Patent ID: 9175688
Filing Date: 2015-11-03
Classification: F04C,F04D,F04F

Abstract:
1. In a system comprising a load lock vacuum chamber and a pumping device, said pumping device comprising: a conduit having first and second opposing ends; a dry rough vacuum pump including a gas inlet orifice coupled to the load lock vacuum chamber, and a gas outlet orifice adapted to couple to a first end of the conduit; a discharge check valve placed within the conduit; and an ejector placed parallel in relation to the discharge check valve, said ejector comprising: an ejector-controlling apparatus having at least one input and an output with a first one of the ejector-controlling apparatus inputs adapted to couple to the gas outlet orifice, said ejector-controlling apparatus configured to measure pressure of gas in the first end of the conduit and electric power consumed by the dry rough vacuum pump and, in response to the measured gas pressure and the measured electric power,