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'<p><img src="/uploads/allimg/20200320/1584687142177023.jpg" title="1584687142177023.jpg" alt="501658d7daec65f1a9e76f080363bdb.jpg"/><span style="font-family: 仿宋; text-align: center;">北京四环福瑞科仪科技发展（北京）有限公司</span></p><p><span style="font-size:21px;font-family:黑体">&nbsp;</span></p><p>&nbsp; &nbsp; &nbsp; &nbsp;<a href="http://www.bjshky.com.cn" target="_self"><strong>四环冷冻干燥机</strong></a>需要定期进行更换冻干机油，以确保冻干机的正常稳定工作，但并不是任何机油都是可以使用的，只有达到要求的冻干机油才能保障冻干机的正常运转，下面就为大家介绍一下，冻干机所用机油的标准。</p><p>&nbsp;</p><p><br/></p><p style="text-align: center;"><img src="/uploads/allimg/20190808/1565230765180585.jpg" title="四环冻干机" alt="四环冻干机" width="600" height="517" border="0" vspace="0" style="width: 600px; height: 517px;"/>&nbsp;</p><p><br/></p><p>&nbsp; &nbsp; &nbsp; &nbsp;1、粘度。它是评价油脂流动性能的指标，选择冷冻机油时应重点考虑这一性能。油的牌号一般也以其粘度值来标称.润滑油的粘度过低不能形成一定的油膜，使磨损加剧，但粘度过高又将使摩擦热增加，对启动和功率消耗不利。由于制冷剂R12与油混合后会使粘度下降，所以应选用粘度较高的润滑油。此外，制冷机外温条件变化很大，又要在这种工作温度下使用，要求润滑油的粘温性要好(即粘度随温度的变化范围小)。</p><p>&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp;2、浊点。关于浊点的定义可见我国石油工业部标准SYB2606-65。制冷机润滑油的浊点应该低。因为当蚀点高时，制冷机工作在低温工况下会析出石蜡而堵塞管孔。</p><p>&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp;3、凝固点。冷冻机油应有较低的凝固点，从而有较好的低温流动性，以便于回油。用于氟利昂制冷机(R12)的冷冻机油凝固点应低于-300℃，当油与R12混合后凝固点可下降10-15℃。对四环冻干机来说，这一凝固点已足够了。</p><p>&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp;4、闪点和自燃点。冷冻机油遇到明火后闪火，但即自灭而不燃烧的温度称为闪点，能自燃的温度称为自燃点。冷冻机油的闪点至少应比最高排气温度高10-15℃。由于R12制冷剂排气温度规定不能超过125℃(单级压缩机)，故润滑油闪点高于160℃就可以了。</p><p>&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp;5、抗氧化性及化学稳定性。制冷机的工作条件要求润滑油有良好的抗氧化安定性，否则润滑油会在高温下氧化分解，析出氧化物。当机组中含有水份时，油和R12在铜、铁、铝等金属催化下，会在高温下发生一系列的反应，产生酸类，腐蚀金属并进而产生镀铜和胶质化现象，轴瓦表面的胶质和压缩机部件镀铜就是由此产生的。</p><p>&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp;6、击穿电压和消泡性。为了防止油在管道中沉集，并且由于R12与油混合而在启动时产生的泡沫，润滑油应具有良好的消泡性。合成冷冻机油在加入硅油后消泡性明显改进。为了保护电机，半封闭式和全封闭式压缩机要求润滑油具有25-45千伏的击穿电压。</p><p>&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp;以上就是四环冻干为大家介绍的，冻干机机油的使用要求，在更换冻干机油时一定要选用达到使用标准的冻干机油，只有这样才能保障冻干机的正常工作，避免不必要问题的发生。</p><p><br/></p>'

'四环冻干,四环冻干机,四环冷冻干燥机'

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'四环冷冻干燥机需要定期进行更换冻干机油，以确保冻干机的正常稳定工作，但并不是任何机油都是可以使用的，只有达到要求的冻干机油才能保障冻干机的正常运转，下面就为大家介绍一下，冻干机所用机油的标准。'

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