膨(peng)(peng)脹(zhang)節(jie)(jie)習慣上(shang)也叫補(bu)償(chang)(chang)器(qi)，或(huo)(huo)伸縮節(jie)(jie)。由(you)構(gou)成(cheng)其(qi)工(gong)作(zuo)主體的(de)(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)(一種(zhong)彈性(xing)元件(jian))和(he)端管(guan)(guan)(guan)(guan)(guan)(guan)、支(zhi)(zhi)架、法蘭、導管(guan)(guan)(guan)(guan)(guan)(guan)等(deng)附件(jian)組成(cheng)。 膨(peng)(peng)脹(zhang)節(jie)(jie)是為了補(bu)償(chang)(chang)因溫(wen)度差與機(ji)械振動(dong)引起的(de)(de)(de)附加(jia)應(ying)力(li)，而(er)設置在(zai)(zai)容(rong)器(qi)殼體或(huo)(huo)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)的(de)(de)(de)一種(zhong)撓性(xing)結(jie)構(gou)。利用(yong)(yong)其(qi)工(gong)作(zuo)主體波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)有效(xiao)伸縮變(bian)形，以吸收(shou)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)冷縮等(deng)原因而(er)產生的(de)(de)(de)尺(chi)寸變(bian)化(hua)，或(huo)(huo)補(bu)償(chang)(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)(de)軸向、橫向和(he)角向位移。也可用(yong)(yong)于(yu)降噪減(jian)振。供熱(re)上(shang)，為了防止供熱(re)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升(sheng)溫(wen)時，由(you)于(yu)熱(re)伸長(chang)(chang)或(huo)(huo)溫(wen)度應(ying)力(li)而(er)引起管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)形或(huo)(huo)破壞，需要在(zai)(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)設置補(bu)償(chang)(chang)器(qi)，以補(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)(de)熱(re)伸長(chang)(chang)，從(cong)而(er)減(jian)小(xiao)管(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)(de)(de)應(ying)力(li)和(he)作(zuo)用(yong)(yong)在(zai)(zai)閥件(jian)或(huo)(huo)支(zhi)(zhi)架結(jie)構(gou)上(shang)的(de)(de)(de)作(zuo)用(yong)(yong)力(li)。