螺旋吸气式增氧机的结构设计

根据旋转体在水中高速旋转时形成的负压、吸入空气，在涡流剪切力作用下，产生微小气泡，组成气水混合体的原理，选型设计了螺旋吸气式增氧机。其主要结构由螺旋器、扩散器、空心轴、电动机等部件组成。其设计技术参数为：增氧动力效率０．６１ｋｇ／ｋｗ·ｈ；混合速度７００ｍ２ｍ／ｋｗ．ｈ；吸气量３０ｍ３／ｈ；工作噪音６０ｄＢ；电机功率０．７５～２．２ｋｗ；单机负荷水面５３０～１６６６．７ｍ２．经生产单位试用，取得明显增产效果。

CONSTRUCTION DESIGN OF THE PROPELLER ASPIRATING AERATOR

Based on the comparison of aerator of different types, to meet the demand of high density aquaculture for both sea and fresh waters, the propeller aspirating aerator is designed. Its principle is that when an object spinning at a high speed in water, a region with negative pressure will be formed, which sucks in air; under the action of shear force, tiny air bubbles are produced and an air-water mixture will be formed. The aerator consists of a propeller, a diffuser, a hollow axle and a motor. A number of technical performance tests shows that its dissolve oxygen efficiency is 0. 61 kg/kw. h, mixture speed 1. 05 mu. m/kw. h, quantity of aspirate gas 30 m3/h, motor rotational speed 2840 r. p. m, propeller diameter 100 mm, length of diffuser 40-60 mm, load of single machine 530- 1666. 7 m2. It can produce tiny foggy air bubbles in middle and lower -layer waters, and can form water circulation. The machine, which is simple in structure, light in weight, low in noise level, is capable of higher yield as proved by trials conducted in production units.