变频调速控制多腔液压缸液压系统节能研究

Energy Saving Research of Hydraulic System Based on Multi-chamber Cylinder with Speed Variable Pump

由于能量密度高、结构紧凑和噪声低,电液控制系统被广泛应用于工业生产中。定转速电机驱动变量泵系统为了匹配控制系统执行器速度以及多执行器功率,电机和泵都按系统最大功率匹配,电机在部分负载工况下效率较低,甚至达到15%,并且变量泵也常工作在小排量区,导致电液动力源在部分负载工况下效率更低。为此提出变转速电动机驱动定量泵方案,并采用多腔液压缸,在低负载功率需求下,采用小面积油腔连接方式,在高负载功率下,采用大面积油腔连接方式,从而提高电动机能量效率,进而提高系统能效。

Due to the high energy d ensity, compact structure and low n o ise, the electro-hydraulic control system is widely used in the industrial equipment. To the system with variable displacement pump driven by a constant speed electric motor, its electric motor and pump are selected to meet the system^ maximum power and match the cylinder speed. Th us, the energy efficiency of the motor is low under partial load, even only 1 5 % . And the pump often works under small displacement condition, which reduces the energy efficiency of the electro-hydraulic power source. In or-der to solve these problems, a variable speed motor drive quantitative pump scheme is proposed, and a multi-chamber cylinder is introduced to improve the system energy efficiency. According to the performance of the electro-hydraulic power source, the small area chamber and big area chamber are selected under low and high power need.