公开(公告)号：US4663966A

公开(公告)日：1987-05-12

申请号：US842245

申请日：1986-03-21

申请人： Martin J. Fisher ,  Roger A. Heron ,  Martin L. Hughes

发明人： Martin J. Fisher ,  Roger A. Heron ,  Martin L. Hughes

IPC分类号： G01N15/06

CPC分类号： G01N15/06

摘要： Apparatus and method for determining the level of particulate contamination within the fluid of a hydraulic system. System fluid is introduced through a non-return valve into a space where it is contained by a piston. The structure of the piston includes relatively-movable parts defining a restricted orifice to which fluid, having passed through a drilling in the piston, may escape to drain. When the piston is moved so as to tend to reduce the trapped volume, fluid is expelled from the volume through the drilling and clearance until the clearance becomes blocked by contaminants. The degree of contamination may then be derived from the distance that the piston has moved. The separate parts of piston structure are then relatively-moved to clear the orifice and allow the rest of the trapped fluid to escape, after which the orifice is reset and another volume of fluid introduced to be tested. The piston may be driven by reaction with the system fluid, or alternatively by means independent of that fluid. The specification describes alternative means for measuring the distance travelled by the piston, alternative piston structures to define the orifice, and alternative arrangements of the device as a whole relative to the hydraulic system as a whole.

公开(公告)号：US4599893A

公开(公告)日：1986-07-15

申请号：US598435

申请日：1984-04-09

申请人： Martin J. Fisher ,  Roger A. Heron ,  Martin L. Hughes

发明人： Martin J. Fisher ,  Roger A. Heron ,  Martin L. Hughes

IPC分类号： G01N15/06

CPC分类号： G01N15/06

摘要： Apparatus and method for determining the level of particulate contamination within the fluid of a hydraulic system. System fluid is introduced through a non-return valve into a space where it is contained by a piston. The structure of the piston includes relatively-movable parts defining a restricted orifice to which fluid, having passed through a drilling in the piston, may escape to drain. When the piston is moved so as to tend to reduce the trapped volume, fluid is expelled from the volume through the drilling and clearance until the clearance becomes blocked by contaminants. The degree of contamination may then be derived from the distance that the piston has moved. The separate parts of piston structure are then relatively-moved to clear the orifice and allow the rest of the trapped fluid to escape, after which the orifice is reset and another volume of fluid introduced to be tested. The piston may be driven by reaction with the system fluid, or alternatively by means independent of that fluid. The specification describes alternative means for measuring the distance travelled by the piston, alternative piston structures to define the orifice, and alternative arrangements of the device as a whole relative to the hydraulic system as a whole.

摘要翻译： 用于确定液压系统流体内的颗粒污染水平的装置和方法。 系统流体通过止回阀引入到由活塞容纳的空间中。 活塞的结构包括限定孔的可相对移动的部件，已经穿过活塞中的钻孔的流体可以向该流体排出。 当活塞移动以倾向于减小被捕获的体积时，流体通过钻孔和间隙从体积排出，直到间隙被污染物阻塞。 然后可以从活塞移动的距离导出污染程度。 然后活塞结构的单独部分被相对移动以清除孔口并允许其余的被捕获的流体逸出，之后孔口被复位，并且另一体积的流体被引入待测试。 活塞可以通过与系统流体的反应来驱动，或者通过独立于该流体的方式来驱动。 该说明书描述了用于测量由活塞行进的距离，用于限定孔口的替代活塞结构以及作为整体相对于液压系统的整体装置的替代布置的替代方式。

公开(公告)号：US4495799A

公开(公告)日：1985-01-29

申请号：US446619

申请日：1982-12-03

申请人： Martin J. Fisher ,  Roger A. Heron ,  Martin L. Hughes

发明人： Martin J. Fisher ,  Roger A. Heron ,  Martin L. Hughes

IPC分类号： G01N7/00 ,  B01D35/143 ,  B01D35/147 ,  F15B21/04 ,  F17D3/16 ,  G01N15/06

CPC分类号： G01N15/06 ,  B01D35/143 ,  F15B21/041

摘要： A device for determining the level of particulate contamination in a hydraulic system. Between the inlet and outlet of the device the fluid passes through the narrow clearance between a piston and a surrounding bore. As the clearance becomes obstructed by contaminant, pressure rises in a chamber upstream of the piston. Rise of this pressure above a certain level is detected by a detector which both triggers a counter and operates a solenoid to withdraw the piston and release trapped contaminant, after which the piston returns and another cycle of contaminant build-up begins. The frequency of the release of the piston indicates the degree of contamination of the fluid. Instead of pressure build-up, parameters related to fluid flow may be used to trigger the counter and the release of contaminants from clearance, and means may be provided to meter individual, fixed-volume charges from the general body of fluid and discharge them through a clearance. The clearance may as an alternative be arranged to be cleared by back flushing.

摘要翻译： 一种用于确定液压系统中颗粒物污染水平的装置。 在装置的入口和出口之间，流体通过活塞和周围孔之间的窄间隙。 当间隙被污染物阻塞时，压力在活塞上游的腔室中升高。 超过一定水平的这种压力的升高由检测器检测到，其检测器触发计数器并且操作螺线管以抽出活塞并释放被捕获的污染物，之后活塞返回并且另外的污染物累积循环开始。 活塞释放的频率表示流体的污染程度。 代替压力积聚，与流体流动相关的参数可用于触发计数器和污染物从间隙的释放，并且可以提供装置以从流体的一般体积计量单个固定体积的电荷并将其排出 清仓 可以通过反冲洗来清除间隙。

公开(公告)号：US4836498A

公开(公告)日：1989-06-06

申请号：US193178

申请日：1988-05-09

申请人： Roger A. Heron ,  Martin L. Hughes ,  Ian Hansford

发明人： Roger A. Heron ,  Martin L. Hughes ,  Ian Hansford

IPC分类号： F16K47/02 ,  F16K11/07 ,  F16K47/04

CPC分类号： F16K11/0708 ,  F16K47/04

摘要： Liquid flow through a passage (9) in a body member (7) is controlled by a relatively movable poppet valve member (8). A frusto-conical first guide surface (11) on the poppet valve (8) merges smoothly with a second guide surface (12 and 13) which, in cross-section, has part-circulr portion (12) and an outlet end (13). Liquid passing through an aperture (10) between the body member (7) and the poppet valve member (8) flows along the first guide surface (11) and the second guide surface (12 and 13) and adopts a toroidal vortex flow pattern and this controls the collapse of those bubbles which form as a result of cavitation so as to diminish audible and inaudible vibrations.

摘要翻译： 通过主体构件（7）中的通道（9）的液体流动由相对可动的提升阀构件（8）控制。 提升阀（8）上的截头圆锥形的第一引导表面（11）与第二引导表面（12和13）平滑地合并，第二引导表面（12和13）的横截面具有部分环形部分（12）和出口端（13） ）。 通过主体构件（7）和提升阀构件（8）之间的孔（10）的液体沿着第一引导表面（11）和第二引导表面（12和13）流动，并采用环形涡流模式， 这可以控制由于气穴而形成的那些气泡的崩溃，从而减少可闻和听不见的振动。