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一、前言众所周知,要进行大规模工业生产的自动化控制,首先要有灵敏可靠的检测元件以产生第一组信号;此外还要有灵敏可靠的执行元件以完成各项自动化调节和控制。诸如此类的一些元件如:变送器中的膜片、膜盒、弹簧管和波纹管;压力表中的弹簧管等弹性敏感元件;流量计中的叶轮和轴承以及调节阀中的阀芯阀座、各种弹簧等。它们都是仪器仪表的核心部件。在石油化工,冶金,原子能工业以及海洋开发事业等各部门的自控仪表系统中,这些检测元件和执行元件直接和各种腐蚀性介质相接触,除了遭受介质的
First, the preamble As we all know, to carry out large-scale industrial automation control, we must first have sensitive and reliable detection components to produce the first set of signals; In addition there are sensitive and reliable implementation of the components to complete the automation and control. Some of these components are: diaphragms, bellows, spring tubes and bellows in transmitters; spring-sensitive elements such as spring-loaded pressure gauges; impellers and bearings in flow meters and valve seats in regulating valves , All kinds of springs and so on. They are all the core components of instrumentation. In the petrochemical, metallurgy, atomic energy industry and marine development and other departments of self-control instrumentation systems, these detection elements and actuators in direct contact with a variety of corrosive media, in addition to suffering from the media