注射(she)冷(leng)水機主要用于成(cheng)型模(mo)具(ju)(ju)的塑料(liao)加工(gong)機械上。向(xiang)模(mo)具(ju)(ju)中的流(liu)道內注入冷(leng)凍水，通過熱交換冷(leng)卻模(mo)具(ju)(ju)，保持溫度恒定，滿足生(sheng)產過程的需要。在這個(ge)過程中，模(mo)具(ju)(ju)相當于一個(ge)熱交換器。

噴射式冷(leng)水機組反相故障(zhang)主要是(shi)電(dian)源(yuan)異(yi)常的常見故障(zhang)。主要有兩(liang)種原(yuan)因(yin):一是(shi)冷(leng)水機保護器(qi)損壞，二是(shi)冷(leng)水機電(dian)源(yuan)缺相或相序顛(dian)倒。

如何檢查(cha)電源(yuan)保護器是否損(sun)壞。

在供(gong)電(dian)(dian)(dian)(dian)正(zheng)常(chang)的(de)(de)情(qing)況下(xia)，關閉冷(leng)水機(ji)控制箱(xiang)的(de)(de)空氣開關。此時，冷(leng)水機(ji)組電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)保(bao)護(hu)器(qi)上(shang)的(de)(de)指(zhi)示(shi)燈亮起。一般情(qing)況下(xia)，紅(hong)(hong)色(se)表(biao)示(shi)供(gong)電(dian)(dian)(dian)(dian)，黃色(se)表(biao)示(shi)正(zheng)常(chang)供(gong)電(dian)(dian)(dian)(dian)。如(ru)(ru)果只有紅(hong)(hong)燈亮，說明(ming)(ming)低(di)溫冷(leng)水機(ji)電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)缺電(dian)(dian)(dian)(dian)或(huo)順序不對。如(ru)(ru)果確認供(gong)電(dian)(dian)(dian)(dian)正(zheng)常(chang)，但電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)保(bao)護(hu)器(qi)指(zhi)示(shi)燈不亮，則說明(ming)(ming)電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)保(bao)護(hu)器(qi)損壞。這(zhe)時，就需要根據這(zhe)些(xie)原因(yin)來判斷是失(shi)相還是相位反(fan)轉。可以找出功率較小的(de)(de)相消除更(geng)換錯誤的(de)(de)序，或(huo)者更(geng)換冷(leng)水機(ji)的(de)(de)電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)保(bao)護(hu)器(qi)。