Self-cleaning blade strainer

Abstract

The utility model relates to the technical field of rough filter, concretely is self -cleaning formula scraper rough filter, including rough filter, and rough filter is mainly by motor, speed reducer and rough filter cylinder body is composed, the top of rough filter cylinder body is installed with speed reducer, the upside of speed reducer is connected with motor, the inside connection of rough filter cylinder body has the SLOT wedge filter screen, the bottom of motor is connected with central transmission shaft, the outside of central transmission shaft is provided with cleaning assembly. The utility model discloses a self -cleaning scraper rough filter through mechanical scraping principle, under the condition that does not interrupt the filtration process, the impurity that accumulated on the surface of filter element is removed automatically, realizes the continuous online filtration of true sense, and this kind of innovative design not only significantly reduces the artificial maintenance intensity, but also completely says goodbye to the operation mode of traditional filter relying on consumables, reduces the long -term operation cost simultaneously, also reduces the generation of solid waste, has the remarkable environmental protection benefit.

Description

Technical Field

[0001] This utility model relates to the field of coarse filter technology, specifically a self-cleaning scraper coarse filter. Background Technology

[0002] Self-cleaning scraper coarse filters, as a new type of high-efficiency filtration equipment, have demonstrated significant technological advantages and application value in the field of industrial fluid treatment in recent years. With the increasing demands of modern industry for continuous production, energy conservation and emission reduction, and operational cost control, the limitations of traditional filtration technologies are becoming increasingly apparent. These limitations mainly manifest as: the need for frequent filter element replacement, high manual cleaning intensity, frequent production interruptions, and the generation of large amounts of waste consumables. Especially when handling media with high viscosity, high solids content, or fibrous impurities, ordinary filters cannot even operate stably, severely restricting the improvement of production efficiency and economic benefits.

[0003] A search revealed patent application number (202121605512.2), which discloses "A self-cleaning mesh filter," comprising a filter body, a filter screen, a backwashing device, an inlet pipe, an outlet pipe, and a drain pipe. The filter screen is fixed inside the filter body, and the backwashing device is located inside the filter screen. The backwashing device includes a backwashing pipe and backwashing nozzles. The backwashing nozzles are evenly spaced axially and circumferentially on the outer wall of the backwashing pipe. The water outlet direction of the backwashing nozzles in the same circumferential direction is arranged in the same circumferential direction. The tangent at the connection between each backwashing nozzle and the backwashing pipe is parallel to the water outlet direction of the backwashing nozzle. Bearings are fixed at both ends of the filter body, and both ends of the backwashing pipe are fixed to the bearings. The inlet pipe and drain pipe are connected to the upper and lower ends of the side wall of the filter body, respectively. The outlet pipe is connected to the bottom of the filter body, and its diameter is connected to the backwashing pipe. This utility model adopts a hydraulically driven self-cleaning structure, which has a good flushing effect, high reliability, and a simple overall structure.

[0004] However, the above-mentioned device has the following problems: early self-cleaning filters mostly used backwashing technology, but the backwashing effect was often unsatisfactory for sticky materials or soft agglomerated impurities. Therefore, we proposed a self-cleaning scraper coarse filter to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a self-cleaning scraper coarse filter to solve the problem mentioned in the background art that early self-cleaning filters mostly used backwashing technology, but the backwashing effect was often unsatisfactory for sticky materials or soft agglomerated impurities.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a self-cleaning scraper coarse filter, comprising a coarse filter, the coarse filter mainly consisting of a motor, a reducer and a coarse filter cylinder, the reducer being installed on the top of the coarse filter cylinder, the motor being connected to the upper side of the reducer, a SLOT wedge-shaped filter screen being connected inside the coarse filter cylinder, a central drive shaft being connected to the bottom of the motor, and a cleaning assembly being provided on the outer side of the central drive shaft; The cleaning assembly includes a connecting plate and a scraper assembly. The connecting plate is provided on the outer side of the central drive shaft, and the scraper assembly is provided at the end of the connecting plate.

[0007] Preferably, the bottom of the connecting plate has a hole, a positioning rod is movably connected in the hole, a spring is movably sleeved on the outside of the positioning rod, and the two ends of the spring abut against the scraper assembly and the connecting plate respectively.

[0008] Preferably, a bearing housing is connected to the bottom of the central drive shaft, and the other side of the bearing housing is connected to the coarse filter cylinder.

[0009] Preferably, the SLOT wedge filter is made of stainless steel material through precision machining and has a V-shaped slit structure.

[0010] Preferably, the scraper assembly can be made of alloy steel, stainless steel / L or polymer materials such as PTFE, depending on the application conditions.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This utility model utilizes a self-cleaning scraper coarse filter that employs a mechanical scraping principle. Its core technology lies in using a specially designed cleaning component to automatically remove impurities accumulated on the surface of the filter element during the uninterrupted filtration process, achieving true continuous online filtration. This innovative design not only significantly reduces the intensity of manual maintenance but also completely eliminates the traditional filter's reliance on consumables. While reducing long-term operating costs, it also reduces the generation of solid waste, resulting in significant environmental benefits. Attached image description: 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 these drawings without creative effort.

[0012] Figure 1 This is a front view schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the cleaning component of this utility model; Figure 3 This is a schematic diagram of the operation process of this utility model.

[0013] In the diagram: 1. Motor; 2. Reducer; 3. Coarse filter cylinder; 4. Slot wedge filter screen; 5. Central drive shaft; 6. Connecting plate; 7. Spring; 8. Positioning rod; 9. Scraper assembly; 10. Bearing housing. Detailed implementation method: 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.

[0014] Please see Figure 1-3 This utility model provides an embodiment of a self-cleaning scraper coarse filter, comprising a coarse filter mainly composed of a motor 1, a reducer 2, and a coarse filter cylinder 3. The coarse filter adopts a modular structure design, integrating the cleaning components, filter element components, drive device, and control system into a compact unit. This design not only facilitates installation and maintenance but also optimizes functional allocation, offering significant advantages in structural integrity and space utilization. The filter typically employs a vertical flow design; liquid flows in from inlet A and passes through the filter screen from top to bottom or from inside to outside. Impurities are trapped on the filter screen surface, while the clean liquid flows to outlet B to flush away impurities. When washing, the valve on the bottom drain pipe is opened, and impurities are discharged from the filter through the drain port C. This flow path optimizes the impurity collection efficiency and creates favorable conditions for scraper cleaning. A reducer 2 is installed on the top of the coarse filter cylinder 3, and a motor 1 is connected to the upper side of the reducer 2. A SLOT wedge filter screen 4 is connected inside the coarse filter cylinder 3. A central drive shaft 5 is connected to the bottom of the motor 1, and a cleaning assembly is set on the outside of the central drive shaft 5. The cleaning assembly includes a connecting plate 6 and a scraper assembly 9. A connecting plate 6 is set on the outside of the central drive shaft 5, and a scraper assembly 9 is set at the end of the connecting plate 6. The scraper assembly 9 combines the blade holder and the scraper with bolts. Control System: The coarse filter is equipped with an advanced PLC control system, realizing fully automated operation of the cleaning process. The system integrates two modes: differential pressure control and timed control, with differential pressure taking priority. When the differential pressure between the filter inlet and outlet reaches the set value, the system automatically starts the cleaning program. Simultaneously, as a safety backup, the system can also perform cleaning at preset time intervals to ensure the filter remains unobstructed under any circumstances. This dual-protection mechanism greatly improves the reliability and adaptability of the equipment. Furthermore, the advanced system supports connection to a DCS central control room, enabling remote monitoring and data analysis, providing conditions for the digital upgrade of production management. Different levels of control functions can be configured according to user needs. The basic system is usually equipped with a differential pressure switch, which triggers the cleaning program when the differential pressure between the filter inlet and outlet reaches the set value, typically 0.05-0.1 MPa. The high-end system uses a diaphragm differential pressure transmitter, which is readily available in the market and can monitor and transmit differential pressure data in real time, offering higher sensitivity and reliability, facilitating remote monitoring and data analysis. The cleaning component is the core actuator of the self-cleaning coarse filter, and its performance directly determines the efficiency and reliability of the entire filtration system. It adopts a multi-scraper combination design, and through the precise cooperation of the connecting plate 6 and the scraper assembly 9, it achieves all-round cleaning of the surface of the SLOT wedge filter screen 4 and the inside of the filter holes. In terms of drive, the motor 1 and the reducer 2 provide stable torque to ensure that the scraper rotates at a uniform speed on the filter screen surface, and the scraping effect is uniform and thorough.

[0015] This device, through its cleaning components and control system, solves the problem that early self-cleaning filters, which mostly used backwashing technology, often had unsatisfactory backwashing effects for sticky materials or soft, agglomerated impurities.

[0016] Furthermore, the bottom of the connecting plate 6 has a hole, and a positioning rod 8 is movably connected inside the hole. A spring 7 is movably sleeved on the outside of the positioning rod 8, and the two ends of the spring 7 abut against the scraper assembly 9 and the connecting plate 6, respectively. Figure 2 As shown, this structure, through the pressure compensation design of spring 7, can automatically maintain the optimal contact pressure between the scraper assembly 9 and the surface of the SLOT wedge filter screen 4. This design not only ensures the scraping effect but also minimizes the wear of the scraper on the filter screen, significantly extending the service life of the filter screen. Especially when processing media containing hard particles, the pressure compensation mechanism can prevent excessive wear caused by particle embedding and maintain the stability of filtration accuracy.

[0017] Furthermore, a bearing housing 10 is connected to the bottom of the central drive shaft 5, and the other side of the bearing housing 10 is connected to the coarse filter cylinder 3. For example... Figure 2 As shown, this structure is used to connect the central drive shaft 5 to the reducer 2 and the bearing housing 10 at both ends, respectively, thereby improving the stability of the central drive shaft 5 under the action of the bearing housing 10.

[0018] Furthermore, the SLOT wedge filter 4 is precision-machined from 316L stainless steel and features a V-shaped slit structure. For example... Figure 1 As shown, this structure utilizes a V-shaped slit design, which, compared to traditional perforated filters, makes it less prone to trapping impurities and facilitates their removal under the action of the scraper, maintaining a stable filtration flow rate over the long term. The slit precision of the wedge-shaped filter is a key indicator of its performance. Furthermore, the filter surface undergoes a special hardening and wear-resistant treatment, ensuring it maintains its initial precision during long-term use and preventing performance degradation due to wear. In terms of structural strength, the V-SLOT filter element employs a high-strength design, capable of withstanding the pressure rise caused by filter cake accumulation, ensuring the slits do not deform under high pressure differential conditions. This characteristic allows the scraper filter to handle more demanding operating conditions, such as treating large amounts of solid impurities at the front end of wastewater treatment or handling high-viscosity slurries in chemical processes, while maintaining structural integrity and filtration reliability. Furthermore, the scraper assembly 9 can be made of alloy steel, 304 / 316L stainless steel, or polymer materials such as PTFE, depending on the application conditions. Figure 2 As shown, this structure is used for scraper assembly 9 to handle corrosive media. Stainless steel scrapers exhibit superior corrosion resistance; while in scenarios where metal contamination needs to be avoided, PTFE scrapers become the ideal choice. This material versatility allows scraper filters to adapt to a wider range of industrial applications.

[0019] Working principle: The control system provides three basic operating modes: Differential pressure cleaning, timed cleaning, and manual cleaning, such as Figure 3 As shown, when the differential pressure transmitter detects that the differential pressure reaches the set value of 100 kPa, the PLC sends a signal to execute the automatic cleaning program; the cleaning program is as follows: after receiving the signal, the PLC... Figure 1 and Figure 2As shown, starting motor 1 and reducer 2 causes the central drive shaft 5 to drive the scraper assembly 9 to rotate. When in contact with the SLOT wedge filter screen 4, the spring 7 pressure compensation design automatically maintains the optimal contact pressure between the scraper assembly 9 and the surface of the SLOT wedge filter screen 4. Simultaneously, the automatic valve of the bottom drain port is opened, and impurities are scraped off by the scraper and discharged from the bottom drain port. The normal filtration process of the filter is not affected during the cleaning program. The actions of timed cleaning and differential pressure cleaning are the same. The start of timed cleaning is also controlled by PLC. When the system runs for the cycle time set by PLC, the cleaning program starts automatically. Manual cleaning is performed manually. The motor 1 can be manually started and the drain valve opened to execute the cleaning program from the control screen of the central control. The differential pressure priority principle ensures that the cleaning operation is started only when needed, optimizing energy efficiency. In differential pressure mode, the system accurately judges the degree of impurity accumulation by monitoring the pressure difference on both sides of the filter screen in real time. When the set threshold is reached, the cleaning program is automatically started. This cleaning strategy based on actual needs avoids unnecessary mechanical wear and media loss.

[0020] The sewage discharge mechanism works in conjunction with the cleaning system to ensure that scraped impurities are discharged in a timely manner. A typical sewage discharge design uses a pneumatic ball valve as the discharge valve, which opens periodically under PLC control to discharge waste liquid containing high concentrations of impurities from the bottom of the system. This design not only achieves fully automatic operation but also ensures the airtightness of the operation process, preventing leakage of hazardous materials and contributing to safe production and environmental protection. For processes containing high-value materials, the discharged waste liquid can be recycled, reducing material loss and improving resource utilization. The above summarizes the entire working principle of this invention.

[0021] 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.

Claims

1. A self-cleaning scraper coarse filter, comprising a coarse filter, the coarse filter mainly consisting of a motor (1), a reducer (2), and a coarse filter cylinder (3), characterized in that: A speed reducer (2) is installed on the top of the coarse filter cylinder (3), and a motor (1) is connected to the upper side of the speed reducer (2). A SLOT wedge filter screen (4) is connected inside the coarse filter cylinder (3). A central drive shaft (5) is connected to the bottom of the motor (1), and a cleaning assembly is provided on the outside of the central drive shaft (5). The cleaning assembly includes a connecting plate (6) and a scraper assembly (9). The connecting plate (6) is provided on the outer side of the central drive shaft (5), and the scraper assembly (9) is provided at the end of the connecting plate (6).

2. The self-cleaning scraper coarse filter according to claim 1, characterized in that: The bottom of the connecting plate (6) has a hole, and a positioning rod (8) is movably connected in the hole. A spring (7) is movably sleeved on the outside of the positioning rod (8). The two ends of the spring (7) abut against the scraper assembly (9) and the connecting plate (6) respectively.

3. The self-cleaning scraper coarse filter according to claim 1, characterized in that: The bottom of the central drive shaft (5) is connected to a bearing seat (10), and the other side of the bearing seat (10) is connected to the coarse filter cylinder (3).

4. The self-cleaning scraper coarse filter according to claim 1, characterized in that: The SLOT wedge filter (4) is made of 316L stainless steel through precision machining and has a V-shaped slit structure.

5. The self-cleaning scraper coarse filter according to claim 1, characterized in that: The scraper assembly (9) can be made of alloy steel, stainless steel 304 / 316L or polymer materials such as PTFE, depending on the application conditions.

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