多种气量调节模式下往复压缩机连杆小头瓦润滑特性

Simulation study on lubrication characteristics of the connecting rod small bearing of the reciprocating compressor under various capacity regulation modes

针对不同气量调节模式下往复压缩机气缸内部压力变化规律不一,进而影响连杆、活塞杆等运动部件受力,易造成连杆小端轴承磨损及对机组安全稳定运行不利的问题。建立了压缩机顶开进气阀无级气量调节工作模型,采用了不同调节方式控制参数,仿真模拟不同调节方式下缸内压力变化规律;建立压缩机多体动力学模型,基于弹性流体动力润滑理论,分析了双侧平衡调节、双侧不平衡调节、单侧调节等模式下的连杆小头瓦润滑特性与动力学行为。结果表明:平衡调节碰磨角波动在8°以内,对小头瓦润滑影响不大,不平衡调节、单侧调节对小头瓦润滑影响较大,应优先降低盖侧负荷且两侧负荷偏差应不超过40%。研究成果对气量调节系统工程方案与控制策略设计具有指导作用。

In different capacity regulation modes,the internal pressure change of reciprocating compressor cylinder is inconsistent,the force of moving parts such as connecting rod and piston rod is further affected,which is easy to cause wear of small end bearing of connecting rod and is very unfavorable for safe and stable operation of the unit.To solve this problem,a working model of stepless capacity regulation of the top-opening inlet valve of the compressor is established,and the control parameters of different regulation methods are introduced to simulate the pressure change law in the cylinder under different regulation methods.Further,a compressor multi-body dynamics model is established,and the lubrication characteristics of the connecting rod small head tile under bilateral balanced regulation,bilateral unbalanced regulation and single-side regulation are analyzed based on the Elastohydrodynamic lubrication theory.The results show that the rub impact angle fluctuation of balanced regulation is within 8 degrees,which has little effect on the lubrication of the small-head bearing,unbalanced regulation and single-side regulation have greater effect on small head tile lubrication.The cover side load shall be reduced preferentially and the load deviation on both sides shall not exceed 40%.The research results have a guiding effect on the engineering scheme and control strategy design of capacity regulation system.