Water vapor distillation apparatus, method and system

A water purification device comprising:

• an input for receiving source liquid;
• an evaporator coupled to the input for evaporating the source liquid to a vapor,
• a head chamber for collecting the vapor from the evaporator;
• a compressor receiving vapor from the head chamber and outputting compressed vapor, the compressor comprising:
• a rotor assembly with vanes;
• a casing around the rotor assembly and vanes;
• internal magnets mounted to the rotor assembly;
• and
• bearings supporting the rotor assembly;
• wherein the casing provides a hermetic seal around the rotor assembly and the rotor assembly is driven by magnetic forces acting through the casing,
• a condenser in communication with the compressor, wherein the compressed vapor condenses to form a distilled liquid product, wherein a portion of the distilled liquid product is directed to the compressor as a liquid lubricant in the compressor bearings, wherein a first portion of the liquid lubricant exits the compressor with the compressed vapor and enters the condenser, and a second portion of the liquid lubricant returns to a product reservoir in fluid communication with the condenser;
• and
• a heat exchanger that receives source liquid from the input, preheats the source liquid and delivers the source liquid to the evaporator.