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冷水机组四大件之热力膨胀阀常见故障分析

2016-06-15 16:07:09   来源:http://sxt.qblzl.com/       
导读:热力膨胀阀是冷水机组制冷系统四大件之一,当它发生故障的时候会引起连锁反应,导致一系列后果。那么我们就需要在膨胀阀出现问题的时候及时纠正,以下是膨胀阀发生故障时的现象,及原因分析
        热力膨胀阀是冷水机组制冷系统四大件之一,拥有着重要的作用。随着冷水机组的使用年限过长,或者是维护不断,都会引起热力膨胀阀的故障发生。今天小编要给大家分析的是热力膨胀阀常见故障的原因。

冷水机热力膨胀阀常见故障分析—热力膨胀阀的作用:

        热力膨胀阀由阀体、感温包、平衡管三大部分组成,在冷水机制冷系统中主要起着节流降压和调节流量的作用,同时它还有防止湿压缩和液击保护压缩机及异常过热的功能。

冷水机组热力膨胀阀常见故障分析—热力膨胀阀的常见故障排查分析:

        在现实生活维修中,有些冷水机组制冷系统的故障难以迅速定位,往往怀疑是热力膨胀阀的故障。这时,我们必须先了解整个冷水机组制冷系统的运行状态和外围相关部件的工作状态,不可胡乱拿热力膨胀阀来开刀。

故障一:膨胀阀提供的制冷剂流量太大。

现象:有液体进入压缩机;过热度低;吸气压力正常或稍高。
可能原因分析:


1、热力膨胀阀“冰堵”、“脏堵”、“蜡封”等,这些情况可能使膨胀阀流口固定在各种可能位置,所以,也有可能造成流量过大或过小。
2、膨胀阀口内部泄漏,密封不严。如果发生内部泄漏,压缩机停止后在膨胀阀处仍然可以听到“嘶嘶”的流动声音,同时,从视液镜看到液体仍在流动。当然,从视液镜观察液体流动情况时,要排除较高处制冷剂回流引起的干扰和气泡。确认有内部泄漏后,可以拆下流口组件检查密封情况,如果不能解决,就需要更换整个阀体了。
3、感温包安装问题。安装位置和方式不对,或者和回气管接触不好,或者感温包保温不好,都有可能造成供液过多。
4、热力膨胀阀过热度调整不当。

故障二:压缩机启动时,制冷剂流量较大。

现象:液体进入压缩机;没有过热度;吸气压力高于正常值。
可能原因分析:


1、机组安装不规范。由于管路流向、室内机室外机的相互位置安排不妥,造成停机时制冷剂向压缩机或蒸发器汇集,在突然开机时流量较大。
2、压缩机处于较低温度环境中。在压缩机较长时间停机状态下,制冷剂逐渐由温度较高处迁移到温度较低的地方,如果压缩处的温度较低,则可能汇集了很多制冷剂并与冷冻机油互溶。在压缩机开机时突然沸腾。这就是要求机组长期停机后欲开机之前,对机组通电预热的原因。
3、外平衡管堵塞。感测到的压力不能很快传递到阀体内,造成关闭力小,阀口开启较大。
4、液管上的电磁阀关闭不严。在停机时源源不断的为膨胀阀提供制冷剂,以至在低压侧内集聚。

故障三:制冷系统不稳定。

现象:吸气压力波动;吸气过热度波动;膨胀阀时而供液步骤,时而供液太多。
可能原因分析:

1、设计制冷系统特性不能抑制系统振荡,类似于常见的“共振”,系统不匹配。
2、选用的膨胀阀容量过大造成振荡。
3、蒸发器上负荷分布不均匀。如气流吹过蒸发器时不均匀,蒸发器盘管各回路内制冷剂分配不均匀等。
4、感温包安装位置不对。如果测到的是回气管中积存的冷冻油的温度,则容易出现振荡。
5、制冷剂中含有较多水分。可能造成膨胀阀时而冰堵,时而解冻正常工作的状态。

        在日常使用冷水机组时要定期检查和调整热力膨胀阀,对制冷设备的运行寿命,节约能源,降低运行成本,却有着重要的意义。冷水机组故障维修是一个专业活,需要寻找专业的清洗公司进行这项工作。

相关热词搜索:冷水机组热力膨胀阀常见故障

上一篇: 冷水机组热力膨胀阀的堵塞维修 堵塞原因
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