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    • 2. 发明公开
    • DETECTING END OF STROKE IN A HYDRAULIC MOTOR
    • BESTIMMUNG DES在EINEM HYDRAULIKMOTOR中脱颖而出
    • EP3071843A4
    • 2017-07-05
    • EP14863219
    • 2014-11-05
    • WESTPORT POWER INC
    • BATENBURG GREGORY ABENGALI ANUJA S
    • F15B15/28F04B9/105
    • F15B15/2815F01B31/26F04B9/105F04B49/065F04B51/00F04B2015/081F15B15/2838F15B2211/6309F15B2211/6653F15B2211/8616
    • It is challenging to detect end of stroke for hydraulically actuated, reciprocating piston pumps for a variety of reasons. When the pump pressurizes a process fluid to a 10 relatively low pressure the magnitude of hydraulic fluid pressure is not as distinct compared to the magnitude of a pressure drop across a shuttle valve employed to detect end of stroke, which makes detecting the end of stroke event difficult. A method is disclosed for detecting end of a piston stroke in a hydraulic motor comprising a reciprocating piston with a shuttle valve. The method comprises 1 detecting end of piston stroke when a magnitude of a rate of change of hydraulic fluid pressure is substantially greater than a magnitude of a mean rate of change of hydraulic fluid pressure over said piston stroke; and noise in a hydraulic fluid pressure signal is substantially negligible.
    • 出于各种原因检测液压驱动的往复式活塞泵的行程终点是具有挑战性的。 当泵将过程流体加压到相对较低的压力时,液压流体压力的大小与穿过用于检测行程终点的梭阀的压降幅度相比不明显,这使得检测到行程终点事件 难。 公开了一种用于检测包括具有往复阀的往复式活塞的液压马达中的活塞行程的结束的方法。 所述方法包括:1,当液压流体压力的变化率的幅值明显大于所述活塞行程上液压流体压力的平均变化率的幅值时,检测活塞行程的终点; 并且液压流体压力信号中的噪声基本可以忽略。
    • 4. 发明公开
    • VANNE
    • EP2640981A1
    • 2013-09-25
    • EP11796736.4
    • 2011-11-08
    • Snecma
    • GIANNOTTA, Salvatore
    • F15B15/28
    • F16K17/02F15B15/2838F16K31/1221F16K37/0066Y10T137/0396Y10T137/7793
    • The invention relates to a valve (56), notably for controlling a clearance at the tip of turbine blades, comprising a piston (60) and means for supplying fluid under pressure to cause the piston (60) to move inside a hollow body (58), and means for detecting the position of the piston (60), comprising a shut-off element (80) which moves as one with the piston (60) and is mounted such that it can move in a fluid passage between two positions, open and closed respectively, the fluid passage connecting the supply means to a pressure sensor (94) that generates an output signal representative of the position of the piston of the valve.
    • 本发明涉及一种阀(56),特别是用于控制涡轮叶片尖端处的间隙的阀(56),其包括活塞(60)和用于供给处于压力下的流体以使活塞(60)在空心体(58)内移动的装置 )和用于检测活塞(60)的位置的装置,该装置包括一个与活塞(60)一体移动并安装成使得它可以在两个位置之间的流体通道中移动的关闭元件(80) 分别打开和关闭,流体通道将供应装置连接到产生代表阀门活塞位置的输出信号的压力传感器(94)。