摘要：作为船用冷水机中回转式制冷压缩机的一种，螺杆式制冷压缩机同时具有活塞式和离心式两者的大致特点，功率方面比涡旋式的相对较大,由于其高效、耐久、容积效率高、结构紧凑和对负载进行平稳调节的特点，兼有了活塞式压缩机和离心式压缩机二者的优点，从而逐渐在一定制冷量范围内有逐渐取代活塞式和离心式制冷压缩机的趋势，在食品冷冻、冷藏、制冰、船用中央空调及工业制冷等领域广泛得到应用。考虑到船用螺杆式冷水机组工作环境的恶劣以及对控制控制系统的可靠性及易操作性的较高要求，本文针对螺杆式冷水机组控制系统采用了功能更强、体积相对较小、可靠性较高的PLCS7-200作为控制系统的主要核心，提出了主要电控系统设计方案，实现了对冷水机组的冷水泵、冷却水泵、油泵、压缩机的顺序启停的控制目的。同时对主要控制元件做出选型，做出了人机界面触摸屏，并设计出了符合要求的电控箱箱体。

关键词：冷水机组、PLCS7-200、触摸屏、电控箱

Abstract：As a kind of rotary refrigeration compressor in marine chiller, screw type refrigeration compressor has both the characteristics of both piston and centrifugal, and the power is relatively larger than that of scroll. Because of its high efficiency, durability and volume High efficiency, compact structure and smooth adjustment of the load characteristics, both the piston compressor and centrifugal compressor both the advantages of the gradual cooling capacity in a range of gradually replace the piston and centrifugal refrigeration compressor The trend in the food refrigeration, refrigeration, ice, marine central air conditioning and industrial refrigeration and other fields widely used. Considering the poor working environment of the marine screw chillers and the higher requirements for the reliability and ease of operation of the control and control system, this paper adopts the function of the screw chillers control system with the function is relatively small, the volume is relatively small and the reliability is High PLC S7-200 as the main core of the control system, put forward the design of the main electronic control system, to achieve the chiller of the cold water pump, cooling water pump, oil pump, compressor sequence start and stop control purposes. While the main control components to make selection, made a man-machine interface touch screen, and designed to meet the requirements of the electronic control box box.

Keywords:Chiller, PLC S7-200, Touch screen, Electric control box

目 录

第一章绪论 1

1.1船用冷水机组 1

1.1.1冷水机组的研究现状 1

1.1.2冷水机组功能及应用 1

1.2电控箱 2

1.2.1电控箱的功能 2

1.2.2电控箱设计理念 2

1.3可编程控制器PLC 2

1.3.1工作原理 2

1.4本文研究主要内容 3

1.5本章小结 4

第二章螺杆式冷水机组 5

2.1基本情况 5

2.2主要功能、特性 5

2.2.1主要功能 5

2.2.2主要性能指标 5

2.3工作原理 6

2.3.1半封闭螺杆式制冷机组