Self-cleaning slurry filter

Abstract

The utility model relates to the field of slurry pipeline transportation and filtering, disclose a self -cleaning slurry filter. The filter includes casing and sets up filter screen in the casing, the filter screen will casing inner chamber divide into opposite two side areas, casing corresponds filter screen both sides respectively set up feed valve and discharge valve, casing bottom sets up the residue valve, and the washing water inlet valve is set up in the casing top, the emptying blow -off valve group is set up to one side of the casing near feed valve, and the residue blow -off valve group is set up to one side of the casing near discharge valve, and the pressure gauge is set up to one side of the casing top near feed valve. The emptying blow -off valve group and residue blow -off valve group are along the casing surface multiple point planar distribution, cooperate washing water inlet valve and residue valve to realize the in -situ cleaning of filter screen and the discharge of the sediment in the casing. The utility model has the advantages of simple structure, easy maintenance, reduces the risk of introducing metal particles by internal rotating mechanism, and is suitable for the filtration of high cleanliness scenes such as lithium battery slurry.

Description

Technical Field

[0001] This utility model relates to the field of slurry pipeline transportation and filtration technology, specifically to a self-cleaning slurry filter for online filtration and in-situ cleaning of slurry. Background Technology

[0002] Before coating the electrodes in lithium-ion batteries, the positive and negative electrode slurries need to be finely filtered to remove large particles and impurities. Existing static filters require shutdown and screen cleaning, which is labor-intensive and difficult to guarantee timely cleaning. Self-cleaning filters often use internal rotating scrapers and other mechanisms, which pose a risk of wear on moving parts and the potential introduction of metal particles. Utility Model Content

[0003] To address the issues of cumbersome disassembly and cleaning and the risk of particle introduction in existing technologies, a slurry filter with a simple structure that can achieve in-situ cleaning of the filter screen without the need for an internal rotating mechanism is proposed.

[0004] To achieve the above objectives, this utility model provides a self-cleaning slurry filter, comprising a housing, a filter screen, a feed valve and a discharge valve, a slag discharge valve, a cleaning water inlet valve, a purge valve assembly, a slag discharge purge valve assembly, and a pressure gauge. The housing has an inner cavity; the filter screen is disposed within the housing, dividing the inner cavity into opposing two-sided areas; the feed valve and the discharge valve are respectively disposed on opposite sides of the filter screen and communicate with the inner cavity of the housing; the slag discharge valve is disposed at the bottom of the housing; the cleaning water inlet valve is disposed at the top of the housing; the purge valve assembly is disposed on the side of the housing closest to the feed valve; the slag discharge purge valve assembly is disposed on the side of the housing closest to the discharge valve; and the pressure gauge is disposed at the top of the housing, close to the feed valve.

[0005] In some possible implementations, the filter screen has a planar or curved structure.

[0006] In some possible implementations, the feed valve is located in the upper region of the housing and on one side of the filter screen, and the discharge valve is located in the bottom region of the housing and on the other side of the filter screen.

[0007] In some possible implementations, the purge valve assembly includes a plurality of purge valves distributed in a planar pattern along the surface of the housing.

[0008] In some possible implementations, the slag discharge purge valve assembly includes a plurality of slag discharge purge valves distributed in a planar pattern along the surface of the housing.

[0009] In some possible implementations, the cleaning water inlet valve is located at the top of the housing and on the side of the discharge valve, and the slag discharge valve is located at the bottom of the housing and on the side of the inlet valve.

[0010] In some possible implementations, the nominal diameter of the cleaning water inlet valve is larger than the nominal diameter of the slag discharge valve.

[0011] In some possible implementations, the rated operating pressure of the purging valve assembly and the slag discharge purging valve assembly is not less than 0.1 MPa.

[0012] In some possible implementations, the plurality of purge valves and / or the plurality of slag discharge valves are evenly distributed in an array on the outer surface of the corresponding side of the housing.

[0013] The self-cleaning slurry filter provided by this utility model establishes a stable filter flow and in-situ cleaning channel by dividing the inner cavity of the shell with a filter screen and setting the inlet / outlet valves in opposite directions. The cleaning water is introduced from the top of the inlet valve and discharged from the bottom of the slag discharge valve, forming a top-down flushing and directional discharge path. The emptying and slag discharge valve groups are arranged in a spatial arrangement on the inlet and outlet sides, so that the emptying and slag discharge form a counter-coordinated airflow. The pressure gauge near the inlet side indicates the pressure change in the shell in real time to determine the cleaning time. Thus, the filter screen can be cleaned in situ and the deposits can be discharged quickly without relying on the internal rotating mechanism of the shell. This reduces downtime and manual burden caused by disassembly and cleaning, and reduces the risk of metal particles entering the slurry. The structure is simple, maintenance is convenient, and it is suitable for the stable operation of continuous and automated production lines. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of the self-cleaning slurry filter provided by this utility model; Figure 2 A flowchart illustrating the usage method of the self-cleaning slurry filter provided by this utility model.

[0016] Explanation of icon numbers: 100 – Self-cleaning slurry filter; 10 – Housing; 20 – Filter screen; 30 – Feed valve; 40 – Discharge valve; 50 – Slag discharge valve; 60 – Cleaning water inlet valve; 70 – Emptying and purging valve assembly; 71 – Emptying and purging valve; 80 – Slag discharge and purging valve assembly; 81 – Slag discharge and purging valve; 90 – Pressure gauge.

[0017] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0018] 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.

[0019] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0020] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0021] Please see Figure 1 One embodiment of this application provides a self-cleaning slurry filter 100 (hereinafter referred to as slurry filter 100) for online filtration and in-situ cleaning of slurry. Specifically, the slurry is a lithium-ion battery positive or negative electrode slurry. The positive electrode slurry may contain a non-Newtonian fluid mixture composed of active materials such as lithium cobalt oxide and ternary materials, conductive agents, binders, and solvents. The negative electrode slurry may contain a viscous suspension formed by active materials such as graphite and silicon carbide, thickeners, binders, and solvents.

[0022] In this embodiment, the slurry filter 100 includes a housing 10, a filter screen 20, a feed valve 30 and a discharge valve 40, a slag discharge valve 50, a cleaning water inlet valve 60, a purge valve assembly 70, and a pressure gauge 90.

[0023] The housing 10 has an internal cavity. A filter screen 20 is disposed inside the housing 10, dividing the internal cavity into two opposing regions. A feed valve 30 and a discharge valve 40 are respectively disposed on both sides of the filter screen 20 and communicate with the internal cavity of the housing 10. A slag discharge valve 50 is disposed at the bottom of the housing 10. A cleaning water inlet valve 60 is disposed at the top of the housing 10. A purging valve assembly 70 is disposed on the side of the housing 10 closest to the feed valve 30. A slag discharge purging valve assembly 80 is disposed on the side of the housing 10 closest to the discharge valve 40. A pressure gauge 90 is disposed at the top of the housing 10, near the feed valve 30.

[0024] In use, first, open the feed valve 30 and the discharge valve 40 to form a stable filter flow of slurry in the housing 10; then, judge the filter surface load based on the change in the pressure gauge 90 reading and trigger the cleaning process; since the purging and slag removal purges act on the side near the feed and the side near the discharge respectively, they form a counter-cooperative pushing and gathering effect, thereby accelerating the removal of residual materials and deposited particles, shortening the residence time and improving the recovery efficiency of the filter screen 20.

[0025] In some embodiments, the filter screen 20 has a planar or curved structure to adapt to different housing 10 contours and installation spaces. Planar structures facilitate fabrication and replacement, while curved structures help guide slurry flow along the wall and reduce localized sludge accumulation, thus balancing installation convenience and anti-clogging performance under various operating conditions. Specifically, the filter screen 20 is made of one of the following materials: sintered stainless steel mesh, woven metal mesh, wedge-shaped slotted mesh, sintered metal fiber felt, or polytetrafluoroethylene-coated metal mesh. Preferably, the filter screen 20 is made of sintered stainless steel mesh or wedge-shaped slotted mesh to balance structural strength, solvent resistance, and stability during repeated cleaning.

[0026] In some embodiments, a feed valve 30 and a discharge valve 40 are respectively provided on both sides of the housing 10 corresponding to the filter screen 20. Preferably, the feed valve 30 is located in the upper region of the housing 10 and on one side of the filter screen 20, and the discharge valve 40 is located in the bottom region of the housing 10 and on the other side of the filter screen 20. This top-in, bottom-out arrangement is beneficial for utilizing gravity and pressure difference to promote the orderly discharge of slurry after passing through the filter screen 20, reducing retention and air entrainment, thereby improving filtration stability. The feed valve 30 and the discharge valve 40 are one of a ball valve, butterfly valve, gate valve, diaphragm valve, or shut-off valve. Preferably, the feed valve 30 and the discharge valve 40 are full-bore ball valves or lined diaphragm valves to reduce pressure drop, reduce material retention, and facilitate online switching.

[0027] In some embodiments, a slag discharge valve 50 is provided at the bottom of the housing 10. A dedicated slag discharge channel is opened at the bottom, allowing particles accumulated at the lower level of the housing 10 and impurities after cleaning to be discharged smoothly, reducing secondary suspension and backflow to the filter surface, thereby shortening the slag cleaning path and improving cleaning efficiency. The slag discharge valve 50 is one of a knife gate valve, a slag discharge ball valve, or a bottom discharge valve, to accommodate the smooth discharge of high solids content and large particles.

[0028] In some embodiments, a cleaning water inlet valve 60 is provided at the top of the housing 10, and the cleaning water inlet valve 60 is located on the side of the discharge valve 40. Introducing cleaning medium at the top facilitates coverage of the filter surface and inner wall along the direction of gravity. When the nominal diameter of the cleaning water inlet valve 60 is larger than the nominal diameter of the slag discharge valve 50, the top replenishment capacity is stronger, which is beneficial for forming a flushing water curtain that penetrates the housing 10, thereby improving the flushing effect on the filter surface and dead-angle areas. The cleaning water inlet valve 60 is one of a ball valve, a gate valve, or a diaphragm valve, facilitating rapid opening and closing and stable liquid supply.

[0029] In some embodiments, a purge valve assembly 70 is provided on the side of the housing 10 near the feed valve 30. The valve assembly includes multiple purge valves 71 distributed in a planar pattern along the surface of the housing 10. This multi-point array arrangement facilitates the introduction of compressed air from different directions to push the residual slurry inside the housing 10 towards the discharge side or a lower position, achieving rapid purge and thus reducing the mixing ratio of cleaning water and residual slurry. The purge valves can be selected from solenoid valves, angle seat valves, or needle valves to obtain a shorter response time and better durability.

[0030] In some embodiments, a slag discharge purge valve assembly 80 is provided on the side of the housing 10 near the discharge valve 40. The valve assembly includes multiple slag discharge purge valves 81 distributed in a planar pattern along the surface of the housing 10. This valve assembly is used to push and collect the cleaned particles and cleaning water, and works in conjunction with the bottom slag discharge valve 50 to achieve directional discharge of low-level impurities. The rated operating pressure of the valve assembly is not less than 0.1 MPa, which helps to ensure the purging driving force and coverage area. The slag discharge purge valve is one of a solenoid valve, an angle seat valve, or a needle valve to meet the control requirements of directional purging and intermittent pulses.

[0031] In some embodiments, a pressure gauge 90 is installed on the top of the housing 10, near the feed valve 30. The pressure gauge 90 indicates pressure changes within the housing 10; an increase in differential pressure reflects a clogging trend in the filter surface, thus providing a trigger for purging and cleaning. By arranging the pressure indicator near the feed side, it is beneficial to promptly detect the filter surface status on the feed side and shorten the response time. The pressure gauge 90 can be a mechanical pressure gauge 90, a digital pressure gauge 90, or a pressure transmitter with a display, facilitating on-site reading and signal acquisition.

[0032] In some embodiments, the self-cleaning slurry filter 100 further includes a control unit (not shown), which is connected to a cleaning water inlet valve 60, a purge valve assembly 70, a slag discharge purge valve assembly 80, a slag discharge valve 50, and a pressure gauge 90 (or a pressure signal). For example, the control unit receives the signal from the pressure gauge 90 and outputs opening and closing commands sequentially according to preset logic to interlock the purge, rinsing, and slag discharge processes, thereby reducing manual judgment and misoperation. The control unit includes one of a programmable logic controller, an embedded controller, or a relay logic unit, facilitating signal interaction and status monitoring with the host computer on the production line.

[0033] Compared with the prior art, the slurry filter 100 provided in this application has the following advantages: (i) By setting up a purge valve group 70 and a slag discharge purge valve group 80 on both sides of the housing 10 respectively, a counter-coordinated purging and collection path is formed, thereby realizing the directional peeling and rapid discharge of filter surface deposits, shortening the cleaning time and reducing the amount of cleaning.

[0034] (ii) By installing a cleaning water inlet valve 60 at the top and making its nominal diameter larger than that of the bottom slag discharge valve 50, the liquid replenishment capacity and the penetration of the flushing water curtain are enhanced, the coverage efficiency of the filter surface and the dead corners of the inner wall is improved, and the cleaning consistency is improved.

[0035] (iii) By setting a pressure gauge 90 near the feed side and linking it with the control unit, the cleaning timing can be automatically determined and the action can be interlocked, reducing manual intervention and ensuring the continuity and predictability of the filtration process.

[0036] Please see Figure 1 and Figure 2 An embodiment of this application also provides a method of using a slurry filter 100, including the following steps: S1: Open the feed valve 30 and discharge valve 40, and keep the purging valve assembly 70, slag discharge purging valve assembly 80, cleaning water inlet valve 60, and slag discharge valve 50 closed. This configuration creates a stable inlet and outlet channel for the slurry within the housing 10, reducing bypass interference. Simultaneously, by monitoring the pressure changes in the housing 10 through pressure gauge 90, the filter surface load and whether the cleaning stage is required can be determined, thus ensuring filtration quality while maintaining production cycle time.

[0037] S2: When cleaning is required, first close the feed valve 30, keep the discharge valve 40 open, and keep the slag discharge purge valve assembly 80, cleaning water inlet valve 60, and slag discharge valve 50 closed; then, start the purging purge valve assembly 70 in a pulse manner, using compressed air to purge the residual slurry in the housing 10 to the discharge path. After the pressure gauge 90 indicates that the pressure inside the housing 10 is close to 0, close the purging purge valve assembly 70 and the discharge valve 40 in sequence. Pulse purging can reduce residual adhesion and reduce the consumption and dilution effect of subsequent cleaning water.

[0038] S3: Open the cleaning water inlet valve 60 to allow the cleaning medium to enter from the top of the housing 10, soaking and rinsing the filter screen 20; close the cleaning water inlet valve 60 when the pressure gauge 90 indicates that the pressure inside the housing 10 is greater than 0 and remains stable. Top liquid inlet is beneficial for fully covering and wetting the filter surface, softening adsorbed particles, and improving the carry-out efficiency in the subsequent sludge discharge stage.

[0039] S4: Open the slag discharge purge valve assembly 80 to push the cleaning water and loosened particles in the shell 10 to a lower position. After the pressure gauge 90 indicates that the pressure has stabilized, open the slag discharge valve 50 to discharge the cleaning water and larger particle residues in the shell 10. By applying purging on the discharge side, the filter surface debris can be directionally transported to the slag discharge port, reducing re-deposition.

[0040] S5: When pressure gauge 90 indicates that the pressure inside housing 10 is close to 0, sequentially close the purging valve assembly 70 and the slag discharge valve 50. Depending on the cleanliness requirements of the filter screen 20, the aforementioned soaking and slag discharge purging steps can be repeated until the usage requirements are met. After the cycle is complete, reopen the feed valve 30 and discharge valve 40 to begin the next round of filtration. By cycling as needed, the filter surface permeability can be restored without disassembly, reducing downtime.

[0041] The purging valve 71 and the slag discharge purging valve 81 can be evenly distributed in an array on the outer surface of the corresponding sides of the housing 10. The arrayed layout makes the purging action more uniform and reduces the cleaning blind spots caused by local dead angles; the rated working pressure of the valve group is not less than 0.1MPa, which is conducive to maintaining sufficient purging intensity under different geometric arrangements.

[0042] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A self-cleaning slurry filter, characterized in that, include: A housing having an internal cavity; A filter screen is disposed within the housing, and the filter screen divides the inner cavity of the housing into opposing two-sided regions; The feed valve and the discharge valve are respectively disposed on both sides of the filter screen and are respectively connected to the inner cavity of the housing; Slag discharge valve, wherein the slag discharge valve is disposed at the bottom of the housing; A cleaning water inlet valve is provided on the top of the housing; Emptying and purging valve assembly, wherein the emptying and purging valve assembly is disposed on the side of the housing near the feed valve; A slag discharge purging valve assembly is disposed on the side of the housing near the discharge valve; as well as A pressure gauge is located on the top of the housing and near the feed valve.

2. The self-cleaning slurry filter according to claim 1, characterized in that: The filter screen has a planar or curved structure.

3. The self-cleaning slurry filter according to claim 1, characterized in that: The feed valve is located in the upper region of the housing and on one side of the filter screen, and the discharge valve is located in the bottom region of the housing and on the other side of the filter screen.

4. The self-cleaning slurry filter according to claim 1, characterized in that: The purge valve assembly includes multiple purge valves distributed in a planar pattern along the surface of the housing.

5. The self-cleaning slurry filter according to claim 1, characterized in that: The slag discharge purge valve assembly includes multiple slag discharge purge valves distributed in a planar pattern along the surface of the housing.

6. The self-cleaning slurry filter according to claim 1, characterized in that: The cleaning water inlet valve is located at the top of the housing and on the side of the discharge valve, and the slag discharge valve is located at the bottom of the housing and on the side of the inlet valve.

7. The self-cleaning slurry filter according to claim 1, characterized in that: The nominal diameter of the cleaning water inlet valve is larger than the nominal diameter of the slag discharge valve.

8. The self-cleaning slurry filter according to claim 1, characterized in that: The rated working pressure of the purging valve assembly and the slag discharge purging valve assembly is not less than 0.1 MPa.

9. The self-cleaning slurry filter according to claim 4 or 5, characterized in that: Multiple purge valves are evenly distributed on the outer surface of one side of the housing.

10. The self-cleaning slurry filter according to claim 4 or 5, characterized in that: Multiple slag discharge and purging valves are evenly distributed on the outer surface of the other side of the housing.

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