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10 条记录 (耗时 0.012 秒)

    Hydraulic circuit breaker
    5.
    发明授权
    Hydraulic circuit breaker 失效
    液压电路断路器

    公开(公告)号：US3587393A

    公开(公告)日：1971-06-28

    申请号：US3587393D

    申请日：1969-12-29

    申请人： BENDIX CORP

    发明人： VICK RALPH L

    IPC分类号： F15B20/00 ,  F15B11/08 ,  F15B13/042

    CPC分类号： F15B20/005 ,  Y10T137/2544

    摘要： A CIRCUIT BREAKER DEVICE IS DISCLOSED WHICH IS INTERPOSED BETWEEN A SOURCE OF FLUID UNDER PRESSURE AND A UTILIZATION DEVICE SUCH AS AN ACTUATOR. A PISTON-TYPE SHUTOFF VALVE IS INCLUDED WHICH IS SPRING BIASED TOWARD ITS OPEN POSITION. A PAIR OF FIXED ORIFICES MEASURE THE FLOW TOWARD THE UTILIZATION DEVICE AND FROM THE UTILIZATION DEVICE TO THE RETURN SIDE OF THE FLUID PRESSURE SOURCE. THE PRESSURE DROP ACROSS THESE ORIFICES IS CONTROLLED BY MEANS OF A SLIDE VALVE BIASED IN ONE DIRECTION WITH A LIGHT SPRING. SHOULD A GREATER THAN NORMAL FLOW APPEAR DOWNSTREAM OF THE CIRCUIT BREAKER IN THE CONDUIT TO THE UTILIZATION DEVICE OR A SIGNIFICANTLY REDUCED FLOW IN THE RETURN LINE, THIS WILL BE REFLECTED IN A LOWERED PRESSURE ON ONE SIDE OF THE SHUTOFF VALVE, AND IT WILL BEGIN TO MOVE IN A CLOSING DIRECTION. DAMPING ORIFICES ARE CONNECTED TO LIMIT THE VELOCITY OF MOVEMENT OF THE SHUTOFF VALVE TO AVOID PREMATURE CLOSING DUE TO TRANSIENT CONDITIONS. WHEN THE UTILIZATION DEVICE DEMANDS A GREATER FLOW THAN REQUIRED FOR STEADY STATE OPERATION, A MOMENTARY INCREASED PRESSURE DROP APPEARS ACROSS THE SLIDE VALVE, OPENING SUBSTANTIAL ORIFICES IN PARALLEL WITH THE FIXED ORIFICES AND PERMITTING GREATER FLOW THROUGH THE CIRCUIT BREAKER SO THAT THE PRESSURE DROP REMAINS SUBSTANTIALLY CONSTANT WHILE THE REQUIRED INCREASED FLOW IS PROVIDED. THIS ALSO PERMITS FASTER MOVEMENT OF THE SHUTOFF VALVE IN CASE OF A LEAK TO AVOID EXCESSIVE LOSS OF FLUID.

    Hydraulic system circuit breaker
    7.
    发明授权
    Hydraulic system circuit breaker 失效
    液压系统断路器

    公开(公告)号：US3568705A

    公开(公告)日：1971-03-09

    申请号：US3568705D

    申请日：1969-08-19

    申请人： BENDIX CORP

    发明人： BOYADJIEFF GEORGE I ,  AUSDAL ROBERT K VAN ,  VICK RALPH L

    IPC分类号： F16K17/34 ,  F15B20/00 ,  F16K17/22

    CPC分类号： F15B20/005 ,  Y10T137/2705 ,  Y10T137/7727

    摘要： A hydraulic circuit breaker or fail-safe device is disclosed for sensing leaks in lines to and from hydraulic actuators or the like. Flow through the line is sensed across a restriction on a piston valve member movable to close the line, the size of the restriction being such that flow in excess of normal requirements causes a significantly increased pressure drop, which drop is sensed across a quantity measuring piston movable in a chamber within the piston-valve, and causing the latter piston to move within its chamber at a rate controlled by the area of a control orifice. As this latter piston moves, it carries a shaft which is spring biased to resist movement until the pressure drop across the restriction reaches a value indicative of a leak. Two spool valve members are carried on the shaft whose function in the two embodiments shown is to direct either supply pressure or lower pressure against operating areas of the piston-valve to control its movement to open or close the line. A check valve is placed in a return line and an additional piston in contact with the biasing spring senses a leak in the return line as indicated by a changed pressure drop across the check valve and moves to either remove the effective spring bias on the shaft or to move the shaft directly such that the spool valve members direct flow to cause the piston-valve to close the line.