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冷水机组热力膨胀阀常见问题及解决方法

2016-06-13 16:10:51   来源:http://sxt.qblzl.com/       
导读:冷水机热力膨胀阀故障维修—热力膨胀阀的常见故障:1 热力膨胀阀常见的堵塞故障,2 冷水机组热力膨胀阀的感温包故障,3 冷水机组热力膨胀阀调整不当造成故障。解决办法:1 对于脏堵,如果不是很严重,给冷水机,以下是详细解决方法
          热力膨胀阀是冷水机组中一个非常重要的部件,随着冷水机组使用年限过长,或操作不当,都会引起故障发生,下面小编就来给大家分析一下热力膨胀阀有哪些故障和对应的解决方法,供大家参考。

冷水机热力膨胀阀故障维修—热力膨胀阀的作用和工作原理

        热力膨胀阀有外平衡跟内平衡式两种,其主要作用是固定在蒸发器出口管道上的感温包感应蒸发器出口的过热温度,使感温包内产生压力,并由毛细管传到膜片上部的空间,在压力的作用下膜片以弹性变形的方式把信号传递给顶针(执行机构),从而调节阀门的开度,控制制冷剂的流量。

冷水机热力膨胀阀故障维修—热力膨胀阀的常见故障:

1、热力膨胀阀常见的堵塞故障。

        制冷系统中热力膨胀阀的堵塞故障是经常发生的,包括“脏堵”和“冰堵”。脏堵的主要原因是制冷系统中存在杂质,例如焊渣,铜屑,铁屑,纤维等。冰堵的原因是系统中含有过多的水分。一般情况下,脏堵塞发生在干燥过滤器上,系统中的杂质被过滤器拦截住,造成脏堵现象。发生时,系统首先表现为回气温度升高,过热度升高,故障严重后,使系统停止运转,如没有把系统中的杂质清除掉,系统不能再开机。冰堵塞一般发生在膨胀阀的节流孔处,因为这里是整个系统中温度低,孔径小的地方。由于制冷系统不在制冷,系统整体温度回升,随着温度的提高,冰堵处会逐渐融化,而后系统又恢复制冷能力,随着系统整体温度的再次降低又会出现冰堵现象,故冰堵塞是一个反复程。


2、冷水机组热力膨胀阀的感温包故障。 

        当系统中出现膨胀阀供液时多时少或膨胀阀关不小,过热度,过冷度不正确等现象时,原因可能就是感温包出了故障。


3、冷水机组热力膨胀阀调整不当造成故障。

        在调整热力膨胀阀之前,必须确认空调制冷异常是由于热力膨胀阀偏离佳工作点引起的,而不是因为氟利昂少、干燥过滤器堵塞、滤网、风机、皮带等其他原因所引起的。同时,必须保证感温包采样信号的正确性,感温安装位置必须正确,不可安装在管道的正下方,以防管子底部积油等因素影响感温包正确感温。

冷水机组组热力膨胀阀故障维修—热力膨胀阀常见故障解决方法:

1、对于脏堵,如果不是很严重,给冷水机换一个干燥过滤器就可以了。

        如果非常严重,就要重新清理制冷系统管路中的杂质,抽真空,重新充注制冷剂。对于轻微冰堵,可用热毛巾敷在冰堵处,如果冰堵程度比较严重,已影响了系统的正常运行,则要换掉过滤干燥器,重新处掉系统管路中的水分,抽真空,重新充注制冷剂。


2、一般情况下,感温包尽量装在蒸发器出口水平段的回气管上,应远离压缩机吸气口,而且不宜垂直安装。

        当水平回气管直径小于22mm时,感温包宜安装在回气管的顶上端,即吸气管的“一点钟”。当水平回气管直径大于22mm时,感温包要安装在回气管轴线以下与水平轴线成45 度左右,即吸气管的“3 点钟”位置。因为把感温包安装在吸气管的上部会降低反应的灵敏度,可能使蒸发器的制冷剂过多,把感温包安装在吸气管的底部会引起供液的紊乱,因为总有少量的液态制冷剂流到感温包安装的位置,而导致感温包温度的迅速变化。



3、热力膨胀阀具体调整步骤是:

        一、停机,将数字温度表的探头插入到蒸发器回气口处)的保温层内。将压力表与压缩机低压阀的三通相连。二、开机,让压缩机运行15 分钟以上,进入稳定运行状态,使压力指示和温度显示达到稳定值。三、读出数字温度表温度T1 与压力表测得压力所对应的温度T2,过热度为两读数之差T1- T2。


        热力膨胀阀是冷水机组中不起眼但也至关重要的部件,定期检查、维修和调整热力膨胀阀,对冷水机组的运行寿命及节能省钱方面有着重要意义。冷水机膨胀阀维修是一个专业活,需找专业售后或维修公司前来维修方可。如果您家遇到热力膨胀阀出现问题,请不要着急,迅速拨打热线:4006345365,这里有具体的维修方案等着你。
 
 

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