串联齿轮泵变相位角脉动特性及振动抑制试验研究

Experimental study on the variable phase angle pulsation characteristics and vibration suppression of tandem gear pumps

针对大流量串联泵存在的压力脉动与振动冲击问题,提出串联外啮合齿轮泵变相位角的减振降噪方法,推导出串联外啮合齿轮泵的瞬时流量及脉动不均匀系数的数学方程,理论分析串联外啮合齿轮泵不同相位角的瞬时流量脉动,分析变相位角时脉动不均匀系数的变化规律,并推导流量脉动与压力脉动的关系。针对实际相位差为0°和20°的串联泵,在串联泵出口处设置了双节流阀的负载来获得不同工况的压力脉动。推导出的压力脉动与试验值吻合,压力脉动是由一系列i次谐波组成的,频率与流量脉动相同,但振幅和相位与流量脉动不同。且试验测得20°相位角串联泵的压力脉动率比0°的降低了34.05%,20°相位角串联泵可以降低0°相位角时大部分频率下的振动幅值。串联泵变相位角可以降低流体脉动导致的振动幅值,且变相位角并未对串联泵的出口流量带来影响。

Aiming at the problems of pressure pulsation and vibration impact in large flow tandem pumps,a vibration reduction and noise reduction approach for tandem external gear pumps with variable phase angle was proposed.The mathematical equations for the instantaneous flow rate and pulsation non-uniformity coefficient of tandem external gear pumps were derived.The instantaneous flow pulsation of tandem external gear pumps with different phase angles was theoretically analyzed,and the variation of the pulsation non-uniformity coefficient with the change of phase angle was analyzed.The relationship between flow pulsation and pressure pulsation was derived.For the tandem pumps with actual phase differences of 0°and 20°,a double throttle valve was installed at the outlet of the tandem pumps to obtain the pressure pulsation under different operating conditions.The derived pressure pulsation is consistent with the experimental values.The pressure pulsation is composed of a series of i-th harmonics,with the same frequency components as the flow pulsation,but with different amplitudes and phases.The experimental results show that the pressure pulsation rate of the 20°phase angle tandem pumps decreases by 34.05%compared to that of 0°tandem pumps.The 20°phase angle tandem pumps can reduce the vibration amplitude at most frequencies compared to the 0°phase angle tandem pumps.Changing the phase angle of tandem pumps can reduce the vibration amplitude caused by fluid pulsation,and the variable phase angle does not have an impact on the outlet flow rate of the tandem pumps.