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style="font-family:simsun; font-size:14px">多采用毛細管節(jié)流，如夏季制冷運行時，從靜態(tài)啟動到制冷系統(tǒng)平衡運行，其平衡壓力的變化要有一個過程，處于靜止狀態(tài)時，高、低壓側(cè)平衡壓力在1·1MPa_(表壓)左右；壓縮機啟動運行后，其低壓側(cè)表壓力逐漸降低，經(jīng)3～5rain降到”3MPa，然后慢慢上升，達到正常運行壓力時一般在0．46～0．54MPa。</span><br /><span style="font-family:simsun; font-size:14px"> 制冷系統(tǒng)從靜止狀態(tài)到平衡運行狀態(tài)，大約需要10"---1，5min，?這是制冷系統(tǒng)平衡狀態(tài)被打破建立新的平衡狀態(tài)所需要的時間。因此，在補加制冷劑觀察低壓側(cè)修理閥表壓力時，必須要掌握這個時間，要少量多次加入，每加一次量要有足夠的觀察時間，然后根據(jù)表壓力值決定是否補加或放出，不可急于求成。</span><br /><span style="font-family:simsun; font-size:14px"> <img alt="" src="http://img66.chem17.com/9/20170830/636396829186587289497.jpg" style="height:343px; width:669px" /> 在冬季補加制冷劑操作時，由于室外環(huán)境溫度低，</span><span style="font-family:simsun; font-size:14px">低壓側(cè)連接的修理閥表壓力明顯低于理論數(shù)據(jù)，不能單憑夏季充灌制冷劑時低壓側(cè)的壓力值來判斷制冷劑充灌量的多少，應(yīng)結(jié)合壓縮機運轉(zhuǎn)電流綜合判斷。上述按表壓力法觀察時，室內(nèi)風(fēng)扇也要同步運轉(zhuǎn)，否則蒸發(fā)器周圍的冷氣無法及時擴散，會使蒸發(fā)器溫度下降，蒸發(fā)壓力也隨之下降，讀出的壓力值就偏小，也會影響到工作電流偏小，從而造成誤判，這也是應(yīng)注意的重點。</span><br /><span style="font-family:simsun; font-size:14px"> 通過連接在制冷系統(tǒng)中低壓側(cè)修理閥上壓力表所測出的壓力值j判斷制冷劑補加量是否合適的方法較為簡便，在防爆空調(diào)器</span>安裝與維修<span style="font-family:simsun; font-size:14px">時經(jīng)常使用，但是缺點是比較粗，準確度不高。為更準確地判斷制冷劑補加量是否合適還可采用以下方法：</span><br /><span style="font-family:simsun; font-size:14px"> 以運轉(zhuǎn)電流和啟動性能判斷充灌制冷劑：適當時運轉(zhuǎn)電流應(yīng)接近銘牌中l(wèi)的額定電流值，或低于額定值l／4r停機尋min開機司。以運轉(zhuǎn)；充灌制冷劑不足時，運轉(zhuǎn)電流偏低，停機不到1min開機即可以運轉(zhuǎn)；充灌制冷劑過量時，運轉(zhuǎn)電流超過額定值∥停機3min再開也不能啟動，應(yīng)放出多余的制冷劑才能恢復(fù)。</span><br /><span style="font-family:simsun; font-size:14px"> 在</span><strong><span style="font-size:14px"><span style="font-family:宋體">變電站防爆空調(diào)</span></span></strong><span style="font-family:simsun; font-size:14px">的安裝與維修中，有時在充灌制冷劑的過程中，出現(xiàn)壓縮機的運行電流已接近甚至達到額定電流值，而低壓壓力仍未達到標準規(guī)定值的現(xiàn)象。此時，從各現(xiàn)象上分析，如壓縮機吸氣管無結(jié)露現(xiàn)象，蒸發(fā)器結(jié)露不全面等，明顯表明制冷劑不足，但為了壓縮機的安全運行，只能犧牲空調(diào)器的制冷量，來維持防爆空調(diào)器的使用。否則，如果再多充灌制冷劑，壓縮機則運行電流過大，溫升過高，遇使用環(huán)境溫度升高和熱負荷加大時，則有毀壓縮機的危險。*的解決辦法只能是更換壓縮機。</span></p> </div> <div id="1kum3eb3mmr" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-1386094.html">制藥廠用防爆空調(diào)是一種全新概念的儀器</a></li> <li>下一篇：<a href="/Article-1276893.html">防爆空調(diào)的溫控開關(guān)</a></li> </ul> </div> </div>   <div id="1kum3eb3mmr" class="foot_box"> <div id="1kum3eb3mmr" class="foot_t"> <div id="1kum3eb3mmr" class="w1200"> <a href="/">網(wǎng)站首頁</a>　|　<a href="/aboutus.html">關(guān)于我們</a>　|　<a href="/products.html">產(chǎn)品中心</a>　|　<a href="/news.html">新聞動態(tài)</a>　|　<a href="/article.html">技術(shù)文章</a>　|　<a href="/honor.html">榮譽資質(zhì)</a>　|　<a href="/order.html" target="_blank">在線留言</a>　|　<a href="/contact.html">聯(lián)系我們</a> <span><a href="javascript:;" 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