Abstract
High response, stable operation, small volume active vibration damping system and other intelligent hydraulic equipment have become the inevitable trend of future development. A compact low-pulsation gerotor pump is designed to meet these requirements, the theoretical flow pulsation of 8/9 tooth gerotor pump is analysed, and its pressure pulsation characteristics are also studied in this paper. The combined pulsation buffer is placed at the bottom valve plate high-pressure port of pumps. High-pressure oil passes through the honeycomb damping hole and enters the diaphragm volume chamber of the accumulator to form a combined pulsation buffer. Considering the effect of the pulsation buffer structure to reduce flow pulsation at different speeds, a test bench for high-speed gerotor pump pulsation characteristics is built, and the pressure pulsation of the gerotor pump with and without pulsation buffer is analysed at different speeds. Results show that the pressure pulsation frequency increases with pump speed. When the speed reaches 5500 r/min, 8/9 tooth gerotor pump without pulsation buffer outlet pressure pulsation reached 13.797% and that with pulsation buffer outlet pressure pulsation decreased to 9.871%, showing a 28.46% decline rate. At pump rotation speeds are 1500 r/min and 2500 r/min, the pulsation reduction ratios are 37.78% and 35.36%. The pressure pulsation of the gerotor pump can be evidently reduced by designing a combined pulsation buffer in this paper. Therefore, this high-speed and low-pulsation gerotor pump is suitable for active vibration damping system and other intelligent hydraulic equipment.
Highlights
The gerotor pump is often used in lubrication oil system for internal combustion engines and hydraulic system power device [1]–[4]
Liu Ying-Yuan studied the effect of working condition on pressure pulsations of an internal gear pump, the results indicate that working pressure has a significant effect on pressure fluctuation of the internal gear pump, while the rotating speed has a complex influence on the pressure pulsation behavior [16]
We focus on the need for analysing the cause of the flow pulsation of 8/9 tooth gerotor pump and designing a compact structure gerotor pump with pulsation buffer to reduce the gerotor pump pressure pulsation, researching the effect of the pulsation buffer structure to reduce flow pulsation at different speeds, building a test bench for high-speed gerotor pump pulsation characteristics and experimentally analysing the pressure pulsation of the gerotor pump with and without pulsation buffer at different speeds
Summary
The gerotor pump is often used in lubrication oil system for internal combustion engines and hydraulic system power device [1]–[4]. The results show that the designed compact structure 8/9 tooth gerotor pump with pulsation buffer can remarkably reduce pressure pulsation and suitable for vibration damping system to improve stability. WORKING PRINCIPLE AND TOOTH PROFILE DESIGN OF GEROTOR PUMP Active vibration damping system gerotor pump is an internal gear pump comprising an inner and outer rotor with eight and nine teeth in this paper. This pump has nine contact lines and forms nine volume chambers.
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