粉末冶金真空炉专用新型热电偶与在线原位校准

发布时间：2018-12-15 12:13

【摘要】：从粉末冶金行业的精确生产与优质高效的战略出发,简述粉末冶金行业用钨铼热电偶的特点、分类与使用。详细论述粉末冶金真空炉专用超高真空(10~5 Pa)、超高压(15 MPa)密封式热电偶及炉温均匀性测试等新型传感器。详细探讨真空炉测温准确度的影响因素:真空度、发射率、热导率、热响应时间及热电偶的插入深度、热电偶保护管的选择等;简介进口真空炉专用热电偶国产化研究,国内外温度传感器性能对比及替代进口真空炉热电偶的成功业绩。目前,对测温系统的检定,多采用分立元件法,即对构成测温系统的元件及仪表分别进行检定。此种检定方法是离线的。本文简述离线式检定方法的诸多弊端以及美国宇航标准(AMS 2750E)中,有关系统准确度校准的特点及要求。详细论述在线原位校准的最新理念,最佳的系统准确度校准方案,并开发出与其配套、行之有效的带有校准孔的热电偶及便携式在线校准仪。为了提高测温系统的准确度,建议采用在线原位校准,方便易行,现已在国内推广应用。
[Abstract]:Based on the precise production of powder metallurgy industry and the strategy of high quality and high efficiency, the characteristics, classification and application of tungsten rhenium thermocouple used in powder metallurgy industry are briefly described. A new type of sensor, such as ultra-high vacuum (10 ~ 5 Pa), ultra-high pressure (15 MPa) thermocouple for powder metallurgy vacuum furnace and furnace temperature homogeneity test, is described in detail. The factors influencing the accuracy of temperature measurement in vacuum furnace are discussed in detail, such as vacuum, emissivity, thermal conductivity, thermal response time, insertion depth of thermocouple, selection of thermocouple protection tube, etc. This paper introduces the research on the localization of special thermocouple for imported vacuum furnace, the comparison of the performance of temperature sensor at home and abroad and the successful achievements of replacing the imported thermocouple of vacuum furnace. At present, the method of discrete element is used in the verification of temperature measurement system, that is, the components and instruments that constitute the temperature measurement system are verified separately. This method of verification is offline. In this paper, the disadvantages of off-line calibration method and the characteristics and requirements of system accuracy calibration in American Aerospace Standard (AMS 2750E) are briefly described. The latest concept of on-line in-situ calibration and the best system accuracy calibration scheme are discussed in detail, and an effective thermocouple with calibration hole and a portable on-line calibrator are developed. In order to improve the accuracy of the temperature measurement system, it is suggested that on-line in situ calibration be adopted, which is convenient and easy to carry out, and has been popularized and applied in China.
【作者单位】：沈阳东大传感技术有限公司;湘潭新大粉末冶金设备制造有限公司;
【分类号】：TH811

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