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Variable volume vacuum pump working principle and advantages and disadvantages
Variable volume vacuum pump working principle and advantages and disadvantages: (1) reciprocating vacuum pump, rotary vane vacuum pump, slide valve vacuum pump, Roots vacuum pump piston reciprocating motion or rotation of 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) The working principle of the water ring vacuum pump is to rotate the eccentric rotor with a plurality of blades installed in the pump casing to throw the water to the pump casing to form a water ring concentric with the pump casing. The water ring and the rotor blades form a volume cycle Variations take the gas in, compress it, and drain it. 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. The above is the variable-volume vacuum pump working principle and advantages and disadvantages.