Centrifugal filtering device for solid-liquid mixed liquor

Abstract

The invention relates to a centrifugal filtration device for solid-liquid mixed liquor. The filtering device comprises a rack, a liquid inlet channel and a filter, the filter is provided with a filter cartridge capable of rotating around a supporting structure, a collecting shell and a backwashing nozzle are arranged outside the filter cartridge, and a residue receiving container and a residue discharging channel are arranged inside the filter cartridge. Waste liquid is injected into the filter cartridge through the liquid spraying pipe, the filter cartridge rotates to generate centrifugal force, the liquid and fine particles are pushed to be thrown out, separated through the filter screen and collected to the clean liquid water tank, and large particle impurities are attached to the filter screen, removed through the back-flushing spraying head and finally guided out through the residue receiving container and the residue discharging channel. And the discharged impurity mixture flow is further subjected to liquid separation through a two-stage vibrating screen and is subjected to reflux treatment, and solid residues are collected in a centralized manner.

Description

Technical Field

[0001] The invention relates to the technical field of filtering and separating solid-liquid mixtures, and in particular to a centrifugal filtering device for solid-liquid mixtures. Background Art

[0002] Various industrial processes, such as metalworking, glass processing, stone grinding, and chemical dispensing, often involve the handling of liquids containing solid particles. These liquids are typically solid-liquid mixtures containing a certain proportion of small particles, impurities, or residues. To achieve liquid recycling, ensure processing accuracy, and extend equipment life, efficient separation and filtration of these mixtures to remove large impurities while retaining the small, effective particles (small abrasives) is a critical step.

[0003] Common solid-liquid separation equipment in current industry includes: gravity sedimentation tanks, which use density differences for slow sedimentation and are suitable for mixed liquids with larger particle sizes, but have low filtration efficiency and occupy a large area. Static filter cloth / mesh filters achieve separation by intercepting solid particles, but are prone to clogging during use, and the cleaning or replacement of filter materials requires downtime. Centrifugal separators drive particle separation through the centrifugal force generated by high-speed rotation, have high separation efficiency, and are suitable for continuous operation. Rotary drum filter devices place the filter screen on the surface of the rotating drum, and use liquid injection and rotational motion to separate liquids and solids. It is a form of filtration that is both efficient and scalable.

[0004] In the aforementioned devices, the rotating drum structure has been widely researched and applied due to its continuous processing capacity and good adaptability. The applicant previously proposed a patent, "Filter Barrel Module, Polishing Liquid Filter, Polishing Liquid Purification System and Method," with authorization announcement number CN115837638B. This device, based on a rotating filter cartridge, injects waste liquid into the drum. As the drum rotates, the liquid and small particles are ejected, completing primary separation. Large impurities remain on the filter screen and are removed through a specially designed downtime cleaning process. To reduce downtime, the device further incorporates two filter cartridges that are used alternately, achieving basic continuous filtration.

[0005] However, existing drum filter equipment still has several structural and usability problems:

[0006] 1) In a single drum structure, filtering and cleaning cannot be performed at the same time, and the machine needs to be stopped to switch modes, which affects the continuity of filtration.

[0007] 2) Although the double-drum structure improves processing efficiency, the overall system becomes complex and bulky, the cost increases, and the equipment maintenance is inconvenient.

[0008] 3) The impurity cleaning process relies on internal adsorption devices and multi-step operations, which have problems such as complex structure and difficult to remove residues. Summary of the Invention

[0009] In view of the above-mentioned deficiencies or defects in the prior art, the present invention provides a centrifugal filter device for solid-liquid mixture, which includes a frame, a liquid inlet channel and a filter;

[0010] Wherein, the filter comprises:

[0011] A supporting structure is provided on the frame;

[0012] A filter cartridge, rotatable around the support structure, comprising two closed end faces and a filter screen area arranged in the circumferential direction, with a hollow interior;

[0013] A driving assembly, used for driving the filter cartridge to rotate;

[0014] a liquid injection pipe, connected to the liquid inlet channel, passing through the support structure, and used for injecting the solid-liquid mixture into the interior of the filter cartridge;

[0015] a backwash nozzle, disposed outside the filter cartridge and configured to spray a cleaning fluid toward the filter area;

[0016] A slag collecting container is provided inside the filter cartridge and below the injection path of the backwash nozzle, and is used to collect impurities stripped during the cleaning process;

[0017] A slag discharge channel is communicated with the slag receiving container and passes through the support structure and extends to the outside of the filter cartridge for discharging impurities;

[0018] The collecting shell is arranged outside the filter cartridge and is used to collect the clean liquid thrown out by the filter cartridge. The bottom of the collecting shell is provided with a clean liquid outlet.

[0019] In some embodiments, the filter cartridge is disposed transversely, and the filter screen area thereof includes a support frame disposed in a circumferential direction. The filter screen covers the outside of the support frame and is detachably connected thereto.

[0020] In some embodiments, the liquid spraying pipe is arranged along the generatrix direction of the filter cartridge and is provided with a plurality of liquid outlets for uniformly spraying the solid-liquid mixture onto the inner wall surface of the filter cartridge.

[0021] In some embodiments, the backwash nozzles are provided in plurality and arranged along the axial direction of the filter cartridge to achieve full coverage cleaning of the filter screen area.

[0022] In some embodiments, the backwash nozzle is connected to an independently provided backwash liquid supply assembly, and the backwash liquid supply assembly includes a clean liquid container and a high-pressure pump for providing cleaning liquid to the backwash nozzle.

[0023] In some embodiments, the support structure includes fixed shaft seats arranged at both ends, and the two ends of the filter cylinder are rotatably connected to the shaft seats through bearings respectively. The spray pipe passes through one end shaft seat and extends into the interior of the filter cylinder, and the slag discharge channel passes through the other end shaft seat to realize impurity discharge.

[0024] In some embodiments, the slag discharge channel is connected to a vibrating screen assembly for performing solid-liquid separation on the discharged impurity mixture, and the vibrating screen assembly includes a linear vibrating screen and a circular vibrating screen, and the outlet of the linear vibrating screen is aligned with the inlet of the circular vibrating screen; the separated liquid is introduced into the waste liquid pool, and the solid is removed directly or by replacing the screen bucket.

[0025] In some embodiments, the vibrating screen assembly is connected to a waste liquid pool, in which a stirring device is provided and connected to the liquid inlet channel via a reflux line, for redirecting the liquid in the waste liquid pool into the filter cartridge for circulation treatment.

[0026] The solid-liquid mixture centrifugal filtration device using the above technical solution of the present invention has the following effects:

[0027] The present invention provides a centrifugal filter for solid-liquid mixtures. This device utilizes a rotatable filter cartridge structure with an external backwash nozzle. This, combined with an internal slag collection container and slag discharge channel, enables simultaneous filtration and cleaning. Compared to existing designs that alternate between filtering and cleaning, the present invention allows for continuous, uninterrupted filtration, significantly improving overall filtration efficiency.

[0028] Traditionally, to achieve non-stop filtration, dual filter drums are required to alternate between cleaning and filtering. This results in a complex system structure, large equipment footprint, and high manufacturing and maintenance costs. However, this invention integrates backwashing functionality into a single drum structure and designs a clear and reliable impurity collection path, eliminating the need for vulnerable components such as adsorption heads. This simplifies the system structure while improving equipment stability and service life.

[0029] Specifically, backwash nozzles spray cleaning fluid from the outside of the drum inward, effectively removing large impurities from the filter screen. These impurities fall directly into a pre-set slag collection container within the filter cartridge, where they are promptly discharged through an axially extending slag discharge channel, effectively preventing filter clogging. The rotation of the filter cartridge, combined with the axially arranged multi-point spray pipes and backwash nozzles, ensures a comprehensive effect on the entire filter screen surface, thereby improving the uniformity and efficiency of solid-liquid separation.

[0030] In addition, the device supports the filter screen with a removable support frame structure, making it easy to clean and replace, enhancing the device's maintainability. The collection shell covers the entire filter cartridge, effectively preventing liquid splashing and guiding the liquid to the clean liquid outlet below, facilitating centralized liquid management and subsequent utilization.

[0031] In summary, the filtering device of the present invention has a compact structure and high functional integration. It can be widely used in the processing scenarios of various industrial solid-liquid mixtures such as polishing fluid, cutting fluid, emulsion, etc. While improving the filtration efficiency, it reduces the equipment use cost and maintenance complexity, and has good promotion and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural stereogram of a solid-liquid mixture centrifugal filtration device of the present invention;

[0033] Figure 2 yes Figure 1 A three-dimensional image from another angle;

[0034] Figure 3 It is a three-dimensional schematic diagram of the filter and its internal structure;

[0035] Figure 4 This is a schematic diagram of the internal core part of the filter after removing the collection shell;

[0036] Figure 5 yes Figure 4 sectional view of

[0037] Figure 6 This is a schematic diagram of the working principle of the filter;

[0038] Figure 7 It is a three-dimensional diagram of the vibrating screen assembly.

[0039] Description of Reference Numerals

[0040] 1- rack;

[0041] 2-liquid inlet channel;

[0042] 3-filter; 3a-support structure; 3b-filter cartridge, 3b1-support frame; 3c-drive assembly; 3d-spray pipe; 3e-backwash nozzle; 3f-slag container; 3g-slag discharge channel; 3h-collection shell;

[0043] 4-Backwash liquid supply assembly;

[0044] 5-vibrating screen assembly, 5a-linear vibrating screen, 5b-circular vibrating screen;

[0045] 6-waste liquid pool;

[0046] 7-Return line. DETAILED DESCRIPTION

[0047] The following is a detailed description of the specific embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0048] In the present invention, unless otherwise specified, directional terms such as "upper" and "lower" generally refer to directions in the assembled state. "Inside" and "outside" refer to inside and outside relative to the outline of each component itself.

[0049] The present invention provides a centrifugal filtration device for solid-liquid mixtures, specifically a centrifugal filtration device capable of continuous filtration and synchronous self-cleaning. Through the coordinated operation of a rotary filter cartridge 3b and a backwash mechanism, this device can continuously remove impurities from the filter screen without interrupting the filtration process. It is suitable for filtering a variety of solid waste liquids, such as polishing fluids, coolants, and cleaning fluids. It can also be applied to other industrial fields requiring solid-liquid separation. Compared with traditional intermittent filtration solutions, this device offers significant technical advantages, including high operating efficiency, strong filtration continuity, and low maintenance frequency.

[0050] The solid-liquid mixture centrifugal filtration device mainly comprises a frame 1, a liquid inlet channel 2 and a filter 3.

[0051] Frame 1 provides the basic support and structural mounting platform for the entire filtration unit. It is a rigid frame structure constructed from welded or assembled carbon steel, stainless steel, or aluminum alloy profiles, offering excellent deformation and corrosion resistance. Frame 1 is typically box-shaped or open-frame, with mounting holes or feet at the bottom. Anchor bolts secure the unit to the ground, ensuring operational stability.

[0052] Structurally, a support frame is installed on top of the frame 1 to support the support structure 3a and collection housing 3h, as well as other pipes, motors, agitators, etc. The mounting surface of the support structure 3a is machined and positioned to ensure coaxiality with the drive assembly 3c and the liquid inlet assembly, thereby improving the transmission accuracy and sealing effect of the entire device.

[0053] In addition, the frame 1 may be provided with an inspection door or a pull-out rail for easy maintenance, which is used to install or remove modular components such as the filter 3, the vibrating screen assembly 5, and the backwash liquid supply assembly 4, thereby improving the maintenance convenience and scalability of the entire machine.

[0054] Liquid inlet channel 2 (see attached Figure 1-Figure 3) is connected to the liquid spray pipe 3d of the filter 3, which is used to uniformly introduce the impurity-containing waste liquid generated by multiple external processing equipment into the filtration device. The liquid inlet channel 2 is usually connected to multiple liquid-using stations or industrial equipment that generates waste liquid through pipelines to form a centralized waste liquid transportation network. Through the liquid inlet channel 2, the waste liquid is collected and stably transported to the liquid spray pipe 3d of the filter 3, realizing the unified treatment of the solid-liquid mixed liquid flow, effectively improving the centralization and management efficiency of the system operation. The structure of the liquid inlet channel 2 can be flexibly configured according to the factory layout, and has good adaptability and scalability.

[0055] Filter 3 (see attached Figure 3-Figure 6 ) is the core component of this device, responsible for completing the filtration of solid-liquid mixture and separation of impurities. Its overall structure is built around a rotatable filter barrel 3b, and the filter barrel 3b is stably supported and maintains rotatability through a support structure 3a provided on the frame 1. The solid-liquid mixture flows through the liquid spray pipe 3d and is injected into the interior of the filter barrel 3b. Driven by the drive component 3c, the filter barrel 3b rotates, generating centrifugal force to throw the liquid and fine particles out of the barrel, and the clean liquid is uniformly collected by the collection shell 3h provided on the outside. Larger solid impurities are retained on the filter screen surface inside the filter barrel 3b, and are separated from the filter screen surface under the continuous spraying action of the backwash nozzle 3e, and finally fall into the internal slag receiving container 3f and are discharged through the slag discharge channel 3g.

[0056] The filter 3 has a compact structure and high efficiency, and can realize the simultaneous filtration and cleaning process without alternating shutdowns, effectively improving the continuous operation capacity and solid-liquid separation efficiency. The filter 3 mainly includes the following functional modules:

[0057] Support structure 3a: Support structure 3a is one of the key load-bearing components of the filter 3. Its main function is to provide stable support for the filter cartridge 3b so that the filter cartridge 3b can rotate around its axis, and at the same time provide a penetration path for the liquid spray pipe 3d and the slag discharge channel 3g. It is arranged on the frame 1 and fixedly connected to the frame 1.

[0058] This application provides two embodiments of the support structure 3a.

[0059] Example 1 (see Figure 4-Figure 6 ), the support structure 3a comprises a hollow, fixed long shaft mounted on the frame 1. The filter cartridge 3b is mounted on the outside of the long shaft via a bearing and can rotate freely relative to the long shaft. The liquid injection pipe 3d runs along the axis of the long shaft, and the slag discharge channel 3g is led out from the other end of the long shaft, resulting in a compact structure that is easy to integrate.

[0060] Example 2: The support structure 3a consists of two fixed mounting blocks at either end of the filter cartridge 3b, each rotatably connected to the two mounting blocks via bearings. The liquid spray pipe 3d and slag discharge channel 3g are respectively inserted through the two mounting blocks, forming a symmetrical support structure 3a that facilitates maintenance and assembly and disassembly.

[0061] Regardless of which of the above embodiments is adopted, the support structure 3a remains stationary and does not rotate with the filter cartridge 3b, thereby providing a stable platform for functions such as liquid spraying and slag discharge.

[0062] Filter cartridge 3b: Filter cartridge 3b is the core component for achieving solid-liquid separation in the solid-liquid mixture centrifugal filtration device of the present invention. The solid-liquid mixture is sprayed onto the inner wall of the filter cartridge 3b by the liquid spray pipe 3d. Driven by the drive assembly 3c, the filter cartridge 3b rotates, and the mixture is thrown outward under the action of centrifugal force. The liquid and small particles pass through the filter screen and are thrown out of the cylinder, and are introduced into the clean liquid outlet by the collection shell 3h, while impurities with larger particles are blocked on the inside of the filter screen. Compared with the static filtration structure, this centrifugal lateral filtration method has stronger particle separation ability and filtration efficiency and is not easily affected by the clogging of the filter screen, which causes the flow rate to drop.

[0063] The filter cartridge 3b is arranged horizontally and is cylindrical in shape as a whole. Both ends of the axial direction are closed, and a filter area is arranged circumferentially. The interior is a cavity structure for accommodating the injected solid-liquid mixture and achieving separation during the rotation process.

[0064] The circumference of the filter cartridge 3b comprises a skeletal support structure 3a and a filter screen covering its outer surface. The support structure 3b1 can be composed of metal ribs, a mesh frame, or a multi-ring structure to withstand the centrifugal loads generated during rotation, ensuring that the filter screen does not deform or break under high-speed operation. The filter screen is made of wear- and corrosion-resistant stainless steel woven mesh or sintered metal mesh. Its filtration accuracy can be set to between 10μm and 20μm depending on the application requirements, effectively filtering out large impurities while retaining fine particles for reuse as an effective abrasive.

[0065] In order to facilitate later cleaning, replacement or adjustment of the filtration accuracy according to the usage scenario, the filter screen is detachably mounted on the outer surface of the support frame 3b1 through a clamp, screw connection or snap structure.

[0066] The filter cartridge 3b is provided with axial holes at both ends, which are rotatably connected to the support structure 3a. Specifically, in embodiments employing a hollow long shaft structure, the axial holes at both ends of the filter cartridge 3b are sleeved onto the support shaft, with rolling bearings disposed between the axial holes and the shaft, enabling low-resistance rotation of the filter cartridge 3b relative to the support shaft. In embodiments employing a double-ended mounting seat structure, the ends of the filter cartridge 3b are connected to the fixed mounting seat via bearings. The bearings can be nested within the bearing seat structure at the ends of the filter cartridge 3b, supported by the mounting seat, or they can be disposed within the mounting seat, with the ends of the filter cartridge 3b forming a shaft segment that is inserted therein.

[0067] To prevent liquid or fine particles from penetrating the bearing area during the filtration process, affecting lubrication and bearing life, the bearing area is equipped with multiple sealing components. Common sealing structures include skeleton oil seals, labyrinth seals, and floating seals. Oil deflectors and cleaning rings can also be used to create a barrier between liquid, impurities, and grease.

[0068] Drive assembly 3c: Drive assembly 3c is the power source for realizing the rotational motion of filter cartridge 3b. It can provide stable and adjustable speed output to meet the separation requirements of different solid-liquid mixtures.

[0069] exist Figure 4-Figure 6 In the embodiment, the drive assembly 3c includes a speed-regulating motor mounted on the frame 1. The motor automatically adjusts its speed based on the operating state to meet the centrifugal force requirements under different operating conditions. The output shaft of the motor is connected to one end of the filter cartridge 3b via a belt drive or gear drive mechanism to achieve rotational drive of the filter cartridge 3b.

[0070] When using a belt drive, the drive motor is equipped with a driving pulley, and the filter cartridge 3b is equipped with a driven pulley. The two are connected by a tensioning belt. This simple structure is easy to maintain and has a certain degree of cushioning and shock absorption. When using a gear drive, the meshing gears are directly connected to the filter cartridge 3b shaft end, which has high transmission efficiency and is suitable for high-load continuous operation scenarios.

[0071] To enhance operational safety and regulation accuracy, drive assembly 3c can also be used in conjunction with a frequency converter or servo drive system to achieve smooth startup, adjustable speed, and overload protection. Overall, drive assembly 3c ensures stable, controllable, and efficient rotation of filter cartridge 3b, a key factor in achieving continuous centrifugal filtration.

[0072] Liquid spray pipe 3d: The liquid spray pipe 3d is a fixed component. Its structure passes through the support structure 3a and extends into the filter cartridge 3b. Its main function is to evenly inject the solid-liquid mixed waste liquid collected from the outside into the filter cartridge 3b during the filtration process, thereby achieving efficient and continuous solid-liquid separation.

[0073] Liquid spray pipe 3d is preferably positioned along the rotation axis of filter cartridge 3b, coaxially with the axis of filter cartridge 3b and extending axially. One end of its exterior is connected to liquid inlet channel 2, while the other end is fixed to the center of support structure 3a and extends into the cavity of filter cartridge 3b. Because liquid spray pipe 3d does not rotate with filter cartridge 3b, it remains relatively stationary during high-speed rotation, providing a continuous and stable supply of liquid to the interior of filter cartridge 3b.

[0074] To improve the uniformity of liquid distribution and align with the principle of centrifugal separation, the outlet of the spray pipe 3d is preferably located on the lower sidewall of the spray pipe 3d. Multiple outlets are evenly spaced along the axis of the spray pipe 3d, with the spray direction being essentially vertically downward, allowing the waste liquid to be evenly distributed onto the inner surface of the filter along the generatrix of the filter cartridge 3b. This design not only avoids blind spots in the spray, but also enhances the effect of the liquid spreading out to form a thin film during rotation, facilitating the rapid application of centrifugal force between the liquid and solid phases, thereby improving filtration efficiency.

[0075] Furthermore, the liquid spray pipe 3D can be manufactured from corrosion-resistant materials and, when necessary, is removable for easy maintenance, flushing, and cleaning, preventing impurities from clogging the nozzle. The overall design balances structural stability with fluid distribution performance, making it a key channel component for ensuring the efficient and continuous operation of the device.

[0076] Backwash nozzle 3e and slag container 3f (see attached Figure 4-6 ): The backwash nozzle 3e and the slag receiving container 3f provided in the present invention cooperate as a closed-loop cleaning-collection module, aiming to realize the online self-cleaning function of the filter screen on the inner wall of the filter cylinder 3b, and to realize the effective stripping and discharge of large particle impurities without interfering with the normal filtering operation, thereby overcoming the structural problem in the prior art that filtering and cleaning cannot be carried out simultaneously.

[0077] Backwash nozzles 3e are mounted externally to filter cartridge 3b, preferably fixed to the frame 1 or the upper portion of support structure 3a. They are radially spaced from filter cartridge 3b and do not rotate with it. Multiple nozzles are equally spaced along the axial direction of filter cartridge 3b, arranged in a straight line or in an arc along its upper generatrix, ensuring that the spray area covers the entire filter screen area, particularly the entire circumferential filter screen surface.

[0078] The nozzle of the backwash nozzle 3e is directed toward the circumferential surface of the filter cartridge 3b, with the spray direction perpendicular or nearly perpendicular to the outer surface of the filter screen. The nozzle's spray medium comes from a separate backwash liquid supply assembly 4, which includes a clean liquid container and a high-pressure pump. This pump draws and pressurizes clean liquid from the clean liquid tank and delivers it to the nozzle through a pipeline. The cleaning liquid sprayed from the nozzle has a specific flow rate and pressure to effectively impact and remove medium and large particles of impurities such as shavings, metal powder, glass particles, and polishing residue adhering to the inner wall of the filter screen.

[0079] The centrifugal force generated by the rotation of filter cartridge 3b causes these impurities to adhere to the inner surface of the filter screen. Without intervention, they can easily clog the mesh and reduce filtration efficiency. Backwash nozzle 3e uses a targeted spray to actively "penetrate" the filter screen, knocking particles off the inner wall and into the cartridge cavity, thus achieving in-line cleaning.

[0080] To simultaneously collect and discharge impurities, a slag collection container 3f is located inside the filter cartridge 3b. This container is stationary and preferably positioned directly below the nozzle's spray path, coinciding with the natural falling path of impurities after being ejected. The slag collection container 3f typically has an arc-shaped trough structure, covering approximately 1 / 3 to 1 / 2 of the circumference of the filter's inner wall below, with an upward opening to receive impurities.

[0081] To guide the discharge of impurities, the bottom of the slag receiving container 3f is formed with a diversion slope or a conical convergent cavity, the lowest point of which is opened and connected to the slag discharge channel 3g. The slag discharge channel 3g further penetrates the support structure 3a and extends to the outside of the filter cartridge 3b.

[0082] Its working mode is as follows: (a) while the filter cartridge 3b is filtering, impurities continuously accumulate on the inner wall of the filter screen during the filtering process; (b) the backwash nozzle 3e continuously sprays to flush and remove the impurities; (c) the impurities continuously fall under the combined action of gravity and the impact force of the jet from the backwash nozzle 3e; (e) the impurities fall into the slag receiving container 3f and are collected; (f) the impurities are discharged from the filter 3 through the slag discharge channel 3g and sent to the subsequent vibrating screen device for further processing.

[0083] In this way, uninterrupted filtering operation is achieved. The backwash nozzle 3e and the slag receiving container 3f are both fixed structures and do not interfere with the rotation of the filter cartridge 3b, so that the three functions of filtering, cleaning and slag discharge can be carried out simultaneously, significantly improving the system's working efficiency.

[0084] The combination of backwashing and slag receiving container 3f has the following beneficial effects:

[0085] Fine particles are retained and large particles are removed: The cleaning process can accurately remove large particles of impurities on the filter without damaging the working particles below 10μm passing through the filter, ensuring the reuse quality of application scenarios such as polishing liquid.

[0086] Extended maintenance cycle: Automated online cleaning reduces the frequency of manual maintenance, reduces downtime, and extends the service life of the filter.

[0087] The impurity path is clear to prevent backflow pollution: the cleaning impurities and the liquid flow path are physically separated in the structure, preventing impurities from running around in the filter cartridge 3b and causing secondary pollution.

[0088] The number and arrangement of the backwash nozzles 3e can be adaptively adjusted according to the length, rotation speed, and impurity concentration of the filter cartridge 3b to improve the scope of application.

[0089] Slag discharge channel 3g: It is used to smoothly guide the solid impurities collected in the slag receiving container 3f out of the filter barrel 3b, thereby achieving centralized removal of impurities. One end of the channel is connected to the bottom of the slag receiving container 3f, and the other end passes through the support structure 3a and extends to the outside of the filter 3, forming an independent, closed discharge path. The channel is usually a tubular structure. To prevent liquid leakage and contamination of bearings or other structural components during the slag discharge process, the shaft is equipped with a seal. The slag discharge channel 3g can be discharged by natural gravity, or it can be connected to the vibrating screen assembly 5 to further achieve solid-liquid separation.

[0090] Collection housing 3h: Located outside the filter cartridge 3b, collection housing 3h receives and collects the clean liquid ejected from the filter cartridge 3b during the filtration process, preventing splashing and contaminating the surrounding environment. It also directs the clean liquid to the clean liquid tank below. This housing typically utilizes a closed structure, enclosing the outer perimeter of the filter cartridge 3b. A clean liquid outlet is located at the bottom, and depending on the overall layout of the filtration unit, it can be directly connected to the clean liquid tank inlet, enabling gravity-fed collection of the clean liquid. The housing's shape can be customized to the dimensions of the filter cartridge 3b, providing excellent sealing and adaptability, making it a crucial supporting structure for achieving an efficient and clean filtration environment.

[0091] Vibrating screen assembly 5 (see attached Figure 7 ) is an important unit for subsequent treatment of impurity mixtures in the filtration system of the present invention. Its main function is to perform solid-liquid separation on the impurity flow continuously discharged from the filter 3, further recover the residual liquid therein, improve resource utilization, and realize centralized management of solid impurities.

[0092] This assembly comprises a two-stage structure consisting of a linear vibrating screen 5a and a circular vibrating screen 5b. The impurity mixture first enters the linear vibrating screen 5a, where it undergoes preliminary separation. The liquid portion seeps out from beneath the screen and is collected in a waste liquid tank 6. Coarser solid impurities are then transferred to the circular vibrating screen 5b for further screening to remove any entrained liquid. After these two stages of screening, the solid impurities contain very low liquid content and can be collected and periodically removed manually or automatically.

[0093] At the same time, the vibrating screen assembly 5 is connected to the waste liquid tank 6 and the return line 7 to realize the recycling of liquid, forming a closed treatment cycle. This structure ensures the timely treatment of impurities during the continuous operation of the filter 3 and the high efficiency and stability of the entire system.

[0094] The vibrating screen assembly 5 consists of a linear vibrating screen 5a and a circular vibrating screen 5b, both of which are mounted on the frame 1 via spring supports, effectively isolating and reducing vibration transmission during operation. Each vibrating screen is equipped with a dedicated vibration motor. The periodic vibration generated by the motor causes the material to continuously bounce and move on the screen, thereby achieving solid-liquid separation.

[0095] The linear vibrating screen 5a features a slightly inclined mesh structure. Liquid impurities, driven by vibration and gravity, seep down the inclined surface into the collection trough below. From there, they are piped into a waste liquid tank, effectively separating liquids and solids. This design facilitates continuous and stable material flow and liquid discharge.

[0096] After separation, solids can be removed directly from the filter screen, for example by manually shoveling them; alternatively, the solids can be removed from the device by replacing the screen bucket. The circular vibrating screen 5b features a removable screen, allowing for easy regular replacement and cleaning, improving maintenance efficiency. The circular vibrating screen 5b further dehydrates impurities through rotational vibration, ensuring a low moisture content in the discharged solids, facilitating subsequent processing and transportation. Liquid discharged from the circular vibrating screen 5b is also directed to a waste tank.

[0097] Wastewater tank 6: This is the container in the filtration system used to collect and temporarily store the liquid portion containing residual impurities discharged from the vibrating screen assembly 5. A stirring device is installed within wastewater tank 6 to prevent impurities from settling, maintain liquid uniformity, and ensure stable liquid quality. This stirring keeps the liquid in wastewater tank 6 continuously flowing, facilitating subsequent processing and recycling.

[0098] Return line 7: This connects waste liquid reservoir 6 to the liquid inlet channel 2 of filter 3, enabling the circulation of liquid within waste liquid reservoir 6. Through pumping or natural flow, the waste liquid is transported through return line 7 back to the interior of filter cartridge 3b for refiltration, forming a closed-loop circulation system. This design effectively reduces waste liquid emissions, improves resource utilization, and enhances the system's environmental performance and economic benefits.

[0099] The solid-liquid mixture centrifugal filtration device and liquid supply system of the present invention can be integrated into a comprehensive treatment solution, aiming to achieve efficient filtration, concentration adjustment, and circulating liquid supply of the solid-liquid mixture. The device primarily comprises a filtration system and a liquid supply system. The liquid supply system includes a clean liquid tank, a liquid supply pipeline assembly 9, a concentrate tank, a clean water tank 10, and a control system.

[0100] Among them, the filtration system is the solid-liquid mixture centrifugal filtration device proposed in the previous part of the present invention, which can continuously and efficiently separate solid impurities from liquid in the waste liquid, ensuring the continuity and stability of the filtration process.

[0101] Working process:

[0102] (1) Waste liquid collection and injection into filter 3: Solid-liquid mixtures containing solid impurities from multiple processing equipment are collected centrally through a uniformly arranged liquid inlet channel 2 and transported to filter 3. Liquid inlet channel 2 is connected to the liquid spray pipe 3d inside the filter 3. The side wall of the liquid spray pipe 3d is provided with multiple nozzles distributed along the axial direction, and the waste liquid is evenly sprayed onto the inner wall of the filter cylinder 3b.

[0103] (2) Centrifugal filtration and liquid-solid separation: Driven by the drive assembly 3c, the filter cartridge 3b rotates around the support structure 3a, generating centrifugal force. Driven by the centrifugal force, the liquid and tiny particles pass through the filter mesh area and are thrown out to the outside of the filter cartridge 3b. They are then collected by the collection housing 3h and flow into the clean liquid tank below. Larger particles of impurities are trapped on the filter mesh inside the filter cartridge 3b, forming filter residue.

[0104] (3) Synchronous backwashing and slag discharge: The backwash nozzle 3e is located directly above the outside of the filter cartridge 3b and continuously sprays high-pressure cleaning fluid onto the filter surface, removing impurities adhering to the filter surface. The washed impurities fall directly into the slag receiving container 3f located inside the filter cartridge 3b and are then discharged from the filter cartridge 3b through the slag discharge channel 3g.

[0105] (4) Impurity solid-liquid separation and waste liquid recovery: The discharged impurity mixture enters the vibrating screen assembly 5 through the slag discharge channel 3g. The linear vibrating screen 5a performs preliminary separation of the liquid-solid mixture. The liquid is recovered through the screen mesh, and the solid residue is transported to the circular vibrating screen 5b. The secondary screen further reduces the liquid content in the solid. The solid part is collected and regularly cleaned, and the liquid flows into the waste liquid tank 6.

[0106] The waste liquid pool 6 is equipped with a stirring device to prevent sedimentation, and the waste liquid is guided back to the inlet of the filter 3 through the reflux pipe 7 to form a closed-loop circulation treatment.

[0107] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0108] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0109] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A centrifugal filter device for solid-liquid mixture, characterized in that: It comprises a frame (1), a liquid inlet channel (2) and a filter (3); Wherein, the filter (3) comprises: A supporting structure (3a) is arranged on the frame (1); A filter cartridge (3b) is rotatable around the support structure (3a), the filter cartridge (3b) comprising two closed end surfaces and a filter screen area arranged in the circumferential direction, and an interior thereof being a cavity structure; A driving assembly (3c) for driving the filter cartridge (3b) to rotate; a liquid spray pipe (3d), which is in communication with the liquid inlet channel (2), is provided through the support structure (3a), and is used to inject the solid-liquid mixture into the interior of the filter cartridge (3b); A backwash nozzle (3e) is arranged outside the filter cartridge (3b) and is used to spray cleaning liquid toward the filter screen area; a slag collecting container (3f), arranged inside the filter cartridge (3b), located below the spray path of the backwash nozzle (3e), and used for collecting impurities stripped off during the cleaning process; a slag discharge channel (3g), which is in communication with the slag receiving container (3f), passes through the support structure (3a) and extends to the outside of the filter cartridge (3b), and is used for discharging impurities; A collecting shell (3h) is provided on the outside of the filter cartridge (3b) and is used to collect the clean liquid thrown out by the filter cartridge (3b). A clean liquid outlet is provided at the bottom of the collecting shell (3h).

2. The solid-liquid mixture centrifugal filter device according to claim 1, characterized in that: The filter cartridge (3b) is arranged transversely, and its filter screen area includes a support frame (3b1) arranged in the circumferential direction. The filter screen covers the outside of the support frame (3b1) and is detachably connected thereto.

3. The solid-liquid mixture centrifugal filter device according to claim 1, characterized in that: The liquid spray pipe (3d) is arranged along the generatrix direction of the filter cartridge (3b) and is provided with a plurality of liquid outlets for uniformly spraying the solid-liquid mixture onto the inner wall surface of the filter cartridge (3b).

4. The solid-liquid mixture centrifugal filter device according to claim 1, characterized in that: The backwash nozzles (3e) are provided in plurality and arranged along the axial direction of the filter cartridge (3b) to achieve full coverage cleaning of the filter screen area.

5. The solid-liquid mixture centrifugal filtration device according to claim 1, characterized in that: The backwash nozzle (3e) is connected to an independently arranged backwash liquid supply assembly (4), and the backwash liquid supply assembly (4) comprises a clean liquid container and a high-pressure pump, and is used to supply cleaning liquid to the backwash nozzle (3e).

6. The solid-liquid mixture centrifugal filtration device according to claim 1, characterized in that: The support structure (3a) comprises fixed shaft seats provided at both ends, and both ends of the filter cartridge (3b) are rotatably connected to the shaft seats via bearings, the liquid spraying pipe (3d) passes through the shaft seat at one end and extends into the interior of the filter cartridge (3b), and the slag discharge channel (3g) passes through the shaft seat at the other end to discharge impurities.

7. The solid-liquid mixture centrifugal filtration device according to claim 1, characterized in that: The slag discharge channel (3g) is connected to a vibrating screen assembly (5) for performing solid-liquid separation on the discharged impurity mixture, wherein the vibrating screen assembly (5) comprises a linear vibrating screen (5a) and a circular vibrating screen (5b), wherein the outlet of the linear vibrating screen (5a) is aligned with the inlet of the circular vibrating screen (5b); the separated liquid is introduced into a waste liquid pool (6), and the solid is removed directly or by replacing the screen bucket.

8. The solid-liquid mixture centrifugal filtration device according to claim 7, characterized in that: The vibrating screen assembly (5) is connected to a waste liquid pool (6), wherein a stirring device is provided in the waste liquid pool (6) and is connected to the liquid inlet channel (2) via a reflux line (7) for re-introducing the liquid in the waste liquid pool (6) into the filter cartridge (3b) for internal circulation treatment.

Images