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锅炉膨胀节

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  膨胀(zhang)(zhang)节习(xi)惯上(shang)(shang)也叫(jiao)补偿(chang)器(qi),或(huo)伸(shen)缩节。由构成(cheng)其工作(zuo)主体的(de)波纹管(guan)(guan)(guan)(guan)(guan)(guan)(一(yi)种弹性(xing)元件(jian))和端管(guan)(guan)(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法兰、导(dao)管(guan)(guan)(guan)(guan)(guan)(guan)等(deng)附(fu)(fu)件(jian)组成(cheng)。 膨胀(zhang)(zhang)节是为(wei)了补偿(chang)因温度差与(yu)机械振(zhen)(zhen)动引起的(de)附(fu)(fu)加应力,而设置(zhi)(zhi)在(zai)容器(qi)壳体或(huo)管(guan)(guan)(guan)(guan)(guan)(guan)道上(shang)(shang)的(de)一(yi)种挠性(xing)结构。利用其工作(zuo)主体波纹管(guan)(guan)(guan)(guan)(guan)(guan)的(de)有效伸(shen)缩变(bian)(bian)形,以吸收(shou)管(guan)(guan)(guan)(guan)(guan)(guan)线(xian)、导(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容器(qi)等(deng)由热(re)胀(zhang)(zhang)冷缩等(deng)原因而产生的(de)尺寸变(bian)(bian)化,或(huo)补偿(chang)管(guan)(guan)(guan)(guan)(guan)(guan)线(xian)、导(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容器(qi)等(deng)的(de)轴向、横向和角向位移。也可用于(yu)降噪(zao)减振(zhen)(zhen)、供(gong)热(re)上(shang)(shang),为(wei)了防止供(gong)热(re)管(guan)(guan)(guan)(guan)(guan)(guan)道升温时,由于(yu)热(re)伸(shen)长或(huo)温度应力而引起管(guan)(guan)(guan)(guan)(guan)(guan)道变(bian)(bian)形或(huo)破坏,需要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道上(shang)(shang)设置(zhi)(zhi)补偿(chang)器(qi),以补偿(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道的(de)热(re)伸(shen)长,从而减小管(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)应力和作(zuo)用在(zai)阀件(jian)或(huo)支(zhi)架(jia)结构上(shang)(shang)的(de)作(zuo)用力。
  由(you)于(yu)膨胀节作为(wei)(wei)一种(zhong)能(neng)(neng)自(zi)由(you)伸缩的(de)(de)(de)弹性补偿元件,具有(you)工作可靠、性能(neng)(neng)良(liang)好、结构(gou)紧(jin)凑(cou)等(deng)优点,已广(guang)(guang)泛(fan)应用(yong)(yong)在(zai)(zai)化工、冶金、核能(neng)(neng)等(deng)部(bu)门。在(zai)(zai)容器上(shang)采(cai)用(yong)(yong)的(de)(de)(de)膨胀节,有(you)多种(zhong)形式(shi)(shi),就波纹的(de)(de)(de)形状而(er)言(yan),以(yi)U形膨胀节应用(yong)(yong)得最(zui)为(wei)(wei)广(guang)(guang)泛(fan),其次还有(you)Ω形和C形等(deng)。而(er)在(zai)(zai)管道(dao)上(shang)采(cai)用(yong)(yong)的(de)(de)(de)膨胀节就结构(gou)补偿而(er)言(yan),又分为(wei)(wei)万(wan)能(neng)(neng)式(shi)(shi)、压(ya)力(li)平衡式(shi)(shi)、铰(jiao)链式(shi)(shi)以(yi)及万(wan)向接头式(shi)(shi)等(deng)。