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多年来,由于技术条件和工艺制做水平的限制,我国空气分离行业自制的透平膨胀机,大多数是按一元流动理论设计制造的。三元叶轮的设计与应用发展比较缓慢,尤其整体式叶轮更是如此。为了提高透平膨胀机的技术性能,缩小与国外先进水平的差距,我厂在最近研制的天然气透平膨胀机设计中,对风机端压缩叶轮采用了三元叶型的设计方法。并且对三元叶轮型面的机械加工方法进行了大量摸索和试验,总结出在普通铣床上,用自制仿形装置加工三元叶轮型面的可靠方法,从而找到了因地制宜提高技术水平的一条途径。
Over the years, due to technical conditions and process level restrictions, China’s air separation industry-made turbo expander, most of them are designed and manufactured according to the theory of one-dimensional flow. The design and application of ternary impeller development is relatively slow, especially impellers more so. In order to improve the technical performance of turbo-expander and narrow the gap with foreign advanced level, in the design of natural gas turbo-expander recently developed by our factory, the design method of ternary-leaf type is adopted for the compressor-side impeller. In addition, a great deal of exploration and experiment on the machining method of the ternary impeller surface were done. The author concluded that a reliable method of machining the ternary impeller surface with a self-made profiling device on a general milling machine was concluded, thus finding a way to improve the technological level according to the local conditions .