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一、经过情况:上海某冷冻厂五台 S8-12.5机器配置二台直径为1000毫米的中间冷却器。在生产旺季机器都投入运行期间,高压缸吸入温度一般还正常,中间压力约在3公斤/厘米~(?)(表压)左右,但当淡季只需开一台 S812.5双级机时,中压虽在3.5～4公斤/厘米~(?)(表压)而吸入温度却会高达40℃以上,按中压范围其相应的饱和温度应在1～4℃左右,怀疑是吸气阀片破碎或泄漏,但拆检进、排气阀片均正常,机器的其它结构部件也都正常。又怀疑中冷器浮球阀供液阀失效引起中冷器供液不足,于是停止浮球阀供液,改用手动膨胀阀供液,并将膨胀阀开大,结果出现压缩机倒霜现象,关小膨胀阀则高压缸吸气温度复又迅速上升。这种现象持续将近半年多也找不出原因。
First, after the situation: a frozen plant in Shanghai five S8-12.5 machine configuration two sets of 1000 mm diameter intercooler. In the production season are put into operation during the machine, high pressure cylinder suction temperature is generally normal, the middle pressure of about 3 kg / cm ~ (?) (Gauge pressure) or so, but when the off-season only need to open a S812.5 two-level machine , Although the medium pressure 3.5 ~ 4 kg / cm ~ (?) (Gauge pressure) and the inhalation temperature will be as high as 40 ℃, according to the pressure range of the corresponding saturation temperature should be about 1 ~ 4 ℃, suspected inhalation Valve broken or leaked, but the demolition inspection into the exhaust valve are normal, the other structural components of the machine are also normal. Also suspect intercooler float valve for the valve failure caused by insufficient supply of intercooler, then stop the float valve for liquid, switch to the manual expansion valve for the liquid, and the expansion valve open large, the results appear the phenomenon of compressor down cream, off Small expansion valve is the high-pressure cylinder suction temperature and then rapidly rising. This phenomenon lasted nearly six months can not find the reason.