Use of helical gear in gear pump is an effective measure, which can reduce the mechanical voice and flow pulse.
齿轮油泵采用斜齿轮是降低机械噪声和减小流量脉动的一种有效措施。
Because of superior performance of helical axial-flow multiphase pump, multiphase boost technology has taken the developing position for liquid-gas boosting technology recently.
多相混输技术是当今油气输送技术的发展趋势，而螺旋轴流式多相泵应用于油气水多相混输具有良好的性能。
In this paper, based on the work mechanism of the flow pump, gas ingestion and failure of helical seal are fully explained. Moreover, a new type of combined helical seal is put forward.
本文从泵的角度对螺旋密封“气吞”及“密封失效”现象作出了合理、全面的解释，并提出一种新型组合螺旋密封。
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