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熱搜關鍵詞： 離心風機高壓風機防爆風機玻璃鋼風機高溫風機

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爲什麽風機轉子會具有臨界轉速?

來源： | 發布日期：2022-11-26

答:離心風機轉子上的各個部件都是制造得很精密的，同時在裝配時又經過了平衡校正，但是風機轉子的重心還是不可能完全和主軸的中心相吻合。由于軸的中心和轉子重心之間有偏心，因此在主軸旋轉時就産生離心力，這是造成離心風機振動和主軸彎曲的主要原因。

转子旋转时，重心随着轴中心线而转动，离心力也随着转动。当轴每转一周，就产生一次振动。这是离心力引起的对转子的强迫振动，每秒钟产生强迫振动的次数叫做强迫振动的频率。

任何弹性体本身都有一定的自由振动频率。例如，若把一根钢丝两端固定，在中间用锤敲一下，钢丝就开始上下往复地振动，这时钢丝每秒钟振动的次数就称为其自由振动频率。

高转速风机的转子，也具有一定的自由振动频率，而离心力则会引起转子的强迫振动。当转子的强迫振动频率和转子的自由振动频率相重合时，也就是离心力方向变动的次数，引起转子强迫振动的频率和转子自由振动的频率相同或成比例时，就产生了共振。此时，转子的振动最大。这一转速就称为转子的临界转速。因为轴有多阶的固有频率，故轴有多阶的临界转速，分别称为一阶临界转速、二阶临界转速……

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【本文標簽】離心風機高壓風機防爆風機玻璃鋼風機高溫風機

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