摘要
在不改变原液压系统的前提下,为避免液压系统节流损失,回收压差能、制动动能和重力势能,提出了一种进出口等流量四口液压变压器。阐述了四口液压变压器的基本结构和运行原理,其配流盘上均匀分布有四个形状大小相同的腰形槽,通过调节配流盘控制角可以改变其变压比,其中A和B口等流量组合相当于液压马达,0和T口等流量组合相当于液压泵。建立了四口液压变压器的排量、转矩及变压比数学模型,通过偏导法得出负栽回路流量、回收压差和油液粘度等因素与变压比的关系,通过Matlab仿真分析得到以上因素对变压比的影响规律。理论分析和仿真结果表明,在配流盘控制角不变时,随着负栽回路流量和回收压差的增加变压比降低,而随着油液粘度的降低变压比增大。
In order to avoid throttling loss and recover differential pressure energy,braking energy and gravitation al potential energy without changing the original hydraulic system,the four-port hydraulic transformer with inlet and outlet equal flow(FHT),which can be directly connected to the original hydraulic system,is proposed.First,the basic structure and principle of the FHT are explained,the main characteristic of FHT is that there are four waist shape slots of the same size and shape in the valve plate,and the pressure ratio can be changed by ad justing the control angle of the valve plate,and the flow rate of port A is the same as port B,the combination of port A and B is equivalent to a hydraulic motor,the flow rate of port O is the same as port T,and the combination of port O and T is equivalent to a hydraulic pump.Then,the mathematical models of displacement,angular torque and pressure transformation ratio about the four-port hydraulic transformer are built.Moreover,the relation ship between pr^ssur^transformation ratio and flow of the low-pr^ssur^port,recycling pressure difference and oil viscosity are obtained by using the method of partial derivation,based on this,the influence characteristics of the three factors on pressure transformation ratio are got by MATLAB simulation.Finally,the result of theoretical a nalysis and simulation shows the increase in fow rate of load circuit results in decreasing the pressure transforma tion ratio,while the decrease of oil viscosity and the increment of recycling pressure difference result in increasing pressure transformation ratio.
作者
周连佺
刘强
刘成强
薄晓楠
张楚
Lian-quan ZHOU;Qiang LIU;Cheng-qiang LIU;Xiao-nan BO;Chu ZHANG(Jiangsu Normal University,Tongshan Borough,Xuzhou 221116,China;Xuzhou University of Technology,Yunlong Borough,Xuhou 221116,China)
出处
《机床与液压》
北大核心
2020年第18期137-145,共9页
Machine Tool & Hydraulics
关键词
液压变压器
变压比
负栽回路流量
油液粘度
回收压差
Hydraulic transformer
Pressure ratio
Load fow circuit
Oil viscosity
Recycling pressure difference
