热管恒温槽校准工业用短型温度计的可行性研究

Feasibility Study on Calibration of Industrial Short Thermometers with Heat Pipe Thermostatic Bath

在(200~500)℃范围内,热管恒温槽是一种替代油槽和盐槽的清洁恒温源。受传热效率的限制,热管恒温槽在校准短型温度计时会产生较大的偏差。本文从传热学角度分析了短型温度计校准中偏差产生的原因。分析证明,在校准过程中,通过增大接触面积,提高换热系数的方式可以有效强化传热,减小因传热造成的偏差。实验表明,通过增加辅助金属环的方式能够有效提高传热效率,提高测量准确度,降低对被测温度计浸没深度的要求,完成工业用短型温度计的校准。

In the range of(200 ~ 500)℃,heat pipe thermostatic bath of is a kind of clean thermostatic source compared with oil bath and salt bath. Due to the limitation of heat transfer efficiency,there will be a large deviation when calibrating short thermometers. This paper analyzed the causes of the deviation in the calibration applied heat transfer method. The analysis shows that in the calibration process,by increasing contact area and heat transfer coefficient,the heat transfer can be strengthened effectively and the deviation caused by heat transfer can be reduced.The experimental results showed that the method of adding auxiliary metal ring could effectively improve the heat transfer efficiency,improve the accuracy of measurement,reduce the requirements of immersion depth of the thermometers to be measured,and calibration of industrial short thermometer can be realized.