Steam produced in the heating chamber with a large amount of liquid foam, to the larger space after the evaporation chamber, these liquids by their own condensation or the role of the defoaming device and so on can be separated from the vapor. Usually the foam remover is arranged at the top of the evaporation chamber.
According to operating pressure, the evaporator is divided into 3 kinds, pressure and decompression. According to the solution in the evaporator in the movement of the status of: ① circulation type. Boiling solution in the heating chamber several times through the heating of the surface, such as central circulation tube type, suspended basket type, outside heat type, Levin type and forced circulation type. ② one-way type. Boiling solution in the heating chamber at one time through the heating surface, do not make the circulation flow, the discharge of concentrated liquid, such as rising film type, falling film type, stirring film type and centrifugal film type. ③ direct contact type. Heating medium and solution directly contact heat transfer, such as submerged combustion evaporator. Evaporation device in the operation process, to consume a large number of heating steam, in order to save heating steam, can use a multiple-effect evaporation device and steam-compression evaporator. Evaporator is widely used in chemical industry, light industry and other departments.
The evaporator used in medicine is vaporizer, and the volatile inhalation anesthetics are liquid at room temperature. The evaporator can effectively evaporate the volatile anesthetic liquid into gas and can accurately adjust the concentration of the anesthetic vapor output. The evaporation of the anesthetic requires heat, and the temperature around the evaporator is the main factor determining the evaporation rate of the volatile narcotic drug. The modern anesthesia machine widely uses the temperature one flow compensation type evaporator, namely in the temperature or the fresh gas flow change, can through the automatic compensatory mechanism to maintain the volatile inhalation narcotic drug evaporation speed to be constant, thus guarantees the inhalation narcotic drug to leave the evaporator output concentration to be stable. Because of the different physical characteristics of the boiling point and saturated vapor pressure of different volatile inhalation anesthetics, the evaporator has special drug specificity, such as Halothane evaporator, isoflurane evaporator, etc. The evaporator of the modern anesthesia machine is placed outside the anesthesia breathing circuit, there is a separate oxygen flow to connect with it, and the inhalation anesthetic vapor is mixed with the main airflow before the inhalation of the patient.