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锅炉膨胀节

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  膨胀(zhang)节(jie)习(xi)惯上(shang)(shang)也叫补偿(chang)器(qi),或伸(shen)缩节(jie)。由(you)构(gou)成其(qi)工(gong)作(zuo)主(zhu)体(ti)的(de)波纹管(guan)(guan)(guan)(guan)(一种弹性(xing)元(yuan)件)和(he)(he)端管(guan)(guan)(guan)(guan)、支(zhi)架、法兰、导(dao)管(guan)(guan)(guan)(guan)等(deng)附件组成。 膨胀(zhang)节(jie)是为(wei)了补偿(chang)因温(wen)度差与机(ji)械振(zhen)动(dong)引(yin)起的(de)附加应力,而(er)(er)设(she)置在容(rong)器(qi)壳体(ti)或管(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)的(de)一种挠性(xing)结构(gou)。利用其(qi)工(gong)作(zuo)主(zhu)体(ti)波纹管(guan)(guan)(guan)(guan)的(de)有效伸(shen)缩变(bian)(bian)形(xing),以吸(xi)收管(guan)(guan)(guan)(guan)线、导(dao)管(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)由(you)热胀(zhang)冷缩等(deng)原因而(er)(er)产生(sheng)的(de)尺寸变(bian)(bian)化,或补偿(chang)管(guan)(guan)(guan)(guan)线、导(dao)管(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)的(de)轴向(xiang)、横向(xiang)和(he)(he)角向(xiang)位移。也可用于(yu)降噪(zao)减(jian)振(zhen)、供热上(shang)(shang),为(wei)了防止供热管(guan)(guan)(guan)(guan)道(dao)升温(wen)时,由(you)于(yu)热伸(shen)长或温(wen)度应力而(er)(er)引(yin)起管(guan)(guan)(guan)(guan)道(dao)变(bian)(bian)形(xing)或破(po)坏,需要在管(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)设(she)置补偿(chang)器(qi),以补偿(chang)管(guan)(guan)(guan)(guan)道(dao)的(de)热伸(shen)长,从而(er)(er)减(jian)小(xiao)管(guan)(guan)(guan)(guan)壁的(de)应力和(he)(he)作(zuo)用在阀件或支(zhi)架结构(gou)上(shang)(shang)的(de)作(zuo)用力。
  由于膨(peng)胀节(jie)作为一(yi)种能自(zi)由伸缩的(de)弹性补(bu)偿元件,具有工(gong)作可靠(kao)、性能良好、结构紧凑等优点,已广(guang)泛(fan)应用(yong)(yong)在化工(gong)、冶(ye)金、核能等部门。在容(rong)器上采用(yong)(yong)的(de)膨(peng)胀节(jie),有多(duo)种形(xing)(xing)式(shi),就(jiu)波纹的(de)形(xing)(xing)状而(er)(er)言(yan)(yan),以U形(xing)(xing)膨(peng)胀节(jie)应用(yong)(yong)得(de)为广(guang)泛(fan),其次还有Ω形(xing)(xing)和C形(xing)(xing)等。而(er)(er)在管道上采用(yong)(yong)的(de)膨(peng)胀节(jie)就(jiu)结构补(bu)偿而(er)(er)言(yan)(yan),又分为万(wan)能式(shi)、压力(li)平衡式(shi)、铰链式(shi)以及万(wan)向(xiang)接头(tou)式(shi)等。