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

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (10) : 44-51.

ZHAN Peng1，QIANG Yan1,2，WEI Liejiang1,2，FENG Zhengshun1，LUO Xiaomei3

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Abstract

Aiming at the problems of pressure pulsation and vibration impact in large flow tandem pumps, a vibration reduction and noise reduction approach with variable phase angle for tandem external gear pumps is proposed. The mathematical equations for the instantaneous flow rate and pulsation non-uniformity coefficient of tandem external gear pumps are derived. The instantaneous flow pulsation of tandem external gear pumps with different phase angles is theoretically analyzed, and the variation law of pulsation non-uniformity coefficient when changing phase angle is analyzed. The relationship between flow pulsation and pressure pulsation is derived. For tandem pumps with actual phase differences of 0 ° and 20 °, the double throttle valve is installed at the outlet of the tandem pump to obtain 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 as the flow pulsation, but different amplitudes and phases. And the experimental results showed that the pressure pulsation rate of the 20 ° phase angle tandem pump decreased by 34.05% compared to 0 °. The 20 ° phase angle tandem pump can reduce the vibration amplitude at most frequencies at 0 ° phase angle. Changing the phase angle of a tandem pump 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 pump.

Key words

pressure pulsation / flow pulsation / tandem gear pump / changing the phase angle / vibration suppression

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ZHAN Peng1，QIANG Yan1,2，WEI Liejiang1,2，FENG Zhengshun1，LUO Xiaomei3. Experimental study on the variable phase angle pulsation characteristics and vibration suppression of tandem gear pumps[J]. Journal of Vibration and Shock, 2024, 43(10): 44-51

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