A plate propeller and a stirrer using the same

Abstract

The utility model discloses a kind of plate type propeller and the stirrer using the propeller, it relates to mixing equipment technical field. Including paddle shaft, connecting block and paddle, paddle shaft is connected with paddle through connecting block, the paddle shaft adopts ladder shaft diameter structure, diameter gradually decreases from top to bottom (such as shaft diameter ratio 1.2:1), under the premise of guaranteeing the bearing strength of paddle shaft root, effectively reduce the moment of inertia and overall weight. The utility model reduces eddy current loss by optimizing paddle structure, pitch distribution and connection mode, improves axial drainage capacity, while enhancing paddle stability, reduces energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of mixing equipment technology, specifically to a plate propeller and a mixer using the propeller. Background Technology

[0002] In existing plate propeller mixers, localized eddies easily form between the blades and the fluid during mixing, leading to increased energy loss. Furthermore, traditional blades are mostly designed with equal width or pitch, resulting in insufficient axial propulsion efficiency. This is particularly problematic in mixing low-viscosity fluids, where "slippage" can easily occur, affecting mixing uniformity and efficiency. In addition, the connection between the blades and the hub is often rigidly fixed, which, after prolonged use, can lead to stress concentration, causing blade deformation or breakage and reducing the equipment's lifespan.

[0003] In summary, this utility model designs a plate propeller and a stirrer using the propeller. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a plate propeller and an agitator using the propeller. By optimizing the blade structure, pitch distribution, and connection method, eddy current losses are reduced, axial discharge capacity is improved, blade stability is enhanced, and energy consumption is reduced.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a plate propeller, including a propeller shaft, a connecting block and a propeller blade. The propeller shaft is connected to the propeller blade through the connecting block. The propeller shaft adopts a stepped shaft diameter structure, with the diameter gradually decreasing from top to bottom (e.g., shaft diameter ratio 1.2:1). While ensuring the load-bearing strength at the root of the propeller shaft, the moment of inertia and overall weight are effectively reduced.

[0006] Preferably, the inner end of the connecting block is an arc-shaped structure that matches the propeller shaft, and the connecting block is provided with a first fixing hole.

[0007] Preferably, the connecting blocks are evenly distributed at 120° circumferentially along the propeller shaft.

[0008] Preferably, the blade is provided with a second fixing hole that is connected to the connecting block by bolts.

[0009] Preferably, the blade has an airfoil structure with a 150° bending angle and a radius of curvature R of 150 mm.

[0010] Preferably, the connecting block is provided with reinforcing ribs on its outer periphery.

[0011] An agitator using this propeller includes the aforementioned plate propeller, a drive motor, and an agitation tank. Two sets of arc-shaped baffles (width is 1 / 10 of the tank diameter) are symmetrically arranged on the inner wall of the agitation tank. The gap between the baffles and the end of the propeller blade is 1 / 5 of the propeller blade diameter, guiding the tangential flow to be converted into axial flow and avoiding vortex dead zones. The distance between the bottom of the propeller blade and the bottom of the agitation tank is 0.8 times the propeller blade diameter. Combined with the flow-guiding ribs (2mm high, 10mm spacing) on ​​the lower surface of the propeller blade, the bottom fluid circulation capacity is enhanced.

[0012] The beneficial effects of this utility model are:

[0013] 1. The stepped shaft design significantly reduces rotational inertia while ensuring necessary strength, resulting in energy saving, consumption reduction, and smoother operation, making it particularly suitable for operating conditions with frequent start-stop cycles.

[0014] 2. High mixing efficiency: The airfoil-shaped blades, combined with a 150° bending angle, generate a powerful axial flow, resulting in short mixing time and excellent mixing effect. Combined with the baffles inside the tank, it achieves mixing throughout the entire tank without dead zones.

[0015] 3. Strong bottom circulation: The optimized clearance from the bottom and the guide ribs on the lower surface of the blades work together to greatly enhance the disturbance and conveying capacity of the material at the bottom of the tank, effectively preventing sedimentation.

[0016] 4. Modular structure: The blades are bolted to the propeller shaft via connecting blocks, achieving a modular design that makes installation and maintenance extremely convenient and reduces operating costs. Attached Figure Description

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments;

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 for Figure 1 Top view;

[0020] Figure 3 This is a schematic diagram of the blade structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the connecting block structure of this utility model. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] Reference Figure 1-4This specific embodiment provides a plate-type propeller, including a propeller shaft 1, connecting blocks 2, and blades 3. The propeller shaft 1 adopts a stepped shaft structure, with the diameter decreasing in a 1.2:1 ratio from the drive end to the end. This design not only effectively reduces the rotational inertia at the far end of the shaft and reduces the starting and stopping torque, but also avoids stress concentration through a reasonable diameter transition, enhancing the overall rigidity and bending resistance of the shaft, and facilitating processing and assembly. There are three connecting blocks 2, evenly distributed at 120° intervals along the circumference of the propeller shaft 1. Their inner ends are designed as arc-shaped structures 21 that fit tightly against the stepped surface of the propeller shaft 1, and are fixed by bolts or welding, ensuring the smoothness and reliability of force transmission. Reinforcing ribs are provided on the outer periphery of the connecting blocks 2, further improving their structural strength and torsional resistance. A first fixing hole 22 is provided on the connecting blocks 2. There are three blades 3, each corresponding to one of the three connecting blocks 2. The blades 3 are detachably connected to the first fixing hole 22 of the connecting blocks 2 by bolts passing through the second fixing hole 31, facilitating installation, cleaning, and replacement. The cross-section of blade 3 is airfoil-shaped. This airfoil design generates lift during rotation, effectively propelling the fluid axially and reducing stirring resistance. Blade 3 has a 150° bend angle relative to the plane of rotation, combined with a 150mm radius of curvature, optimizing the blade pitch so that it can effectively propel the fluid at different radial positions.

[0024] A mixer utilizing the aforementioned plate propeller includes a drive motor, a mixing tank, and the aforementioned plate propeller. Two sets of arc-shaped baffles are symmetrically arranged on the inner wall of the mixing tank. The width of the baffles is 1 / 10 of the tank's inner diameter, and the radial clearance between the baffles and the outer edge of the propeller blades is 1 / 5 of the propeller blade diameter. This design effectively disrupts tangential flow, transforming it into axial and radial flow that promotes overall mixing, thus completely eliminating vortex dead zones. When the propeller blades rotate, the distance between its lowest point and the bottom of the mixing tank is set to 0.8 times the propeller blade diameter. This optimized clearance ensures sufficient disturbance of the bottom material by the propeller blades while avoiding the increased energy consumption and wear risk caused by excessively small clearances. The lower surface of the propeller blades 3 is provided with guide ribs. The ribs are 2mm high, spaced 10mm apart, and arranged radially or parallel to the leading edge of the propeller blades. When the propeller blades rotate, these ribs generate a strong pumping effect on the fluid at the bottom of the tank, forcibly pushing the bottom material to participate in the entire tank circulation, effectively preventing solid particle deposition.

[0025] Example 1: Refer to Figure 1-4This embodiment provides a high-efficiency, low-inertia plate propeller. The propeller shaft 1 is made of 304 stainless steel and adopts a stepped shaft design, with an upper shaft diameter of 60mm and a lower shaft diameter of 50mm, in a ratio of 1.2:1. Three connecting blocks 2 are made of cast steel and are fixed to the stepped surface of the propeller shaft 1 by high-strength bolts, with radially distributed reinforcing ribs on their outer periphery. The three blades 3 are stamped from corrosion-resistant stainless steel, with an airfoil section conforming to the NACA series airfoil, a bending angle precisely set to 150°, and a radius of curvature R of 150mm.

[0026] This propeller was applied to the agitator of a reactor in a chemical plant. The reactor tank has an inner diameter of 1000 mm. Two sets of arc-shaped baffles are symmetrically welded to the inner wall of the tank. The baffles are 100 mm wide (1 / 10 of the tank diameter), and the gap between the baffles and the outer edge of the propeller blades is 50 mm (1 / 5 of the 250 mm diameter of the propeller blades). The gap between the propeller blades and the bottom is 200 mm (0.8 times the diameter of the propeller blades). The lower surface of the propeller blades is machined with linear guide ribs with a height of 2 mm and a spacing of 10 mm.

[0027] In actual operation, compared with the traditional three-bladed swept propeller, the time to achieve the same mixing uniformity is shortened by about 30%, the motor starting current is reduced by 15%, there is no material deposition at the bottom of the tank, the equipment runs smoothly, and vibration and noise are significantly reduced.

[0028] Example 2: In this example, to accommodate materials with higher viscosity, the fixed position of the connecting block 2 on the propeller shaft 1 can be finely adjusted axially, thereby changing the clearance between the propeller blade and the bottom. Simultaneously, the bending angle of the propeller blade 3 can be selected within the range of 140° to 160° as needed to achieve the optimal axial and radial flow ratio.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A plate-type propeller, characterized in that, The device includes a propeller shaft (1), a connecting block (2), and a propeller blade (3). The propeller shaft (1) is connected to the propeller blade (3) through the connecting block (2). The propeller shaft (1) adopts a stepped shaft diameter structure, with the diameter gradually decreasing from top to bottom. The inner end of the connecting block (2) is an arc-shaped structure (21) that matches the propeller shaft (1). The connecting block (2) is provided with a first fixing hole (22). The propeller blade (3) is provided with a second fixing hole (31) that is connected to the connecting block (2) by bolts. The cross section of the propeller blade (3) is an airfoil structure with a 150° bending angle and a radius of curvature R of 150 mm.

2. A plate propeller according to claim 1, characterized in that, The connecting blocks (2) are evenly distributed 120° around the propeller shaft (1).

3. A plate propeller according to claim 1, characterized in that, The connecting block (2) is provided with reinforcing ribs on its outer periphery.

4. A stirrer using the propeller, characterized in that, The device includes a plate propeller, a drive motor, and a mixing tank as described in any one of claims 1-3. Two sets of arc-shaped baffles are symmetrically arranged on the inner wall of the mixing tank. The gap between the baffles and the blade ends is 1 / 5 of the blade diameter, which guides the tangential flow to be converted into axial flow and avoids vortex dead zones. The distance between the bottom of the blade and the bottom of the mixing tank is 0.8 times the blade diameter. In conjunction with the flow-guiding ribs on the lower surface of the blade, the bottom fluid circulation capacity is enhanced.

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