“8”字形盘密封螺旋泵排液特性

Discharge characteristics of "8"-shaped disc seal screw pump

圆盘密封螺旋泵具有排量大、磨损小、介质适应性强等优点,但其使用过程中存在振动大、不能实现完全的自驱动等问题。针对这些问题,提出“8”字形盘密封螺旋泵,基于其工作原理构建泵送过程的几何模型,建立“8”字形密封螺旋泵排液体积的数学模型,分析啮合副型面参数对排液过程工作特性的影响机制。结果表明:单个转动周期内螺杆增压段螺槽被密封盘分为两个腔室,“8”字形盘密封螺旋泵排液体积较同半径下的圆盘密封螺旋泵提高了约55.7%;排液体积随密封盘大圆半径、密封盘过渡圆弧半径、螺杆半径变化均呈近似正比例线性关系。

The disc seal screw pump(DSSP)has the advantages of large displacement,small wear,strong medium adaptability,and so on.However,there are some problems with its use,such as there exists large vibration,and it is unable to achieve the complete self-drive.Given these problems,an"8"-shaped disc seal screw pump("8"-DSSP)was proposed.Based on the working principle of the"8"-DSSP,the geometric model of the pumping process was constructed.Then the mathematical model of the discharge volume of the"8"-DSSP was established,and the influence mechanism of the profile parameters of the meshing pair on the working characteristics of the discharge process was analyzed.The results show that,in one rotation cycle,the screw groove of the pressurization section is divided into two chambers by the sealing disc,and the discharge volume of the"8"-DSSP is about 55.7%higher than that of the DSSP under the same radius.The discharge volume is linearly proportional to the change in the radius of the big circle,the radius of the transition arc and the radius of the screw.