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6Endo Naoki, Yabe Akira, Yamashita Iwao, Helical liquid ring compressor for a steam compression heat pump: I. Concept and basic running characteristics [J]. Heat Transfer-Asian Research, 2000,29(8):660-673.
7Nelson R E.Vacuum Pump Aids Ejectors.Hydrocarbon Processing,1982,61(12):95-96.
8Endo Naoki,Yabe Akira,Yamashita Iwao.Helical Liquid Ring Compressor for a Steam Compression Heat Pump:I.Concept and Basic Running Characteristics.Heat Transfer-Asian Research,2000,29(8):660-673.