A large vertical purification furnace

Abstract

This application relates to the technical field of graphite purification furnaces, and more particularly to a large vertical purification furnace, comprising a furnace body, a vacuum mechanism, a thermal reaction mechanism, and a flow-promoting mechanism. The furnace body has an air inlet assembly at its bottom and an exhaust assembly at its top. The vacuum mechanism is connected to the furnace body. The thermal reaction mechanism is located within the furnace body and communicates with the air inlet assembly; the thermal reaction mechanism is used to heat and store the graphite material to be purified. The flow-promoting mechanism includes a rotating component and a flow-promoting element. The rotating component is mounted on the furnace body, and the flow-promoting element is rotatably connected to the furnace body. One end of the flow-promoting element is connected to the rotating component, and the other end extends into the thermal reaction mechanism. The rotating component can drive the mixed gas to flow towards the exhaust assembly via the flow-promoting element. This application has the effect of reducing production costs.

Description

Technical Field

[0001] This application relates to the technical field of graphite purification furnaces, and in particular to a large vertical purification furnace. Background Technology

[0002] Currently, with the rapid development of modern industry, graphite materials, due to their excellent high-temperature resistance, corrosion resistance, and good electrical conductivity, have been widely used in various fields such as lithium batteries, nuclear fuel, and semiconductors. Especially in the semiconductor industry, the purity requirements for graphite materials are extremely high to ensure their stability and reliability under high-temperature environments. Therefore, the market demand for high-purity graphite products is increasing, placing higher demands on production efficiency and product quality.

[0003] In graphite purification technology, a common method is to remove impurities from graphite through a chemical reaction at high temperatures. Specifically, this process involves placing the graphite product in a crucible and introducing a mixture of Freon or chlorine and argon into the bottom of the crucible, causing the gas to escape from the top while maintaining the gas pressure within a certain range. This purification method effectively removes impurities from graphite, improving its purity. In related technologies, to ensure uniform dispersion of the Freon or chlorine and argon mixture within the crucible, multiple nozzles or diffuser plates are typically used, resulting in significant gas flow resistance. To overcome this resistance and remove impurities such as fluorides and chlorides after the reaction, the purification equipment usually requires a high gas flow rate to forcibly flush away the impurities.

[0004] Regarding the aforementioned technologies: forcibly flushing impurities by increasing the gas flow rate can easily lead to a large waste of gas, thereby increasing production costs. Summary of the Invention

[0005] To reduce production costs, this application provides a large-scale vertical purification furnace.

[0006] This application provides a large-scale vertical purification furnace, which adopts the following technical solution: A large vertical purification furnace includes: The furnace body has an air intake assembly at its bottom and an exhaust assembly at its top. The vacuum mechanism is connected to the furnace body; A thermal reaction mechanism is disposed inside the furnace and connected to the air inlet assembly. The thermal reaction mechanism is used to heat and store the graphite material to be purified. The flow-promoting mechanism includes a rotating component and a flow-promoting component. The rotating component is disposed on the furnace body, and the flow-promoting component is rotatably connected to the furnace body. One end of the flow-promoting component is connected to the rotating component, and the other end of the flow-promoting component extends into the thermal reaction mechanism. The rotating component can drive the mixed gas to flow to the exhaust assembly through the flow-promoting component.

[0007] By adopting the above technical solution, the rotating component can drive the flow-promoting component to rotate within the furnace, allowing the mixed gas to form a stable upward airflow inside the thermal reaction mechanism after entering from the inlet assembly. This design not only reduces gas flow resistance but also enables the gas to be more evenly distributed throughout the reaction zone, thereby improving reaction efficiency. Furthermore, the use of the flow-promoting mechanism effectively reduces the required gas flow rate, decreases gas consumption, and further reduces production costs. Combining these advantages, this invention can significantly improve gas utilization efficiency in the graphite purification process, shorten the production cycle, and increase the product qualification rate.

[0008] Optionally, the flow-promoting component includes a rotating shaft, a turntable, and multiple blades. One end of the rotating shaft is rotatably connected to the furnace body and connected to the rotating component. The other end of the rotating shaft extends into the thermal reaction mechanism and is connected to the turntable. The multiple blades are evenly distributed on the circumferential sidewall of the turntable around its axis.

[0009] By adopting the above technical solution, the rotating shaft transmits the power of the rotating components to the turntable, causing the turntable and its multiple blades to rotate synchronously. This design not only increases the gas flow rate but also ensures uniform gas diffusion throughout the reaction zone and reduces gas flow resistance. Simultaneously, the blade design allows the gas to be thoroughly stirred before entering the reaction zone, thereby better removing impurities and improving reaction efficiency. Furthermore, the uniform distribution of the blades avoids localized overheating, further enhancing the purification effect. Overall, this technical solution significantly improves the utilization efficiency of the reaction gas, reduces production costs, shortens the production cycle, and increases the product qualification rate.

[0010] Optionally, a trapezoidal groove is provided on the turntable corresponding to the position of the blade, and a trapezoidal block is provided on the blade. The trapezoidal block is inserted into the trapezoidal groove and fits against the inner wall of the trapezoidal groove.

[0011] By adopting the above technical solution, trapezoidal grooves are formed on the turntable corresponding to the positions of the blades, and trapezoidal blocks are set on the blades, which are inserted into the trapezoidal grooves and fit against the inner wall of the grooves. This design allows the blades to be firmly fixed on the turntable under high-temperature environments, while allowing for a certain degree of thermal expansion to avoid damage caused by temperature changes. The cooperation between the trapezoidal grooves and trapezoidal blocks also ensures that the blades will not loosen during high-speed rotation, thereby improving the stability and reliability of the entire system. In addition, this connection method facilitates assembly and maintenance, reducing production and maintenance costs.

[0012] Optionally, the thermal reaction mechanism includes a heating component, a crucible, a flow guide tube, and a gas dispersion plate. The heating component and the crucible are respectively disposed in the furnace body. The heating component is arranged around the crucible. The air inlet component and the air outlet component are respectively connected to the crucible. The gas dispersion plate is coaxially disposed in the crucible and has multiple gas dispersion holes. The flow guide tube is disposed on the gas dispersion plate and spaced apart from the circumferential inner wall of the crucible. The end of the flow-promoting component away from the rotating component extends to the bottom of the gas dispersion plate.

[0013] By adopting the above technical solution, the heating components are arranged around the crucible, ensuring uniform heat distribution and improving thermal efficiency. The graphite material to be purified can be placed on the gas diffuser plate. The multiple diffuser holes on the plate allow for more uniform gas dispersion upon entering the crucible, reducing local gas concentration differences and thus improving the uniformity and stability of the reaction between the mixed gas and the graphite material. The design of the guide tube further optimizes the gas flow path, ensuring a stable temperature and flow rate as the gas passes through the graphite material, avoiding poor purification results caused by uneven gas flow. The flow-promoting component extends below the gas diffuser plate, and the agitation generated by its rotation enhances the gas mixing effect, allowing the reactant gas to fully contact the graphite material, effectively improving the reaction rate and purification effect. In summary, this technical solution not only improves the utilization efficiency of the reactant gas but also significantly reduces production costs, shortens the production cycle, and increases the product qualification rate.

[0014] Optionally, the air intake assembly includes an air intake pipe and a ventilation support. The air intake pipe is disposed on the furnace body. One end of the ventilation support is connected to the crucible, and the other end of the ventilation support is connected to the air intake pipe. A ventilation hole is provided in the ventilation support. The ventilation hole communicates with the air intake pipe and the crucible respectively. The communication position between the ventilation hole and the crucible is located between the crucible and the guide tube.

[0015] By adopting the above technical solution, the combined design of the inlet pipe and the ventilation support allows the mixed gas to be directly introduced from outside the furnace body into the crucible, and the specific position of the gas entering the crucible can be precisely controlled. After the mixed gas enters the crucible, it reacts with the graphite material through the diffuser holes under the action of the flow-promoting component and flows towards the exhaust assembly. At this time, some gas can be discharged through the exhaust assembly, while the remaining gas can flow to the bottom of the crucible and mix with the newly entering gas to achieve preheating. This helps reduce the temperature difference of the gas flowing into the guide tube, thus reducing the possibility of uneven temperature distribution within the guide tube, and consequently improving the purification effect and reaction rate.

[0016] Optionally, the thermal reaction mechanism includes a heat insulation layer disposed between the heating component and the inner wall of the furnace.

[0017] By adopting the above technical solution, the insulation layer is placed between the heating component and the inner wall of the furnace, effectively reducing heat loss to the outside of the furnace and improving the temperature uniformity and stability inside the furnace. This not only reduces energy consumption but also ensures that the graphite material is heated more evenly during the purification process, thereby improving purification efficiency and product quality. At the same time, the insulation layer also protects the inner wall of the furnace from high-temperature erosion, extending the service life of the equipment.

[0018] Optionally, the exhaust assembly includes an exhaust pipe, a sleeve, and multiple baffles. The exhaust pipe is disposed at the top of the furnace body, one end of the exhaust pipe extends into the thermal reaction mechanism, and the other end of the exhaust pipe extends out of the furnace body. The sleeve is coaxially disposed inside the exhaust pipe, and the multiple baffles are distributed sequentially along the axial direction of the sleeve, with adjacent baffles staggered.

[0019] By adopting the above technical solution, multiple baffles inside the exhaust pipe are sequentially distributed along the axial direction of the sleeve, with adjacent baffles staggered. This forces the gas to change its flow direction multiple times during the exhaust process, increasing the gas path length. This design not only effectively slows down the gas flow rate but also increases the chance of impurities such as fluorides and chlorides in the gas depositing inside the exhaust pipe, thereby reducing the possibility of these impurities entering the subsequent treatment system. Furthermore, this design helps to evenly distribute the gas flow, ensuring more stable gas temperature and composition, which contributes to improved purification efficiency and production efficiency.

[0020] Optionally, a lifting mechanism is included. The furnace body includes a main body and a furnace bottom. The furnace bottom is detachably connected to the main body. The exhaust assembly is disposed on the top of the main body. The vacuum mechanism is connected to the main body. The thermal reaction mechanism, the flow-promoting mechanism, and the air intake assembly are respectively disposed on the furnace bottom. The lifting mechanism is connected to the furnace bottom and is used to drive the furnace bottom closer to or away from the main body.

[0021] By adopting the above technical solution, the connection between the lifting mechanism and the furnace bottom allows the furnace bottom to move vertically, enabling operations to move the furnace bottom closer to or further away from the main body. This design not only facilitates the loading and unloading of the furnace bottom but also improves operational safety and convenience. When it is necessary to replace or repair the thermal reaction mechanism, flow-promoting mechanism, and gas inlet components on the furnace bottom, the furnace bottom can be lowered via the lifting mechanism, making it easier for personnel to access and handle these components. Simultaneously, the separate design of the furnace bottom reduces the overall weight of the equipment, lowers the difficulty of handling, and further improves maintenance efficiency. Furthermore, by adjusting the height of the furnace bottom, purification operations can be performed under different height conditions, optimizing the gas flow path, ensuring uniform gas distribution within the reaction area, and improving the purification effect.

[0022] Optionally, the vacuum mechanism includes a vacuum pipe, a vacuum pump assembly, and a filter tank. The vacuum pipe is connected to the furnace body and the vacuum pump assembly, respectively, and the filter tank is disposed on the vacuum pipe and close to the furnace body.

[0023] By adopting the above technical solution, the vacuum pipeline ensures the smooth extraction of gas from the furnace, maintaining stable internal pressure and preventing leaks or safety accidents caused by pressure fluctuations. Simultaneously, the powerful suction provided by the vacuum pump unit not only facilitates the rapid removal of reacted gases but also promotes the replenishment of fresh reactant gases, thereby improving the utilization efficiency of the reactant gases. The filter tank further purifies the gas discharged from the furnace, removing impurities such as fluorides and chlorides, preventing these harmful substances from polluting the environment and protecting subsequent processing equipment from corrosion and damage. This design not only meets environmental protection requirements but also extends the service life of the equipment and reduces maintenance costs.

[0024] Optionally, the vacuum pipeline includes a first pipeline, a second pipeline, and a slow-extraction pipeline. One end of the first pipeline is connected to the furnace body, and the other end of the first pipeline is connected to the second pipeline. A filter tank is disposed on the first pipeline. The end of the second pipeline away from the first pipeline is connected to the vacuum pump group. A main valve is disposed between the first pipeline and the second pipeline. The slow-extraction pipeline is connected to both the first pipeline and the second pipeline, and a slow-extraction valve is disposed on the slow-extraction pipeline.

[0025] By adopting the above technical solution, the main valve installed between the first and second pipelines can quickly close or open when rapid adjustment of the furnace pressure is required, thereby ensuring the stability of the furnace pressure. Simultaneously, the slow-extraction valve on the slow-extraction pipeline allows for slow gas extraction under low pressure, avoiding a sudden drop in furnace pressure caused by rapid gas extraction and preventing damage to the internal structure of the furnace. This design not only improves system safety but also optimizes gas flow management during the purification process, reduces gas waste, and improves purification efficiency. Furthermore, by rationally configuring the various pipelines and valves, the furnace atmosphere can be more precisely adjusted, further improving the purity and quality of the product.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. Through the cooperation of the rotating component and the flow-promoting component, the mixed gas can form a stable upward airflow after entering the thermal reaction mechanism, thereby effectively reducing the gas consumption and increasing the gas flow rate. In addition, the flow-promoting component can stir the mixed gas, making the mixed gas distribution more uniform, which is conducive to improving the gas utilization rate and further reducing the production cost. 2. Through the cooperation of the crucible, guide tube, gas diffuser, gas inlet pipe and ventilation support, the mixed gas can fully react with the graphite material in the guide tube, and part of the gas after reaction can be discharged through the exhaust component, while the remaining gas can flow to the bottom of the crucible and mix with the gas newly entering the crucible, so as to preheat the new mixed gas, thereby reducing the temperature difference in the guide tube and thus improving the purification effect and reaction rate. 3. Through the cooperation of the exhaust pipe, sleeve and multiple baffles, the gas is forced to change its flow direction multiple times during the exhaust process, which increases the gas path length and thus effectively slows down the gas flow rate. This increases the chance of impurities such as fluorides and chlorides in the gas depositing inside the exhaust pipe, thereby reducing the possibility of impurities entering the subsequent treatment system. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a large vertical purification furnace according to an embodiment of this application.

[0028] Figure 2 This is a partial structural cross-sectional view of the thermal reaction mechanism in the embodiments of this application.

[0029] Figure 3 This is a cross-sectional view of the rotating component in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the flow-promoting component in an embodiment of this application.

[0031] Figure 5 This is a cross-sectional view of the exhaust assembly in an embodiment of this application.

[0032] Explanation of reference numerals in the attached figures: 1. Furnace body; 11. Main body; 12. Furnace bottom; 13. Exhaust assembly; 131. Exhaust pipe; 132. Sleeve; 133. Baffle; 14. Inlet assembly; 141. Inlet pipe; 142. Ventilation support; 1421. Ventilation hole; 2. Vacuum mechanism; 21. Vacuum pipeline; 211. First pipeline; 212. Second pipeline; 213. Slow-extraction pipeline; 214. Main valve; 215. Slow-extraction valve; 22. Vacuum pump assembly; 23. Filter tank; 3. Thermal reaction mechanism; 31. Heating component 32. Crucible; 33. Flow guide tube; 34. Gas diffuser plate; 341. Support column; 342. Gas diffuser hole; 35. Insulation layer; 4. Flow promotion mechanism; 41. Rotating component; 411. Mounting base; 412. Magnetohydrodynamic element; 413. Servo geared motor; 414. Pulley; 415. Belt; 416. Rotary joint; 42. Flow promotion component; 421. Rotating shaft; 422. Turntable; 4221. Trapezoidal groove; 423. Blade; 4231. Trapezoidal block; 5. Stand; 6. Lifting mechanism. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0034] This application discloses a large vertical purification furnace.

[0035] It should be noted that, in the description of this invention, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Reference Figure 1 A large vertical purification furnace includes a furnace body 1, a vacuum mechanism 2, a thermal reaction mechanism 3, a flow-promoting mechanism 4, and a support platform 5. The furnace body 1 is mounted on the support platform 5. The vacuum mechanism 2 is located beside the support platform 5 and communicates with the furnace body 1. The thermal reaction mechanism 3 is located inside the furnace body 1. The flow-promoting mechanism 4 is located on the furnace body 1 and extends into the thermal reaction mechanism 3. The flow-promoting mechanism 4 promotes the flow of the mixed gas within the thermal reaction mechanism 3, thereby reducing the required gas flow rate, reducing gas consumption, and thus lowering production costs. It should be noted that in this embodiment, the mixed gas refers to a mixture of Freon or chlorine and argon.

[0037] The furnace body 1 includes a main body 11 and a furnace bottom 12. The main body 11 is mounted on a support 5, the vacuum mechanism 2 is connected to the main body 11, the furnace bottom 12 is detachably connected to the main body 11 and located at the bottom of the main body 11, and the thermal reaction mechanism 3 and the flow-promoting mechanism 4 are respectively mounted on the furnace bottom 12.

[0038] A large vertical purification furnace also includes a lifting mechanism 6, which is mounted on a frame 5 and fixedly connected to the furnace bottom 12. In this embodiment, the lifting mechanism 6 adopts a motion mode of optical axis guidance, lead screw rotation, and nut lifting. It is powered by a motor, worm gear reducer, commutator, and transmission shaft, which facilitates the use of the lifting mechanism 6 to drive the furnace bottom 12 closer to or away from the main body 11, thereby facilitating the loading and unloading of the furnace bottom 12.

[0039] An exhaust assembly 13 is installed on the top of the main body 11, and an air intake assembly 14 is installed on the bottom of the furnace 12. The exhaust assembly 13 and the air intake assembly 14 are respectively connected to the thermal reaction mechanism 3, so as to facilitate the use of the air intake assembly 14 to transport mixed gas into the thermal reaction mechanism 3, and to facilitate the use of the exhaust assembly 13 to discharge the gas after reaction from the main body 11.

[0040] In other embodiments, a furnace cover is detachably connected to the main body 11, and an exhaust assembly 13 is installed on the furnace cover to facilitate the inspection and cleaning of various components inside the main body 11.

[0041] Reference Figure 1 and Figure 2 The air intake assembly 14 includes an air intake pipe 141 and a ventilation bracket 142. The air intake pipe 141 is mounted on the furnace bottom 12, and the ventilation bracket 142 is mounted on the side of the furnace bottom 12 near the main body 11 and connected to the air intake pipe 141. A ventilation hole 1421 is provided through the ventilation bracket 142 along its length, and the ventilation hole 1421 communicates with the air intake pipe 141. In this embodiment, multiple sets of air intake assemblies 14 are provided, and these sets are evenly distributed on the furnace bottom 12.

[0042] The thermal reaction mechanism 3 includes a heating element 31, a crucible 32, a guide tube 33, a gas dissipation plate 34, and a heat insulation layer 35. The heating element 31 and the heat insulation layer 35 are respectively installed inside the main body 11, with the heat insulation layer 35 positioned between the heating element 31 and the inner wall of the main body 11. This effectively reduces heat loss to the outside of the main body 11 and improves the temperature uniformity and stability inside the main body 11. In this embodiment, the heating element 31 is an isostatic graphite heater, and the heat insulation layer 35 is a carbon felt heat insulation layer.

[0043] The crucible 32 is fixedly connected to multiple ventilation supports 142, allowing the supports 142 to work together to support the crucible 32 and prevent it from shaking. Furthermore, carbon fiber packing is used as a sealing ring on the crucible 32 to prevent leakage of high-temperature gas inside.

[0044] The vent 1421 is connected to the crucible 32, allowing the mixed gas to enter the crucible 32 through the inlet pipe 141 and the vent 1421, so that the mixed gas can react with the graphite material to be purified inside the crucible 32. Furthermore, the heating element 31 is arranged around the crucible 32 to ensure uniform heat distribution and improve thermal efficiency.

[0045] Reference Figure 2 The gas dispersion plate 34 is coaxially disposed inside the crucible 32, and a support column 341 is fixedly connected between the gas dispersion plate 34 and the crucible 32. The support column 341 is used to support the gas dispersion plate 34 and to create a gap between the gas dispersion plate 34 and the bottom wall of the crucible 32 so that the mixed gas can pass through the gas dispersion plate 34. In other embodiments, the support column 341 may be omitted, and a connecting rod may be used to suspend and fix the gas dispersion plate 34 on the crucible 32.

[0046] In this embodiment, the gas dispersion plate 34 is provided with a plurality of gas dispersion holes 342, which are evenly distributed on the gas dispersion plate 34, so that the gas can be more evenly dispersed when entering the crucible 32, reducing the local gas concentration difference. The gas dispersion plate 34 is used to support the graphite material to be purified, thereby improving the uniformity and stability of the reaction between the mixed gas and the graphite material.

[0047] The guide tube 33 is mounted on the gas distribution plate 34 and spaced apart from the circumferential inner wall of the crucible 32. The top of the guide tube 33 is also spaced apart from the top of the crucible 32. The vent hole 1421 communicates with the crucible 32 between the crucible 32 and the guide tube 33. This allows some gas to flow from the guide tube 33 to the top of the crucible 32 and then flow through the space between the guide tube 33 and the inner wall of the crucible 32 towards the bottom of the crucible 32. During this process, because the temperature between the guide tube 33 and the crucible 32 is higher than the temperature at the bottom of the crucible 32, some impurities such as fluorides and chlorides in the gas will deposit on the bottom of the crucible 32 and the flow-promoting component 42, and will no longer enter the guide tube 33.

[0048] Reference Figure 1 The flow-promoting mechanism 4 includes a rotating component 41 and a flow-promoting component 42. The rotating component 41 is mounted on the furnace bottom 12, and the flow-promoting component 42 is rotatably connected to the furnace bottom 12. One end of the flow-promoting component 42 is connected to the rotating component 41, and the other end of the flow-promoting component 42 extends to the bottom of the gas distribution plate 34.

[0049] Reference Figure 1 and Figure 3In this embodiment, the rotating component 41 includes a mounting base 411, a magnetic fluid element 412, a servo geared motor 413, a pulley 414, a belt 415, and a rotary joint 416. The mounting base 411 is fixedly connected to the furnace bottom 12. One end of the magnetic fluid element 412 is rotatably connected to the furnace bottom 12 and extends to the side of the furnace bottom 12 near the main body 11. The other end of the magnetic fluid element 412 is rotatably connected to the mounting base 411. The function of the magnetic fluid element 412 is to transmit torque while maintaining a seal.

[0050] Rotary joint 416 is mounted on mounting base 411 and communicates with magnetofluid element 412. Rotary joint 416 is used to communicate with external cooling water supply equipment so as to provide cooling water to the rotating shaft inside magnetofluid element 412.

[0051] It should be noted that the specific structural design of the magnetofluid element 412 in this embodiment is a conventional technical means for those skilled in the art, and therefore will not be described in detail in this embodiment.

[0052] The servo geared motor 413 is mounted on the mounting base 411. The pulley 414 is rotatably connected to the mounting base 411 and coaxially fixedly connected to the magnetohydrodynamic element 412. The belt 415 is connected to the servo geared motor 413 and the pulley 414 respectively, so that the servo geared motor 413 can drive the pulley 414 to rotate through the belt 415.

[0053] Reference Figure 1 and Figure 4 The flow-promoting component 42 includes a rotating shaft 421, a rotating disk 422, and multiple blades 423. The rotating shaft 421 is rotatably connected to the furnace bottom 12, with one end extending below the diffuser plate 34 and connected to the rotating disk 422. The other end of the rotating shaft 421 is connected to the magnetohydrodynamic element 412 (see reference). Figure 3 The components are fitted with conical surfaces to facilitate loading and unloading.

[0054] In this embodiment, the rotating shaft 421 and the turntable 422 are fitted with a shaft hole, and a locating pin and a locating screw are provided at the shaft hole to ensure the connection stability between the rotating shaft 421 and the turntable 422. In this embodiment, the rotating shaft 421, the turntable 422, and the blade 423 are all made of carbon fiber packing material.

[0055] Multiple blades 423 are evenly distributed around the axis of the turntable 422 on the circumferential sidewall of the turntable 422. A trapezoidal groove 4221 is provided on the turntable 422 corresponding to the position of the blades 423. A trapezoidal block 4231 is integrally formed on the blade 423. The trapezoidal block 4231 is inserted into the trapezoidal groove 4221 and fits against the inner wall of the trapezoidal groove 4221. This allows the blades 423 to be firmly fixed on the turntable 422 in a high-temperature environment, while allowing a certain amount of thermal expansion to avoid damage caused by temperature changes. At the same time, it ensures that the blades 423 will not loosen when rotating at high speed.

[0056] In this embodiment, the end of the blade 423 away from the turntable 422 is provided with a rounded corner to reduce eddy current interference. In other embodiments, the rounded corner can be replaced with a chamfer.

[0057] Reference Figure 1 and Figure 4 When the mixed gas enters the crucible 32, the rotating component 41 can drive the rotating shaft 421 to rotate, and the rotating shaft 421 can drive the blades 423 to rotate through the turntable 422, so that the blades 423 drive the mixed gas to the gas dispersing hole 342 (see reference). Figure 2 The internal flow facilitates the increase of gas flow rate, thereby better removing impurities. The blades 423 can also be used to stir the mixed gas, thereby improving the uniformity of gas mixing and making it easier for the mixed gas to fully react with the graphite material, thus improving the purification effect.

[0058] Reference Figure 1 and Figure 5 The exhaust assembly 13 includes an exhaust pipe 131, a sleeve 132, and multiple baffles 133. The exhaust pipe 131 is mounted on the top of the main body 11, with one end extending into the crucible 32 and the other end extending out of the main body 11. The sleeve 132 is coaxially disposed inside the exhaust pipe 131, and the sleeve 132 is detachably connected to the exhaust pipe 131, facilitating cleaning and maintenance of the sleeve 132. In this embodiment, the exhaust pipe 131 is made of graphite material.

[0059] Multiple baffles 133 are distributed sequentially along the axial direction of the sleeve 132. In this embodiment, the baffles 133 have crescent-shaped openings, and the openings on adjacent baffles 133 are staggered. This allows the gas entering the exhaust pipe 131 to be blocked by the baffles 133, forcing the gas to change its flow direction multiple times during the exhaust process, thus increasing the gas path length. This design not only effectively slows down the gas flow rate but also increases the chance of impurities such as fluorides and chlorides in the gas depositing inside the exhaust pipe 131, thereby reducing the possibility of these impurities entering the subsequent treatment system. In other embodiments, the baffles 133 can also be designed as semi-circular, with adjacent baffles 133 staggered.

[0060] Since the end of the exhaust pipe 131 that is away from the crucible 32 extends outside the main body 11, the temperature of the ends of the exhaust pipe 131 and the sleeve 132 that extend outside the main body 11 is relatively low. As a result, when the gas enters the exhaust pipe 131 and slows down and cools down, some of the impurities such as fluorides and chlorides carried in the gas will be deposited in the sleeve 132, so that the impurities can be cleaned.

[0061] Reference Figure 1 The vacuum mechanism 2 includes a vacuum pipe 21, a vacuum pump assembly 22, and a filter tank 23. The vacuum pipe 21 is connected to both the main body 11 and the vacuum pump assembly 22. The filter tank 23 is mounted on the vacuum pipe 21 and positioned close to the furnace body 1. Thus, when the vacuum pump assembly 22 evacuates the furnace body 1 through the vacuum pipe 21, impurities such as fluorides and chlorides carried in the gas can be filtered by the filter tank 23.

[0062] The vacuum pipeline 21 includes a first pipeline 211, a second pipeline 212, and a slow-extraction pipeline 213. One end of the first pipeline 211 is connected to the main body 11, and the other end of the first pipeline 211 is connected to the second pipeline 212. A filter tank 23 is installed on the first pipeline 211. The end of the second pipeline 212 away from the first pipeline 211 is connected to the vacuum pump unit 22. A main valve 214 is installed between the first pipeline 211 and the second pipeline 212. When it is necessary to quickly adjust the pressure inside the furnace, the main valve 214 can be quickly closed or opened to allow the vacuum pump unit 22 to draw gas from the furnace, thereby ensuring the stability of the pressure inside the furnace.

[0063] The slow-extraction pipe 213 is connected to the first pipe 211 and the second pipe 212 respectively. A slow-extraction valve 215 is installed on the slow-extraction pipe 213, so that the vacuum pump group 22 can slowly extract gas under low pressure, avoiding a sudden drop in furnace pressure caused by rapid gas extraction and preventing damage to the internal structure of the furnace body 1. In this embodiment, the diameter of the slow-extraction pipe 213 is smaller than the diameter of the first pipe 211 and the second pipe 212.

[0064] It should be noted that the specific structure and working principle of the vacuum pump unit 22 are conventional technical means for those skilled in the art, and therefore will not be described in detail in the embodiments of this application.

[0065] The implementation principle of a large vertical purification furnace according to an embodiment of this application is as follows: When it is necessary to purify graphite materials, the graphite materials are first placed on the gas distribution plate 34, and then the vacuum pump group 22 is used to evacuate the main body 11. The heating component 31 is started to heat the temperature inside the furnace body 1 to the specified value.

[0066] Next, the mixed gas is introduced into the vent 1421 through the inlet pipe 141, and then enters the crucible 32 through the vent 1421. Simultaneously, the rotating component 41 drives the blades 423 to rotate via the shaft 421 and the turntable 422. The blades 423 drive the mixed gas to flow into the diffuser 342, ensuring that the mixed gas fully reacts with the graphite material. The reacted mixed gas then flows towards the top of the crucible 32 under the constraint of the guide tube 33. At this point, some of the gas is discharged through the exhaust pipe 131, while the remaining gas flows towards the bottom of the crucible 32 through the gap between the guide tube 33 and the crucible 32, mixes with the newly introduced mixed gas, and then re-enters the guide tube 33 through the diffuser 342, thus achieving continuous purification of the graphite material.

[0067] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A large vertical purification furnace, characterized in that, include: Furnace body (1), with an air intake assembly (14) at the bottom and an exhaust assembly (13) at the top. Vacuum mechanism (2) is connected to the furnace body (1); A thermal reaction mechanism (3) is installed inside the furnace body (1) and connected to the air inlet assembly (14). The thermal reaction mechanism (3) is used to heat and store the graphite material to be purified. The flow-promoting mechanism (4) includes a rotating component (41) and a flow-promoting component (42). The rotating component (41) is disposed on the furnace body (1), and the flow-promoting component (42) is rotatably connected to the furnace body (1). One end of the flow-promoting component (42) is connected to the rotating component (41), and the other end of the flow-promoting component (42) extends into the thermal reaction mechanism (3). The rotating component (41) can drive the mixed gas to flow to the exhaust assembly (13) through the flow-promoting component (42).

2. The large vertical purification furnace according to claim 1, characterized in that: The flow-promoting component (42) includes a rotating shaft (421), a turntable (422), and multiple blades (423). One end of the rotating shaft (421) is rotatably connected to the furnace body (1) and connected to the rotating component (41). The other end of the rotating shaft (421) extends into the thermal reaction mechanism (3) and is connected to the turntable (422). The multiple blades (423) are evenly distributed around the axis of the turntable (422) on the circumferential sidewall of the turntable (422).

3. The large vertical purification furnace according to claim 2, characterized in that: The turntable (422) has a trapezoidal groove (4221) at the position corresponding to the blade (423), and a trapezoidal block (4231) is provided on the blade (423). The trapezoidal block (4231) is inserted into the trapezoidal groove (4221) and fits against the inner wall of the trapezoidal groove (4221).

4. The large vertical purification furnace according to claim 1, characterized in that: The thermal reaction mechanism (3) includes a heating component (31), a crucible (32), a guide tube (33), and a gas dispersing plate (34). The heating component (31) and the crucible (32) are respectively disposed inside the furnace body (1). The heating component (31) is arranged around the crucible (32). The air inlet component (14) and the exhaust component (13) are respectively connected to the crucible (32). The gas dispersing plate (34) is coaxially disposed inside the crucible (32). The gas dispersing plate (34) is provided with a plurality of gas dispersing holes (342). The guide tube (33) is disposed on the gas dispersing plate (34) and is spaced apart from the circumferential inner wall of the crucible (32). The end of the flow-promoting component (42) away from the rotating component (41) extends to the bottom of the gas dispersing plate (34).

5. The large vertical purification furnace according to claim 4, characterized in that: The air intake assembly (14) includes an air intake pipe (141) and a ventilation bracket (142). The air intake pipe (141) is disposed on the furnace body (1). One end of the ventilation bracket (142) is connected to the crucible (32), and the other end of the ventilation bracket (142) is connected to the air intake pipe (141). A ventilation hole (1421) is provided in the ventilation bracket (142). The ventilation hole (1421) is connected to the air intake pipe (141) and the crucible (32) respectively. The connection position between the ventilation hole (1421) and the crucible (32) is located between the crucible (32) and the guide tube (33).

6. The large vertical purification furnace according to claim 4, characterized in that: The thermal reaction mechanism (3) includes a heat insulation layer (35), which is disposed between the heating component (31) and the inner wall of the furnace body (1).

7. The large vertical purification furnace according to claim 1, characterized in that: The exhaust assembly (13) includes an exhaust pipe (131), a sleeve (132), and multiple baffles (133). The exhaust pipe (131) is located at the top of the furnace body (1). One end of the exhaust pipe (131) extends into the thermal reaction mechanism (3), and the other end of the exhaust pipe (131) extends out of the furnace body (1). The sleeve (132) is coaxially arranged inside the exhaust pipe (131). Multiple baffles (133) are distributed sequentially along the axial direction of the sleeve (132), and adjacent baffles (133) are staggered.

8. The large vertical purification furnace according to claim 1, characterized in that: The furnace body (1) includes a lifting mechanism (6), a main body (11) and a furnace bottom (12), the furnace bottom (12) is detachably connected to the main body (11), the exhaust assembly (13) is disposed on the top of the main body (11), the vacuum mechanism (2) is connected to the main body (11), the thermal reaction mechanism (3), the flow-promoting mechanism (4) and the air intake assembly (14) are respectively disposed on the furnace bottom (12), the lifting mechanism (6) is connected to the furnace bottom (12), and the lifting mechanism (6) is used to drive the furnace bottom (12) to move closer to or away from the main body (11).

9. The large vertical purification furnace according to claim 1, characterized in that: The vacuum mechanism (2) includes a vacuum pipe (21), a vacuum pump group (22) and a filter tank (23). The vacuum pipe (21) is connected to the furnace body (1) and the vacuum pump group (22) respectively. The filter tank (23) is set on the vacuum pipe (21) and close to the furnace body (1).

10. The large vertical purification furnace according to claim 9, characterized in that: The vacuum pipeline (21) includes a first pipeline (211), a second pipeline (212), and a slow-extraction pipeline (213). One end of the first pipeline (211) is connected to the furnace body (1), and the other end of the first pipeline (211) is connected to the second pipeline (212). A filter tank (23) is installed on the first pipeline (211). The end of the second pipeline (212) away from the first pipeline (211) is connected to the vacuum pump group (22). A main valve (214) is installed between the first pipeline (211) and the second pipeline (212). The slow-extraction pipeline (213) is connected to the first pipeline (211) and the second pipeline (212) respectively. A slow-extraction valve (215) is installed on the slow-extraction pipeline (213).

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