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水泵機械密封應用中常見問題分析

2021-08-02 08:20:26 蕪湖(hu)中天

 水(shui)泵機械密(mi)封屬于水(shui)泵部件(jian)中(zhong)(zhong)比較關鍵的易損件(jian),水(shui)泵機械密(mi)封漏(lou)水(shui)的故(gu)(gu)障是(shi)水(shui)泵故(gu)(gu)障中(zhong)(zhong)最容(rong)易出(chu)現的故(gu)(gu)障之一,水(shui)泵機械密(mi)封使(shi)用(yong)中(zhong)(zhong)常見(jian)的幾個問題做個簡單分析(xi)。

1、水泵機(ji)械密封彈(dan)簧(huang)(huang)壓縮量(liang)越大密封效(xiao)果是否越好?其(qi)實不然,彈(dan)簧(huang)(huang)壓縮量(liang)過(guo)大,可導(dao)致(zhi)摩擦副急劇(ju)磨(mo)損,瞬間燒損,過(guo)度的壓縮使彈(dan)簧(huang)(huang)失去調節動(dong)環端面(mian)的能力,導(dao)致(zhi)密封失效(xiao)。

2、動(dong)環(huan)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)圈越(yue)(yue)緊越(yue)(yue)好嗎(ma)? 動(dong)環(huan)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)圈過(guo)緊有(you)害無益。一是(shi)加劇(ju)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)圈與軸套間的(de)磨損,過(guo)早泄露;二(er)是(shi)增大了動(dong)環(huan)軸向調(diao)(diao)整、移動(dong)的(de)阻力,在工況變(bian)(bian)化頻(pin)繁時無法適時進行調(diao)(diao)整;三是(shi)彈簧過(guo)度(du)疲(pi)勞易損壞;四是(shi)使動(dong)環(huan)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)圈變(bian)(bian)形,影響(xiang)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)效果。

機械密封件

3、靜(jing)(jing)(jing)環密(mi)(mi)封(feng)圈(quan)越(yue)緊越(yue)好?靜(jing)(jing)(jing)環密(mi)(mi)封(feng)圈(quan)基本處于靜(jing)(jing)(jing)止狀態(tai),相對較(jiao)緊密(mi)(mi)封(feng)效果會好些,但過緊也(ye)是有(you)害的。一(yi)是引起靜(jing)(jing)(jing)環密(mi)(mi)封(feng)因過度(du)變形,影響(xiang)密(mi)(mi)封(feng)效果;二是靜(jing)(jing)(jing)環材質以石墨居(ju)多,一(yi)般較(jiao)脆,過度(du)受力極(ji)易引起碎(sui)裂;三是安裝、拆卸(xie)困難(nan),極(ji)易損壞靜(jing)(jing)(jing)環。

4、葉(xie)輪螺(luo)母(mu)越(yue)近(jin)越(yue)好嗎?機(ji)械密(mi)封泄(xie)露中(zhong),軸(zhou)套與(yu)軸(zhou)之間(jian)(jian)(jian)的(de)泄(xie)露是(shi)比較(jiao)常見的(de)。一般認(ren)為,軸(zhou)間(jian)(jian)(jian)泄(xie)露就(jiu)是(shi)葉(xie)輪鎖(suo)(suo)(suo)(suo)母(mu)沒鎖(suo)(suo)(suo)(suo)緊(jin),其(qi)實導(dao)致(zhi)軸(zhou)間(jian)(jian)(jian)泄(xie)露的(de)因素(su)較(jiao)多,如軸(zhou)間(jian)(jian)(jian)墊(dian)失(shi)效,偏(pian)移(yi),軸(zhou)間(jian)(jian)(jian)內有雜質,軸(zhou)與(yu)軸(zhou)套配合處(chu)有較(jiao)大的(de)形位誤差,接觸面破壞(huai),軸(zhou)上各部(bu)件間(jian)(jian)(jian)有間(jian)(jian)(jian)隙,軸(zhou)頭螺(luo)紋過長(chang)等(deng)都會(hui)(hui)導(dao)致(zhi)軸(zhou)間(jian)(jian)(jian)泄(xie)露。鎖(suo)(suo)(suo)(suo)母(mu)鎖(suo)(suo)(suo)(suo)緊(jin)過度(du)只會(hui)(hui)導(dao)致(zhi)軸(zhou)間(jian)(jian)(jian)墊(dian)過早失(shi)效,相反適度(du)鎖(suo)(suo)(suo)(suo)緊(jin)鎖(suo)(suo)(suo)(suo)母(mu),使軸(zhou)間(jian)(jian)(jian)墊(dian)始(shi)終保(bao)持一定的(de)壓縮彈性,在運(yun)轉(zhuan)中(zhong)鎖(suo)(suo)(suo)(suo)母(mu)會(hui)(hui)自動適時(shi)鎖(suo)(suo)(suo)(suo)緊(jin),使軸(zhou)間(jian)(jian)(jian)始(shi)終處(chu)于良好的(de)密(mi)封狀(zhuang)態。