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我厂的一台D—6型低温箱存在降温缓慢的现象,据介绍,从35℃降到—40℃需5个小时以上,经几次维修,原因始终没有弄清,故障未能排除。笔者检修时,先检查未开机时的压力,F13系统的表压为7.5公斤/平方厘米,F22系统的表压为6.8公斤/平方厘米。开车试运行一段时间,F22级的吸汽管结霜正常,而F13级的排气压力表逐渐由14公斤/平方厘米下降到接近未开机时的压力值,吸气管不结霜,压缩机
I plant a D-6-type cold box there slow cooling phenomenon, according to reports, from 35 ℃ to -40 ℃ to be 5 hours or more, after several maintenance, the reason has not been clear, the failure can not be ruled out. When I overhaul, first check the pressure does not boot, F13 system gauge pressure of 7.5 kg / square centimeter, F22 system gauge pressure of 6.8 kg / square centimeter. Driving test run for a period of time, F22-level suction pipe frosting normal, and F13-level exhaust pressure gauge gradually from 14 kg / cm2 to close to the pressure value is not turned on, the suction pipe is not frost, the compressor