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。

公开(公告)号：US20060279083A1

公开(公告)日：2006-12-14

申请号：US11131924

申请日：2005-05-18

申请人： Arnaud Allais ,  Ernst Hoffmann

发明人： Arnaud Allais ,  Ernst Hoffmann

IPC分类号： F16L49/00

CPC分类号： F16L23/16 ,  F16L47/14 ,  Y10S285/904

摘要： Arrangement for connecting a fiber-reinforced plastic pipe (18) to a stainless steel flange (12, 16), in which the end of the fiber-reinforced plastic pipe (18) is accommodated in a ring-shaped groove (12a, 16a) in the flange (12, 16), the groove conforming to the dimensions of the fiber-reinforced plastic pipe (18), where the gap remaining between the end of the fiber-reinforced plastic pipe (18) and the ring-shaped groove (12a, 16a) is filled with a sealant (19).

摘要翻译： 将纤维增强塑料管（18）连接到不锈钢法兰（12,16）的布置，其中纤维增强塑料管（18）的端部容纳在环形槽（12a，16） a）在法兰（12,16）中，符合纤维增强塑料管（18）尺寸的槽，其中纤维增强塑料管（18）的端部与环形 槽（12a，16a）填充有密封剂（19）。

公开(公告)号：US20050274697A1

公开(公告)日：2005-12-15

申请号：US11127801

申请日：2005-05-12

申请人： Christian Frohne ,  Ernst Hoffmann ,  Rainer Brunn

发明人： Christian Frohne ,  Ernst Hoffmann ,  Rainer Brunn

IPC分类号： B23K9/167 ,  B21C37/08 ,  B23K9/00 ,  B23K9/025 ,  B23K9/16 ,  B23K101/06 ,  F16L9/17

CPC分类号： B23K9/0253 ,  B23K2101/06

摘要： A process for the continuous production of longitudinally welded metal tubes where a metal strip (1) is drawn from a strip supply and gradually shaped into a slit tube in a shaping station (2). The slit tube is welded in a welding system (4) along the edges of the strip, and the welded tube (6) is extracted by an extraction device (5). The welding system (4) is a protective gas arc welding system with several electrodes supplied by separate sources (4c, 4d) of welding current. The electrodes are arranged in succession, in the direction of production. The welding system (4) has two welding devices (4a, 4b), whose electrode tips are directed at a common welding point. Only one of the welding devices (4a, 4b) is in operation at any given time, while the other welding device is in a standby position. When an electrode change becomes necessary, the arc of the welding device in the standby position is first struck by means of an auxiliary arc. The welding current intensity of the welding device presently in operation is then reduced, while the welding current intensity of the welding device in the standby position is simultaneously increased.

摘要翻译： 一种用于连续生产纵向焊接的金属管的方法，其中金属条（1）从条带供应拉出并逐渐成形为成形台（2）中的狭缝管。 狭缝管沿着条的边缘焊接在焊接系统（4）中，并且焊管（6）由提取装置（5）提取。 焊接系统（4）是一种保护性气体电弧焊接系统，其中多个电极由焊接电流的独立源（4c，4d）提供。 电极沿生产方向相继排列。 焊接系统（4）具有两个焊接装置（4a，4b），其电极头指向公共焊接点。 焊接装置（4a，4b）中只有一个在任何给定的时间运行，而另一个焊接装置处于待机位置。 当需要电极改变时，待机位置的焊接装置的电弧首先用辅助电弧冲击。 焊接装置的焊接电流强度随后被降低，而待机位置的焊接装置的焊接电流强度同时增加。

公开(公告)号：US06550300B2

公开(公告)日：2003-04-22

申请号：US09930309

申请日：2001-08-16

申请人： Ernst Hoffmann ,  Klaus-D. Jank ,  Michael Meyer ,  Robert Strohmeyer ,  Friedrich Harten

发明人： Ernst Hoffmann ,  Klaus-D. Jank ,  Michael Meyer ,  Robert Strohmeyer ,  Friedrich Harten

IPC分类号： B21D300

CPC分类号： B21D15/06 ,  B21C37/205

摘要： An apparatus for producing annularly corrugated metal tubes, particularly the outer conductor of coaxial high-frequency cables, using at least one pressure roller revolving around a plain tube. The corrugations are formed in the plain tube by the teeth of the pressure roller, which is rotatable about an axis at a 90° angle to the longitudinal axis of the tube, and the axis of rotation of the pressure roller, itself in a plane perpendicular to the longitudinal axis of the tube, revolves around the plain tube being fed to the pressure roller as the corrugations are produced. The plain tube in turn rotates the pressure roller by its feed. The tips of the teeth are substantially flat, the tube is tightly guided in a guide bushing (12) in front of and behind the engagement with the pressure roller (13), and the number of teeth (Z) ranges between 7 and 11, preferably between 8 and 10.