Design And Research Of The Propeller Aerator

At present, fisheries, industry and other fields widely used oxygen increasing machine efficiency is low in dissolved oxygen, water stirring water area is smaller and aerated water area is limited, the design with high oxygen dissolving efficiency, water stirring area is large, the dissolved oxygen diffusion speed, water fast uniform oxygenation large propeller aerator. The design in the fishery, industry has a high application value and prospect, its innovation lies in the air will be broken into tiny high density spray bubble spread to the water in the lower, increase the gas liquid mass transfer interface, so that air can be fully mixed with water, at the same time, a large number of negative ions generated bubbles when, play to fully dissolved oxygen and water purification effect; secondly, can form a simulation of the ecological flow, the water is sent to every corner of the body of water, stagnant water into running water; the main one is that he can realize intelligent control, both to reduce the labor intensity of the workers, but also promote oxygenation function exert the maximum effect, the aquaculture to increase income.At present, in the aquaculture industry is widely used in impeller type, water type, water jet and jet aerator, aerator in these kinds of oxygen can play a certain effect, But more than a few aerator in some aspects of some deficiencies. For example the impeller oxygen increase machine noise is big, the waterwheel type oxygen increasing machine and jet aerator for market share is relatively small, the former is mainly used in shrimp, eel and other aquatic products breeding, the latter mainly in special aquatic products breeding and application in factory farming is more, main defects performed in aerobic capacity and power efficiency of poor efficacy.Propeller type aerator is in above several aeration machine based on, first by making full use of the aerator on mechanical agitate the water, in order to promote water bottom oxygen and high oxygen exchange and upper and lower interface update; second is through the use of a component or the principle of water dispersed into small droplets, thus increasing gas liquid contact area; the last is produced through negative pressure suction, the inhaled gas dispersion for a plurality of micro bubble, pressed into the water, so as to achieve the effect of aerobics. It is the principle of air through the negative pressure generated by high-speed rotation of the propeller into the water, and in high speed under the impact of the water current is broken into tiny dense fog bubble spread to the water in the middle and lower, so, it greatly increases the gas liquid mass transfer interface, and makes the air bubbles in the water to stay longer, dissolved oxygen time increases, the air can be fully mixed with water, at the same time, the bubbles generated when a large amount of negative ions, the dissolved oxygen and water purification effect. On the other hand, because of the strong thrust of propeller water flow oxygen, can be sent to a distance of35meter of water, forming dynamic oxygen flow around in the water, large flow through unsaturated flow in contributing to both water efficient oxygen exchange, and Simulation of the formation of ecological flow, the water is sent to every corner of the body of water, stagnant water into living water.The main content of this thesis is divided into seven chapters to expound it.The first chapter is the introduction. This part briefly introduces spiral aerator design background, as well as the design of the purpose and significance, and then simply narrated the current market several aerator shortcomings and deficiencies, and expounds the research work principle and main content.The second chapter is the present market with the introduction of the oxygen increasing machine. Its main contents include:oxygen increasing machine in industry, fishery and other applications, the importance of mechanical aerator, aerator in the promotion of the role of water circulation, oxygen increasing machine to improve the reservoir bottom soil applications, existing problems and development direction.The third chapter mainly discusses the current market with the aerator type and scope of application, introduced with emphasis the impeller oxygen increase machine, the waterwheel type oxygen increasing machine, spray type oxygen increasing machine, inflatable aerator, jet aerator body characteristics, working principle, application scope and advantages and disadvantages.The fourth chapter introduces the propeller aerator. First it introduces the basic structure and working principle, it is composed of a motor, a buoy, adjusting bracket, a hollow shaft, the bearing sleeve, dome, propeller and a guiding tube is composed of eight parts. Then it introduces the characteristics and application field.The fifth chapter is the propeller aerator design calculation. This chapter is the core part of this article, discusses the choice of motor, the calculation of propeller, hollow shaft sealing ring calculation, selection, choice of stent, propeller and a hollow shaft and a guide pipe connection and propeller type oxygen increasing machine intelligent control. The intelligent control part is innovation. The aeration control box by a controller, sensor, external contacts and external alarm. The control box has the advantages of simple installation, convenient operation, and can intuitively set, lower, when dissolved oxygen below the lower limit of automatic oxygen-increasing machine start, when oxygen is higher than the upper limit stop automatically when the aerator, avoidance of hypoxia and blind oxygenation. Aeration control box is suitable for all kinds of fish, shrimp ponds continuous dissolved oxygen measurement and oxygen-increasing machine automatic control. The control board is mainly for field detection of dissolved oxygen, motor running state detection and automatic completion of the motor start stop control. The scene dissolved oxygen quantity signal isolation to the MCU AD sampling unit, realizes to the oxygen content signal acquisition, and through digital tube display real-time oxygen content. The user can be achieved through the key motor manual start-stop, dissolved oxygen content setting, self diagnosis function, can set the buttonl to4different periods of time to cross or loop automatic control oxygen, reasonable setting, to save time, energy saving, improve the efficiency of.The sixth chapter mainly introduces the propeller aerator is the rational use of the. Is summed up to do "six three on the". That is," six":(1) the sunny day afternoon2-3points starting, starting one hour;(2) it is cloudy in the morning7,8up, starting one hour;(3) a rainy nightO-2when starting, need about starting two hours;(4) in a heavy rainstorm at22-24about starting up, starting two hours;(5) large temperature difference as the case timely boot [7];(6) special case as the case to boot." Three without":(1) the morning after the sunrise (each place is different, as the case may be) not boot;(2) the evening should not start; (3) weather of overcast and rainy day not boot.The seventh chapter introduces the propeller type oxygen increasing machine installation, operation, maintenance and maintenance. To ensure that the use of the process can be safe operation, and can correct maintenance and maintenance, in order to prolong its service life, make its utmost for our work, improve economic benefits.