膨(peng)脹節習慣上(shang)(shang)也(ye)叫補償器，或(huo)(huo)(huo)(huo)伸縮節。由構(gou)成(cheng)其(qi)工(gong)作(zuo)主體的(de)波紋(wen)管(guan)(guan)(guan)(guan)(guan)(一種(zhong)彈(dan)性(xing)元件)和端管(guan)(guan)(guan)(guan)(guan)、支架(jia)、法(fa)蘭、導管(guan)(guan)(guan)(guan)(guan)等(deng)(deng)附件組成(cheng)。 膨(peng)脹節是為(wei)了(le)補償因溫(wen)(wen)度差與機械振動(dong)引起(qi)的(de)附加應力(li)，而(er)設置在容(rong)器殼體或(huo)(huo)(huo)(huo)管(guan)(guan)(guan)(guan)(guan)道上(shang)(shang)的(de)一種(zhong)撓性(xing)結(jie)構(gou)。利用其(qi)工(gong)作(zuo)主體波紋(wen)管(guan)(guan)(guan)(guan)(guan)的(de)有效伸縮變(bian)形(xing)，以吸收管(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)由熱(re)脹冷(leng)縮等(deng)(deng)原因而(er)產生的(de)尺(chi)寸(cun)變(bian)化(hua)，或(huo)(huo)(huo)(huo)補償管(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)的(de)軸向(xiang)、橫向(xiang)和角(jiao)向(xiang)位移。也(ye)可用于降(jiang)噪減(jian)振。供(gong)熱(re)上(shang)(shang)，為(wei)了(le)防止供(gong)熱(re)管(guan)(guan)(guan)(guan)(guan)道升溫(wen)(wen)時，由于熱(re)伸長或(huo)(huo)(huo)(huo)溫(wen)(wen)度應力(li)而(er)引起(qi)管(guan)(guan)(guan)(guan)(guan)道變(bian)形(xing)或(huo)(huo)(huo)(huo)破壞，需(xu)要在管(guan)(guan)(guan)(guan)(guan)道上(shang)(shang)設置補償器，以補償管(guan)(guan)(guan)(guan)(guan)道的(de)熱(re)伸長，從而(er)減(jian)小管(guan)(guan)(guan)(guan)(guan)壁的(de)應力(li)和作(zuo)用在閥件或(huo)(huo)(huo)(huo)支架(jia)結(jie)構(gou)上(shang)(shang)的(de)作(zuo)用力(li)。