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膨脹(zhang)節習(xi)慣上(shang)也叫補(bu)償(chang)(chang)器,或(huo)伸(shen)縮(suo)節。由構成其(qi)工作(zuo)主體的波紋(wen)管(guan)(guan)(guan)(guan)(一(yi)種彈性(xing)元件(jian))和端管(guan)(guan)(guan)(guan)、支架、法蘭、導管(guan)(guan)(guan)(guan)等附件(jian)組(zu)成。 膨脹(zhang)節是為(wei)了補(bu)償(chang)(chang)因溫(wen)度差與(yu)機械振(zhen)動引起(qi)的附加應(ying)力(li)(li)(li),而(er)設(she)置在(zai)容器殼體或(huo)管(guan)(guan)(guan)(guan)道上(shang)的一(yi)種撓性(xing)結構。利用其(qi)工作(zuo)主體波紋(wen)管(guan)(guan)(guan)(guan)的有(you)效伸(shen)縮(suo)變形(xing),以吸(xi)收管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容器等由熱(re)(re)脹(zhang)冷(leng)縮(suo)等原因而(er)產生的尺寸變化,或(huo)補(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容器等的軸向、橫向和角(jiao)向位移。也可用于降(jiang)噪減振(zhen)。供熱(re)(re)上(shang),為(wei)了防止供熱(re)(re)管(guan)(guan)(guan)(guan)道升溫(wen)時(shi),由于熱(re)(re)伸(shen)長或(huo)溫(wen)度應(ying)力(li)(li)(li)而(er)引起(qi)管(guan)(guan)(guan)(guan)道變形(xing)或(huo)破壞,需要在(zai)管(guan)(guan)(guan)(guan)道上(shang)設(she)置補(bu)償(chang)(chang)器,以補(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)道的熱(re)(re)伸(shen)長,從而(er)減小管(guan)(guan)(guan)(guan)壁的應(ying)力(li)(li)(li)和作(zuo)用在(zai)閥件(jian)或(huo)支架結構上(shang)的作(zuo)用力(li)(li)(li)。