Water ring vacuum pump is the most common type of liquid ring vacuum pump. Liquid ring vacuum pumps are multi-bladed rotors mounted eccentrically in the pump housing. As it rotates, the liquid is thrown against the pump housing and forms a liquid ring concentric with the pump housing. The liquid ring forms a rotationally-variable volumetric vacuum pump of variable volume with the rotor blades. When the working fluid is water, water ring vacuum pump. Water ring vacuum pump is mainly used for rough vacuum, pumping large amount of process. In the chemical, petroleum, light industry, medicine and food industry has been widely used, such as vacuum filtration, vacuum feeding, vacuum concentration, vacuum degassing. Single-stage water ring pump ultimate pressure up to 8 ~ 2 × 103Pa, two-stage water ring pump ultimate pressure up to 1 × 102Pa, displacement of 0.25 ~ 500m3 / h. Water ring pump wheel rotation in the pump body formed when the water ring and studio. Water ring and the working wheel form a crescent-shaped space. Right half of the crescent-shaped volume from small to large, forming a suction chamber. The left half of the crescent-shaped volume from larger to smaller, constitute the compression process (equivalent to the exhaust chamber). Exhaust gas from the intake pipe and intake into the suction chamber. Rotor further rotation, so that the compressed gas through the exhaust port and the exhaust pipe. Exhaust gases and water droplets from the exhaust pipe into the tank, then the gas separated from the water, the gas pipelines to the atmosphere, the water from the tank into the pump, or discharged to the drainage pipe 11. Water ring pump compression ratio by the suction end of the pump position and the exhaust port to determine the starting position. Since the end of the suction port determines the volume of gas sucked in by the suction chamber, the starting position of the vent determines the volume of compressed gas during venting. For a water ring pump that has been dimensioned, the compression ratio can be found. Advantages: simple structure, low manufacturing precision, easy processing. Simple operation, easy maintenance. Compact structure, the pump is generally connected directly with the motor, higher speed. With a smaller structure size, you can get a larger displacement. There is no metal friction surface of the pump cavity, no lubrication of the pump. Sealing between the rotating part and the fixing part can be completed by the water seal directly. Compressor gas pump chamber temperature change is small, can be considered isothermal compression, it can be extracted flammable and explosive gases. Because there is no exhaust valve and friction surface, it can be removed with the dust gas, condensable gas and gas-water mixture. Disadvantages: low efficiency, generally about 30%, preferably up to 50%. Low vacuum. This is not only due to the structural limitations, but more importantly, the saturated vapor pressure of the working fluid. Overall, the water ring vacuum pump has isothermal compression and water for sealing liquid, you can remove flammable, explosive and corrosive gases, but also can remove the dust and moisture containing gas and other outstanding advantages, so get a wide range of application.