The invention relates to a
system and a method for automatically measuring the property of a vapor
stream vacuum pump, which belong to the technical field of vacuum test. The invention can be in strict accordance with the test principle and the method specified in national and international standards to automatically complete the test of parameters of the vapor
stream vacuum pump. The
system comprises a test cover, a gas flow testing unit, a fore
pipe gas flow adjusting unit, and the like, wherein the gas flow testing unit comprises a dropper, a dropper
magnetic valve is arranged at a gas inlet of the upper part of the dropper, and the outer side of the dropper is provided with an upper liquid level switch and a lower liquid level switch; a test cover gas flow adjusting unit and the fore
pipe gas flow adjusting unit both comprise stepping motors,
needle type micrometering valves and high-vacuum magnetic valves, drive buttons of the
needle type micrometering valves are connected with the stepping motors, and gas outlets of the
needle type micrometering valves are connected with the high-vacuum magnetic valves; and the liquid level switches, the dropper
magnetic valve, and the like are connected with a
computer control unit. The measuring method comprises the following steps of measurement of
limit pressure of the vapor
stream vacuum pump, measurement of volume flow rate, and measurement of critical fore pressure.