Principle of maintenance necessity of Roots blower:

羅茨風機凡使用過的零件，拆下來檢查，不外乎以下幾種情況：一是質量狀況尚好，或者雖有磨損但不作修理也可以繼續(xù)使用;二是存在缺陷，但經(jīng)過修復仍然可以繼續(xù)使用;三是有較大的缺陷，難以修復或修理價值不大，需要進行更換。

All used parts of Roots blower can be disassembled for inspection only in the following cases: first, the quality is good, or it can be used without repair even though it is worn; Second, there are defects, but they can still be used after repair; Third, there are large defects that are difficult to repair or have little repair value and need to be replaced.

檢查過程中，該修換的零件應及時修換，否則影響鼓風機的檢查質量。但如果對沒有影響的部位盲目進行修理，或者將本來可以繼續(xù)使用的零件提前更換，又會造成浪費，增加維修費用。因此，確定零件是否修換，總體上應遵循“有必要才修換”的原則。

During the inspection, the parts to be replaced should be repaired in time, otherwise the inspection quality of the blower will be affected. However, if the parts that are not affected are repaired blindly, or the parts that can be used continuously are replaced in advance, it will cause waste and increase maintenance costs. Therefore, the principle of "repair and replacement only when necessary" should be followed in determining whether to repair and replace parts.

羅茨風機維修可靠性原則：

Maintenance reliability principle of Roots blower:

有缺陷的零件需要修換，但究竟是修還是換，應遵循“能可靠使用”的原則。選擇修理的零件，修理后應當恢復或基本上恢復原有的制造精度，滿足整機對零件的技術要求。這些要求，通常包括零件的尺寸誤差，表面粗糙度，形位公差和表面硬度等。一般說來，磨損不太嚴重的機殼墻板和轉子等，經(jīng)過修復大都可以照舊使用，此類缺陷通常選擇修理;但軸承齒輪及油封等零件一旦損壞就難以修復，勉強使用往往帶來更大的麻煩，因此檢修時一般選擇更換。

Defective parts need to be repaired and replaced, but whether to repair or replace them should follow the principle of "reliable use". After selecting the repaired parts, the original manufacturing accuracy shall be restored or basically restored to meet the technical requirements of the whole machine for the parts. These requirements usually include the dimensional error, surface roughness, geometric tolerance and surface hardness of parts. Generally speaking, the casing wallboard and rotor that are not too worn can be used as usual after repair, and such defects are usually repaired; However, once the bearing gear, oil seal and other parts are damaged, it is difficult to repair them. Reluctantly using them often brings more trouble. Therefore, they are generally replaced during maintenance.

羅茨風機維修經(jīng)濟性原則：

Economical principle of Roots blower maintenance:

可以修復的零件是否一定進行修復，而不選擇更換，還應當對修理與更換的經(jīng)濟性進行比較。這種比較，不單是對零件的修理與重置費用進行比較，而是將修理費用和修理的使用時間進行權衡。

Whether the parts that can be repaired must be repaired rather than replaced, the economy of repair and replacement should also be compared. This comparison is not only to compare the repair and replacement costs of parts, but also to balance the repair costs and the service time of repair.