Pressure sensing valve plate mechanism for ripple reduction of variable pressure piston pump
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摘要: 配流盘减振结构是从根源上降低液压系统压力脉动的最有效途径.为使柱塞泵在大范围变化的工作压力点上均具有自适应性,提出一种新型的压力敏感减振结构,采用孔槽组合、在通油孔和排油腔之间串联一个单向节流阀,节流阀开度随着柱塞泵工作压力的提高而增加,以获得所需的预升(降)压特性.优化设计出一种新型的压力敏感减振配流盘,并建立其数学模型.仿真结果表明:该减振结构减振效果明显,对工作压力变化具有良好的自适应性,其压力脉动值相比传统三角槽配流盘可多降低高达27.7%.Abstract: The silencing structure of the valve plate is the most effective approach to reduce the pressure ripple in the hydraulic system via reducing the source flow ripple. To endue the piston pump with self-adaptability at the operating pressures over a wide range, a novel pressure sensing silencing structure based on the hole-groove combination was developed for the valve plate. A one-way throttle valve, with its opening in conformity to the operating pressure, was inserted into the passageway between the communication hole and the delivery port to obtain required pre-pressurization (pre-relief) characteristic. A novel pressure sensing silencing valve plate was designed and optimized, and a simulation model of the novel valve plate was produced. The simulation results demonstrate that the novel valve plate achieves an obvious silencing effect and excellent self-adaptability under the condition of variable operating pressures, and its reduced value of pressure ripple is up to 27.7% over that of traditional valve plate with V-type relief groove.
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Key words:
- piston pump /
- variable pressure /
- pressure ripple /
- valve plate /
- optimization
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