A proper amount of water is used as working fluid in the multi-stage pump body. When the impeller rotates in a clockwise direction, the water is thrown to the periphery of the impeller, because of the centrifugal force, the water forms a closed circular ring, which is determined by the shape of the pump cavity. The next part of the water ring coincided with the inner surface of the impeller hub tangent to the inner surface of the upper part of the water ring coincides with the leaves of the top contact (actually leaves into a certain depth in the water ring). At this time between the impeller wheel and the water ring to form a crescent shaped space, and this space has been divided into several small impeller blades and equal to the number of.
If the lower impeller 0 degrees as the starting point, then the volume of the impeller rotating 180 degrees in front of the cavity from small to large, and communicated with the end face of the suction port, then the gas is inhaled, when the suction end of the cavity is isolated from the suction port; when the impeller continues to rotate, the cavity from big to small, make the gas is compressed; when the cavity communicates with the exhaust port, the gas will be discharged out of the pump. In summary, multistage pump is a pump chamber volume by the change to achieve soft pump suction, compression and exhaust, so it can change the size of the centrifugal pump. Multi stage pumps can be used in petroleum, chemical, machinery, mining, light industry, medicine and food and many other industrial sectors. In many industrial production processes, such as vacuum filter, vacuum water, vacuum feed, vacuum evaporation, vacuum evaporation, vacuum degassing and vacuum resurgence, etc., widely used in multistage pump. Can be pumped in addition to flammable, explosive gas, in addition to smoke and dust, water containing gas, therefore, the application of water ring pump is increasing.
