A spiral-type and paddle-type compound agitator with special-shaped dispersing discs and comb spoilers

Abstract

A helical and paddle type composite agitator with a special-shaped dispersing disc and a comb spoiler, characterized in that it consists of a stirring tank assembly, a helical agitator assembly, a paddle agitator assembly, a double-sided helical tooth dispersing Composed of disc assembly, turbine blade type dispersing disc assembly and motor; the inner wall of the tank is welded with a comb spoiler, when the agitator is working, the streamline coverage inside the agitator is better, and the streamline has a relatively ideal vortex area , the design of the comb teeth can reduce the fouling of the material at the spoiler; the diameter of the special-shaped dispersing disc is larger, which can increase the coverage of the streamline at the bottom and the velocity range of the flow field during the stirring process, reduce the dead zone of stirring, and improve Stirring efficiency; there are helical blades with variable diameter and variable pitch on the screw shaft, the lower pitch of the blade is smaller, the diameter is larger, the helix angle is small, the vertical lifting speed of the ingredients is smaller, the stirring effect is better, and the upper pitch of the blade is smaller. The larger diameter is smaller, and the vertical speed of ingredients is greatly increased, which is more conducive to the spiral upward movement of ingredients.

Description

technical field [0001] The invention belongs to the field of fluid machinery, and in particular relates to a screw type and paddle type composite agitator with a special-shaped dispersing disc and a comb spoiler. Background technique [0002] At present, asphalt waterproof material is a kind of building material widely used in industrial and civil building waterproofing, moistureproofing, municipal engineering waterproofing, and water conservancy facility waterproofing. It has good adhesion, plasticity, water resistance and corrosion resistance. Among them, Modified asphalt waterproofing membrane is the most widely used. Modified asphalt is an asphalt mixture made by adding high molecular polymers as modifiers to asphalt and uniformly mixing with asphalt to improve the properties of asphalt. Common modifiers include SBS and SBR; due to polymer polymerization The modified asphalt mixture is a high-viscosity, heterogeneous fluid, and there is partial adsorption between the po...

AI Technical Summary

Problems solved by technology

Modified asphalt is an asphalt mixture made by adding high molecular polymers as modifiers to asphalt and uniformly mixing with asphalt to improve the properties of asphalt. Common modifiers include SBS and SBR; due to polymer polymerization The modified asphalt mixture is a high-viscosity, heterogeneous fluid, and there is partial adsorption between the polymers, which leads to segregation between asphalt mixtures. , it is difficult to mix the asphalt mixture evenly with conventional mixing devices, which seriously affects the performance of modified asphalt

The conventionally designed agitator adopts a single-layer dispersing disc structure, and the diameter of the dispersing disc is small, and the dispersing disc structure is simple. The effect is not ideal, so that the material will accumulate around the dispersion plate, and the turbulent flow area cannot be formed well. In order to achieve the effect of uniform dispersion, the dispersion time has to be extended, which not only reduces the mixing efficiency, but also causes the material to Severe heat generation affects product quality; the screw shaft is a key component of the screw agitator, and its structural size directly affects the stirring effect. The screw pitch and blade diameter are important structural parameters of the screw shaft, and their values ​​directly affect the stress of the ingredients. When the diameter is large and the diameter is small, the helix angle is large, the vertical velocity of the material is large, and the extrusion effect is large; when the pitch is small and the diameter is large, the helix angle is small, the vertical velocity of the material is small, and the extrusion effect is strong Small, due to the effect of the gravity classification of the agitator, the coarse-grained material gathers in the lower part of the spiral agitator, and the fine-grained material gathers in the upper part of the helical agitator. The higher the stirring energy consumption, the greater the stirring intensity required. Due to the gravity of the grinding medium, the pressure on the lower part of the screw shaft agitator is greater, and its stirring intensity is higher. The pressure on the upper part of the material is smaller, and the stirring intensity is lower. , the stirring intensity gradually decreases from bottom to top. The traditional helical agitator adopts a helical shaft structure with fixed diameter and fixed pitch, which leads to the fact that the agitation intensity of the finer particles that require greater agitation intensity in the upper part of the helical agitator is reversed. Smaller, it is not suitable for the actual situation that the particle size of the upper material and the lower material in the spiral agitator is different, resulting in low mixing efficiency of the equipment and short service life of the wear parts; the inner wall of the mixing tank in the traditional agitator is smooth, the blades and the dispersion disc There is also a large distance from the inner wall of the mixing tank, and there will also be a dead zone around the inner wall of the mixing tank, resulting in the accumulation of materials around the inner wall of the mixing tank, which cannot form a turbulent zone well and reduces the mixing effect; the conventional design The spoiler will cause the material to scale at the welding place between the inner wall of the mixing tank and the spoiler, which is not conducive to the stirring and dispersion of the material, and reduces the mixing quality; compared with the compound mixer, the single mixer has a larger stirring coverage area If it is small, there will be more dead zones in stirring, which will make the stirring efficiency low, the stirring performance is not good, and the material dispersion effect is poor.

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