Water ring vacuum pump according to different structures can be divided into the following types: Single-stage single-action water ring pump single stage is only one impeller, a single role refers to the impeller every rotation, inhalation, exhaust once. The pump has a higher ultimate vacuum but lower pumping speed and efficiency. Single-stage double-acting water ring pump single stage refers to only one impeller, double effect refers to the impeller every rotation, inhalation, exhaust twice. In the same pumping speed conditions, double-acting water ring pump than the single-action water ring pump greatly reduce the size and weight. Since the working chambers are symmetrically distributed on both sides of the pump hub, the load acting on the rotor is improved. Pump pumping speed larger, higher efficiency, but the lower limit of the vacuum. Two-stage water ring pumps Two-stage water ring vacuum pumps are mostly single-acting pumps in series. Essentially two single-stage single-role water ring pump impeller shared a mandrel. Its main feature is still in a higher degree of vacuum, there is still a large pumping speed, and stable working conditions. Atmospheric water ring pump is actually a series of atmospheric water jet pump unit. Water ring pumps in series in front of the pump is to increase the ultimate vacuum, expanding the use of the pump. Water ring vacuum pump and other types of mechanical vacuum pump compared to the following 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. The seal 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. Water ring vacuum pump also has its drawbacks: 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 a wide range of application.
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