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    • 35. 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。
    • 38. 发明授权
    • Thermal type gas flow measuring instrument
    • 热式气体流量计
    • US07213455B2
    • 2007-05-08
    • US11012290
    • 2004-12-16
    • Chihiro KobayashiShinya Igarashi
    • Chihiro KobayashiShinya Igarashi
    • G01F1/68
    • G01F1/6983F02D41/187G01F1/6965
    • A thermal type gas flow measuring instrument measures gas flow with high precision by accurately correcting changes in radiation heat characteristics of a heating resistor due to contamination. The instrument comprises a second heating resistor 30 whose resistance value, which changes if contaminated, is calculated by measuring the terminal voltage thereof by calculating means 32, and the calculated value is compared with a temperature detected by a temperature detecting element 31. Based on the result of comparison, the level of contamination of the second heating resistor 30 is determined. The second heating resistor 30 and the first heating resistor 3 are disposed in similar environments such that their levels of contamination can be considered equal. Based on the level of contamination calculated from the result of comparison, a correction value is calculated and the output of the first heating resistor 3 is corrected in accordance with the correction value.
    • 热式气体流量测量仪器通过精确地校正由于污染导致的加热电阻器的辐射热特性的变化,高精度地测量气体流量。 仪器包括第二加热电阻器30,其通过计算装置32测量其端电压来计算其污染时的电阻值,并将该计算值与由温度检测元件31检测到的温度进行比较。基于 比较结果确定了第二加热电阻器30的污染程度。 第二加热电阻器30和第一加热电阻器3设置在类似的环境中,使得它们的污染程度可以被认为是相等的。 根据比较结果计算出的污染程度,计算校正值,根据校正值校正第一加热电阻体3的输出。