Overview In many modern industrial processes, such as vacuum filtration, vacuum water diversion, vacuum feed, vacuum evaporation, vacuum concentration, vacuum regurgitation and vacuum degassing, etc. are required to use the vacuum pump. Water ring vacuum pump as a simple structure, manufacturing accuracy is not high, environmental protection, the use of the environment is not harsh and has been people have valued. With the rapid development of vacuum application technology and the increase of application and technical improvement, the application of water ring vacuum pump will surely increase day by day. Water ring vacuum pump is a rough vacuum pump, usually people use water as a working medium, it is often referred to as the water ring pump. A water ring pump pushes water (liquid) toward the stator wall through an eccentric rotor that holds the blades inside. The water (liquid) forms a liquid ring that is concentric with the stator. The liquid ring and the rotor blades together form a variable volume rotary variable volume vacuum Device, it can get the ultimate vacuum of 2000 ~ 4000Pa, series atmosphere jet up to 270 ~ 670Pa. Water ring vacuum pump can also be used as a compressor, called the water ring compressor, is a low pressure compressor, the pressure range of 0.1 ~ 0.2MPa gauge pressure. Water ring vacuum pump was originally used as a self-priming pump, and then gradually used in petroleum, chemical, machinery, mining, light industry, medicine and food and many other industrial sectors. Principle Before starting the pump body is filled with an appropriate amount of water as a working fluid. When the impeller rotates clockwise in the direction indicated in the figure, the water is thrown around by the impeller. Due to the centrifugal force, the water forms a closed ring of approximately equal thickness depending on the shape of the pump chamber. The inner surface of the upper part of the water ring is just tangential to the impeller hub and the lower inner surface of the water ring is just in contact with the tip of the blade (in fact there is a certain insertion depth of the blade in the water ring). At this point the impeller hub and the water ring form a crescent-shaped space, and this space has been divided into a number of impeller leaves the same number of small cavities. If the upper part of the impeller 0 ° as a starting point, then the impeller at 180 ° before rotation when the small chamber volume from small to large, and the end of the suction port communicating, when the gas is inhaled, when the end of the inhalation chamber When the impeller continues to rotate, the small cavity becomes smaller and the gas is compressed; when the small chamber communicates with the exhaust port, the gas is discharged outside the pump. Features Advantages: simple structure, low manufacturing precision, easy processing; compact structure, high pump speed, generally with the motor direct connection, without deceleration device; compressed gas is basically isothermal, that is, the compressed gas process temperature changes Small; Because there is no metal friction surface in the pump cavity, there is no need to lubricate the pump, and the wear is very small; the seal between the rotating part and the fixing part can be directly completed by the water seal; the uniform air suction, the stable and reliable operation, Simple, easy maintenance; As water ring vacuum pump is compressed gas isothermal, it can be extracted flammable, explosive gas; Because there is no exhaust valve and the friction surface, it can be removed with the gas dust, condensable Gas and gas-water mixture. Disadvantages: low efficiency, generally about 30%, preferably up to 50%; low vacuum, not only because of the structural constraints, more importantly, the working fluid saturated vapor pressure limit. Water for the working fluid, the ultimate pressure can only reach 2000 ~ 4000Pa. Oil for the working fluid, up to 130Pa.
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