| 摘要 |
FIELD: analysis of materials by determining their chemical and physical properties, namely, preparing of samples for investigations by diluting, dispersing and mixing thereof. ^ SUBSTANCE: gas dynamic test stand has dosing device and gas dynamic unit for creating gas-and-vapor mixtures having predetermined concentration. Gas dynamic unit has reaction chamber for mixing of gas flows and dilution system. Reaction chamber is made in the form of gas-and-vapor mixture separator consisting of widener, which is connected with gas-and-vapor mixture flow meter and device for discharging said mixture through filter and dosing valve, as well as with dilution system through capillary and mixer of gas-and-vapor mixture separator. Gas flow regulators are positioned at dosing device inlet end and at inlet end of mixer of gas-and-vapor mixture separator. Dilution system has number of successively arranged stages, each consisting of widener, filter, mixer and capillary, whose diameter is defined from mathematic equation. Widener of each stage is communicating through filter with mixer of the same stage and is made in the form of capillary dilutor providing predetermined dilution coefficients for each stage. All basic units of stand, namely, dosing device, gas-and-vapor mixture separator, and dilution system are located in box wherein single temperature is maintained. ^ EFFECT: provision for producing of gas-and-vapor mixtures stable as to composition during prolonged time and referring to substances having different volatility. ^ 2 dwg |
