膨(peng)脹節習慣上也(ye)叫補(bu)償器(qi)，或(huo)伸縮節。由(you)構(gou)成其工(gong)作(zuo)(zuo)主(zhu)體的(de)波(bo)紋(wen)(wen)管(guan)(guan)(guan)(一種彈性(xing)元(yuan)件)和端管(guan)(guan)(guan)、支架、法(fa)蘭、導(dao)管(guan)(guan)(guan)等(deng)(deng)附件組成。 膨(peng)脹節是為(wei)了(le)補(bu)償因溫(wen)(wen)度差與(yu)機械振動引起的(de)附加應(ying)力(li)，而設置(zhi)在容(rong)(rong)器(qi)殼體或(huo)管(guan)(guan)(guan)道(dao)(dao)上的(de)一種撓性(xing)結構(gou)。利用其工(gong)作(zuo)(zuo)主(zhu)體波(bo)紋(wen)(wen)管(guan)(guan)(guan)的(de)有效伸縮變(bian)(bian)形，以吸收管(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)、容(rong)(rong)器(qi)等(deng)(deng)由(you)熱脹冷縮等(deng)(deng)原(yuan)因而產生的(de)尺寸變(bian)(bian)化，或(huo)補(bu)償管(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)、容(rong)(rong)器(qi)等(deng)(deng)的(de)軸向、橫向和角向位(wei)移(yi)。也(ye)可用于降噪減(jian)振。供(gong)熱上，為(wei)了(le)防止(zhi)供(gong)熱管(guan)(guan)(guan)道(dao)(dao)升溫(wen)(wen)時，由(you)于熱伸長或(huo)溫(wen)(wen)度應(ying)力(li)而引起管(guan)(guan)(guan)道(dao)(dao)變(bian)(bian)形或(huo)破壞，需要在管(guan)(guan)(guan)道(dao)(dao)上設置(zhi)補(bu)償器(qi)，以補(bu)償管(guan)(guan)(guan)道(dao)(dao)的(de)熱伸長，從(cong)而減(jian)小管(guan)(guan)(guan)壁的(de)應(ying)力(li)和作(zuo)(zuo)用在閥(fa)件或(huo)支架結構(gou)上的(de)作(zuo)(zuo)用力(li)。