Axial flow type stirrer and method for producing the same

Abstract

The invention discloses an axial-flow blender and a manufacturing method thereof. The axial-flow blender comprises a mixer shaft, a hub, a blade, a fastening piece and a blade handle. The hub is arranged on the axial-flow blender; the blade is connected with the hub by the fastening piece through the blade handle. The blade of the mixer takes spatially twisted shape, the tilt angle of the front end of the blade, beta t is smaller than the tilt angle of the root part of the blade, beta a. The section of the blade at any radius part is of an arch structure. The surface of the blade is a part of a cylndrical surface and can be obtained from slantwise cutting a cylinder which is formed by rolling a sheet of metal beforehand or a part of the cylinder. The blender has the advantages of large discharging capability, simple manufacture requiring no mould, material saving and flexibly regulated parameters, etc. Taking catalytic hydrogenation of an intermediate of vitamin H for example, the reaction time is shortened to be within 3 hours from more than 16 hours of original time by adopting the axial-flow blender, and the energy consumption is small, the product quality is good and the catalyst is saved.

Description

technical field [0001] The invention relates to a stirrer, in particular to an axial flow stirrer and a manufacturing method thereof. Background technique [0002] Axial flow agitators have been widely used in the mixing process of medium and low viscosity media such as gas-liquid, gas-liquid-solid, liquid-solid, liquid-liquid, etc. in petrochemical, fine chemical, biomedicine, metallurgy and other industries. Commonly used axial flow agitators are marine propulsion agitators and folded blade turbines. The propulsion agitators adopt an equal-pitch structure with large axial displacement and high efficiency. However, due to the use of mold casting, the cost is high and the specifications are small Meet the needs of practical industrial applications, especially in large mixing equipment can not be used. The folded blade turbine with an inclination angle of 45° or less is also an axial-flow agitator, which is simple in design, low in manufacturing cost, and easy to be enlarged...

AI Technical Summary

Problems solved by technology

Obviously, the impeller of this structure has two defects: (1) It can be seen from Fig. 2 that since the generatrix of the cylindrical surface forming the blade and the center line 9 of the hub are perpendicular to each other, the blades in different diameters The views of the cross-section to the position all fall on the same arc, which cannot form a spatial torsion structure similar to that of a propulsion mixer, thereby affecting its pumping efficiency; The utilization rate of the steel plate is reduced, which is not conducive to cost saving

But in fact, the known axial flow agitator has not been able to reduce the manufacturing cost to the greatest extent while maintaining the high discharge performance of the agitator, this is because the high performance axial flow agitator is all in the form of space torsion Change the inclination angle of the blades at different radial positions, thus improving discharge performance

However, some of the known axial flow agitators have a space torsion structure and high discharge performance, but they need to be pressed by a mold; the blades of the other part of the agitator use a combination of several curved surfaces, and the effect similar to the space torsion can be obtained without a die. , but the manufacturing is still complicated; some of the blades of the agitator adopt a curved surface with a simple structure, such as a cylindrical surface, which is simple to manufacture, but loses the structural characteristics of space torsion, thereby reducing the discharge performance

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