A sedimentation tank for sewage treatment
By introducing structures such as arc-shaped sludge guide plates and flow guide pipes into the sedimentation tank, the problems of diffusion and retention of sedimented sludge at the inlet of the sludge discharge hopper are solved, realizing efficient and directional introduction of sedimented sludge, improving sludge discharge efficiency and reducing energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUHAN FANGYUAN NEW TECH DEV CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-06-02
AI Technical Summary
The existing sedimentation tank scrapers lack a targeted end-point guidance mechanism when scraping the sedimented sludge towards the sludge discharge hopper, causing the sedimented sludge flow to spread, stagnate, or flow back at the sludge discharge hopper inlet, reducing scraping efficiency and sludge discharge effect.
An arc-shaped mud guide plate and guide pipe were designed, which, together with a scraper and a mud-blocking cover, form a forced end-guided structure to ensure that the settled mud flows smoothly into the mud discharge hopper. Through the cooperation of the guide strip and the guide pipe, the efficient and directional introduction of settled mud is achieved.
It significantly improves the efficiency of sludge scraping and collection, shortens the residence time of sludge, enhances sludge discharge efficiency, reduces operating resistance and energy consumption, and lowers maintenance requirements.
Smart Images
Figure CN224313320U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater treatment technology, specifically to a sedimentation tank for wastewater treatment. Background Technology
[0002] Existing sludge scraping devices for sedimentation tanks typically use scrapers designed as simple straight plates or flat plates with a basic angle. When scraping the settled sludge from the bottom of the tank towards the discharge point, they lack a targeted end-point guidance mechanism. When the scraper moves close to the discharge hopper area, the scraped sludge flow is prone to diffusion, stagnation, or even backflow due to sudden changes in direction or lack of sustained thrust. This prevents efficient, smooth, and directional flow of sludge into the narrow inlet of the discharge hopper, resulting in some sludge accumulating around the hopper or requiring a longer scraping stroke to finally enter the hopper. This significantly reduces the overall scraping efficiency and sludge discharge effect. Utility Model Content
[0003] This invention proposes a sedimentation tank for wastewater treatment, which solves the problem in the prior art that the sedimented sludge flow in the sedimentation tank is difficult to effectively converge and be centrally introduced at the sludge discharge hopper inlet.
[0004] The technical solution of this utility model is implemented as follows:
[0005] A sedimentation tank for wastewater treatment includes a sedimentation tank and a sedimentation chamber disposed therein, wherein a sludge discharge hopper is provided at the bottom of the sedimentation chamber; a sludge scraper motor is provided above the sedimentation chamber, and two parallel sludge scraper blades are respectively provided on both sides of the output end of the sludge scraper motor, and a sludge guide plate is provided on the side of the sludge scraper blades near the sludge discharge hopper to guide the sedimented sludge to flow to the sludge discharge hopper.
[0006] Furthermore, the mud guide plate is arc-shaped, and the end of the mud guide plate is close to the side of the mud discharge hopper.
[0007] Furthermore, the mud-guiding plate is provided with multiple guide pipes, one end of which extends to the top of the mud discharge hopper, and the other end is connected to the outer side of the arc of the mud-guiding plate; and the guide pipe is connected to the inner side of the arc of the mud-guiding plate.
[0008] Furthermore, the scraper is provided with multiple guide strips on the side away from the guide plate, and the movement of the guide plate allows the sedimented mud to be guided to flow through the gaps between the guide strips.
[0009] Furthermore, the top of the scraper is provided with a mud-blocking cover plate, which together with the mud-guiding plate, the scraper, and the bottom of the sedimentation chamber forms a guide channel that provides a path for the flow of sedimented mud.
[0010] The beneficial effects of the technical solution provided in this application are as follows:
[0011] 1. In the sedimentation tank of this wastewater treatment, the sludge guide plate forms a forced end-guided structure. When the scraper pushes the settled sludge to the sludge discharge hopper area, the sludge guide plate can actively constrain and change the flow direction of the settled sludge, so that it smoothly and easily turns to the inlet of the sludge discharge hopper. This significantly reduces the ineffective accumulation and backflow of settled sludge around the hopper opening, greatly shortens the path and time required for settled sludge to enter the sludge discharge hopper, and thus significantly improves the efficiency and directionality of sludge scraping and collection.
[0012] 2. The sedimentation tank for this wastewater treatment system significantly improves overall sludge removal efficiency and shortens the residence time of sludge in the sedimentation zone, helping to maintain a higher treatment capacity. Secondly, by reducing sludge residue and accumulation in dead corners at the bottom of the tank, it lowers the operating resistance and energy consumption of the sludge scraping system, and reduces the need and frequency of subsequent maintenance and cleaning. Attached Figure Description
[0013] 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.
[0014] Figure 1 This is a schematic diagram of the sedimentation tank for wastewater treatment according to this utility model;
[0015] Figure 2 This is a cross-sectional schematic diagram of the sedimentation tank for wastewater treatment according to this utility model;
[0016] Figure 3 This is a partially enlarged cross-sectional view of the sedimentation chamber of this utility model.
[0017] In the diagram: 10 Sedimentation tank; 20 Sedimentation chamber; 21 Sludge hopper; 22 Sludge scraper motor; 23 Sludge scraper; 24 Sludge guide plate; 25 Guide pipe; 26 Drainage strip; 27 Sludge blocking cover plate; 30 Coagulation tank; 40 Flocculation tank. Detailed Implementation
[0018] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0019] Reference Figure 1-3A sedimentation tank for wastewater treatment includes a sedimentation tank 10 and a sedimentation chamber 20 disposed therein. A sludge discharge hopper 21 is located at the bottom of the sedimentation chamber 20. A sludge scraper motor 22 is located above the sedimentation chamber 20. Two parallel scraper blades 23 are respectively provided on both sides of the output end of the scraper motor 22. A guide plate 24 is provided on the side of the scraper blades 23 near the sludge discharge hopper 21 to guide the flow of sedimented sludge towards the hopper 21. The core function of the guide plate 24 is to forcibly guide and redirect the flow of sedimented sludge pushed by the scraper blades 23. When the scraper blades 23 horizontally scrape the sedimented sludge accumulated at the bottom of the tank to the area near the sludge discharge hopper 21, the guide plate 24 can actively receive and constrain the movement direction of the sedimented sludge flow, effectively overcoming the diffusion, retention, and backflow phenomena caused by sudden changes in flow direction or insufficient thrust. This ensures that the sedimented sludge flow can be smoothly, centrally, and efficiently introduced into the inlet of the sludge discharge hopper 21 below, thereby significantly improving the efficiency of the sedimented sludge entering the hopper and reducing the ineffective accumulation of sedimented sludge around the hopper opening.
[0020] Driven by the scraper motor 22, the scraper blade 23 pushes the settled sludge parallel to the bottom of the tank towards the sludge discharge hopper 21. When the settled sludge flow reaches the end of the scraper blade 23 and is close to the sludge discharge hopper 21, the guide plate 24, through its specific installation position and angle (usually at a certain angle to the scraper blade 23 and pointing towards the inlet of the sludge discharge hopper 21), applies a forced turning force to the settled sludge flow. This turning force guides the settled sludge flow to change its direction of movement along the surface of the guide plate 24, smoothly transitioning from near-horizontal scraping to a downward slope towards the inlet of the sludge discharge hopper 21. This structure effectively shortens the path of the settled sludge into the sludge discharge hopper 21, increases the directionality and concentration of the settled sludge flow towards the sludge discharge hopper 21, and ensures that it is efficiently and thoroughly introduced and collected into the sludge discharge hopper 21 by utilizing the weight of the settled sludge itself and the continuous thrust of the scraper.
[0021] like Figure 3As shown, the mud guide plate 24 is arc-shaped, with its end close to the side of the mud discharge hopper 21. The arc-shaped mud guide plate 24 naturally receives and guides the sedimented mud flow, gradually changing the flow direction of the sedimented mud through its continuous curved surface. This smoothly transitions the sedimented mud from the approximately horizontal scraping trajectory of the scraper plate 23 and focuses it towards the inlet of the mud discharge hopper 21. Compared to straight or simply inclined guide plates, the arc-shaped surface applies a continuously varying guiding force, allowing the movement direction of the sedimented mud particles to gradually and gently deflect from the horizontal direction to an oblique downward direction pointing towards the inlet of the mud discharge hopper 21. This significantly reduces energy loss, turbulence, and sediment separation caused by abrupt changes in flow direction. Meanwhile, the end of the mud guide plate 24 is specially designed to be close to the side of the mud discharge hopper 21. Its function is to form a physical barrier and guide channel at the key position where the sedimented mud flow is about to enter the mud discharge hopper 21. In space, it minimizes the "jump" or "exposed" distance of the sedimented mud flow from the end of the guide plate to the inlet of the mud discharge hopper 21. Under the combined action of the scraping thrust, the gravity of the sedimented mud itself and the guidance of the arc plate, the sedimented mud flow can move closely along the surface of the mud guide plate 24 until its end, and slide directly into or fall into the mud discharge hopper 21 with almost no obstruction. This achieves efficient, low-consumption and leak-free transfer of sedimented mud from scraping to entering the hopper.
[0022] The mud guide plate 24 is provided with multiple guide pipes 25. One end of the guide pipe 25 extends to the top of the mud discharge hopper 21, and the other end is connected to the outer side of the arc of the mud guide plate 24. The guide pipe 25 is connected to the inner side of the arc of the mud guide plate 24, and the sedimentation mud collection area of the mud guide plate 24 is directly connected to the inlet of the mud discharge hopper 21 through the guide pipe 25, forming an additional "settled mud conveying shortcut". When the sludge flows along the surface of the arc-shaped sludge guide plate 24, some of the sludge can be actively sucked or gravity-guided into the sludge discharge hopper 21 through the guide pipe 25. Specifically: because the sludge discharge hopper 24 is continuously discharging sludge, and the fluid can generate negative pressure, when one end of the guide pipe 25 is above the sludge discharge hopper 24, the other end of the guide pipe 25, i.e., the arc of the sludge guide plate 24, will be affected by the negative pressure and adsorb some of the sludge. In addition, because the scraper 23 is continuously rotating, the surface of the scraper 23 will have a continuous fluid pushing force transmitted to the inner side of the arc of the sludge guide plate 24, thereby generating a gravity-guided effect. Some of the sludge accumulated here is guided into the sludge discharge hopper 21 along the arc surface, while the rest of the sludge can be discharged into the sludge discharge hopper 21 through the guide pipe 25. Therefore, the guide pipe 25 can effectively prevent the sludge from accumulating locally on the arc-shaped plate surface.
[0023] In addition, the scraper 23 has multiple guide strips 26 on the side away from the guide plate 24. The movement of the guide plate 24 allows the sedimented mud to be guided by the gaps between the guide strips 26, which serves to pre-guide and structurally control the sedimented mud flow initially scraped by the scraper 23. When the scraper 23 moves, the guide strips 26 on its surface cut the sedimented mud into multiple independent fine streams. Each fine stream is constrained by the sidewall of the guide strip 26, forming a stable laminar flow state within the gap, which significantly inhibits lateral diffusion. The extension direction of each gap is consistent with the movement trajectory of the scraper 23, ensuring that the divided sedimented mud branches are pushed parallel and synchronously to the area of the guide plate 24. This allows the arc-shaped guiding of the guide plate 24 and the diversion effect of the guide pipe 25 to be efficiently combined, forming a complete and efficient mud conveying chain of "initial diversion – middle collection – final guidance". When the scraper blade 23 moves under the drive of the scraper motor 22, the guide strip 26 actively intervenes in the flow state of the sedimented mud through its gap structure, so that the sedimented mud is divided into multiple directional branches in the initial stage of scraping, thereby avoiding the disorderly diffusion of sedimented mud over a large area. The guide channel effect generated by the gap promotes the sedimented mud flow to efficiently converge to the direction of the guide plate 24 along the predetermined path, laying the foundation for subsequent end-point concentrated flow guidance.
[0024] exist Figure 3 In this system, the top of the scraper 23 is equipped with a mud-blocking cover 27. The mud-blocking cover 27, together with the mud-introducing plate 24, the scraper 23, and the bottom of the sedimentation chamber 20, forms a guide channel that provides a path for the flow of sedimented sludge. The core function of the mud-blocking cover 27 is to construct a closed sedimented sludge guide channel. Through the physical barrier of the top cover, it completely prevents sedimented sludge from surging or splashing and contaminating the clear water area during the scraping process, while suppressing the lateral interference of water flow disturbance on the sedimented sludge flow. It also forms a guide channel with a limited cross-section, allowing the sedimented sludge flow pushed by the scraper 23 to maintain a high flow velocity and directional flow within the channel, avoiding kinetic energy dispersion. When the scraper 23 moves along the bottom of the pool, the mud-blocking cover 27 covers its top, forming a trapezoidal guide channel with a gradually narrowing cross-section together with the scraper 23 itself, the bottom of the sedimentation chamber 20, and the mud-introducing plate 24. When the sludge is pushed by the scraper in the tank, due to the physical constraints at the top and sides, the fluid kinetic energy is concentrated in the axial direction of the tank, i.e., the direction of the sludge guide plate 24, forming a forced unidirectional piston flow. This sealed structure also prevents the clear water above the sedimentation chamber 20 from seeping down and interfering with the sludge flow, allowing the sludge flow to be efficiently transported to the sludge guide plate 24 area in a low-resistance environment. After reaching the sludge guide plate 24, the sludge flow naturally turns along the arc-shaped surface and is partially accelerated into the sludge discharge hopper 21 through the guide pipe 25, realizing a fully enclosed and leak-free transfer from scraping to entering the hopper.
[0025] In addition, the sedimentation tank 10 is equipped with a flocculation tank 40 and a coagulation tank 30 on one side of the sedimentation chamber 20. The coagulation tank 30, flocculation tank 40, and sedimentation chamber 20 are arranged in sequence and separated by open partitions, but are connected in sequence. After the sewage flows through the coagulation tank 30 and flocculation tank 40 in sequence, it smoothly enters the sedimentation chamber 20 through the top overflow or bottom channel of the open partition, and the water flow velocity decreases step by step. The open partition design avoids turbulence generated by mechanical water conveying equipment, ensuring that the formed flocs enter the sedimentation chamber 20 intact, making them easier to settle and efficiently collected by the sludge scraper 23, indirectly supporting the efficient operation of core components such as the sludge guide plate 24 and the guide pipe 25. In this embodiment, only the problem of the sedimentation sludge flow in the sedimentation tank being difficult to effectively converge and be centrally introduced at the sludge discharge hopper inlet in the prior art is disclosed. The setting, structure, and principle of the sedimentation tank 10 are conventional technologies and will not be described in detail here.
[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A sedimentation tank for wastewater treatment, characterized in that, It includes a sedimentation tank (10) and a sedimentation chamber (20) inside it. The bottom of the sedimentation chamber (20) is provided with a sludge discharge hopper (21). A sludge scraper motor (22) is provided above the sedimentation chamber (20). Two parallel sludge scraper plates (23) are provided on both sides of the output end of the sludge scraper motor (22). A sludge guide plate (24) is provided on the side of the sludge scraper plate (23) near the sludge discharge hopper (21) to guide the sedimented sludge to flow to the sludge discharge hopper (21).
2. The sedimentation tank for wastewater treatment as described in claim 1, characterized in that, The mud guide plate (24) is arc-shaped, and the end of the mud guide plate (24) is close to the side of the mud discharge hopper (21).
3. The sedimentation tank for wastewater treatment as described in claim 2, characterized in that, The mud-guiding plate (24) is provided with a plurality of guide pipes (25). One end of the guide pipe (25) extends to the top of the mud discharge hopper (21), and the other end is connected to the outer side of the arc of the mud-guiding plate (24); and the guide pipe (25) is connected to the inner side of the arc of the mud-guiding plate (24).
4. The sedimentation tank for wastewater treatment as described in claim 1, characterized in that, The scraper (23) is provided with multiple guide strips (26) on the side away from the guide plate (24). The movement of the guide plate (24) allows the sedimented mud to be guided to flow through the gaps between the guide strips (26).
5. The sedimentation tank for wastewater treatment as described in claim 1, characterized in that, The top of the scraper (23) is provided with a mud-blocking cover (27), which together with the mud-guiding plate (24), the scraper (23) and the bottom of the sedimentation chamber (20) form a guide channel that provides a path for the flow of sedimented mud.