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    • 3. 发明专利
    • Check valve, infusion device using the same, and method of manufacturing check valve
    • 检查阀,使用其的输液装置和制造检查阀的方法
    • JP2009103554A
    • 2009-05-14
    • JP2007274917
    • 2007-10-23
    • Shimadzu Corp株式会社島津製作所
    • ASO YOSHIAKI
    • G01N30/32B01L99/00F16K15/04
    • F16K15/04B01L3/567F16K25/00Y10T29/49409Y10T137/791
    • PROBLEM TO BE SOLVED: To provide a check valve improving the tightness between a sphere and a valve seat, and suppressing its sinking, and also to provide a liquid chromatography infusion pump enabling a high precision infusion even in a low flow rate region. SOLUTION: On a surface contacting with the sphere on the valve seat 10 of the check valve, a rim 10r is disposed around a through-hole 10h in the center of the valve seat 10. The rim 10r is formed as a boundary between a concave spherical surface of a diameter Φ1 and a concave spherical surface of a diameter Φ2 disposed as concentric circles with the through-hole 10h. When the sphere of a diameter ΦB abuts on the valve seat 10, the sphere 15 abuts on the valve seat 10 at the annular rim 10r in a line contact according to a relation of Φ1>ΦB>Φ2, thereby appropriately reducing its contact area and suppressing the sinking. COPYRIGHT: (C)2009,JPO&INPIT
    • 要解决的问题:提供一种提高球体与阀座之间的紧密性并抑制其下沉的止回阀,并且还提供即使在低流量区域也能够进行高精度输注的液相色谱输注泵 。 解决方案:在与止回阀的阀座10上的球接触的表面上,在阀座10的中心的通孔10h周围设置有边缘10r。边缘10r形成为边界 在直径Φ1的凹形球面和直径Φ2的凹球面之间,与通孔10h同心圆设置。 当直径ΦB的球体与阀座10抵接时,根据Φ1>ΦB>Φ2的关系,球体15以环形边缘10r以线接触方式抵接在阀座10上,从而适当地减小其接触面积, 抑制下沉。 版权所有(C)2009,JPO&INPIT