真空绝热保温瓶温升规律试验研究

Experimental study on temperature rise of the vacuum flask

摘要:

超高温钻孔轨迹测量仪是专为高温环境下的钻孔轨迹测量而开发的一种新型存储式测斜系统，以真空绝热保温瓶作为阻隔高温环境的主要手段，由于真空绝热保温瓶具有较大的长径比，其内部有效利用长度达到2.0 m左右，为了解在外界环境温度一定时，其内部沿轴向方向温升值的差异规律，为探管结构的合理布设提供依据，特别开展了本次试验研究。通过2只保温瓶的室内试验，获得了不同环境温度下的保温瓶内部温升值，通过对实测数据的分析，保温瓶内部温升规律主要有3个方面：一是温升值随时间基本为线性关系，温升速率随环境温度增加而加快；二是温升值与环境温度成3次曲线关系；三是保温瓶内部温升值由两端到中间逐步减小，中间部位温升值明显低于其两端。利用试验结果对探管结构进行了合理化的布设，采取了针对性的应对措施，确保了仪器工作温度指标达到项目考核要求，该试验结果也可为其他类似高温仪器的结构布设提供参考。

Abstract:

The ultrahigh temperature drilling trajectory measurement instrument is a new type of storage inclinometer system specially developed for drilling trajectory measurement in high temperature environment，with the vacuum flask as the main means of insulation from high temperature environment, since the vacuum flask has a large length/diameter ratio with the internal effective use length up to 2.0m. In order to understand the law of temperature rise in the axial direction of the vacuum flask when the external environment temperature is fixed, and provide a basis for the reasonable arrangement of the probe tube structure, this experimental study has been conducted. Through the laboratory test of two vacuum flasks, the internal temperature rise value of the vacuum flasks in different ambient temperatures was obtained. Through the analysis of the measured data, the internal temperature rise law of the vacuum flasks was found to include three main aspects: first, the temperature rise value is basically linear with time, and the temperature rise rate increases with the ambient temperature; second, the temperature rise value is a function of the ambient temperature in a cubic curve; third, the internal temperature rise value of the vacuum flask gradually decreases from both ends toward the middle, and the temperature rise value of the middle part is significantly lower than that of the two ends. Based on the test results, the layout of the probe tube structure has been rationalized with specific measures taken to ensure that the working temperature index of the instrument meets the specified requirements. The test results can also provide a reference for the structural layout of other similar hightemperature instruments.