一种可控恒压强条件下真空玻璃传热系数测量仪研制

根据国标JC／T1079—2008中规定的测量真空玻璃传热系数的方法，在实际研制过程中，发现仪器的冷、热板与真空玻璃表面之间的压强对其测量结果有较大影响．为此，研制出了一种可控恒压强条件下的真空玻璃传热系数测量仪．主要采用可编程三相SPWM芯片和单片机等主要电路器件组成可控恒压强系统，再利用步进电机等步距、高精度的特点，采用模糊PID控制实现了在限定的测量范围内不同压强条件的选择，并在此基础上完成整个传热系数的测量，实现了在指定的恒定压强下准确测量真空玻璃传热系数K值目标，同时也为真空玻璃传热系数的对比提供一个压强参数，有助于对真空玻璃隔热性能横向比较研究，在理论和实践上都具有十分重要的意义．

Developed an instrument for measuring the heat transfer coefficient of vacuum glass with controllable constant pressure conditions

The research method of measuring vacuum glasses heat transfer coefficient is usu- ally based on JC/T1079-2008. During this research method, it comes up some problems which the measurement result is affected by the pressure between the hot and cold plate. Based on the phenomenon,the paper designs a vacuum glass heat transfer coefficient-measur- ing instrument. This instrument is controllable and having constant pressure measuring con- dition. The instrument is composed by four parts, and they are programmable three-phase SPWM generation chip and MCU system. For the step motor having the advantages of the same step and high precision step distance, the instrument can achieve that choosing different pressure condition is available during a certain measuring range by using fuzzy PID. Based on those functions, the instrument can achieve measuring vacuum glassrs heat transfer coeffi- cient and getting the values of parameter K. At the same time, the instrument offers a pres- sure parameter which can provide a comparison during measuring the vacuum glass＇s heat transfer coefficient. This improvement can promote the research of the vacuum glass per-formance,and also has an important meaning both in theory and in practice.