膨(peng)脹(zhang)節習(xi)慣上(shang)(shang)也叫補(bu)償器(qi)，或(huo)伸(shen)(shen)(shen)縮節。由(you)構(gou)成(cheng)其(qi)工作主(zhu)體的(de)(de)(de)波紋管(guan)(guan)(guan)(guan)(guan)(guan)(一種彈性元件(jian)(jian)(jian))和(he)端管(guan)(guan)(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法蘭、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)等(deng)(deng)附件(jian)(jian)(jian)組成(cheng)。 膨(peng)脹(zhang)節是為了補(bu)償因溫(wen)度(du)差(cha)與機械振動引起的(de)(de)(de)附加應力(li)，而(er)(er)設置在(zai)(zai)容(rong)器(qi)殼體或(huo)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)的(de)(de)(de)一種撓性結構(gou)。利用(yong)其(qi)工作主(zhu)體波紋管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)有效伸(shen)(shen)(shen)縮變形(xing)(xing)，以吸(xi)收管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)(deng)由(you)熱(re)脹(zhang)冷縮等(deng)(deng)原(yuan)因而(er)(er)產(chan)生的(de)(de)(de)尺寸變化，或(huo)補(bu)償管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)(deng)的(de)(de)(de)軸向、橫向和(he)角向位移。也可用(yong)于降噪減(jian)振。供(gong)熱(re)上(shang)(shang)，為了防(fang)止供(gong)熱(re)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)時(shi)，由(you)于熱(re)伸(shen)(shen)(shen)長(chang)(chang)或(huo)溫(wen)度(du)應力(li)而(er)(er)引起管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變形(xing)(xing)或(huo)破壞(huai)，需要(yao)在(zai)(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)設置補(bu)償器(qi)，以補(bu)償管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)(de)熱(re)伸(shen)(shen)(shen)長(chang)(chang)，從而(er)(er)減(jian)小管(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)(de)(de)應力(li)和(he)作用(yong)在(zai)(zai)閥件(jian)(jian)(jian)或(huo)支(zhi)架(jia)結構(gou)上(shang)(shang)的(de)(de)(de)作用(yong)力(li)。