(1) Reciprocating vacuum pump , rotary vane vacuum pump , slide valve vacuum pump, Roots vacuum pump is the piston reciprocating or rotating the gas inhalation, compression and discharge. Their advantage is that the new pump has a relatively high degree of vacuum, but the piston is a running part, so piston wear can not be avoided, as the number of maintenance increases the working vacuum will continue to decline until it can not meet the production requirements. Such pumps work noise, fuel consumption, high failure rate is also a fatal shortcoming, generally need to open a spare one, which virtually increases the equipment investment and operating costs. In addition, if such a pump is used to suck a condensable gas such as steam to emulsify the lubricating oil, it can only be applied to suction of non-condensable (air-based) gas or to suction of a granular medium It also limits its scope of application.
(2) water ring vacuum pump is installed in the pump housing with a multi-vane eccentric rotor rotation, the water thrown into the pump housing to form a concentric water ring with the pump, the water ring and the rotor blades to form a volume cycle so that the Gas is drawn in, compressed and drained. It has the advantage of low vacuum pumping capacity, you can directly suction steam condensable gas. Its disadvantage is the low degree of vacuum; can not be aspirated with the granular media; rotor rotation is not easy to do anti-corrosion treatment, it can not be aspirated with corrosive media.
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