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压力平衡系统是设计密封轴承牙轮钻头时不可忽视的问题。其作用是平衡钻头轴承腔内外的压力差,保证轴承在良好的密封和润滑条件下工作。这对提高密封轴承钻头的工作时间起着重要的作用。本文所介绍的是1973年公布的美国专利(专利号3,719,241、3,721,306、3,735,825)中提出的对原有密封钻头中的压力平衡系统进行改进的几种方案,供牙轮钻头设计人员参改。
Pressure balance system is designed to seal bearing roller cone bit can not be ignored. Its role is to balance the pressure difference inside and outside the bit bearing cavity, to ensure that the bearings in good sealing and lubrication conditions. This plays an important role in improving the working time of the sealed bearing bit. Described herein are several solutions proposed in the 1973 U.S. patents (Patent Nos. 3,719,241; 3,721,306; 3,735,825) for improving the pressure balance system in prior art sealed drill bits for use by cone bit designers.