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發布時間:2021-12-20 15:23:44 人氣:98753 來源:
脫硫達坂城泵用達坂城機械密封靜環與(yu)殼體、動(dong)(dong)(dong)(dong)(dong)環與(yu)軸形成的(de)間隙用(yong)成型填料(liao)密(mi)封(feng)。在(zai)動(dong)(dong)(dong)(dong)(dong)環和(he)(he)靜環接觸的(de)端(duan)面(mian)形成相對滑(hua)動(dong)(dong)(dong)(dong)(dong)面(mian),即動(dong)(dong)(dong)(dong)(dong)密(mi)封(feng)面(mian)。為保(bao)證密(mi)封(feng)良(liang)好,動(dong)(dong)(dong)(dong)(dong)密(mi)封(feng)面(mian)應十分平直和(he)(he)光潔。彈(dan)簧力(li)和(he)(he)被密(mi)封(feng)的(de)流(liu)體壓(ya)力(li)使動(dong)(dong)(dong)(dong)(dong)環貼(tie)緊靜環。因動(dong)(dong)(dong)(dong)(dong)環與(yu)軸通過彈(dan)簧連接,動(dong)(dong)(dong)(dong)(dong)環和(he)(he)靜環間貼(tie)合(he)性受軸的(de)振動(dong)(dong)(dong)(dong)(dong)和(he)(he)擺動(dong)(dong)(dong)(dong)(dong)影響較(jiao)小(xiao)。靜環一般常用(yong)潤滑(hua)性好的(de)軟質材料(liao)如石(shi)墨、填充聚四氟乙烯等,動(dong)(dong)(dong)(dong)(dong)環多(duo)用(yong)硬質合(he)金、陶瓷等材料(liao)制造。
在結構上(shang)采取相(xiang)應措施后(hou),它(ta)可用于(yu)高溫、高壓(ya)(ya)、高真空、高速和腐(fu)蝕性工作(zuo)介質的場(chang)合(he)。門內部壓(ya)(ya)力相(xiang)當時(shi),閘(zha)(zha)板(ban)處于(yu)閉合(he)狀態(tai),環成(cheng)初(chu)始密(mi)(mi)封,每次閥門開(kai)關時(shi),閥座(zuo)(zuo)圈能(neng)自動清潔閘(zha)(zha)板(ban)兩側,壓(ya)(ya)力作(zuo)用于(yu)閘(zha)(zha)板(ban),迫使它(ta)貼近出(chu)口閥座(zuo)(zuo)上(shang)的PTFE環,壓(ya)(ya)縮它(ta)直到(dao)閘(zha)(zha)板(ban)停在鋼制閥座(zuo)(zuo)上(shang),這樣,就形成(cheng)了雙(shuang)重密(mi)(mi)封,首(shou)先是PTFE對(dui)金屬(shu)密(mi)(mi)封,然(ran)后(hou)是金屬(shu)對(dui)金屬(shu)密(mi)(mi)封,閥座(zuo)(zuo)也(ye)被(bei)牢固地推到(dao)凹槽(cao),在這一點O形圈阻止任(ren)何后(hou)部介質流。
形(xing)成進口(kou)密(mi)封(feng),管道(dao)壓(ya)(ya)力作用于(yu)進口(kou)閥(fa)座(zuo),使(shi)其(qi)移(yi)向閘板,這時(shi)形(xing)成PTFE對金屬密(mi)封(feng),同時(shi)O形(xing)圈與(yu)閥(fa)座(zuo)凹槽形(xing)成緊密(mi)的密(mi)封(feng),當閥(fa)腔(qiang)壓(ya)(ya)力大于(yu)管道(dao)壓(ya)(ya)力時(shi),由于(yu)熱膨脹(zhang),進口(kou)閥(fa)座(zuo)推向凹槽,閥(fa)腔(qiang)內多(duo)余的壓(ya)(ya)力在閥(fa)座(zuo)與(yu)閘板之間泄放到管道(dao)上。
脫硫達坂城泵用達坂城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,脫硫達坂城泵用達坂城機械密封能用于(yu)高溫、低溫、高壓、真空(kong)、不同旋(xuan)轉頻率,以及各種腐(fu)蝕介質和(he)含磨粒介質的密(mi)封,在(zai)長期運轉中密(mi)封狀態很(hen)穩定,泄(xie)露量很(hen)小(xiao),其泄(xie)露約(yue)為軟(ruan)填料密(mi)封的1%。