
第28卷
第10期
文章编号:1006-9348(2011)100411-04
计算
真
机仿
2011年10月
新型液压驱动往复泵泵阀运动规律的仿真研究
霸武钊",吴万荣"2,周现奇”
(1.中南大学机电工程学院,湖南长沙410083;
2.长沙科达建筑机械制造股份有限公司,期南长沙410014)
摘要:在矿山机械作业过程的中,研究能否及时用水泵对机械装置进行清洗间题,传统式机械水泵存在压力波动大、难以实现高冲次以及动力源不稳定等缺点,难以涡足矿山机械的作业要求。为提高矿山机域的工作效率和系统稳定性,提出一种采用液压冲击机构驱动的往复式水泵,用以取代传统式机械水泵。在建立新型往复系数学模型的过程中,考虑液体的可压缩性和阀的动力特性,采用流体力学和理论力学的基本理论建立了被压累动往复式水系的数学模型。运用Malab选行数值仿真,得出水泵液缸内液体压力、阅芯的升程与阅芯速度随时间的变化规律,提高了机械工作效事。经伤真证明,新型往
复水系能够满足设计优化性能要求,为设计提供参考。关键词:往复式水泵;液压冲击机构:数学模型;数值伤真
中国分类号:TH321
文献标识码:A
Simulation of Law ofValve Motion
of New Hydraulic -Drive Reciprocating Pump WENG Wu - zhao',WU Wan - rong'-2,ZHOU Xian -qi
(1., College of Mechanical and Electrical Engineering of Central South Univensity, Changshas Hunan 410083, China;
2. Changsha KEDA Construction Machinery Mamufacturing Co. ,LTD, Changsha Hunan 410014, China)
ABSTRACT; In the process of mining machinery operstions, whether uses the pump to clean mcchanical devices playes a significant part in improving the efficiency of mining machinery. The existence of large pressure fluctuations, unstable power source, low frequency of stroke and other shortcomings in the traditional mechanical pumps was hard to meet the requirements of mining machinery. Based on the above issues, this paper presented a new type of hydrau-lic driven reciprocating pump. Driving mode was hydraulic impact machine, which can achieve the reciprocating motion of pump. In the process of establishing the mathematical model of reciprocating pump, comprehensive consid-eration of the compressibility of liquid and the valve dynamic characteristics of the valve, a mathematical model of by-draulie driven reciprocating pump was built. Using Matlab/Simulink for numerical simulation, the results of simu-link sbow the changing law of liquid pressure in the hydraulic cylinder of pump, the lift and the valve spool speed change with time. The oomputer simulation shows that the new reciprocating pumpes can meet the design requirements"paroad st poria jo kaiseeg al am Kray
KEYWORDS: Reciprocating pump; Hydraulie impact machine; Mathematical model; Numerical simulation
引言 1
在矿山作业过程中,需要经常对机械装置进行清洗,但存在的间题是,目前使用的往复水泵一般都是采用曲柄连杆传动的高压柱塞结构,压力波动大,但相对于离心案排量小,只能采取高冲次(300~400次/min),因而泵阅及柱塞泵寿
修回日期:2010-11-01
收稿日期:201009-05
命极短,密封极不可靠。除此之外,传统水泵需要电作为动力源,而矿山作业环境恶劣,经常不能提供电源。国内外研究者虽然在液压翌动往复泵方面取得了一定的理论研究成果,但仅限于吸人性能和容积效率的研究,并不能同时解决曲柄连杆式水泵存在的压力波动大,难以实现高冲次以及动力源不稳定等间题"]。因此针对上述间题,本文提出一种新型的往复水泵,根据液压冲击机构的运动特性,采用液压冲击机构作为动力传递装置,能够提供稳定动力源,实现大流
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