摘要
根据大型往复式压缩机顶开气阀气量无级调节系统的基本原理,建立气量无级调节系统作用下,压缩机进气阀自动阀工作方式时的阀片的运动微分方程以及气体流动的微分方程,分析阀片升程、阀隙马赫数、执行机构作用力撤销时刻对气阀动态过程影响;利用液压机械仿真平台AMESim,对执行机构控制下的阀片运动过程建立仿真模型,对其运动规律进行仿真研究。研究结果表明:阀片自动打开时,阀片的碰撞速度与阀片升程成正比,通过执行机构主动压开阀片可以控制这一速度;在气体回流的过程中,随着阀隙马赫数的增大,气缸内的压力明显升高,压力最高点相对于活塞速度最大值点有滞后;执行机构力撤消后,在阀片关闭过程中阀片速度远大于执行机构速度,其关闭过程受到执行机构的限制,二者以一个较小的速度一起运动;在执行机构控制阀片运动的工作方式下,阀片的运动速度不随着气阀升程增加而增大,而是保持在定值。
Based on the basis principle of stepless capacity control system for large reciprocating compressor,equations of suction valve and gas flow in the reflux process are established.The effects of valve lift,valve clearance Mach number,and time of removing actuator force on the dynamic characteristics of valve are analyzed.The dynamic characteristics of valve controlled by actuator are obtained by simulation platform AMESim.The results show that the impact speed of valve on valve stopper increases with the rise of valve lift.In the reflux process,the pressure in the cylinder rises obviously with the increase of Mach number,with a maximum apparently lagging behind the piston speed maximum.After removing actuator force,during the valve closing process,the speed of valve is limited by actuator,and they move together at a low speed.When the valve movement is controlled by actuator,the impact speed of valve keeps constant in spite of the increase of valve lift.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2011年第4期136-141,共6页
Journal of Mechanical Engineering
基金
国家重点基础研究发展计划资助项目(973计划
2010CB736006)
