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    • 10. 发明授权
    • Equipment for measuring gas flow rate
    • 气体流量测量设备
    • US07467546B2
    • 2008-12-23
    • US11336936
    • 2006-01-23
    • Shinya IgarashiHiroshi KikawaYasuhiro AsanoNaoki Saito
    • Shinya IgarashiHiroshi KikawaYasuhiro AsanoNaoki Saito
    • G01F1/68
    • G01F1/6842
    • In a flow sensor, detecting elements are provided at a sub-passage. A sub-passage wall contains a hole to drain accumulated liquid. A protrusion arranged close to the hole on an external surface generates dynamic pressure on the opening in response to external flow. Alternatively, a protrusion upstream from the hole on the inner wall surface produces a separation flow area for separating the flow from the internal surface near the hole, whereby pressure in the separation area is reduced and almost the same pressure differences on the internal and external surfaces openings result. This reduces leakage from the hole and changes in the distribution flow in the sub-passage between cases where the hole is blocked and not blocked, thus minimizing flow measurement errors. Structure may be provided close to the external surface hole opening to prevent a liquid film or drop from being formed on the opening by surface tension.
    • 在流量传感器中,检测元件设置在子通道处。 子通道壁包含一个排出积聚液体的孔。 靠近外表面上的孔布置的突起响应于外部流动而在开口上产生动态压力。 或者,在内壁表面上的孔的上游突出产生分离流动区域,用于从孔附近的内表面分离流动,从而分离区域中的压力降低,并且在内表面和外表面上几乎相同的压力差 开场结果。 这样可以减少孔中的泄漏,并且在孔被阻塞并且不被堵塞的情况下,子通道中的分配流量的变化,从而最小化流量测量误差。 结构可以设置在靠近外表面孔开口处,以防止通过表面张力在开口处形成液体膜或液滴。