Abstract:
A fluid-working machine has a plurality of working chambers, e.g., cylinders, of cyclically changing volume, a high-pressure fluid manifold and a low-pressure fluid manifold, at least one valve linking each working chamber to each manifold, and electronic sequencing means for operating said valves in timed relationship with the changing volume of each chamber, wherein the electronic sequencing means is arranged to operate the valves of each chamber in one of an idling mode, a partial mode in which only part of the usable volume of the chamber is used, and a full mode in which all of the usable volume of the chamber is used, and the electronic sequencing means is arranged to select the mode of each chamber on successive cycles so as to infinitely vary the time averaged effective flow rate of fluid through the machine.
Abstract:
The invention relates to an axial piston machine having a swashplate design, comprising a cylinder drum that is rotatably supported in a housing and that has a plurality of cylinder bores, which have pistons that can be slid longitudinally in said cylinder bores and that are supported on a swashplate. The aim of the invention is to achieve an improvement in the efficiency with a short length design by means of reducing the lost forces. The aim is achieved in that no force components act on the pistons in the radial direction.
Abstract:
A fluid-working machine has a plurality of working chambers, e.g. cylinders (11), of cyclically changing volume, a high-pressure fluid manifold (14) and a low-pressure fluid manifold (16), at least one valve (13, 15) linking each working chamber to each manifold, and electronic sequencing means (20) for operating said valves in timed relationship with the changing volume of each chamber (11), wherein the electronic sequencing means is arranged to operate the valves of each chamber in one of an idling mode, a partial mode in which only part of the usable volume of the chamber is used, and a full mode in which all of the usable volume of the chamber (11) is used, and the electronic sequencing means (20) is arranged to select the mode of each chamber on successive cycles so as to infinitely vary the time averaged effective flow rate of fluid through the machine.
Abstract:
Gezeigt wird eine Kältemittelverdichter mit einem hermetisch dichten Verdichtergehäuse, in dessen Innerem eine ein Kältemittel verdichtende Kolben-Zylinder-Einheit (21) angeordnet ist, deren Zylindergehäuse (1) stirnseitig mittels eines Zylinderkopfs (4) verschlossen ist, wobei die Kolben- Zylinder-Einheit (21) mindestens einen Kolben (3) aufweist und wobei ein Linearantrieb (6) vorgesehen ist, umfassend mindestens einen von einer Erregerwicklung (8) umgebenen Schwingkörper (7), welcher mit dem Kolben (3) verbunden ist, um diesen entlang einer Kolbenlängsachse (9) oszillierend zu bewegen. Dabei ist vorgesehen, dass die Kolben-ZyIinder- Einheit (21) mit mindestens einer Dauermagnetanordnung bestückt ist, umfassend jeweils mindestens einen am Kolben (3) ersten Dauermagneten (11) und mindestens einen am Zylindergehäuse (1) angeordneten zweiten Dauermagneten (12), wobei der erste Dauermagnet (11) und der zweite Dauermagnet (12) mit jeweils gleicher Magnetpolrichtung zueinander weisen, um zur Begrenzung des Kolbenwegs im Bereich des oberen Totpunkts und/oder im Bereich des unteren Totpunkts eine abstoßende Wirkung zwischen den beiden Dauermagneten (11, 12) zu erzeugen.
Abstract:
Die Erfindung betrifft eine Steuereinrichtung für eine hydraulische Kolbenmaschine. Deren zeitgemittelter Volumenstrom ist veränderbar. Die Kolbenmaschine besitzt eine Vielzahl von Kolben, die jeweils einen Arbeitsraum begrenzen, dessen Volumen sich mit dem Hub eines Kolbens verändert und der über ein erstes Ventil mit einem ersten Anschluss und über ein zweites Ventil mit einem zweiten Anschluss verbindbar ist. Wenigstens eines der beiden Ventile eines Arbeitsraums ist aktiv elektrisch betätigbar. Die Steuereinrichtung weist ein elektronisches Steuergerät auf, von dem die aktiv betätigbaren Ventile der Arbeitsräume in einem Leerhubmodus, in dem der Kolbenhub nicht genutzt wird, in einem Partialhubmodus, in dem nur ein Teil des Kolbenhubs genutzt wird, und in einem Vollhubmodus, in dem der volle Kolbenhub genutzt wird, betreibbar sind. Für einen Betrieb mit pulsationsarmen Volumenstrom ist vorgesehen, dass in einem ersten Volumenstrombereich alle Kolben im Partialhubmodus und in einem daran anschließenden, zweiten Volumenstrombereich eine verringerte Anzahl von Kolben im Partialhubmodus und die anderen Kolben im Leerhubmodus betrieben werden.
Abstract:
Pumping unit (10) for a machine to distribute concrete comprising: a pair of pistons (12, 13) provided with a relative pumping cylinder (22, 23) movable linearly for a determinate travel (S) to feed the concrete to a determinate circuit to distribute the concrete; and a hydraulic command circuit (11) operatively connected to both the pistons (12, 13), to determine an alternate pumping movement of the relative pumping cylinders (22, 23). The pumping unit (10) comprises at least a sensor member (15) operatively associated to at least one of the pistons (12, 13) in order to detect point-by -point one or more data relating to the operating condition of the pumping cylinder (22, 23) during its movement for the whole travel (S). The data comprise at least one of position, speed, stress and direction of movement of the relative piston (12, 13).
Abstract:
A pump drive assembly (10) including a driver (18), a pump drive member (36) driven by the driver (18), and a decoupler (20a) that decouples the drive member (36) from the driver (18) when a force acting upon the drive member (36) exceeds a threshold force. The pump drive member (36) can be a piston rod (36), and the decoupler (20a) can be a magnet (20a) attached to the piston rod (36) and coupled to a magnetically attracted plate (22) driven by the driver (18). When a force resisting movement of the piston rod (36) exceeds the magnetic force coupling the magnet (20a) to the plate (24), the magnet (20a) decouples from the plate (24), and the pumping operation ceases.
Abstract:
A valve unit for a fluid working machine comprise a valve having a valve member (and optionally a valve seat), a valve actuator coupled to the valve member, and an electronic actuator controller which is integral to the valve unit and configured to actively control the valve actuator to thereby control the valve member.
Abstract:
A pumping apparatus (2) for delivering liquid at high pressure at which compressibility of the liquid becomes noticeable. The pumping apparatus (2) comprises a first actuator (11) for actuating a first reciprocation piston (13) for pumping at least a part of the fluid, a second actuator (12) for actuating a second reciprocation piston (14) for pumping at least a part of the fluid, and a main drive (30) coupled to the first actuator (11) and to the second actuator (12). A phase shifter (49) is provided for varying a phase relationship between reciprocating motions of the first piston (13) and the second piston (14).
Abstract:
A fluid-working machine has a plurality of working chambers, e.g. cylinders ( 11 ), of cyclically changing volume, a high-pressure fluid manifold ( 14 ) and a low-pressure fluid manifold ( 16 ), at least one valve ( 13, 15 ) linking each working chamber to each manifold, and electronic sequencing means ( 20 ) for operating said valves in timed relationship with the changing volume of each chamber ( 11 ), wherein the electronic sequencing means is arranged to operate the valves of each chamber in one of an idling mode, a partial mode in which only part of the usable volume of the chamber is used, and a full mode in which all of the usable volume of the chamber ( 11 ) is used, and the electronic sequencing means ( 20 ) is arranged to select the mode of each chamber on successive cycles so as to infinitely vary the time averaged effective flow rate of fluid through the machine.