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巴特分析造成計(jì)量泵汽蝕原因
來源： 發(fā)布時(shí)間：2016-12-21 13:28:02 瀏覽次數(shù)：次
通常，當(dāng)裝置中隔膜計(jì)量泵出現(xiàn)異常時(shí)，可能是裝置和管道參數(shù)變化使泵產(chǎn)生汽蝕。石油化工裝置現(xiàn)場(chǎng)所用的兩種規(guī)格計(jì)量泵均為進(jìn)口，由于介質(zhì)溫度高，經(jīng)多年使用經(jīng)常出現(xiàn)汽蝕。經(jīng)綜合分析，原因如下。
1、裝置汽蝕余量的變化在裝置現(xiàn)場(chǎng)，由于輸送的介質(zhì)含有固體顆粒使輸送管怪相對(duì)變小，或是介質(zhì)溫度升高而使裝置汽蝕余量減小；加上高溫介質(zhì)易汽化，致使泵腔內(nèi)的任力低于介質(zhì)汽化壓力，泵汽蝕性能大幅度下降，導(dǎo)致汽蝕。
2、液壓驅(qū)動(dòng)隔膜泵自吸能力液壓驅(qū)動(dòng)的隔膜計(jì)量泵液力端用隔膜把工藝流體和液壓流體隔開，介質(zhì)兩側(cè)流體壓力平衡時(shí)無泄露，但由于隔膜本身變形應(yīng)力太大（隔膜材料可少用PTFE合成橡膠以及不銹鋼等材料制成），消耗的流體動(dòng)能也就多。對(duì)應(yīng)于吸入條件差液體粘度大、溫度高的工況，隔膜計(jì)量泵管道進(jìn)口阻力變大，液壓腔吸入真空狀態(tài)的部分能量消耗于隔膜，因而隔膜計(jì)量泵自吸能力差，通常應(yīng)倒灌。
3、隔膜計(jì)量泵液力端放氣系統(tǒng)設(shè)計(jì)原有隔膜計(jì)量泵液力端的液壓介質(zhì)受高溫介質(zhì)的熱傳導(dǎo)易產(chǎn)生高溫汽化，加上活塞在高溫下往復(fù)運(yùn)動(dòng)時(shí)，產(chǎn)生的氣體過多，導(dǎo)致放氣閥放氣不暢準(zhǔn)隔膜處于非正常工作行程狀況，造成真空度下降，容易汽蝕。
4、進(jìn)口閥組水力設(shè)計(jì)考慮提高計(jì)量精度，一般計(jì)量泵的設(shè)計(jì)多采用狹小通道、雙密封閥、疊放式結(jié)構(gòu)。這種結(jié)構(gòu)并不適合輸送高粘度及有固體顆粒的介質(zhì)。停泵時(shí)，介質(zhì)冷卻后易結(jié)聚在流動(dòng)死區(qū)內(nèi)，造成泵密封不嚴(yán)，容易汽蝕。
5、隔膜計(jì)量泵密封系統(tǒng)及補(bǔ)償閥設(shè)計(jì)隔膜泵的密封和補(bǔ)償閥的設(shè)計(jì)是泵吸入過程產(chǎn)生高真空度的關(guān)鍵，應(yīng)與放氣系統(tǒng)的設(shè)計(jì)相匹配清持液體壓力的動(dòng)態(tài)平衡，解決補(bǔ)償閥的補(bǔ)油不暢問題。另外應(yīng)在結(jié)構(gòu)設(shè)計(jì)上協(xié)調(diào)保持較高的真空密封性和補(bǔ)償作用。當(dāng)然，隔膜的機(jī)械變形損耗，密封不嚴(yán)等也會(huì)降低真空度值。計(jì)量泵：www.www.bjxbb.com
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