Solar medium-temperature flash evaporation seawater desalination system

The utility model aims to provide a solar medium-temperature flash evaporation seawater desalination system which mainly comprises a compound paraboloid condensation heat collector, a pressure barrel, a pressure release valve, a pressure regulating valve, a safety valve, a flow control valve, a vortex shedding flowmeter, a PT100 armored thermal resistor, a condenser, a vacuum pump, a fresh water collecting tank, a gas-liquid separator, a flash evaporation chamber, a nozzle, a booster water pump and a heat exchanger, and a circulating oil pump. The compound paraboloid condensation heat collector heats heat conduction oil to serve as a driving heat source, the heat exchanger is placed in a sealed pressure barrel, seawater in the pressure barrel is continuously and circularly heated, the temperature of the seawater is increased, meanwhile, the pressure in the barrel is increased, and a pressure difference is formed between the barrel and the flash chamber in negative pressure, so that high-temperature seawater i