In-tube concentric double helix static mixer

Abstract

The invention relates to an in-tube concentric double helix static mixer, and relates to a fluid mixer. In-twisted blades with the same helical direction are uniformly distributed on an outer wall of a positioning round bar (6) along a circumference direction, to form an inner helical element. Out-twisted blades with the same helical direction are uniformly distributed on an inner wall of a tubular body (7) along a circumference direction, to form an outer helical element. Radial adjacent inner (outer) helical elements have opposite helical directions. Heads and tails of the helical elements are successively connected and staggered a certain angle in a circumferential direction. Lengths of inner and outer helical elements are identical and helical directions of the inner and outer helical elements at corresponding radial positions are opposite. The fluid can form two inner and outer concentric helix flows with the opposite helical directions under the effect of inner and outer helical elements; fluid in each helical flow can be cut, rotated and merged; and radial mixture of the fluid can be reinforced. The invention is suitable for mixture or reaction of various fluids, and is particularly suitable for operation conditions with large processing capacity, relatively small requirements for flow pressure drop but not relatively long mixer length.

Description

technical field [0001] The invention relates to a fluid material mixer, in particular to a concentric double-helix static mixer in a tube. Background technique [0002] A static mixer is a tubular mixing device capable of continuous mixing or reaction of two or more fluids. Static mixers have no moving components, but use the movement of the fluid itself to achieve fluid mixing under the action of mixing elements. The structure and arrangement of the mixing elements determine the flow state of the fluid, which has an important impact on the mixing performance or reaction effect of the mixer. Among the many static mixers that have been industrialized, they are mainly divided into three types of mixers: swirl type, bypass type and split flow type according to the different methods of action of the mixing elements on the fluid. Among them, the swirl mixer is represented by the Kenics mixer, which uses twisted blades to force the fluid to flow helically in the mixing tube, an...

AI Technical Summary

Problems solved by technology

Obviously, the circumvention and split flow mixers do not meet such requirements due to the large pressure drop per unit tube length, so only the mixer that meets the requirements of the above working conditions can be selected in the swirl mixer.

However, due to the relatively poor mixing performance of the existing swirl mixers, a new and efficient swirl mixer must be developed to adapt to the above-mentioned relatively harsh operating conditions

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