A multi-layered folding impeller with a virtual guide flow pattern

Abstract

The present application relates to water treatment stirring equipment technical field, and disclose a kind of multi-layer folding vane impeller with virtual flow guiding flow state, including front circular plate and rotating assembly in the center position of front circular plate stirring shaft, the rod body outside of stirring shaft departing from front circular plate is equipped with two groups of horizontally opposite stirring vane pieces, two groups of the stirring vane piece are commonly connected with sleeve, the stirring vane piece is fixedly connected in the outside wall of stirring shaft by sleeve;The side wall of the stirring vane piece is integrally formed with side four folding plate, the plate surface of the stirring vane piece perpendicular to side four folding plate is integrally formed with side two folding plate.In the present application, all impeller blade inclination, orientation remains uniform, when running, multi-layer blade synchronous same direction push water body, form continuous regular axial main flow in pool body center, water body is down to pool bottom and then diffuses and washes pool wall to all around, again along pool wall uplink, build global closed circulation flow field.

Description

Technical Field

[0001] This invention relates to the field of water treatment mixing equipment technology, specifically to a multi-layered folding blade mixing impeller with a virtual flow guiding state. Background Technology

[0002] In coagulation and flocculation water treatment processes for tap water and sewage, mechanical stirring is required to achieve rapid mixing of reagents and water, and to promote the collision and aggregation of colloidal particles to form dense flocs. For vertical reactors with a high aspect ratio and a depth much greater than their width, the mainstream stirring schemes are currently divided into three categories: Single-layer impellers have a simple structure, but their effective mixing height is limited. In deep pools, they cannot drive full-height water circulation, resulting in significant flow differences between the upper, middle, and bottom parts of the pool. Agitators with solid guide tubes, by adding a fixed guide tube to the outside of the impeller, force axial circulation of the water, which improves the flow field stratification problem in deep pools to some extent. However, the solid guide tube occupies effective space within the pool, and the narrow flow channels are easily blocked by flocs and impurities adhering to the walls. Traditional multi-layer impellers add multiple impellers according to water depth to expand the mixing coverage, but these impellers use conventional blade shapes and do not perform geometric optimization for axial flow guidance. Therefore, this invention proposes a multi-layer folded-blade impeller with virtual flow guidance capabilities. Summary of the Invention

[0003] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a multi-layered folded-blade agitator impeller with virtual flow guidance, which solves the problem that existing agitator impellers rely solely on external flow guidance components to achieve directional flow, without constructing a flow guidance effect through the impeller's own geometric shape.

[0004] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a multi-layered folded-blade agitator impeller with a virtual flow guiding state, comprising a front circular plate and an agitator shaft rotatably mounted at the center of the front circular plate. Two sets of horizontally opposite agitator blades are sleeved on the outer side of the agitator shaft away from the front circular plate. A kit connects the two sets of agitator blades, and the agitator blades are fixedly connected to the outer wall of the agitator shaft via the kit. A four-fold side plate is integrally formed on the side wall of each agitator blade, and a two-fold side plate is integrally formed on the surface of each agitator blade perpendicular to the four-fold side plate. A linkage cavity is fixedly mounted on the side of the front circular plate away from the agitator shaft. A coupling mechanism is fixedly mounted on the side of the linkage cavity away from the front circular plate.

[0005] Preferably, a fixing member is fixedly connected to the side wall of the kit that connects the two sets of stirring blades, and the fixing member is fixedly sleeved on the outer wall of the stirring shaft.

[0006] Preferably, a limiting member is fixedly sleeved on the side end wall of the stirring shaft away from the front circular plate, and a second insert is integrally formed at the center of the limiting member. One side end wall of the second insert extends into the stirring shaft and is fixedly connected to it.

[0007] Preferably, the stirring shaft is perpendicularly inserted through the outer side of the rod body of the front circular plate, and a central shaft is sleeved thereon. The stirring shaft is rotatably connected to the center position of the central shaft.

[0008] Preferably, the central shaft is fixedly installed through the center of the front circular plate, and four sets of inserts are integrally formed on the outer side wall of the central shaft along its circumference. The front circular plate is integrally formed with a locking block at the position corresponding to the inserts, and the bottom of the insert is detachably embedded in the locking block.

[0009] Preferably, the front circular plate has an integrally formed inner ring on the side facing the linkage cavity, and the inner ring extends into the linkage cavity and is detachably connected to it.

[0010] Preferably, a linkage shaft is rotatably arranged at the center position inside the linkage cavity, and five sets of built-in blades are fixedly connected to the outer side wall of the linkage shaft along its circumference, with the outer side wall of the built-in blades and the inner wall of the linkage cavity having a clearance fit.

[0011] Preferably, a plug-in is integrally formed on one end wall of the stirring shaft extending to the linkage cavity, and the plug-in is integrally inserted into the linkage shaft.

[0012] Preferably, the coupling mechanism is rotatably fitted with a drive plug on one side facing the linkage cavity, and one end wall of the drive plug extends into the linkage cavity and is fixedly inserted into the linkage shaft.

[0013] Preferably, a drive motor is fixedly connected to the side of the coupling mechanism away from the linkage cavity, and the drive motor is used to drive the entire set of equipment to operate.

[0014] In summary, the technical effects and advantages of this invention are as follows: In this invention, the entire impeller consists of two sets of parallel opposing folded blade structures. The blades adopt an integrated irregular bending design. The sidewalls of both sets of blades are integrally formed with a four-fold structure. The upper end face of one set of blades is integrally formed with a two-fold structure, and the lower end face of the other set of blades is integrally formed with a two-fold structure. With the blade width, tilt angle, and end profile optimized in coordination, the two sets of blades form a special curved surface shape that can spontaneously gather water flow, which is also the core foundation for realizing tubeless virtual flow guidance.

[0015] The equipment's power is transmitted to the stirring shaft via a vertically arranged drive structure. The stirring shaft can be equipped with multi-layer impeller assemblies along the axial direction as needed, adapting to water treatment reaction tanks of different depths and aspect ratios. All impeller blades maintain a uniform inclination angle and orientation. During operation, the multi-layer blades synchronously and in the same direction push the water, forming a continuous and regular axial mainstream at the center of the tank. After the water flows down to the bottom of the tank, it spreads outwards to wash the tank walls, and then flows back up along the tank walls, constructing a closed-loop circulation field throughout the entire area. This effectively improves problems such as water stratification, bottom sludge accumulation, and dead zones in deep water tanks, ensuring uniform mixing of reagents and synchronous floc growth.

[0016] The integrated bending design of the blades, combined with a smooth transition structure at the ends, effectively reduces local shear forces at the blade edges. While maintaining high-flow circulation and forming a stable virtual flow pattern, it avoids breaking down fragile flocs and stabilizing the effluent quality. The multi-layer impeller is flexibly arranged according to water depth, with no opposing disturbances in the flow field between layers, resulting in higher power utilization and lower overall energy consumption. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a multi-layered folded blade stirring impeller with virtual flow guidance according to the present invention; Figure 2 This is a schematic diagram of the overall structure of the stirring shaft and stirring blades of the present invention; Figure 3 This is a schematic diagram of the overall structure of the stirring blade of the present invention; Figure 4 This is a schematic diagram of the overall structure of the linkage cavity, front circular plate, stirring shaft, central shaft, built-in blade, coupling mechanism and drive motor of the present invention. Figure 5 This is an exploded view of the overall structure of the linkage cavity, front circular plate, stirring shaft, central shaft, built-in blades, coupling mechanism and drive motor of the present invention. Figure 6 This is a schematic diagram of the overall structure of the front circular plate, central shaft, and built-in blade of the present invention.

[0018] In the diagram: 1. Linkage chamber; 2. Front circular plate; 201. Locking block; 202. Internal ring; 3. Stirring shaft; 301. Insert 1; 302. Limiting component; 303. Insert 2; 4. Stirring blade; 401. Side four-fold plate; 402. Side two-fold plate; 403. Fixing component; 5. Central shaft; 501. Insert block; 6. Internal blade; 601. Linkage shaft; 7. Coupling mechanism; 701. Drive insert; 8. Drive motor. Detailed Implementation

[0019] 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.

[0020] refer to Figures 1-6 The multi-layered folding blade impeller with virtual flow guidance shown includes a front circular plate 2 and a stirring shaft 3 rotatably mounted at the center of the front circular plate 2. A specific embodiment is shown below: Example 1: Double-layer folding blade agitator impeller (suitable for medium-depth rectangular coagulation tank) This embodiment is applied to a rectangular coagulation reactor with a high aspect ratio. The reactor is 2.7m long, 3.075m wide, and has an effective water depth of 6.95m.

[0021] The complete stirring device includes a drive motor 8, a coupling mechanism 7, a linkage chamber 1, a front circular plate 2, a central shaft 5, a stirring shaft 3, and two layers of impeller assemblies. The stirring shaft 3 is vertically and centrally located inside the tank. The drive motor 8 is fixedly mounted on the side of the coupling mechanism 7 away from the linkage chamber 1. The power output from the drive motor 8 is transmitted to the linkage shaft 601 inside the linkage chamber 1 via the drive plug 701 inside the coupling mechanism 7. The linkage shaft 601 is connected and fixed to the upper end of the stirring shaft 3 via plug 301, thereby transmitting stable rotational power to the stirring shaft 3. The entire transmission structure works together to ensure continuous and uninterrupted power transmission.

[0022] The impeller outer diameter is 1.10m, the axial distance between the centers of two adjacent impeller layers is 1.32m, the ratio of the layer spacing to the impeller outer diameter is 1.2, which is within the standard arrangement range of 1.0D to 1.5D; the vertical distance between the center of the bottom impeller and the bottom of the pool is 0.90m, and the ratio of the height above the ground to the impeller outer diameter is 0.82. This height setting can ensure that the water flow pumped downward by the impeller can fully flush the bottom area of ​​the pool, meeting the design requirements for flushing the bottom of the pool and preventing sludge accumulation.

[0023] The entire device consists of two layers of impeller assemblies. Each impeller layer is equipped with two sets of half-hub components. The side walls of the components are fixedly connected to fasteners 403, which lock the entire impeller assembly to the outer wall of the stirring shaft 3. Each impeller layer is equipped with two symmetrically arranged stirring blades 4. The side walls of the stirring blades 4 are integrally formed with four-fold plates 401. The stirring blades 4 are integrally formed with two-fold plates 402 perpendicular to the four-fold plates 401. The outer ends of the blades are provided with arc-shaped transition structures. The bending angles and assembly orientations of the upper and lower stirring blades 4 are completely uniform. During rotation, the discharge flow direction remains consistent, and there is no problem of flow field collision or mutual interference.

[0024] The center of the front circular plate 2 is fixedly connected to the central shaft 5. The stirring shaft 3 is rotatably assembled at the center of the central shaft 5. Four sets of inserts 501 are integrally formed along the circumferential direction on the outer wall of the central shaft 5. The front circular plate 2 is integrally formed with a locking block 201 corresponding to the position of the inserts 501. The bottom of the inserts 501 is detachably embedded in the locking block 201 to achieve stable assembly of the central shaft 5 and the front circular plate 2. An inner ring 202 is integrally formed on the side of the front circular plate 2 facing the linkage cavity 1. The inner ring 202 extends into the linkage cavity 1 and is detachably connected to it to achieve quick assembly of the front circular plate 2 and the upper transmission cavity. A limiting member 302 is fixedly sleeved on the outer wall of the shaft end of the stirring shaft 3 away from the front circular plate 2. An insert 303 is integrally formed at the center of the limiting member 302. One end of the insert 303 extends into the stirring shaft 3 and is fixedly connected to it, which plays an axial limiting role for the bottom impeller and prevents the impeller from sliding down axially.

[0025] During on-site installation, the stirring shaft 3 is vertically fixed to the center of the tank. Two layers of impeller assemblies are then assembled sequentially from bottom to top. The fasteners on the outer fixing parts 403 of the locking assembly are tightened to complete the impeller positioning. The equipment operating speed is controlled at 8–12 r / min. The stirring shaft 3 drives the double-layer stirring blades 4 to rotate synchronously. Relying on the integrated bending special geometry of the stirring blades 4, a stable virtual flocculation flow pattern can be formed in the tank without the need for an additional physical guide tube. The water flows directionally downwards along the central axis, and after reaching the bottom of the tank, it spreads evenly in all directions, continuously flushing the bottom and walls of the tank, thoroughly eliminating bottom sludge and localized stagnant dead zones. The arc-shaped transition structure at the outer end of the stirring blades 4 effectively disperses the high-speed water flow at the blade tip, reducing the shear force at the blade tip. The flocculated flocs are intact and not easily broken, ensuring uniform mixing of the chemicals and water in the tank, and maintaining stable effluent quality over a long period. During later maintenance, the single-layer stirring blade 4 and half-fan hub can be removed by simply loosening the fasteners of the corresponding impeller assembly outer fixing part 403. There is no need to disassemble the stirring shaft 3, central shaft 5, linkage chamber 1 and drive motor 8, making the maintenance operation simple and convenient, and greatly shortening the equipment downtime.

[0026] Example 2: Three-layer folded blade agitator impeller (suitable for deep circular flocculation reaction tank) This embodiment is applied to a deep circular reaction tank with an inner diameter of 3.0m and an effective water depth of 9.0m.

[0027] The entire transmission structure consists of a drive motor 8, a coupling mechanism 7, a linkage chamber 1, a front circular plate 2, a central shaft 5, a stirring shaft 3, and a three-layer impeller assembly. The stirring shaft 3 is vertically arranged along the central axis of the circular tank. The power output from the drive motor 8 is transmitted to the linkage chamber 1 through the drive insert 701 inside the coupling mechanism 7. The linkage shaft 601 is rotated in the center of the linkage chamber 1. Five sets of built-in blades 6 are fixedly connected to the outer wall of the linkage shaft 601 circumferentially. The outer wall of the built-in blades 6 is clearance-fitted with the inner wall of the linkage chamber 1. The linkage shaft 601 drives the five sets of built-in blades 6 to rotate, preventing impurities from entering the linkage chamber 1 and interfering with the rotation of the coupling assembly. The linkage shaft 601 is fixed to the upper end of the stirring shaft 3 by inserting insert 301, and the power is smoothly transmitted to the stirring shaft 3 through the linkage shaft 601.

[0028] The impeller outer diameter is set at 1.20m, the center-to-center distance between adjacent impellers is 1.4m, and the ratio of the layer spacing to the impeller outer diameter is 1.17, strictly conforming to the design rule of arranging one layer of impellers every 1 to 1.5 times the impeller diameter; the center of the bottom impeller is 0.96m above the bottom of the pool, and the ratio of the height above the ground to the impeller outer diameter is 0.8. The water flow delivered downward by the bottom impeller can thoroughly clean the sediment at the bottom of the pool, avoiding long-term accumulation of silt.

[0029] This embodiment is configured with a three-layer impeller assembly. Each layer consists of two sets of half-hub units joined together to form a kit. The side wall of the kit is fixedly connected to the fastener 403 and locked to the outer wall of the stirring shaft 3 by the fastener 403. Each layer is equipped with two symmetrically arranged stirring blades 4. The side wall of the stirring blade 4 is integrally formed with a four-fold plate 401, and the stirring blade 4 is integrally formed with a two-fold plate 402 perpendicular to the position of the four-fold plate 401. The outer edge of the stirring blade 4 is provided with an arc transition structure. All stirring blades 4 in the three layers have the same bending angle and installation orientation. When the equipment is running, the water is pumped synchronously and in the same direction. The superposition of multiple water flows forms a continuous and stable central mainstream.

[0030] The center of the front circular plate 2 is fixedly connected to the central shaft 5. The stirring shaft 3 is rotatably fitted inside the central shaft 5. The outer insert 501 of the central shaft 5 is fitted with the surface clip 201 of the front circular plate 2. The inner ring 202 above the front circular plate 2 extends into the linkage cavity 1 to complete the detachable assembly. The bottom outer wall of the stirring shaft 3 is fitted with a limiting member 302. The inner insert 303 of the limiting member 302 is fixedly connected to the stirring shaft 3 to limit the axial displacement of the bottom impeller and ensure the stability of the multi-layer impeller assembly position.

[0031] During operation, the three layers of agitator blades 4 work together to create a continuous virtual flow field throughout the entire pool, thanks to the blades' unique bending geometry. This results in a complete closed-loop circulation of water, ensuring uniform flow velocity throughout the 9m deep pool and eliminating water stratification and dead zones. The agitator blades 4, combined with their end-arc buffer structures, mitigate the localized high-speed jets at the blade tips, stabilizing the flow field G-value within the appropriate range for flocculation. This ensures sufficient collision and aggregation of colloidal particles in the water, forming dense and complete flocs, resulting in significant coagulation and flocculation effects. The three impellers flow out in the same direction, with each layer's flow field overlapping in the same direction without any opposing interference, leading to higher power utilization, lower overall power loss, and lower operating energy consumption. Each impeller layer has an independent clamping assembly structure; when a single impeller is worn or damaged, only the corresponding layer's fixing component 403 needs to be removed for individual impeller replacement, without disassembling the entire agitator shaft 3 and the upper transmission mechanism. This significantly reduces downtime for maintenance and is suitable for long-term continuous operation in water supply and wastewater treatment plants.

[0032] Working principle of this invention: This device relies on a drive motor 8 to provide rotational power. The power is transmitted to the linkage chamber 1 via the drive insert 701 in the coupling mechanism 7. The linkage shaft 601 inside the linkage chamber 1 rotates synchronously with the drive insert 701. The linkage shaft 601 is fixed to the upper end of the stirring shaft 3 by insert 301, thereby driving the stirring shaft 3 to rotate as a whole. Multiple sets of built-in blades 6 arranged on the outer periphery of the linkage shaft 601 can agitate the medium inside the chamber, reducing the wear of the transmission structure caused by impurity deposition. The stirring shaft 3 is rotatably assembled in the central shaft 5 that passes through the front circular plate 2. The central shaft 5 is positioned by the insertion block 501 and the locking block 201 of the front circular plate 2. The front circular plate 2 is detachably assembled to the linkage chamber 1 by the built-in ring 202, realizing stable support for the upper transmission structure.

[0033] The stirring shaft 3 is equipped with a multi-layer impeller assembly along the axial direction. Each impeller layer consists of a two-half hub assembly and two symmetrical stirring blades 4. The assembly is locked to the outer wall of the stirring shaft 3 by a fastener 403. The stirring blades 4 are integrally formed with a four-fold side plate 401 and a two-fold side plate 402, which, together with the end arc structure, form a unique folded blade shape. All layers of stirring blades 4 have the same inclination angle and orientation, and push water in the same direction when rotating. The limiting piece 302 at the bottom of the stirring shaft is fixed to the shaft body by means of the second insert 303, which forms an axial limit for the bottom impeller and prevents the impeller from slipping or misaligning.

[0034] When the equipment is in operation, the multi-layered mixing blades 4 pump water synchronously and in the same direction. Relying on the special bending geometry of the blades, a stable and continuous virtual axial flow mainstream can be formed in the center of the pool without the need for a physical guide tube. The water flows downward along the central mainstream, and after reaching the bottom of the pool, it spreads evenly to the surrounding areas to flush the pool walls and bottom, eliminating sludge accumulation and dead zones. Then, it flows upward along the pool walls and back into the impeller's range of action, forming a closed-loop water circulation throughout the entire area.

[0035] The rounded transition structure at the outer end of the stirring blade 4 disperses the high-speed jet from the blade tip, reducing local shear force. While ensuring high-flow-rate water circulation, it avoids breaking up flocculated flocs and stabilizes the G-value of the flocculation process. The impellers are arranged in layers with a spacing of 1.0D to 1.5D, driving the water in multiple layers in relay. The flow field in the deep pool is continuous and uninterrupted, completely solving the problem of water stratification.

[0036] During equipment maintenance, the impeller assembly can be disassembled individually by simply loosening the fixing part 403 of the single-layer impeller assembly. There is no need to disassemble the entire transmission components such as the stirring shaft 3, the linkage chamber 1, and the drive motor 8, which greatly reduces the difficulty of operation and maintenance and ensures the continuous and stable operation of the water treatment system.

[0037] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer for control.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-layered folding blade impeller with virtual flow guidance, comprising a front circular plate (2) and a stirring shaft (3) rotatably mounted at the center of the front circular plate (2), characterized in that: Two sets of horizontally opposite stirring blades (4) are sleeved on the outside of the rod body of the stirring shaft (3) away from the front circular plate (2). The two sets of stirring blades (4) are connected by a kit. The stirring blades (4) are fixedly connected to the outer wall of the stirring shaft (3) through the kit. The side wall of the stirring blades (4) is integrally formed with a side four-fold plate (401). The side surface of the stirring blades (4) perpendicular to the side four-fold plate (401) is integrally formed with a side two-fold plate (402). The front circular plate (2) is fixedly equipped with a linkage cavity (1) on the side away from the stirring shaft (3). The linkage cavity (1) is fixedly equipped with a coupling mechanism (7) on the side away from the front circular plate (2).

2. The multi-layered folding blade stirring impeller with virtual flow guidance as described in claim 1, characterized in that: A fixing member (403) is fixedly connected to the side wall of the kit that connects the two sets of stirring blades (4), and the fixing member (403) is fixedly sleeved on the outer wall of the stirring shaft (3).

3. The multi-layered folding blade stirring impeller with virtual flow guidance as described in claim 1, characterized in that: A limiting member (302) is fixedly sleeved on one side end wall away from the front circular plate (2). A plug-in two (303) is integrally formed at the center of the limiting member (302). One side end wall of the plug-in two (303) extends into the stirring shaft (3) and is fixedly connected to it.

4. A multi-layered folding blade stirring impeller with virtual flow guidance as described in claim 1, characterized in that: The stirring shaft (3) is perpendicularly inserted through the outer side of the rod of the front circular plate (2) and fitted with a central shaft (5). The stirring shaft (3) is rotatably connected to the center of the central shaft (5).

5. A multi-layered folding blade stirring impeller with virtual flow guidance as described in claim 4, characterized in that: The central shaft (5) is fixedly installed through the center of the front circular plate (2). The outer side wall of the central shaft (5) is integrally formed with four sets of inserts (501) along its circumference. The front circular plate (2) is integrally formed with a locking block (201) corresponding to the position of the inserts (501). The bottom of the inserts (501) is detachably embedded in the locking block (201).

6. A multi-layered folding blade stirring impeller with virtual flow guidance as described in claim 1, characterized in that: The front circular plate (2) has an integrally formed inner ring (202) on the side facing the linkage cavity (1), and the inner ring (202) extends into the linkage cavity (1) and is detachably connected to it.

7. A multi-layered folding blade stirring impeller with virtual flow guidance as described in claim 1, characterized in that: The linkage cavity (1) is rotatably arranged with a linkage shaft (601) at its center position. Five sets of built-in blades (6) are fixedly connected to the outer side wall of the linkage shaft (601) along its circumference. The outer side wall of the built-in blades (6) is in clearance fit with the inner wall of the linkage cavity (1).

8. A multi-layered folding blade stirring impeller with virtual flow guidance as described in claim 7, characterized in that: The stirring shaft (3) extends to one side end wall of the linkage cavity (1) and is integrally formed with a plug-in (301), which is inserted into the linkage shaft (601).

9. A multi-layered folding blade stirring impeller with virtual flow guidance as described in claim 7, characterized in that: The coupling mechanism (7) is rotatably fitted with a drive plug (701) on one side facing the linkage cavity (1). One end wall of the drive plug (701) extends into the linkage cavity (1) and is fixedly inserted into the linkage shaft (601).

10. A multi-layered folding blade stirring impeller with virtual flow guidance as described in claim 1, characterized in that: The coupling mechanism (7) is fixedly connected to a drive motor (8) on the side away from the linkage cavity (1), and the drive motor (8) is used to drive the entire set of equipment to operate.

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