双螺杆多相流混输泵是用于油气混输的增压装置 ,回流是影响多相泵性能的重要因素 .通过对双螺杆油气多相流混输泵的几何解析 ,建立了不同形状回流通道的回流模型 ,回流量与压差、含气率有关 ,随着含气率的提高 ,回流量减少 ;压差增大 ,回流量提高 .可以利用气体的可压缩性 ,降低双螺杆多相流混输泵的回流量 ,从而提高其容积效率 . The twin-screw multiphase flow mixing pump is used to pressurize the oil and gas, and the return flow is an important factor that affects the performance of the multi-phase pump.Through the geometric analysis of the double-screw multiphase flow mixing pump, different shapes of reflux Channel backflow model, the return flow and pressure, gas-bearing rate, with the gas content increases, the return flow decreases; pressure increases, the return flow rate can increase the gas can be used to reduce the compressibility of the twin-screw polyphase Flow mixed pump return flow, thereby increasing its volumetric efficiency.