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用机械式求积仪来积算仪表记录数值,目前各单位还应用得比较广泛。随着仪表类型的不断增多,就需要各种不同规格的求积仪,以相适应。一般热工用求积仪可分两种:一种是积算等分刻度记录纸用的线性求积仪;一种是积算不等分流量刻度记录纸用的所谓均方根求积仪。目前国内使用的仪表,通常分长图型和园图型两类,它们的求积仪结构也不一样。综合起来,热工中常用的有四种求积仪:
The use of mechanical plotter to calculate the value of instrument records, the current units are also applied more widely. With the increasing types of instruments, you need a variety of different specifications of plotter, to adapt. General thermometer with a totalizer can be divided into two kinds: one is the cumulative scale recording paper used for linear prescaling instrument; one is not equal to the cumulative flow scale recording paper used for so-called root mean square sigma . At present, the instruments used in China are usually divided into two types: long-plot type and park-type type, and the structures of them are also different. Taken together, there are four types of quadrature instruments commonly used in thermal engineering: