A magnetically coupled rotary seal device for an internal mixer
By using a magnetic coupling rotary sealing device, a combination of permanent magnets and bearing materials is used to achieve contactless transmission in the internal mixer, solving the problems of high cost and leakage under mechanical sealing, and improving the stability and environmental friendliness of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- QILU UNIVERSITY OF TECHNOLOGY (SHANDONG ACADEMY OF SCIENCES)
- Filing Date
- 2026-03-12
- Publication Date
- 2026-06-30
AI Technical Summary
The mechanical seals of existing internal mixers require frequent lubricant changes, resulting in high operating costs, heavy maintenance burdens, and the risk of material leakage.
A magnetic coupling rotary sealing device is adopted, which transmits kinetic energy through magnetic field coupling between the driving shaft and the driven shaft, realizing contactless transmission and eliminating dependence on lubricating oil. The combination of permanent magnets and bearing materials ensures that the material is sealed in a static isolation cover.
It reduces maintenance costs, improves the stability and environmental friendliness of equipment operation, completely eliminates the risk of material leakage, and enhances the operational reliability of the equipment.
Smart Images
Figure CN122305231A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of internal mixer technology, specifically to a magnetically coupled rotary sealing device for an internal mixer. Background Technology
[0002] As a core mixing equipment in the rubber and plastics industry, the internal mixer's performance directly affects the material dispersion uniformity, production efficiency, and energy consumption level. In traditional internal mixers, the rotor is connected to the reducer via a coupling and passes through the mixing chamber and the mixer's outer shell. During the mixing process, there is relative movement between the rotor and the mixing chamber and the mixer's outer shell. To prevent material leakage along the axial direction, mechanical seals need to be installed at the appropriate locations.
[0003] In existing internal mixers, mechanical seals are used as the main way to prevent material leakage at the transmission end. The dynamic and static rings rely on lubricating oil to reduce wear and maintain the sealing effect. However, the lubricating oil is easily contaminated by the material and cannot be reused. It needs to be replaced frequently, resulting in high operating costs and heavy maintenance burden. There is also a risk of material leakage to the coupling side. To address this, we have introduced a magnetic coupling rotary seal device for internal mixers. Summary of the Invention
[0004] The purpose of this invention is to provide a magnetically coupled rotary sealing device for an internal mixer to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: A magnetic coupling rotary sealing device for an internal mixer includes a mounting ring, a driven rotary mechanism movably connected to the inner side of the mounting ring, a first sealing shell provided on the outer side of the driven rotary mechanism, one end of the first sealing shell being mounted to the outer side of the mounting ring by a plurality of first screws, a plurality of first connecting mechanisms provided inside the first sealing shell, and a first connecting pipe fixedly connected inside the first sealing shell, the lower end of the first connecting pipe being tapered. A second sealing shell is provided on the outside of the first sealing shell. The second sealing shell is installed on the outside of the mounting ring by a number of second screws. A number of positioning through holes are opened inside the second sealing shell. A square positioning rod is inserted into the positioning through holes. One end of the square positioning rod is fixedly connected to the mounting ring. A screw is fixedly connected to the end of the square positioning rod away from the mounting ring. A nut is screwed to the outside of the screw. The end of the screw away from the square positioning rod is inclined. A connecting hole is opened on the outside of the square positioning rod. The second sealed housing is provided with an active rotating mechanism, which drives the driven rotating mechanism to rotate. The second sealed housing is provided with several second connecting mechanisms and an exhaust dust collection mechanism. The upper end of the exhaust dust collection mechanism is connected to the first connecting pipe.
[0006] Preferably, the first connecting mechanism includes a cross-shaped connecting tube, which is slidably connected to the sliding cavity. The upper and lower ends of the cross-shaped connecting tube extend out of the first sealing shell. A support spring is sleeved on the outside of the cross-shaped connecting tube. One end of the support spring is fixedly connected to the cross-shaped connecting tube, and the other end is fixedly connected to the sliding cavity.
[0007] Preferably, the driven rotation mechanism includes a driven shaft, a first cylindrical permanent magnet is fixedly connected to the outside of the driven shaft, a first disc permanent magnet is fixedly connected to the end of the driven shaft away from the mounting ring, a bearing is connected to the outside of the driven shaft, the outside of the bearing is connected to the inside of the mounting ring, and a plurality of sealing rings are sleeved on the outside of the driven shaft.
[0008] Preferably, the active rotation mechanism includes an active shaft, which is movably connected to the second sealed housing. One end of the active shaft extends into the external environment, and the other end has a groove. A second cylindrical permanent magnet and a second disc permanent magnet are fixedly connected in the groove.
[0009] Preferably, the second connecting mechanism includes a second connecting pipe and a cross-shaped connecting block. The second connecting pipe is fixedly connected to the second sealing housing. The upper end of the second connecting pipe is connected to the positioning through hole, and the lower end of the second connecting pipe is tapered.
[0010] Preferably, the cross-shaped connecting block is slidably connected to the connecting cavity, which is located inside the second sealing shell. A limiting spring is sleeved on the outside of the cross-shaped connecting block. One end of the limiting spring is fixedly connected to the cross-shaped connecting block, and the other end is fixedly connected to the connecting cavity. A curved connecting hole is provided inside the cross-shaped connecting block.
[0011] Preferably, a sealing ring is fixedly connected to one end of the mounting ring, and a plurality of mounting screws are provided on the outer side of the mounting ring.
[0012] Preferably, the exhaust dust collection mechanism includes a movable tube, which is movably connected to the second sealed housing. The lower end of the movable tube extends into the external environment and is connected to the dust collection bag. A return spring is sleeved on the outside of the movable tube. One end of the return spring is fixedly connected to the inside of the second sealed housing, and the other end is fixedly connected to the movable tube.
[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention drives the second disc permanent magnet and the second cylindrical permanent magnet to rotate through the drive shaft. Under the action of magnetic field coupling, the kinetic energy transmitted by the drive shaft is transferred across the medium in the form of magnetic energy to the first cylindrical permanent magnet and the first disc permanent magnet. The rotation of the first disc permanent magnet and the first cylindrical permanent magnet drives the driven shaft to rotate, and the rotation of the driven shaft drives the rotor connected to it to rotate, realizing magnetic coupling contactless transmission. By encapsulating the driven shaft in the first sealing shell and the second sealing shell, the material is sealed in the static isolation cover, preventing material leakage to one side, completely eliminating the use of lubricating oil at the rotor drive end, thereby reducing maintenance costs and improving the stability and environmental friendliness of the equipment operation. Attached Figure Description
[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the sealing ring position of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention in its decomposed state; Figure 4 This is a three-dimensional cross-sectional view of the present invention; Figure 5 This is a three-dimensional cross-sectional view of the second sealing shell of the present invention; Figure 6 This is a three-dimensional structural diagram of the cross-shaped connecting block of the present invention in its non-extended state; Figure 7 This is a partially enlarged structural diagram of the cross-shaped connecting block, the second connecting pipe, and the connection relationship between the cross-shaped connecting pipes of the present invention; Figure 8 This is a three-dimensional cross-sectional view of the first sealing shell of the present invention; Figure 9 This is a three-dimensional cross-sectional view of the driven shaft of the present invention; Figure 10 This is a three-dimensional sectional view of the active shaft structure of the present invention; Figure 11 This is a schematic diagram of the installation state structure of the present invention.
[0015] In the diagram: 1. Mounting ring; 2. Sealing ring; 3. Driven shaft; 4. Mounting screw; 5. Drive shaft; 6. Second sealing housing; 7. Groove; 8. Second screw; 9. Cross-shaped connecting block; 10. Bearing; 11. Square positioning rod; 12. Cross-shaped connecting tube; 13. First connecting tube; 14. Dust collection bag; 15. Second cylindrical permanent magnet; 16. First disc permanent magnet; 17. Second disc permanent magnet; 18. First sealing housing; 19. First cylindrical permanent magnet; 20. Nut; 21. Screw; 22. Connecting hole; 23. Second connecting tube; 24. Movable tube; 25. Return spring; 26. Mixing box; 27. Reducer; 28. Limit spring; 29. Connecting cavity; 30. Curved connecting hole; 31. First screw; 32. Sealing ring; 33. Sliding cavity; 34. Support spring; 35. Positioning through hole; 36. Motor. Detailed Implementation
[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0017] Please see Figures 1-11 The present invention provides a technical solution: Example 1: A magnetic coupling rotary sealing device for an internal mixer includes a mounting ring 1, with a sealing ring 2 fixedly connected to one end of the mounting ring 1. The sealing ring 2 achieves a sealing effect between the sealing ring 2 and the internal mixer box 26. Several mounting screws 4 are provided on the outer side of the mounting ring 1, which can be used to install the mounting ring 1 and the internal mixer box 26 together. A driven rotating mechanism is movably connected to the inner side of the mounting ring 1. A first sealing shell 18 is provided on the outer side of the driven rotating mechanism. One end of the first sealing shell 18 is installed on the outer side of the mounting ring 1 by several first screws 31, which seal the driven rotating mechanism. Several first connecting mechanisms are provided inside the first sealing shell 18. A first connecting pipe 13 is fixedly connected inside the first sealing shell 18, and the lower end of the first connecting pipe 13 is tapered.
[0018] A second sealing shell 6 is provided on the outside of the first sealing shell 18. The second sealing shell 6 is installed on the outside of the mounting ring 1 by a number of second screws 8. The first sealing shell 18 is sealed by the second sealing shell 6. A number of positioning through holes 35 are opened inside the second sealing shell 6. A square positioning rod 11 is inserted into the positioning through holes 35. One end of the square positioning rod 11 is fixedly connected to the mounting ring 1. The square positioning rod 11 moves along the positioning through holes 35 to guide and position the second sealing shell 6. A screw 21 is fixedly connected to the end of the square positioning rod 11 away from the mounting ring 1. A nut 20 is screwed to the outside of the screw 21. The end of the screw 21 away from the square positioning rod 11 is set at an angle. A connecting hole 22 is opened on the outside of the square positioning rod 11. When the second sealing shell 6 is moved to the final position, the second sealing shell 6 can be limited and fixed by screwing the nut 20 and the screw 21 together and tightening it.
[0019] The second sealing housing 6 is equipped with an active rotating mechanism that drives the driven rotating mechanism to rotate. The second sealing housing 6 is also equipped with several second connecting mechanisms and an exhaust dust collection mechanism. The upper end of the exhaust dust collection mechanism is connected to the first connecting pipe 13. The exhaust dust collection mechanism can discharge the gas entering the first sealing housing 18, thereby dissipating heat from the first sealing housing 18. At the same time, when the sealing effect of the sealing ring 32 decreases, causing dust particles to enter the inside of the first sealing housing 18, the exhaust dust collection mechanism also filters the particles carried in the discharged gas. By observing the number of particles filtered in the exhaust dust collection mechanism, the sealing effect of the sealing ring 32 can be determined.
[0020] Example 2: Based on Embodiment 1, in order to allow external gas to enter the first sealing shell 18, the first connecting mechanism includes a cross-shaped connecting tube 12, which is slidably connected in the sliding cavity 33. Both the upper and lower ends of the cross-shaped connecting tube 12 extend out of the first sealing shell 18. A support spring 34 is sleeved on the outside of the cross-shaped connecting tube 12. One end of the support spring 34 is fixedly connected to the cross-shaped connecting tube 12, and the other end is fixedly connected to the sliding cavity 33. The upper end of the cross-shaped connecting tube 12 is tapered. After the second sealing shell 6 is installed, the second connecting tube 23 will move to the upper end of the cross-shaped connecting tube 12. Under the elastic force of the support spring 34, the cross-shaped connecting tube 12 will move upward, and the second connecting tube 23 and the cross-shaped connecting tube 12 will be engaged together.
[0021] The driven rotating mechanism includes a driven shaft 3, with a first cylindrical permanent magnet 19 fixedly connected to the outside of the driven shaft 3. A first disc-type permanent magnet 16 is fixedly connected to the end of the driven shaft 3 away from the mounting ring 1. A bearing 10 is connected to the outside of the driven shaft 3, and the outside of the bearing 10 is connected to the inside of the mounting ring 1. The bearing 10 can adapt to the high axial load during the operation of the internal mixer. The material of the bearing 10 is carburized high-temperature bearing steel. After carburizing treatment, the surface produces dispersed carbides and high residual stress, which has high hardness, high wear resistance, and high chromium content, which can form a "chromium oxide passivation film", which has high corrosion resistance and meets the working environment requirements of the internal mixer. Several sealing rings 32 are sleeved on the outside of the driven shaft 3. The sealing rings 32 are made of fluororubber material, which has good high temperature resistance and achieves good axial sealing.
[0022] The active rotation mechanism includes an active shaft 5, which is movably connected to the second sealed housing 6. One end of the active shaft 5 extends into the external environment, and the other end has a groove 7. A second cylindrical permanent magnet 15 and a second disc permanent magnet 17 are fixedly connected in the groove 7. The second connecting mechanism includes a second connecting tube 23 and a cross-shaped connecting block 9. The second connecting tube 23 is fixedly connected to the second sealed housing 6. The upper end of the second connecting tube 23 is connected to the positioning through hole 35, and the lower end of the second connecting tube 23 is tapered.
[0023] The cross-shaped connecting block 9 slides into the connecting cavity 29, which is located inside the second sealing shell 6. A limiting spring 28 is sleeved on the outside of the cross-shaped connecting block 9. One end of the limiting spring 28 is fixedly connected to the cross-shaped connecting block 9, and the other end is fixedly connected to the connecting cavity 29. In the uninstalled state, the limiting spring 28 will push the cross-shaped connecting block 9 into the connecting cavity 29 to prevent external debris from blocking the curved connecting hole 30, thus preventing the gas generated by the external gas supply equipment from flowing into the curved connecting hole 30. The cross-shaped connecting block 9 has a curved connecting hole 30. Since one end of the screw 21 is inclined, the screw 21 will push the cross-shaped connecting block 9 upward when it moves along the positioning through hole 35. At this time, the limiting spring 28 is compressed. After the cross-shaped connecting block 9 moves upward, the curved connecting hole 30 is connected to the external environment. After the second sealing shell 6 is installed, the curved connecting hole 30 is connected to the second connecting pipe 23.
[0024] The exhaust dust collection mechanism includes a movable pipe 24, the upper end of which is tapered. The movable pipe 24 is movably connected to the second sealing housing 6, and the lower end of the movable pipe 24 extends into the external environment and is connected to the dust collection bag 14. A return spring 25 is sleeved on the outside of the movable pipe 24. One end of the return spring 25 is fixedly connected to the inside of the second sealing housing 6, and the other end is fixedly connected to the movable pipe 24.
[0025] Working principle: During use, the mounting ring 1 is connected to the mixing chamber 26 of the internal mixer via several mounting screws 4. At the same time, the driven shaft 3 is connected to the stirring shaft inside the mixing chamber 26. After the mounting ring 1 is installed, the first sealing shell 18 is installed together with the mounting ring 1 via the first screw 31. The several positioning through holes 35 inside the second sealing shell 6 are aligned with the several square positioning rods 11 on the outside of the mounting ring 1. The square positioning rods 11 move along the positioning through holes 35 to achieve rapid positioning of the second sealing shell 6. This prevents the second sealing shell 6 from being difficult to install in the correct position due to the interaction between the first cylindrical permanent magnet 19 and the second cylindrical permanent magnet 15 during the installation process. During the installation of the second sealing housing 6, since the lower end of the second connecting pipe 23 is tapered, when the second sealing housing 6 moves the second connecting pipe 23, the second connecting pipe 23 will squeeze the cross-shaped connecting pipe 12, causing the cross-shaped connecting pipe 12 to move along the connecting cavity 29. At this time, the limiting spring 28 will be compressed. After the second sealing housing 6 is installed, the second connecting pipe 23 will move to the upper end of the cross-shaped connecting pipe 12. Under the elastic force of the supporting spring 34, the cross-shaped connecting pipe 12 will move upward, and at this time the second connecting pipe 23 and the cross-shaped connecting pipe 12 will be engaged together. Meanwhile, since the lower end of the first connecting tube 13 is tapered, it will squeeze the movable tube 24 when the first connecting tube 13 moves. When the first connecting tube 13 moves to the upper end of the movable tube 24, the first connecting tube 13 and the movable tube 24 are engaged together under the elastic force of the return spring 25. Since one end of the screw 21 is inclined, the screw 21 will push the cross-shaped connecting block 9 upward when it moves along the positioning through hole 35. At this time, the limit spring 28 is compressed. After the cross-shaped connecting block 9 moves upward, the curved connecting hole 30 is connected to the external environment. After the second sealing shell 6 is installed, the curved connecting hole 30 is connected to the second connecting tube 23. The motor 36 rotates through the reducer 27, which drives the drive shaft 5 located inside the second sealed housing 6 to rotate. The drive shaft 5 drives the second disc permanent magnet 17 and the second cylindrical permanent magnet 15 to rotate. Under the action of magnetic field coupling, the kinetic energy transmitted by the drive shaft 5 is transmitted across the medium in the form of magnetic energy to the first cylindrical permanent magnet 19 and the first disc permanent magnet 16. The rotation of the first disc permanent magnet 16 and the first cylindrical permanent magnet 19 drives the driven shaft 3 to rotate. The rotation of the driven shaft 3 drives the rotor connected to it to rotate, thereby realizing the stirring of materials. The gas supply device is connected to the curved connection hole 30. Gas enters the second connecting pipe 23 through the curved connection hole 30, and then enters the cross-shaped connecting pipe 12 from the second connecting pipe 23. After that, the gas enters the first sealing shell 18. The gas flowing in the first sealing shell 18 can dissipate heat on the inside of the first sealing shell 18. At the same time, when the sealing effect of the sealing ring 32 is poor, the flowing gas can carry the dust that has entered the first sealing shell 18 into the first connecting pipe 13, and finally into the dust collection bag 14 for storage. The operator can judge the strength of the sealing effect of the sealing ring 32 by observing the dust collection in the dust collection bag 14.
[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A magnetically coupled rotary sealing device for an internal mixer, comprising a mounting ring, characterized in that: The inner side of the mounting ring is movably connected to a driven rotating mechanism, and the outer side of the driven rotating mechanism is provided with a first sealing shell. One end of the first sealing shell is installed on the outer side of the mounting ring by a plurality of first screws. The first sealing shell is provided with a plurality of first connecting mechanisms, and a first connecting tube is fixedly connected inside the first sealing shell. The lower end of the first connecting tube is tapered. A second sealing shell is provided on the outside of the first sealing shell. The second sealing shell is installed on the outside of the mounting ring by a number of second screws. A number of positioning through holes are opened inside the second sealing shell. A square positioning rod is inserted into the positioning through holes. One end of the square positioning rod is fixedly connected to the mounting ring. A screw is fixedly connected to the end of the square positioning rod away from the mounting ring. A nut is screwed to the outside of the screw. The end of the screw away from the square positioning rod is inclined. A connecting hole is opened on the outside of the square positioning rod. The second sealed housing is provided with an active rotating mechanism, which drives the driven rotating mechanism to rotate. The second sealed housing is provided with several second connecting mechanisms and an exhaust dust collection mechanism. The upper end of the exhaust dust collection mechanism is connected to the first connecting pipe.
2. The magnetically coupled rotary sealing device for an internal mixer according to claim 1, characterized in that: The first connecting mechanism includes a cross-shaped connecting tube, which is slidably connected to the sliding cavity. Both the upper and lower ends of the cross-shaped connecting tube extend out of the first sealing shell. A support spring is sleeved on the outside of the cross-shaped connecting tube. One end of the support spring is fixedly connected to the cross-shaped connecting tube, and the other end is fixedly connected to the sliding cavity.
3. The magnetically coupled rotary sealing device for an internal mixer according to claim 1, characterized in that: The driven rotation mechanism includes a driven shaft, a first cylindrical permanent magnet fixedly connected to the outside of the driven shaft, a first disc permanent magnet fixedly connected to the end of the driven shaft away from the mounting ring, a bearing connected to the outside of the driven shaft, the outside of the bearing connected to the inside of the mounting ring, and several sealing rings sleeved on the outside of the driven shaft.
4. A magnetically coupled rotary sealing device for an internal mixer according to claim 1, characterized in that: The active rotation mechanism includes an active shaft, which is movably connected to the second sealed housing. One end of the active shaft extends into the external environment, and the other end has a groove. A second cylindrical permanent magnet and a second disc permanent magnet are fixedly connected in the groove.
5. A magnetically coupled rotary sealing device for an internal mixer according to claim 1, characterized in that: The second connecting mechanism includes a second connecting pipe and a cross-shaped connecting block. The second connecting pipe is fixedly connected inside the second sealing housing. The upper end of the second connecting pipe is connected to the positioning through hole, and the lower end of the second connecting pipe is tapered.
6. A magnetically coupled rotary sealing device for an internal mixer according to claim 5, characterized in that: The cross-shaped connecting block slides into the connecting cavity, which is located inside the second sealing shell. A limiting spring is sleeved on the outside of the cross-shaped connecting block. One end of the limiting spring is fixedly connected to the cross-shaped connecting block, and the other end is fixedly connected to the connecting cavity. A curved connecting hole is provided inside the cross-shaped connecting block.
7. A magnetically coupled rotary sealing device for an internal mixer according to claim 1, characterized in that: A sealing ring is fixedly connected to one end of the mounting ring, and several mounting screws are provided on the outer side of the mounting ring.
8. A magnetically coupled rotary sealing device for an internal mixer according to claim 1, characterized in that: The exhaust dust collection mechanism includes a movable tube, which is movably connected to the second sealed housing. The lower end of the movable tube extends into the external environment and is connected to the dust collection bag. A return spring is sleeved on the outside of the movable tube. One end of the return spring is fixedly connected to the inside of the second sealed housing, and the other end is fixedly connected to the movable tube.