A sedimentation device applied to water treatment

Abstract

This invention provides a sedimentation device for water treatment, relating to the field of wastewater purification. It includes: a slow-flow feeding section for feeding material into a cylinder, and comprising a slow-flow structure to reduce the downward flow velocity of the water; a stirring section located in the lower part of the cylinder for stirring the water and sediment within the cylinder; and an overflow trough located above the cylinder for overflowing and discharging the settled water. This invention injects wastewater into the cylinder through the slow-flow feeding section. As the water descends within the cylinder, the slow-flow structure slows its flow, allowing more time for the water to react with chemicals, promoting flocculation of impurities and improving sedimentation efficiency. Furthermore, the stirring section further enhances flocculation and sedimentation efficiency, and prevents sediment from accumulating in the lower part of the cylinder, thus avoiding blockage of the sludge and wastewater discharge outlets. The settled water is discharged into the overflow trough, achieving efficient separation of clean water and sediment, resulting in higher cleanliness of the settled water.

Description

Technical Field

[0001] This invention relates to the field of wastewater purification and treatment, and in particular to a sedimentation device for water treatment. Background Technology

[0002] Sedimentation is a crucial step in conventional water treatment processes and a common method for removing suspended solids from water. It can be used as a pretreatment in combination with other processes, or as the final stage before discharge into certain water bodies. During sedimentation, suspended solids in water primarily settle due to gravity. The sedimentation effect is closely related to the size of the suspended solids and their surrounding environment. Good sedimentation occurs when the suspended solids are in a relatively stable and smooth environment. Therefore, the sedimentation effect is closely related to the internal structure of the sedimentation equipment.

[0003] Currently, modifications to sedimentation equipment mainly focus on adding inclined plates or tubes, with limited research on the internal structure. The internal structure of sedimentation equipment significantly impacts not only the uniformity of mixing suspended solids and reagents in the water but also the settling stability of the formed flocs. Optimizing the design of sedimentation equipment can accelerate floc settling while minimizing water flow disturbance within the equipment, thus preventing significant floc breakage. Therefore, the development of high-efficiency sedimentation devices is of great significance to the water treatment industry.

[0004] A typical sedimentation device consists of a tank, an overflow weir, a drive shaft, and a sludge rake. The overflow weir is located at the top of the tank; once the water level reaches a certain point, it flows out through the weir. The drive shaft is located in the middle of the tank, and the sludge rake, connected to the drive shaft, is located at the bottom of the tank. The disadvantages of conventional sedimentation tanks are that they are open tanks, often civil engineering structures, requiring significant investment and floor space. Water enters the tank through a left-side inlet pipe, and suspended solids settle by gravity, which is time-consuming and the entire system is susceptible to changes in water flow. Furthermore, because the water flows directly to the bottom and the sludge rake rotates slowly, the coagulation of suspended flocs and chemicals is insufficient, resulting in small suspended floc volumes and low overall sedimentation efficiency.

[0005] Patent CN 111643933 A discloses an aerated inclined plate sedimentation tank. This device features continuously inclined plates and aeration pipes. The agitation of air bubbles promotes the interaction of suspended particles in the wastewater, resulting in natural flocculation. Passing through the angled plates further improves sedimentation efficiency and enhances the device's sedimentation capacity. Patent CN109467206 A discloses a deep water treatment device. In this device, water enters through an inlet pipe, passes through a vertical flow sedimentation component and a rebound component, and then enters an inclined tube sedimentation component, achieving a certain degree of mud-water separation. This improves sedimentation efficiency and also facilitates the flow rate of wastewater within the device, ensuring system stability. The drawback of the above-mentioned prior art is that although the addition of inclined plate components in the tank facilitates the settling of suspended flocs to some extent, the lack of a sludge rake makes the bottom of the tank and the aeration ports prone to clogging when the water quality is poor.

[0006] Furthermore, in the aforementioned sedimentation device structure, the water directly enters the tank. Due to the high water flow rate inside the tank, the water and the reagents are not mixed evenly, resulting in an insufficient sedimentation reaction process, which in turn affects the sedimentation efficiency. Summary of the Invention

[0007] The purpose of this invention is to provide a sedimentation device for water treatment, which can make water and reagents fully mixed again during the flow of water in the sedimentation device through a slow-flow feeding section, and improve the sedimentation efficiency of the precipitate and avoid clogging;

[0008] The present invention provides a sedimentation device for water treatment, comprising: a slow-flow feeding section for feeding into a cylinder and including a slow-flow structure for slowing down the downward flow velocity of the water; a stirring section located in the lower part of the cylinder for stirring the water and the lower sediment in the cylinder; and an overflow trough located above the cylinder for overflowing and discharging the sedimented water in the cylinder.

[0009] Furthermore, the cylinder body is provided with a central inclined plate in the middle, which is used to receive the flocculent material in the cylinder body and guide it obliquely downward to the lower part of the cylinder body.

[0010] Furthermore, the slow-flow feeding section includes an upper feeding cylinder, which includes a water distribution plate and a short connecting pipe. The slow-flow structure includes water-permeable holes located on the water distribution plate and / or several openings of different heights located on the short connecting pipe.

[0011] Furthermore, the slow-flow feeding section also includes a central feeding cylinder, which extends downward from the upper feeding cylinder to the lower part of the cylinder body, and the slow-flow structure includes a spiral baffle disposed in the central feeding cylinder.

[0012] Furthermore, the outer edge of the spiral partition is raised upwards, and several guide holes are provided on the central feed cylinder along the tangential direction of the spiral partition.

[0013] Furthermore, a sleeve is provided on the outer side of the central feed cylinder, a buffer port is connected to the bottom end of the central feed cylinder, a buffer plate is provided below the buffer port, and the outer side of the buffer port is a downwardly flared slope.

[0014] Furthermore, the stirring unit includes a sludge rake located in the lower part of the cylinder, and the sludge rake is connected to a drive device outside the cylinder via a main shaft.

[0015] Furthermore, the lower part of the cylinder is provided with a primary lower cone and a secondary lower cone. The secondary lower cone is located in the middle of the primary lower cone, and the inclination of the secondary lower cone is greater than that of the primary lower cone. A mud outlet pipe is provided in the middle of the secondary lower cone.

[0016] Furthermore, the bottom of the overflow trough is inclined, and a water outlet pipe is provided at the lower end of the overflow trough.

[0017] Furthermore, the central inclined plate portion includes: an inner central cylinder, with a plurality of partitions spaced apart on the outside of the inner central cylinder, and the lower outer side of the inner central cylinder being a downwardly flared inclined surface; or: an inner central cylinder, with a plurality of inclined partitions spaced apart on the outside of the inner central cylinder.

[0018] The technical solution of this invention involves injecting wastewater into the cylinder through a slow-flow feeding section. As the water descends within the cylinder, the slow-flow structure allows for greater time for the water to react with the chemicals, promoting flocculation of impurities and improving sedimentation efficiency. Furthermore, the stirring section further enhances flocculation and sedimentation efficiency, preventing sediment from accumulating in the lower part of the cylinder and clogging the sludge and wastewater discharge ports. The settled water is then discharged through an overflow tank, achieving efficient separation of clean water and sediment, resulting in a higher level of cleanliness in the settled water. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 For the present invention Figure 1 The main view;

[0022] Figure 3 For the present invention Figure 1 Side view;

[0023] Figure 4 For the present invention Figure 3 AA section view;

[0024] Figure 5 This is a schematic diagram of the stirring section, upper feed cylinder, and central feed cylinder of the present invention;

[0025] Figure 6 This is a schematic diagram of the first type of central inclined plate structure of the present invention;

[0026] Figure 7 This is a schematic diagram of the second type of central inclined plate structure of the present invention;

[0027] Figure 8 This is a schematic diagram of the upper feed cylinder structure of the present invention;

[0028] Figure 9 For the present invention Figure 8 AA section view;

[0029] Figure 10 This is a schematic diagram of the first type of permeable hole structure of the present invention;

[0030] Figure 11 This is a schematic diagram of the second permeable hole structure of the present invention;

[0031] Figure 12 This is a schematic diagram of the short pipe structure of the present invention;

[0032] Figure 13 For the present invention Figure 12 Top view;

[0033] Figure 14 This is a schematic diagram of the central feed cylinder structure of the present invention;

[0034] Figure 15 This is a schematic diagram of the internal structure of the central feed cylinder of the present invention;

[0035] Figure 16 This is a schematic diagram of the spiral baffle and guide hole structure of the present invention;

[0036] Figure 17 This is a schematic diagram of the first type of buffer port structure of the present invention;

[0037] Figure 18 This is a schematic diagram of the second type of buffer port structure of the present invention;

[0038] Figure 19 This is a top view of the buffer opening of the present invention;

[0039] Explanation of reference numerals in the attached figures:

[0040] 1-Cylinder body, 101-First-stage lower cone, 102-Second-stage lower cone, 103-Sludge discharge pipe, 104-Floc observation window, 105-Stabilizing support, 2-Mixing section, 201-Sludge rake, 202-Main shaft, 203-Motor, 3-Overflow trough, 301-Water discharge pipe, 4-Central inclined plate section, 401-Inner central cylinder, 402-Baffle plate, 403-Inner cone, 404-Outer central cylinder, 5-Upper feed cylinder, 501-Water distribution plate, 502-Short pipe, 503-Water inlet pipe, 6-Central feed cylinder, 601-Inner cylinder body, 602-Sleeve, 603-Guide hole, 7-Slow flow structure, 701-Water permeable hole, 702-Opening, 703-Spiral baffle, 8-Buffer port, 801-Buffer plate, 9-Beam frame. Detailed Implementation

[0041] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and 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 limiting this invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] Example 1

[0045] like Figures 1-5 As shown, the present invention provides a sedimentation device for water treatment, comprising: a slow-flow feeding section for feeding material into a cylinder 1, and including a slow-flow structure 7 for slowing down the downward flow of water; a stirring section 2 located in the lower part of the cylinder 1 for stirring the water in the cylinder 1 and the lower sediment; and an overflow tank 3 located above the cylinder 1 for overflowing and discharging the sedimented water in the cylinder 1.

[0046] Specifically, the cylinder 1 is hollow inside. The upper end of the slow-flow feeding section is connected to the feed pipe, and the lower end extends into the lower part of the cylinder 1. Wastewater is injected through the feed pipe, along with flocculant, into the cylinder 1. During the descent inside the cylinder 1, impurities flocculate into large particles and settle to the lower part of the cylinder 1, where they are discharged through the sludge outlet pipe 103. Due to the effect of the slow-flow structure 7, the water takes longer to descend to the lower part of the cylinder 1, thus allowing more time for the flocculation process, resulting in higher sedimentation efficiency and saving the volume of the cylinder 1, allowing for a lower height. The clean water after sedimentation accumulates in the space outside the slow-flow feeding section inside the cylinder 1. When it overflows the top edge of the cylinder 1, it enters the overflow trough 3 and is discharged through the outlet pipe 301 on the overflow trough 3.

[0047] Example 2

[0048] This embodiment 2 specifically describes the central inclined plate part 4.

[0049] like Figures 6-7 As shown, a central inclined plate section 4 is also provided in the middle of the cylinder 1, which is used to receive the flocculent material in the cylinder 1 and guide it obliquely downward to the lower part of the cylinder 1. The central inclined plate section 4 includes: an inner central cylinder 401, with a plurality of baffles 402 spaced apart on the outside of the inner central cylinder 401, and the lower outer side of the inner central cylinder 401 is an inclined surface that flares downward; or; an inner central cylinder 401, with a plurality of inclined baffles 402 spaced apart on the outside of the inner central cylinder 401.

[0050] Specifically, the central inclined plate 4 is located in the middle of the cylinder 1, or more specifically, below the overflow trough 3 and above the lower part (sedimentation zone) of the cylinder 1. Its main function is to guide the suspended flocculent particles in the cylinder 1 to the outer edge of the cylinder 1 when they sink to the inclined surface of the central inclined plate 4. This is because the buoyancy they experience after contacting the inclined surface of the central inclined plate 4 is smaller, making it easier for them to slide down the inclined surface and settle, thus improving sedimentation efficiency. On the other hand, there is a stirring part 2 (sludge rake 201) in the central position of the lower part of the cylinder 1, which stirs the particles. Settling from the outer edge of the cylinder can avoid the influence of stirring and circling.

[0051] There are two implementation schemes for the central inclined plate section 4. One scheme consists of an inner central cylinder 401, baffles 402, an inner cone 403, and an outer central cylinder 404. The inner central cylinder 401, inner cone 403, and outer central cylinder 404 are connected sequentially from top to bottom. Baffles 402 are evenly distributed on the outer sides of the inner central cylinder 401, inner cone 403, and outer central cylinder 404, with 3 to 8 baffles. The overall height of the central inclined plate section 4 is 1 / 2 to 2 / 3 of the height of the cylinder 1. The lower edge of the inner central cylinder 401 is located between the inclined baffles of the buffer port 8. The inner cone 403 serves as the aforementioned inclined surface, and the baffles 402 prevent flocculated particles from flowing around the flow, allowing them to settle downwards more effectively.

[0052] Another type is the central inclined plate section 4, which consists of an inner central cylinder 401 and baffles 402. The diameter of the inner central cylinder 401 is 2-2.5 times the diameter of the central feed cylinder 6, and its height is 1 / 2 to 3 / 5 of the height of the cylinder body 1. The baffles 402 are evenly distributed on the inner central cylinder 401, with an inclination angle of 65° to 75°. The number of baffles is determined based on the water quality and the effluent target. The inclined baffles 402 serve the aforementioned inclined surface function and simultaneously prevent flocculent particles from flowing around the flow, allowing them to settle downwards more effectively.

[0053] Example 3

[0054] This embodiment 3 specifically describes the slow-flow feed section.

[0055] like Figures 5-19 As shown, the slow-flow feeding section includes an upper feeding cylinder 5, which includes a water distribution plate 501 and a short connecting pipe 502. The slow-flow structure 7 includes water permeable holes 701 on the water distribution plate 501 and / or several openings 702 at different heights on the short connecting pipe 502. The slow-flow feeding section also includes a central feeding cylinder 6, which extends downward from inside the upper feeding cylinder 5 to the lower part of the cylinder body 1. The slow-flow structure 7 includes a spiral baffle 703 disposed inside the central feeding cylinder 6. The outer edge of the spiral baffle 703 is raised upward, and several guide holes 603 are provided on the central feeding cylinder 6 along the tangential direction of the spiral baffle 703. A sleeve 602 is provided on the outer side of the central feeding cylinder 6, and a buffer port 8 is connected to the bottom end of the central feeding cylinder 6. A buffer plate 801 is provided below the buffer port 8, and the outer surface of the buffer port 8 is a downwardly flared slope.

[0056] Specifically, the upper feed cylinder 5 mainly consists of a water distribution plate 501 and a short connecting pipe 502. The water distribution plate 501 is a plate-shaped component, which, together with the side plate and the top plate, forms a water storage cavity for containing clean water. The short connecting pipe 502 is a tubular component that penetrates the water distribution plate 501 and extends above the water distribution plate 501 and into the water storage cavity. The water inlet pipe 503 connects to the water storage cavity to inject water into it. In this structure, the diameter of the water storage cavity wall is 1.5 to 3 times the diameter of the water inlet pipe 503, and the height is 2.5 to 4 times the diameter of the water inlet pipe 503. Among them, the water distribution plate 501... There are two implementation schemes for the permeable hole 701: one is perforated and the other is annular. The opening ratio of both plates is related to the water inflow. The height of the short pipe 502 is 1.15 to 1.5 times the height of the water storage chamber, and the distance between its top and the top of the water storage chamber is 1 / 4 to 1 / 3. At the same time, in order to divert the incoming water, an opening 702 is made in its upper part. The number of openings 702 is related to the diameter of the short pipe 502 and the water inflow. In addition, in order to make the water flow evenly downward, a certain number of diversion plates can also be installed inside the short pipe 502.

[0057] like Figure 16 As shown, the central feed cylinder is one of the main components of this device, consisting of an inner cylinder 601 and an outer sleeve 602. The outer sleeve 602 has a diameter ≥ 2.5 times the inner diameter of the water inlet pipe 503; the inner cylinder 601 has a diameter ≥ 2 times the inner diameter of the water inlet pipe 503, and dosing ports are provided at the upper, middle and lower parts of the inner cylinder 601. The spiral baffle 703 is fitted to the inner wall of the inner cylinder 601, forming a spiral downward flow guiding structure. The length and width of the spiral baffle 703 are slightly smaller than the length and inner diameter of the central feed cylinder, and the outer edge is slightly raised. The inner cylinder 601 has a certain number of small holes along the tangent of the spiral baffle 703, which are the flow guiding holes 603. The shape, position and number of the flow guiding holes 603 are related to the properties of the water. The advantage of this structure is that the centrifugal force generated by the larger mass and larger particle size flocs when they move around the flow is greater than the resistance of the spiral baffle 703, so that they flow from the flow guiding holes 603 on the inner cylinder 601 to the outer cylinder 1 with the water flow. The smaller particle size and lighter mass flocs, due to insufficient centrifugal force, still flow downward on the inner cylinder spiral baffle 703. This process enables the flocs of different particle sizes in the water to be classified, reducing the phenomenon of floc breakage due to collision between flocs.

[0058] There are two implementation schemes for the buffer port 8. One implementation scheme consists of an inclined baffle (i.e., the outer side of the buffer port 8) and a bottom buffer plate 801. The inclined baffle and the buffer plate 801 are connected by four evenly distributed columns. The angle of the inclined baffle is between 90° and 150°. The distance between the bottom end of the inclined baffle and the upper surface of the bottom buffer plate is ≥ 1.2 times the inner diameter of the inlet pipe 503. When water and small flocculated particles fall from the inner cylinder 601 of the central feed cylinder 6, they come into contact with the buffer plate 801 and flow out to the open sides, slowing down the flow rate and avoiding the influence of the sludge rake 201. Large flocculated particles fall from between the inner cylinder 601 and the outer sleeve 602, come into contact with the inclined surface of the inclined baffle, and are guided to the surrounding sludge layer.

[0059] Another implementation scheme consists of an inclined baffle and a bottom buffer plate 801, connected by four evenly distributed columns. The angle of the inclined baffle ranges from 90° to 150°, and the distance from the bottom of the inclined baffle to the lower surface of the bottom buffer plate 801 is ≥ 1.2 times the inner diameter of the inlet pipe 503. The bottom of this structure is a conical surface with an inclined angle ranging from 145° to 165°. The difference from the first implementation scheme is that the inclined conical surface at the bottom functions similarly to the inclined baffle, guiding the water and small flocculent particles falling from the inner cylinder 601 of the central feed cylinder 6.

[0060] Example 4

[0061] This embodiment 4 specifically describes the stirring section 2.

[0062] like Figures 1-5 As shown, the stirring unit 2 includes a sludge rake 201, which is located in the lower part of the cylinder 1. The sludge rake 201 is connected to a drive device outside the cylinder 1 via a main shaft 202.

[0063] Specifically, the horizontal length of the sludge rake 201 is approximately 7 / 8 to 15 / 16 of the inner diameter of the cylinder 114. Both sides are parallel to the first-stage lower cone 101, and each side is equipped with 2-4 scraper blades. The angle between the upper part of the scraper blade and the sides is between 0° and 30°, and the lower part is parallel to the first-stage lower cone 101. The vertical distance from the lower part of the scraper blade to the bottom edge is related to the inner diameter of the cylinder 114. A beam frame 9 is fixed on the overflow trough 3. The driving device is specifically a motor 203, which is fixed on the beam frame 9. The main shaft 202 passes through the central feed cylinder 6, with its upper end connected to the motor 203 and its lower end connected to the sludge rake 201, thus driving the sludge rake 201 to rotate. Under the action of the rotation of the sludge rake 201, the flocs deposited on both sides are accelerated to flow towards the sludge discharge pipe 103 and finally discharged. The height of the main shaft 202 is approximately 2 / 3 to 3 / 4 of the height of the cylinder 1.

[0064] Example 5

[0065] This embodiment 5 describes the structure of cylinder 1 in detail.

[0066] like Figures 1-4 As shown, the lower part of the cylinder 1 is provided with a primary lower cone 101 and a secondary lower cone 102. The secondary lower cone 102 is located in the middle of the primary lower cone 101, and the inclination of the secondary lower cone 102 is greater than that of the primary lower cone 101. A mud discharge pipe 103 is provided in the middle of the secondary lower cone 102. The bottom of the overflow trough 3 is inclined, and a water discharge pipe 301 is provided at the lower end of the overflow trough 3.

[0067] Specifically, the cylinder 1 has a floc observation window 104. The inlet pipe 503 and outlet pipe 301 are at 180° to each other and are on the same center line as the floc observation window 104 on the cylinder 1. The bottom of the cylinder 1 is provided with a stable support 105 for support. The first-stage lower cone 101 has a smaller inclination than the second-stage lower cone 102. The flocs fall onto the first-stage lower cone 101 first. The inclined cone surface accelerates the settling towards the second-stage lower cone 102. The second-stage lower cone 102 has a higher inclination, which further accelerates the settling and also acts as a bucket-shaped material agglomerator, making it easier for the agglomerated flocs to be discharged from the mud outlet pipe 103. The top edge of the cylinder 1 is provided with an undulating, notch-shaped overflow weir for the clear liquid in the cylinder 1 to overflow into the overflow trough 3 and be discharged into the outlet pipe 301 along the inclined direction of the overflow trough 3.

[0068] The working principle of this device is:

[0069] After the initial chemical treatment, the water first enters the upper feed cylinder 5 through the inlet pipe 503. Due to its internal structure, the upper feed cylinder 5 allows the water to remain inside for a certain period of time, while simultaneously diverting the water flow into the central feed cylinder 6. Most of the water flows evenly to the spiral baffle 703 through the water distribution plate 501, while a small amount falls directly from the center through the openings 702 at both ends of the short pipe 502 (the higher side of the opening 702 corresponds to the inlet pipe 503, thus reducing the water flow velocity and allowing the water to flow slowly downwards). During this descent, due to the surrounding water flow and gravity, some of the water flows back to the spiral baffle 703, while some flows along the stirring shaft to the bottom of the cylinder. Additionally, a very small amount of water flows directly into the bottom of the cylinder through the gap between the short pipe 502 and the water distribution plate 501. Because the spiral baffle 703 has an upwardly curved outer edge structure, the centrifugal force generated by the larger mass and particle size flocs is greater than the resistance of the spiral baffle 703. This causes the flocs to flow from the guide hole 603 on the inner cylinder 601 to the outer cylinder 1 with the water flow. Meanwhile, the smaller particle size and lighter mass flocs, due to insufficient centrifugal force, still flow downward on the inner cylinder spiral baffle 703. This process allows the flocs of different particle sizes in the water to be classified, reducing the phenomenon of floc breakage due to collision between flocs.

[0070] In addition, when the water flow rate is large or the turbidity is high, the water dosing can be divided into two parts. One part of the agent is added before the water enters the device, and the other part is added at multiple points on the side wall of the central feed cylinder 6 after the water enters the device. The purpose of adding the agent at this point is to perform secondary flocculation of the broken flocs caused by the water flow, thereby improving the treatment efficiency. Due to the structural characteristics of the upper feed cylinder 5 and the central feed cylinder 6, the residence time of the water and the mixing time of the agent are increased. Therefore, the amount of agent added at multiple points gradually decreases from top to bottom. When the water level surpasses the sludge rake 201, the motor 203 is started. The motor 203 drives the sludge rake 201 to rotate slowly through the upper feed cylinder 5 and the main shaft 202. When the water level in the cylinder 1 gradually rises and reaches the top of the cylinder 1, the settled water flows into the overflow trough 3 through the overflow structure. The settled water is finally discharged through the outlet pipe 301. During this period, the larger flocs formed in the water are accelerated to settle downwards by the central inclined plate 4. Some flocs directly enter the first-stage lower cone 101 and the second-stage lower cone 102. This is the inclined area in the device. The inclination angle of the first-stage lower cone 101 is smaller than that of the second-stage lower cone 102. The flocs will settle faster when they fall on the inclined cone surface. Some flocs fall on both sides of the first-stage lower cone 101 and are not easy to slip off. At this time, under the action of the rotation of the sludge rake 201, the flocs deposited on both sides are accelerated to flow towards the sludge outlet pipe 103 and are finally discharged.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sedimentation device for water treatment, characterized in that, The application relates to a water treatment device, which comprises a slow-flow feeding part for feeding water into a cylinder, a stirring part located in the lower part of the cylinder for stirring the water in the cylinder and the precipitate in the lower part, and an overflow tank located on the cylinder for discharging the precipitate in the cylinder. The slow-flow feeding part comprises a central feeding cylinder and an upper feeding cylinder, the central feeding cylinder extends downward from the upper feeding cylinder into the lower part of the cylinder, and the slow-flow structure comprises a spiral partition plate arranged in the central feeding cylinder; the upper feeding cylinder comprises a water distribution plate and a short connecting pipe, the slow-flow structure comprises water-permeable holes on the water distribution plate and / or a plurality of openings with different heights on the short connecting pipe; the water distribution plate is a plate-shaped part and forms a water storage cavity together with side plates and a top plate for containing clean water, and the short connecting pipe is a pipe-shaped part which penetrates through the water distribution plate and extends into the water storage cavity above the water distribution plate. The outer edge of the spiral partition plate is raised upward, and a plurality of flow guide holes are arranged on the tangent direction of the spiral partition plate on the central feeding cylinder. The central feeding cylinder comprises an inner cylinder body, and a sleeve is arranged on the outer side of the inner cylinder body. The bottom end of the central feeding cylinder is connected with a buffer port, a buffer plate is arranged below the buffer port, and the outer side of the buffer port is a downwardly flared inclined surface; the buffer port is composed of an inclined baffle and a bottom buffer plate, and the inclined baffle and the buffer plate are connected through four evenly distributed vertical columns. When the floc with large mass and large particle size makes a flow around motion, the centrifugal force generated is greater than the resistance of the spiral partition plate, so that the floc flows into the sleeve along the water flow through the flow guide holes on the inner cylinder body; the floc with small particle size and light mass still flows downward on the spiral partition plate of the inner cylinder body due to insufficient centrifugal force, so that the flocs with different particle sizes in the water are classified, and the phenomenon of floc breakage caused by collision between the flocs is reduced. When the water and small-particle flocs fall from the inner cylinder body of the central feeding cylinder, the buffer plate is contacted and the flocs flow out to the four sides, the flow rate is slowed down, and the flocs are prevented from being affected by the sludge rake; the large-particle flocs fall from between the inner cylinder body and the outer sleeve, contact the inclined surface of the inclined baffle, and are guided to the sludge layer around. A central inclined plate part is further arranged in the middle part of the cylinder for receiving the flocculation material in the cylinder and guiding the flocculation material to flow downward to the lower part of the cylinder. The stirring part comprises a sludge rake, the sludge rake is located in the lower part of the cylinder, and the sludge rake is connected to a driving device outside the cylinder through a main shaft. A first lower cone body and a second lower cone body are arranged in the lower part of the cylinder, the second lower cone body is located in the middle part of the first lower cone body, the inclination of the second lower cone body is greater than that of the first lower cone body, and a sludge outlet pipe is arranged in the middle part of the second lower cone body.

2. The sedimentation device for water treatment according to claim 1, characterized in that, The bottom of the overflow tank has an inclination, and a water outlet pipe is arranged at the low end of the overflow tank.

3. The sedimentation device for water treatment according to claim 1, characterized in that, The central inclined plate part comprises an inner central cylinder, a plurality of partition plates are arranged on the outer side of the inner central cylinder, and the lower side of the inner central cylinder is a downwardly flared inclined surface; or the central inclined plate part comprises an inner central cylinder, and a plurality of inclined partition plates are arranged on the outer side of the inner central cylinder.

4. The sedimentation device for water treatment according to claim 1, characterized in that, ​ 5. The sedimentation device for water treatment according to claim 1, characterized in that, ​ 6. The sedimentation device for water treatment according to claim 2, characterized in that, ​ ​ ​

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