最近很多客戶都會問高低溫試(shi)驗箱的冷媒使用完了,應該怎么加冷媒。加冷媒的時候需要注意哪些事項呢?下面(mian)由小編來告訴大(da)家:
在(zai)充注前(qian),先確定該(gai)體(ti)系應該(gai)灌(guan)入的冷劑數(shu)量。一般無劑量應按照(zhao)說明書中要求的數(shu)量灌(guan)注。若無具(ju)體(ti)規定,則可按系統各設備的具(ju)體(ti)情況(kuang),根據預算的數(shu)量來(lai)灌(guan)注。
高低(di)溫試驗箱制冷系統充注冷媒的(de)操作(zuo)方法如下:
1、準備一(yi)架磅秤,將冷媒鋼瓶過(guo)磅,記錄總重冷媒的凈重。
2、把鋼(gang)瓶(ping)支放(fang)在磅秤上,用帕(pa)x1紫銅管(guan)(guan)一段,用專制的螺紋(wen)一頭接至鋼(gang)瓶(ping)上,另一頭接到(dao)壓縮機吸(xi)入閥的多用孔道上,接多用孔道螺母(mu)暫不扳(ban)緊,先把鋼(gang)瓶(ping)打開一點,然后(hou)關閉,則把接管(guan)(guan)內(nei)的空氣排序,然后(hou)把螺母(mu)旋緊。
3、冷(leng)(leng)(leng)媒是以濕蒸(zheng)氣形式充入(ru)的(de),所(suo)以打開鋼瓶閥(fa)(fa)(fa)時(shi)要(yao)恰(qia)當,以防壓(ya)縮(suo)機發(fa)生液(ye)(ye)擊。同時(shi)打開壓(ya)縮(suo)機吸入(ru)閥(fa)(fa)(fa)的(de)多用(yong)孔道,開始充灌制(zhi)冷(leng)(leng)(leng)劑(ji)(ji)。若(ruo)系(xi)統(tong)(tong)內是呈真空(kong)(kong)狀況,則(ze)鋼瓶內的(de)制(zhi)冷(leng)(leng)(leng)劑(ji)(ji)就會自動(dong)注入(ru)系(xi)統(tong)(tong),待系(xi)統(tong)(tong)內壓(ya)力與鋼瓶內壓(ya)力平衡時(shi),制(zhi)冷(leng)(leng)(leng)刑就停止進(jin)入(ru)。這時(shi)若(ruo)系(xi)統(tong)(tong)內制(zhi)冷(leng)(leng)(leng)劑(ji)(ji)量還未加足,則(ze)可先關閉鋼瓶閥(fa)(fa)(fa),儲液(ye)(ye)器(qi)出口閥(fa)(fa)(fa),手動(dong)膨脹閥(fa)(fa)(fa)和壓(ya)縮(suo)機的(de)吸入(ru)閥(fa)(fa)(fa),啟(qi)(qi)動(dong)冷(leng)(leng)(leng)凝器(qi)的(de)冷(leng)(leng)(leng)卻水泵,然(ran)后(hou)啟(qi)(qi)動(dong)壓(ya)縮(suo)機。為了(le)防止液(ye)(ye)擊沖缸,應慢慢開啟(qi)(qi)吸入(ru)閥(fa)(fa)(fa),把系(xi)統(tong)(tong)內的(de)制(zhi)冷(leng)(leng)(leng)劑(ji)(ji)都抽入(ru)儲液(ye)(ye)器(qi),系(xi)統(tong)(tong)低壓(ya)部分又被抽成真空(kong)(kong),然(ran)后(hou)打開鋼瓶閥(fa)(fa)(fa),讓(rang)制(zhi)冷(leng)(leng)(leng)劑(ji)(ji)再次自動(dong)灌入(ru)系(xi)統(tong)(tong)。
4、如此反復(fu)進行,直至高低溫試(shi)驗箱加足系(xi)統(tong)(tong)(tong)(tong)所需的制(zhi)(zhi)冷(leng)劑(ji)(ji)量。也可(ke)以在(zai)系(xi)統(tong)(tong)(tong)(tong)再次袖成真(zhen)空后,打(da)開(kai)儲液器出口(kou)閥和小(xiao)開(kai)膨(peng)脹閥,讓系(xi)統(tong)(tong)(tong)(tong)正常運行,然后打(da)開(kai)鋼瓶(ping)閥,并逐漸關小(xiao)吸(xi)入閥(即開(kai)啟(qi)多用(yong)(yong)孔道),讓鋼瓶(ping)內的制(zhi)(zhi)冷(leng)劑(ji)(ji)依靠瓶(ping)內壓力與(yu)吸(xi)入壓力之差流(liu)入系(xi)統(tong)(tong)(tong)(tong)(應(ying)注意不能產生(sheng)液擊)。當充注到滿足要(yao)求時,要(yao)上關閉(bi)鋼瓶(ping)閥,然后讓接管中(zhong)殘留的制(zhi)(zhi)冷(leng)劑(ji)(ji)盡(jin)可(ke)能被吸(xi)入系(xi)統(tong)(tong)(tong)(tong),最后關閉(bi)多用(yong)(yong)孔道,停止壓縮機運行,充注制(zhi)(zhi)冷(leng)劑(ji)(ji)工作(zuo)基本結束。