膨(peng)脹(zhang)(zhang)節習慣上也(ye)叫補償(chang)器(qi)，或伸(shen)(shen)(shen)縮(suo)節。由(you)構成(cheng)其工(gong)作主體(ti)的(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)(一種彈性元件(jian))和(he)端管(guan)(guan)(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法蘭(lan)、導管(guan)(guan)(guan)(guan)(guan)(guan)等(deng)附件(jian)組成(cheng)。 膨(peng)脹(zhang)(zhang)節是為(wei)了補償(chang)因溫(wen)(wen)度(du)差(cha)與機械振動(dong)引(yin)起(qi)的(de)(de)附加(jia)應(ying)力(li)，而設置在(zai)容(rong)器(qi)殼體(ti)或管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上的(de)(de)一種撓(nao)性結(jie)構。利用(yong)(yong)其工(gong)作主體(ti)波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)有效(xiao)伸(shen)(shen)(shen)縮(suo)變(bian)形(xing)，以吸收管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)由(you)熱(re)脹(zhang)(zhang)冷縮(suo)等(deng)原因而產(chan)生(sheng)的(de)(de)尺寸變(bian)化，或補償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)的(de)(de)軸向(xiang)、橫向(xiang)和(he)角向(xiang)位移(yi)。也(ye)可用(yong)(yong)于(yu)降噪減振。供熱(re)上，為(wei)了防(fang)止供熱(re)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)(wen)時，由(you)于(yu)熱(re)伸(shen)(shen)(shen)長或溫(wen)(wen)度(du)應(ying)力(li)而引(yin)起(qi)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)形(xing)或破壞(huai)，需要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上設置補償(chang)器(qi)，以補償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱(re)伸(shen)(shen)(shen)長，從而減小管(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應(ying)力(li)和(he)作用(yong)(yong)在(zai)閥件(jian)或支(zhi)架(jia)結(jie)構上的(de)(de)作用(yong)(yong)力(li)。