Pumping unit for television tubes

摘要

A two stage pumping unit for evacuating tubes, and in particular television tubes. A primary mechanical pump is air-cooled and is connected in series with an oil diffusion pump. The inlet for the stem of a tube to be evacuated has a sealing ring and between the sealing ring and the diffusion pump there is a baffle. Between the two pumps there is an oil condensation device and an oil trap. The trap, the condensation device, the oil diffusion pump, the baffle and the sealing ring are arranged for cooling by forced air.