【作者】 刘赟； 陈非凡； 虞璐伊； 李洪才；

【Author】 Liu Yun Chen Feifan Yu Luyi Li Hongcai (Dept.of Precision Instruments and Mechanology Tsinghua University Beijing 100084 China)

【机构】 清华大学精密仪器与机械学系；

【摘要】 本文介绍了一种基于风扇强制空气对流散热的局部环境控制系统,该系统适用于各类需要恒温工作环境且自身功率较大的精密仪器设备。系统采用双腔结构,仪器设备安装在密闭内腔体中,而内腔体与外腔体间通过空气进行热隔离。仪器设备工作时产生的热量通过散热器内外表面的空气对流及散热器自身热传导传递给外环境。系统采用动态热平衡伺服控制策略进行恒温控制。试验表明,发热量为200W的仪器设备置于系统内环境,在内外环境温差不低于7℃的条件下,该系统的温控精度为0.1℃。更多还原

【Abstract】 A local constant temperature environment system using forced air convection is implemented in this paper.It has a dual-chamber structure for high-powered scientific instruments which need clean and constant temperature environment when working.The scientific instrument is located inside an air-sealed inner chamber and the inner chamber is installed thermo-isolatedly inside an outer chamber.The heat generated by the scientific instrument is transferred to outside environment by forced air convection at both sides of the heat exchangers and the heat conduction of the heat exchangers.A dynamic thermal equilibrium servo temperature control strategy is implemented in this system.One scientific instrument,which generates about 200W heat dissipation during operation,has been placed into the inner chamber.The results indicate that,under the condition that the temperature difference between the inner chamber and the outside environment is not less than 7℃,such a temperature control system can provide good temperature accuracy better than 0.1℃,which is sufficient for most scientific instruments.更多还原