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發布時(shi)間:2021-05-18 16:38:54 人氣(qi):252314 來源:
平原泵用平原機械密封技術在現代流體工程技術中所占的分量雖然不是太大,但也不容忽視。那么,在平原泵用平原機械密封檢查時(shi)需要注意什么呢?
1、彈(dan)(dan)簧(huang)壓縮(suo)量越大密封(feng)效果越好。其實(shi)不(bu)然,彈(dan)(dan)簧(huang)壓縮(suo)量過(guo)大,可導致摩(mo)擦副(fu)急劇磨損,瞬間燒損;過(guo)度的壓縮(suo)使彈(dan)(dan)簧(huang)失去調(diao)節動環(huan)端面的能力,導致密封(feng)失效。
2、動(dong)環(huan)密(mi)封(feng)(feng)圖越(yue)緊(jin)越(yue)好。其(qi)實動(dong)環(huan)密(mi)封(feng)(feng)圈過緊(jin)有(you)害無益。一是(shi)加劇密(mi)封(feng)(feng)圈與軸套間(jian)的磨損(sun)(sun),過早泄漏;二是(shi)增大了動(dong)環(huan)軸向調(diao)(diao)整、移動(dong)的阻力,在(zai)工況變化頻繁時無法(fa)適時進行調(diao)(diao)整;三是(shi)彈簧過度疲勞(lao)易損(sun)(sun)壞;四是(shi)使動(dong)環(huan)密(mi)封(feng)(feng)圈變形,影響密(mi)封(feng)(feng)效果。
3、靜(jing)(jing)環(huan)(huan)密封圈越(yue)緊(jin)越(yue)好。靜(jing)(jing)環(huan)(huan)密封圈基本處于靜(jing)(jing)止狀態,相對較(jiao)緊(jin)密封效果會好些(xie),但過緊(jin)也(ye)是(shi)有(you)害的(de)。一是(shi)引起靜(jing)(jing)環(huan)(huan)密封因過度變(bian)形,影響密封效果;二是(shi)靜(jing)(jing)環(huan)(huan)材質以石墨居多,一般(ban)較(jiao)脆,過度受力極(ji)易(yi)引起碎裂;三是(shi)安裝、拆卸困難(nan),極(ji)易(yi)損壞靜(jing)(jing)環(huan)(huan)。
4、葉輪鎖母越緊越好。平原泵用平原機械密封泄(xie)漏(lou)(lou)(lou)中,軸(zhou)(zhou)(zhou)(zhou)套與(yu)軸(zhou)(zhou)(zhou)(zhou)之間(jian)(jian)(jian)(jian)(jian)(jian)(jian)的(de)泄(xie)漏(lou)(lou)(lou)(軸(zhou)(zhou)(zhou)(zhou)間(jian)(jian)(jian)(jian)(jian)(jian)(jian)泄(xie)漏(lou)(lou)(lou))是比較(jiao)(jiao)(jiao)常(chang)見的(de)。一(yi)般(ban)認為,軸(zhou)(zhou)(zhou)(zhou)間(jian)(jian)(jian)(jian)(jian)(jian)(jian)泄(xie)漏(lou)(lou)(lou)就(jiu)是葉輪(lun)鎖(suo)(suo)母沒鎖(suo)(suo)緊(jin)(jin),其(qi)實導致軸(zhou)(zhou)(zhou)(zhou)間(jian)(jian)(jian)(jian)(jian)(jian)(jian)泄(xie)漏(lou)(lou)(lou)的(de)因素較(jiao)(jiao)(jiao)多,如軸(zhou)(zhou)(zhou)(zhou)間(jian)(jian)(jian)(jian)(jian)(jian)(jian)墊失效(xiao),偏移(yi),軸(zhou)(zhou)(zhou)(zhou)間(jian)(jian)(jian)(jian)(jian)(jian)(jian)內有雜質,軸(zhou)(zhou)(zhou)(zhou)與(yu)軸(zhou)(zhou)(zhou)(zhou)套配合處(chu)有較(jiao)(jiao)(jiao)大(da)的(de)形位誤差,接觸面(mian)破壞,軸(zhou)(zhou)(zhou)(zhou)上各(ge)部(bu)件間(jian)(jian)(jian)(jian)(jian)(jian)(jian)有間(jian)(jian)(jian)(jian)(jian)(jian)(jian)隙(xi),軸(zhou)(zhou)(zhou)(zhou)頭螺紋過長等都會(hui)導致軸(zhou)(zhou)(zhou)(zhou)間(jian)(jian)(jian)(jian)(jian)(jian)(jian)泄(xie)漏(lou)(lou)(lou)。鎖(suo)(suo)母鎖(suo)(suo)緊(jin)(jin)過度(du)只會(hui)導致軸(zhou)(zhou)(zhou)(zhou)間(jian)(jian)(jian)(jian)(jian)(jian)(jian)墊過早(zao)失效(xiao),相反適度(du)鎖(suo)(suo)緊(jin)(jin)鎖(suo)(suo)母,使(shi)(shi)軸(zhou)(zhou)(zhou)(zhou)間(jian)(jian)(jian)(jian)(jian)(jian)(jian)墊始終保持一(yi)定的(de)壓縮彈性,在運轉中鎖(suo)(suo)母會(hui)自動適時鎖(suo)(suo)緊(jin)(jin),使(shi)(shi)軸(zhou)(zhou)(zhou)(zhou)間(jian)(jian)(jian)(jian)(jian)(jian)(jian)始終處(chu)于良好(hao)的(de)密封狀態。
5、新的比舊的好。相對而言,使用新平原泵用平原機械密封的效果好于舊的,但新平原泵用平原機械密封的質(zhi)量(liang)或材(cai)質(zhi)選擇不(bu)當時,配(pei)合尺寸誤差較(jiao)大會影響密封效果;在聚(ju)合性和滲透(tou)性介質(zhi)中,靜(jing)環如無過度磨(mo)損,還是不(bu)更換為(wei)好。因為(wei)靜(jing)環在靜(jing)環座(zuo)中長時間處(chu)于靜(jing)止狀態,使聚(ju)合物和雜質(zhi)沉(chen)積為(wei)一體,起(qi)到了(le)較(jiao)好的密封作用(yong)。
6、拆修總比不拆好。一旦出現平原泵用平原機械密封泄漏(lou)便急于(yu)拆(chai)修(xiu)(xiu),其實,有(you)時(shi)密封并沒(mei)有(you)損壞,只(zhi)需調整工況或適當調整密封就可消除(chu)泄漏(lou)。這樣既(ji)避免浪(lang)費又可以驗證自(zi)己的故障判斷能(neng)力,積累維修(xiu)(xiu)經驗提高(gao)檢修(xiu)(xiu)質量。