Concentric double-shaft stirring equipment

Abstract

The invention discloses concentric double-shaft stirring equipment, and relates to the field of stirring equipment, the concentric double-shaft stirring equipment comprises an outer shaft and an inner shaft which are coaxially arranged, the inner shaft is sleeved with the outer shaft, the outer shaft is coaxially sleeved with a box body, one side of the box body is provided with an outer shaft transmission assembly used for driving the outer shaft to transmit, and a transmission part of the outer shaft transmission assembly is arranged in the box body; an inner cavity is formed between the outer shaft and the inner shaft, an outer cavity is formed between the outer shaft and the box body, and a lubricating oil circulating system is arranged between the inner cavity and the outer cavity. Meanwhile, full lubrication and cooling of all friction parts are achieved through a lubricating oil circulating system, friction loss is reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of stirring equipment, and more particularly to a concentric double-shaft stirring equipment. Background Art

[0002] In industries like chemical and pharmaceuticals, mixing equipment is an essential component of critical equipment. Traditional concentric twin-shaft mixing equipment is typically used for applications requiring efficient mixing, dispersion, and mass or heat transfer. This design, by placing two coaxial but independently rotating agitators within the same vessel, enables more complex manipulation and processing of fluid materials.

[0003] In the prior art, when the concentric twin-shaft mixing equipment is operated at high temperature and high speed, friction between the mechanical seal of the inner shaft and the sliding bearing in the kettle will generate heat and cause failure, which seriously affects the service range and life of the equipment.

[0004] In summary, how to solve the lubrication and cooling of the friction parts in the concentric twin-shaft mixing equipment is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a concentric twin-shaft stirring device, which effectively solves the lubrication problem of the internal friction parts of the concentric twin-shaft stirring device.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A concentric biaxial mixing device comprises an outer shaft and an inner shaft arranged coaxially, wherein the outer shaft is sleeved on the inner shaft, a housing is coaxially sleeved on the outer shaft, an outer shaft transmission assembly for driving the outer shaft is provided on one side of the housing, and a transmission part of the outer shaft transmission assembly is provided in the housing;

[0008] An inner cavity is formed between the outer shaft and the inner shaft, an outer cavity is formed between the outer shaft and the box body, and a lubricating oil circulation system is provided between the inner cavity and the outer cavity.

[0009] Preferably, the outer shaft transmission assembly includes a first rotating motor and an active bevel gear arranged at the end of the transmission shaft of the first rotating motor, the outer surface of the outer shaft is fixedly sleeved with a driven bevel gear that cooperates with the active bevel gear, and the active bevel gear is located in the box.

[0010] Preferably, a mounting hole is provided on a side of the box body close to the first rotating motor, a mounting cylinder is provided on the side wall of the mounting hole, and the mounting cylinder extends in a direction away from the outer shaft, and the end of the mounting cylinder away from the box body is sealed and fixedly connected to the front end cover of the first rotating motor.

[0011] Preferably, an outer shaft upper sealing seat and an outer shaft lower sealing seat are respectively provided at both ends of the box body, and an outer shaft upper bearing and an outer shaft lower bearing are respectively provided on the inner side of the outer shaft upper sealing seat and the inner side of the outer shaft lower sealing seat;

[0012] An outer shaft upper seal is provided between the outer shaft upper seal seat and the outer shaft, and an outer shaft lower seal is provided between the outer shaft lower seal seat and the outer shaft.

[0013] Preferably, the lubricating oil circulation system includes a lubricating oil external circulation inlet opened on one side of the lower sealing seat of the outer shaft and connected to the outer cavity, and a lubricating oil external circulation outlet opened on one side of the upper sealing seat of the outer shaft and connected to the outer cavity. A guide pipe is provided in the inner cavity, and the two ends of the guide pipe are respectively connected to the outer cavity and the inner cavity. An axial flow impeller is fixedly provided on the inner shaft to make the lubricating oil in the inner cavity flow upward. A lubricating oil internal circulation hole is opened on the outer shaft, and the lubricating oil internal circulation hole is connected between the inner cavity and the outer cavity.

[0014] Preferably, a lubricating oil external circulation system is formed between the lubricating oil external circulation inlet and the lubricating oil external circulation outlet;

[0015] A lubricating oil internal circulation system is formed between the guide pipe and the lubricating oil internal circulation hole.

[0016] Preferably, the inner shaft is located at two ends of the box body and is respectively provided with an inner shaft upper sealing seat and an inner shaft lower sealing seat, and the inner side of the inner shaft upper sealing seat and the inner side of the inner shaft lower sealing seat are respectively provided with an inner shaft upper bearing and an inner shaft lower bearing;

[0017] An inner shaft upper seal is provided between the inner shaft upper seal seat and the inner shaft, and an inner shaft lower seal is provided between the inner shaft lower seal seat and the inner shaft;

[0018] The lubricating oil inner circulation hole is located between the sealing seat on the inner shaft and the bearing on the inner shaft and between the sealing seat on the outer shaft and the bearing on the outer shaft.

[0019] Preferably, the inner shaft lower seal, the inner shaft upper seal, the outer shaft upper seal and the outer shaft lower seal are oil seals or mechanical seals.

[0020] Preferably, the number of blades of the axial flow impeller ranges from 2 to 24.

[0021] Preferably, it further includes an inner shaft transmission assembly, which includes a second rotating motor, a transmission shaft of the second rotating motor is coaxially arranged with the inner shaft, and the transmission shaft of the second rotating motor and the inner shaft are connected via an elastic coupling.

[0022] The concentric dual-shaft mixing equipment provided by the present invention integrates the outer shaft transmission, outer shaft seal and inner shaft seal into an integrated design, reducing the complexity of the traditional split design, simplifying the overall structure, improving the compactness of the equipment, and reducing the difficulty and cost of installation; the lubricating oil circulation system can circulate the lubricating oil between the relevant components of the inner and outer shafts, providing necessary lubrication and cooling for the upper and lower bearings, seals and outer shaft transmission gears and other key friction parts of the inner and outer shafts, reducing friction and extending service life, while maintaining the efficient and stable operation of the system, enhancing the reliability and adaptability of the equipment, and making maintenance simpler and more efficient.

[0023] The further solution provided in this application can also achieve at least one of the following beneficial technical effects:

[0024] An axial-flow impeller is used to make the lubricating oil in the inner cavity flow upward, enter the lubricating oil internal circulation hole through the bearing on the inner shaft, then flow to the outer cavity, and through the rotation of the outer shaft transmission component, return to the inner cavity through the guide pipe, forming an internal circulation of lubricating oil. At the same time, lubricating oil can enter from the lubricating oil external circulation inlet and be discharged from the lubricating oil external circulation outlet, forming an external circulation of lubricating oil. The combination of internal and external circulation ensures that the upper and lower bearings of the inner and outer shafts, the seals, and the external shaft transmission gears can obtain continuous lubrication and cooling, reducing friction and wear, extending the service life of each component, improving the stability and efficiency of equipment operation, and maintaining the efficient and stable operation of the system, enhancing the reliability and adaptability of the equipment, making maintenance easier and more efficient, achieving system cooling and lubricating oil renewal, and ensuring the overall performance of the equipment;

[0025] Select the appropriate sealing form according to the operating pressure and temperature in the kettle. When the temperature and pressure are high, choose a single-end mechanical seal. It can flexibly adapt to different working conditions to ensure that the equipment can maintain a good sealing effect under various conditions, ensure the safety and cleanliness of the production process, and extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0027] Figure 1 Schematic diagram of the overall structure of the concentric biaxial stirring device in this embodiment;

[0028] Figure 2 Schematic diagram of the upper part of the concentric biaxial stirring device in this embodiment;

[0029] Figure 3 Schematic diagram of the lower part of the concentric biaxial stirring device in this embodiment.

[0030] Figure 1-Figure 3 , the reference numerals include:

[0031] 1. Inner shaft transmission assembly; 2. Frame; 3. Elastic coupling; 4. Lubricating oil internal circulation hole; 5. External cavity; 6. Active bevel gear; 7. External shaft transmission assembly; 8. Internal cavity; 9. First key; 10. External shaft lower bearing; 11. Lubricating oil external circulation inlet; 12. Inner shaft; 13. External shaft; 14. Second key; 15. Split coupling; 16. Grinding dust collection tank; 17. Inner shaft lower seal; 18. Plug; 19. Coupling; 20. Agitator shaft; 21. Inner shaft upper seal seat; 22. First O-ring; 23. Sealing seat on outer shaft; 24. Second O-ring; 25. Lubricating oil external circulation outlet; 26. Seal on outer shaft; 27. Seal on inner shaft; 28. Bearing on outer shaft; 29. ​​Bearing on inner shaft; 30. Housing; 31. Axial-flow impeller; 32. Driven bevel gear; 33. Third O-ring; 34. Seal on outer shaft; 35. Sealing seat on outer shaft; 36. Draft tube; 37. Outer frame agitator; 38. Bearing on inner shaft; 39. Sealing seat on inner shaft; 40. Fourth O-ring. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Unless otherwise defined, the technical terms or scientific terms used in this application shall have the usual meanings understood by persons of ordinary skill in the field to which the invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance. "Connected" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly. The embodiment of the present application discloses a concentric biaxial stirring device.

[0034] The core of the present invention is to provide a concentric double-shaft stirring device.

[0035] Please refer to Figure 1 .

[0036] The concentric biaxial mixing equipment provided by the present invention includes a coaxially arranged outer shaft 13 and an inner shaft 12. The outer shaft 13 is sleeved on the inner shaft 12. A housing 30 is coaxially sleeved on the outer shaft 13. An outer shaft transmission assembly 7 for driving the outer shaft 13 is provided on one side of the housing 30. The transmission part of the outer shaft transmission assembly 7 is provided in the housing 30. An inner cavity 8 is formed between the outer shaft 13 and the inner shaft 12, and an outer cavity 5 is formed between the outer shaft 13 and the housing 30. A lubricating oil circulation system is provided between the inner cavity 8 and the outer cavity 5.

[0037] Specifically, the outer shaft 13 is sleeved on the inner shaft 12, and the two are coaxially arranged. A housing 30 is coaxially sleeved on the outer shaft 13. An outer shaft transmission assembly 7 is provided on one side of the housing 30 to drive the outer shaft transmission. The transmission portion of the outer shaft transmission assembly 7 is provided within the housing 30, so that the outer shaft transmission assembly 7 and the outer shaft 13 can effectively transmit and cooperate, achieving stable transmission of the outer shaft 13. An inner cavity 8 is formed between the outer shaft 13 and the inner shaft 12, and an outer cavity 5 is formed between the outer shaft 13 and the housing 30. A lubricating oil circulation system is provided between the inner cavity 8 and the outer cavity 5. The lubricating oil circulation system can provide the necessary lubrication and cooling for the upper and lower bearings of the inner and outer shafts, reducing friction and extending the service life of each component. The effective lubrication and cooling mechanism also helps to reduce the heat and wear generated by friction, thereby reducing energy loss and improving transmission efficiency. It also helps to maintain the good condition of the seals, prevent leakage, and ensure the safety and cleanliness of the production process.

[0038] Optionally, the external shaft transmission assembly 7 may also adopt a worm gear drive instead of a bevel gear drive. The worm gear drive mode has the advantages of large transmission ratio, compact structure, smooth operation and low noise. The worm gear transmission assembly includes a worm wheel and a worm, the worm is mounted on the transmission shaft of the first rotating motor, and the worm gear is fixedly sleeved on the external shaft 13. The first rotating motor drives the worm to rotate, and the worm drives the worm wheel to rotate, thereby realizing the transmission of the external shaft. The concentric double-shaft mixing equipment driven by worm gear also realizes the integration of external shaft transmission, sealing and lubrication. The large transmission ratio characteristics of the worm gear transmission mode can achieve a larger reduction ratio without the need for multi-stage transmission, making the equipment structure more compact. Its characteristics of smooth operation and low noise are suitable for occasions with high requirements on the working environment.

[0039] The above-mentioned concentric twin-shaft mixing equipment integrates the outer shaft drive, outer shaft seal and inner shaft seal into an integrated design, which reduces the complexity of the traditional split design, simplifies the overall structure, improves the compactness of the equipment, and reduces the difficulty and cost of installation; the lubricating oil circulation system can circulate the lubricating oil between the related components of the inner and outer shafts, providing the necessary lubrication and cooling for the upper and lower bearings, seals and outer shaft transmission gears and other key friction parts of the inner and outer shafts, reducing friction and extending service life, while maintaining the efficient and stable operation of the system, enhancing the reliability and adaptability of the equipment, and making maintenance easier and more efficient.

[0040] The concentric biaxial stirring device provided by the present invention is described in more detail below with reference to the accompanying drawings and specific embodiments.

[0041] In a specific embodiment, reference Figures 1 to 3 The outer shaft transmission assembly 7 includes a first rotating motor and a driving bevel gear 6 arranged at the end of the transmission shaft of the first rotating motor. The outer surface of the outer shaft 13 is fixedly sleeved with a driven bevel gear 32 that cooperates with the driving bevel gear 6. The driving bevel gear 6 is located in the box body 30.

[0042] Specifically, the outer shaft transmission assembly 7 includes a first rotating motor, a driving bevel gear 6 is provided at the end of its transmission shaft, the driving bevel gear 6 is located within the housing 30, and a driven bevel gear 32 that matches the driving bevel gear 6 is fixedly sleeved on the outer surface of the outer shaft 13. After the first rotating motor is started, its power is transmitted to the driving bevel gear 6 via the transmission shaft, and the driving bevel gear 6 then drives the driven bevel gear 32 that is meshed with it to rotate, thereby driving the outer shaft 13 to rotate. In this way, through this bevel gear transmission method, a stable drive of the outer shaft 13 can be achieved, making the transmission more stable and reliable, effectively reducing the vibration and noise that may occur in the traditional transmission method, improving the operating stability of the equipment, and ensuring the normal and efficient operation of the concentric dual-shaft mixing equipment. The driven bevel gear 32 is connected to the outer shaft 13 through the first key 9, and the driven bevel gear 32 is fixedly sleeved on the outer surface of the outer shaft 13 by means of interference fit and the like.

[0043] Alternatively, the first rotating motor can be a common three-phase asynchronous motor, which offers advantages such as simple structure, reliable operation, and easy maintenance. Alternatively, a servo motor can be used, as it enables precise speed and position control and is particularly suitable for applications requiring high mixing accuracy. The driving bevel gear 6 and the driven bevel gear 32 are typically manufactured from high-strength alloy steel to ensure wear resistance and strength during transmission.

[0044] Based on any of the above embodiments, Figure 1 A mounting hole is provided on one side of the box body 30 close to the first rotating motor, and a mounting cylinder is provided on the side wall of the mounting hole. The mounting cylinder extends in a direction away from the outer shaft 13, and one end of the mounting cylinder away from the box body 30 is sealed and fixedly connected to the front end cover of the first rotating motor.

[0045] Specifically, a mounting hole is defined on one side of the housing 30 near the first rotating motor. A mounting cylinder is disposed on the sidewall of the mounting hole, extending away from the outer shaft 13. The end of the mounting cylinder, away from the housing, is sealed and fixedly connected to the front end cover of the first rotating motor. The transmission shaft of the first rotating motor and the active bevel gear 6 are both located within the mounting cylinder. This ensures a tight and sealed connection between the first rotating motor and the housing, preventing foreign matter from entering and affecting the normal operation of the transmission assembly.

[0046] The sealed, fixed connection creates a relatively closed environment, reducing external interference with the external shaft drive assembly within the housing. This not only ensures the external shaft drive assembly stably drives the external shaft 13, improving the stability of the equipment's operation, but also reduces damage to the drive assembly caused by the ingress of foreign matter, extending the equipment's service life. It also reduces the probability of equipment failure due to foreign matter interference, reducing maintenance costs and downtime, and improving the equipment's overall performance and reliability.

[0047] Optionally, the mounting cylinder is generally made of a metal material, such as stainless steel, which has good strength and corrosion resistance. The mounting cylinder can be fixedly connected to the housing 30 by welding or other means to ensure the firmness of the connection. The mounting cylinder and the front end cover of the first rotating motor are sealed and fixedly connected by bolts or other connecting members. This structural design can tightly connect the first rotating motor and the housing 30, reducing vibration and noise of the equipment, while also preventing external dust and debris from entering the housing and affecting the normal operation of the equipment.

[0048] Based on any of the above embodiments, Figures 1 to 3 The outer shaft upper seal seat 23 and the outer shaft lower seal seat 35 are respectively provided at both ends of the housing 30. The outer shaft upper bearing 28 and the outer shaft lower bearing 10 are respectively provided on the inner sides of the outer shaft upper seal seat 23 and the inner sides of the outer shaft lower seal seat 35. The outer shaft upper seal 26 is provided between the outer shaft upper seal seat 23 and the outer shaft 13, and the outer shaft lower seal 34 is provided between the outer shaft lower seal seat 35 and the outer shaft 13.

[0049] Specifically, the outer shaft upper seal seat 23 and the outer shaft lower seal seat 35 are respectively provided at both ends of the housing 30. The outer shaft upper seal seat 23 and the outer shaft lower seal seat 35 are respectively provided with the outer shaft upper bearing 28 and the outer shaft lower bearing 10. The outer shaft upper seal seat 23 and the outer shaft lower seal seat 35 are generally made of cast iron or cast steel, and have good rigidity and stability. The outer shaft upper bearing 28 and the outer shaft lower bearing 10 can be selected from rolling bearings, such as deep groove ball bearings and cylindrical roller bearings. Rolling bearings have advantages such as low friction coefficient, high operating precision, and long service life. The outer shaft upper bearing 28 and the outer shaft lower bearing 10 are respectively installed on the inner sides of the outer shaft upper seal seat 23 and the outer shaft lower seal seat 35, and axial positioning is achieved by means of shaft shoulders, retaining springs, etc., to ensure that the outer shaft can rotate smoothly.

[0050] An outer shaft upper seal 26 is provided between the outer shaft upper seal seat 23 and the outer shaft 13, and an outer shaft lower seal 34 is provided between the outer shaft lower seal seat 35 and the outer shaft 13. The outer shaft upper seal 26 and the outer shaft lower seal 34 can be either oil seals or mechanical seals. Oil seals have a simple structure and low cost, making them suitable for general sealing requirements. Mechanical seals, on the other hand, offer advantages such as good sealing performance and a long service life, making them suitable for more demanding operating conditions such as high temperature, high pressure, and high speed. When the operating pressure and temperature within the kettle are high, a single-end mechanical seal is preferred. The provision of the outer shaft upper seal 26 and the outer shaft lower seal 34 effectively prevents lubricating oil leakage, ensuring the normal operation of the equipment.

[0051] Optionally, a second O-ring 24 is provided between the outer shaft upper sealing seat 23 and the box body 30 , and a third O-ring 33 is provided between the outer shaft lower sealing seat 35 and the box body 30 , thereby further improving the seal between the upper and lower sealing seats of the outer shaft and the box body 30 .

[0052] Based on any of the above embodiments, Figures 1 to 3 The lubricating oil circulation system includes a lubricating oil external circulation inlet 11, which is opened on one side of the outer shaft lower seal seat 35 and communicates with the outer cavity 5, and a lubricating oil external circulation outlet 25, which is opened on one side of the outer shaft upper seal seat 23 and communicates with the outer cavity 5. A guide tube 36 is provided in the inner cavity 8, and the two ends of the guide tube 36 are respectively connected to the outer cavity 5 and the inner cavity 8. An axial flow impeller 31 is fixedly provided on the inner shaft 12 to allow the lubricating oil in the inner cavity 8 to flow upward. A lubricating oil internal circulation hole 4 is opened on the outer shaft 13, and the lubricating oil internal circulation hole 4 is connected between the inner cavity 8 and the outer cavity 5. A lubricating oil external circulation system is formed between the lubricating oil external circulation inlet 11 and the lubricating oil external circulation outlet 25. A lubricating oil internal circulation system is formed between the guide tube 36 and the lubricating oil internal circulation hole 4.

[0053] Specifically, the lubricating oil external circulation inlet 11 of the external circulation part of the lubricating oil circulation system is opened on the side of the outer shaft lower sealing seat 35, and is connected to the outer cavity 5. The lubricating oil external circulation outlet 25 is opened on the side of the outer shaft upper sealing seat 23, and is also connected to the outer cavity 5. A guide tube 36 is set in the inner cavity 8 of the internal circulation part, and the two ends of the guide tube 36 are respectively connected to the outer cavity 5 and the inner cavity 8. An axial flow impeller 31 is fixedly mounted on the inner shaft 12. When the inner shaft 12 rotates clockwise, the axial flow impeller 31 generates an upward driving force on the lubricating oil, causing the lubricating oil in the inner cavity 8 to flow upward, enter the lubricating oil internal circulation hole 4 through the bearing on the inner shaft 12, and then flow to the outer cavity 5. After the rotation of the active bevel gear 6 and the driven bevel gear 32, the lubricating oil enters the inner cavity 8 along the two guide tubes 36 set above the outer shaft lower bearing 10, thus forming an internal and external circulation flow.

[0054] The above structure provides the necessary lubrication and cooling for the upper and lower bearings of the inner and outer shafts, reducing friction and extending the service life of the bearings. At the same time, the lubricating oil continues to flow to the seals on the inner and outer shafts, including through the gaps between the components such as the inner shaft lower seal seat 39, the outer shaft upper seal seat 23, and the outer shaft lower seal seat 35, to ensure a full range of sealing effects and prevent leakage. The axial flow impeller 31 promotes the flow of lubricating oil throughout the system, ensuring that every part that needs lubrication is covered. The old lubricating oil is discharged through the lubricating oil external circulation outlet, and new oil is replenished from the external circulation inlet to maintain the optimal operating state of the system. This process ensures that all key friction parts can obtain continuous lubrication and cooling, maintains the efficient and stable operation of the entire system, enhances the reliability and adaptability of the equipment, and makes maintenance easier and more efficient.

[0055] The lubricating oil circulation system is described below. Lubricating oil enters through the lubricating oil external circulation inlet 11 and, after circulating a certain amount, is discharged and replenished through the lubricating oil external circulation outlet 25. The lubricating oil internal circulation path follows: lubricating oil flows from the lubricating oil external circulation inlet 11 → the external cavity 5 → the flow guide 36 → the internal cavity 8 → the lubricating oil internal circulation hole 4 → the external cavity 5 → the flow guide 36, thus forming an internal lubricating oil loop.

[0056] Based on any of the above embodiments, Figures 1 to 3 The inner shaft 12 is located at both ends of the housing 30 and is provided with an inner shaft upper seal seat 21 and an inner shaft lower seal seat 39, respectively. The inner shaft upper bearing 29 and the inner shaft lower bearing 38 are respectively provided on the inner side of the inner shaft upper seal seat 21 and the inner shaft lower seal seat 39. An inner shaft upper seal 27 is provided between the inner shaft upper seal seat 21 and the inner shaft 12, and an inner shaft lower seal 17 is provided between the inner shaft lower seal seat 39 and the inner shaft 12. The lubricating oil internal circulation hole 4 is located between the inner shaft upper seal seat 21 and the inner shaft upper bearing 29, and between the outer shaft upper seal seat 23 and the outer shaft upper bearing 28.

[0057] Specifically, the inner shaft 12 is provided with an upper inner shaft seal seat 21 and a lower inner shaft seal seat 39 at either end of the housing 30, forming a relatively closed space structure (i.e., inner cavity 8) with the housing 30. Mounted within the upper inner shaft seal seat 21 and the lower inner shaft seal seat 39 are an upper inner shaft bearing 29 and a lower inner shaft bearing 38, respectively. These bearings enable stable rotation of the inner shaft 12, providing support and reducing rotational friction. An upper inner shaft seal 27 is provided between the upper inner shaft seal seat 21 and the inner shaft 12, while a lower inner shaft seal 17 is provided between the lower inner shaft seal seat 39 and the inner shaft 12. These two sets of seals prevent lubricating oil leakage, ensuring lubrication and the sealing of the equipment. The lubricating oil internal circulation hole 4 is located between the sealing seat 21 on the inner shaft and the bearing 29 on the inner shaft, and between the sealing seat 23 on the outer shaft and the bearing 28 on the outer shaft. After the lubricating oil enters from the external circulation inlet, the inner shaft rotates clockwise, and the axial flow impeller generates an upward driving force, causing the lubricating oil in the inner cavity to flow upward, pass through the bearing on the inner shaft, enter the lubricating oil internal circulation hole 4, and then flow to the outer cavity 5. Such a structure forms a complete lubricating oil internal circulation path. The circulating flow of lubricating oil provides lubrication and cooling for the upper and lower bearings of the inner and outer shafts, reduces frictional heat, and thus extends the service life of the bearings. The lubricating oil can also flow to the seals on the inner and outer shafts, ensuring a full range of sealing effects and preventing leakage. In addition, this setting makes the design of the entire sealing and transmission device more compact, realizes the integration of transmission, sealing and lubrication, improves the reliability and efficiency of the equipment, maintains the efficient and stable operation of the entire system, enhances the adaptability of the equipment, and makes maintenance easier and more efficient.

[0058] The selection of the inner shaft upper seal 27 and the inner shaft lower seal 17 is similar to that of the outer shaft upper seal 26 and the outer shaft lower seal 34. Whether to use an oil seal or a mechanical seal is determined by the operating pressure and temperature within the reactor. The provision of the inner shaft upper seal 27 and the inner shaft lower seal 17 prevents lubricating oil leakage and ensures the sealing performance of the inner shaft.

[0059] Optionally, a first O-ring 22 is provided between the inner shaft upper sealing seat 21 and the box body 30 , and a fourth O-ring 40 is provided between the inner shaft lower sealing seat 39 and the box body 30 , thereby further improving the sealing between the inner shaft upper and lower sealing seats and the box body 30 .

[0060] It should be noted that a chip enrichment groove 16 is formed between the inner shaft lower sealing seat 39 and the inner shaft lower bearing 38, which is used to collect the chips generated by the concentric twin-shaft mixing equipment during operation. At the same time, a chip discharge port is opened at the bottom of the chip enrichment groove 16, and the chip discharge port is removably sealed by a plug 18.

[0061] Based on any of the above embodiments, the number of blades of the axial flow impeller 31 ranges from 2 to 24.

[0062] Specifically, the axial-flow impeller 31 is usually made of aluminum alloy or stainless steel, and the number of blades ranges from 2 to 24, with a more suitable number being 4 to 12. The reasonable design of the number of blades of the axial-flow impeller 31 can ensure that it plays a good role in promoting the circulation of lubricating oil between the upper and lower bearings of the inner and outer shafts, seals, and the outer shaft transmission gears. If the number of blades is too small, it may not generate enough thrust to fully circulate the lubricating oil; if the number of blades is too large, it may increase resistance and affect the circulation efficiency of the lubricating oil. In this way, the lubricating oil can circulate smoothly between the inner and outer cavities, providing sufficient lubrication and cooling for all key friction parts such as the upper and lower bearings, seals, etc. of the inner and outer shafts.

[0063] Based on any of the above embodiments, Figure 1 The concentric biaxial mixing equipment also includes an inner shaft transmission assembly 1, which includes a second rotating motor. The transmission shaft of the second rotating motor is coaxially arranged with the inner shaft 12, and the transmission shaft and the inner shaft 12 are connected by an elastic coupling 3.

[0064] Specifically, the inner shaft transmission assembly 1 includes a second rotating motor, the transmission shaft of the second rotating motor is coaxially arranged with the inner shaft 12, and the two are connected by an elastic coupling 3, which can achieve relatively stable transmission. The elastic coupling 3 can compensate for the relative displacement of the two shafts, absorb vibrations and shocks, reduce the vibrations and shocks transmitted to the inner shaft 12, and avoid excessive vibrations caused by the rigid connection affecting the stability of the equipment operation. In addition, the coaxial arrangement ensures the efficiency and accuracy of power transmission, allowing the inner shaft 12 to rotate stably at the expected speed and direction, thereby better driving the stirring component, allowing the stirring equipment to achieve a more accurate and stable stirring effect during the stirring process, which is conducive to improving the stirring quality, enhancing the reliability of the equipment during long-term operation, and reducing the failure rate and maintenance cost of the equipment. The second rotating motor can also be selected from a three-phase asynchronous motor or a servo motor, and can be selected according to actual needs. The elastic coupling 3 has the performance of buffering, vibration reduction and compensating for the relative displacement of the two shafts, which can reduce vibrations and shocks during the transmission process and ensure the stability of the inner shaft transmission.

[0065] It should be noted that the upper end of the outer shaft seal seat 23 is provided with a frame 2 for securing the inner shaft transmission assembly 1. The frame 2 is hollow, and the drive shaft of the second rotating motor and the elastic coupling 3 are both located within the frame 2. The ends of the frame 2 are respectively connected to the front end cover of the second rotating motor and the outer shaft seal seat 23. These connections can be fixed by welding or other means to ensure a secure connection. The outer shaft seal seat 23 is sealed and fixedly connected to the front end cover of the first rotating motor using bolts and other fasteners.

[0066] It should also be noted that the reference Figure 1The lower end of the inner shaft 12 is connected to the stirring shaft 20 through a coupling 19. The inner shaft 12 and the outer shaft 13 are driven by a split coupling 15, and the outer shaft 13 is connected to the outer frame stirrer through a second key 14.

[0067] In addition to the concentric biaxial stirring equipment disclosed above, this application also simulates and analyzes the sealing liquid flow field and temperature field under the internal and external double circulation by establishing a model based on computational fluid dynamics (CFD) to ensure that the system can operate stably under different working conditions.

[0068] Specifically, to ensure the optimal performance of the internal and external dual circulation system under different working conditions, we use CFD technology to simulate the flow field and temperature field of the sealing fluid. The specific steps are as follows:

[0069] Meshing: Create a three-dimensional model of the interior of the mixing equipment and divide it into multiple small cells.

[0070] Boundary condition setting: Set the inlet and outlet flow, pressure, temperature and other boundary conditions according to the actual working conditions.

[0071] Numerical solution: The finite volume method (FVM) is used to discretize the Navier-Stokes equations and solve them to obtain the pressure, velocity, and temperature distributions at each point.

[0072] And analyze the results: By analyzing the simulation results, optimize the design parameters of the equipment, such as the number of impeller blades, speed, etc. The impeller design should ensure uniform distribution and efficient circulation of the lubricating oil.

[0073] The implementation principle of a concentric twin-shaft stirring device according to an embodiment of the present application is as follows: the concentric twin-shaft stirring device according to this embodiment reduces the overall size and complexity of the device and improves the compactness and stability of the device by integrating the outer shaft transmission, outer shaft seal and inner shaft seal into an integrated design. Through the lubricating oil circulation system, including internal circulation and external circulation, the lubricating oil can circulate between the upper and lower bearings of the inner and outer shafts, the seals and the outer shaft transmission gear, ensuring that all key friction parts are fully lubricated and cooled, extending the service life of each component, reducing energy loss and improving transmission efficiency. At the same time, the upper and lower seals of the inner and outer shafts can be selected as oil seals or mechanical seals according to actual working conditions, thereby enhancing the adaptability of the equipment. The inner shaft transmission assembly is connected to the inner shaft through an elastic coupling, which ensures the stability of the inner shaft transmission. Compared with traditional concentric twin-shaft stirring devices, the equipment of this embodiment solves the problems of lubrication and cooling under high temperature and high speed, reduces the difficulty of installation and maintenance, and adapts to the high performance requirements of stirring equipment in industries such as chemical and pharmaceutical industries.

[0074] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0075] The above is a detailed introduction to a concentric biaxial stirring device provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core concept. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A concentric biaxial stirring device, comprising an outer shaft (13) and an inner shaft (12) arranged coaxially, wherein the outer shaft (13) is sleeved on the inner shaft (12), characterized in that: A box body (30) is coaxially sleeved on the outer shaft (13), an outer shaft transmission assembly (7) for driving the outer shaft (13) is provided on one side of the box body (30), and a transmission part of the outer shaft transmission assembly (7) is provided in the box body (30); An inner cavity (8) is formed between the outer shaft (13) and the inner shaft (12), an outer cavity (5) is formed between the outer shaft (13) and the housing (30), and a lubricating oil circulation system is provided between the inner cavity (8) and the outer cavity (5).

2. A concentric biaxial stirring device according to claim 1, characterized in that: The outer shaft transmission assembly (7) comprises a first rotating motor and a driving bevel gear (6) arranged at the end of a transmission shaft of the first rotating motor; a driven bevel gear (32) that cooperates with the driving bevel gear (6) is fixedly sleeved on the outer surface of the outer shaft (13); and the driving bevel gear (6) is located in the housing (30).

3. A concentric biaxial stirring device according to claim 2, characterized in that: A mounting hole is provided on a side of the box body (30) close to the first rotating motor, a mounting cylinder is provided on a side wall of the mounting hole, and the mounting cylinder extends in a direction away from the outer shaft (13), and one end of the mounting cylinder away from the box body (30) is sealed and fixedly connected to the front end cover of the first rotating motor.

4. A concentric biaxial stirring device according to claim 2, characterized in that: An outer shaft upper sealing seat (23) and an outer shaft lower sealing seat (35) are respectively provided at both ends of the box body (30), and an outer shaft upper bearing (28) and an outer shaft lower bearing (10) are respectively provided on the inner side of the outer shaft upper sealing seat (23) and the inner side of the outer shaft lower sealing seat (35); An outer shaft upper seal (26) is provided between the outer shaft upper seal seat (23) and the outer shaft (13), and an outer shaft lower seal (34) is provided between the outer shaft lower seal seat (35) and the outer shaft (13).

5. A concentric biaxial stirring device according to claim 4, characterized in that: The lubricating oil circulation system comprises a lubricating oil external circulation inlet (11) opened on one side of the outer shaft lower sealing seat (35) and connected to the outer cavity (5), and a lubricating oil external circulation outlet (25) opened on one side of the outer shaft upper sealing seat (23) and connected to the outer cavity (5). A guide pipe (36) is provided in the inner cavity (8), and the two ends of the guide pipe (36) are respectively connected to the outer cavity (5) and the inner cavity (8). An axial flow impeller (31) is fixedly provided on the inner shaft (12) to allow the lubricating oil in the inner cavity (8) to flow upward. A lubricating oil internal circulation hole (4) is opened on the outer shaft (13), and the lubricating oil internal circulation hole (4) is connected between the inner cavity (8) and the outer cavity (5).

6. The concentric biaxial stirring device according to claim 5, characterized in that: A lubricating oil external circulation system is formed between the lubricating oil external circulation inlet (11) and the lubricating oil external circulation outlet (25); A lubricating oil internal circulation system is formed between the guide pipe (36) and the lubricating oil internal circulation hole (4).

7. The concentric biaxial stirring device according to claim 6, characterized in that: The inner shaft (12) is located at two ends of the box body (30) and is respectively provided with an inner shaft upper sealing seat (21) and an inner shaft lower sealing seat (39); an inner shaft upper bearing (29) and an inner shaft lower bearing (38) are respectively provided on the inner side of the inner shaft upper sealing seat (21) and the inner side of the inner shaft lower sealing seat (39); An inner shaft upper seal (27) is provided between the inner shaft upper seal seat (21) and the inner shaft (12), and an inner shaft lower seal (17) is provided between the inner shaft lower seal seat (39) and the inner shaft (12); The lubricating oil internal circulation hole (4) is located between the inner shaft seal seat (21) and the inner shaft bearing (29), and between the outer shaft seal seat (23) and the outer shaft bearing (28).

8. The concentric biaxial stirring device according to claim 7, characterized in that: The inner shaft lower seal (17), the inner shaft upper seal (27), the outer shaft upper seal (26), and the outer shaft lower seal (34) are oil seals or mechanical seals.

9. The concentric biaxial stirring device according to claim 5, characterized in that: The number of blades of the axial flow impeller (31) ranges from 2 to 24.

10. The concentric biaxial stirring device according to claim 1, characterized in that: The invention also includes an inner shaft transmission assembly (1), wherein the inner shaft transmission assembly (1) includes a second rotating motor, a transmission shaft of the second rotating motor is coaxially arranged with the inner shaft (12), and the transmission shaft of the second rotating motor and the inner shaft (12) are connected via an elastic coupling (3).

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