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                                                                                                                                                                      1. 首页 >> 技术文章 >> 如何解决低温冷冻机制冷系统的故障

                                                                                                                                                                        如何解决低温冷冻机制冷系统的故障

                                                                                                                                                                      2. 发布日期:2022-08-23      浏览次数:58
                                                                                                                                                                        •   低温冷冻机主要作用于塑料加工机械成型模具,将冷冻水注入模具内部的流道,通过热交换对模具进行冷却恒温,将温度维持在一个恒定的状态,以满足生产工艺的需求。在此过程中,模具就相当于一个换热器。
                                                                                                                                                                            低温冷冻机蒸发器盘管上的结霜,一股不应超过3mm,若结霜过厚,导致热阻增加,使蒸发器与低温冷冻机间有一定的传热温差,制冷剂在蒸发器中也吸收不到充分的热量来汽化,大量制冷剂在回气管路上吸热汽化,使回气管路结霜增加;另外,由于膨胀阀感受的过热度过小甚至为零,致使其关小或关闭,压缩机很快低压停车。但电磁阀未关,低温冷冻机还存在一定的热负荷,蒸发器压力回升后压缩机再次启动,造成启动频繁。蒸发器结霜越厚,这种情况就越严重。
                                                                                                                                                                            测试低压控制器时应慢慢关小压缩机吸人截止阀,注意吸人压力表的指示值,压缩机停车和重新启动时的指示值即为低压控制器的上限和下限。试验高压控制器可慢慢关小压缩机排出截止阀,读出排出压力表在压缩机停下时的读数,即为高压断开压力。试验前要证实压力表可靠;排出阀不应全关,以保安全。
                                                                                                                                                                            在正常供电的情况下,把冷冻机的控制箱的空气开关合上,这个时候冷冻机电源保护器上的指示灯就会亮,一般情况下,红色表示供电,黄色表示电源正常,只有红色亮的话,就说明低温冷冻机的电源缺少一项或者顺序不正确,确认好供电正常的话,但是如果电源保护器的指示灯不亮的话,就是保护器已坏。这个时候需要根据这些原因判断是否缺相还是反相,可以找出电源少的一相进行排除以及调换不对的顺序,或者更换冷冻机的电源保护器。

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