A sedimentation tank with a buffer structure

Abstract

This utility model belongs to the field of wastewater treatment, and in particular, it is a sedimentation tank with a buffer structure. Addressing the problem that existing sedimentation tanks suffer from sludge impacting the bottom structure, causing settled sludge to float a second time, and that sludge easily forms caking due to concentration gradient changes during sedimentation, affecting solid-liquid separation, the following solution is proposed: It includes a sedimentation tank and a stirring assembly. The sedimentation tank has a discharge pipe at the bottom and an opening at the top. A cross-shaped support plate is bolted to the top of the sedimentation tank. A conical cover is fixedly connected to the bottom of the cross-shaped support plate, and a flared pipe is fixedly connected to the bottom of the conical cover. A feed pipe with a 15° upward inclination is installed on the side wall of the flared pipe and sealed with a flange. In this utility model, through the synergistic effect of a multi-stage buffer structure and a low-speed anti-caking device, a breakthrough improvement in sedimentation tank performance is achieved. A dual buffer system consisting of a flared pipe and a conical block is adopted, and the anti-caking system uses a variable-speed stirring mechanism driven by a servo motor.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a sedimentation tank with a buffer structure. Background Technology

[0002] In the field of wastewater treatment, sedimentation tanks, as the core equipment for sludge-water separation, directly affect treatment efficiency and equipment lifespan. Traditional sedimentation tanks generally suffer from two major technical defects:

[0003] Firstly, when mud and water enter the pool in a concentrated jet manner, they directly impact the bottom structure of the pool. Long-term operation can easily cause equipment deformation and damage. At the same time, the high-speed water flow disturbs the sediment layer at the bottom of the pool, causing the settled sludge to float up again.

[0004] Secondly, sludge is prone to caking due to changes in concentration gradient during settling, especially at the bottom of the tank. The accumulation of sludge blocks can clog the sludge discharge pipes, and the high-speed rotation of traditional stirring devices can damage the floc structure, affecting the solid-liquid separation effect.

[0005] To address the aforementioned issues, existing technologies often employ passive protection measures such as increasing the pool wall thickness or installing a single baffle, which cannot fundamentally resolve the technical contradiction between impact protection and anti-caking. Utility Model Content

[0006] The purpose of this invention is to address two major technical defects commonly found in traditional sedimentation tanks: First, when sludge enters the tank via a concentrated jet, it directly impacts the bottom structure, which can easily cause equipment deformation and damage over long-term operation. Simultaneously, the high-speed water flow disturbs the sediment layer at the bottom, causing settled sludge to float a second time. Second, during sedimentation, sludge is prone to caking due to concentration gradient changes, especially at the bottom of the tank, where sludge accumulation can clog the sludge discharge pipes. Furthermore, the high-speed rotation of traditional stirring devices can easily damage the flocculent structure, affecting the solid-liquid separation effect. Therefore, this invention proposes a sedimentation tank with a buffer structure.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A sedimentation tank with a buffer structure includes a sedimentation box and a stirring assembly. The sedimentation box has a discharge pipe at the bottom and an opening at the top. A cross support plate is bolted to the top of the sedimentation box. A conical cover is fixedly connected to the bottom of the cross support plate. A flared pipe is fixedly connected to the bottom of the conical cover. A feed pipe with a 15° upward inclination is provided on the side wall of the flared pipe and sealed by a flange. A buffer assembly is provided inside the conical cover. The stirring assembly includes a servo motor and a reducer fixed to the cross support plate. The output shaft of the reducer extends into the sedimentation box and is connected to a stirring rod. The stirring rod is provided with a first stirring blade and a second stirring blade. When the muddy water enters the flared pipe through the feed pipe, its jet direction forms a 30° angle with the arc surface of the flared pipe to achieve the initial kinetic energy attenuation. With the help of four sets of internal dividing strips, the water flow is divided into four independent streams. When the muddy water diffuses secondary along the surface of the conical block, the conical block is driven by the impact force to generate an axial displacement of 0-30mm along the fixed outer cylinder. The compression spring converts mechanical energy into elastic potential energy through deformation energy storage.

[0009] In one possible design, the buffer assembly includes a fixed outer cylinder fixed to the inner wall of the conical cover and four sets of partition strips. The partition strips are arranged along the generatrix of the conical cover and their right-angled sides are welded to the inner wall of the conical cover and the outer wall of the fixed outer cylinder, respectively. The bottom of the fixed outer cylinder is connected to a fixed base plate. The outer wall of the fixed outer cylinder is fitted with a conical block with clearance. A circular cavity is opened at the bottom of the conical block. The fixed base plate is located in the circular cavity and forms a sliding guide structure. A compression spring is provided between the top of the circular cavity and the fixed base plate.

[0010] In one possible design, three sets of first stirring blades and two sets of second stirring blades are equidistantly arranged along the axial direction on the surface of the stirring rod. The length of the first stirring blade is 400 mm, and the length of the second stirring blade is 250 mm. The stirring blades form a 45° angle with the axis of the stirring rod. The servo motor drives the stirring rod to form a laminar shear field at a speed of 5-15 rpm through a reducer.

[0011] In one possible design, four sets of H-shaped steel supports are welded to the bottom of the settling tank, and maintenance ladders are installed on the side walls of the settling tank. The ladders are made of 40×4mm flat steel and have an inclination angle of 60°.

[0012] In one possible design, the bell-shaped pipe adopts a variable diameter structure, with an inner diameter of 300mm at the inlet end, an inner diameter of 450mm at the outlet end, and a pipe wall thickness of 8mm. The end of the feed pipe is equipped with a flange connection plate.

[0013] In one possible design, the cone block has a cone angle of 90°, and a circular cavity with a depth of 100mm is opened at its bottom. The inner diameter of the circular cavity is 5mm larger than the outer diameter of the fixed outer cylinder, and the edge of the fixed base plate maintains a 2mm gap with the inner wall of the circular cavity.

[0014] In one possible design, when the stirring assembly is running, the stirring rod drives the laminar shear field formed by the first stirring blade and the second stirring blade, the shear rate of which is controlled below 50 seconds⁻¹, keeping the average particle size of the flocs above 1.2 mm and the floc breakage rate below 5%.

[0015] In one possible design, the conical cap has a cone angle of 120°, and the fixed outer cylinder and the conical cap have coaxial circular holes for accommodating the stirring rod and forming a rotary sealing structure.

[0016] In this application, during use, mud and water are fed into the inside of the bell-mouth pipe through the feed pipe. Since one end of the feed pipe is inclined upward, the mud and water first come into contact with the arc surface of the bell-mouth pipe for initial buffering. After some of the rising mud and water is separated by the dividing strip, it slides down in different directions. The remaining mud and water slides down along the inner wall of the bell-mouth pipe.

[0017] The mud and water that have slid down slide down the surface of the cone block again and can be discharged in different directions, which can disperse the discharge location of the mud and water and reduce the impact force of the mud and water. When the mud and water slide down the surface of the cone block, the cone block moves down along the fixed base plate. At this time, the compression spring is squeezed, and the friction between the fixed base plate and the inner wall of the circular cavity achieves buffering again.

[0018] To prevent the mud and water from clumping, the servo motor can be started appropriately. The output shaft of the servo motor drives the stirring rod to rotate through the reducer. The stirring rod drives the second stirring blade and the first stirring blade to rotate, thereby stirring the sediment at the bottom of the mud and water, preventing clumping. It can also continue the flocculation reaction through low-speed rotation, preventing the flocs from breaking.

[0019] Beneficial effects: This application achieves a breakthrough improvement in the performance of sedimentation tanks through the synergistic effect of a multi-stage buffer structure and a low-speed anti-caking device.

[0020] First, a dual buffer system consisting of a flared pipe and a conical block is adopted: when the mud and water enter the flared pipe through the inclined feed pipe, its jet direction forms a 30° angle with the arc surface of the flared pipe. The initial kinetic energy attenuation is achieved through hydrodynamic deflection. In conjunction with the four sets of internal partitions, the water flow is divided into four independent streams, so that the impact energy is dispersed into multiple vector directions. When the mud and water diffuses secondary along the surface of the conical block, the conical block is driven by the impact force to produce an axial displacement of 0-8mm along the fixed outer cylinder. The deformation energy storage process of the compression spring converts mechanical energy into elastic potential energy. Combined with the frictional damping between the fixed bottom plate and the inner wall of the circular cavity, a nonlinear buffer characteristic is formed, which can reduce the mud and water.

[0021] Secondly, the anti-caking system adopts a variable speed stirring mechanism driven by a servo motor: the motor speed is reduced to a low speed range of 5-15 rpm by a reducer, so that the stirring rod drives the first stirring blade and the second stirring blade to form a laminar flow disturbance field, which can prevent mud layer caking and avoid damaging the network structure of flocs; the vertical coaxial design of the stirring device and the buffer structure ensures that the uniformity of the flow field distribution in the pool is improved.

[0022] In addition, the modular design of the conical cover and the removable partition structure reduces equipment maintenance time, while the 304 stainless steel buffer components enhance anti-abrasion life. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of a sedimentation tank with a buffer structure proposed in this utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of a sedimentation tank with a buffer structure proposed in this utility model.

[0025] Figure 3 This is a three-dimensional structural diagram of a funnel-shaped pipe with a buffer structure in a sedimentation tank proposed in this utility model.

[0026] Figure 4 This is a three-dimensional cross-sectional view of a funnel-shaped pipe with a buffer structure in a sedimentation tank according to the present invention.

[0027] Figure 5 This is an exploded view of the funnel-shaped pipe and conical block in a sedimentation tank with a buffer structure proposed in this utility model.

[0028] In the diagram: 1. Settling tank; 2. Cross support plate; 3. Servo motor; 4. Ladder; 5. Discharge pipe; 6. Support; 7. Feed pipe; 8. Trumpet-shaped pipe; 9. Conical block; 10. First stirring blade; 11. Second stirring blade; 12. Stirring rod; 13. Fixed base plate; 14. Conical cover; 15. Divider strip; 16. Circular hole; 17. Fixed outer cylinder; 18. Circular cavity; 19. Compression spring; 20. Reducer. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] In one embodiment; reference Figure 1-5A settling tank is disclosed, the main body of which is a settling box 1 made of carbon steel. A discharge pipe 5 with a diameter of 200 mm is welded to the bottom of the box, and the end of the discharge pipe 5 is equipped with a flange connection structure. An opening is provided at the top of the settling box 1, and a cross support plate 2 is welded to the edge of the opening. An agitator assembly is fixedly installed at the center of the support plate by bolts. The agitator assembly includes a vertically mounted servo motor 3. The output shaft of the motor is connected to the input shaft of a reducer 20 through a coupling. The output shaft of the reducer 20 extends into the interior of the settling box 1, and an agitator rod 12 is welded to its end. Three sets of first agitator blades 10 and two sets of second agitator blades 11 are welded equidistantly along the axial direction on the surface of the agitator rod 12. The blades are made of 316L stainless steel. The length of the first agitator blade 10 is 400 mm, and the length of the second agitator blade 11 is 250 mm. The blades form a 45° angle with the axis of the agitator rod 12.

[0031] A conical cover 14 is welded to the bottom of the cross support plate 2. The conical cover 14 has a cone angle of 120°, and a bell-shaped pipe 8 is welded to its bottom. The bell-shaped pipe 8 adopts a reducing structure, with an inner diameter of 300 mm at the inlet end and an inner diameter of 450 mm at the outlet end, and a wall thickness of 8 mm. The feed pipe 7, which is welded to the side wall of the bell-shaped pipe 8, adopts a 15° upward tilting structure, and a flange connection plate is provided at the pipe end. Four sets of partition strips 15 are welded to the inner wall of the conical cover 14. The partition strips 15 are arranged along the generatrix of the conical cover 14, and the cross section is a right-angled triangle. The right-angled sides are welded to the inner wall of the conical cover 14 and the outer wall of the fixed outer cylinder 17, respectively.

[0032] The core of the buffer assembly is a fixed outer cylinder 17, with a fixed base plate 13 welded to the bottom. A 50mm diameter circular hole 16 is formed in the center of the fixed base plate 13. A conical block 9 is fitted onto the outside of the fixed outer cylinder 17. The cone angle of the conical block 9 is 90°, and a 100mm deep circular cavity 18 is formed at its bottom. The inner diameter of the circular cavity 18 is 5mm larger than the outer diameter of the fixed outer cylinder 17. A compression spring 19 is installed between the top of the circular cavity 18 and the fixed base plate 13. The spring has an outer diameter of 80mm, a wire diameter of 8mm, and a free height of 150mm. When the conical block 9 is impacted by mud and water, it can generate an axial displacement of 0-30mm along the fixed outer cylinder 17. A 2mm gap is maintained between the edge of the fixed base plate 13 and the inner wall of the circular cavity 18, forming a sliding guide structure.

[0033] Four sets of 800 mm high H-shaped steel supports 6 are welded to the bottom of the settling tank 1. A maintenance platform is welded to the side wall of the tank, and the platform surface is covered with anti-slip patterned steel plates. The ladder 4 is welded from 40×4 mm flat steel with an inclination angle of 60°. During operation, the muddy water enters the bell-shaped pipe 8 through the feed pipe 7. It first collides with the inner curved surface of the bell-shaped pipe 8, reducing its flow velocity. Subsequently, it is divided into four independent streams by four sets of separators 15. As the muddy water spreads along the surface of the conical block 9, the conical block 9 experiences a 15 mm displacement due to the impact. The compression spring 19 absorbs the impact energy, and simultaneously, the muddy water forms a 360° annular scattering on the surface of the conical block 9, eventually contacting the sediment layer at the bottom of the tank.

[0034] This application can be used in the field of wastewater treatment, or in other fields applicable to this application.

[0035] In another embodiment; reference Figure 1-5 A sedimentation tank with a buffer structure is used in the field of wastewater treatment. The anti-caking system uses a servo motor 3 to drive the stirring rod 12 to rotate at 8 rpm. The stirring rod 12 drives the first stirring blade 10 and the second stirring blade 11 to form a laminar shear field, with the shear rate controlled below 50 s⁻¹. Under this condition, it can prevent sludge layer caking and maintain the average particle size of flocs above 1.2 mm, with a floc breakage rate of less than 5%. After 72 hours of continuous operation, the uniformity of the sediment layer thickness at the bottom of the tank is maintained within ±5%, the frequency of sludge discharge pipe blockage is reduced to 0.1 times / month, the overall vibration amplitude of the equipment is less than 0.05 mm, and the noise level is controlled below 65 decibels.

[0036] However, as is well known to those skilled in the art, the working principles and wiring methods of the servo motor 3 and the reducer 20 are commonplace and are all conventional methods or common knowledge. They will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A settling basin having a buffer structure, characterized by, The settling tank (1) includes a settling tank (1) and a stirring assembly. The settling tank (1) has a discharge pipe (5) at the bottom and an opening at the top. The top of the settling tank (1) is fastened to a cross support plate (2) by bolts. A conical cover (14) is fixedly connected to the bottom of the cross support plate (2). A flared pipe (8) is fixedly connected to the bottom of the conical cover (14). A feed pipe (7) with an inclination of 15° is set on the side wall of the flared pipe (8) and is sealed by a flange. A buffer assembly is set inside the conical cover (14). The stirring assembly includes a servo motor (3) and a reducer (20) fixed to the cross support plate (2). 0) The output shaft extends into the settling tank (1) and connects to the stirring rod (12). The stirring rod (12) is equipped with a first stirring blade (10) and a second stirring blade (11). When the mud and water enter the horn-mouth pipe (8) through the feed pipe (7), its jet direction forms a 30° angle with the horn-mouth arc surface to achieve the first kinetic energy attenuation. With the help of the four sets of internal dividing strips (15), the water flow is divided into four independent streams. When the mud and water diffuses for the second time along the surface of the cone block (9), the cone block (9) is driven by the impact force to generate an axial displacement of 0-30mm along the fixed outer cylinder (17). The compression spring (19) converts mechanical energy into elastic potential energy through deformation energy storage.

2. The sedimentation basin with a buffer structure according to claim 1, characterized in that, The buffer assembly includes a fixed outer cylinder (17) fixed to the inner wall of the conical cover (14) and four sets of partition strips (15). The partition strips (15) are arranged along the generatrix of the conical cover (14) and their right-angled sides are welded to the inner wall of the conical cover (14) and the outer wall of the fixed outer cylinder (17) respectively. The bottom of the fixed outer cylinder (17) is connected to a fixed base plate (13). The outer wall of the fixed outer cylinder (17) is fitted with a conical block (9) with a clearance. The bottom of the conical block (9) has a circular cavity (18). The fixed base plate (13) is located in the circular cavity (18) and forms a sliding guide structure. A compression spring (19) is provided between the top of the circular cavity (18) and the fixed base plate (13).

3. A sedimentation tank with a buffer structure according to claim 1 or 2, characterized in that, The surface of the stirring rod (12) is equidistantly provided with three sets of first stirring blades (10) and two sets of second stirring blades (11) along the axial direction. The length of the first stirring blade (10) is 400mm, and the length of the second stirring blade (11) is 250mm. The stirring blades are at a 45° angle to the axis of the stirring rod (12). The servo motor (3) drives the stirring rod (12) to form a laminar shear field at a speed of 5-15rpm through the reducer (20).

4. The clarifier with a buffer structure according to claim 1, wherein, The bottom of the settling box (1) is welded with four sets of H-shaped steel supports (6), and the side wall of the settling box (1) is provided with maintenance ladders (4). The ladders (4) are made of 40×4mm flat steel and have an inclination angle of 60°.

5. The clarifier with a buffer structure according to claim 1, wherein, The bell-mouth pipe (8) adopts a variable diameter structure, with an inner diameter of 300mm at the inlet end, an inner diameter of 450mm at the outlet end, and a pipe wall thickness of 8mm. The feed pipe (7) is equipped with a flange connection plate at its end.

6. The sedimentation basin with a buffer structure according to claim 2, characterized in that, The cone block (9) has a cone angle of 90° and a circular cavity (18) with a depth of 100 mm at its bottom. The inner diameter of the circular cavity (18) is 5 mm larger than the outer diameter of the fixed outer cylinder (17). The edge of the fixed base plate (13) maintains a 2 mm gap with the inner wall of the circular cavity (18).

7. The sedimentation basin with a buffer structure according to claim 3, characterized in that, The conical cover (14) has a cone angle of 120°. The fixed outer cylinder (17) and the conical cover (14) have a coaxial circular hole (16). The circular hole (16) is used to accommodate the stirring rod (12) and form a rotary sealing structure.

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