膨(peng)脹(zhang)節(jie)習(xi)慣上(shang)也(ye)叫補償器(qi)，或(huo)(huo)伸縮節(jie)。由構成其工作(zuo)主體的(de)(de)波紋(wen)管(guan)(guan)(guan)(guan)(一種彈性元(yuan)件)和(he)端管(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法蘭(lan)、導(dao)管(guan)(guan)(guan)(guan)等(deng)(deng)附件組成。 膨(peng)脹(zhang)節(jie)是為(wei)了補償因(yin)溫(wen)度差(cha)與機械振動引(yin)起(qi)的(de)(de)附加應(ying)(ying)力(li)(li)，而(er)(er)設置在(zai)容(rong)(rong)(rong)器(qi)殼體或(huo)(huo)管(guan)(guan)(guan)(guan)道上(shang)的(de)(de)一種撓性結構。利用(yong)其工作(zuo)主體波紋(wen)管(guan)(guan)(guan)(guan)的(de)(de)有效(xiao)伸縮變形(xing)，以吸收管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容(rong)(rong)(rong)器(qi)等(deng)(deng)由熱(re)(re)脹(zhang)冷縮等(deng)(deng)原因(yin)而(er)(er)產生(sheng)的(de)(de)尺寸變化，或(huo)(huo)補償管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容(rong)(rong)(rong)器(qi)等(deng)(deng)的(de)(de)軸向(xiang)、橫向(xiang)和(he)角向(xiang)位移。也(ye)可用(yong)于(yu)降噪(zao)減(jian)振。供(gong)熱(re)(re)上(shang)，為(wei)了防止供(gong)熱(re)(re)管(guan)(guan)(guan)(guan)道升(sheng)溫(wen)時(shi)，由于(yu)熱(re)(re)伸長(chang)或(huo)(huo)溫(wen)度應(ying)(ying)力(li)(li)而(er)(er)引(yin)起(qi)管(guan)(guan)(guan)(guan)道變形(xing)或(huo)(huo)破壞，需要在(zai)管(guan)(guan)(guan)(guan)道上(shang)設置補償器(qi)，以補償管(guan)(guan)(guan)(guan)道的(de)(de)熱(re)(re)伸長(chang)，從而(er)(er)減(jian)小管(guan)(guan)(guan)(guan)壁的(de)(de)應(ying)(ying)力(li)(li)和(he)作(zuo)用(yong)在(zai)閥件或(huo)(huo)支(zhi)架(jia)結構上(shang)的(de)(de)作(zuo)用(yong)力(li)(li)。