1、 Overview

The DS series (DS350, DS375, DS400) high-power inverted umbrella surface aerator has a novel and compact structure, smooth transmission, high oxygenation efficiency, low noise, and good process performance. Features such as easy installation and adjustment. The machine has strong flow pushing and mixing capabilities, and good oxygenation performance. It has a high cost-effectiveness and can replace imported products.

2、 Working principle

Under the strong propulsion of the inverted umbrella shaped impeller, water is thrown out from the edge of the impeller in the form of a water curtain, forming a water curtain that envelops a large amount of air; Due to the up and down circulation of sewage, the liquid level is constantly updated, and the sewage also comes into contact with air over a large area. The rotation of the impeller drives the flow of water, forming a negative pressure zone. When air is inhaled, oxygen in the air quickly dissolves into the sewage, completing the oxygenation of the sewage and accelerating the purification process of the sewage. At the same time, the powerful driving force stirs up a large amount of water flow, thereby achieving a pushing effect.

3、 Structure and Characteristics

The machine is mainly composed of an electric motor, coupling, gearbox, lubrication system, lifting platform, inverted umbrella seat, impeller and other parts. Structurally, it has the following characteristics:

The whole machine is a vertical structure, occupying a small area and not easily eroded by splashing sewage..

2. A vertical gearbox specially designed for the specific environment of the sewage treatment plant. The gears are made of alloy steel and ground into shape after heat treatment, with high precision, smooth operation, high transmission efficiency, and a designed service life of over ten years.

The impeller, which has been optimized and designed after hydraulic model verification, adopts an inverted umbrella shaped and straight blade structure, and has excellent oxygenation, flow pushing, stirring, and self-cleaning performance.

4. The lifting structure is flat, and the lifting platform is adjusted by screws to obtain different immersion depths of the impeller. The structure is simple and easy to adjust.

5. The connection between the umbrella shaft and the gearbox output adopts a floating shaft structure, which can achieve automatic centering and is easy to disassemble. At the same time, the floating shaft structure prevents the gearbox from being subjected to axial forces, avoiding vibration and noise caused by eccentric forces due to hydraulic imbalance during umbrella operation.

6. Configure a dual speed motor or variable frequency speed control device according to the user's needs to adjust the impeller speed, which can obtain the required oxygen filling amount for the process and save energy consumption.

7. For more detailed instructions, please refer to the accompanying technical documentation of the device.

5、 Design suggestions for aeration tank and oxidation ditch

(1) Ordinary aeration tank

The aeration tank can be circular or square, and the form and size are determined by the designer themselves. Suggestion:

A circular pool with a ratio of impeller diameter to aeration tank diameter of 1:4.5-7 (the median value should be taken). Square pool, with a ratio of impeller diameter to pool edge length of 1:4-7 (the median value should be taken). In principle, the water depth should be less than 1.5 times the diameter of the impeller, and the power density required for a fully mixed aeration tank should generally not be less than 25W/m3.

(2) Oxidation ditch

The width of the ditch is about 2.2-2.4 times the diameter of the impeller (the median value should be taken), and the working water depth is about 0.5 times the width of the ditch. The power density of the oxidation ditch should not be less than 15W/m3, and the appropriate power is 15W/m3.

be careful:

It is not advisable to set up columns in the oxidation ditch. If necessary, the distance from the column to the edge of the impeller should be greater than the diameter of the impeller and be cylindrical.

The distance between the partition wall in the oxidation ditch and the edge of the impeller should be 0.04 to 0.08 times the diameter of the impeller.

If no guide wall is installed at the aerator, the center distance of the inverted umbrella impeller should be 0.08 to 0.1 times the distance between the impellers in the direction of water outlet. The distance between the bottom of the working platform of the aerator and the design water surface should be greater than 800mm.