少妇翘臀进入白浆

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新聞動態

液壓系統油溫升高的原因

日期:2021-04-02
液壓系統在工作中有能量損失,包括壓力損失、容積損失和機械損失三方面,這些損失轉化為熱能,使液壓系統的油溫升高。一般液壓系統的油溫應控制在(30-60)℃范圍內,最高不超過(液壓絞車60-70)℃。油溫升高會引起一系列不良后果:


(1)使油液粘度下降,泄漏增加,降低了容積效率,甚至影響工作機構的正常運動;


(2)使油液變質,產生氧化物雜質,堵塞液壓元件中的小孔或縫隙,使不能正常工作;


(3)引起熱膨脹系數不同的相對運動零件之間的間隙變小,甚至卡死,無法運動;


(4)引起機床或機械的熱變形,破壞原有的精度。


保證液壓系統正常工作溫度的措施:


1、當壓力控制閥的調定值偏高時,應降低工作壓力,以減少能量損耗;


2、由于液壓泵及其連接處的泄漏造成容積損失而發熱時,應緊固各連接處,加強密封;


3、當油箱容積小、散熱條件差時,應適當加大油箱容積,必要時設置冷卻器;


4、由于油液粘度太高,使內磨擦增大而發熱時,應選用粘度低的液壓油;


5、當油管過于細長并彎曲,使油液的沿程阻力損失增大、油溫升高時,應加大管徑,縮短管路,使油液通暢;


6、由于周圍環境溫度過高使油溫升高時,要利用隔熱材料和反射板等,使系統和外界隔絕;


7、高壓油長時間不必要地從溢流閥回油箱,使油溫升高時,應改進回路設計,采用變量泵或卸荷措施;
少妇翘臀进入白浆
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