公开(公告)号：US4104008A

公开(公告)日：1978-08-01

申请号：US805077

申请日：1977-06-09

申请人： Ernst Hoffmann ,  Siegfried Reimann ,  Heinz Aschermann

发明人： Ernst Hoffmann ,  Siegfried Reimann ,  Heinz Aschermann

IPC分类号： F01L25/06 ,  F04B9/127 ,  F04B9/133 ,  F04B53/16 ,  F04B17/00 ,  F04B35/00

CPC分类号： F04B9/133 ,  F01L25/063 ,  F04B53/162 ,  F04B9/127

摘要： A fluid-actuated, such as a pneumatically actuated, hydraulic pump of either the single acting or the double acting type is controlled in its operation by a main valve member which has two connecting compartments the fluid in one of which is always at the atmospheric, and in the other always at a superatmospheric, pressure. The main valve member has two end faces, one larger than the other, the smaller being always acted upon by the superatmospheric pressure of the fluid and the larger one intermittently. An auxiliary valve member controls the admission of the pressurized fluid to the larger end face and is open only during the reversal of the hydraulic pump from suction to pumping stroke, while the pressure acting on the larger end face is relieved during reversal from the pumping to the suction stroke. A duct communicates one or the other of the connecting compartments of the main valve member which an actuating compartment of an actuating unit, depending on the position of the main valve member. In a single acting pump, the pressure relief of the larger end face is accomplished by a guiding element reciprocating with the hydraulic pump and permitting pressure relief only during reversal from the pumping to the suction stroke. In a double acting pump, an additional auxiliary valve member controls the pressure relief during such reversal. In the double acting pump, a channel communicates the other actuating compartment either with the one connecting compartment or with a control compartment delimited by the smaller end face of the main valve member.

摘要翻译： 单作用或双作用型的液压致动的液压泵在其操作中通过主阀构件进行控制，该主阀构件具有两个连接隔室，其中一个的流体总是处于大气压， 而在另一个总是处于超大气压的压力下。 主阀构件具有两个端面，一个大于另一个，较小的端面总是受到流体的超大气压力的作用，间歇地较大的一个。 辅助阀构件控制加压流体进入较大端面，并且仅在液压泵从抽吸到泵送冲程的反向期间打开，而作用在较大端面上的压力在从泵送到泵 吸入冲程。 根据主阀构件的位置，管道将主阀构件的连接隔室中的一个或另一个连通到致动单元的致动室。 在单作用泵中，较大端面的压力释放通过与液压泵往复运动的引导元件来实现，并且仅在从泵送到吸入冲程的反转期间才允许压力释放。 在双作用泵中，附加的辅助阀构件在这种反转期间控制压力释放。 在双作用泵中，一个通道与另一个驱动室连通，一个连接隔间或由主阀构件的较小端面限定的控制室。