The Cooling Systems' Exploration Of National Engineering Laboratory High-speed Train System Integration Testing Equipment

Speed is the soul of transport development. In particular, China Railway, which puts 337"harmony"groups of high-speed trains into operation, has improved the speed for the sixth time since April 2007,and the speed of trains has been gradually pushed to 300km/h or more. The high-speed train line during Beijing and Tianjin has reached a top speed of 394km / h, R&D and manufacturing technology of the high speed train jump to the international advanced level. On September 28th in 2010, in the test of Shanghai-Hangzhou high-speed rail operation, a new generation of high speed EMU named"Harmony"CRH380A with independent intellectual property rights, got the maximum speed of 416.6km/h. which refreshed the world top speed records. Currently, the EMU on the being built high-speed railway between Beijing and Shanghai is trying to get the top speed. The EMU with 380km/h will gallop from Beijing to Shanghai.Considering high-speed rail train driving safely and stability,laboratory testing on the main assembly and train is particularly important. The testing equipments will release lots of heat due to their high power when they are working. So if the heat can`t be removed immediately and properly, the equipment life and performance will be affected.The main cooling system ways of cooling equipment include air cooling, DC water cooling; open cycle water cooling, closed cycle cooling and air-water mixed cooling. Because of every cooling requirement in laboratory of cooling capacity, saving water, ease of maintenance and not easy to be corroded, meanwhile considering every cooling way`s advantages and disadvantages, finally the paper select closed cycle cooling water system as the cooling systems of National Engineering Laboratory High-speed Train System Integration.Premise of the paper in-depth studying project's requirement, this paper accurately calculates cooling capacity, From the point of energy conservation and rational distribution, the entire laboratory cooling system was designed. Established by the two cooling module including 6 cooling towers composite cooling system.The paper also researches softening method of cooling water, which exchanges calcium ions and magnesium ions in the water with sodium ions in the way of being adsorbed on the resin, effectively delaying the reasons of cooling equipment aging caused by the cooling medium.This paper designs laboratory test equipment for engineering cooling water cycle system, which can return of hot and cold water with the pipelines two cooling module and 3 of the towers block. In order to Reduce material consumption and reduce the space; with hot and cold water tank balanced pressure from various quarters to ensure that when multiple machines work simultaneously, the cooling system can be stable. With flexible connection piping and equipment to avoid transmission of vibrations to make up the pipeline sizing deformation; use one export one valve system, to ensure that multi-machine line sharing the independence of every machine; use semi-underground tank installation, the water level to form a gap with the tower to ensure the reliability of the cooling water return.Paper uses temperature and flow monitoring system, real-time monitoring of the work of the cooling system to prevent insufficient cooling capacity of test equipment work properly.Paper developed by the cooling system has been test evaluation, test run to prove that the development of the cooling system to meet the design requirements, to meet the cooling capacity of National Engineering Laboratory High-speed Train System Integration Testing Equipment.