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一、前言众所周知，膨胀节用途很广，就电站设备而言，一台大型火电机组的锅炉烟民造就有各种规格的膨胀节几十只，其作用是用来吸收管道受热而产生的热膨胀量。膨胀节可分为金属膨胀节和非金属膨胀节两类。在我国金属膨胀节的研究工作起步较早，生产单位较多，使用广泛。而非
First, the preamble As we all know, expansion joints are widely used, in terms of power plant equipment, a large-scale thermal power boiler boilers have created a variety of expansion joints dozens of its role is to absorb the heat generated by the pipe expansion the amount. Expansion joints can be divided into two types of metal expansion joints and non-metallic expansion joints. In our country metal expansion joint research work started earlier, more production units, widely used. Not