Double-paddle type asymmetric wing type stirring paddle

Abstract

The invention provides a double-paddle type asymmetric wing-shaped stirring paddle, and an efficient mixing function is realized through structural innovation. The stirring paddle is mainly composed of a stirring shaft and a paddle blade of a double-paddle structure, and the paddle blade adopts an asymmetric wing type design and is composed of a series of wing type units with different section positions. In the working process, the blade airfoil of the stirring paddle generates acting force such as thrust and shearing force on liquid through specific layout, a high-viscosity medium is driven to form a complex flow field, and the liquid and materials are evenly mixed. Different from a traditional stirring paddle structure, the double-paddle stirring paddle adopts a double-paddle layout, and by optimizing the spatial positions and airfoil parameters of the two paddles, the stirring efficiency is effectively improved, and the action range of a flow field is expanded. The core innovation point is that key geometric parameters such as airfoil attack angles and chord lengths of different section positions of the paddles and the position distance between the two paddles can be adjusted according to actual stirring requirements, so that the mixing requirements under different viscosity and solid content working conditions are met, and an efficient and flexible equipment solution is provided for a solid-liquid mixing process.

Description

Technical Field

[0001] The present invention relates to the technical field related to high-viscosity liquid solid-liquid stirring, in particular to a double-blade asymmetric wing-shaped stirring paddle. Background Art

[0002] In industries such as chemical, food, and pharmaceuticals, mixing high-viscosity liquids is a common process. Traditional impellers, such as pitched-blade impellers, rely on large blades for forced agitation. However, as the viscosity of the liquid increases, driving power increases, resulting in high energy consumption and low mixing efficiency. Summary of the Invention

[0003] In response to the defects of the existing technology, the present invention proposes a double-blade asymmetric airfoil stirring paddle, which realizes solid-liquid mixing and stirring of high-viscosity media through asymmetric airfoil design and double-blade structural layout. At the same time, the overall stability is ensured through welding of the fixed structure, thereby solving the problems of low mixing efficiency, poor adaptability to working conditions and insufficient structural reliability of existing equipment.

[0004] A double-blade asymmetric airfoil stirring impeller includes a stirring shaft and a double-blade structure, and the specific structure is as follows:

[0005] The core components include the stirring shaft and upper and lower paddles.

[0006] The stirring shaft is used to connect the power source device to provide power for the entire stirring paddle; the double propeller is divided into an upper propeller and a lower propeller, and the blades are composed of at least two asymmetric airfoil cross-section units, each of which has independent parameters such as the angle of attack α and chord length l; according to specific task requirements, the number of blades of the upper or lower propeller of the double propeller can be designed to be 2 to 4, so that the stirring paddle generates a composite flow field during the rotation process, thereby improving the solid-liquid stirring efficiency and mixing uniformity.

[0007] The airfoil section unit adopts the NACA series asymmetric airfoil, which has good lift characteristics in fluid dynamics and can well generate thrust, shear force and other forces in liquid stirring. The leading edge radius R and chord length l of each airfoil section unit meet a certain proportional relationship, which can ensure the fluid separation characteristics of the airfoil leading edge. The trailing edge has a certain angle θ to reduce the fluid wake disturbance and reduce the energy loss during the stirring process.

[0008] The airfoil cross-sectional units of the double blades form a gradient parameter distribution along the axial direction of the blades, including airfoil geometric parameters such as angle of attack and chord length, and the design parameters such as the angle of attack difference Δα and chord length change rate ΔL / L of adjacent cross-sectional units are controlled within a certain range according to mission requirements; through this gradient parameter design, the blades can generate a gradient thrust on the liquid when rotating, forming an axial and radial composite flow from the root to the end of the blades, effectively eliminating the flow dead zone during the stirring process and improving the solid-liquid mixing effect.

[0009] The stirring shaft and the blades are fixedly connected by welding, and the welding adopts the full penetration butt welding or fillet welding process. The welded connection structure can ensure a rigid connection between the stirring shaft and the blades, effectively transmit the rotational torque, and ensure the overall structural strength of the stirring blade when running in high-viscosity media.

[0010] The double-propeller blades are made of high-strength stainless steel or carbon fiber reinforced composite materials. The high-strength stainless steel material can improve the corrosion resistance and mechanical strength of the blades, and is suitable for a variety of chemical media environments; carbon fiber reinforced composite materials have the characteristics of high strength and low density, which can reduce driving energy consumption while meeting the structural stability requirements under high-speed conditions.

[0011] Beneficial effects: When working, the agitator blade airfoil generates thrust, shear force and other forces on the liquid through a specific layout, drives the high-viscosity medium to form a complex flow field, and realizes uniform mixing of the liquid and the material. Different from the traditional agitator structure, the present invention adopts a double-propeller layout, which effectively improves the stirring efficiency and expands the range of the flow field by optimizing the spatial position and airfoil parameters of the two propellers. The core innovation is that the key geometric parameters such as the airfoil angle of attack and chord length of the blades at different cross-sectional positions and the position distance between the two propellers can be adjusted according to actual stirring needs, so as to meet the mixing requirements under different viscosity and solid content conditions, and provide an efficient and flexible equipment solution for the solid-liquid mixing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a model diagram of a double-blade asymmetric airfoil impeller;

[0013] Figure 2 It is the front view of the stirring paddle;

[0014] Figure 3 This is a side view of the stirring paddle;

[0015] Figure 4 This is a simulation diagram of solid-liquid mixing of the stirring paddle; DETAILED DESCRIPTION

[0016] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings and implementation examples. However, the scope of protection of the present invention is not limited by the specific implementation methods. Obviously, the implementation examples described are only part of the implementation examples of the present invention, not all of the implementation examples.

[0017] like Figure 1 1 is a model diagram of a double-blade asymmetric airfoil stirring impeller, comprising a stirring container 1 and a stirring impeller 2.

[0018] like Figure 2The figure shows a front view of the stirring paddle, which is mainly composed of a stirring shaft 21 and blades of a double-propeller structure. The double propeller includes an upper propeller 22 and a lower propeller 23. The blades adopt an asymmetric airfoil design. The blades are composed of at least two asymmetric airfoil cross-sectional units, and each airfoil cross-sectional unit has independent parameters such as angle of attack α and chord length l. According to specific task requirements, the number of blades of the upper propeller or the lower propeller of the double propeller can be designed to be 2 to 4, so that the stirring paddle generates a composite flow field during the rotation process, thereby improving the solid-liquid stirring efficiency and mixing uniformity.

[0019] like Figure 3 The figure shows a side view of the stirring paddle. The cross-sectional airfoil units of the upper paddle 22 and the lower paddle 23 have a mirror-symmetrical design structure, so that the upper and lower blades are subjected to balanced forces when the stirring paddle rotates, reducing axial vibration.

[0020] The airfoil section unit adopts the NACA series asymmetric airfoil, which has good lift characteristics in fluid dynamics and can well generate thrust, shear force and other forces in liquid stirring. The leading edge radius R and chord length l of each airfoil section unit meet a certain proportional relationship, which can ensure the fluid separation characteristics of the airfoil leading edge. The trailing edge has a certain angle θ to reduce the fluid wake disturbance and reduce the energy loss during the stirring process.

[0021] The airfoil cross-sectional units of the double blades form a gradient parameter distribution along the axial direction of the blades, including airfoil geometric parameters such as angle of attack and chord length, and the design parameters such as the angle of attack difference Δα and chord length change rate ΔL / L of adjacent cross-sectional units are controlled within a certain range according to mission requirements; through this gradient parameter design, the blades can generate a gradient thrust on the liquid when rotating, forming an axial and radial composite flow from the root to the end of the blades, effectively eliminating the flow dead zone during the stirring process and improving the solid-liquid mixing effect.

[0022] The stirring shaft and the blades are fixedly connected by welding, and the welding adopts a full penetration butt welding or fillet welding process; the welding fixed structure can ensure a rigid connection between the stirring shaft and the blades, effectively transmit the rotational torque, and ensure the overall structural strength of the stirring blade when running in a high viscosity medium.

[0023] The double-propeller blades are made of high-strength stainless steel or carbon fiber reinforced composite materials. The high-strength stainless steel material can improve the corrosion resistance and mechanical strength of the blades, and is suitable for a variety of chemical media environments; carbon fiber reinforced composite materials have the characteristics of high strength and low density, which can reduce driving energy consumption while meeting the structural stability requirements under high-speed conditions.

[0024] like Figure 4The figure shows a simulation diagram of solid-liquid mixing of a stirring paddle. The stirring paddle is used to simulate the solid-liquid mixing of high-viscosity liquids and materials. The Euler model is used, and the properties of the materials used are set, including parameters such as density and viscosity. The rotation axis coordinates and rotation speed are defined for the stirring paddle and the computational fluid domain. The solid-liquid mixing effect of the stirring paddle is obtained through simulation.

[0025] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that some local modifications or changes may be made without departing from the principles and essential features of the present invention, all of which fall within the scope of protection of the present invention. Therefore, from all perspectives, the embodiments should be considered as exemplary and non-limiting, and the scope of the present invention is determined by the appended claims. The present invention does not cover parts that are identical to or can be implemented using existing technologies.

Claims

1. A double-blade asymmetric airfoil impeller, characterized by: It includes a stirring shaft and a blade with a double-propeller structure; the stirring shaft is used to connect to a power source device to provide power for the entire stirring paddle; the double propeller is divided into an upper propeller and a lower propeller, and the blade is composed of at least two asymmetric airfoil cross-section units, each of which has independent parameters such as angle of attack α and chord length l; according to specific task requirements, the number of blades of the upper propeller or lower propeller of the double propeller can be designed to be 2 to 4, so that the stirring paddle generates a composite flow field during rotation, thereby improving the solid-liquid stirring efficiency and mixing uniformity.

2. The double-blade asymmetric airfoil impeller according to claim 1, characterized in that: The airfoil section unit adopts a NACA series asymmetric airfoil, which has good lift characteristics in fluid dynamics and can effectively generate thrust, shear force and other forces during liquid stirring. The leading edge radius R and chord length l of each airfoil section unit meet a certain proportional relationship, which can ensure the fluid separation characteristics of the airfoil leading edge. The trailing edge has a certain angle θ to reduce fluid wake disturbance and reduce energy loss during the stirring process.

3. The double-blade asymmetric airfoil impeller according to claim 1, characterized in that: The airfoil cross-sectional units of the double blades form a gradient parameter distribution along the axial direction of the blades, including airfoil geometric parameters such as angle of attack and chord length, and design parameters such as the angle of attack difference Δα and chord length change rate ΔL / L of adjacent cross-sectional units are controlled within a certain range according to task requirements; through this gradient parameter design, the blades can generate a gradient thrust on the liquid when rotating, forming an axial and radial composite flow from the root to the end of the blades, effectively eliminating the flow dead zone during the stirring process, and improving the solid-liquid mixing effect.

4. The double-blade asymmetric airfoil impeller according to claim 1, characterized in that: The stirring shaft and the blades are fixedly connected by welding, and the welding adopts a full penetration butt welding or fillet welding process; the welding fixed structure can ensure a rigid connection between the stirring shaft and the blades, effectively transmit the rotational torque, and ensure the overall structural strength of the stirring blade when running in a high-viscosity medium.

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