单作用直线电机三缸往复泵运动特性研究

针对传统单作用三缸往复泵结构复杂，排量、压力波动大，排量调节困难等缺点，提出了一种采用直线电机驱动技术的单作用三缸往复泵，介绍了该往复泵的工作原理，提出了能使该种往复泵理论上实现“恒排量”的运动规律和运动相位，讨论了运动相位误差对往复泵排量波动的影响。研究结果表明，在给定运动规律和运动相位下，往复泵的冲程和控制系统的控制精度是影响其排量不均匀度的主要因素，控制精度越高，冲程越长，排量不均匀度越小。通过实例计算可以看出，单作用直线电机三缸往复泵不需设置排出空气包就可以使排量不均匀度达到曲柄滑块机构单作用三缸往复泵的使用高性能排出空气包的水平。研究结果为开发新型的“恒排量”往复泵及其控制系统的设计提供了理论依据。

THE RESEARCH ON MOTION CHARACTERISTICS OF TRIPLEX SINGLE-FUNCTION RECIPROCATING PUMP DRIVEN BY LINEAR MOTORS

In accordance with the disadvantages of traditional triplex single-function reciprocating pump，such as the big fluctuating limit of discharge and pressure and the difficulty to adjust discharge and so on，a kind of triplex single-function reciprocating pump driven by linear motors is put forward.The operating principle of this reciprocating pump is introduced，the motion characteristics and phase is brought forward，which can achieve “constant discharge rate”，the influence of motion phase error on fluctuating limit of discharge is discussed.The research results show，based on the given motion characteristics and phase，the main influencing factors of fluctuating limit of discharge are the length of stroke of pump and accuracy of its controlling system，the higher the accuracy is and the longer the length of stroke is，the lower the fluctuating limit of discharge is.Calculating example shows，without air chamber，triplex single-function reciprocating pump driven by linear motors can achieve the fluctuating limit of discharge of crank-sliding block triplex single-function reciprocating pump with air chamber.The research results provide the theoretical fundamental for developing new style “constant discharge rate” reciprocating pump and designing its controlling system.