slowly pushes the cylinder 6 downward, causing the push plug 3 and the cleaning nozzle 4 to move downward together. As the push plug 3 moves downward, the gas and cleaning liquid in the cylinder 2 are compressed, and the pressure increases. When the pressure reaches a certain level, the valve cover 16 at the bottom of the cylinder 2 is opened again. At this time, the residual surfactant that has been cleaned off mixes with the cleaning liquid, enters the drain pipe 5 through the connecting pipe, and finally flows into the wastewater tank 24.

[0042] Equipment Reset: When the push plug 3 moves to the bottom of the cylinder 2, the cleaning work is completed, and the pump body 11 is turned off. At this time, the bottom of the cylinder 2 contacts the cleaning nozzle 4, squeezing it into the push plug 3 to reset, preparing for the next use. After standing for a period of time, when all the liquid in the connecting pipe and the drain pipe 5 has flowed into the sewage tank 24, the slider 19 is pushed in the opposite direction. During the reverse pushing process, the locking block 21 inside the mounting base 18 disengages from the current slot 22. As the slider 19 continues to move, the locking block 21 engages with the adjacent slot 22 under the action of the spring 20. At the same time, the drain pipe 5 moves in the opposite direction with the slider 19, away from the connecting pipe. After the drain pipe 5 is reset, the baffle 23 rotates to a vertical position under its own gravity and contacts the drain pipe 5 to prevent the surfactant from entering the drain pipe 5 during the addition process.

[0043] The next time you use it, insert the replenishment tube 25 into the replenishment box 26, start the electric push rod 13 to retract, and draw the active agent in the replenishment box 26 into the cylinder 2 to prepare for the NMN enzyme catalytic reaction.

[0044] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An NMN enzyme-catalyzed reaction application active agent adding device characterized by, include: The reactor body (1) has a cylinder (2) at the top for containing the active agent, and the bottom of the cylinder (2) is connected to the top of the reactor body (1) through a connecting pipe. Push plug (3), the cylinder (2) is equipped with a push plug (3) for pushing the active agent; The cleaning nozzle (4) is installed inside the push plug (3) for cleaning the inner wall of the cylinder (2); Sewage pipe (5) is slidably installed on the side wall of the reactor body (1) near the top; A snap-fit ​​assembly is installed between the reactor body (1) and the drain pipe (5). The snap-fit ​​assembly is used to fix the position of the drain pipe (5) after it is connected to the connecting pipe at the bottom of the cylinder (2).

2. The activator addition device for NMN enzyme catalytic reaction according to claim 1, characterized in that, A cylinder (6) is fixedly connected to the top of the push plug (3). A connecting rod (7) is rotatably connected inside the cylinder (6). The bottom end of the connecting rod (7) is fixedly connected to the axis of the inner wall of the cleaning nozzle (4). A blade (8) is fixedly connected at equal intervals above the cleaning nozzle (4) on the outer wall of the connecting rod (7). A water inlet pipe (9) is connected to the top of the cylinder (6) through a transition block. A water storage tank (10) is provided on one side of the reactor body (1). A pump body (11) is fixedly connected to the top of the water storage tank (10) and is connected to the input end of the pump body (11) through a pipe. The output end of the pump body (11) is connected to the other end of the water inlet pipe (9).

3. The activator addition device for NMN enzyme catalytic reaction according to claim 2, characterized in that, A support frame (12) is fixedly connected to the top of the reactor body (1), and an electric push rod (13) is fixedly connected to the top of the support frame (12). The output end of the electric push rod (13) passes through the support frame (12) and is fixedly connected to the transition block at the top of the cylinder (6).

4. The activator addition device for NMN enzyme catalytic reaction according to claim 1, characterized in that, A mounting component (14) is fixedly connected to the bottom end of the cylinder (2) and the connection point of the connecting pipe. A spring (15) is fixedly connected inside the mounting component (14). A valve cover (16) is fixedly connected to the top of the spring (15). The top of the valve cover (16) contacts the bottom end of the cylinder (2), and the area of ​​the valve cover (16) is larger than the area of ​​the bottom outlet of the cylinder (2). A limit rod (17) is fixedly connected to the axis of the mounting component (14). The other end of the limit rod (17) passes through the axis of the valve cover (16) and slides with the valve cover (16).

5. The activator addition device for NMN enzyme catalytic reaction according to claim 1, characterized in that, A mounting base (18) is fixedly connected to the side of the reactor body (1) near the drain pipe (5). A slider (19) is fixedly connected to the outer wall of the drain pipe (5). The slider (19) is slidably connected to the inner wall of the mounting base (18).

6. The activator addition device for NMN enzyme catalytic reaction according to claim 5, characterized in that, The snap-fit ​​assembly includes: spring two (20), snap-fit ​​block (21) and snap-fit ​​groove (22). The inner wall of the mounting base (18) is symmetrically provided with spring grooves. Spring two (20) is fixedly connected to the inner wall of each spring groove. Snap-fit ​​block (21) is fixedly connected to the other end of spring two (20). The outer wall of snap-fit ​​block (21) is slidably connected to the inner wall of the corresponding spring groove. Snap-fit ​​grooves (22) are provided at equal intervals on both sides of the slider (19). Snap-fit ​​block (21) snaps into the corresponding snap-fit ​​groove (22).

7. The activator addition device for NMN enzyme catalytic reaction according to claim 5, characterized in that, A baffle (23) is rotatably connected to the top of the inner wall of the reactor body (1) near the drain pipe (5). A sealing gasket is installed inside one end of the drain pipe (5) near the baffle (23), and the other end of the drain pipe (5) is connected to a sewage tank (24).

8. The activator addition device for NMN enzyme catalytic reaction according to claim 1, characterized in that, A replenishment pipe (25) is connected to the bottom of the cylinder (2) near the mounting part (14), and a one-way valve is installed between the cylinder (2) and the replenishment pipe (25). The other end of the replenishment pipe (25) is connected to the replenishment box (26).