波紋管膨脹節是用金屬波紋管制成的一種膨脹節。它能沿管道軸線方向伸縮,也允許(xu)少量彎(wan)曲。圖2為常見的軸向式(shi)波紋(wen)(wen)管(guan)(guan)膨脹節(jie),用(yong)(yong)在(zai)(zai)管(guan)(guan)道上(shang)進行軸向長度(du)補償。為了防(fang)止超(chao)過允許(xu)的補償量,在(zai)(zai)波紋(wen)(wen)管(guan)(guan)兩(liang)端設置(zhi)有保護拉桿或保護環,在(zai)(zai)與(yu)它(ta)連(lian)接的兩(liang)端管(guan)(guan)道上(shang)設置(zhi)導向支架。另(ling)外還有轉角式(shi)和(he)橫(heng)向式(shi)膨脹節(jie),可用(yong)(yong)來(lai)補償管(guan)(guan)道的轉角變形(xing)和(he)橫(heng)向變形(xing)。這類膨脹節(jie)的優點是(shi)節(jie)省空間,節(jie)約(yue)材料,便于(yu)(yu)標準化和(he)批(pi)量生(sheng)產,缺點是(shi)壽命較短。波紋(wen)(wen)管(guan)(guan)膨脹節(jie)一般用(yong)(yong)于(yu)(yu)溫度(du)和(he)壓力(li)(li)不(bu)很高、長度(du)較短的管(guan)(guan)道上(shang)。隨(sui)著波紋(wen)(wen)管(guan)(guan)生(sheng)產技術水平的提(ti)高,這類膨脹節(jie)的應用(yong)(yong)范圍正(zheng)在(zai)(zai)擴大。目前,波紋(wen)(wen)管(guan)(guan)膨脹節(jie)可用(yong)(yong)在(zai)(zai)最高壓力(li)(li)6.0兆帕的管(guan)(guan)系中。