精锻件余热回收冷却系统温度控制研究

摘要

目的 研究汽车连杆锻造工艺过程,分析余热回收系统冷却水循环路径,得出余热回收系统中热泵随温度变化的工作规律,提出能实现热泵自动按顺序启停和整个系统自动控制的方案.方法 分析连杆锻造工艺、冷却循环水系统工作过程及余热回收系统工艺流程,得出系统控制与温度变化间的逻辑控制关系;通过VB程序模拟冷却循环系统的温度控制,验证各控制元件在控制过程中响应节点信号的正确性.结果 确定了余热回收冷却系统温度控制的逻辑关系,得到了由温度变化来控制电动阀以及热泵启停的自动控制系统.经过VB程序模拟热泵、电动阀的开启、运行与时间的关系,证明该控制方案可行.结论 实现了余热回收冷却循环系统中冷却循环水和余热回收系统的自动控制,在满足工艺水要求的同时,不断利用回收的余热为车间持续供暖.%In order to realize the automation start-stop order of the three heat pump and the automatic control of the whole system as the temperature changed,the part of the cooling circulation system in waste heat recovery system and the connecting rod forging process were investigated in this paper.The temperature logic control relationship of the system was deduced through analyzing the forging production process and the cooling circulating water system and the process of waste heat recovery system;the correctness of the response of the electric valve and the heat pump in the control process was analyzed and verifiedthrough the VB program to simulate the cooling circulation system.The logical relation of the system temperature control was determined,and the automatic control system of the electric valve and the heat pump start-stop as the temperature change was obtained,it proves the feasibility of the control scheme through VB simulation of heat pump and time relationship.According to the temperature change,the automatic cycle of cooling circulating water in the waste heat recovery system can be realized,it can achieve the best results through the waste heat recovery system.