A wastewater treatment device for building drainage

Abstract

This invention belongs to the field of wastewater treatment technology, and particularly relates to a wastewater treatment device for building drainage, comprising a shell with an inlet pipe and an outlet pipe, and a filter screen, which is cylindrical and fixedly installed inside the shell. This invention utilizes a cleaning mechanism combining a brush and a scraper. The brush bristles, under the constant pressure of a compression spring, remain tightly against the inner wall of the filter screen, and, with the cooperation of a sleeve, a limiting roller, and an arc groove, perform a combined circular rotation and reciprocating motion, achieving thorough cleaning of the filter screen's inner wall without dead angles, removing fine impurities. The scraper cleans large, viscous impurities that the brush bristles cannot handle. The alternating arrangement of the two creates a synergistic cleaning effect. Simultaneously, the gap between the scraper and the filter screen creates a shearing flow field, cutting impurities into small pieces, thus preventing filter screen clogging, ensuring filtration efficiency, and preventing large impurities from clogging the discharge outlet.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and in particular relates to a wastewater treatment device for building drainage. Background Technology

[0002] Building drainage includes various types such as domestic sewage and washing wastewater. Sewage contains solid impurities such as hair, food scraps, and silt. Direct discharge can easily cause blockage of municipal pipe networks. Therefore, sewage treatment and filtration devices at the building drainage end have become a key component of the drainage system. Sewage treatment devices for building drainage are usually in the form of an integrated or modular structure, integrating physical, biological, and chemical treatment units. Through collaborative work, they remove pollutants such as suspended solids, organic matter, nitrogen and phosphorus, and pathogenic microorganisms from sewage. The effluent meets the corresponding standards for discharge into urban sewers, environmental water bodies, or building wastewater reuse, and completes the compliant disposal of sludge and odor.

[0003] A search revealed that patent document CN213327051U discloses a sewage treatment device for building drainage pipes. Addressing the issue that most existing sewage treatment devices require manual addition of purifying agents, resulting in cumbersome operation for workers, this invention proposes the following solution: It includes a treatment tank with a rotating shaft mounted inside. First bevel gears are rotatably mounted on both the inner and outer sides of the tank, with two bevel gears on the same side meshing. A stirring rod is rotatably mounted inside the tank, with multiple stirring blades fixedly mounted on its outer side. Two stirring blades on the inner side of the tank are fixedly mounted on the top of the stirring rod and the outer side of the rotating shaft, respectively. Both ends of the rotating shaft extend to the outer side of the treatment tank. This invention improves the efficiency of sewage treatment. By using a plug, the plug can be opened, allowing manual cleaning of the filter screen surface, thus enabling the filter screen to be reused.

[0004] Although the above-mentioned device allows the filter to be reused, the manual cleaning method requires disassembling the device's components, which will inevitably affect the normal operation of the device and reduce its working efficiency. In addition, manual cleaning is difficult to achieve thorough cleaning, and the cleaning effect is poor for both large, sticky impurities and small impurities. Summary of the Invention

[0005] The purpose of this invention is to address the problems mentioned in the background section by providing a wastewater treatment device for building drainage.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions:

[0007] A wastewater treatment device for building drainage includes a housing, on which an inlet pipe and an outlet pipe are provided.

[0008] It also includes a filter screen, which is cylindrical and fixedly disposed inside the housing.

[0009] The cleaning mechanism includes a rotating shaft tube rotatably disposed inside the filter screen, a sleeve slidably disposed outside the rotating shaft tube, bristles for removing impurities from the surface of the filter screen provided outside the sleeve, and blades for assisting its rotation outside the rotating shaft tube.

[0010] When water flows into the internal cavity from the inlet pipe, the water impacts the blades and drives the rotating shaft to rotate.

[0011] Preferably, the filter screen has tapered mesh openings, with the larger end of the tapered mesh opening facing the inner cavity and the smaller end facing the outer cavity. A sludge collection trough is provided at the bottom of the housing, located below the filter screen, and the opening of the sludge collection trough communicates with the inner cavity. A drain outlet is provided at the bottom of the sludge collection trough, and a sealing cap is detachably provided on the drain outlet.

[0012] Preferably, the outer surface of the sleeve is provided with an arc-shaped groove, and a limiting roller is provided in the outer cavity. One end of the limiting roller is located in the arc-shaped groove. When the sleeve rotates with the rotating shaft tube, it will drive the bristles to move up and down along the rotating shaft tube.

[0013] Preferably, the lower end of the filter screen is lower than the plane of the brush bristles, and the direction of the brush bristles' rotation is towards the opening of the dirt collection tank, so as to sweep impurities into the dirt collection tank.

[0014] Preferably, a collector pipe is provided above the blade, and the inner wall of the collector pipe has an inclined surface. The collector pipe and the inclined surface can gather the water flow and then impact the blade to make it rotate.

[0015] Preferably, a scraper is also fixedly provided on the rotating shaft tube. The scraper extends along the axial direction of the rotating shaft tube, and the radial length of the scraper is greater than the radial length of the bristles. A gap is left between the outer surface of the scraper and the inner wall of the filter screen. The scraper and the bristles are alternately arranged on the outer surface of the rotating shaft tube.

[0016] Preferably, the brush bristles include a rigid brush handle fixedly connected to the scraper and flexible brush filaments slidably connected to the rigid brush handle. A compression spring is provided inside the rigid brush handle. One end of the compression spring abuts against the bottom of the rigid brush handle, and the other end abuts against the top of the flexible brush filaments, for pressing the end of the flexible brush filaments against the inner wall of the filter screen with constant pressure.

[0017] Preferably, bushings are provided at the connection points between the two ends of the rotating shaft tube and the housing, the inner wall of the bushing is provided with a rotating bearing, a retaining ring is embedded in the inner wall of the bushing, the inner wall of the rotating bearing is interference-fitted with the outer circumferential surface of the rotating shaft tube, and the retaining ring is located inside the bushing to prevent hair and other impurities from getting entangled in the rotating bearing.

[0018] Preferably, the rotating shaft tube includes a spray hole on the outer surface and a flow groove on the inner wall. The spray hole is located above the gap between the retaining ring and the rotating shaft tube. Two one-way sealing tubes are slidably connected inside the rotating shaft tube. Flow holes are provided on the outer surfaces of the two one-way sealing tubes. An elastic element is provided on the bottom wall of the rotating shaft tube. The two one-way sealing tubes are fixedly connected, and the telescopic end of the elastic element is fixedly connected to the lowest one-way sealing tube.

[0019] Preferably, the rotating shaft tube is connected to an external liquid pumping device. When the liquid pumping device pumps clean water into the rotating shaft tube, it will push the one-way sealing tube downward to make the flow hole and the spray hole coincide. The clean water is sprayed downward through the spray hole to clean the impurities accumulated in the retaining ring.

[0020] Compared with existing technologies, the advantages of this wastewater treatment device for building drainage are:

[0021] 1. This invention features a cleaning mechanism that employs a composite cleaning structure of brush bristles and scrapers. The brush bristles, under the constant pressure of a compression spring, remain tightly attached to the inner wall of the filter screen. With the cooperation of a sleeve, a limiting roller, and an arc groove, they complete a composite motion of circumferential rotation and reciprocating motion, achieving thorough cleaning of the inner wall of the filter screen without dead angles and removing fine impurities. The scraper can clean large, sticky impurities that are difficult for the brush bristles to handle. The alternating arrangement of the two mechanisms creates a synergistic cleaning effect. At the same time, the gap between the scraper and the filter screen creates a shearing flow field, cutting impurities into small pieces. This not only prevents the filter screen from clogging and ensures that the filtration efficiency does not decrease, but also prevents large impurities from clogging the drain outlet.

[0022] 2. This invention features a rotating shaft tube with a combined structure of a spray hole, a one-way sealing tube, and an elastic element. When impurities accumulate in the gap between the retaining ring and the rotating shaft tube, an external liquid pumping device pumps clean water, which pushes the one-way sealing tube downward, causing the flow hole to coincide with the spray hole. The high-pressure spray of clean water washes the impurities down into the collection tank, achieving localized impurity cleaning. After pumping stops, the elastic element drives the one-way sealing tube to automatically reset, causing the flow hole and spray hole to be misaligned, thus sealing the spray hole and preventing sewage backflow during wastewater treatment, ensuring the airtightness of the device during operation.

[0023] 3. The present invention uses a conical mesh filter with the larger end facing the inner cavity and the smaller end facing the outer cavity. This not only achieves efficient solid-liquid separation, but also effectively prevents solid impurities from adhering to the inner wall of the filter, avoiding impurities from falling off and flowing back. Structurally, this improves the stability of building drainage filtration, increases the cleanliness of the effluent, and reduces the risk of subsequent pipe network blockage.

[0024] 4. This invention features a sludge collection tank at the bottom of the housing that communicates with the internal cavity. The lower end of the filter screen is below the plane of the brush bristles' rotation, and the rotation direction of the brush bristles and scraper faces the opening of the sludge collection tank. The cleaned impurities fall precisely into the sludge collection tank under the directional pushing action of gravity and the scraper, achieving centralized storage. Subsequently, only the sealing cover of the drain port needs to be removed to quickly discharge the impurities. There is no need to disassemble the core components of the device, which greatly reduces the cumbersomeness of maintenance operations and shortens maintenance time. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a wastewater treatment device for building drainage provided by the present invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of a wastewater treatment device for building drainage provided by the present invention;

[0027] Figure 3 This is a partial internal structure diagram of a wastewater treatment device for building drainage provided by the present invention;

[0028] Figure 4 This is a schematic diagram of the cleaning mechanism location structure of a sewage treatment device for building drainage provided by the present invention;

[0029] Figure 5 This is a schematic diagram of the cleaning mechanism of a sewage treatment device for building drainage provided by the present invention.

[0030] Figure 6 This invention provides Figure 5 Enlarged schematic diagram of the structure at point A in the diagram;

[0031] Figure 7 This is a schematic diagram of the brush structure of a sewage treatment device for building drainage provided by the present invention;

[0032] Figure 8 This is a schematic diagram of the internal structure of the bushing of a sewage treatment device for building drainage provided by the present invention;

[0033] Figure 9 This is a schematic diagram of the internal structure of the rotating shaft pipe of a sewage treatment device for building drainage provided by the present invention.

[0034] In the diagram: 1. Shell; 2. Inlet pipe; 3. Outlet pipe; 4. Filter screen; 5. Internal cavity; 6. External cavity; 7. Cleaning mechanism; 8. Sludge collection tank; 9. Drain outlet; 10. Sealing cover; 71. Rotary shaft tube; 72. Blade; 73. Brush bristles; 74. Scraper; 75. Bushing; 76. Sleeve; 77. Arc groove; 711. Spray hole; 712. Flow groove; 713. One-way sealing tube; 714. Flow hole; 715. Elastic element; 721. Collector pipe; 722. Inclined surface; 732. Rigid brush handle; 733. Flexible brush bristles; 734. Compression spring; 751. Rotating bearing; 752. Retaining ring. Detailed Implementation

[0035] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0036] Example: Refer to Figures 1 to 9 A wastewater treatment device for building drainage includes a housing 1, on which an inlet pipe 2 and an outlet pipe 3 are provided.

[0037] It also includes a filter screen 4, which is cylindrical and fixedly installed inside the housing 1. The housing 1 is divided into an inner cavity 5 located inside the filter screen 4 and an outer cavity 6 located outside the filter screen 4. The water inlet pipe 2 is connected to the inner cavity 5 and the water outlet pipe 3 is connected to the outer cavity 6.

[0038] The cleaning mechanism 7 includes a rotating shaft tube 71 rotatably disposed inside the filter screen 4, a sleeve 76 slidably disposed outside the rotating shaft tube 71, bristles 73 for removing impurities from the surface of the filter screen 4 provided outside the sleeve 76, and blades 72 for assisting its rotation outside the rotating shaft tube 71.

[0039] When water flows into the internal cavity 5 from the inlet pipe 2, the water impacts the blades 72 and drives the rotating shaft tube 71 to rotate.

[0040] The outer surface of the sleeve 76 is provided with an arc-shaped groove 77, and a limiting roller is provided in the outer cavity 6. One end of the limiting roller is located in the arc-shaped groove 77. When the sleeve 76 rotates with the rotating shaft tube 71, it will drive the bristles 73 to move up and down along the rotating shaft tube 71.

[0041] It should be noted that the wastewater treated by this device will be discharged into the biological treatment tank through the effluent pipe 3. The organic matter will be decomposed by microorganisms, and nitrogen and phosphorus will be removed. Then the wastewater will be exposed to sedimentation, followed by chemical coagulation and sedimentation, and then filtered and disinfected again before being discharged.

[0042] To further explain, such as Figure 2 and Figure 3As shown, the mesh of the filter screen 4 is conical, with the larger end of the conical mesh facing the inner cavity 5 and the smaller end facing the outer cavity 6. Solid-liquid separation is achieved by relying on the conical mesh of the filter screen 4 with the larger end facing inward and the smaller end facing outward, thereby achieving the purpose of filtering sewage. A sludge collection tank 8 is provided at the bottom of the shell 1. The sludge collection tank 8 is located below the filter screen 4, and the opening of the sludge collection tank 8 is connected to the inner cavity 5. A sewage discharge port 9 is provided at the bottom of the sludge collection tank 8, and a sealing cover 10 is detachably provided on the sewage discharge port 9.

[0043] Specifically, building drainage enters the internal cavity 5 formed by the cylindrical filter screen 4 through the inlet pipe 2 of the shell 1. The sewage filtered by the filter screen 4 enters the external cavity 6 and is finally discharged through the outlet pipe 3. The conical mesh structure can effectively block solid impurities from adhering to the inner wall of the filter screen 4, preventing impurities from falling off and flowing back, thus improving the stability and cleanliness of filtration. Moreover, the slipping impurities will fall precisely into the sludge collection tank 8 connected to the internal cavity 5, realizing the centralized storage of solid impurities. Subsequently, it is only necessary to remove the sealing cover 10 on the drain outlet 9 at the bottom of the sludge collection tank 8 to quickly discharge the impurities in the tank.

[0044] To elaborate further, such as Figure 4 and Figure 5 As shown, the lower end of the filter screen 4 is lower than the rotating plane of the bristles 73, and the rotating direction of the bristles 73 is towards the opening of the dirt collection tank 8, which is used to sweep impurities into the dirt collection tank 8.

[0045] It should be noted that the scraper 74, which is alternately arranged with the bristles 73 on the rotating shaft tube 71, rotates synchronously with the rotating shaft tube 71. Its radial length is greater than that of the bristles 73, which can efficiently remove large pieces and sticky impurities that are difficult to clean by the bristles 73. The lower end of the filter screen 4 is lower than the rotating plane of the bristles 73. Under the action of its own gravity and the directional pushing action of the scraper 74, the various impurities cleaned off fall precisely into the dirt collection tank 8, which is connected to the internal cavity 5, for centralized storage.

[0046] To further explain, such as Figure 4 As shown, a collector pipe 721 is provided above the blade 72. An inclined surface 722 is provided on the inner wall of the collector pipe 721. The circumference of the blade 72 is greater than the circumference of the collector pipe 721. When the water flows from the collector pipe to the inner cavity 5, the water will impact the inclined surface of the blade 72 to the maximum extent, thereby driving the blade 72 to rotate. The collector pipe 721 and the inclined surface 722 can gather the water flow and then impact the blade 72 to make it rotate.

[0047] During the water intake process, the water flow first converges through the collection pipe 721 and the inclined surface 722 and then precisely impacts the blades 72, thereby driving the rotating shaft tube 71 inside the filter screen 4 to rotate. The cleaning mechanism 7 is driven by the power of the water flow itself, saving additional power consumption and achieving energy-saving operation.

[0048] To elaborate further, such as Figure 4 and Figure 5As shown, a scraper 74 is also fixedly installed on the rotating shaft tube 71. The scraper 74 extends along the axial direction of the rotating shaft tube 71, and the radial length of the scraper 74 is greater than the radial length of the bristles 73. A gap is left between the outer surface of the scraper 74 and the inner wall of the filter screen 4. The gap between the scraper 74 and the filter screen 4 forms a shear flow field, which can cut the stripped impurities into small pieces, making it easier to discharge them through the drain port 9 in the future, and preventing large impurities from clogging the drain port 9. The scraper 74 and the bristles 73 are alternately arranged on the outer surface of the rotating shaft tube 71.

[0049] To further explain, such as Figure 7 As shown, the bristles 73 include a rigid brush handle 732 fixedly connected to the scraper 74 and flexible bristles 733 slidably connected to the rigid brush handle 732. A compression spring 734 is provided inside the rigid brush handle 732. One end of the compression spring 734 abuts against the bottom of the rigid brush handle 732 and the other end abuts against the top of the flexible bristles 733. It is used to press the end of the flexible bristles 733 against the inner wall of the filter screen 4 with constant pressure. The bristles 73 are always tightly attached to the inner wall of the filter screen 4 by the constant pressure of the compression spring 734 inside the rigid brush handle 732.

[0050] It should be noted that when the rotating shaft tube 71 rotates, it drives the outer sleeve 76 to rotate synchronously. The sleeve 76 is restricted by the trajectory of the limiting roller and the arc groove 77 in the outer cavity 6, which drives the bristles 73 to move up and down along the rotating shaft tube 71 to perform all-round brushing. Even if the filter screen 4 is slightly worn or the bristles 73 are damaged, the cleanliness and fit can still be guaranteed, allowing the fine impurities on the inner wall of the filter screen 4 to be fully removed.

[0051] To elaborate further, such as Figure 8 As shown, bushings 75 are respectively provided at the connection between the two ends of the rotating shaft tube 71 and the housing 1. The inner wall of the bushing 75 is provided with a rotating bearing 751. A retaining ring 752 is embedded in the inner wall of the bushing 75. The inner wall of the rotating bearing 751 is interference-fitted with the outer circumferential surface of the rotating shaft tube 71. The retaining ring 752 is located inside the bushing 75 to prevent hair and other impurities from getting entangled in the rotating bearing 751. Although it can ensure that impurities will not get entangled in the rotating bearing 75 and the rotating shaft tube 71, thin and long impurities such as hair will still get entangled in the gap between the rotating shaft tube 71 and the retaining ring 752.

[0052] Specifically, the bushings 75 at both ends of the rotating shaft tube 71 and the housing 1 have built-in rotating bearings 751, which can effectively reduce the frictional resistance when the rotating shaft tube 71 rotates and ensure the smoothness of rotation. The retaining rings 752 embedded in the inner wall of the bushings 75 can physically block hair and fibrous impurities, preventing impurities from getting tangled in the rotating bearings 751 and causing jamming, thus ensuring the long-term stable operation of the cleaning mechanism 7.

[0053] To further explain, such as Figure 9As shown, the rotating shaft tube 71 includes a spray hole 711 on the outer surface and a flow groove 712 on the inner wall. The spray hole 711 is located above the gap between the retaining ring 752 and the rotating shaft tube 71. Two one-way sealing tubes 713 are slidably connected inside the rotating shaft tube 71. Flow holes 714 are provided on the outer surface of both one-way sealing tubes 713. An elastic element 715 is provided on the bottom wall of the rotating shaft tube 71. The two one-way sealing tubes 713 are fixedly connected, and the telescopic end of the elastic element 715 is fixedly connected to the lowest one-way sealing tube 713.

[0054] To elaborate further, such as Figure 8 and Figure 9 As shown, the rotating shaft tube 71 is connected to an external liquid pumping device. When the liquid pumping device pumps clean water into the rotating shaft tube 71, it will push the one-way sealing tube 713 downward to make the flow hole 714 and the spray hole 711 coincide. The clean water is sprayed downward through the spray hole 711 to clean the impurities accumulated in the retaining ring 752.

[0055] It should be noted that when impurities accumulate inside the retaining ring 752, the rotating shaft tube 71 is connected to an external liquid pumping device. The pumped clean water will push the one-way sealing tube 713 inside the rotating shaft tube 71 downward, causing the flow hole 714 to coincide with the spray hole 711. The clean water is sprayed downward at high pressure through the spray hole 711, quickly flushing the impurities accumulated inside the retaining ring 752 into the sludge collection tank 8, achieving thorough cleaning of local impurities. After pumping stops, the elastic element 715 on the bottom wall of the rotating shaft tube 71 drives the one-way sealing tube 713 to automatically reset, causing the flow hole 714 to be misaligned with the spray hole 711, thus sealing the spray hole 711 and preventing sewage backflow during the sewage treatment process.

[0056] The functional principle of this invention can be explained through the following operation: Building wastewater enters the internal cavity 5 formed by the cylindrical filter screen 4 through the inlet pipe 2 of the shell 1. Highly efficient solid-liquid separation is achieved through the conical mesh structure of the filter screen 4, where the larger opening faces the internal cavity 5 and the smaller opening faces the external cavity 6. The filtered wastewater can smoothly pass through the mesh of the filter screen 4 into the external cavity 6 and is finally discharged through the outlet pipe 3. This conical mesh design effectively prevents solid impurities in the wastewater from adhering to the inner wall of the filter screen 4, while also preventing impurities from falling off the mesh and flowing back, thus structurally improving drainage. The stability of filtration and the cleanliness of the effluent are achieved by the fact that during the water inlet process, the water flow does not directly diffuse into the internal cavity 5, but first flows through the collection pipe 721 above the blades 72. Under the guidance of the inclined surface 722 on the inner wall of the collection pipe 721, the water flow is gathered. The gathered water flow accurately impacts the blades 72 outside the rotating shaft pipe 71. With the help of the water flow power of the building drainage itself, the rotating shaft pipe 71 inside the filter screen 4 is directly driven to rotate around its own axis. No external power equipment is required throughout the process, realizing the energy-free drive of the cleaning mechanism 7 and reducing the operating cost of the device.

[0057] When the rotating shaft tube 71 rotates, the sleeve 76, which is slidably fitted to its outside, moves synchronously in a circular motion with the rotating shaft tube 71. The movement trajectory of the sleeve 76 is simultaneously restricted by the limiting roller and the arc-shaped groove 77 within the outer cavity 6. One end of the limiting roller is embedded in the arc-shaped groove 77. As the sleeve 76 rotates in a circular motion, it drives the sleeve 76 to reciprocate up and down along the axial direction of the rotating shaft tube 71. This, in turn, drives the bristles 73 on the outside of the sleeve 76 to simultaneously complete a combined motion of circular rotation and up-and-down movement. The bristles 73 consist of a rigid brush handle 732, flexible bristles 733, and... Compression spring 734 is used to provide a continuous outward pushing force to flexible bristles 733 through its own elastic tension, so that the ends of flexible bristles 733 are always in close contact with the inner wall of filter screen 4. Even if filter screen 4 is slightly worn after long-term use, or flexible bristles 733 are slightly worn, the bristles 73 can still maintain the fit between the bristles 73 and the inner wall of filter screen 4, so as to achieve all-round brushing of the inner wall of filter screen 4 without dead corners, fully remove the fine solid impurities attached to the mesh, prevent mesh clogging, and ensure that the filtration efficiency does not decrease.

[0058] The scraper 74, alternately arranged with the bristles 73 on the outer surface of the rotating shaft tube 71, performs synchronous circular motion as the rotating shaft tube 71 rotates. The scraper 74 extends axially along the rotating shaft tube 71, and its radial length is greater than that of the bristles 73. A small gap is maintained between the outer surface and the inner wall of the filter screen 4, which prevents scratching the inner wall of the filter screen 4 and accurately removes large, sticky impurities that are difficult for the bristles 73 to clean. This creates a synergistic cleaning effect where the bristles clean fine impurities and the scraper cleans coarse impurities. The lower end of the filter screen 4 is designed to be lower than the plane of rotation of the bristles 73. 73 and scraper 74 clean up various impurities that have fallen off. Under their own gravity, they slide downwards. At the same time, the rotation direction of scraper 74 is towards the opening of the dirt collection tank 8 at the bottom of the housing 1. During the rotation, it forms a directional pushing force on the impurities, allowing the sliding impurities to fall accurately into the dirt collection tank 8 which is connected to the internal cavity 5, thus achieving centralized storage of solid impurities. Subsequently, it is only necessary to remove the sealing cover 10 on the drain port 9 at the bottom of the dirt collection tank 8 to quickly discharge the impurities in the tank. The entire maintenance process does not require disassembling the core components of the device, making the operation convenient and time-saving.

[0059] To ensure the long-term stable rotation of the rotating shaft tube 71, bushings 75 are provided at the connection points between the upper and lower ends of the rotating shaft tube 71 and the housing 1. The inner wall of the rotating bearing 751 embedded inside the bushing 75 is interference-fitted with the outer circumferential surface of the rotating shaft tube 71, which transforms the sliding friction between the rotating shaft tube 71 and the housing 1 into rolling friction inside the rotating bearing 751. This significantly reduces the frictional resistance when the rotating shaft tube 71 rotates, ensuring the smoothness of the rotation of the rotating shaft tube 71 and reducing component wear. The inner wall of the bushing 75 is also fitted with a retaining ring 752, which surrounds the outside of the rotating shaft tube 71. It can physically block hair, fibers and other filamentous impurities in the sewage, preventing such impurities from getting tangled in the rotating bearing 751 and causing bearing jamming. This reduces the failure of the cleaning mechanism 7 due to component entanglement and ensures the long-term continuous operation of the device.

[0060] When impurities accumulate in the gap between the retaining ring 752 and the rotating shaft tube 71, an external liquid pumping device will pump clean water into the rotating shaft tube 71. The water pressure generated inside the rotating shaft tube 71 will push the two one-way sealing tubes 713, which are fixedly connected, downward. During the synchronous downward movement, the flow holes 714 on the outer surface of the one-way sealing tubes 713 will precisely align with the spray holes 711 on the outer surface of the rotating shaft tube 71. At this time, the clean water inside the rotating shaft tube 71 will enter the spray holes 711 through the flow holes 714 and be sprayed downward at high pressure from the spray holes 711, directly flushing away the impurities accumulated inside the retaining ring 752 and quickly washing them off. In the lower sludge collection tank 8, local impurities are cleaned to ensure that impurities do not get tangled in the gap between the rotating shaft tube 71 and the retaining ring 752. The bottom wall of the rotating shaft tube 71 is provided with an elastic element 715, the telescopic end of which is fixedly connected to the lowest flow hole 714. When the pumping of clean water stops, the water pressure in the rotating shaft tube 71 disappears. The elastic element 715 uses its own elastic restoring force to drive the two one-way sealing tubes 713 to return to their original position, so that the flow hole 714 and the spray hole 711 are staggered, thereby sealing the spray hole 711 and preventing the sewage in the internal cavity 5 from flowing back into the rotating shaft tube 71 through the spray hole 711 during normal sewage treatment, thus ensuring the sealing of the device operation.

[0061] The device integrates multiple mechanical components, from component protection to localized cleaning, to achieve filtration, self-cleaning, impurity collection, and localized anti-tangling cleaning using the building's own drainage water flow. This solves the problems of traditional filters being prone to clogging, difficult to clean impurities, and components being prone to tangling.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wastewater treatment device for building drainage, comprising a housing (1), wherein an inlet pipe (2) and an outlet pipe (3) are provided on the housing (1), characterized in that: It also includes a filter screen (4), which is cylindrical and fixedly disposed inside the housing (1); The cleaning mechanism (7) includes a rotating shaft tube (71) rotatably disposed inside the filter screen (4), a sleeve (76) slidably disposed outside the rotating shaft tube (71), bristles (73) for removing impurities from the surface of the filter screen (4) are provided outside the sleeve (76), and blades (72) for assisting its rotation are also provided outside the rotating shaft tube (71). When water flows into the filter screen (4) from the inlet pipe (2), the water flow impacts the blades (72) and drives the rotating shaft tube (71) to rotate.

2. The sewage treatment device for building drainage according to claim 1, characterized by The mesh of the filter screen (4) is conical, with the larger end of the conical mesh facing the inner cavity (5) and the smaller end facing the outer cavity (6). A dirt collection tank (8) is provided at the bottom of the housing (1). The dirt collection tank (8) is located below the filter screen (4), and the opening of the dirt collection tank (8) is connected to the inner cavity (5). A drain port (9) is provided at the bottom of the dirt collection tank (8), and a sealing cap (10) is detachably provided on the drain port (9).

3. The sewage treatment device for building drainage according to claim 1, characterized by The bottom of the housing (1) is provided with a dirt collection tank (8), which is located below the filter screen (4). The opening of the dirt collection tank (8) is connected to the internal cavity (5). The bottom of the dirt collection tank (8) is provided with a drain port (9), and a sealing cover (10) is detachably provided on the drain port (9).

4. The sewage treatment device for building drainage according to claim 1, characterized by The lower end of the filter screen (4) is lower than the rotating plane of the bristles (73), and the rotating direction of the bristles (73) is toward the opening of the dirt collection tank (8), which is used to sweep impurities into the dirt collection tank (8).

5. The sewage treatment device for building drainage according to claim 1, wherein A collector pipe (721) is provided above the blade (72), and an inclined surface (722) is provided on the inner wall of the collector pipe (721). The collector pipe (721) and the inclined surface (722) can gather the water flow and then impact the blade (72) to make it rotate.

6. A wastewater treatment device for building drainage according to claim 1, characterized in that, A scraper (74) is also fixedly installed on the rotating shaft tube (71). The scraper (74) extends along the axial direction of the rotating shaft tube (71), and the radial length of the scraper (74) is greater than the radial length of the bristles (73). There is a gap between the outer surface of the scraper (74) and the inner wall of the filter screen (4). The scraper (74) and the bristles (73) are alternately arranged on the outer surface of the rotating shaft tube (71).

7. A wastewater treatment device for building drainage according to claim 6, characterized in that, The bristles (73) include a rigid brush handle (732) fixedly connected to the scraper (74) and flexible brush filaments (733) slidably connected to the rigid brush handle (732). A compression spring (734) is provided inside the rigid brush handle (732). One end of the compression spring (734) abuts against the bottom of the rigid brush handle (732) and the other end abuts against the top of the flexible brush filaments (733), which is used to press the end of the flexible brush filaments (733) against the inner wall of the filter screen (4) with constant pressure.

8. A wastewater treatment device for building drainage according to claim 1, characterized in that, At the connection points between the two ends of the rotating shaft tube (71) and the housing (1), bushings (75) are respectively provided. The inner wall of the bushing (75) is provided with a rotating bearing (751). A retaining ring (752) is embedded in the inner wall of the bushing (75). The inner wall of the rotating bearing (751) is interference-fitted with the outer circumferential surface of the rotating shaft tube (71). The retaining ring (752) is located inside the bushing (75) to prevent hair and other impurities from entangled in the rotating bearing (751).

9. A wastewater treatment device for building drainage according to claim 8, characterized in that, The rotating shaft tube (71) includes a spray hole (711) on the outer surface and a flow groove (712) on the inner wall. The spray hole (711) is located above the gap between the retaining ring (752) and the rotating shaft tube (71). Two one-way sealing tubes (713) are slidably connected inside the rotating shaft tube (71). Flow holes (714) are provided on the outer surface of the two one-way sealing tubes (713). An elastic element (715) is provided on the bottom wall of the rotating shaft tube (71). The two one-way sealing tubes (713) are fixedly connected, and the telescopic end of the elastic element (715) is fixedly connected to the lowest one-way sealing tube (713).

10. A wastewater treatment device for building drainage according to claim 9, characterized in that, The rotating shaft tube (71) is connected to an external liquid pumping device. When the liquid pumping device pumps clean water into the rotating shaft tube (71), it will push the one-way sealing tube (713) downward to make the flow hole (714) and the spray hole (711) coincide. The clean water is sprayed downward through the spray hole (711) to clean the impurities accumulated in the retaining ring (752).

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