CBY-through-flow three-curved-blade disc turbine combined paddle

Abstract

The invention discloses a CBY-through-flow three-curved-blade disc turbine combined paddle which comprises an upper layer paddle and a lower layer paddle, the upper layer paddle is a CBY paddle, and the lower layer paddle is a through-flow three-curved-blade disc turbine paddle. According to the three-curved-blade disc turbine paddle, through-flow holes are formed in paddle blades and a disc, and three arc-shaped auxiliary paddles are arranged below the disc. According to the combined paddle disclosed by the invention, the speed'dead zone 'in the stirring tank is effectively reduced, so that not only is uniform mixing of substances in the stirring tank facilitated, but also deposition and scaling phenomena of the materials in the stirring tank are avoided, and the effect of the whole stirring process is effectively improved; and meanwhile, the trailing vortex generated by the lower paddle is more continuous and uniform, and the flow field structure of the lower paddle area is optimized. According to the combined stirring paddle, the flow field effect is obviously changed, the mixing time is shortened, and the stirring effect is effectively enhanced.

Description

Technical Field

[0001] This invention relates to a CBY-through-flow three-bend disk turbine combined propeller. Background Technology

[0002] Traditional agitators often exhibit uneven solution distribution during dissolution and mixing. This is primarily because the centrifugal force on the impeller blades increases from the inside out, resulting in insufficient centrifugal force near the agitator shaft, creating a "dead zone." This leads to uneven agitation, ultimately resulting in uneven mixing, gel formation, or lumps in the final product. While multi-layered agitators are typically used to eliminate dead zones, this method often struggles to achieve good dispersion, mixing, and dissolution simultaneously in high-viscosity solutions, leading to decreased agitation efficiency. Summary of the Invention

[0003] To address the shortcomings of traditional multi-layered agitators in existing dissolution and mixing processes, this invention effectively reduces the velocity "dead zone" in the mixing tank and the phenomena of material deposition and scaling, providing a novel combined agitator that makes the flow field more conducive to overall circulation.

[0004] To achieve this objective, the present invention adopts the following technical solution: A CBY-through-flow three-bend disc turbine combined propeller includes an upper propeller and a lower propeller. The upper propeller is a CBY propeller (1), and the lower propeller is a novel three-bend disc turbine propeller (2). The blade tip angle of the upper CBY propeller (1) is 15°, the blade root angle is 45°, and the blade diameter is the same as that of the lower three-bend disc turbine propeller (2), which is 0.4~0.6T, where T is the diameter of the stirred tank.

[0005] The interlayer spacing between the upper CBY impeller (1) and the lower through-flow three-bend disc turbine impeller (2) is 0.24H to 0.27H, and the distance between the lower through-flow three-bend disc turbine impeller (2) and the bottom of the vessel is 0.23H to 0.26H, where H is the height of the stirred vessel.

[0006] The lower three-bladed disc turbine propeller (2) has a main blade (21) and a secondary blade (22) evenly distributed, with the convex surfaces of the two rotating in opposite directions.

[0007] The lower-layer three-bend disc turbine propeller (2) has holes (23) on both the main blade and the disc, with a hole diameter of 8-10 mm.

[0008] The combined stirring impeller of this invention features a lower-layer three-bend disc turbine impeller with a through-flow hole design that balances the pressure difference between the front and rear, reduces the velocity gradient, refines the rear vortex and expands its influence range, and enhances vortex diffusion, thereby improving energy transfer efficiency and mixing effect. The three arc-shaped auxiliary impellers at the bottom enhance the turbulent kinetic energy of the fluid, reduce the dead zone at the bottom, and prevent material deposition. At the same time, the axial action of the CBY impeller pushes the radial jet to impact the vessel wall and form an upward large circulation flow, further enhancing the overall stirring performance. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of a novel combined propeller according to the present invention; Figure 2 Schematic diagram of a three-bladed disk turbine propeller with cross-flow characteristics; Figure 3 Schematic diagram of CBY-three-bend turbine propeller; Figure 4 This is a flow field diagram inside the combined paddle agitator of the present invention.

[0010] In the diagram, 1 is the CBY impeller; 2 is the through-flow three-bend disc turbine impeller; 3 is the three-bend turbine impeller; and 4 is the stirring shaft. Detailed Implementation

[0011] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. Example 1

[0012] Appendix Figure 1 The combined impeller includes a lower three-bend disc turbine impeller 1 and an upper CBY impeller 2; the disc turbine impeller 1 has flow holes 23 designed on both the disc and the blades, and an arc-shaped auxiliary impeller 22 is arranged opposite to the convex surface of the blade 21 below the disc.

[0013] The blade tip angle of CBY propeller 1 is 15°, the blade root angle is 45°, and the blade diameter is the same as that of the through-flow three-bend disc turbine propeller 2, which is 0.4 to 0.6T, where T is the diameter of the mixing vessel.

[0014] The interlayer spacing between the CBY inclined blade propeller 1 and the disc turbine propeller 2 is 0.24H to 0.27H, and the distance between the disc turbine propeller 2 and the bottom of the vessel is 0.23H to 0.26H, where H is the height of the stirred vessel.

[0015] The three-bladed disc turbine propeller 2 has main blades 21 and secondary blades 22 evenly distributed, with their convex surfaces rotating in opposite directions; both the main blades and the disc of the disc turbine propeller 2 have openings 23, with a diameter of 8-10 mm. The flow-through holes 23 of the lower three-bend disc turbine propeller can effectively balance the pressure difference before and after the blades, reduce the velocity gradient of the nearby fluid, thereby refining the large-scale vortex behind, expanding the influence range of the vortex, enhancing energy transfer and utilization, and improving the mixing effect; the three arc-shaped auxiliary propellers 22 at the bottom improve the turbulent kinetic energy of the fluid, reduce the velocity "dead zone" at the bottom, and prevent material deposition and scaling.

[0016] The radial jet action of the three-bend disc turbine blades 21 not only propels the fluid towards the wall of the mixing tank, but also, after these jets impact the tank wall, some of the fluid flows upward along the wall surface. Subsequently, under the influence of the upper CBY impeller shaft suction, a large circulation is formed in the upper part of the mixing tank, avoiding the generation of local small vortices and enhancing the mixing effect. The mixing effect of the combined impeller designed in this invention is described and demonstrated below through Examples 2 and 3. Example 2

[0017] The flow field of the combined impeller in the vessel was tested on the stirring technology experimental platform test system (patent number: ZL201110148263.3). The platform includes a transparent stirring vessel with an inner diameter T=430mm, a wall thickness δ=6mm, a vessel height H=670mm, and a liquid level height of 620mm. The flow field diagram of the combined stirring impeller provided by the present invention was observed under the conditions of a rotation speed of 120rpm, a layer spacing of 0.27H, and a distance from the bottom of 0.26H.

[0018] Particle image velocimetry (PIV), as a non-contact measurement method, can capture complex fluid flow patterns within a flow field, and is therefore widely used in the field of fluid mechanics. A dual-pulse laser emits two laser beams sequentially within an extremely short time interval, forming two luminescent regions composed of tracer particles inside the stirred tank. With the precise control of a synchronizer, the camera and laser work together to continuously capture two flow field images. By analyzing the positional changes of the tracer particles in these two images and considering the time difference between the two captures, the fluid velocity at the corresponding position in the flow field can be accurately calculated, and thus the velocity vector field of the entire flow field can be statistically determined. The flow field diagram inside the stirred tank of this invention is shown below. Figure 4 As shown, the lower-level disc turbine propeller generates a strong radial flow at the blade tip, which impacts the tank wall and forms upward and downward flows, creating a circulation zone on each side of the blade. The upward flow interacts with the axial flow of the upper-level CBY propeller to form a central circulation flow, while the downward flow is guided by the elliptical inner wall at the bottom of the tank to flow back to the center of the turbine propeller, forming a bottom circulation flow. The upper and lower blades work together to form a dual circulation flow within the tank, which effectively prevents material accumulation and blockage. Example 3

[0019] The structure and dimensions of the stirring tank in this embodiment are the same as those in Embodiment 2. For the stirring technology experimental platform test system (Patent No.: ZL201110148263.3), the test device mainly consists of a computer control cabinet, a stirring shaft rotation control device, and a hydraulic lifting device. The special software supporting the microcomputer control system can monitor in real time the performance indicators and parameter performance such as the mixing time and stirring power of the stirrer. The mixing time is measured by the temperature difference method.

[0020] Table 1 shows the mixing time tables of two different combinations of impellers under the same conditions. The data shows that at the same rotational speed, the mixing time of the perforated CBY - three - curved - blade disk turbine impeller is shorter than that of the CBY - three - curved - blade turbine impeller. The time for the tracer concentration in the stirring tank with the perforated CBY - three - curved - blade disk turbine impeller to reach stability is the shortest, and the stirring and mixing effect is better.

[0021] Table 1. Mixing time tables of two different combinations of impellers under the same conditions Stirring speed N (rpm) The mixing time (s) of the stirring paddle in this invention CBY-Three-bladed turbine propeller mixing time (s) Time reduction rate 80 20.53 23.16 11.4% 100 17.92 20.37 13.7% 120 15.84 18.24 13.2% 140 14.17 16.25 12.8%

Claims

1. A CBY-through-flow three-bend disk turbine combined propeller, comprising an upper propeller and a lower propeller, characterized in that: The upper impeller is a CBY impeller (1), and the lower impeller is a new type of three-bend disc turbine impeller (2). The blade tip angle of the upper CBY impeller (1) is 15°, the blade root angle is 45°, and the blade diameter is the same as that of the lower three-bend disc turbine impeller (2), which is 0.4~0.6T, where T is the diameter of the mixing vessel.

2. The CBY-through-flow three-bend disk turbine combined propeller according to claim 1, characterized in that: The interlayer spacing between the upper CBY impeller (1) and the lower through-flow three-bend disc turbine impeller (2) is 0.24H to 0.27H, and the distance between the lower through-flow three-bend disc turbine impeller (2) and the bottom of the vessel is 0.23H to 0.26H, where H is the height of the stirred vessel.

3. The CBY-through-flow three-bend disk turbine combined propeller according to claim 1, characterized in that: The lower three-bladed disc turbine propeller (2) has a main blade (21) and a secondary blade (22) evenly distributed, with the convex surfaces of the two rotating in opposite directions.

4. The CBY-through-flow three-bend disk turbine combined propeller according to claim 1, characterized in that: The lower-layer three-bend disc turbine propeller (2) has holes (23) on both the main blade and the disc, with a hole diameter of 8-10 mm.

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