High-efficiency self-priming centrifugal submersible aerator

Abstract

The invention relates to sewage treatment equipment, particularly a self-priming centrifugal submersible aerator. The invention aims to provide a high-working-reliability high-efficiency self-priming centrifugal submersible aerator. According to the submersible aerator, a drive shaft of a submersible motor is connected with impellers positioned in the inner cavity of an aeration tray; the upper end of the aeration tray is provided with an air inlet, and the lower end is provided with a water inlet; and the periphery of the aeration tray is provided with a flow channel for discharging a water-air mixture into water. The invention is characterized in that the flow channel on the periphery of the aeration tray is arranged obliquely downwards. Preferably, the outlet of the flow channel is connected with a plurality of injection pipes, and the injection pipes are regularly arranged on the periphery of the aeration tray according to lengths. The submersible motor is arranged below the aeration tray. By adopting the technical scheme of the invention, the flow channel in the aeration tray is obliquely downwards instead of horizontal, so that the injected water-air mixed fluid can stir the sludge on the tank bottom, thereby preventing the sludge from settling.

Description

technical field [0001] The invention relates to sewage treatment equipment, in particular to a self-priming centrifugal submersible aerator. Background technique [0002] The self-priming centrifugal submersible aerator is a special equipment for aerating and oxygenating water bodies in the water treatment process. Its working principle is: the transmission shaft of the submersible motor directly drives the semi-open impeller built in the aeration disc to rotate at high speed, and high pressure is generated under the action of the centrifugal force of the rotating impeller, and the air and water are respectively fed from the upper and lower ends of the aeration disc. The mouth is sucked; the impeller communicates with the air inlet pipe leading to the water, and introduces air. There are multiple flow channels around the aeration plate. The water and air mixture enters the flow channel and is fully mixed, then sprays out at high speed in the radial direction from the outlet...

AI Technical Summary

Problems solved by technology

[0005] The disadvantages of these two structures are: when the high-speed air passes through the pipe elbow or the air chamber, additional resistance will be generated, which will cause the loss of the negative pressure head of the intake air, reduce the intake air volume, and reduce the aeration efficiency of the aerator.

A large number of small bubbles in the ring-shaped bubble belt will quickly merge and become larger due to the inability to diffuse in time, causing a sharp decrease in the surface area of ​​the bubbles, resulting in a decrease in the efficiency of dissolved oxygen in water

At the same time, as the diameter of a single bubble increases, its buoyancy in the water increases, which speeds up the rising speed of the bubbles, reduces the residence time of the bubbles in the water, and also reduces the efficiency of dissolved oxygen in water.

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