膨(peng)(peng)脹(zhang)節(jie)習慣上(shang)也叫(jiao)補償器(qi)(qi)，或伸(shen)縮(suo)(suo)節(jie)。由(you)構成其(qi)工作(zuo)主(zhu)體(ti)的波(bo)紋管(guan)(guan)(guan)(guan)(一種彈性(xing)元件)和端管(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導(dao)管(guan)(guan)(guan)(guan)等(deng)附(fu)件組(zu)成。 膨(peng)(peng)脹(zhang)節(jie)是為(wei)了補償因(yin)溫度(du)差與機械振動引起的附(fu)加應(ying)(ying)力(li)，而(er)設(she)置在容(rong)(rong)器(qi)(qi)殼體(ti)或管(guan)(guan)(guan)(guan)道(dao)上(shang)的一種撓性(xing)結構。利用(yong)(yong)其(qi)工作(zuo)主(zhu)體(ti)波(bo)紋管(guan)(guan)(guan)(guan)的有效(xiao)伸(shen)縮(suo)(suo)變形，以吸(xi)收管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容(rong)(rong)器(qi)(qi)等(deng)由(you)熱(re)(re)脹(zhang)冷縮(suo)(suo)等(deng)原因(yin)而(er)產生的尺寸變化，或補償管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容(rong)(rong)器(qi)(qi)等(deng)的軸向、橫向和角向位移。也可用(yong)(yong)于降噪減(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(dao)升溫時，由(you)于熱(re)(re)伸(shen)長或溫度(du)應(ying)(ying)力(li)而(er)引起管(guan)(guan)(guan)(guan)道(dao)變形或破壞(huai)，需要在管(guan)(guan)(guan)(guan)道(dao)上(shang)設(she)置補償器(qi)(qi)，以補償管(guan)(guan)(guan)(guan)道(dao)的熱(re)(re)伸(shen)長，從而(er)減(jian)小管(guan)(guan)(guan)(guan)壁的應(ying)(ying)力(li)和作(zuo)用(yong)(yong)在閥件或支(zhi)架結構上(shang)的作(zuo)用(yong)(yong)力(li)。