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    • 4. 发明专利
    • TURBINE-TYPE FLOWMETER
    • JPH01285822A
    • 1989-11-16
    • JP11484588
    • 1988-05-13
    • TOKICO LTDTOKYO GAS CO LTDOSAKA GAS CO LTDTOHO GAS KK
    • AMEMORI ATSUHIROSAWAMOTO KOJIKOJIMA TERUHISAKOMAKI MASAYUKIMORITA HIROSHIMURAKAMI TAKATOSHISATO YASUOKOKETSU YASUO
    • G01F1/10
    • PURPOSE:To prevent an extraneous substance from sticking to a rotating shaft and a bearing of a turbine wheel, by a construction wherein, even when the extraneous substance in a fluid to be measured intrudes between a cone member on the upstream side and the turbine wheel, the extraneous substance is made to stay and be deposited by a projection element projecting into an annular recessed part of a rotor hub. CONSTITUTION:A turbine wheel 3 rotating with a rotating shaft 6 in accordance with the flow rate of a fluid to be measured, bearings 9 and 10 bearing the rotating shaft 6 pivotally, cone members 11 and 16 provided on the upstream and downstream sides of the turbine wheel 3, and a hub 4 of the wheel 3 opposite to the member 11, are provided. In addition, an annular recessed part 4b formed around the rotating shaft 6, and a projection element 11b which projects from the member 11 into the recessed part 4b to be positioned in proximity to the part 4b with a minute gap from the inner wall of this part so that the fluid flowing into th recessed part 4b be made to stay around the rotating shaft 6, are provided. An extraneous substance is made to stay by said projection element 11b and to be deposited on this element 11b, and thereby the extraneous substance can be prevented from sticking onto the rotating shaft 6 and the bearing 9 and 10.