A top-mounted magnetic stirring nylon polymerization column
By using the magnetic coupling and isolation sleeve design of the top-mounted magnetic stirrer, the problems of stirring shaft leakage and material sticking to the wall in the nylon polymerization reaction are solved, achieving efficient material mixing and heat transfer, and improving product quality and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHONGLUN PLASTIC IND FUJIAN
- Filing Date
- 2025-09-02
- Publication Date
- 2026-08-04
AI Technical Summary
During the polymerization reaction of nylon, the stirring shaft is prone to leakage through the mechanical seal structure at the top of the tower, which leads to the leakage of volatile components in the reaction system and the introduction of external impurities. Furthermore, the problems of material sticking to the wall and carbonization blockage are difficult to solve, affecting product purity and production efficiency.
It adopts a top-mounted magnetic stirrer, which transmits power through the magnetic coupling of the outer rotor and the inner rotor. Combined with carbon fiber or PEEK isolation sleeves and stepped groove structure, it isolates the inner and outer spaces of the tower body to avoid mechanical seal leakage, and reduces material sticking to the wall and carbonization through strong shearing and circulation.
It effectively prevents material leakage and wall adhesion, improves product purity, reduces carbonization blockage, enhances devolatilization efficiency, and improves product stability and production efficiency.
Smart Images
Figure CN224585922U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of polymerization tower technology, and in particular to a top-mounted magnetic stirring nylon polymerization tower. Background Technology
[0002] During the polymerization of nylon, especially in the post-polymerization stage of nylon 6, the uniform mixing of materials and heat transfer efficiency directly affect the molecular weight distribution and mechanical properties of the product. To increase the heat exchange area, traditional polymerization towers often have stirring devices in the upper section, allowing the materials to undergo static mixing within the tower and resulting in a more uniform reaction temperature.
[0003] However, the stirring shaft of the stirring device extends into the reactor through the mechanical seal structure at the top of the tower. The mechanical seal is prone to leakage. Under the high temperature and high pressure reaction environment, the aging rate of the seal is accelerated, which may not only cause leakage of volatile components in the reaction system, but also introduce external impurities and affect the purity of the product.
[0004] Meanwhile, as the polymer viscosity increases and its fluidity decreases in the later stages, local overheating can occur, making it easy for materials to stick to the walls. The materials sticking to the walls will carbonize at high temperatures, which not only wastes raw materials but may also block the discharge port at the bottom of the tower and related pipelines, increasing the difficulty of equipment cleaning and maintenance costs. In addition, the low-molecular-weight volatiles produced by the reaction are also difficult to remove, resulting in low volatilization efficiency and affecting product quality.
[0005] To address leakage issues, some polymerization towers have adopted methods such as adding sealing layers. However, this undoubtedly increases the complexity and manufacturing cost of the equipment, and still cannot fundamentally eliminate the risk of leakage. As for the problems of material sticking to the walls and carbonization clogging, existing technologies mostly improve the situation by optimizing the stirring speed or adding wall scraping devices. However, the mechanical contact between the wall scraping device and the tower body can bring new wear and leakage risks, and it is also difficult to adapt to the dynamic changes in the state of the material during the polymerization reaction.
[0006] Therefore, how to effectively reduce material sticking to the wall and carbonization blockage while avoiding increasing leakage points remains a key technical challenge for improving the performance of nylon polymerization reaction equipment. Utility Model Content
[0007] To address the technical problem of effectively reducing material adhesion and carbonization blockage without increasing leakage points, this utility model provides a top-mounted magnetically stirred nylon polymerization tower, including a tower body and a magnetic stirrer. The tower body includes a welded integral cylinder, an upper end cap, and a lower end cap, wherein the upper end cap is provided with a flange interface at its center; The magnetic stirrer includes a drive motor, bearing housing, outer rotor, inner rotor, isolation sleeve, stirring shaft, and stirring paddle; The lower part of the bearing housing is sealed and assembled with the flange interface, and the upper part is equipped with the drive motor; The outer rotor is provided at the output end of the drive motor and extends into the bearing housing; The inner rotor is located inside the bearing housing and is magnetically coupled to the outer rotor. The isolation sleeve is installed between the outer rotor and the inner rotor, and isolates the inner and outer spaces of the tower body; The upper part of the stirring shaft is connected to the inner rotor, and the lower part is connected to the stirring paddle.
[0008] In one embodiment, the outer rotor and the inner rotor are at the same horizontal height.
[0009] In one embodiment, the magnetic stirrer further includes a speed reducer, and the output end of the drive motor is connected to the speed reducer and then connected to the outer rotor.
[0010] Furthermore, the reducer is a planetary gear reducer with a reduction ratio of 1:(5~10).
[0011] In one embodiment, the impeller includes at least two stages of impeller blade assembly.
[0012] Furthermore, the stirring paddle includes a central shaft and blades; the number of blades in any first-stage stirring paddle assembly is 3 to 6.
[0013] Furthermore, the blade is a rectangular flat blade, perpendicular to the central axis, and forms an angle of 45° to 60° with the central axis; the blade length is 25% to 30% of the nominal diameter of the tower body.
[0014] In one embodiment, the isolation sleeve is a carbon fiber isolation sleeve or a PEEK isolation sleeve.
[0015] In one embodiment, the isolation sleeve has a stepped groove structure, with the stepped portion fitting into the bearing seat.
[0016] In one embodiment, a PEEK sealing gasket is provided between the flange interface and the bearing housing.
[0017] Compared with the prior art, the utility model has the following beneficial effects: The top-mounted magnetic stirring nylon polymerization tower provided by this utility model transmits power through the magnetic coupling of the outer rotor and the inner rotor, replacing the shaft seal structure of the traditional mechanical stirring. It is equipped with a carbon fiber or PEEK isolation sleeve between the outer rotor and the inner rotor. The isolation sleeve is specially designed with a stepped groove structure, which can fit tightly with the bearing seat to achieve effective isolation between the inner and outer spaces of the tower. While avoiding the increase of leakage points, it effectively reduces the frequency of material sticking to the wall and carbonization blockage.
[0018] In addition, the top-mounted magnetic stirring nylon polymerization tower adopts a welded integrated cylinder, upper head and lower head, and a PEEK sealing gasket is set between the flange interface and the bearing seat to further enhance the overall sealing performance of the equipment. This can prevent the leakage of volatile components in the reaction system and avoid the introduction of external impurities, thus ensuring the purity of the product.
[0019] In summary, the top-mounted magnetic stirring nylon polymerization tower, while avoiding leakage, not only solves the problem of material carbonization caused by local overheating due to high viscosity and prolonged adhesion to the wall, reducing the blockage of the outlet and pipeline by carbonized material, but also reduces the impact of water molecules or low molecular weight polymers generated in the reaction due to bubbles encapsulated by high viscosity melt through the strong shearing and circulation of the stirrer, thus improving the devolatilization efficiency and enhancing the overall product stability and production efficiency. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a cross-sectional view of the top-mounted magnetic stirring nylon polymerization tower provided in Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the magnetic stirrer structure provided in Embodiment 1 of this utility model; Figure 3 This is an enlarged view of section A of the magnetic stirrer provided in Embodiment 1 of this utility model.
[0022] Figure label: 100-Tower body; 110-Cylinder body; 120-Upper head; 121-Flange interface; 130-Lower head; 200-Magnetic stirrer; 210-Drive motor; 220-Bearing housing; 231-Outer rotor; 232-Inner rotor; 233-Isolation sleeve; 240-Stirring shaft; 250-Stirring paddle; 251-Central shaft; 252-Paddle blade; 260-Reducer. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0024] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "center", "one end", "both ends", "bottom end", "one side", "lower edge", "upper part", "lower part", "middle section", "vertical", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0025] Example 1 This embodiment provides a top-mounted magnetically stirred nylon polymerization tower, see reference. Figure 1 As shown, it includes a tower body 100 and a magnetic stirrer 200.
[0026] The tower body 100 includes a welded integral cylinder 110, an upper end cap 120, and a lower end cap 130, which has high overall strength and good sealing performance, and can effectively prevent material leakage. The upper end cap 120 has a flange interface 121 at its center, which provides a stable and standard connection point for the installation of subsequent components.
[0027] See Figure 2 As shown, the magnetic stirrer 200 includes a drive motor 210, a bearing housing 220, an outer rotor 231, an inner rotor 232, an isolation sleeve 233, a stirring shaft 240, and a stirring paddle 250; The lower part of the bearing housing 220 is sealed and assembled with the flange interface 121, and the upper part is equipped with a drive motor 210 to provide power for the entire mixing system. See Figure 3 As shown, the output end of the drive motor 210 is provided with an outer rotor 231 that extends into the bearing housing 220. The inner rotor 232 is located inside the bearing housing 220 and is magnetically coupled to the outer rotor 231. Furthermore, the outer rotor 231 and the inner rotor 232 are at the same horizontal height to ensure better magnetic coupling between the two, guarantee the stability and efficiency of power transmission, and reduce energy loss. The isolation sleeve 233 is disposed between the outer rotor 231 and the inner rotor 232, and isolates the inner and outer spaces of the tower body 100. In this embodiment, preferably, the isolation sleeve 233 is a PEEK isolation sleeve and adopts a stepped groove structure, which can be tightly fitted with the bearing seat 220, effectively isolating the environment inside and outside the tower body 100, preventing external media from entering the vessel, and ensuring the effective transmission of magnetic force. The upper part of the stirring shaft 240 is connected to the inner rotor 232, and the lower part is connected to the stirring paddle 250, thereby transmitting the power of the drive motor 210 to the stirring paddle 250 through the outer rotor 231 and the inner rotor 232 to achieve stirring of the material in the tower body 100.
[0028] In this embodiment, more preferably, the magnetic stirrer 200 also includes a reducer 260, and the output end of the drive motor 210 is connected to the reducer 260 and then connected to the outer rotor 231. In practical use, the output speed of the drive motor 210 can be adjusted by setting the reducer 260 according to the actual reaction requirements, so that the speed of the agitator 250 is more in line with the requirements of the nylon polymerization reaction. Among them, the reducer 260 is a planetary gear reducer with a reduction ratio of 1:(5-10).
[0029] In this embodiment, more preferably, the stirring paddle 250 includes a two-stage stirring blade assembly, which can uniformly mix the materials in the tower body 100 during the nylon polymerization reaction, effectively promoting the reaction. Furthermore, the agitator 250 includes a central shaft 251 and blades 252, and the number of blades 252 in any first-stage agitator blade group is 3. Furthermore, the blade 252 is a rectangular flat blade, set perpendicular to the central axis 251, and forms an angle of 60° with the axis of the central axis 251. The length of the blade 252 is 25% of the nominal diameter of the tower body (100). In practical use, the blade 252 with the above-designed dimensions can generate sufficient stirring force and appropriate stirring flow field during the stirring process. It can fully stir the material without damaging the tower body 100 due to excessive stirring force, while ensuring the uniformity and efficiency of stirring.
[0030] In this embodiment, more preferably, a PEEK sealing gasket is provided between the flange interface 121 and the bearing housing 220, which further enhances the sealing performance of the connection and effectively prevents leakage and contamination.
[0031] The method of using the top-mounted magnetically stirred nylon polymerization tower of this utility model is as follows: After the equipment is checked for sealing, the material is added into the tower body 100, and the loading amount should be 1 / 3 to 2 / 3 of the volume of the tower body 100. The drive motor 210 is started, which drives the outer rotor 231 to rotate. The outer rotor 231 drives the inner rotor 232 to rotate synchronously through magnetic coupling. The inner rotor 232 then drives the stirring shaft 240 and the stirring paddle 250 to stir the material in the tower body 100. After the reaction is completed, the drive motor 210 is stopped first, and then the reacted material is discharged from the tower body 100 through the corresponding discharge port. Finally, the polymerization tower is cleaned and maintained.
[0032] The above description is only a preferred embodiment of the present utility model and should not be used to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
[0033] Although this document frequently uses terms such as tower body, cylinder, upper head, lower head, flange interface, magnetic stirrer, drive motor, bearing housing, outer rotor, inner rotor, isolation sleeve, stirring shaft, stirring paddle, central shaft, blade, reducer, stirring blade assembly, length dimension, nominal diameter, horizontal height, reduction ratio, included angle of axis, carbon fiber, PEEK, planetary gear reducer, rectangular flat blade, top-mounted magnetic stirring nylon polymerization tower, two-stage stirring blade assembly, welded as one piece, sealed assembly, magnetic coupling, isolation, and connection, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.
[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. An overhead magnetic stir nylon polymerization column characterized by: Includes a tower body (100) and a magnetic stirrer (200); The tower body (100) includes a welded integral cylinder (110), an upper end cap (120) and a lower end cap (130), wherein the upper end cap (120) is provided with a flange interface (121) at its center. The magnetic stirrer (200) includes a drive motor (210), a bearing housing (220), an outer rotor (231), an inner rotor (232), an isolation sleeve (233), a stirring shaft (240), and a stirring paddle (250). The lower part of the bearing housing (220) is sealed and assembled with the flange interface (121), and the upper part is provided with the drive motor (210). The output end of the drive motor (210) is provided with the outer rotor (231), which extends into the bearing housing (220); The inner rotor (232) is located inside the bearing housing (220) and is magnetically coupled to the outer rotor (231); The isolation sleeve (233) is disposed between the outer rotor (231) and the inner rotor (232) and isolates the inner and outer spaces of the tower body (100); The upper part of the stirring shaft (240) is connected to the inner rotor (232), and the lower part is connected to the stirring paddle (250).
2. The overhead magnetic-stirred nylon polymerization column of claim 1, wherein: The outer rotor (231) and the inner rotor (232) are at the same horizontal level.
3. The overhead magnetic-stirred nylon polymerization column of claim 1, wherein: The magnetic stirrer (200) also includes a speed reducer (260). The output end of the drive motor (210) is connected to the speed reducer (260) and then connected to the outer rotor (231).
4. The overhead magnetic-stirred nylon polymerization column of claim 3, wherein: The reducer (260) is a planetary gear reducer with a reduction ratio of 1:(5~10).
5. The overhead magnetic-stirred nylon polymerization column of claim 1, wherein: The agitator (250) includes at least two stages of agitator blade assembly.
6. The overhead magnetic-stirred nylon polymerization column of claim 5, wherein: The stirring paddle (250) includes a central shaft (251) and blades (252); the number of blades (252) in any one-stage stirring paddle group is 3 to 6.
7. The overhead magnetic-stirred nylon polymerization column of claim 6, wherein: The blade (252) is a rectangular flat blade, which is set perpendicular to the central axis (251) and forms an angle of 45° to 60° with the axis of the central axis (251); the length of the blade (252) is 25% to 30% of the nominal diameter of the tower body (100).
8. The overhead magnetic-stirred nylon polymerization column of claim 1, wherein: The isolation sleeve (233) is a carbon fiber isolation sleeve or a PEEK isolation sleeve.
9. The overhead magnetic-stirred nylon polymerization column of claim 1, wherein: The isolation sleeve (233) has a stepped groove structure, and the stepped part is fitted into the bearing seat (220).
10. The overhead magnetic-stirred nylon polymerization column of claim 1, wherein: A PEEK sealing gasket is provided between the flange interface (121) and the bearing housing (220).