由于柱塞泵采用的是飛濺式潤滑,當(dāng)機油液位低于規(guī)定的下限時,曲軸及連桿的帶油能力下降,造成軸瓦和軸頸間的供油不足,不能形成足夠的潤滑油膜,進而產(chǎn)生粘合磨損,如果不及時補加機油,就會出現(xiàn)軸瓦與軸頸干磨,發(fā)生燒瓦甚至抱軸事故。
通過認真分析故障發(fā)生的原因,采取相應(yīng)的預(yù)防措施,可以避免故障的發(fā)生。對于延長機泵設(shè)備的使用壽命,降低設(shè)備維修費用,確保注水任務(wù)的完成,具有十分重要的意義。下面我們對幾種常見故障的征兆進行描述,并對原因進行分析,對防止發(fā)生故障的措施進行探討,以期達到最大限度的發(fā)揮機泵設(shè)備的效能,提高經(jīng)濟效益的目的。
這類故障出現(xiàn)時一般表現(xiàn)為曲軸箱溫度升高,電機電流升高,機油顏色變黑等。在檢查過程中一旦發(fā)現(xiàn)這種情況應(yīng)及時停泵檢查,并采取相應(yīng)的措施。如果檢查處理不及時,就會發(fā)生燒瓦、抱軸事故,導(dǎo)致曲軸研傷,嚴重時甚至曲軸報廢。
?。ǘ┰蚍治?/div>
造成這類事故的原因很多,但主要原因是由于軸瓦和軸頸之間潤滑狀況惡化而產(chǎn)生的。
1、機油變質(zhì)、機油雜質(zhì)過多、進油孔堵塞、機油過少、機油牌號不對。
(1)當(dāng)曲軸箱由于某種原因進水,會使機油乳化呈現(xiàn)乳白色,粘度下降。使機油在軸瓦和軸頸間的附著能力下降,影響潤滑油膜的形成,這時容易在軸瓦和軸頸之間形成粘合磨損,導(dǎo)致軸瓦表面粗糙度增大,摩擦力增大,溫度升高,最后發(fā)生燒瓦事故。
?。?)機油中的雜質(zhì)主要是機油中的砂粒、灰塵以及泵內(nèi)金屬磨屑,這些雜質(zhì)進入軸瓦和軸頸間隙中,使軸瓦嵌油面積減小,并形成磨粒磨損,同時機油中的雜質(zhì)過多還容易堵塞軸瓦蓋上的機油流道,使軸瓦間隙內(nèi)供油不足產(chǎn)生粘合磨損。這兩種磨損共同作用的的結(jié)果使軸瓦溫度升高,間隙變小,最后導(dǎo)致燒瓦事故。
?。?)由于柱塞泵采用的是飛濺式潤滑,當(dāng)機油液位低于規(guī)定的下限時,曲軸及連桿的帶油能力下降,造成軸瓦和軸頸間的供油不足,不能形成足夠的潤滑油膜,進而產(chǎn)生粘合磨損,如果不及時補加機油,就會出現(xiàn)軸瓦與軸頸干磨,發(fā)生燒瓦甚至抱軸事故。
?。?)柱塞泵要求使用規(guī)定牌號的機油(CC15W/40),如果機油牌號不對,粘度過大流動困難,機油不能順利進入軸瓦和軸頸間隙內(nèi),就會造成供油不足。如果選用粘度低的機油,使機油在軸瓦間隙內(nèi)附著能力下降,油膜承載能力下降,這些因素都容易造成粘合磨損,繼而出現(xiàn)燒瓦事故。
2、變頻調(diào)速系統(tǒng)的影響
用變頻調(diào)速系統(tǒng)控制的注水泵,是根據(jù)系統(tǒng)壓力的設(shè)定自動調(diào)節(jié)泵的頻率和轉(zhuǎn)速,有時由于頻率低,電機轉(zhuǎn)速低。此時曲軸連桿帶油能力下降,機油不能連續(xù)進入軸瓦內(nèi),不能在軸瓦間隙中形成穩(wěn)定的油膜,因此,當(dāng)泵速過低時,易形成粘合磨損。
3、啟泵前未盤泵和空載運行、啟泵后馬上升壓甚至帶壓啟泵
長時間停運的泵曲軸箱內(nèi)機油溫度低,粘度大、流動性差,如果啟泵前未經(jīng)盤泵和空載運轉(zhuǎn),啟泵后馬上升壓或帶壓啟泵,此時沒有足夠的機油進入軸瓦間隙內(nèi),就會產(chǎn)生短時間的粘合磨損。如果長期使用這種方法操作,就會使軸瓦、軸頸摩擦面積增大,潤滑狀況進一步惡化,從而產(chǎn)生燒瓦事故。
4、液力端閥片損壞,連桿在返回的行程受高壓水推動,造成軸瓦和軸頸的沖擊、交變載荷次數(shù)增多,引起軸瓦溫度升高。
?。ㄈ╊A(yù)防措施
要避免這類事故發(fā)生,就必須做到以下幾點
1、必須做到定時巡回檢查,發(fā)現(xiàn)曲軸箱溫度升高超過上限時立即停機(超過環(huán)境溫度35CO)。在檢查箱體溫度時應(yīng)與正常運行時的溫度作比較,一旦發(fā)現(xiàn)溫升速度較快,立即采取措施停泵檢查。
2、在檢查中發(fā)現(xiàn)機油顏色變白,應(yīng)及時清洗曲軸箱更換機油(擦拭曲軸箱內(nèi)部只能用毛巾而不能用棉紗)。
3、當(dāng)機油液位下降低于下限時,及時補加機油,并更換漏油的油封。
4、發(fā)現(xiàn)機油顏色變混濁及時停泵檢查原因,清洗曲軸箱,檢查是否燒瓦。
5、使用規(guī)定牌號的機油,并對機油進行三過濾。
6、要求運行3000~5000小時進行一次二保,檢查軸瓦是否磨損,間隙是否合格。
7、新泵或大修泵要作好磨合工作,連續(xù)空載運行不少于24小時,各個壓力階段試運不少于8小時,并按5MPa間距逐步加壓。運行500小時后,清洗曲軸箱更換機油。
8、對于變頻泵轉(zhuǎn)速較低時對軸瓦潤滑產(chǎn)生的影響,可以設(shè)定逆變器的最低頻率(不低于25HZ),也可以調(diào)整泵的柱塞直徑。
9、嚴格按照操作規(guī)程操作,啟泵前盤泵檢查有無卡阻,空運5分鐘后再逐步加壓(冬季空運時間不低于10分鐘)。
10.用變頻控制的泵站,在啟泵、停泵時按照公頻啟、停泵方式操作。
11、及時更換損壞的閥片。
二、十字頭磨損、滑道拉傷
(一)故障現(xiàn)象
這類故障與燒瓦、曲軸研傷故障征兆基本相同,在燒瓦的同時往往也伴有十字頭磨損、滑道拉傷和連桿銷軸、銅套的磨損現(xiàn)象發(fā)生。此類故障往往是相互作用相互影響的。這類故障發(fā)生后,如果處理不及時,往往造成十字頭滑道和十字頭的嚴重損傷。
?。ǘ┰蚍治?/div>
導(dǎo)致這類事故的原因主要有以下幾個方面:
1、由于十字頭和滑道的潤滑狀況惡化而產(chǎn)生的,他的形成機理與燒瓦、曲軸研傷的形成機理相同。
2、由于軸瓦研傷后會產(chǎn)生大量的金屬磨屑,這些磨屑進入到十字頭和滑道間隙內(nèi)產(chǎn)生磨粒磨損,從而導(dǎo)致十字頭磨損和滑道拉傷。
3、由于銅套或銷軸松動,在十字頭內(nèi)產(chǎn)生軸向竄動,并與十字頭滑道直接接觸產(chǎn)生磨擦,從而導(dǎo)致拉缸事故。
4、因曲軸軸向竄動量過大,造成十字頭和滑道偏磨,導(dǎo)致拉缸事故。
5、由于連桿彎曲導(dǎo)致十字頭和滑道偏磨,造成拉缸事故.(這種故障一般在大修試運時出現(xiàn))
?。ㄈ╊A(yù)防措施
要避免這類事故的發(fā)生,除了采取防止燒瓦的措施以外,還應(yīng)注意以下幾點:
1、檢查曲軸的竄動量,如發(fā)現(xiàn)竄量過大,()及時修理。
2、定期清洗曲軸箱,檢查有無銅屑,并過濾機油。
3、銅套和銷軸松動后發(fā)生軸向竄動一般不容易檢查,這就要求在泵裝配時一定按規(guī)定的過盈量裝配,銅套的裝配采用冷裝配工藝。
4、控制大修質(zhì)量,不能安裝彎曲變形的連桿。
5、由于箱體溫度過高在短時間內(nèi)可造成大的事故(75oC),所以在泵上安裝溫度超限自動保護裝置,可以有效地避免事故的發(fā)生。
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