Filtering mechanism for sewage treatment

Abstract

The application discloses a filtering mechanism for sewage treatment and belongs to the technical field of sewage treatment, which comprises a shell, a filter screen, an impeller, a filter plate and a cleaning assembly. An inlet pipe is arranged on the outer wall of the shell and is communicated with an external water supply system. The filter screen is arranged in the inlet pipe. The impeller is arranged in the shell and rotates relative to the shell by the sewage output by the inlet pipe. A liquid outlet is formed in the bottom of the shell. The impeller is in transmission connection with the cleaning assembly. The filter plate is arranged opposite to the liquid outlet. The flowing kinetic energy of the sewage flowing into the tank is utilized to drive the cleaning assembly, and the impurities on the filter plate are cleaned. The overall structure is simplified, the automatic cleaning of the filter plate can be realized without an external power source, the operation and maintenance cost and the labor intensity of workers are remarkably reduced, the sewage treatment process is not interrupted when the filter plate is cleaned, the sewage treatment efficiency is improved, and the filtering mechanism is especially suitable for remote areas or unstable power supply sewage treatment scenes.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a filtration mechanism for wastewater treatment. Background Technology

[0002] In the field of wastewater treatment technology, filtration is a crucial step in removing suspended impurities from wastewater and ensuring the effectiveness of subsequent treatment. It is widely used in various wastewater treatment tanks such as aeration tanks and sedimentation tanks. Currently, most wastewater treatment filtration systems on the market use fixed filter plates or screens as the core filtration components, achieving the separation of impurities from wastewater through the interception effect of the filter media.

[0003] However, existing filtration mechanisms have many problems that urgently need to be solved in actual operation: First, after long-term use, a large amount of impurities tend to accumulate on the surface of the filter plates. If not cleaned in time, this will cause blockage of the filter pores, significantly reduce filtration efficiency, and even affect the operational stability of the entire sewage treatment system. Second, the cleaning methods of existing filtration mechanisms mostly rely on manual periodic disassembly and cleaning or the use of externally powered cleaning components. For example, the sewage treatment aeration tank disclosed by the applicant in patent publication number CN212640212U can clean the filter screen by manually turning the handle. However, manual cleaning not only requires shutdown, increasing operation and maintenance costs and labor intensity, but also interrupts the sewage treatment process. Externally powered cleaning structures (such as motor-driven scrapers) require additional power sources, which significantly increases the energy consumption, manufacturing and operating costs of the equipment. Third, even if some filtration mechanisms are equipped with cleaning structures, there are still deficiencies in the collection and discharge of impurities after cleaning. Most systems can only remove impurities from the surface of the filter plate, but the removed impurities are prone to secondary accumulation inside the equipment, requiring additional suction or sewage discharge mechanisms for processing. This makes it impossible to achieve automatic and smooth discharge of impurities, increasing the complexity of the equipment and the difficulty of operation and maintenance.

[0004] Therefore, there is an urgent need to design a wastewater treatment filtration mechanism that is simple in structure, requires no external power, can automatically clean the filter plate, and can efficiently guide impurities out of the wastewater. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a wastewater treatment filtration mechanism that is simple in structure, requires no external power, can automatically clean the filter plate, and can efficiently guide impurities out of the wastewater.

[0006] To achieve the above objectives, this utility model provides a filtration mechanism for wastewater treatment, which is installed inside the tank of a wastewater treatment equipment and used to filter out impurities in wastewater. The tank is equipped with a drain pipe and includes a shell, a filter screen, an impeller, a filter plate, and a cleaning component. An inlet pipe is provided on the outer wall of the shell, extending to the outside of the tank and communicating with an external water supply system. The filter screen is detachably installed inside the inlet pipe. The impeller is located inside the shell and rotates relative to the shell through the wastewater output via the inlet pipe. An outlet is formed at the bottom of the shell, and the impeller is connected to the cleaning component via the outlet. The filter plate is disposed opposite to the outlet, and the cleaning component is used to scrape impurities on the filter plate and guide the impurities to the drain pipe.

[0007] Preferably, the inlet pipe is tapered at one end near the impeller.

[0008] Preferably, the cleaning component includes a rotating shaft and a plurality of first scrapers. The rotating shaft is coaxially arranged with the impeller. Both ends of the rotating shaft pass through the impeller and the filter plate, respectively. One end of the rotating shaft is detachably connected to the impeller. A plurality of first scrapers are arranged circumferentially on the outer wall of the rotating shaft. The plurality of first scrapers are used to scrape impurities on the top surface of the filter plate.

[0009] Preferably, the cleaning assembly includes a plurality of second scrapers, one end of the rotating shaft away from the impeller passes through the filter plate and extends to the underside of the filter plate, and the plurality of second scrapers are spaced apart circumferentially along the rotating shaft and are used to scrape impurities from the bottom surface of the filter plate.

[0010] Preferably, the ends of either the first scraper or the second scraper that are away from the rotating shaft extend to the inner wall of the tank, and each of the first scraper and the second scraper has an inclined groove on the side facing the filter plate, the inclined groove being inclined from the rotating shaft toward the drain pipe.

[0011] Preferably, the housing also includes a top plate, on which the impeller is rotatably mounted. A plurality of grooves are formed on the top surface of the housing along its circumference, and a plurality of protrusions are formed on the sidewall of the top plate to engage with the grooves.

[0012] Preferably, a handle is provided on the top surface of the top plate.

[0013] Preferably, the inlet pipe has a slot for accommodating the filter screen, the slot opening is located on the top surface of the inlet pipe, the top of the filter screen extends out of the slot, and protrusions are provided on both sides of the filter screen.

[0014] Beneficial effects: 1. This utility model discloses a filtration mechanism for wastewater treatment. By utilizing the kinetic energy of wastewater flowing into the tank, the cleaning components are driven to clean impurities on the filter plate. This simplifies the overall structure, eliminates the need for external power drive or power supply modules and control components, and enables automatic cleaning of the filter plate. This significantly reduces maintenance costs and the labor intensity of staff. Furthermore, it allows the wastewater treatment process to be cleaned without interrupting the process, thus improving wastewater treatment efficiency. It is particularly suitable for wastewater treatment scenarios in remote areas or with unstable power supply.

[0015] 2. In the process of using the wastewater treatment filtration mechanism of this utility model, when the cleaning component rotates relative to the housing under the drive of the rotating wheel, the cleaning component can push and scrape off the impurities accumulated on the filter plate, and let the impurities flow naturally into the drain pipe under the guidance of centrifugal force and the cleaning component to be discharged out of the tank. Thus, the impurities are automatically and smoothly discharged without manual intervention or additional suction mechanism, which reduces the complexity of the equipment and the difficulty of operation and maintenance, and improves the cleaning and maintenance efficiency of the filter plate.

[0016] 3. In the wastewater treatment filtration mechanism of this utility model, since the filter screen is detachably installed inside the inlet pipe and the filter screen is located outside the tank, the staff does not need to disassemble the entire filtration mechanism or open the tank. They can simply remove the filter screen directly from the inlet pipe to quickly clean or replace it, which greatly shortens the maintenance time, avoids the interruption of the wastewater treatment process due to filter screen cleaning, and reduces the operation and maintenance costs and the labor intensity of the staff.

[0017] 4. In the wastewater treatment filtration mechanism of this utility model, secondary filtration of wastewater can be achieved through filter screen and filter plate, thereby significantly reducing the impurity content in wastewater, ensuring the filtration effect of wastewater, facilitating other subsequent wastewater treatment processes, and ensuring reliable use. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a top view of the tank body of a wastewater treatment device in the prior art; Figure 2 yes Figure 1 Cross-sectional view at point AA; Figure 3 This is a schematic diagram of the structure of a filtration mechanism for wastewater treatment according to an embodiment of the present invention; Figure 4 This is an exploded view of a wastewater treatment filtration mechanism according to an embodiment of the present invention.

[0020] In the figure: 100 - a filtration mechanism for sewage treatment; 1 - tank; 2 - drain pipe; 3 - shell; 4 - filter screen; 5 - impeller; 6 - filter plate; 7 - inlet pipe; 8 - rotating shaft; 9 - first scraper; 10 - second scraper; 11 - inclined groove; 12 - top plate; 13 - groove; 14 - protrusion; 15 - handle; 16 - slot; 17 - boss. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not imply that the component is required to be absolutely horizontal or suspended, but rather that it may be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] Example 1: This utility model proposes a filtration mechanism 100 for sewage treatment.

[0028] In one embodiment of this utility model, a wastewater treatment filtration mechanism 100 is installed inside the tank 1 of a wastewater treatment equipment and is used to filter out impurities in the wastewater. The tank 1 is provided with a drain pipe 2 and includes a shell 3, a filter screen 4, an impeller 5, a filter plate 6, and a cleaning component. An inlet pipe 7 is provided on the outer wall of the shell 3. The inlet pipe 7 extends to the outside of the tank 1 and is connected to an external water supply system. The filter screen 4 is detachably installed inside the inlet pipe 7. The impeller 5 is installed inside the shell 3 and rotates relative to the shell 3 through the wastewater output by the inlet pipe 7. An outlet is formed at the bottom of the shell 3. The impeller 5 is connected to the cleaning component through the outlet. The filter plate 6 is arranged opposite to the outlet. The cleaning component is used to scrape the impurities on the filter plate 6 and guide the impurities to the drain pipe 2.

[0029] Working principle and process: In the operation of the wastewater treatment filtration mechanism 100 of this utility model, the external water supply system delivers the wastewater to be treated to the inlet pipe 7. The wastewater first flows through the filter screen 4, which intercepts large particles of impurities, completing pretreatment. The pretreated wastewater continues to flow into the shell 3 and impacts the impeller 5, causing it to rotate. At this time, the impeller 5 drives the cleaning component to rotate synchronously. Subsequently, the wastewater flows out from the outlet and falls onto the filter plate 6. The filter plate 6 filters out fine impurities, and the impurities remain on the surface of the filter plate 6, thus completing the secondary filtration of the wastewater. At the same time, the rotating cleaning component pushes and scrapes the impurities remaining on the surface of the filter plate 6 and guides them to the drain pipe 2 to be discharged outside the tank 1, realizing the automatic cleaning and discharge of impurities. Finally, the wastewater after secondary filtration passes through the filter plate 6 and enters the subsequent treatment area (such as the biological treatment layer) of the tank 1.

[0030] Specifically, such as Figures 1 to 4As shown, in the wastewater treatment filtration mechanism 100 of this utility model, the shell 3 can be a hollow cylindrical structure (or a square structure, adapted to the internal space of the tank 1), and the shell 3 can be installed at a preset height position in the inner cavity of the tank 1 by means of a fixed support structure such as a bracket; at the same time, since the inlet pipe 7 is integrally formed on the outer wall of the shell 3, and one end of the inlet pipe 7 extends to the outside of the tank 1 and is connected to the external water supply system (such as the inlet pipe 7 being sealed to the wastewater transfer pump through a flange), it can ensure that the wastewater is stably and leak-free transported into the shell 3, and the structural design is simple and reasonable. Furthermore, since a filter screen 4 is detachably installed inside the inlet pipe 7, the filter screen 4 can be made of corrosion-resistant stainless steel wire (or polyester fiber). Its pore size can be set according to the size of common large particulate impurities in sewage (such as 0.5mm to 1mm), thereby effectively intercepting impurities such as stones and large fibers in the sewage, achieving pre-filtration of sewage before it enters the shell 3. This prevents impurities in the sewage from getting stuck in the impeller 5, causing blockage and affecting rotation, reducing the maintenance frequency of the impeller 5, and thus ensuring the stability and smoothness of the impeller 5's rotation. In addition, when impurities adhere to the surface of the filter screen 4 after long-term use, since the filter screen 4 is located outside the tank 1, the staff does not need to disassemble the entire filtration mechanism or open the tank 1. They can simply remove the filter screen 4 directly from the inlet pipe 7 for quick cleaning or replacement, greatly shortening maintenance time and improving the convenience of filter screen 4 maintenance.

[0031] Understandably, when sewage flows into the housing 3 from the inlet pipe 7, the high-speed flowing sewage directly impacts the blades of the impeller 5 along the conveying direction, causing the impeller 5 to rotate relative to the housing 3 around its own axis. Since the impeller 5 is connected to the cleaning component, it can drive the cleaning component to rotate synchronously relative to the housing 3, thereby scraping impurities on the filter plate 6, thus achieving automatic cleaning of the filter plate 6. Obviously, the sewage treatment filtration mechanism 100 of this utility model uses the kinetic energy of the sewage flowing into the tank 1 to drive the cleaning component and thereby clean impurities on the filter plate 6. This simplifies the overall structure, eliminating the need for external power drive or power supply modules, control components, etc., to achieve automatic cleaning of the filter plate 6, significantly reducing maintenance costs and the labor intensity of personnel. It also allows the sewage treatment process to be cleaned without interrupting the process, improving sewage treatment efficiency, and is particularly suitable for sewage treatment scenarios in remote areas or with unstable power supply. In addition, it should be noted that when sewage flows out of the shell 3, since the filter plate 6 is set opposite to the outlet, the pore size of the filter plate 6 can be selected from 0.1mm to 0.3mm. This allows for further fine filtration of the sewage after pretreatment by the filter screen 4, thereby achieving secondary filtration of the sewage, which significantly reduces the impurity content in the sewage, ensures the filtration effect of the sewage, and facilitates other subsequent sewage treatment processes, making it reliable in use.

[0032] It is worth noting that in the manufacturing process of the wastewater treatment filter mechanism 100 of this utility model, the installation position of the cleaning component is adapted to the position of the sewage pipe 2 on the side wall of the tank 1 (that is, the end of the rotation trajectory of the cleaning component is close to the inlet of the sewage pipe 2). This allows the impurities after being scraped to flow naturally into the sewage pipe 2 and be discharged outside the tank 1 under the guidance of centrifugal force and the cleaning component (the sewage pipe 2 can be externally received and collected by a collection device for centralized collection and treatment of impurities). This achieves automatic and smooth discharge of impurities without manual intervention or additional suction mechanisms, reducing the complexity of the equipment and the difficulty of operation and maintenance.

[0033] In one embodiment, the inlet pipe 7 tapers towards the impeller 5. This embodiment is a structural refinement of Embodiment 1, further refining and optimizing the structure of the inlet pipe 7 based on Embodiment 1. Specifically, as follows... Figures 2 to 4 As shown, the inlet pipe 7 is tapered at the end near the impeller 5. That is, the inner diameter of the inlet pipe 7 gradually decreases along the direction of sewage flow from the end away from the impeller 5 to the end near the impeller 5, forming a conical transition structure where the diameter at the end is smaller than that at the front end (e.g., the inner diameter at the front end of the inlet pipe 7 is 50mm, and the inner diameter at the end near the impeller 5 shrinks to 30mm; the specific shrinkage ratio can be adjusted according to the actual sewage flow requirements). According to the principles of fluid mechanics, with a constant sewage flow rate, the reduction in the pipe diameter will significantly increase the flow velocity of the sewage when it flows through the tapered section. The high-speed flowing sewage can generate a greater impact force on the blades of the impeller 5, thereby driving the impeller 5 to rotate stably at a higher speed. The rotation speed of the cleaning component driven by the impeller 5 also increases accordingly. On the one hand, this can enhance the scraping force of the cleaning component on the surface of the filter plate 6, thereby effectively removing tightly attached impurities and avoiding local blockage caused by impurity residue. On the other hand, the increased rotation frequency of the cleaning component also shortens the residence time of impurities on the surface of the filter plate 6, further reducing the probability of impurity accumulation and adhesion, significantly improving the automatic cleaning efficiency of the filter plate 6, and ensuring reliable use.

[0034] In one embodiment, the cleaning component includes a rotating shaft 8 and a plurality of first scrapers 9. The rotating shaft 8 is coaxially arranged with the impeller 5. Both ends of the rotating shaft 8 pass through the impeller 5 and the filter plate 6, respectively. One end of the rotating shaft 8 is detachably connected to the impeller 5. A plurality of first scrapers 9 are arranged at intervals along its circumference on the outer wall of the rotating shaft 8. The plurality of first scrapers 9 are used to push and scrape impurities on the top surface of the filter plate 6.

[0035] Specifically, such as Figure 3 and Figure 4As shown, since the rotating shaft 8 and impeller 5 in the cleaning assembly are coaxially arranged, it can be ensured that the rotating shaft 8 rotates synchronously with the impeller 5 without eccentricity. This avoids the first scraper 9 from shaking or shifting relative to the filter plate 6 when rotating due to their misalignment, thus affecting the scraping effect on the filter plate 6. At the same time, the two ends of the rotating shaft 8 pass through the impeller 5 and the filter plate 6 respectively, and the impeller 5 and the filter plate 6 form a bidirectional positioning support for the rotating shaft 8, so that the rotating shaft 8 remains stable during rotation, preventing tilting caused by force on one end of the rotating shaft 8, and ensuring the fit between the first scraper 9 and the top surface of the filter plate 6. The structural design is simple and reasonable. Furthermore, one end of the rotating shaft 8 is detachably connected to the impeller 5 (such as a threaded connection or a snap-fit ​​connection). When the cleaning assembly is worn or malfunctions, the staff does not need to disassemble the entire filter mechanism. They only need to open the tank 1 (such as opening the tank cover) to quickly remove the rotating shaft 8 and impeller 5 for repair or replacement, which improves the convenience of maintenance. Furthermore, since several first scrapers 9 (such as 3-4, depending on the diameter of the filter plate 6) are arranged at intervals along the circumference on the outer wall of the rotating shaft 8, the bottom of all the first scrapers 9 are in close contact with the top surface of the filter plate 6. This ensures that when the rotating shaft 8 drives the several first scrapers 9 to rotate, the several first scrapers 9 can fully cover every area of ​​the top surface of the filter plate 6, avoiding cleaning dead corners and ensuring the cleaning effect on the filter plate 6.

[0036] In one embodiment, the cleaning assembly includes a plurality of second scrapers 10, with one end of the rotating shaft 8 away from the impeller 5 passing through the filter plate 6 and extending below the filter plate 6. The plurality of second scrapers 10 are spaced apart circumferentially along the rotating shaft 8 and are used to scrape impurities from the bottom surface of the filter plate 6. Specifically, as Figure 3 and Figure 4 As shown, since the end of the rotating shaft 8 in the cleaning assembly away from the impeller 5 passes through the filter plate 6 and extends to the bottom of the filter plate 6, several second scrapers 10 can be installed on the outer wall of the rotating shaft 8. Furthermore, the tops of the second scrapers 10 are all in contact with the bottom surface of the filter plate 6, so that when the rotating shaft 8 rotates, it can drive the second scrapers 10 to rotate synchronously. This allows them to work in conjunction with the first scrapers 9 to simultaneously clean the bottom and top surfaces of the filter plate 6, thereby thoroughly removing impurities from both sides of the filter plate 6. This not only ensures the unobstructed pores of the filter plate 6 and improves the flow efficiency of wastewater, but also reduces the maintenance frequency of the filter plate 6, ensuring the stable and continuous operation of the wastewater treatment process.

[0037] In one embodiment, the ends of any first scraper 9 and second scraper 10 away from the rotating shaft 8 extend to the inner wall of the tank 1, and each of the first scraper 9 and second scraper 10 has an inclined groove 11 on the side facing the filter plate 6, the inclined groove 11 being inclined from the rotating shaft 8 toward the drain pipe 2. Specifically, as shown... Figure 3 and Figure 4As shown, since the inclined groove 11 is inclined from the rotating shaft 8 toward the drain pipe 2, that is, the end of the inclined groove 11 near the rotating shaft 8 is the high point and the end near the inner wall of the tank 1 is the low point (the inclination angle can be set to 15° to 30°), when the first scraper 9 and the second scraper 10 push and scrape the impurities, the impurities can be gathered by the inclined groove 11 and guided along the inclined surface to the drain pipe 2 on the inner wall of the tank 1. At the same time, with the action of centrifugal force, the impurities flow smoothly into the drain pipe 2, thereby realizing the automatic discharge of impurities and avoiding the impurities pushed off from the filter plate 6 to re-accumulate and affect the filtration effect.

[0038] In one embodiment, a top plate 12 is also included, on which the impeller 5 is rotatably mounted. A plurality of grooves 13 are formed circumferentially on the top surface of the housing 3, and a plurality of protrusions 14 are formed on the sidewall of the top plate 12 to engage with the grooves 13. It can be understood that, as Figure 3 and Figure 4 As shown, since the impeller 5 is rotatably mounted on the top plate 12, the top plate 12 can be quickly installed and limited through the interlocking of several protrusions 14 and grooves 13, effectively preventing the impeller 5 from causing synchronous displacement or rotation of the top plate 12 during rotation. Furthermore, when cleaning and maintenance of the impeller 5 is required, the operator can open the tank cover of the tank body 1 and directly remove the top plate 12 to remove the impeller 5 from the shell 3. The operation is simple and convenient, significantly improving the maintenance efficiency of the impeller 5. In addition, it should be noted that in the actual manufacturing process of the wastewater treatment filter mechanism 100 of this utility model, although the installation and positioning of the top plate 12 can be limited by the insertion and cooperation of several protrusions 14 and grooves 13, it is preferable that the several protrusions 14 and grooves 13 can also be reinforced by a pin-shaping connection. That is, elastic pins are set on several protrusions 14, and limiting holes for the elastic pins to extend into are opened on the side walls of several grooves 13. The insertion and cooperation of the elastic pins and the limiting holes can further improve the installation stability of the top plate 12 on the housing 3, ensuring that the impeller 5 can rotate smoothly under the impact of wastewater. The structural design is simple and reasonable.

[0039] In one embodiment, specifically, as Figure 3 and Figure 4 As shown, a handle 15 is provided on the top surface of the top plate 12, which makes it easy for workers to lift the top plate 12 to separate the impeller 5 and the housing 3, which facilitates operation and improves the convenience of maintenance of the impeller 5.

[0040] In one embodiment, a slot 16 for accommodating a filter screen 4 is provided inside the liquid inlet pipe 7. The opening of the slot 16 is located on the top surface of the liquid inlet pipe 7, the top of the filter screen 4 extends out of the slot 16, and protrusions 17 are respectively provided on both sides of the filter screen 4. Specifically, as shown... Figures 2 to 4As shown, since a groove 16 is provided inside the inlet pipe 7, the groove 16 extends radially along the inlet pipe 7 and the groove opening is located on the top surface of the inlet pipe 7. This allows the filter screen 4 to be inserted or pulled out from the groove opening along the extension direction of the groove 16, and prevents sewage from leaking from the groove opening. At the same time, protrusions 17 are integrally formed on both sides of the filter screen 4. When the filter screen 4 is fully inserted into the groove 16, the protrusions 17 will lock into the edge of the groove opening of the groove 16, thereby preventing the filter screen 4 from falling completely into the interior of the inlet pipe 7 and being difficult to remove. The structural design is simple and reasonable. It should be noted that in the actual manufacturing process of the sewage treatment filter mechanism 100 of this utility model, the filter screen 4 can be threadedly connected to the inlet pipe 7 through a threaded locking part, thereby improving the installation stability of the filter screen 4. In addition, an elastic sealing ring is provided between the filter screen 4 and the liquid inlet pipe 7. The elastic sealing ring can prevent sewage from leaking from the gap between the filter screen 4 and the liquid inlet pipe 7. The elastic sealing ring and its installation method are mature existing technologies, and will not be described in detail here.

[0041] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A filter mechanism for sewage treatment, which is provided in a tank (1) of a sewage treatment device and is used to filter out impurities in sewage, wherein a sewage discharge pipe (2) is provided on the tank (1), characterized in that, The system includes a housing (3), a filter screen (4), an impeller (5), a filter plate (6), and a cleaning component. An inlet pipe (7) is provided on the outer wall of the housing (3). The inlet pipe (7) extends to the outside of the tank (1) and is connected to an external water supply system. The filter screen (4) is detachably installed inside the inlet pipe (7). The impeller (5) is located inside the housing (3) and rotates relative to the housing (3) through the sewage output by the inlet pipe (7). An outlet is formed at the bottom of the housing (3). The impeller (5) is connected to the cleaning component through the outlet. The filter plate (6) is arranged opposite to the outlet. The cleaning component is used to scrape impurities on the filter plate (6) and guide the impurities to the drain pipe (2).

2. The filtering mechanism for sewage treatment according to claim 1, characterized in that, The inlet pipe (7) is tapered at one end near the impeller (5).

3. The filtering mechanism for sewage treatment according to claim 2, characterized in that, The cleaning assembly includes a rotating shaft (8) and a plurality of first scrapers (9). The rotating shaft (8) is coaxially arranged with the impeller (5). Both ends of the rotating shaft (8) pass through the impeller (5) and the filter plate (6) respectively. One end of the rotating shaft (8) is detachably connected to the impeller (5). A plurality of first scrapers (9) are arranged at intervals along its circumference on the outer wall of the rotating shaft (8). The plurality of first scrapers (9) are used to scrape the impurities on the top surface of the filter plate (6).

4. A filtration mechanism for wastewater treatment according to claim 3, characterized in that, The cleaning assembly includes a plurality of second scrapers (10), one end of the rotating shaft (8) away from the impeller (5) passes through the filter plate (6) and extends to the bottom of the filter plate (6), and the plurality of second scrapers (10) are arranged circumferentially at intervals along the rotating shaft (8) and are used to scrape impurities from the bottom surface of the filter plate (6).

5. The filtering mechanism for sewage treatment according to claim 4, characterized in that, The end of each of the first scraper (9) and the second scraper (10) away from the rotating shaft (8) extends to the inner wall of the tank (1), and each of the first scraper (9) and the second scraper (10) facing the filter plate (6) is provided with a sloping groove (11), which is inclined from the rotating shaft (8) toward the drain pipe (2).

6. The filtering mechanism for sewage treatment according to any one of claims 1-5, characterized in that, It also includes a top plate (12), the impeller (5) is rotatably mounted on the top plate (12), and a plurality of grooves (13) are provided on the top surface of the housing (3) along its circumference. A plurality of protrusions (14) are formed on the side wall of the top plate (12) to engage with the plurality of grooves (13).

7. The filtering mechanism for sewage treatment according to claim 6, characterized in that, A handle (15) is provided on the top surface of the top plate (12).

8. The filtering mechanism for sewage treatment as claimed in any one of the claims 1-5, wherein, The inlet pipe (7) is provided with a slot (16) for accommodating the filter screen (4). The slot (16) is located on the top surface of the inlet pipe (7). The top of the filter screen (4) extends out of the slot (16), and protrusions (17) are provided on both sides of the filter screen (4).

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