Closed cycle spray drying rotary atomizer

Abstract

The application discloses a closed circulation spray drying rotary atomizer and relates to the application field of evaporation drying atomizers, which comprises a gear box and a driving device, the bottom of the gear box is provided with an upper oil tank, the bottom of the upper oil tank is provided with a lower oil tank, the interiors of the upper oil tank and the lower oil tank are provided with a transmission shaft, and an atomization protection structure is arranged. The annular air curtain is arranged, the transmission shaft is wrapped by the annular air curtain, the countercurrent gas outside is blocked, the risk that the external contaminated gas enters the oil tank is reduced, the annular air curtain storage has a certain distribution range, when the warm nitrogen gas is filled in the storage gap, the local metal wall and the space where the discharge gap is located can be heated, the water droplets formed by the condensation of water vapor in the drying tower are reduced, and the slurry water vapor condensation scale is also reduced.

Description

Technical Field

[0001] This invention relates to the field of evaporative drying atomizers, specifically a closed-loop spray drying rotary atomizer. Background Technology

[0002] Rotary atomizers (centrifugal atomizers) are the core atomizing components of spray drying systems. They are typically used to break up electrode suspensions such as alumina into micron-sized fine droplets, significantly increasing the heat exchange area of ​​the material and achieving instantaneous drying.

[0003] The atomizer is used in conjunction with the drying tower. The atomizing head of the atomizer extends into the interior of the drying tower. The atomizer uses a motor and speed-increasing gears to drive the atomizing wheel to rotate at high speed. The liquid slurry flows into the atomizing wheel from the central feed pipe and is torn and thrown out under the action of huge centrifugal force, dispersing into uniform droplets. The high-temperature hot air in the drying tower comes into contact with the droplets, instantly removing the moisture from the slurry and transforming the liquid material into a highly fluid powder.

[0004] In the atomizer, the atomizing wheel at the bottom is mainly driven by the drive shaft, the speed-increasing gearbox, and the drive motor. The top of the drive shaft is connected to the speed-increasing gearbox and the drive motor, the bottom is connected to the atomizing wheel, and the middle passes through the oil tank used to lubricate the gearbox. When the drying tower and atomizer are operating normally, the centrifugal atomizing wheel rotates at high speed, generating a strong centrifugal force that drives airflow disturbance. While the atomizing wheel throws out slurry droplets at high speed, it also draws in the surrounding air downward to form a directional downward airflow. The hot air distributor at the top of the drying tower also blows downward in the same direction, making the airflow inside the tower generally downward. Therefore, it is difficult for the positive pressure hot air and powder inside the tower to flow backward and penetrate into the atomizer housing and the gap between the drive shaft. However, when the equipment experiences a mid-process shutdown or other factors, the atomizing wheel speed drops rapidly, causing the centrifugal turbulence effect to disappear. Meanwhile, the inside of the drying tower still maintains a slight positive pressure. Consequently, air inside the tower, as well as some droplets and powder, enter the rotation gap between the drive shaft and the atomizer housing through the gap of the atomizing disc. Over time, this will not only damage the seals but also allow contaminants to eventually enter the lubricating oil tank, damaging the atomizer's lubrication and cooling system. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a closed-loop spray drying rotary atomizer to solve the technical problems mentioned in the background.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a closed-loop spray drying rotary atomizer, comprising a gearbox and a drive device. An upper oil tank is located at the bottom of the gearbox, and a lower oil tank is located at the bottom of the upper oil tank. A drive shaft is located inside both the upper and lower oil tanks. An atomizing wheel is located at the bottom of the drive shaft. The atomizing wheel is driven by the drive shaft, the gearbox, and the drive device. A fixing plate is located at the bottom of the lower oil tank, and an inner bushing is located at the bottom of the fixing plate. The inner bushing and the drive shaft are rotatably connected by an oil seal assembly. A double-layered sleeve is located outside the inner bushing, and a feeding sleeve is located outside the double-layered sleeve. A spiral groove is formed at the bottom of the feeding sleeve, and a sealing plate is located at the bottom of the feeding sleeve. A lower... A discharge gap is provided between the material sleeve, the feeding sleeve, and the interlayer sleeve. A feed pipe is provided on the top of the fixed plate. The feed pipe is connected to the electrode slurry conveying equipment. The feed pipe extends into the interior of the conveying sleeve and communicates with the spiral groove. The spiral groove is also connected to the discharge gap. A first annular groove is provided inside the conveying sleeve. Multiple sets of air inlets are provided on the inner side of the interlayer sleeve. An air storage gap is provided between the interlayer sleeve and the inner liner. An exhaust assembly is installed at the end of the interlayer sleeve of the inner liner. A second annular groove and multiple sets of exhaust holes are provided on the side of the exhaust assembly. An exhaust gap is provided between the exhaust assembly and the drive shaft. A nitrogen conveying system is connected to the first annular groove. The first annular groove, multiple sets of air inlets, the air storage gap, the second annular groove, multiple sets of exhaust holes, and the exhaust gap are sequentially connected.

[0007] By adopting the above technical solution, the atomizer is provided with a first annular groove, an air inlet, a gas storage gap, an exhaust assembly, a second annular groove, and an exhaust port from top to bottom. The gas storage gap is sleeved on the outside of the drive shaft and located inside the discharge gap. The exhaust assembly and the drive shaft are sleeved to form an exhaust gap. Warm nitrogen first enters the first annular groove, and then is distributed into the gas storage gap through multiple sets of air inlets. Then, it enters the exhaust gap outside the drive shaft from the multiple sets of exhaust ports in the second annular groove of the exhaust assembly, forming an annular air curtain that wraps around the outside of the drive shaft, blocking external backflow gas and reducing the risk of external polluting gas entering the oil tank. In addition, the gas storage gap has a certain distribution range. When the gas storage gap is filled with warm nitrogen, it can heat the local metal wall and the space where the discharge gap is located, reduce the water vapor in the drying tower from contacting the metal wall and condensing into water droplets, and also reduce the condensation and scaling of slurry water vapor.

[0008] The present invention is further configured such that the upper oil tank and the lower oil tank are filled with lubricating oil for lubricating the drive shaft and gearbox, and an oil pump and an oil well unit are provided above the upper oil tank.

[0009] Preferably, an oil pump is used to circulate the lubricating oil in the upper and lower oil tanks, while an oil sump unit is used to filter impurities from the lubricating oil, so that the gearbox can be adequately lubricated and cooled.

[0010] The present invention is further configured such that the multiple sets of exhaust holes are inclined, and the multiple sets of exhaust holes are inclined downward toward the outer wall of the drive shaft.

[0011] Preferably, by setting multiple sets of exhaust holes at an angle downward toward the outer wall of the drive shaft, nitrogen can form an annular air curtain around the outer wall of the drive shaft to block the backflow of external polluting gases.

[0012] The present invention is further configured such that a protective cover is provided between the upper oil tank and the fixed plate, and a first sealing ring is provided between the protective cover and the fixed plate, a second sealing ring is provided between the material conveying sleeve and the sealing plate, a third sealing ring is provided between the sealing plate and the material discharge sleeve, and a fourth sealing ring is provided between the interlayer sleeve and the exhaust assembly.

[0013] Preferably, by setting a protective cover and multiple sets of sealing rings, the sealing effect of the atomizer is improved, while reducing the entry of external polluting gases into the atomizer.

[0014] The present invention is further configured such that a rinsing plate is provided at the bottom of the sealing plate, and multiple sets of drainage holes are provided inside the rinsing plate.

[0015] Preferably, a rinsing plate is provided so that when disassembling and maintaining the atomizer, water is used to rinse the atomizing wheel. A water inlet is provided on the side of the rinsing plate, and the water flows into the interior of the rinsing plate and is evenly dispersed through multiple sets of drain holes, which can rinse the interior of the atomizing wheel.

[0016] The present invention is further configured such that an air intake component is provided at the bottom of the exhaust component, the air intake component includes a connecting sleeve, a conical sleeve is provided at the bottom of the connecting sleeve, and multiple sets of venturi tubes are provided on the outside of the conical sleeve.

[0017] Preferably, by setting up an air intake component, the amount of external polluting gas that actively approaches the annular air curtain can be reduced.

[0018] The present invention is further configured such that the exhaust assembly is provided with multiple sets of exhaust channels, which are respectively connected to multiple sets of venturi tubes, and the thin tubes of the multiple sets of venturi tubes are all connected to the inner side of the conical sleeve.

[0019] Preferably, by utilizing the negative pressure suction principle of the venturi tube, it is possible to simultaneously exhaust the exhaust gas and transfer specific external polluting gases.

[0020] The present invention is further configured such that a third annular groove is provided on the top of the atomizing wheel, and multiple sets of exhaust grooves are provided at the bottom of the third annular groove, with the multiple sets of exhaust grooves inclined toward the inner surface of the atomizing wheel.

[0021] Preferably, by setting a third annular groove and multiple sets of exhaust grooves, the nitrogen in the annular air curtain can be guided into the atomizing wheel. Thus, when the atomizer stops working, the residual atomized aluminum oxide inside the atomizing wheel is discharged immediately, reducing the deposition of atomized aluminum oxide inside the atomizing wheel. At the same time, an air curtain covering the atomizing wheel is formed, reducing the active approach of external polluting gases to the atomizing wheel.

[0022] The present invention is further configured such that the third annular groove corresponds to the exhaust gap.

[0023] Preferably, the third annular groove and the exhaust gap are aligned to ensure that the nitrogen gas in the annular air curtain can smoothly enter the third annular groove.

[0024] In summary, the present invention has the following main beneficial effects: 1. The present invention has a first annular groove, an air inlet, a gas storage gap, an exhaust assembly, a second annular groove, and an exhaust port arranged from top to bottom inside the atomizer. The gas storage gap is sleeved on the outside of the drive shaft and located inside the discharge gap. The exhaust assembly and the drive shaft are sleeved to form an exhaust gap. Warm nitrogen first enters the first annular groove, and then is distributed into the gas storage gap through multiple sets of air inlets. Then it enters the exhaust gap outside the drive shaft from the multiple sets of exhaust ports in the second annular groove of the exhaust assembly, forming an annular air curtain to wrap the outside of the drive shaft, blocking the backflow of external gas and reducing the risk of external contaminated gas entering the oil tank. In addition, the gas storage gap has a certain distribution range. When the gas storage gap is filled with warm nitrogen, it can heat the local metal wall and the space where the discharge gap is located, reduce the water vapor in the drying tower from contacting the metal wall and condensing into water droplets, and also reduce the condensation and scaling of slurry water vapor.

[0025] 2. This invention features an air intake component at the bottom of the exhaust assembly, which divides the incoming warm nitrogen gas into two paths. One path extends from the exhaust gap to form an air curtain barrier. A third annular groove and an exhaust groove are formed inside the atomizing wheel. The air curtain extending from the exhaust gap is blown into the third annular groove of the atomizing wheel and then discharged into the interior of the atomizing wheel from the exhaust groove, thus dispersing the water vapor gathered around the atomizing wheel. In this way, the first path of warm nitrogen gas can both form an air curtain for protection and act on the atomizing wheel. The second path of warm nitrogen gas is blown into multiple sets of Venturi tubes through multiple sets of exhaust channels. The thin tube in the middle of the Venturi tube is connected to the inner side of the air intake component. When the warm nitrogen gas flows through the Venturi tube, a low negative pressure is formed in a local position inside the air intake component, i.e., the exhaust gap. This allows external gas that wants to enter the fuel tank through the exhaust gap to be directly drawn out through the Venturi tube. In other words, the installation gap of the drive shaft is not only blocked by an annular air curtain, but also uses low negative pressure suction to reduce the amount of polluting gas that actively approaches the installation gap of the drive shaft. Attached Figure Description

[0026] Figure 1This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the protective cover of the present invention; Figure 3 This is a schematic diagram of the internal structure of the material conveying link of the atomizer of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the image; Figure 5 This is a schematic diagram showing the distribution of the feed pipe, conveying sleeve, spiral groove, and discharge gap of the present invention; Figure 6 This is a schematic diagram showing the distribution of the sandwich sleeve, the first annular groove, and the air inlet of the present invention; Figure 7 This is a schematic diagram of the gas storage gap, exhaust assembly, and exhaust gap distribution of the present invention; Figure 8 This is a schematic diagram of the exhaust assembly structure of the present invention; Figure 9 This is a schematic diagram showing the distribution of the exhaust assembly and the bleed air assembly of the present invention; Figure 10 For the present invention Figure 9 Enlarged view at point B in the diagram, showing the gas flow after the bleed air assembly is installed; Figure 11 This is a schematic diagram of the air intake assembly structure of the present invention; Figure 12 This is a schematic diagram of the internal structure of the air intake assembly of the present invention.

[0027] Explanation of reference numerals in the attached figures: 1. Upper oil tank; 2. Lower oil tank; 3. Drive shaft; 4. Gearbox; 5. Drive unit; 6. Oil pump; 7. Oil tank unit; 8. Protective cover; 9. Fixing plate; 10. First sealing ring; 11. Inner bushing; 12. Jacket sleeve; 13. Conveying sleeve; 14. Second sealing ring; 15. Sealing plate; 16. Third sealing ring; 17. Discharge sleeve; 18. Discharge gap; 19. Feed pipe; 20. Spiral groove; 21. First annular groove ; 22. Air inlet; 23. Air storage gap; 24. Exhaust assembly; 25. Fourth sealing ring; 26. Second annular groove; 27. Exhaust port; 28. Exhaust gap; 29. ​​Oil seal assembly; 30. Atomizing wheel; 31. Washing disc; 32. Drain hole; 33. Air intake assembly; 3301. Connecting sleeve; 3302. Conical sleeve; 3303. Venturi tube; 34. Exhaust channel; 35. Third annular groove; 36. Exhaust groove. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] The embodiments of the present invention will now be described.

[0030] Example 1: Please refer to Figures 1-8 A closed-loop spray drying rotary atomizer includes a gearbox 4 and a drive unit 5. An upper oil tank 1 is located at the bottom of the gearbox 4, and a lower oil tank 2 is located at the bottom of the upper oil tank 1. A drive shaft 3 is installed inside both the upper and lower oil tanks 1 and 2. The upper and lower oil tanks 1 and 2 are filled with lubricating oil for lubricating and cooling the gearbox 4 and the drive shaft 3. An atomizing wheel 30 is located at the bottom of the drive shaft 3. The atomizing wheel 30 centrifugally disperses the liquid alumina slurry into a mist through high-speed rotation, facilitating the hot air distributor of the drying tower to atomize the atomized alumina. Aluminum is evaporated and dried to remove moisture. The atomizing wheel 30 is connected to the drive shaft 3, gearbox 4, and drive unit 5. A fixing plate 9 is installed at the bottom of the lower oil tank 2, and an inner bushing 11 is installed at the bottom of the fixing plate 9. The inner bushing 11 and the drive shaft 3 are rotatably connected by an oil seal assembly 29. The oil seal assembly 29 can be configured as a skeleton seal to prevent lubricating oil leakage. A sandwich sleeve 12 is installed outside the inner bushing 11, and a conveying sleeve 13 is installed outside the sandwich sleeve 12. A spiral groove 20 is opened at the bottom of the conveying sleeve 13. A sealing plate 15 is provided at the bottom of the 3, and a feeding sleeve 17 is provided at the bottom of the sealing plate 15. A discharge gap 18 is provided between the feeding sleeve 17 and the interlayer sleeve 12. A feed pipe 19 is provided at the top of the fixing plate 9. The feed pipe 19 is connected to an electrode slurry conveying device. The feed pipe 19 extends into the interior of the conveying sleeve 13 and communicates with the spiral groove 20. The spiral groove 20 is also connected to the discharge gap 18. A first annular groove 21 is provided inside the conveying sleeve 13. Multiple sets of air inlets 22 are provided on the inner side of the interlayer sleeve 12. The interlayer sleeve 12 and the inner liner sleeve A gas storage gap 23 is provided between the inner liner 11 and the end of the jacket sleeve 12 of the inner liner 11 is equipped with an exhaust assembly 24. The side of the exhaust assembly 24 is provided with a second annular groove 26 and multiple sets of exhaust holes 27. An exhaust gap 28 is provided between the exhaust assembly 24 and the drive shaft 3. A nitrogen delivery system is connected to the first annular groove 21. The nitrogen delivery system includes nitrogen supply and nitrogen heating. The first annular groove 21 and multiple sets of air inlets 22, the gas storage gap 23, the second annular groove 26, multiple sets of exhaust holes 27 and the exhaust gap 28 are connected in sequence.

[0031] Please refer to the above embodiments for further details. Figure 2The upper oil tank 1 and the lower oil tank 2 are filled with lubricating oil for lubricating the drive shaft 3 and the gearbox 4. An oil pump 6 and an oil tank unit 7 are installed above the upper oil tank 1. The oil pump 6 is used to circulate the lubricating oil in the upper oil tank 1 and the lower oil tank 2. At the same time, the oil tank unit 7 is used to filter impurities in the lubricating oil, so that the gearbox 4 can be fully lubricated and cooled.

[0032] Please refer to the above embodiments for further details. Figure 8 Multiple sets of exhaust holes 27 are inclined and tilted downward toward the outer wall of the drive shaft 3. By tilting the multiple sets of exhaust holes 27 downward toward the outer wall of the drive shaft 3, nitrogen can form an annular air curtain around the outer wall of the drive shaft 3 to block the backflow of external polluting gases.

[0033] Please refer to the above embodiments for further details. Figure 4 and Figure 8 A protective cover 8 is provided between the upper oil tank 1 and the fixed plate 9, and a first sealing ring 10 is provided between the protective cover 8 and the fixed plate 9. A second sealing ring 14 is provided between the feeding sleeve 13 and the sealing plate 15. A third sealing ring 16 is provided between the sealing plate 15 and the feeding sleeve 17. A fourth sealing ring 25 is provided between the interlayer sleeve 12 and the exhaust assembly 24. By providing the protective cover 8 and multiple sets of sealing rings, the sealing effect of the atomizer is improved, and the entry of external polluting gases into the atomizer is reduced.

[0034] Please refer to the above embodiments for further details. Figure 7 The bottom of the sealing plate 15 is provided with a rinsing plate 31. The rinsing plate 31 has multiple sets of drain holes 32. By providing the rinsing plate 31, the atomizing wheel 30 can be rinsed with water when the atomizer is disassembled and maintained. The side of the rinsing plate 31 is provided with a water inlet. The water flows into the rinsing plate 31 and is evenly dispersed through the multiple sets of drain holes 32, which can rinse the inside of the atomizing wheel 30.

[0035] Example 2: Please refer to Figures 9-12 The bottom of the exhaust assembly 24 is provided with an air intake assembly 33. The air intake assembly 33 includes a connecting sleeve 3301. The bottom of the connecting sleeve 3301 is provided with a conical sleeve 3302. Multiple sets of venturi tubes 3303 are provided on the outside of the conical sleeve 3302. By setting the air intake assembly 33, the external polluting gas can be reduced from actively approaching the annular air curtain.

[0036] Please refer to the above embodiments for further details. Figure 12The exhaust assembly 24 is provided with multiple exhaust channels 34, which are connected to multiple venturi tubes 3303 respectively. The thin tubes of the multiple venturi tubes 3303 are all connected to the inner side of the conical sleeve 3302. By utilizing the negative pressure suction principle of the venturi tubes 3303, it is possible to exhaust the gas while simultaneously drawing and transferring the specific external polluting gas.

[0037] Please refer to the above embodiments for further details. Figure 10 The top of the atomizing wheel 30 is provided with a third annular groove 35, and the bottom of the third annular groove 35 is provided with multiple sets of exhaust grooves 36. The multiple sets of exhaust grooves 36 are inclined towards the inner surface of the atomizing wheel 30. By setting the third annular groove 35 and multiple sets of exhaust grooves 36, the nitrogen in the annular air curtain can be guided into the interior of the atomizing wheel 30. Thus, when the atomizer stops working, the residual atomized aluminum oxide inside the atomizing wheel 30 is discharged as soon as possible, reducing the deposition of atomized aluminum oxide inside the atomizing wheel 30. At the same time, an air curtain is formed to cover the atomizing wheel 30, reducing the active approach of external polluting gases to the atomizing wheel 30.

[0038] Please refer to the above embodiments for further details. Figure 10 The third annular groove 35 corresponds to the exhaust gap 28, ensuring that the nitrogen in the annular air curtain can smoothly enter the third annular groove 35.

[0039] In practical operation, taking Example 1 as an example: When the atomizer in this application is in operation, the slurry of electrode materials such as alumina is conveyed into the feed pipe 19 by the material conveying equipment, then enters the spiral groove 20, then enters the discharge gap 18, and finally falls into the interior of the spiral groove 20. At the same time, the drive device 5 rotates and drives the transmission shaft 3 to rotate at high speed through the gearbox 4. The oil pump 6 and the oil tank unit 7 operate to circulate and filter the lubricating oil in the upper oil tank 1 and the lower oil tank 2. The high-speed rotation of the transmission shaft 3 drives the atomizing wheel 30 to rotate at high speed, thereby centrifugally atomizing the alumina slurry in the atomizing wheel 30. The atomized alumina is scattered around the atomizing wheel 30. At this time, the hot air distributor in the drying tower works to guide the hot air to mix with the atomized alumina, instantly removing the moisture from the atomized alumina, drying it into solid particles, and finally collecting them.

[0040] When the equipment encounters an unexpected situation, such as during maintenance shutdown, the nitrogen delivery system is activated first. Warm nitrogen enters the first annular groove 21, then enters the gas storage gap 23 through multiple sets of air inlets 22, and is then evenly blown into the exhaust gap 28, which is the outer wall of the drive shaft 3, through the second annular groove 26 and exhaust port 27, forming an annular air curtain. At this time, the driving device 5 of the drying tower and atomizer, as well as the material conveying equipment, are shut down. The annular air curtain maintains positive pressure, which can reduce the active backflow of slightly positive pressure air in the drying tower into the installation chamber of the drive shaft 3, and reduce the corrosion of oil seal assembly 29 and lubricating oil by dust and other substances in the drying tower.

[0041] During the maintenance process, the annular air curtain is continuously conveyed. The warm nitrogen can preheat the metal parts in the space where the gas storage gap 23 and the discharge gap 18 are located, reducing the condensation of humid air in the drying tower. It can also reduce the pre-condensation of gaseous slurry from the feed pipe 19, spiral groove 20 and discharge gap 18.

[0042] Taking Example 2 as an example: the atomization process of the alumina slurry is the same as in Example 1, except for the nitrogen supply. The nitrogen delivery system still delivers warm nitrogen to the first annular groove 21, and then through the air inlet 22 into the gas storage gap 23. The warm nitrogen in the gas storage gap 23 still has the function of preheating and preventing condensation. However, after the warm nitrogen enters the second annular groove 26, it is divided into two paths. One path of warm nitrogen enters the exhaust gap 28 through the exhaust port 27 to form an annular gas curtain, which is used to reduce gas backflow in the drying tower. The annular gas curtain blows towards the atomizing wheel 3. In the third annular groove 35 of 0, multiple sets of exhaust grooves 36 blow towards the inner surface of the atomizing wheel 30, which can reduce the condensation of residual atomized slurry in the atomizing wheel 30 on the inner surface of the atomizing wheel 30. That is to say, in the second embodiment, the annular air curtain blown out from the exhaust gap 28 is not only used to prevent the backflow of polluting gas from eroding, but also used to disperse the atomized slurry accumulated in the atomizing wheel 30. At the same time, since the annular air curtain is finally blown out from the periphery of the atomizing wheel 30, it can play a role in guiding and isolating the polluting gas in the drying tower, reducing the polluting gas in the drying tower from actively approaching the location of the atomizing wheel 30. Meanwhile, another stream of warm nitrogen gas is evenly distributed into multiple sets of venturi tubes 3303 through multiple sets of exhaust channels 34. When the warm nitrogen gas is blown out from the venturi tubes 3303, it can disperse the polluting gas in the space where the material discharge gap 18 is located. When the warm nitrogen gas flows through the thin tube of the venturi tube 3303, it forms a low negative pressure, which can draw away the polluting gas that has accumulated on the inner side of the conical sleeve 3302, that is, the outer side of the annular air curtain. In other words, the first stream of warm nitrogen gas is used to form an air curtain protection, and the second stream of warm nitrogen gas is used to reduce the polluting gas from actively approaching the annular air curtain, thereby further reducing the risk of the atomizer being contaminated by the gas in the drying tower.

[0043] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A closed-loop spray drying rotary atomizer, comprising a gearbox (4) and a drive unit (5), characterized in that: The gearbox (4) has an upper oil tank (1) at its bottom and a lower oil tank (2) at its bottom. A drive shaft (3) is installed inside both the upper and lower oil tanks (1) and at the bottom of the drive shaft (3). An atomizing wheel (30) is installed at the bottom of the drive shaft (3). The atomizing wheel (30) is connected to the drive shaft (3), gearbox (4), and drive device (5). A fixing plate (9) is installed at the bottom of the lower oil tank (2), and an inner bushing (11) is installed at the bottom of the fixing plate (9). The inner bushing (11) is rotatably connected to the drive shaft (3) by an oil seal assembly (29). An outer jacket (12) is provided outside the inner bushing (11), and a material conveying sleeve (13) is provided outside the outer jacket (12). A spiral groove (20) is provided at the bottom of the material conveying sleeve (13), and a sealing plate (15) is provided at the bottom of the material conveying sleeve (13). A discharge sleeve (17) is provided at the bottom of the sealing plate (15), and a discharge gap (18) is provided between the discharge sleeve (17) and the jacket (12). A fixing plate (9) is provided. A feed pipe (19) is provided at the top of the device. The feed pipe (19) is connected to an electrode slurry conveying device. The feed pipe (19) extends into the interior of the conveying sleeve (13) and communicates with the spiral groove (20). The spiral groove (20) is connected to the discharge gap (18). A first annular groove (21) is provided inside the conveying sleeve (13). Multiple sets of air inlets (22) are provided on the inner side of the jacket sleeve (12). An air storage gap (23) is provided between the jacket sleeve (12) and the inner liner sleeve (11). An exhaust assembly (24) is installed at the end of the jacket sleeve (12). The exhaust assembly (24) has a second annular groove (26) and multiple exhaust holes (27) on its side. An exhaust gap (28) is provided between the exhaust assembly (24) and the drive shaft (3). A nitrogen delivery system is connected to the first annular groove (21). The first annular groove (21) is connected to multiple air inlets (22), the gas storage gap (23), the second annular groove (26), the multiple exhaust holes (27), and the exhaust gap (28) in sequence.

2. The closed-loop spray drying rotary atomizer according to claim 1, characterized in that: The upper oil tank (1) and the lower oil tank (2) are equipped with lubricating oil for lubricating the drive shaft (3) and the gearbox (4), and an oil pump (6) and an oil tank unit (7) are provided above the upper oil tank (1).

3. The closed-loop spray drying rotary atomizer according to claim 2, characterized in that: The multiple sets of exhaust holes (27) are inclined and the multiple sets of exhaust holes (27) are inclined downward toward the outer wall of the drive shaft (3).

4. A closed-loop spray drying rotary atomizer according to claim 3, characterized in that: A protective cover (8) is provided between the upper oil tank (1) and the fixed plate (9), and a first sealing ring (10) is provided between the protective cover (8) and the fixed plate (9), a second sealing ring (14) is provided between the conveying sleeve (13) and the sealing plate (15), a third sealing ring (16) is provided between the sealing plate (15) and the unloading sleeve (17), and a fourth sealing ring (25) is provided between the interlayer sleeve (12) and the exhaust assembly (24).

5. A closed-loop spray drying rotary atomizer according to claim 4, characterized in that: The bottom of the sealing plate (15) is provided with a rinsing plate (31), and the rinsing plate (31) has multiple sets of drainage holes (32).

6. A closed-loop spray drying rotary atomizer according to claim 5, characterized in that: The bottom of the exhaust assembly (24) is provided with an air intake assembly (33), which includes a connecting sleeve (3301). The bottom of the connecting sleeve (3301) is provided with a conical sleeve (3302), and multiple sets of venturi tubes (3303) are provided on the outside of the conical sleeve (3302).

7. A closed-loop spray drying rotary atomizer according to claim 6, characterized in that: The exhaust assembly (24) is provided with multiple exhaust channels (34) inside. The multiple exhaust channels (34) are respectively connected to multiple venturi tubes (3303), and the thin tubes of the multiple venturi tubes (3303) are all connected to the inner side of the conical sleeve (3302).

8. A closed-loop spray drying rotary atomizer according to claim 7, characterized in that: The top of the atomizing wheel (30) is provided with a third annular groove (35), and the bottom of the third annular groove (35) is provided with multiple sets of exhaust grooves (36), which are inclined toward the inner surface of the atomizing wheel (30).

9. A closed-loop spray drying rotary atomizer according to claim 8, characterized in that: The third annular groove (35) corresponds to the exhaust gap (28).

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