复现锡凝固点的中温热管固定点炉,需要选择合适工质的中温热管。研制了2根以N-甲基吡咯烷酮(NMP)为工质的重力热管(1#,2#),并在同等定温加热条件下对其启动特性和等温特性进行实验研究。结果表明:2#热管启动时间快于1#热管,且启动后稳定性优于1#热管;初步证实NMP热管在170~320℃温度范围内可运行;此外,制作工艺可影响热管的启动特性和等温特性,在相同的运行条件下,热管制作工艺越合理,热管冷凝段上部温度相对越高。
Abstract
A medium-temperature heat pipe fixed-point furnace that reproduces the freezing point of tin needs to select a medium-temperature heat pipe with a suitable working medium. Two gravity heat tubes(1#, 2#)with N-methyl pyrrolidone (NMP)as working fluid were developed, and the experimental study on the start-up characteristic and isothermal performance of NMP heat pipe under the same constant temperature heating conditions were carried out. The results showed that the start-up time and the stability of No.2 heat pipe is superior to the No.1 and the NMP heat pipe can be operated in the temperature range from 170℃ to 320℃. In addition, the start-up characteristic and isothermal performance can be affected by the fabrication process of the heat pipe. Under the same operating conditions, the more reasonable the heat pipe fabrication process, the higher the upper temperature of the heat pipe condensation section.
关键词
计量学 /
N-甲基吡咯烷酮热管 /
启动特性 /
等温特性 /
锡凝固点
Key words
metrology /
N-methyl pyrrolidone heat pipe /
start-up characteristic /
isothermal performance /
tin frozen point
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基金
国家重点研发计划项目(2017YFF0205901)
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