Reciprocating vacuum pump, rotary vane vacuum pump, sliding valve vacuum pump and Roots vacuum pump inhale, compress and discharge gas by reciprocating motion or rotation of piston. Their advantage is that the vacuum degree of the new pump is relatively high, but the piston is a running part, so the wear of the piston is inevitable. With the increase of maintenance times, the working vacuum degree will continue to decline until it can not meet the production requirements. This kind of pump has the disadvantage of high working noise, high fuel consumption and high failure rate. Generally, it needs to open a spare one.
This invisibly increases the cost of equipment investment and operation. In addition, if this kind of pump is used to pump water vapor and other condensable gases, the lubricating oil will be emulsified, so it can only be used to pump non condensable (air) gases, and it can not pump medium with particles, which limits its application scope.
The water ring vacuum pump is an eccentric rotor with multiple blades installed in the pump shell to rotate, throwing water to the pump shell to form a water ring concentric with the pump shell, and the water ring and the rotor blades form a periodic change of volume, so as to suction, compress and discharge the gas. It has the advantages of large suction capacity at low vacuum and direct suction of condensable gases such as water vapor. Its shortcomings are low vacuum, inability to suck granular media, high-speed rotation of the rotor is not easy to do anti-corrosion treatment, so it can not suck corrosive media.
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