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    • 5. 发明申请
    • LOW ENERGY FLUID ACTUATOR CONTROL ELEMENT
    • 低能量流体致动器控制元件
    • US20050199839A1
    • 2005-09-15
    • US10797519
    • 2004-03-10
    • Raymond Vincentrandall schmitt
    • Raymond Vincentrandall schmitt
    • F16K31/12
    • F16K31/42
    • A pilot valve is disclosed. In one embodiment, it comprises: an input passageway, an output passageway, a rotatable shaft disposed between them, a permanent magnet affixed to the rotatable shaft, an electromagnet, a control element, and a failsafe magnet. The rotatable shaft has a slot that gives the rotatable shaft a varied cross-section as a function of its position. The slot is disposed to permit fluid to flow between the input passageway and the output passageway except when the rotatable shaft is in a closed position. The electromagnet is disposed to generate first magnetic field that, via the permanent magnet, drives the rotatable shaft away from the closed position. The control element places a PWM current on the electromagnet, such that the length of the duty cycle controls the strength of the first magnetic field. The failsafe magnet is disposed to generate a second magnetic field that drives the rotatable shaft away from the closed position.
    • 公开了一种先导阀。 在一个实施例中,它包括:输入通道,输出通道,设置在它们之间的可旋转轴,固定到可旋转轴的永磁体,电磁体,控制元件和故障保护磁体。 可旋转轴具有槽,其使可旋转轴作为其位置的函数的变化的横截面。 槽被设置成允许流体在输入通道和输出通道之间流动,除了当可旋转轴处于关闭位置时。 电磁体设置成产生第一磁场,其经由永磁体驱动旋转轴远离关闭位置。 控制元件将PWM电流放置在电磁体上,使得占空比的长度控制第一磁场的强度。 故障安全磁铁设置成产生驱动旋转轴远离关闭位置的第二磁场。