A new type of stirring paddle mechanism

Abstract

The application discloses a novel stirring paddle mechanism suitable for a silicon-carbon negative electrode material chemical vapor deposition reactor. The device forms a gas cavity in the inside of a cap-shaped paddle, and sets a first distributor and a second distributor to discharge gas, so that the spiral rising of the gas flow and the fluidization of the bottom material are realized. The first gas distributor serves as a main gas outlet, and forms the spiral gas flow upward in the reactor along with the rotation of the cap-shaped paddle, forms turbulent flow or forced convection, reduces the local concentration difference of the gas, improves the contact efficiency of the gas and the composite material, and thus improves the uniformity of the material coating. The second gas distributor serves as an auxiliary gas path, and blows the material near the stirring base plate, so that the bottom accumulation area (dead material area) is effectively eliminated. The cylindrical shell of the cap-shaped paddle wraps the stirring shaft in the inside gas cavity, effectively prevents the composite material from entering the stirring shaft area, and avoids the sticking, wear or operation failure of the traditional stirring shaft caused by the material accumulation from the source.

Description

Technical Field

[0001] This application relates to the field of stirring mechanism technology, and specifically to a novel stirring blade mechanism. Background Technology

[0002] Silicon-carbon anode materials (Si / C) are one of the key materials for lithium-ion batteries, and their preparation process has a decisive impact on battery performance (such as capacity, cycle life, and rate performance). Chemical vapor deposition (CVD) is widely used for the coating modification, nanostructure construction, and uniform composite of silicon-carbon anode materials, and the design of the stirring mechanism is one of the core technologies for achieving efficient and uniform CVD processes.

[0003] Currently, traditional stirring mechanisms have insufficient contact with the reactor interior, which can easily lead to stirring "dead zones." Insufficient stirring results in uneven distribution of reactants, affecting the uniform deposition of composite materials. Furthermore, the stirring action of traditional stirring mechanisms may disrupt the gas flow path within the reaction chamber, causing local gas stagnation or incomplete reaction, resulting in uneven local gas concentrations, difficulty in eliminating temperature stratification, inconsistent deposition rates, and affecting deposition uniformity, leading to uneven coating thickness on the material surface. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this application is to provide a novel stirring blade mechanism to solve the problems mentioned in the background art.

[0005] According to one aspect of this application, a novel stirring impeller mechanism is disposed on a reactor stirring chassis, comprising a cap-type impeller, a stirring shaft, a sleeve, a first gas distributor, and a second gas distributor. A through hole is formed in the center of the stirring chassis, and a sleeve is sealed and fixedly disposed at the through hole, extending through the stirring chassis. An stirring shaft is axially disposed on the sleeve, extending through both ends of the sleeve and rotatably and sealingly connected to them. The bottom end of the stirring shaft is fixedly connected to an external motor, and the top end of the stirring shaft is fixedly connected to the cap-type impeller. The rotation direction of the stirring shaft is opposite to the rotation direction of the cap-type impeller, and the cap-type impeller is covered by the sleeve. The upper end and bottom of the sleeve have a gap with the upper surface of the stirring base. An air cavity is formed between the inside of the cap-shaped blade and the upper end of the sleeve. A first gas distributor is provided on the outer wall of the cap-shaped blade. The inner side of the first gas distributor is connected to the air cavity and its outer side faces the inside of the reactor. A second gas distributor is provided at the bottom of the cap-shaped blade. The inner side of the second gas distributor is connected to the air cavity and its outer side faces the upper surface of the stirring base. An air inlet is opened on the side wall of the sleeve inside the cap-shaped blade. An air source interface is provided on the side wall of the sleeve below the stirring base. The air source interface is connected to an external air supply device.

[0006] Preferably, the cap-type impeller includes a cylindrical cover and impeller blades. The top of the cylindrical cover is a closed structure and its bottom is an open structure. An internal threaded hole is opened at the center of the top of the inner side of the cylindrical cover. An external thread is opened on the outer wall of the top of the stirring shaft. The top of the stirring shaft is fixedly connected to the cylindrical cover by threading with the internal threaded hole. Multiple impeller blades are fixedly fixed at equal intervals along the circumference of the outer wall of the cylindrical cover. The upper end of the sleeve passes through the bottom opening of the cylindrical cover and is disposed inside the cylindrical cover. The inner wall of the cylindrical cover and the upper end of the sleeve form the air cavity.

[0007] Preferably, the first gas distributor includes multiple gas outlet pipes. Multiple gas outlet pipes are evenly and equidistantly fixed on the outer wall of the cylindrical cover along its circumference. Each gas outlet pipe is connected to the gas chamber, and the outer port of each gas outlet pipe is set obliquely upward.

[0008] Preferably, there is a first gap between the inner wall of the cylindrical cover and the outer wall of the sleeve, and a second gap between the bottom opening of the cylindrical cover and the upper surface of the stirring base. The first gap and the second gap are connected to the air cavity, and the air path formed by the first gap and the second gap constitutes the second gas distributor.

[0009] Preferably, the bottom opening edge of the cylindrical cover is chamfered inward.

[0010] Preferably, there is a gap between the bottom of each blade and the upper surface of the mixing base.

[0011] Preferably, the axis of the stirring shaft coincides with the axis of the sleeve, and the stirring shaft and the sleeve are connected by a sealed bearing for rotational sealing.

[0012] The advantages of this application compared with the prior art are as follows: This application provides a novel stirring blade mechanism that, by forming an air cavity inside the cap-shaped blade and utilizing the reasonable layout and rotational coordination of the first and second gas distributors, can generate a spiral upward airflow within the reactor, thereby achieving uniform fluidization of the composite material. The first gas distributor, as the main air outlet, forms a spiral upward airflow within the reactor as the cap-shaped blade rotates, creating turbulence or forced convection, reducing local gas concentration differences, and improving the contact efficiency between the gas and the composite material, thus enhancing the uniformity of material coating. The second gas distributor, as an auxiliary air path, purges materials near the stirring base, effectively eliminating the bottom accumulation zone (dead material zone). The cylindrical casing of the cap-shaped blade encloses the stirring shaft within the internal air cavity, effectively preventing the composite material from entering the stirring shaft area, thus avoiding jamming, wear, or operational failures caused by material accumulation in traditional stirring shafts. Attached Figure Description

[0013] Figure 1 This is a perspective view of a novel stirring blade mechanism according to an embodiment of this application.

[0014] Figure 2 This is a cross-sectional structural schematic diagram of a novel stirring blade mechanism according to an embodiment of this application.

[0015] Reference numerals: 1. Cap-type impeller; 11. Cylindrical casing; 12. Impeller blade; 2. Stirring shaft; 3. Sleeve; 4. First gas distributor; 41. Gas outlet pipe; 5. Second gas distributor; 51. First gap; 52. Second gap; 6. Stirring base; 7. Gas chamber; 8. Air inlet; 9. Gas source interface. Detailed Implementation

[0016] To make the content of this application easier to understand, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the accompanying drawings. Figure 2 In this context, the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. Furthermore, terms such as "first," "second," etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0017] like Figure 1 and Figure 2As shown, a novel stirring impeller mechanism is mounted on a reactor stirring base 6, including a cap-type impeller 1, a stirring shaft 2, a sleeve 3, a first gas distributor 4, and a second gas distributor 5. A through hole is formed in the center of the stirring base 6, and a sleeve 3 is sealed and fixed at the through hole, penetrating the stirring base 6. The stirring shaft 2 is axially mounted on the sleeve 3, passing through both ends of the sleeve 3 and connected to it via a sealed bearing. The axis of the stirring shaft 2 coincides with the axis of the sleeve 3. The bottom end of the stirring shaft 2 is fixedly connected to an external motor to drive its rotation, and the top end of the stirring shaft 2 is fixedly connected to the cap-type impeller 1. The rotation direction is opposite to that of the cap-type impeller 1. Specifically, the cap-type impeller 1 includes a cylindrical cover 11 and impeller blades 12. The top of the cylindrical cover 11 is a closed structure and its bottom is an open structure. An internal threaded hole is opened at the center of the top of the inner side of the cylindrical cover 11. An external thread is opened on the outer wall of the top of the stirring shaft 2. The top of the stirring shaft 2 is fixedly connected to the cylindrical cover 11 by threaded connection with the internal threaded hole. Multiple impeller blades 12 are evenly and equidistantly fixed on the outer wall of the cylindrical cover 11 along its circumference. There is a gap between the bottom of each impeller blade 12 and the upper surface of the stirring base 6. The upper end of the sleeve 3 passes through the bottom opening of the cylindrical cover 11. The inlet is located inside the cylindrical cover 11, and the inner wall of the cylindrical cover 11 and the upper end of the sleeve 3 form a gas cavity 7. Multiple gas outlet pipes 41 are evenly and equidistantly fixed along the circumference of the outer wall of the cylindrical cover 11. Each gas outlet pipe 41 is connected to the gas cavity 7, and the outer end of each gas outlet pipe 41 is angled upwards towards the inside of the reactor. All gas outlet pipes 41 constitute a first gas distributor 4. A first gap 51 exists between the inner wall of the cylindrical cover 11 and the outer wall of the sleeve 3, and a second gap 52 exists between the bottom opening of the cylindrical cover 11 and the upper surface of the stirring base 6. The first gap 51 and the second gap 52 are connected to the gas cavity 7, and the first gap 51 and the second gap 52 are connected to the gas cavity 7. The air passage formed by the two gaps 52 constitutes the second gas distributor 5; in addition, the bottom opening side of the cylindrical cover 11 is chamfered inward to effectively prevent the compound material of the mixing chassis 6 from flowing back into the air chamber 7 inside the cap-type impeller 1; the upper end of the sleeve 3 located in the air chamber 7 is provided with multiple air inlets 8 along its circumference, and the side wall of the sleeve 3 located below the mixing chassis 6 is provided with an air source interface 9. The air source interface 9 is connected to an external air supply device. The air supply device inputs the mixed gas into the sleeve 3 through the air source interface 9 and into the air chamber 7 through the air inlets 8. Then the gas in the air chamber 7 is blown into the reactor interior and the upper surface of the mixing chassis 6 through the first gas distributor 4 and the second gas distributor 5, respectively.

[0018] In the above design, by forming an air cavity 7 inside the cap-shaped impeller 1, and with the reasonable layout and rotational coordination of the first gas distributor 4 and the second gas distributor 5, a spiral upward airflow can be generated in the reactor, thereby achieving uniform fluidization of the composite material. The first gas distributor 4, as the main air outlet, distributes the airflow evenly as the cap-shaped impeller 1 rotates, breaking the laminar flow limitation caused by traditional static distributors, forming turbulent flow or forced convection, significantly reducing the local concentration difference of the reactant gas, improving the contact efficiency between the reactant gas and the composite material, thereby improving the uniformity of the material coating. Furthermore, the first gas distributor 4 rotates synchronously with the impeller, maintaining a constant relative position, effectively enhancing the controllability of the airflow distribution. The second gas distributor 5, as an auxiliary gas path, is attached to the stirring base 6. The near-purge of materials effectively eliminates the bottom accumulation zone (dead material zone), expands the distribution range of precursors, reduces reaction blind zones, and further improves the completeness of material reaction and compounding efficiency. The cylindrical cover 11 of the cap-type impeller 1 encloses the stirring shaft 2 in the internal air chamber 7. During operation, the air chamber 7 is filled with gas, which can effectively prevent compound materials from entering the stirring shaft 2 area. This avoids jamming, wear, or malfunctions caused by material accumulation in the traditional stirring shaft 2, thereby improving the reliability and stability of continuous equipment operation. During operation, by adjusting the rotation speed of the impeller 12 and the gas flow rate of the gas distributor, different material characteristics and compounding requirements can be flexibly responded to, enhancing the system's adaptability and process window. It is particularly suitable for scenarios with high requirements for fluidization and coating uniformity, such as silicon-carbon anode materials.

[0019] The above embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them. Although the embodiments of this application have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features, without departing from the spirit and scope defined by the claims of this application.

Claims

1. A novel stirring impeller mechanism, mounted on a reactor stirring base (6), comprising a cap-type impeller (1), a stirring shaft (2), a sleeve (3), a first gas distributor (4), and a second gas distributor (5), characterized in that, A through hole is provided in the center of the stirring base (6), and a sleeve (3) is sealed and fixed at the through hole. The sleeve (3) passes through the stirring base (6). A stirring shaft (2) is provided on the sleeve (3) along its axial direction. The stirring shaft (2) passes through the upper and lower ends of the sleeve (3) and is rotatably and sealingly connected to them. The bottom end of the stirring shaft (2) is fixedly connected to an external motor. The top end of the stirring shaft (2) is fixedly connected to a cap-type impeller (1). The rotation direction of the stirring shaft (2) is opposite to the rotation direction of the cap-type impeller (1). The cap-type impeller (1) covers the upper end of the sleeve (3), and there is a gap between its bottom and the upper surface of the stirring base (6). The inside of the cap-type impeller (1) is... A gas cavity (7) is formed between the upper ends of the sleeve (3). A first gas distributor (4) is provided on the outer wall of the cap-type impeller (1). The inner side of the first gas distributor (4) is connected to the gas cavity (7) and its outer side is set towards the inside of the reactor. A second gas distributor (5) is provided at the bottom of the cap-type impeller (1). The inner side of the second gas distributor (5) is connected to the gas cavity (7) and its outer side is set towards the upper surface of the stirring base (6). An air inlet (8) is opened on the side wall of the sleeve (3) located inside the cap-type impeller (1). An air source interface (9) is provided on the side wall of the sleeve (3) located below the stirring base (6). The air source interface (9) is connected to an external air supply device.

2. The novel stirring blade mechanism according to claim 1, characterized in that, The cap-type impeller (1) includes a cylindrical cover (11) and impeller blades (12). The top of the cylindrical cover (11) is a closed structure and its bottom is an opening. An internal thread hole is provided at the center of the top of the cylindrical cover (11). An external thread is provided on the outer wall of the top of the stirring shaft (2). The top of the stirring shaft (2) is fixedly connected to the cylindrical cover (11) by threaded connection with the internal thread hole. Multiple impeller blades (12) are fixedly fixed at equal intervals along the circumference of the outer wall of the cylindrical cover (11). The upper end of the sleeve (3) passes through the bottom opening of the cylindrical cover (11) and is located inside the cylindrical cover (11). The inner wall of the cylindrical cover (11) and the upper end of the sleeve (3) form the air cavity (7).

3. The novel stirring blade mechanism according to claim 2, characterized in that, The first gas distributor (4) includes multiple gas outlet pipes (41). Multiple gas outlet pipes (41) are uniformly and equidistantly fixed on the outer side wall of the cylindrical cover (11) along its circumference. Each gas outlet pipe (41) is connected to the gas chamber (7), and the outer port of each gas outlet pipe (41) is set obliquely upward.

4. The novel stirring blade mechanism according to claim 2, characterized in that, The inner wall of the cylindrical cover (11) and the outer wall of the sleeve (3) have a first gap (51), and the bottom opening of the cylindrical cover (11) and the upper surface of the stirring base (6) have a second gap (52). The first gap (51) and the second gap (52) are connected to the air chamber (7), and the air passage formed by the first gap (51) and the second gap (52) constitutes the second gas distributor (5).

5. A novel stirring blade mechanism according to claim 4, characterized in that, The bottom opening edge of the cylindrical cover (11) is chamfered inward.

6. A novel stirring paddle mechanism according to claim 2, characterized in that, There is a gap between the bottom of each of the blades (12) and the upper surface of the mixing base (6).

7. The novel stirring blade mechanism according to claim 1, characterized in that, The axis of the stirring shaft (2) coincides with the axis of the sleeve (3), and the stirring shaft (2) and the sleeve (3) are connected by a sealed bearing for rotational sealing.

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