膨(peng)脹節習(xi)慣上也(ye)叫補(bu)(bu)償(chang)(chang)(chang)器(qi)(qi)(qi)，或(huo)(huo)伸縮(suo)節。由(you)(you)構成(cheng)其(qi)工作(zuo)主(zhu)體(ti)的(de)(de)(de)(de)波(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)(一種彈性(xing)元件)和端管(guan)(guan)(guan)(guan)(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)等(deng)附(fu)件組成(cheng)。 膨(peng)脹節是為了(le)補(bu)(bu)償(chang)(chang)(chang)因溫(wen)度差(cha)與機械振動引起(qi)的(de)(de)(de)(de)附(fu)加應(ying)力，而設(she)置(zhi)在(zai)容器(qi)(qi)(qi)殼體(ti)或(huo)(huo)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上的(de)(de)(de)(de)一種撓性(xing)結(jie)構。利用(yong)其(qi)工作(zuo)主(zhu)體(ti)波(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)有(you)效伸縮(suo)變(bian)形，以吸(xi)收管(guan)(guan)(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容器(qi)(qi)(qi)等(deng)由(you)(you)熱(re)(re)脹冷縮(suo)等(deng)原因而產(chan)生的(de)(de)(de)(de)尺寸變(bian)化(hua)，或(huo)(huo)補(bu)(bu)償(chang)(chang)(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容器(qi)(qi)(qi)等(deng)的(de)(de)(de)(de)軸向、橫向和角向位移。也(ye)可用(yong)于(yu)降噪減(jian)振。供(gong)(gong)熱(re)(re)上，為了(le)防止供(gong)(gong)熱(re)(re)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由(you)(you)于(yu)熱(re)(re)伸長或(huo)(huo)溫(wen)度應(ying)力而引起(qi)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)形或(huo)(huo)破壞(huai)，需(xu)要(yao)在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上設(she)置(zhi)補(bu)(bu)償(chang)(chang)(chang)器(qi)(qi)(qi)，以補(bu)(bu)償(chang)(chang)(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)(de)(de)熱(re)(re)伸長，從而減(jian)小管(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)(de)(de)(de)應(ying)力和作(zuo)用(yong)在(zai)閥件或(huo)(huo)支架結(jie)構上的(de)(de)(de)(de)作(zuo)用(yong)力。