A vacuum degassing device

Abstract

This utility model discloses a vacuum degassing device in the field of lithium battery manufacturing technology, aiming to solve the problem that the existing technology usually only uses vacuuming for degassing, which is a long process and affects the efficiency of the device. It includes a tank, on which a vacuum mechanism and a pressurizing mechanism are installed. A stirring mechanism is installed inside the tank. The stirring mechanism includes a power mechanism mounted on the tank, with a rotating shaft inside the tank at the output end of the power mechanism. A paddle is mounted on the rotating shaft, and a scraper is provided on one side of the tank sidewall on the outer wall of the paddle. This utility model achieves slurry tumbling and compression through the coordinated operation of the scraper, paddle, ribbon paddle, and folding paddle, effectively removing air bubbles from the slurry, assisting the vacuum and pressurizing mechanisms in completing the degassing work, improving product quality, and increasing the efficiency of the degassing process.

Description

Technical Field

[0001] This utility model relates to a vacuum degassing device, belonging to the field of lithium battery manufacturing technology. Background Technology

[0002] In the preparation of lithium battery slurry, the problem of excessive air bubbles in the slurry is often encountered. To avoid affecting the final product, the slurry needs to be degassed during cell preparation, making the degassed process an essential part. Vacuuming is a commonly used method for degassing slurry, but if this process relies solely on the buoyancy of the air bubbles, the entire degassed process is very lengthy.

[0003] For example, in the prior art CN208302262U, a vacuum degassing device extracts air from the tank using a vacuum pump while stirring the slurry with stirring blades to assist in degassing. However, the stirring blades of the device have a relatively simple structure, resulting in poor stirring effect on the slurry. It is difficult to achieve tumbling and squeezing of the slurry, which affects the degassing efficiency of the slurry and thus affects the working efficiency of the device. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a vacuum degassing device. Through the coordinated operation of scraper, blade, ribbon blade and folding blade, the slurry is turned over and squeezed, which assists the vacuum mechanism and the pressurization mechanism to complete the degassing work, improves product quality and increases the efficiency of the degassing work.

[0005] To solve the above-mentioned technical problems, this utility model is implemented using the following technical solution:

[0006] This utility model provides a vacuum degassing device, including a tank, on which a stirring mechanism, a vacuum mechanism for extracting air from the tank to form a vacuum environment, and a pressurizing mechanism for adjusting the internal pressure of the tank are provided.

[0007] The stirring mechanism includes a power mechanism mounted on the tank body. The output end of the power mechanism is provided with a rotating shaft inside the tank body. A folding blade is fitted on the outer wall of the rotating shaft. Blades are provided on the rotating shaft. A scraper is provided on one side of the tank body side wall on the outer wall of the blade. A spiral blade is inclinedly provided on the blade.

[0008] The above technical solution uses a vacuum mechanism to evacuate the tank, while a power mechanism drives a rotating shaft to rotate. The rotating shaft drives the paddles, scrapers, folding blades, and ribbon paddles to rotate. The paddles, scrapers, folding blades, and ribbon paddles squeeze and stir the slurry, thereby assisting in the degassing process and significantly improving the efficiency of the degassing work.

[0009] Furthermore, the folding blade includes a sleeve detachably connected to the rotating shaft, and the outer wall of the sleeve is provided with a plurality of blades at an angle.

[0010] In the above technical solution, the sleeve and the rotating shaft are detachably connected. The folding blades can be added or removed according to actual working needs. When the folding blades rotate, the inclined blades can generate axial flow, which pushes the slurry up and down to circulate, enhances convection mixing, reduces stratification or dead zones, thereby ensuring that the bubbles break down quickly and ensuring the working efficiency of the device.

[0011] Furthermore, there are multiple folding blades, with adjacent folding blades arranged alternately.

[0012] The above technical solution, by arranging multiple folding blades in an alternating manner, further avoids dead corners when mixing slurry, and at the same time facilitates the movement of materials, thus ensuring the working efficiency of the device.

[0013] Furthermore, the power mechanism is a stirring motor.

[0014] The above technical solution uses a stirring motor to drive the rotating shaft to rotate. It should be noted that the power mechanism here can be a DC motor, an AC motor, or other types.

[0015] Furthermore, an observation port is provided on the tank body.

[0016] The above technical solution allows observation of the state of the slurry inside the tank through the observation port.

[0017] Furthermore, a searchlight is provided on one side of the observation port on the tank body, ensuring the practicality of this device.

[0018] The above technical solution allows personnel to observe the state of the slurry inside the tank through the observation port using a searchlight.

[0019] Furthermore, the tank body is provided with a slurry inlet, and a slurry inlet control valve is provided inside the slurry inlet.

[0020] The above technical solution involves adding slurry into the tank through a slurry inlet, and the amount of slurry added can be controlled by a slurry inlet control valve.

[0021] Furthermore, the blades and the rotating shaft form a "mountain" shaped structure, and there are multiple scrapers.

[0022] In the above technical solution, the blades and the rotating shaft form a "mountain" shaped structure, so that the blades are located on one side of the tank sidewall, which makes it easy to install the scraper on one side of the tank sidewall, thereby completing the extrusion of the slurry and the tank sidewall, accelerating the bursting of bubbles, and at the same time facilitating the installation of the ribbon paddle.

[0023] Furthermore, the vacuum mechanism includes a vacuum control valve disposed on the tank body, the vacuum control valve being in communication with the interior of the tank body.

[0024] The above technical solution uses a vacuum control valve to perform vacuuming inside the tank.

[0025] Furthermore, the pressurization mechanism includes a pressurization control valve disposed on the tank body, the pressurization control valve being in communication with the interior of the tank body, and a pressure sensor disposed on the tank body for monitoring the internal pressure of the tank body.

[0026] The above technical solution uses a pressure control valve to pressurize the inside of the tank, and a pressure sensor can acquire the internal pressure of the tank in real time, so that the pressure control valve can accurately adjust the internal pressure of the tank.

[0027] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0028] 1. This vacuum degassing device utilizes a scraper that compresses the slurry against the inner wall of the tank during movement, thereby accelerating bubble bursting. The moving blades drive the ribbon paddles, forcing axial material transport and accelerating degassing efficiency. The rotating folding paddles push the material up and down, enhancing convective mixing and facilitating rapid bubble bursting. Through the coordinated operation of the scraper, blades, ribbon paddles, and folding paddles, the slurry is tumbled and compressed, effectively removing bubbles and assisting the vacuum and pressurization mechanisms in degassing, thus improving product quality and efficiency.

[0029] 2. This vacuum degassing device can more effectively remove air bubbles from materials of various viscosities and types, and is particularly suitable for slurry processing where the air bubble content requirement is extremely low; moreover, the stepped vacuum degassing avoids excessive solvent evaporation loss caused by long-term vacuum degassing, as well as the impact on the rheological properties of the slurry. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural schematic diagram of a vacuum degassing device according to an embodiment of the present utility model;

[0031] Figure 2 This is a front view structural schematic diagram of the stirring mechanism provided according to an embodiment of the present utility model;

[0032] Figure 3 This is a schematic diagram of the working process of the control system provided according to an embodiment of the present utility model.

[0033] In the diagram: 1. Tank; 2. Agitator; 21. Agitator motor; 22. Blade; 23. Scraper; 24. Ribbon blade; 25. Folding blade blade; 251. Sleeve; 252. Blade; 26. Shaft; 3. Vacuum mechanism; 31. Vacuum control valve; 4. Pressurization mechanism; 41. Pressurization control valve; 5. Slurry inlet; 6. Observation port; 7. Searchlight; 8. Pressure sensor. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0035] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] like Figures 1-2As shown, this utility model provides a vacuum degassing device, including a tank 1. The tank 1 is provided with a stirring mechanism, a vacuum mechanism 3 for extracting air from the tank 1 to form a vacuum environment, and a pressurizing mechanism 4 for adjusting the internal pressure of the tank 1. The stirring mechanism 2 includes a power mechanism disposed on the tank 1. The output end of the power mechanism is provided with a rotating shaft 26 inside the tank 1. The rotating shaft 26 is provided with a blade 22. The outer wall of the blade 22 is provided with a scraper 23 on one side of the side wall of the tank 1. A folding blade 25 is sleeved on the outer wall of the rotating shaft 26. A spiral blade 24 is inclinedly provided on the blade 22.

[0038] Specifically, tank 1 is used to contain the slurry to be processed; vacuum mechanism 3 is connected to tank 1 and is used to extract air from tank 1 to form a vacuum environment; pressurization mechanism 4 can release gas or air into tank 1 to increase the pressure of tank 1; stirring mechanism 2 is used to stir the slurry in tank 1, causing bubbles to emerge from the liquid surface after their volume increases.

[0039] During operation, when degassing of the slurry inside tank 1 is required, the vacuum mechanism 3 or pressurization mechanism 4 is activated according to actual work needs to evacuate or pressurize tank 1. After adjusting the pressure inside tank 1 to the required level, the power mechanism in the stirring mechanism 2 starts working, driving the rotating shaft 26 to rotate. The rotating shaft 26 drives the blades 22 to rotate, and the scraper 23 moves with the blades 22. When the scraper 23 moves, it can squeeze the slurry against the inner wall of tank 1, thereby accelerating the bursting of bubbles. When the blades 22 move, they can drive the ribbon paddle 24 to move, thereby forcibly conveying the material axially, along with the blades 22. The combined action of the scraper 23, blades 22, ribbon paddle 24, and folding paddle 25 creates a three-dimensional mixing model, enabling rapid bubble rise and allowing bubbles to emerge from the liquid surface as their volume increases, thus accelerating degassing efficiency. When the rotating shaft 26 drives the folding paddle 25 to rotate, it promotes material circulation, enhances convection mixing, reduces stratification and dead zones, and facilitates rapid bubble breakage. In summary, this application, through the coordinated operation of the scraper 23, paddles 22, ribbon paddle 24, and folding paddle 25, achieves slurry tumbling and extrusion, effectively removing bubbles from the slurry, improving degassing efficiency and product quality. This assists the vacuum mechanism 3 and the pressurizing mechanism 4 in completing the degassing work, enhancing the efficiency of the degassing process and ensuring the effectiveness of the device.

[0040] like Figure 2 As shown in one embodiment, the folding blade 25 includes a sleeve 251 detachably connected to the rotating shaft 26, and the outer wall of the sleeve 251 is provided with a plurality of blades 252 at an angle.

[0041] Specifically, when the inclined blades 252 rotate, they can generate axial flow, which pushes the material to circulate up and down, enhances convective mixing, reduces stratification or dead zones, and enables rapid bubble bursting; optionally, the angle of inclination of the blades 252 is greater than 45°, and adjacent blades 252 are staggered.

[0042] In one embodiment, there are multiple folding blades 25, with adjacent folding blades 25 arranged alternately; the materials can be stirred by multiple alternately arranged folding blades 25, further ensuring the stirring effect of the folding blades 25 on the slurry.

[0043] In one embodiment, the power mechanism is a stirring motor 21; optionally, the power mechanism includes, but is not limited to, a DC motor or an AC motor.

[0044] In one embodiment, the tank body 1 is provided with an observation port 6; a searchlight 7 is provided on one side of the observation port 6 on the tank body 1.

[0045] During use, the condition of the slurry inside the tank 1 can be observed through the observation port 6. The searchlight 7 can illuminate the inside of the tank 1 to assist the observation work through the observation port 6.

[0046] In one embodiment, the tank body 1 is provided with a slurry inlet 5, and a slurry inlet control valve is provided inside the slurry inlet 5. Slurry is added to the inside of the tank body 1 through the slurry inlet 5, and the amount of slurry added can be controlled by the slurry inlet control valve.

[0047] In one embodiment, the blade 22 and the rotating shaft 26 form a "mountain" shaped structure, and there are multiple scrapers 23. The blade 22 with the "mountain" shaped structure is close to the inner wall of the tank 1, so that multiple scrapers 23 close to the tank 1 can be set on the outer wall of the blade 22, thereby increasing the working area of ​​the slurry and the inner wall of the tank 1 and further accelerating the bursting of bubbles.

[0048] In one embodiment, the vacuum mechanism 3 includes a vacuum control valve 31 mounted on the tank 1. The vacuum control valve 31 is used to evacuate the inside of the tank 1. The vacuum control valve 31 is connected to a public equipment vacuum pump system via a pipeline. The pressure in the tank 1 can be rapidly reduced by switching the vacuum control valve 31 on and off. The pressurization mechanism 4 includes a pressurization control valve 41 mounted on the tank 1. The tank 1 is equipped with a pressure sensor 8 for monitoring the internal pressure of the tank 1. The pressurization control valve 41 is used to pressurize the inside of the tank 1. At the same time, the pressure sensor 8 can obtain the internal pressure of the tank 1 in real time so that the pressurization control valve 41 can accurately adjust the internal pressure of the tank 1. The pressurization mechanism 4 can be nitrogen stored in a gas cylinder or dry air with a dew point < -40℃, and the gas release is controlled by the pressurization control valve 41.

[0049] like Figure 3 As shown in one embodiment, the device further includes a control system for automatically adjusting the vacuum mechanism 3 and the pressurizing mechanism 4 according to a preset program, and for setting the total duration of the degassing process and the duration of each stage; the control system can preset multiple pressure stages and durations to form a pressure cycle mode of gradually decreasing and then gradually increasing pressure, each cycle including four stages: rapid pressure reduction, maintaining low pressure, slow pressure increase and maintaining high pressure.

[0050] Specifically, the control system is activated, and the stepped pressure regulation is started according to the preset program;

[0051] During the rapid depressurization phase (negative pressure < -90 kPa), start the vacuum pump and open the vacuum control valve 31 to quickly reduce the pressure in tank 1.

[0052] During the low-pressure phase (negative pressure < -90 kPa), maintain the low pressure in tank 1 for a period of time to allow the bubbles in the slurry to expand;

[0053] During the slow pressurization phase (-90kPa to 0kPa), the pressurization mechanism 4 gradually increases the pressure in the tank 1, while the stirring mechanism 2 compresses and breaks up the bubbles.

[0054] Maintain positive pressure (0 kPa-100 kPa) during the high-pressure phase and keep the high pressure for a certain period of time to ensure that the bubbles are completely removed;

[0055] Based on the material properties and degassing requirements, repeat the above-mentioned stepped pressure cycle multiple times.

[0056] After degassing is completed, the pressure in tank 1 is slowly restored to atmospheric pressure, and the treated material is transported to the next process.

[0057] This application can more effectively remove air bubbles from materials of various viscosities and types, and is particularly suitable for slurry processing where the air bubble content requirement is extremely low; moreover, the stepped vacuum degassing avoids excessive solvent evaporation loss caused by long-term vacuum degassing, as well as the impact on the rheological properties of the slurry.

[0058] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A vacuum deaeration device, characterized by, Includes a tank (1), which is provided with a stirring mechanism, a vacuum mechanism (3) for extracting air from the tank (1) to form a vacuum environment, and a pressurizing mechanism (4) for adjusting the internal pressure of the tank (1). The stirring mechanism (2) includes a power mechanism installed on the tank (1). The output end of the power mechanism is provided with a rotating shaft (26) inside the tank (1). A folding blade (25) is fitted on the outer wall of the rotating shaft (26). A blade (22) is provided on the rotating shaft (26). A scraper (23) is provided on one side of the side wall of the tank (1) on the outer wall of the blade (22). A spiral blade (24) is inclined on the blade (22).

2. The vacuum devolatilization apparatus according to claim 1, characterized by The folding blade (25) includes a sleeve (251) detachably connected to the rotating shaft (26), and the outer wall of the sleeve (251) is provided with a plurality of blades (252) at an angle.

3. The vacuum devolatilization apparatus according to claim 1, characterized by The number of the folding blades (25) is multiple, and two adjacent folding blades (25) are staggered.

4. The vacuum devolatilization apparatus according to claim 1, characterized by The power mechanism is a stirring motor (21).

5. The vacuum devolatilization apparatus according to claim 1, characterized by An observation port (6) is provided on the tank (1).

6. The vacuum devolatilization apparatus according to claim 5, wherein A searchlight (7) is provided on one side of the observation port (6) on the tank body (1).

7. The vacuum devolatilization apparatus according to claim 1, characterized by The tank (1) is provided with a slurry inlet (5), and a slurry inlet control valve is provided inside the slurry inlet (5).

8. The vacuum devolatilization apparatus according to claim 1, characterized by The blade (22) and the rotating shaft (26) form a "mountain" shaped structure, and there are multiple scrapers (23).

9. The vacuum devolatilization apparatus according to claim 1, characterized by The vacuum mechanism (3) includes a vacuum control valve (31) disposed on the tank (1), and the vacuum control valve (31) is in communication with the interior of the tank (1).

10. The vacuum devolatilization apparatus according to claim 1, characterized by The pressurizing mechanism (4) includes a pressurizing control valve (41) disposed on the tank (1), the pressurizing control valve (41) being in communication with the interior of the tank (1), and a pressure sensor (8) for monitoring the internal pressure of the tank (1) being disposed on the tank (1).

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