壓縮空氣在蒸發(fā)器中冷卻時(shí)，有大量凝結(jié)水析出。如果冷媒蒸發(fā)溫度過(guò)低，使蒸發(fā)器銅管表面溫度在負(fù)荷條件下低于水的冰點(diǎn)，則凝結(jié)水就會(huì)在蒸發(fā)器里結(jié)冰，嚴(yán)重時(shí)阻塞氣流通道，使供氣管道癱瘓。為了防止這種情況出現(xiàn)，必須對(duì)冷媒蒸發(fā)溫度加以控制。其簡(jiǎn)單有效的措施就是在冷凝器和蒸發(fā)器之間加設(shè)一只熱氣旁路閥。熱氣旁路閥的測(cè)壓管與蒸發(fā)壓力直接連接，當(dāng)蒸發(fā)壓力低到一定程序時(shí)，熱氣旁路閥開啟，冷凝器中的高溫冷媒蒸氣直接進(jìn)入蒸發(fā)器，提升蒸發(fā)溫度，避免冰堵現(xiàn)象。
 

       Compressed air cooling in the evaporator, there are a lot of water precipitation. If the refrigerant evaporation temperature is too low, the evaporator brass surface temperature under load conditions below the freezing point of water, the water will freeze in the evaporator, serious when blocking flow channel, make the gas supply pipe. In order to prevent the problem, refrigerant evaporation temperature must be under control. Its simple and effective measure is to set up between the condenser and evaporator a hot gas bypass valve. Hot gas bypass valve works directly with evaporating pressure connection, when the evaporating pressure low to a certain application, hot gas bypass valve open, high temperature of the refrigerant vapor condenser directly into the evaporator, promote evaporation temperature, avoid ice blocking phenomenon.
 

      由于蒸發(fā)溫度降低往往是由冷干機(jī)負(fù)荷過(guò)低造成的，而冷凝器中的高壓蒸氣總是在壓縮機(jī)全負(fù)荷狀態(tài)時(shí)壓出的，所以使用熱氣旁路閥雖然能在一定范圍內(nèi)防止蒸發(fā)溫度過(guò)低帶來(lái)的麻煩，但不是節(jié)能之舉。在大型冷干機(jī)中往往采用壓縮機(jī)卸荷或變頻調(diào)速等辦法來(lái)限制蒸發(fā)溫度過(guò)低。
 

        Due to the evaporation temperature decrease is often caused by a low person load, and the high pressure steam in the condenser is always in full load condition of compressor, so the use of hot gas bypass valve can prevent evaporation temperature within a certain scope the trouble too low but not energy-saving. Often used in large person compressor unloading or frequency control of motor speed and so on ways to limit evaporation temperature is too low.