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    • 8. 发明授权
    • Electromagnetic flowmeter
    • 电磁流量计
    • US5307687A
    • 1994-05-03
    • US890245
    • 1992-05-29
    • Masatsugu AraiAkiomi KohnoKazuaki YokoiYuuji YoshitomiYutaka SakuraiTamio Ishihara
    • Masatsugu AraiAkiomi KohnoKazuaki YokoiYuuji YoshitomiYutaka SakuraiTamio Ishihara
    • G01F1/58
    • G01F1/584G01F1/58
    • An electromagnetic flowmeter for measuring the flow rate of a fluid. The flowmeter has a measuring tube made of ceramics and defining a fluid passage therein for the fluid, electrodes having ends exposed to an interior of the measuring tube through holes which are formed in a wall of the measuring tube, a magnetic field generating device disposed around the electrodes, and a case encasing the measuring tube, the electrodes and the magnetic field generating means. A ratio t/R between a wall thickness t and a mean radius R of the measuring tube is determined such that stress generated in the measuring tube by the fluid in the measuring tube does not exceed the rupture stress of the measuring tube. The measuring tube can have flanges on both axial ends thereof, a radial height of the flange from an outer surface of the measuring tube is not greater than the wall thickness of the tube when the tube is made of Al.sub.2 O.sub.3 and not greater than a value three times as large as the tube wall thickness when the tube is made of Si.sub.3 N.sub.4. The electrodes may be made from Ni or an Ni alloy and are secured to the measuring tube by press-fitting into holes formed in the tube wall or by jointing. The electromagnetic flowmeter thus obtained exhibits high strength and reliability and high degree of gas-tightness in the tube portions around the electrodes.
    • 一种用于测量流体流量的电磁流量计。 流量计具有由陶瓷制成的测量管,用于流体的流体通道,具有暴露于测量管内部的端部的电极,通孔形成在测量管的壁中,磁场产生装置设置在 电极和封装测量管的壳体,电极和磁场产生装置。 确定测量管的壁厚t和平均半径R之间的比率t / R,使得由测量管中的流体在测量管中产生的应力不超过测量管的破裂应力。 测量管在其两个轴向端都可以具有凸缘,当管由Al2O3制成并且不大于三值时,法兰从测量管的外表面的径向高度不大于管的壁厚 当管由Si 3 N 4制成时,管壁厚度的倍数。 电极可以由Ni或Ni合金制成,并通过压配合到形成在管壁中的孔或通过接合而固定到测量管。 由此获得的电磁流量计在电极周围的管部显示出高的强度和可靠性以及高气密性。