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膨脹節(jie)習慣上(shang)也叫(jiao)補(bu)償(chang)器(qi),或(huo)伸(shen)縮(suo)節(jie)。由構(gou)成(cheng)其工(gong)作(zuo)主體(ti)的(de)波紋管(guan)(guan)(guan)(guan)(guan)(guan)(一種彈性(xing)元件(jian))和(he)端管(guan)(guan)(guan)(guan)(guan)(guan)、支架(jia)、法蘭、導管(guan)(guan)(guan)(guan)(guan)(guan)等(deng)(deng)附件(jian)組成(cheng)。 膨脹節(jie)是為(wei)了補(bu)償(chang)因溫(wen)度(du)差與機械振(zhen)動引起的(de)附加應(ying)(ying)力(li),而(er)(er)設置(zhi)在(zai)容(rong)器(qi)殼體(ti)或(huo)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)上(shang)的(de)一種撓性(xing)結(jie)構(gou)。利用(yong)其工(gong)作(zuo)主體(ti)波紋管(guan)(guan)(guan)(guan)(guan)(guan)的(de)有效伸(shen)縮(suo)變(bian)形,以吸(xi)收管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)(deng)由熱脹冷縮(suo)等(deng)(deng)原(yuan)因而(er)(er)產(chan)生的(de)尺寸變(bian)化,或(huo)補(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)(deng)的(de)軸向(xiang)、橫向(xiang)和(he)角向(xiang)位移(yi)。也可(ke)用(yong)于降噪減振(zhen)。供熱上(shang),為(wei)了防止供熱管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)升溫(wen)時,由于熱伸(shen)長(chang)(chang)或(huo)溫(wen)度(du)應(ying)(ying)力(li)而(er)(er)引起管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)變(bian)形或(huo)破壞(huai),需要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)上(shang)設置(zhi)補(bu)償(chang)器(qi),以補(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)的(de)熱伸(shen)長(chang)(chang),從而(er)(er)減小管(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)應(ying)(ying)力(li)和(he)作(zuo)用(yong)在(zai)閥件(jian)或(huo)支架(jia)結(jie)構(gou)上(shang)的(de)作(zuo)用(yong)力(li)。