In Roots blower, lubricating oil has the functions of lubrication, reducing friction, cooling, protection and washing. After a period of use, the lubricating oil will be polluted, aged and the leakage will be reduced. Therefore, in general, various fan equipment will set the corresponding replacement cycle according to the actual use.

当然实际应用中，罗茨风机是否需要更换润滑油不一定是一个固定的周期，根据油品性能的变化情况，其周期可能变短也可能变长，过早换会增加使用成本，过晚换会影响罗茨风机的性能，具体的要看润滑油实际的品质情况，关于它的判断可以通过几个方面来进行判断：

Of course, in practical application, whether the roots blower needs to replace the lubricating oil is not necessarily a fixed cycle. According to the change of oil performance, its cycle may become shorter or longer. Early replacement will increase the use cost, and too late replacement will affect the performance of Roots blower. The specific depends on the actual quality of lubricating oil. Its judgment can be judged from several aspects:

一看是否氧化变质。这点一方面可以通过外观进行分辨，看油的颜色是否变黑或加深，以及表面有无形成较硬的胶膜。另一方面，也可以取少量油箱底部的油泥置于食指和拇指之间进行捻压摩擦，如果感觉到胶质多、粘附性强，则说明润滑油己经严重变质，需要更换。

See if it is oxidized and deteriorated. On the one hand, this can be distinguished by appearance to see whether the color of the oil turns black or deepened, and whether a hard adhesive film is formed on the surface. On the other hand, you can also take a small amount of oil sludge at the bottom of the oil tank and place it between your index finger and thumb for twisting and friction. If you feel that there are many colloids and strong adhesion, it indicates that the lubricating oil has seriously deteriorated and needs to be replaced.

二是检查润滑油是否混入了较多硬粒杂质。这点与上面的检验方式一样，通过取少量润滑油用手指进行捻压，凭借感觉即可进行判断。

Second, check whether the lubricating oil is mixed with more hard particle impurities. This is the same as the above inspection method. It can be judged by feeling by taking a small amount of lubricating oil and twisting it with your fingers.

如果确定要进行润滑油更换时，需要注意避免新旧润滑油混合，清理干净旧油后再充入新油，另外在填充过程中，要注意油量。

If it is determined to replace the lubricating oil, pay attention to avoid mixing the old and new lubricating oil. Clean up the old oil and then fill it with new oil. In addition, pay attention to the amount of oil during filling.

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