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沙市脫硫泵用機械密封的相關知識普及

發布時間:2021-12-20 15:23:44 人氣:94680 來源:

  脫硫沙市泵用沙市機械密封靜(jing)環(huan)與(yu)(yu)殼體、動(dong)(dong)(dong)(dong)環(huan)與(yu)(yu)軸形成(cheng)的(de)間隙用(yong)成(cheng)型(xing)填料(liao)密(mi)(mi)封(feng)(feng)。在(zai)動(dong)(dong)(dong)(dong)環(huan)和靜(jing)環(huan)接(jie)觸的(de)端面(mian)形成(cheng)相對滑(hua)動(dong)(dong)(dong)(dong)面(mian),即動(dong)(dong)(dong)(dong)密(mi)(mi)封(feng)(feng)面(mian)。為保證密(mi)(mi)封(feng)(feng)良好(hao),動(dong)(dong)(dong)(dong)密(mi)(mi)封(feng)(feng)面(mian)應十分(fen)平直和光潔(jie)。彈(dan)簧力和被密(mi)(mi)封(feng)(feng)的(de)流體壓力使動(dong)(dong)(dong)(dong)環(huan)貼緊(jin)靜(jing)環(huan)。因動(dong)(dong)(dong)(dong)環(huan)與(yu)(yu)軸通(tong)過(guo)彈(dan)簧連接(jie),動(dong)(dong)(dong)(dong)環(huan)和靜(jing)環(huan)間貼合性(xing)受軸的(de)振動(dong)(dong)(dong)(dong)和擺(bai)動(dong)(dong)(dong)(dong)影響(xiang)較小(xiao)。靜(jing)環(huan)一般常用(yong)潤滑(hua)性(xing)好(hao)的(de)軟(ruan)質(zhi)(zhi)材料(liao)如石墨(mo)、填充聚四氟乙烯等,動(dong)(dong)(dong)(dong)環(huan)多(duo)用(yong)硬質(zhi)(zhi)合金、陶瓷等材料(liao)制造。


  在(zai)結構上(shang)(shang)采取相(xiang)應(ying)措施(shi)后,它可用于高(gao)(gao)溫、高(gao)(gao)壓(ya)、高(gao)(gao)真空(kong)、高(gao)(gao)速(su)和腐蝕性(xing)工作介質的場(chang)合。門(men)內部(bu)壓(ya)力(li)相(xiang)當時,閘(zha)板(ban)處于閉合狀態(tai),環(huan)(huan)成(cheng)初始(shi)密封,每次閥(fa)(fa)(fa)門(men)開關時,閥(fa)(fa)(fa)座圈能自(zi)動清(qing)潔閘(zha)板(ban)兩側,壓(ya)力(li)作用于閘(zha)板(ban),迫使它貼近(jin)出口閥(fa)(fa)(fa)座上(shang)(shang)的PTFE環(huan)(huan),壓(ya)縮它直到閘(zha)板(ban)停在(zai)鋼制閥(fa)(fa)(fa)座上(shang)(shang),這(zhe)樣(yang),就形(xing)成(cheng)了(le)雙(shuang)重密封,首先是(shi)PTFE對(dui)金(jin)(jin)(jin)屬密封,然后是(shi)金(jin)(jin)(jin)屬對(dui)金(jin)(jin)(jin)屬密封,閥(fa)(fa)(fa)座也(ye)被牢(lao)固(gu)地推(tui)到凹槽,在(zai)這(zhe)一點O形(xing)圈阻止任何后部(bu)介質流(liu)。

8.JPG

  形成(cheng)(cheng)進(jin)口密(mi)封(feng),管(guan)(guan)道(dao)(dao)壓(ya)力作用于(yu)進(jin)口閥座(zuo),使其移向閘(zha)板,這(zhe)時形成(cheng)(cheng)PTFE對金屬密(mi)封(feng),同時O形圈與(yu)閥座(zuo)凹(ao)(ao)槽形成(cheng)(cheng)緊(jin)密(mi)的密(mi)封(feng),當(dang)閥腔壓(ya)力大(da)于(yu)管(guan)(guan)道(dao)(dao)壓(ya)力時,由于(yu)熱膨脹,進(jin)口閥座(zuo)推向凹(ao)(ao)槽,閥腔內(nei)多(duo)余的壓(ya)力在閥座(zuo)與(yu)閘(zha)板之間泄放到(dao)管(guan)(guan)道(dao)(dao)上。


  脫硫沙市泵用沙市機械密封采用帶自密封能力的填料結構,無需經常調節,開、關極為輕便,且密封性可靠,填料函處設有輔助密封油脂注入結構,整體鑄造托架止動裝置,定位組裝的托架閥瓣,使得閥座更加穩定可靠,軸或軸套基本上不磨損,端面磨損后可自動補償,一般情況下不需經常性維修,脫硫沙市泵用沙市機械密封能用于高溫(wen)、低溫(wen)、高壓、真空、不同旋(xuan)轉(zhuan)頻率,以(yi)及(ji)各(ge)種腐蝕介(jie)(jie)質和含磨粒介(jie)(jie)質的密(mi)封,在長(chang)期運(yun)轉(zhuan)中密(mi)封狀態很穩定,泄(xie)露(lu)量很小,其泄(xie)露(lu)約為軟填料(liao)密(mi)封的1%。