The single pump of oil-free dry screw vacuum pump with variable pitch can be pumped to 1PA (absolute pressure) from atmospheric pressure. Its internal variable pitch has realized the function of vacuum unit.
When the water ring vacuum pump runs for a long time, the water temperature rises slowly, which directly causes the vacuum degree of the water ring vacuum pump to drop. It is necessary to use refrigerated brine to cool the water tank of the liquid ring vacuum pump, so as to increase the use power of the motor and increase energy consumption. Moreover, if the low boiling solvent extracted from the system but not condensable is introduced into the water body of the water ring vacuum pump, the vacuum degree of the water ring pump will also be reduced.
Oil-free dry variable pitch screw vacuum pump can operate stably for a long time without the influence of water temperature and extraction solvent. (The interior is basically self-cleaning)
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