Spiral flow guide type sedimentation tank for municipal sewage treatment

Abstract

The application discloses a spiral flow guide type sedimentation tank for municipal sewage treatment, which belongs to the technical field of sewage treatment and comprises a tank body, a stirring assembly and a compression mechanism.The tank body is composed of an upper sedimentation zone, a lower storage zone and a tapered neck section connecting the sedimentation zone and the storage zone.The stirring assembly is arranged in the tank body and can be axially adjusted.The stirring assembly can realize the plugging and partition of the top of the storage zone by relying on the structure thereof.The stirring assembly is axially moved to the storage zone.The stirring side wing is assembled between the tank body and the stirring assembly and has a folding state and an enclosing state.The enclosing state is opened along with the axial movement of the stirring assembly and is attached to the inner wall of the tapered neck section to form an annular enclosing structure, so that a temporary storage zone is formed in the tapered neck section.The compression mechanism is slidably arranged in the tank body.Through the state switching of the stirring side wing, the dynamic cyclone sedimentation, the static depth sedimentation and the integration of the non-stop sewage discharge are realized in the same tank body, so that the problems of the shutdown of the sewage discharge and the secondary suspension of the sediment in the existing sedimentation tank are solved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a spiral-guided sedimentation tank for municipal wastewater treatment. Background Technology

[0002] In municipal wastewater treatment, sedimentation tanks are the core equipment for separating suspended solids from water, and their separation efficiency directly determines the quality and overall efficiency of wastewater treatment. Currently, most existing municipal wastewater treatment sedimentation tanks adopt gravity sedimentation or simple agitation sedimentation modes. They mainly consist of a tank body, an agitation structure, and a discharge structure. Agitation promotes the flocculation of suspended solids in the wastewater, followed by gravity sedimentation separation, and finally, the sediment is discharged through the discharge outlet.

[0003] However, existing sedimentation tanks typically require stopping the inflow and pausing agitation before discharging bottom sediment, allowing the flow within the tank to settle before releasing the sediment. During downtime, the equipment cannot treat wastewater, leading to a decrease in overall treatment capacity, a longer treatment cycle, and increased treatment costs per unit volume, making it difficult to meet the demands of large-volume, continuous municipal wastewater treatment. Some equipment can discharge sewage without shutting down the machine, but due to the lack of a reliable partition structure between the storage area and the settling area, during sewage discharge or filter press operation, the sewage that has not yet settled and the suspended particles it carries are very easy to mix into the storage area and mix with the already deposited sediment, causing the sediment to be resuspended. This not only reduces the sewage discharge effect, but also causes fluctuations in the effluent quality, requiring additional subsequent treatment processes to make up for it, further increasing the overall treatment cost. Summary of the Invention

[0004] The technical solution of this invention is to provide a spiral flow sedimentation tank for municipal sewage treatment. By switching the state of the stirring side wings, dynamic swirling sedimentation, static deep sedimentation and non-stop sewage discharge are integrated and coordinated in the same tank, solving the problems of existing sedimentation tanks requiring shutdown for sewage discharge and secondary suspension of sediment.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a spiral-guided sedimentation tank for municipal wastewater treatment, comprising: The pool consists of an upper settling zone, a lower storage zone, and a conical constricted section connecting the settling zone and the storage zone; A stirring assembly is installed inside the tank and its axial position is adjustable; the stirring assembly moves axially downward to the storage area and can achieve sealing and isolation of the top of the storage area by its own structure. The stirring wing is assembled between the tank body and the stirring assembly, and has a folded state and a barrier state; In the enclosure state, it opens up naturally as the mixing component moves axially, fitting against the inner wall of the conical neck section to form a ring-shaped enclosure structure, thus creating a temporary storage area within the conical neck section. The compression mechanism is slidably installed inside the tank to compress the sediment in the storage area.

[0006] As a further embodiment of the present invention, when the stirring wing is in a folded state, it is circumferentially fixed to the stirring assembly and rotates synchronously with it to expand the stirring area; When the stirring wing is in the enclosure state, it is circumferentially detached from the stirring assembly.

[0007] As a further embodiment of the present invention, the stirring assembly is equipped with a speed regulating mechanism; When the stirring wing is in the folded state, the stirring assembly operates at a low speed; When the stirring side wing is in the enclosure state, the stirring component operates at high speed to compensate for the reduction in water flow speed caused by the reduction in the effective stirring area under the enclosure state, so as to ensure the stability of the sewage flow field and maintain the normal settling effect of the sediment.

[0008] As a further embodiment of the present invention, the speed regulating mechanism includes a drive motor, the output shaft of the drive motor is provided with synchronously rotating drive wheels, there are no less than two pairs of drive wheels, and the diameters of the drive wheels increase sequentially from top to bottom, each drive wheel meshes with a driven wheel, and the diameters of the driven wheels decrease sequentially from top to bottom; The switching component is used to switch the stirring component to rotate synchronously with different driven wheels.

[0009] As a further aspect of the present invention, the switching component includes: A switching part is circumferentially fixed to the stirring assembly, and the switching part is radially slidably disposed with respect to the stirring assembly, and the two are elastically slidable through an elastic element; A drive groove is provided on the inner wall of the driven wheel and extends axially, and a guide slope is provided on the adjacent drive groove; The switching part is axially slidably disposed on one of the drive slots on its outer side, and different drive slots are switched by a guide slope.

[0010] As a further aspect of the present invention, the stirring side wing includes a plurality of sliding sleeves and an auxiliary impeller; The sliding sleeves are annular sleeves with gradually changing diameters, and the sliding sleeves are axially slidingly fitted and can rotate synchronously. The outer sliding sleeve is rotatably assembled with the pool body via a bracket; The inner sliding sleeve moves axially synchronously with the stirring assembly, and can switch between two states: circumferentially fixed with the stirring assembly and relative rotation. Each sleeve is fixedly equipped with several auxiliary impellers at its top.

[0011] As a further embodiment of the present invention, the inner wall and outer wall of the sliding sleeve are respectively provided with a sliding groove and a sliding block, and the sliding block and the sliding groove are axially slidably disposed; The inner wall of the inner sleeve is a sliding groove, and a switching groove communicating with it is provided at the bottom of the sliding groove; The stirring assembly is provided with a drive block that moves synchronously with it. The height of the drive block is adjusted with the stirring assembly to switch between axial sliding in the chute and circumferential sliding in the switching groove.

[0012] As a further embodiment of the present invention, the pool body is equipped with a linear drive mechanism for driving the stirring assembly and the compression mechanism to move axially.

[0013] As a further aspect of the present invention, the stirring assembly includes: The mixing section consists of mixing blades and a sealing plate; The stirring shaft is coaxially fixed to the sealing plate, and the stirring shaft moves axially with the linear drive mechanism.

[0014] As a further embodiment of the present invention, the compression mechanism includes a pressure plate, and a pressure shaft that can move axially with the linear drive mechanism is coaxially fixed on the pressure plate; the pressure plate is provided with a filter screen, and a retaining ring fixed to the pressure plate is provided above the filter screen; one-way flow stop members are provided on both the inner and outer sides of the retaining ring, and the one-way flow stop members are attached to the upper surface of the pressure plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are: In this invention, the stirring wing rotates synchronously with the stirring assembly in the folded state, expanding the stirring area and forming a stable spiral flow field together with the tangential water inlet. Centrifugal force is used to achieve rapid sedimentation of large suspended particles. In the enclosed state, the stirring wing unfolds to form a ring-shaped enclosure structure, creating a temporary storage area. This allows residual fine particles to flocculate and settle in a static environment. At the same time, the stirring assembly forms a sealing barrier on the top of the storage area, making the sewage discharge process independent of the water flow above. This achieves uninterrupted sewage discharge and avoids secondary suspension of sediment, ensuring continuous and stable operation of the equipment and significantly improving the overall efficiency of municipal sewage treatment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the stirring side wing enclosure structure of the present invention. Figure 3 This is a schematic cross-sectional view of the stirring wing in the folded state of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the stirring side wing of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 This is a schematic cross-sectional view of the stirring and compression mechanism of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B; Figure 8 This is a schematic cross-sectional view of the stirring and speed-regulating mechanism of the present invention; Figure 9 For the present invention Figure 8 Enlarged structural diagram at point C; The attached diagram lists the components represented by each number as follows: 1. Tank body; 11. Settling zone; 12. Storage zone; 13. Conical necked section; 14. Temporary storage zone; 2. Agitator assembly; 21. Drive block; 22. Agitator section; 221. Agitator blade; 222. Sealing plate; 23. Agitator shaft; 3. Agitator side wings; 31. Sliding sleeve; 32. Auxiliary impeller; 33. Support; 34. Slide groove; 35. Sliding block; 36. Switching groove; 4. Compression mechanism; 41. Pressure plate; 42. Pressure shaft; 43. Filter screen; 44. Baffle ring; 45. One-way flow stop; 5. Speed ​​control mechanism; 51. Drive motor; 52. Drive wheel; 53. Driven wheel; 6. Switching assembly; 61. Switching section; 62. Elastic element; 63. Drive groove; 64. Guide slope; 7. Linear drive mechanism. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0019] Please see Figures 1-9 The present invention provides a technical solution: a spiral flow sedimentation tank for municipal sewage treatment, comprising: a tank body 1, a stirring assembly 2, stirring side wings 3 and a compression mechanism 4; The pool body 1 consists of an upper settling zone 11, a lower storage zone 12, and a conical constricted section 13 connecting the two; the side wall of the settling zone 11 is provided with an inlet and an outlet, with the inlet arranged along its tangential direction. The stirring component 2 is located inside the tank body 1 and its axial position is adjustable; the stirring component 2 moves axially downward to the storage area 12 and can achieve the sealing and isolation of the top of the storage area 12 by its own structure. The stirring wing 3 is assembled between the tank body 1 and the stirring assembly 2, and has a folded state and a barrier state; In the enclosure state, it opens up as the mixing component 2 moves axially, and forms an annular enclosure structure by fitting the inner wall of the conical neck section 13, thus forming a temporary storage area 14 within the conical neck section 13. The compression mechanism 4 is slidably disposed inside the pool body 1 and is used to compress the sediment in the storage area 12. Specifically, water flows into the settling zone 11 within the tank 1 through the inlet, flowing tangentially along the tank 1 and creating a swirling flow within it. Simultaneously, the stirring assembly 2 rotates, increasing the water flow velocity and creating a stable spiral flow field within the settling zone 11. At this time, the stirring wings 3 are folded, fitting against the outer periphery of the stirring assembly 2 or the area above the conical constriction section 13, without affecting the spiral motion of the water flow. Under the combined action of centrifugal force and gravity, solid particles in the wastewater migrate towards the inner wall of the tank 1 and sink along the inner wall of the conical constriction section 13, falling into the storage zone 12; the central area gradually accumulates into a supernatant, which can be discharged through the outlet as needed. As the process continues, sediment accumulates in storage area 12. When the sediment accumulation reaches a preset threshold, stirring component 2 descends axially, and stirring side wings 3 switch from a folded state to a containment state. Stirring side wings 3 open as stirring component 2 descends, and finally the bottom of stirring side wings 3 adheres to the inner wall of conical neck section 13, forming an annular containment structure, creating a temporary storage area 14 within conical neck section 13. At the same time, stirring component 2 descends to the top of storage area 12, and its structure seals off the top of storage area 12, effectively isolating storage area 12 from the temporary storage area 14 above. After the enclosure is established, the stirring component 2 continues to rotate to maintain the swirling force of the water flow in the settling zone 11 and ensure the stability of the flow field; while in the temporary storage zone 14, due to the obstruction of the annular enclosure, the flow velocity is greatly reduced and tends to be static, and the fine suspended particles remaining in the influent further flocculate and settle here. At the same time, the compression mechanism 4 is activated, and the pressure plate 41 moves downward into the storage area 12 to squeeze the sediment in the isolated storage area 12, thus accelerating the discharge of the sediment. After the sewage discharge is completed, the compression mechanism 4 is reset first; then the stirring component 2 moves upward, causing the stirring side wings 3 to retract and detach from the inner wall of the conical neck section 13, the annular enclosure is released, the temporary storage area 14 disappears, and the stirring side wings 3 return to the folded state; all components return to their initial positions, and the equipment enters the next processing cycle.

[0020] In this invention, the stirring wing 3 rotates synchronously with the stirring assembly 2 in the folded state, expanding the stirring area and forming a stable spiral flow field together with the tangential water inlet, using centrifugal force to achieve rapid sedimentation of large suspended particles; when the stirring wing 3 is in the enclosure state, it unfolds to form an annular enclosure structure, enclosing a temporary storage area 14, allowing residual fine particles to flocculate and settle in a static environment. At the same time, the stirring assembly 2 forms a sealing barrier on the top of the storage area 12, making the sewage discharge process independent of the water flow above, achieving uninterrupted sewage discharge, ensuring continuous operation of the equipment, and significantly improving the overall efficiency of municipal sewage treatment.

[0021] As a further embodiment of the present invention, when the stirring side wing 3 is in a folded state, it is circumferentially fixed with the stirring assembly 2 and rotates synchronously with it to expand the stirring area and ensure that the spiral flow field is evenly distributed in the settling zone 11. When the stirring side wing 3 is in the enclosure state, it is detached from the stirring component 2 and circumferentially fixed, so that the stirring side wing 3 stops rotating and ensures the static settling environment of the sediment in the temporary storage area 14.

[0022] As a further embodiment of the present invention, the stirring assembly 2 is equipped with a speed regulating mechanism 5; When the stirring side wing 3 is in the folded state, the stirring component 2 runs at a low speed; under the premise of ensuring that the sewage is fully flocculated and a stable spiral flow field is formed, the flocs are not broken and the suspended solids are difficult to settle due to excessive speed. When the mixing wing 3 is in the enclosure state, the mixing component 2 operates at high speed to compensate for the reduction in water flow speed caused by the reduction in the effective mixing area under the enclosure state. This ensures that the settling zone 11 still maintains sufficient water flow circulation intensity and tangential velocity, ensuring a stable and continuous sewage flow field. It also prevents the settling efficiency from decreasing due to insufficient flow velocity, maintaining a normal and efficient settling effect for the sediment. At the same time, without opening the mixing wing 3 or disrupting the upper settling conditions, it achieves dynamic isolation between the storage zone 12 and the settling zone 11, allowing the equipment to complete sewage discharge and sludge pressing operations in a continuous operating state, significantly improving the operational continuity and treatment efficiency of the municipal sewage treatment system.

[0023] As a further embodiment of the present invention, the speed regulating mechanism 5 includes a drive motor 51, and the output shaft of the drive motor 51 is provided with synchronously rotating drive wheels 52. There are no less than two pairs of drive wheels 52, and their diameters increase sequentially from top to bottom. Each drive wheel 52 is engaged with a driven wheel 53, and the diameters of the driven wheels 53 decrease sequentially from top to bottom. Switching component 6 is used to switch the stirring component 2 to rotate synchronously with different driven wheels 53; Specifically, the drive motor 51 drives each drive wheel 52 to rotate synchronously. By utilizing the meshing ratio of the progressively increasing diameter of the upper and lower sets of drive wheels 52 and the progressively decreasing diameter of the corresponding driven wheels 53, multiple power output gears with different transmission ratios are formed. Through the switching component 6, the stirring component 2 can switch power connection with the driven wheels 53 at different positions, thereby changing the input transmission ratio of the stirring component 2 and realizing the smooth switching and adjustment of high and low speed gears.

[0024] When the mixing side wing 3 is in the folded working condition, the switching component 6 is connected to the high transmission ratio gear, so that the mixing component 2 can obtain low speed output to match the working requirements of the large area mixing area. The low-speed and stable mixing forms a regular spiral flow field, which can not only ensure the sewage flocculation and mixing effect, but also avoid disturbing the water body and breaking the flocs due to excessive speed, thus reducing operating noise and energy consumption. When the stirring side wing 3 moves axially downward with the stirring component 2 to enter the enclosure working condition, the switching component 6 switches to the small transmission ratio gear, so that the stirring component 2 switches to high speed operation, thereby compensating for the overall water flow speed reduction caused by the reduction of the effective stirring area under the enclosure state, and maintaining the stability of the flow field circulation in the pool. This solution adopts a graded speed change structure with multiple sets of large and small gears meshing together, and with the switching component 6, it realizes mechanical gear speed regulation, which can match the different speed requirements of two working conditions: stirring state and enclosure state. It is fully adaptable to the working logic of continuous sewage treatment and non-stop isolation sewage discharge in the sedimentation tank.

[0025] As a further aspect of the present invention, the switching component 6 includes: The switching part 61 is circumferentially fixed to the stirring assembly 2, and the switching part 61 is radially slidably disposed with the stirring assembly 2, and the two are elastically slidable through the elastic member 62. A drive groove 63 is provided on the inner wall of the driven wheel 53 and extends axially, and a guide slope 64 is provided on the adjacent drive groove 63. The switching part 61 is axially slidably disposed on one of the drive slots 63 on its outer side, and different drive slots 63 are switched by the guide slope 64; Specifically, when the stirring wing 3 is in the folded state, the switching part 61 is pushed out radially outward under the elastic force of the elastic member 62, and engages with the drive groove 63 of the driven wheel 53 of the corresponding low speed gear. Since the switching part 61 is circumferentially fixed to the stirring assembly 2, when the driven wheel 53 rotates, it drives the switching part 61 to rotate synchronously through the drive groove 63, thereby driving the stirring assembly 2 to run stably at low speed. As the stirring assembly 2 descends axially, it drives the switching part 61 to move axially synchronously. When the outer end of the switching part 61 contacts the guide slope 64 at the end of the current drive groove 63, the switching part 61, guided by the guide slope 64, overcomes the elastic force of the elastic element 62 and retracts radially inward along the stirring assembly 2, gradually disengaging from the current drive groove 63. When the stirring assembly 2 descends to the designated position, the switching part 61 moves axially with the stirring assembly 2 to the drive groove 63 position of the corresponding high-speed gear driven wheel 53. At this time, the elastic element 62 resets, pushing the switching part 61 radially outward and re-engaging it into the drive groove 63 of that gear, thus realizing the power connection between the switching part 61 and the driven wheel 53 of that gear. At this time, the power of the speed regulating mechanism 5 is transmitted to the switching part 61 through the driven wheel 53 and drive groove 63 of that gear, thereby adjusting the speed.

[0026] As a further embodiment of the present invention, the stirring side wing 3 includes a plurality of sliding sleeves 31 and an auxiliary impeller 32; Several sliding sleeves 31 are annular sleeves with gradually changing diameters, and each sliding sleeve 31 is axially slidingly fitted and can rotate synchronously. The outer sliding sleeve 31 is rotatably assembled with the pool body 1 via the bracket 33; The inner sliding sleeve 31 moves axially synchronously with the stirring assembly 2, and can switch between two states: circumferentially fixed with the stirring assembly 2 and relative rotation. Each sliding sleeve 31 is fixedly equipped with several auxiliary impellers 32 at its top; Specifically, when the stirring assembly 2 is in the axial high position, the stirring side wing 3 is in a folded state. At this time, the inner sliding sleeve 31 is circumferentially fixed to the stirring assembly 2. Since the sliding sleeves 31 are axially slidingly engaged and can rotate synchronously, when the inner sliding sleeve 31 rotates synchronously with the stirring assembly 2, it will drive all the sliding sleeves 31 to rotate together, thereby driving the auxiliary impeller 32 at the top of each sliding sleeve 31 to rotate synchronously. This greatly expands the stirring area, adapts to the large-area stirring requirements of the settling zone 11, and, in conjunction with the low-speed operation of the stirring assembly 2, forms a stable and uniform spiral flow field in the settling zone 11, promoting the full mixing of sewage and flocculant, and accelerating the formation and settling of flocs. The outer sliding sleeve 31 is rotatably assembled with the tank body 1 through the bracket 33, which provides stable support for the entire stirring side wing 3 without affecting the rotation of the sliding sleeve 31. When the stirring assembly 2 is in the axial low position, the stirring side wing 3 is in the enclosure state, and the inner sliding sleeve 31 rotates relative to the stirring assembly 2, reducing the disturbance of the stirring side wing 3 to the sediment in the temporary storage area 14.

[0027] As a further embodiment of the present invention, the inner wall and outer wall of the sliding sleeve 31 are respectively provided with a sliding groove 34 and a slider 35, and the slider 35 and the sliding groove 34 are axially slidably arranged. The inner wall of the inner sliding sleeve 31 is a sliding groove 34, and the bottom of the sliding groove 34 is provided with a switching groove 36 that communicates with it; The stirring assembly 2 is provided with a drive block 21 that moves synchronously with it. The height of the drive block 21 is adjusted with the stirring assembly 2 to switch between axial sliding in the slide 34 and circumferential sliding in the switching groove 36. When the stirring assembly 2 moves axially downward, the sliding sleeve 31 moves synchronously axially under the action of gravity until the slider 35 on the side of the adjacent sliding sleeve 31 slides to the limit of the corresponding sliding groove 34. The sliding sleeves 31 stop descending sequentially from the outside to the inside until the innermost sliding sleeve 31 stops descending. The driving block 21 on the outside of the stirring assembly 2 moves from the sliding groove 34 to the switching groove 36. The inner sliding sleeve 31 is released from circumferential fixation with the stirring assembly 2 and switches to a relative rotation state.

[0028] As a further embodiment of the present invention, a linear drive mechanism 7 for driving the stirring assembly 2 and the compression mechanism 4 to move axially is installed on the tank body 1. In this embodiment, the linear drive mechanism 7 adopts two sets of electric telescopic rods. The fixed end of the first set of electric telescopic rods is installed on the top of the tank body 1, and the output end is rotatably set with the stirring assembly 2 through the frame. The fixed end of the second set of electric telescopic rods moves synchronously with the output end of the first set of electric telescopic rods, and the movable end of the second set of electric telescopic rods is connected to the compression mechanism 4. In the first stage, the first set of electric telescopic rods retracts, driving the stirring assembly 2 to descend. After the stirring assembly 2 seals the top of the storage area 12, the second set of electric telescopic rods drives the compression mechanism 4 to descend and compress the sediment.

[0029] As a further aspect of the present invention, the stirring assembly 2 includes: The stirring section 22 consists of stirring blades 221 and sealing plate 222; The stirring shaft 23 is coaxially fixed on the sealing plate 222, and the stirring shaft 23 moves axially with the linear drive mechanism 7. As a further embodiment of the present invention, the compression mechanism 4 includes a pressure plate 41, and a pressure shaft 42 that can move axially with the linear drive mechanism 7 is coaxially fixed on the pressure plate 41; the pressure plate 41 is provided with a filter screen 43, and a retaining ring 44 fixed to the pressure plate 41 is provided above the filter screen 43; one-way flow stop members 45 are provided on both the inner and outer sides of the retaining ring 44, and the one-way flow stop members 45 are attached to the upper surface of the pressure plate 41. Specifically, The pressure plate 41 descends into the storage area 12, squeezing the sediment in the isolated storage area 12; water flows upward through the filter screen 43 and towards the one-way flow stop 45, creating a gap between the one-way flow stop 45 and the pressure plate 41. The water flows from the gap to the top of the pressure plate 41. When the pressure plate 41 moves upward, the one-way flow stop 45 adheres to the upper surface of the pressure plate 41, preventing the discharged water from flowing back into the storage area 12, thus achieving pressure filtration and dewatering of the sediment.

Claims

1. A spiral-flow sedimentation tank for municipal wastewater treatment, characterized in that, include: The pool body (1) consists of an upper settling zone (11), a lower storage zone (12), and a conical constricted section (13) connecting the settling zone and the storage zone; A stirring assembly (2) is installed inside the tank (1) and its axial position is adjustable. The stirring assembly (2) includes a stirring part (22) and a stirring shaft (23). The stirring part (22) includes a stirring blade (221) and a sealing plate (222) coaxially fixed with the stirring shaft (23). The stirring assembly (2) moves axially downward to the storage area (12) and can achieve the sealing and isolation of the top of the storage area (12) by relying on the sealing plate (222). The stirring wing (3) is assembled between the tank body (1) and the stirring assembly (2), and has a folded state and a barrier state; The stirring side wing (3) includes several sliding sleeves (31) and auxiliary impellers (32); The sliding sleeves (31) are annular sleeves with gradually changing diameters, and the sliding sleeves (31) are axially slidingly fitted and can rotate synchronously. The outer sliding sleeve (31) is rotatably assembled with the pool body (1) via a bracket (33); The inner sliding sleeve (31) moves axially synchronously with the stirring assembly (2), and can switch between two states: circumferentially fixed with the stirring assembly (2) and relative rotation. Each sleeve (31) has several auxiliary impellers (32) fixedly mounted on its top. The inner and outer walls of the sliding sleeve (31) are respectively provided with a sliding groove (34) and a sliding block (35), and the sliding block (35) and the sliding groove (34) are axially slidable. The bottom of the inner slide (34) is provided with a switching groove (36) that communicates with it; The stirring assembly (2) is provided with a driving block (21) that moves synchronously with it. The height of the driving block (21) is adjusted with the stirring assembly (2) to switch between axial sliding in the chute (34) and circumferential sliding in the switching groove (36). In the enclosure state, the stirring side wings (3) open out in the direction of the stirring assembly (2) as the stirring assembly (2) moves axially, and form an annular enclosure structure by fitting the inner wall of the conical neck section (13), and a temporary storage area (14) is formed inside the conical neck section (13); the drive block (21) enters the switching slot (36), and the stirring side wings (3) are separated from the stirring assembly (2) and fixed in the circumferential direction; In the folded state, the drive block (21) enters the chute (34), and the stirring side wing (3) is circumferentially fixed to the stirring assembly (2) and rotates synchronously with it; The compression mechanism (4) is slidably installed in the pool body (1) to compress the sediment in the storage area (12).

2. The spiral-guided sedimentation tank for municipal wastewater treatment according to claim 1, characterized in that, The stirring assembly (2) is equipped with a speed regulating mechanism (5); When the stirring wing (3) is in a folded state, the stirring assembly (2) operates at a low speed; When the stirring wing (3) is in the enclosure state, the stirring assembly (2) runs at high speed to compensate for the reduction in water flow speed caused by the reduction in the effective stirring area under the enclosure state, so as to ensure the stability of the sewage flow field and maintain the normal settling effect of the sediment.

3. The spiral-guided sedimentation tank for municipal wastewater treatment according to claim 2, characterized in that, The speed regulating mechanism (5) includes a drive motor (51), the output shaft of the drive motor (51) is provided with synchronously rotating drive wheels (52), the drive wheels (52) are not less than two pairs, and the diameter increases from top to bottom, each drive wheel (52) is engaged with a driven wheel (53), the diameter of the driven wheel (53) decreases from top to bottom; The switching component (6) is used to switch the stirring component (2) to rotate synchronously with different driven wheels (53).

4. The spiral-guided sedimentation tank for municipal wastewater treatment according to claim 3, characterized in that, The switching component (6) includes: A switching part (61) is circumferentially fixed to the stirring assembly (2), and the switching part (61) is radially slidably disposed with the stirring assembly (2), and the two are elastically slidably connected by an elastic member (62); A drive groove (63) is provided on the inner wall of the driven wheel (53) and extends axially, and a guide slope (64) is provided on the adjacent drive groove (63). The switching part (61) is axially slidably disposed on one of the drive slots (63) on the outside, and different drive slots (63) are switched by the guide slope (64).

5. The spiral-guided sedimentation tank for municipal wastewater treatment according to claim 1, characterized in that, The pool body (1) is equipped with a linear drive mechanism (7) for driving the stirring shaft (23) and the compression mechanism (4) to move axially.

6. The spiral-guided sedimentation tank for municipal wastewater treatment according to claim 5, characterized in that, The compression mechanism (4) includes a pressure plate (41), and the pressure plate (41) is coaxially fixed with a pressure shaft (42) that can move axially with the linear drive mechanism (7); the pressure plate (41) is provided with a filter screen (43), and a retaining ring (44) fixed to the pressure plate (41) is provided above the filter screen (43); the retaining ring (44) is provided with one-way flow stop (45) on both the inner and outer sides, and the one-way flow stop (45) is attached to the upper surface of the pressure plate (41).

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