Patent ID: 7115186

Claim:
A liquid material evaporation apparatus, comprising: a source of carrier gas at a first pressure; a source of liquid material to be evaporated; a mixing chamber having a recessed region and a mixing groove providing a mixing of liquid material and the carrier gas; a flow control unit, operatively connected to the mixing chamber for controlling the flow of the liquid material into the mixing chamber; a heating unit for heating the mixing chamber so that mixing is enhanced; a first flow passage, connected to the source of liquid material and the mixing chamber, for introducing the liquid material, to the mixing chamber; a first nozzle; a second flow passage, connected to the source of carrier gas and the mixing chamber, for introducing the carrier gas, to the mixing groove through the first nozzle, the first nozzle having a flow area size for preventing backflow from the mixing groove into the second flow passage; a second nozzle; a third flow passage for discharging evaporated liquid material mixed with the carrier gas, connected to the mixing groove through the second nozzle, having a flow area smaller than an area of the third flow passage area, a flow rate of the mixed liquid material and carrier gas trough the second nozzle is controlled by the flow control unit at a second pressure, the mixed liquid material and carrier gas depressurizing after passing through the second nozzle to evaporate into a mixed gas in the third flow passage, the size of the first nozzle flow area and the relative pressures of the first pressure and the second pressure preventing a backflow of liquid material into the second flow passage.