Screw pump and screw feeding system for battery coating

Abstract

The utility model discloses a screw pump for battery coating, which comprises a pump body, a feed pipe is arranged at one end of the pump body, a discharge pipe is arranged at the other end of the pump body, a pump core is arranged in the pump body, two ends of the pump core are respectively communicated with the feed pipe and the discharge pipe, and the feed pipe is communicated with the discharge pipe. The pump core comprises a stator and a rotor rotationally connected into the stator. A circulating pipeline is arranged between the discharging pipe and the feeding pipe, the circulating pipeline is communicated with the feeding pipe and the discharging pipe of the screw pump, a loop is formed between the discharging pipe and the feeding pipe, and when the screw pump stops supplying materials to the trolley, the ball valve is automatically opened, so that slurry in the screw pump is always kept in a flowing state; and the slurry is prevented from standing and depositing inside after the screw pump stops feeding, so that the risk of coating blockage can be reduced, the product quality is improved, the degree of wear of a dry material to the screw is reduced, and the maintenance cost of the screw is greatly reduced.

Description

Technical Field

[0001] This utility model relates to a screw pump and screw feeding system for battery coating. Background Technology

[0002] As a representative of modern energy storage technology, lithium batteries' performance and application scope directly affect the development of multiple fields such as electric vehicles, wearable devices, and energy storage power stations. Coating is the next process after slurry preparation. This process mainly involves uniformly coating a stable and fluid slurry onto the positive and negative current collectors. Good consistency in coating density and interface are of great significance to the performance and safety of lithium batteries, and a stable coating feeding system (screw pump) plays an important role in manufacturing electrodes with stable coating density and good interface.

[0003] Currently, screw pump feeding systems typically consist of a double-ended helical cavity bushing (stator) and a single-ended eccentric screw (rotor) meshing with it within the stator cavity. When the input shaft drives the rotor to planetary rotate around the stator center via a universal joint, the special geometry of the rotor and stator creates several individual sealed cavities. The rotor's operation continuously and uniformly delivers the medium within each sealed cavity from the suction end to the discharge end, maintaining a constant volume.

[0004] During the internal and external circulation of the coating die head, the feeding trolley and the die head cavity system reach a stable state, and the screw pump stops feeding the feeding trolley. At this time, the slurry in the screw and pipeline is in a static state. Slurry with relatively poor stability is prone to sedimentation and agglomeration in the static state. After production resumes, some of the static slurry in the system will remain in the screw coupling cavity. Slurry entering the trolley will cause unstable coating surface density or intermittent foil leakage, scratches and other appearance defects. Slurry that settles in the screw cannot be discharged for a long time and is prone to drying and aggravating coating appearance defects. In severe cases, it can directly damage the screw pump. Utility Model Content

[0005] The purpose of this invention is to provide a screw pump and screw feeding system for battery coating, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A screw pump for battery coating includes a pump body, an inlet pipe at one end of the pump body, an outlet pipe at the other end of the pump body, a pump core inside the pump body, and the two ends of the pump core are respectively connected to the inlet pipe and the outlet pipe. The pump core includes a stator and a rotor rotatably connected to the stator.

[0008] A circulation pipe is provided between the discharge pipe and the feed pipe.

[0009] By setting up a circulation pipe, the material in the feed pipe can be returned to the feed pipe through the circulation pipe, thereby allowing the screw pump to work continuously without outputting material, thus avoiding material accumulation caused by prolonged shutdown of the screw pump.

[0010] As a further embodiment of this utility model: a bushing is provided between the outer wall of the stator and the inner wall of the pump body, and the stator is fixedly connected to the pump body through the bushing.

[0011] A bushing is installed between the stator and the inner wall of the pump body. The bushing can better fix the stator in the pump body and reduce the transmission of stator and shaft vibration to the pump body.

[0012] As a further embodiment of this utility model: a drive unit is provided at one end of the pump body away from the discharge pipe, and the drive unit is connected to the rotor through a transmission assembly to drive the rotor to rotate in the stator.

[0013] The rotor is driven to rotate by outputting power from the drive unit.

[0014] As a further embodiment of this utility model: the drive unit includes a motor, the transmission assembly includes a connecting shaft that is poweredly connected to the output shaft of the motor, the connecting shaft is poweredly connected to the output shaft of the motor through a coupling, and the connecting shaft is poweredly connected to the rotor through a universal joint.

[0015] The drive unit uses an electric motor, which allows for better control of the rotor speed, thereby controlling the pump flow rate.

[0016] As a further embodiment of this utility model: a screw pump base is provided below the pump body, the motor is fixedly connected to the screw pump base, and the connecting shaft is rotatably connected to the screw pump base through a bearing.

[0017] The screw pump base provides effective support for the pump body, motor, and connecting shaft.

[0018] As a further embodiment of this utility model, a pressure sensor is provided on the inner wall of the discharge pipe.

[0019] By setting up a pressure sensor to detect the pressure inside the discharge pipe in real time, the circulation pipe can be opened or closed according to the pressure inside the discharge pipe.

[0020] As a further embodiment of this utility model: a ball valve and a pneumatic ball valve switch for controlling the ball valve are provided on the circulation pipeline.

[0021] The opening or closing of the ball valve can be remotely controlled via a pneumatic ball valve switch.

[0022] A battery coating screw feeding system is characterized in that it includes a screw pump and a coating mechanism connected to the discharge pipe of the screw pump, the feed pipe of the screw pump is connected to a feeding mechanism, and the coating mechanism includes a buffer carriage and a coating nozzle connected to the buffer carriage.

[0023] The screw pump with a circulation pipe supplies material to the buffer carriage of the coating mechanism. When the buffer carriage is full of material, the circulation pipe on the screw pump is opened, so that the material pumped out by the screw pump is circulated through the circulation pipe. This can stop the material supply to the buffer carriage and also prevent the screw pump from being shut down for a long time.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model sets up a circulation pipe, which is connected to the feed pipe and discharge pipe of the screw pump, forming a loop between the discharge pipe and the feed pipe. When the screw pump stops feeding material to the trolley, the ball valve automatically opens, keeping the slurry in the screw pump in a constant state of flow. This avoids the slurry settling and settling inside the screw pump after the screw pump stops feeding material, which can reduce the risk of coating blockage and improve product quality. At the same time, it also reduces the wear of dry material on the screw and greatly reduces the screw maintenance cost. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the screw pump in this embodiment;

[0026] In the diagram: 1-Discharge pipe, 2-Bushing, 3-Stator, 4-Rotor, 5-Universal joint, 6-Connecting shaft, 7-Infeed pipe, 8-Bearing, 9-Coupling, 10-Motor, 11-Screw pump base, 12-Pressure sensor, 13-Ball valve, 14-Pneumatic ball valve switch, 15-Circulation pipeline. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1In this embodiment of the present invention, a screw pump for battery coating includes a pump body, a pump core disposed within the pump body, the pump core including a stator 3 and a rotor 4 rotatably connected within the stator 3, a bushing 2 disposed between the outer wall of the stator 3 and the inner wall of the pump body, the stator 3 being fixedly connected to the pump body via the bushing 2, the bushing 2 between the stator 3 and the inner wall of the pump body allows the stator 3 to be better fixed within the pump body, and also reduces the transmission of vibration of the stator and rotor shaft to the pump body, a drive unit disposed at the end of the pump body away from the discharge pipe 1, the drive unit being connected to the rotor 4 via a transmission assembly for driving the rotor 4 to rotate within the stator 3, the drive unit including a motor 10, the transmission assembly including a connecting shaft 6 poweredly connected to the output shaft of the motor 10, the connecting shaft 6 being poweredly connected to the output shaft of the motor 10 via a coupling 9, and the connecting shaft 6 being poweredly connected to the rotor 4 via a universal joint 5.

[0029] One end of the pump body is provided with a feed pipe 7, and the other end of the pump body is provided with a discharge pipe 1. The two ends of the pump core are connected to the feed pipe 7 and the discharge pipe 1, respectively. A circulation pipe 15 is provided between the discharge pipe 1 and the feed pipe 7. By setting up the circulation pipe 15, the material in the discharge pipe 1 can be returned to the feed pipe 7 through the circulation pipe 15, thereby allowing the screw pump to work continuously without outputting material, avoiding material accumulation caused by the screw pump being stopped for a long time. In this embodiment, a pressure sensor 12 is provided on the inner wall of the discharge pipe 1, and a ball valve 13 and a pneumatic ball valve switch 14 for controlling the ball valve 13 are provided on the circulation pipe 15. The ball valve 13 can be remotely controlled to open or close through the pneumatic ball valve switch 14. The pressure sensor 12 is set to detect the pressure in the discharge pipe 1 in real time, and the circulation pipe 15 can be opened or closed according to the pressure in the discharge pipe 1.

[0030] A screw pump base 11 is provided below the pump body. The motor 10 is fixedly connected to the screw pump base 11. The connecting shaft 6 is rotatably connected to the screw pump base 11 through the bearing 8.

[0031] A battery coating screw feeding system is characterized in that it includes a screw pump and a coating mechanism connected to the discharge pipe 1 of the screw pump, the feed pipe 7 of the screw pump is connected to the feeding mechanism, and the coating mechanism includes a buffer carriage and a coating nozzle connected to the buffer carriage.

[0032] The screw pump with circulation pipe 15 supplies material to the buffer carriage of the coating mechanism. When the buffer carriage is full of material, the circulation pipe on the screw pump is opened, so that the material pumped out by the screw pump is circulated through the circulation pipe. This can stop the feeding of the buffer carriage and also prevent the screw pump from being shut down for a long time.

[0033] In use, the motor 10 starts, driving the connecting shaft 6 to rotate, which in turn drives the rotor 4 to rotate. The rotor 4 rotates within the stator 3. Due to the special geometry of the rotor 4 and the stator 3, several separate sealed cavities are formed. The rotation of the rotor 4 continuously and uniformly transports the medium in each sealed cavity from the suction end to the discharge end with a constant volume. That is, the coating material is pumped from the feed pipe 7 into the discharge pipe 1, and then enters the coating buffer carriage through the discharge pipe 1. The coating is then applied to the dark areas via the buffer carriage and the coating head. When the buffer carriage is full, no further coating is needed. Slurry is pumped into the buffer carriage, so the connection between the discharge pipe 1 and the buffer carriage needs to be closed. If the screw pump continues to work at this time, the pressure at the discharge pipe 1 will increase. When the pressure sensor 12 detects the increase in pressure in the discharge pipe 1, the ball valve 13 is opened by the pneumatic ball valve switch, which in turn opens the circulation pipe 15. The slurry in the discharge pipe 1 returns to the feed pipe 7 through the circulation pipe 15, thus ensuring that there is a continuous flow of slurry in the screw pump, avoiding slurry settling, reducing the risk of coating blockage and improving product quality. At the same time, it also reduces the wear of dry material on the screw and greatly reduces the screw maintenance cost.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A screw pump for battery coating, comprising a pump body, characterized in that, One end of the pump body is provided with a feed pipe (7), and the other end of the pump body is provided with a discharge pipe (1). The pump body is provided with a pump core, and the two ends of the pump core are respectively connected to the feed pipe (7) and the discharge pipe (1). The pump core includes a stator (3) and a rotor (4) rotatably connected in the stator (3). A circulation pipe (15) is provided between the discharge pipe (1) and the feed pipe (7); A pressure sensor (12) is installed on the inner wall of the discharge pipe (1), and a ball valve (13) and a pneumatic ball valve switch (14) for controlling the ball valve (13) are installed on the circulation pipe (15).

2. The screw pump for battery coating according to claim 1, characterized in that, A bushing (2) is provided between the outer wall of the stator (3) and the inner wall of the pump body, and the stator (3) is fixedly connected to the pump body through the bushing (2).

3. A screw pump for battery coating according to claim 1, characterized in that, The pump body is provided with a drive unit at one end away from the discharge pipe (1). The drive unit is connected to the rotor (4) through a transmission assembly to drive the rotor (4) to rotate in the stator (3).

4. A screw pump for battery coating according to claim 3, characterized in that, The drive unit includes a motor (10), and the transmission assembly includes a connecting shaft (6) that is poweredly connected to the output shaft of the motor (10). The connecting shaft (6) is poweredly connected to the output shaft of the motor (10) via a coupling (9), and the connecting shaft (6) is poweredly connected to the rotor (4) via a universal joint (5).

5. A screw pump for battery coating according to claim 4, characterized in that, A screw pump base (11) is provided below the pump body. The motor (10) is fixedly connected to the screw pump base (11). The connecting shaft (6) is rotatably connected to the screw pump base (11) through a bearing (8).

6. A battery coating screw feeding system, characterized in that, The invention includes a screw pump for battery coating as described in any one of claims 1-5, wherein the discharge pipe (1) of the screw pump is connected to a coating mechanism, the feed pipe (7) of the screw pump is connected to a feeding mechanism, and the coating mechanism includes a buffer carriage and a coating nozzle connected to the buffer carriage.

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