1、冷媒自动充填机控制系统设计 I 摘 要 冷媒自动充填机是冰箱、空调生产线上的重要设备,专为冰箱、空调加充冷媒剂。 本设计要利用PLC控制灌注机自动填充冷媒。 针对目前国内冷媒填充使用状况和存在的问题，本论文综合运用了可编程控制器 变频器、传感器等现代工业控制常用的控制部件及其相关程序设计方法,利用 PLC 控制 计量电动机完成冷媒剂的灌注工作， 用 PID 调节灌注泵和真空泵进行数字化定量填充以 检漏，同时对冷媒通道中的温度和压力进行实时测量和控制。通过温度检测仪和压力检 测仪检测温度和压力灌注冷媒是否到达要求，并且提出了基于 PLC 冷媒填充装置控制 系统设计方案，给出系统硬件组成结构和软件
2、设计思想，详细介绍了关键电路的工作原 理，对系统的抗干扰措施进行了讨论。测试结果表明：本控制系统采用 PLC 进行实时 控制，冷媒的注入量的精度达到了1 g，达到了系统的设计要求。为中小型制冷系统维 修企业提供了低成本的维修工具，所做的研究对同类系统的研究和开发也具有一定的参 考价值。 关键词：冷媒充填；PLC； 温度; 压力; PID 冷媒自动充填机控制系统设计 II Abstract Refrigerant - stuffing is an important equipment that is on the refrigerator and the air conditioning pr
3、oduction line, which adds sufficient Refrigerant specially for the refrigerator and the air conditioning. This design which uses PLC control infusion machine automatic fills refrigerant. In view of the present domestic refrigerant filling using conditions and the existing problems, this paper uses p
4、rogrammable controller comprehensive inverter, sensors and modern industrial control commonly used control parts and related programming method, using PLC control measuring electromotor complete refrigerant agents work, make the perfusion digital quantitative filling and lead to cold media channels,
5、 and the temperature and pressure for real-time measurement and control. Is put forward based on PLC refrigerant filling equipment control system design scheme, give system hardware structure and software design thought, detailed introduces the working principle, key circuits of system anti-interfer
6、ence measures are discussed. Test results show that this control system adopts PLC for real-time control, refrigerant injection quantity of accuracy reached 1 g, achieve the design requirements of the system. For small and medium-sized refrigeration system maintenance enterprises to provide low-cost maintenance tools, done the research of similar systems research and development has the certain reference value. Keywords: Refrigerant-stuffing; PLC; Temperature; Pressure; PID 冷媒自动充填机控制系统设计 1
