Ceramic gear pump and gear pump coating device

Abstract

The utility model discloses a ceramic gear pump and a gear pump coating device, the ceramic gear pump comprises a pump body, a driving motor, a driving gear and a driven gear, the driving gear and the driven gear are meshed with each other and arranged in the pump body, the driving motor drives the driving gear to rotate, the driving gear and the driven gear are both ceramic gears, and the driving gear and the driven gear are arranged in the pump body. The pump body is provided with an installation cavity used for arranging the driving gear and the driven gear, a liquid outlet flow channel is reserved between at least one of the driving gear and the driven gear and the peripheral wall of the installation cavity, the pump body is provided with a liquid outlet pipe and a liquid inlet pipe, and the liquid outlet pipe and the liquid inlet pipe are both communicated with the liquid outlet flow channel. The lithium battery coating device has the advantages that the internal structure of the gear pump is simple, and when the gear pump for lithium battery coating feeding is damaged, the lithium battery coating device is relatively easy to overhaul and maintain.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery coating, and in particular to a ceramic gear pump and a gear pump coating device. Background Technology

[0002] In the field of lithium battery manufacturing, the coating process is considered a core link affecting battery performance and quality. The coating process involves applying a slurry to the current collector to form electrodes, and it has stringent requirements for the accuracy and stability of the coating effect. The feed pump, as the "heart" of the feed system in the coating process, plays a crucial role. Currently, the traditional feed pumps relied upon for lithium battery coating have revealed many drawbacks.

[0003] The existing pump body has an extremely complex structure, composed of numerous components of different specifications and functions. The connection methods of these components are cumbersome, requiring strict control of tolerances during assembly. Even slight deviations can affect the overall performance of the pump body. This not only demands high levels of professional skills and experience from assembly workers, consuming significant manpower, but also greatly extends the assembly cycle, severely hindering production efficiency. When the pump body malfunctions and requires maintenance, the complex internal structure makes troubleshooting extremely difficult, requiring extensive time for disassembly, testing, and repair. Furthermore, the high difficulty of repair and the potential for secondary damage to surrounding components due to carelessness further complicate matters. On the other hand, the complex structure results in a large overall size of the pump body, requiring considerable space for transportation. This not only increases transportation costs but also raises the risk of damage from collisions and vibrations during transport. Moreover, during installation in the production workshop, the complex structure and large size of the pump body impose stringent space requirements, limiting the flexibility and rationality of equipment layout. Therefore, there is an urgent need for a streamlined pump body to be used in the lithium battery coating process to overcome the many drawbacks of traditional pump bodies and ensure the efficient and stable operation of the lithium battery coating process. Summary of the Invention

[0004] This utility model provides a ceramic gear pump and a gear pump coating device.

[0005] This utility model provides a technical solution that adopts the following approach:

[0006] A ceramic gear pump includes a pump body, a drive motor, a drive gear, and a driven gear. The drive gear and the driven gear are meshed together in the pump body. The drive motor drives the drive gear to rotate. Both the drive gear and the driven gear are ceramic gears. The pump body has an installation cavity for mounting the drive gear and the driven gear. At least one of the drive gear and the driven gear has a liquid outlet channel on the peripheral wall of the installation cavity. The pump body is provided with an outlet pipe and an inlet pipe, both of which are connected to the outlet channel.

[0007] The driving gear and driven gear are made of ceramic gears, which makes them less prone to wear during meshing transmission. At least one gear between the driving gear and driven gear has a liquid outlet channel for slurry to flow out. Alternatively, the driving gear and driven gear can be configured to cooperate to form a liquid outlet channel for slurry to be sucked out, so that the slurry can be smoothly sucked from the inlet pipe to the outlet pipe. The slurry can also serve as a medium for mutual lubrication between the driven gear and the driving gear, making the two gears less prone to wear.

[0008] By using this gear to replace the traditional pump body, the liquid outlet and inlet pipes and the structure between the pump body in the traditional pump body are replaced with an integrally formed chamber set in the pump body of the gear pump. Under the condition of consistent pumped slurry flow, the gear pump is relatively small in size and has a simple internal structure. When the gear pump is damaged, it is relatively easier to inspect and repair.

[0009] Preferably, the pump body is provided with a connecting channel, which is located on both sides of the meshing point of the driving gear and the driven gear. The connecting channel connects the liquid outlet channel to the liquid outlet pipe and the liquid inlet pipe respectively. The diameter of the liquid outlet channel is smaller than the diameter of the liquid outlet pipe and the liquid inlet pipe.

[0010] The outlet flow channel has a small diameter, requiring sufficient space and passage at the inlet to allow the liquid to flow smoothly into the pump chamber. A large-diameter inlet pipe ensures smooth liquid intake and provides ample liquid replenishment to the pump chamber. If the inlet pipe diameter is too small, it will limit the liquid flow rate, affecting the pump's efficiency and stability, and may even cause the pump to cavitate. At the outlet, gears are used to compress the liquid to achieve a certain pressure. A smaller pipe diameter helps maintain and increase the outlet pressure, allowing the liquid to be delivered as required in subsequent pipelines.

[0011] Preferably, the pressure angle of the drive gear is in the range of 14.5° to 30°.

[0012] The pressure angle of the driven gear is set to be adapted to the driving gear. The pressure angle of the driving gear can be selected according to the required feeding speed and flow rate of the lithium battery coating device by the gear pump.

[0013] Preferably, the concentricity tolerance between the driving gear and the driven gear is not less than 3μm.

[0014] A gear pump coating device includes a coating die, a coating roller, and a ceramic gear pump. The coating die has a material inlet and a coating outlet. The material inlet is connected to a liquid outlet. The coating die has a uniform material chamber connecting the material inlet and the coating outlet. The length direction of the coating outlet is consistent with the length direction of the coating roller. The shape of the material inlet is adapted to the shape of the liquid outlet. The coating outlet is positioned directly opposite and close to the surface of the coating roller to allow the coating slurry to adhere to a collector on the outer periphery of the coating roller.

[0015] The gear pump coating unit organically combines a ceramic gear pump with a coating device, achieving synergistic effects from multiple technological advantages. Leveraging the high wear resistance and corrosion resistance of ceramic gears, and with an optimized pressure angle design, the ceramic gear pump significantly improves the flow accuracy and stability of slurry delivery while ensuring its own long service life. The layout of the material inlet, leveling chamber, coating port, and coating roller in the coating device is precisely matched with the ceramic gear pump, ensuring high efficiency and stability throughout the entire process from slurry delivery to coating. The entire unit not only effectively reduces coating quality problems caused by component wear and flow fluctuations but also reduces slurry waste and improves production efficiency. Simultaneously, the simple structure and small size of the ceramic gear pump make maintenance and repair of the entire unit more convenient, effectively reducing overall operating costs and contributing to improved uniformity and accuracy of lithium battery coating slurry.

[0016] Preferably, the coating nozzle is located above the horizontal plane where the coating roller axis is located, and the coating die head has a recessed portion on the side near the coating roller that moves away from the coating roller for avoidance. The projection of the coating nozzle on the horizontal plane is located between the projection of the coating roller axis and the projection of the side of the coating roller closest to the coating die head.

[0017] The coating nozzle is positioned higher than the coating roller and close to the peripheral wall of the coating roller. This design allows the slurry flowing out of the coating nozzle to fully contact the current collector on the coating roller. In addition, some of the slurry that does not completely adhere to the current collector can still fall onto the current collector under the action of gravity. This design can reduce slurry waste and allow the slurry to be more evenly and stably adsorbed onto the current collector.

[0018] In summary, this utility model has the following beneficial technical effects:

[0019] The driving gear and driven gear are made of ceramic gears, which makes them less prone to wear during meshing transmission. At least one gear between the driving gear and driven gear has a liquid outlet channel for slurry to flow out. Alternatively, the driving gear and driven gear can be configured to cooperate to form a liquid outlet channel for slurry to be sucked out, so that the slurry can be smoothly sucked from the inlet pipe to the outlet pipe. The slurry can also serve as a medium for mutual lubrication between the driven gear and the driving gear, making the two gears less prone to wear.

[0020] This gear is used to replace the traditional pump body. The liquid outlet and inlet pipes and the structure between the pump body in the traditional pump body are replaced by an integrally formed chamber set in the pump body of the gear pump. The gear pump is relatively small in size and has a simple internal structure. When the gear pump is damaged, it is relatively easier to inspect and repair. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a ceramic gear pump according to this utility model.

[0022] Figure 2 This is a schematic diagram of the overall structure of a gear pump coating device according to this utility model.

[0023] Figure 3 This is a schematic diagram of the material feeding system of the gear pump coating device of this utility model.

[0024] Explanation of reference numerals in the attached drawings: 1. Pump body; 2. Drive motor; 3. Drive gear; 4. Driven gear; 5. Mounting cavity; 6. Liquid outlet pipe; 7. Liquid inlet pipe; 8. Connecting flow channel; 9. Coating die head; 10. Coating roller; 11. Material inlet; 12. Coating port; 13. Recess; 14. Material leveling chamber. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-3 The present invention will be described in further detail below.

[0026] This utility model discloses a ceramic gear pump and a gear pump coating device.

[0027] Reference Figure 1 as well as Figure 2 A ceramic gear pump includes a pump body 1, a drive motor 2, a drive gear 3, and a driven gear 4. The drive gear 3 and the driven gear 4 are meshed with each other and are disposed within the pump body 1. The drive motor 2 drives the drive gear 3 to rotate. Both the drive gear 3 and the driven gear 4 are ceramic gears. The pump body 1 has an installation cavity 5 for mounting the drive gear 3 and the driven gear 4. At least one of the drive gear 3 and the driven gear 4 has a liquid outlet channel on the periphery of the installation cavity 5. The pump body 1 is provided with an outlet pipe 6 and an inlet pipe 7, both of which are connected to the outlet channel.

[0028] The driving gear 3 and the driven gear 4 are ceramic gears, which makes them less prone to wear during meshing. At least one gear between the driving gear 3 and the driven gear 4 has a liquid outlet channel for slurry to flow out. Alternatively, the driving gear 3 and the driven gear 4 can be configured to cooperate to form a liquid outlet channel for slurry to be sucked out, so that the slurry can be smoothly sucked from the inlet pipe 7 to the outlet pipe. The slurry can also serve as a lubricating medium between the driven gear 4 and the driving gear 3, making the two gears less prone to wear.

[0029] The gear is used to replace the traditional pump body 1. The liquid outlet and inlet pipes and the structure between the pump body 1 in the traditional pump body 1 are replaced with an integrally formed chamber set in the pump body 1 of the gear pump. The gear pump is relatively small in size and has a simple internal structure. When the gear pump is damaged, it is relatively easier to inspect and repair.

[0030] like Figure 3As shown, a storage tank is also connected to the end of the inlet pipe away from the pump body. The slurry in the storage tank is selected as the positive or negative electrode coating slurry according to the requirements of lithium battery coating. It is mainly composed of positive or negative electrode active materials, conductive agents, binders and solvents. The method of feeding the slurry and storage tank towards the inlet pipe is the existing technology and will not be described in detail here.

[0031] Reference Figure 1 as well as Figure 2 In this embodiment, a connecting channel 8 is provided inside the pump body 1. The connecting channel 8 is located on both sides of the meshing point of the driving gear 3 and the driven gear 4. The connecting channel 8 connects the liquid outlet channel to the liquid outlet pipe 6 and the liquid inlet pipe 7 respectively. The diameter of the liquid outlet channel is smaller than the diameter of the liquid outlet pipe 6 and the liquid inlet pipe 7.

[0032] The outlet channel has a small diameter, requiring sufficient space and passage at the inlet to allow the lithium battery coating slurry to flow smoothly into the pump chamber. A large-diameter inlet pipe ensures smooth liquid intake and provides ample liquid replenishment to the pump chamber. If the inlet pipe diameter is too small, it will limit the liquid flow, affecting the pump's efficiency and stability, and may even cause the pump to cavitate. At the outlet, gears are used to compress the liquid to achieve a certain pressure. A smaller pipe diameter helps maintain and increase the outlet pressure, allowing the liquid to be delivered as required in subsequent pipelines.

[0033] Reference Figure 1 as well as Figure 2 In this embodiment, the pressure angle of the drive gear 3 ranges from 14.5° to 30°.

[0034] The pressure angle of the driven gear 4 is set to be adapted to the driving gear 3. The driving gear 3 can select the pressure angle according to the required feeding speed and flow rate of the lithium battery coating device by the gear pump.

[0035] In this embodiment, to maximize the delivery accuracy of the gear pump, the pressure angle of the drive gear 3 is selected as 20°, 25° or 30°.

[0036] The concentricity tolerance between the driving gear and the driven gear is not less than 3μm. In this embodiment, the concentricity is set to 3μm, which can greatly improve the accuracy of the gears. The high-precision ceramic gears with a concentricity of 3μm can ensure that the gaps between gears and between gears and pump housing are uniform during rotation. In this way, the volume of liquid transported each time the gear rotates is almost the same, thereby achieving precise flow control.

[0037] This embodiment also discloses a gear pump coating device, including a coating die head 9, a coating roller 10, and a ceramic gear pump. The coating die head 9 is provided with a receiving port 11 and a coating port 12, and the receiving port 11 is connected to the liquid outlet. The coating die head 9 is provided with a uniform material chamber 14 that connects the receiving port 11 and the coating port 12. The coating roller 10 is rotatably positioned near the coating port 12. The length direction of the coating port 12 is consistent with the length direction of the coating roller 10. The shape of the receiving port 11 is adapted to the shape of the liquid outlet pipe 6 so as to connect the liquid outlet pipe 6. The coating port 12 is positioned directly opposite a portion of the surface of the coating roller 10 and close to the surface of the coating roller 10 so that the lithium battery coating slurry can adhere to the current collector on the outer periphery of the coating roller 10. The coating port 12 has a rectangular opening, and the width of the coating port 12 is set to be smaller to adapt to the width of the uniform material chamber 14 so that the lithium battery coating slurry can flow out uniformly from the uniform material chamber 14.

[0038] The gear pump coating unit organically combines a ceramic gear pump with a coating device, achieving synergistic effects from multiple technological advantages. Leveraging the high wear resistance and corrosion resistance of ceramic gears, and with an optimized pressure angle design, the ceramic gear pump significantly improves the flow accuracy and stability of slurry delivery while ensuring its own long service life. The layout of the material inlet 11, the uniform chamber 14, the coating port 12, and the coating roller 10 in the coating device is precisely matched with the ceramic gear pump, ensuring high efficiency and stability throughout the entire process from slurry delivery to coating. The entire unit not only effectively reduces coating quality problems caused by component wear and flow fluctuations but also reduces slurry waste and improves production efficiency. Simultaneously, the simple structure and small size of the ceramic gear pump make maintenance and repair of the entire unit more convenient, effectively reducing overall operating costs and contributing to improved uniformity and accuracy of lithium battery coating slurry.

[0039] In practical use, a filter, a magnetic separator, and a flow meter are also installed between the pump body and the coating die of the coating device. The slurry exits from the storage tank, passes through a gear pump, and then the gear pump delivers the slurry to the pipe connected to the coating die. Between the gear pump and the coating die, the slurry sequentially passes through a filter to remove impurities, then through a magnetic separator to remove iron, and finally through a flow meter to measure the slurry flow rate before being delivered to the full coating die. The filter, magnetic separator, and flow meter are all existing technologies and will not be described in detail here.

[0040] Reference Figure 1 as well as Figure 2 In this embodiment, the coating nozzle 12 is located above the horizontal plane where the axis of the coating roller 10 is located. The coating die 9 has a recessed portion 13 for avoidance on the side close to the coating roller 10 and in the direction away from the coating roller 10. The projection of the coating nozzle 12 on the horizontal plane is located between the projection of the axis of the coating roller 10 and the projection of the side of the coating roller 10 closest to the coating die 9.

[0041] The coating nozzle 12 is positioned higher than the coating roller 10 and close to the peripheral wall of the coating roller 10. This allows the slurry flowing from the coating nozzle 12 to not only fully contact the current collector on the coating roller 10, but also allows some of the slurry that is not completely adhered to the current collector to fall onto the current collector under the action of gravity. This design can reduce slurry waste and allow the slurry to be more evenly and stably adsorbed onto the current collector.

[0042] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A ceramic gear pump characterized by: The pump body, the driving motor, the driving gear and the driven gear, the driving gear and the driven gear are arranged in the pump body, the driving motor drives the driving gear to rotate, the driving gear and the driven gear are ceramic gears, the pump body is provided with an installation cavity for arranging the driving gear and the driven gear, at least one of the driving gear and the driven gear is provided with a liquid outlet channel relative to the installation cavity, the pump body is provided with a liquid outlet pipe and a liquid inlet pipe, and the liquid outlet pipe and the liquid inlet pipe are communicated with the liquid outlet channel.

2. The ceramic gear pump of claim 1, wherein: The pump body is provided with a communication channel, the communication channel is opposite to the two sides of the driving gear and the driven gear, the communication channel is communicated with the liquid outlet channel and the liquid inlet channel, and the diameter of the liquid outlet channel is smaller than that of the liquid outlet pipe and the liquid inlet pipe.

3. The ceramic gear pump of claim 2, wherein: The pressure angle of the driving gear is 14.5° to 30°.

4. The ceramic gear pump of claim 2, wherein: The concentricity tolerance of the driving gear and the driven gear is not less than 3μm.

5. A gear pump coating device characterized by: The coating die, the coating roller and the ceramic gear pump of any one of claims 1-4, the coating die is provided with a receiving port and a coating port, the receiving port is communicated with the liquid outlet, the coating die is provided with a uniform material cavity for communicating the receiving port and the coating port, the length direction of the coating port is consistent with the length direction of the coating roller, the shape of the receiving port is matched with the shape of the liquid outlet pipe, the coating port is opposite to part of the surface of the coating roller and is close to the surface of the coating roller for the lithium battery coating slurry to adhere to the current collector on the outer periphery of the coating roller.

6. The gear pump coating apparatus of claim 5, wherein: The coating port is above the horizontal plane where the axis of the coating roller is located, the side of the coating die close to the coating roller is recessed in the direction away from the coating roller for avoiding, the projection of the coating port on the horizontal plane is between the projection of the axis of the coating roller and the projection of the side of the coating roller closest to the coating die.

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