冷库运行中,偶尔会碰到低压比正常值低,即使开打或光效膨胀阀也没什么效果。手摸冷库机组过滤器,有点冷,潮湿有水珠,结露或结霜。这种现象,我们称之为过滤器堵塞。
过滤器堵塞,一般是系统不干净,铜屑焊渣等杂物堆积在过滤器里面,时间长了,越堆约多,那么液体制冷剂经过过滤器时,产生较大压力降,由于经过了膨胀阀一样,那么液体制冷剂经过节流之后,制冷剂会发生蒸发,吸收过滤器的热量,过滤器外表面就会比环境温度低,慢慢结露结霜。
正常的过滤器,温度是稍微比黄金温度高的,可以说是冷凝温度。一对比,摸摸过滤器,就知道是否堵了。发现过滤结露结霜,那么就要更换过滤器了。不能再继续使用。
如果更换了过滤器,低压压力还是上不去,就要检查其他方面了,是否还存在其他原因。
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