A self-priming gas-liquid mixing impeller

Abstract

The invention relates to a self-suction gas-liquid mixing impeller. It mainly consists of a shaft joint, a hollow disc, and guide vanes; a partition plate is arranged inside the hollow disc to divide the inner space of the hollow disc into two relatively independent spaces, the upper and the lower. The impeller can inhale gas through the negative pressure generated during rotation, and disperse the gas into the liquid in the form of micro-bubbles. It has the characteristics of large suction volume, good gas-liquid mixing effect, low energy consumption, and no clogging of the impeller. It is widely used. In the field of gas-liquid mixing and reaction, as well as the field of phase separation, and form a variety of special equipment, such as wastewater biochemical treatment equipment, air flotation equipment, waste gas purification equipment, and gas-liquid in the fields of chemical industry, pharmaceuticals, metallurgy, food, papermaking, etc. Contact and reaction equipment, etc.

Description

technical field [0001] The invention relates to a gas-liquid mixing device, in particular to a self-suction gas-liquid mixing impeller. Background technique [0002] The self-suction gas-liquid mixing impeller uses the negative pressure generated during the high-speed rotation of the impeller in the liquid to guide air or other gases from the hollow shaft driving the impeller or the sleeve outside the shaft to the impeller, and through the impeller. The gas is dispersed in the liquid in the form of microbubbles. It can be used in the field of chemical reaction between gas and liquid to improve mass transfer efficiency and simplify equipment structure; it can also be used in liquid-liquid separation and liquid-solid separation and other phase separation fields, such as removing solids, oil, fibers and other pollutants in sewage , can make pollutants adhere to the micro-bubbles, and rise to the water surface with the micro-bubbles, so as to achieve the purpose of pollutant se...

AI Technical Summary

Problems solved by technology

The disclosed impellers of US5091083, US5242600, US3414245, etc. include a plurality of hollow blades, and the air distribution holes are arranged on the rear side of the top of the blades. It utilizes the vacuum vortex generated on the rear side of the blades when the impeller rotates to introduce air into the impeller and release it into the water through the air distribution holes. ; This kind of impeller has low vacuum degree, small air suction capacity, and no suction and drainage capacity. It only depends on the agitation of the impeller to disperse the air bubbles, and the gas-liquid mixing and dispersion effect is poor; Enter the vacuum vortex and accumulate on the exhaust hole

The disclosed impellers of US6270061, US4297214, US2246560, US2238139, etc. are composed of upper and lower cover plates and guide vanes in the middle. The upper cover plate is provided with a water inlet, and the air inlet is located at the center of the impeller; The negative pressure area generated at the place sucks in air, and mixes it with water inside the impeller and discharges it from the periphery; the disadvantage of this impeller is that there is a contradiction that the suction volume and suction displacement cannot be increased at the same time, the number of impeller revolutions or the volume of air sucked It cannot be too large, because the water inlet and air inlet of the impeller are located in the center of the impeller, and the air-water mixture is inhaled in the center of the impeller. As the number of revolutions increases or the air intake increases, the density of the air-water mixture decreases sharply, Cavitation is generated in the negative pressure area, the vacuum degree in the negative pressure area decreases or even disappears, and there are large fluctuations, the air suction volume and suction and discharge volume also decrease and fluctuate violently, and the equipment also vibrates and is in an unstable operating state.

However, the structure of the self-priming gas-liquid mixing impeller can still be further improved to improve the performance of entrained air

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