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    Flow rate detector mechanism with variable venturi and exhaust gas sampling method using the same
    4.
    发明授权
    Flow rate detector mechanism with variable venturi and exhaust gas sampling method using the same 失效
    流量检测器机构采用可变文丘里管和排气采样方法

    公开(公告)号：US06405577B2

    公开(公告)日：2002-06-18

    申请号：US09835353

    申请日：2001-04-17

    申请人： Noriyuki Hanashiro ,  Atsushi Shibata ,  Shigeru Yanagihara ,  Shuta Yamawaki

    发明人： Noriyuki Hanashiro ,  Atsushi Shibata ,  Shigeru Yanagihara ,  Shuta Yamawaki

    IPC分类号： G01L122

    CPC分类号： G01N33/0016 ,  G01F1/44 ,  G01F7/005

    摘要： A flow rate detector mechanism using variable Venturi therein, comprising: a variable flow rate generator, comprising: a core 11; and a variable Venturi 12; wherein a throat (flow passage) cross-sectional area defined between the core and the venturi is able to be changed by shifting relative positions of the core and the venturi in a direction of axes thereof, and further comprising a flow rate calculation processing portion 30 for calculating a flow rate based on the relative positions in the direction of the axes thereof and for outputting the calculated flow rate, thereby continuously changing the constant flow rate, without occurrence of any disturbance therein. Further, with an exhaust gas sampling method applying the flow rate detector mechanism using variable Venturi, CVS flow rate is changed within the range of the phases of measure modes, so as to make small the difference between the peak dew point in the bag and the final dew point in the bag, as well as to causethe final dew point to approach the temperature at which the bag is kept. Therefore, the dilution ratio of the final dew point is decreased, so as to improve the accuracy in analysis.

    摘要翻译： 一种在其中使用可变文丘里管的流量检测器机构，包括：可变流量发生器，包括：芯11; 和可变文丘里12; 其特征在于，在所述芯体和文氏管之间形成的喉部（流路）截面积能够通过沿其轴方向移动所述芯体和文氏管的相对位置而变化，还包括流量计算处理部30 用于计算基于其轴方向上的相对位置的流量并输出所计算的流量，从而连续地改变恒定流量，而不发生任何干扰。 此外，利用使用可变文丘里管的流量检测器机构的排气采样方法，CVS流量在测量模式的相位的范围内变化，从而使袋中的峰值露点与 袋中的最终露点，以及最终露点接近保持袋的温度。 因此，最终露点的稀释比降低，从而提高分析精度。