Abstract:
A method of partially fabricating a precisely dimensioned fuel pump wherein selected pump elements are partially assembled before those elements are machined. After machining, the partially assembled elements exhibit enhanced concentricity.
Abstract:
An improved method and apparatus for adjusting the flow of a diaphragm pump. The thickness of the diaphragm itself is capable of being adjusted. Full stroke output is thereby reduced in inverse proportion to the increased volume occupied by the diaphragm. Adjusting the thickness of the diaphragm while the pump is operating provides a means of varying pump output without stopping the pump for adjustments or modifications.
Abstract:
An apparatus for controlling an electrohydraulic system of a work machine having an engine that drives a variable displacement pump is disclosed. The apparatus includes a pump displacement setting device that produces a pump command signal, a pressure sensor that detects the fluid pressure associated with the variable displacement pump and produces a pressure signal, and an engine speed sensor that detects the speed of the engine and produce an engine speed signal. A microprocessor computes the torque demand on the engine in response to the desired pump displacement, determines a torque limit associated with the engine in response to the engine speed, and responsively modifies the pump command signal to limit the engine torque.
Abstract:
A hydraulic oil well pump drive system for driving an oil well sucker rod includes a master piston positioned within a master cylinder for axial displacement between first and second ends of the master cylinder. The master piston has a piston drive rod which extends through one end of the master cylinder. The drive rod is connected to a crank pin of an eccentric crank. A center seal assembly divides the master cylinder into a working chamber and a pressure chamber in opposite ends of the master cylinder. Each respective chamber defines a fluid volume which varies with the displacement of the master piston. The master piston displacement creates a bi-directional flow of working fluid from the working chamber. A wellhead hydraulic assembly is operably connected to the oil well sucker rod and is in fluid communication with the master cylinder working chamber to receive the working fluid flow. The wellhead hydraulic assembly is responsive to the working fluid flow to reciprocate an oil well sucker rod at a rate which relates to the rate of master piston displacement. A gas accumulator is in fluid communication with the master cylinder pressure chamber to bias the master piston toward the master cylinder working end, providing an upward biasing force at the wellhead hydraulic assembly.
Abstract:
Linear compressor comprising a resonant linear motor (4) having a stator (9) and a linear displacer (3), the linear motor (4) cooperating with a resonant spring (2) that is driven by the linear displacer (3) at one of the ends of the resonant spring (2) with the opposite end of the resonant spring (2) cooperating with a mechanical actuation element (1). A variation sensor of magnetic flux (5) cooperates with the resonant spring (2). Said variation sensor of magnetic flux (5) comprising a fixed part (7) and a movable part (6), the movable part (6) coupled to the end of the resonant spring (2) opposite to the end cooperating with the linear displacer (3). The variation sensor of magnetic flux (5) is the sole means required to determine the displacement amplitude and the frequency of oscillation of the displacer (3) of the linear motor (4). Corresponding method for controlling the stroke in such a linear compressor.
Abstract:
Fluidisches Zumesssystem (1), umfassend eine durch Elektromagneten mit einer Spule angetriebene Hubkolbenpumpe (3), eine elektrische Ansteuerung (7), mindestens eine Leitung (4), und ein der Hubkolbenpumpe (3) nachgelagertes Zumessventil (5). Ein mit geringem Aufwand herstellbares Zumesssystem bzw. Verfahren, das eine hohe Genauigkeit der Mengenzumessung und eine Beeinflussung des Drucks bei der Zumessung ermöglicht wird erfindungsgemäß dadurch geschaffen, dass die Pumpe (3) druckregelnd ausgebildet ist und eine durch eine Kraft begrenzte Verdrängung aufweist, und dass die Pumpe (3) so aufgebaut ist, dass sich eine definierte funktionale Abhängigkeit des Druckes von dem Hub des Kolbens und eine weitere funktionalen Abhängigkeit des Kolbenhubs von der Ansteuerfrequenz und dem Verbrauchsvolumenstrom ergibt, wobei das Ansteuersignal von der elektrischen Ansteuerung (7) an die Pumpe (3) ein gepulstes Signal des Stroms durch die Spule ist, oder der Spannung, die an der Spule der Hubkolbenpumpe anliegt ist.
Abstract:
A system for controlling the stroke of an air-operated double diaphragm pump 12 includes a first control valve 30 and a second control valve 34 disposed in parallel within a drive air outlet conduit 28. The first flow control valve 30 has a first air flow capacity and the second flow control valve 34 has a second air flow capacity which is less than about 50% of the first air flow capacity.
Abstract:
Hermetisch gekapselter Kältemittelverdichter (1), umfassend ein Zylindergehäuse (3) und einen in einer Kolbenbohrung (8) des Zylindergehäuses (3) entlang einer definierten Kolbenlauffläche (9) geführten Kolben (6), welcher mittels eines Pleuels (7) an einer von einem E-Motor (13) angetriebenen Kurbelwelle (5) angelenkt ist, wobei die Kurbelwelle (5) in einem vorzugsweise einstückig mit dem Zylindergehäuse (3) ausgeführten Lagerungskörper (2) gelagert ist, wobei die Kolbenbohrung (8) in einem ersten Endbereich (8a) von einem eine Ventilplatte (16) umfassenden Zylinderkopf (15) verschlossen ist, während die Kolbenbohrung (8) in einem der Kurbelwelle (5) zuweisenden zweiten Endbereich (8b) offen für die Aufnahme des Kolbens (6) ist. Erfindungsgemäß ist es vorgesehen, dass die Kolbenbohrung (8) einen an die Kolbenlauffläche (9) anschließenden, im zweiten Endbereich (8b) der Kolbenbohrung (8) angeordneten Freilaufabschnitt (10) aufweist, dessen lichte Öffnungsweite (10') größer als der Durchmesser (9') der Kolbenlauffläche (9) ist, um die Kontaktierung zwischen Kolben (6) und Zylindergehäuse (3) in diesem Abschnitt zu verhindern.
Abstract:
The present invention discloses a linear compressor which can rapidly overcome load and improve compression efficiency, by synchronizing an operation frequency of a linear motor (10) with a natural frequency of a movable member (6) varied b y the load and varying a stroke of the movable member (6) according to the load. The linear compressor includes a fixed member (4) having a compression space (9) inside, a movable member (6) linearly reciprocated in the fixed member (4) in the axial direction, for compressing refrigerants sucked into the compression space (9), one or more springs (8a, 8b) installed to elasticaily support the movable member (6) in the motion direction of the movable member (6), spring constants of which being varied by load, and a linear motor (10) installed to be connected to the movable member (6), for linearly reciprocating the movable member (6) in the axial direction, and varying a stroke of the movable member (6) according to a predetermined refrigeration force, so that the movable member (6) can be linearly reciprocated to reach a top dead center.
Abstract:
Rotational force from a driving device 11 is transmitted to an eccentric cam 32 through a rotating rod 31, and the eccentric cam 32 causes a piston 22 and a piston rod 25 to move up and down in a reciprocating manner by its rotation. Atmospheric air is inspired into a first chamber R1 in a cylinder 21 upon the descent of the piston 22. Upon the rise of the piston 22, the air in the first chamber R1 is compressed, and the compressed high-pressure air is discharged to an accumulator 12 through a discharge valve 25. The accumulator communicates with a second chamber R2 in the cylinder 21. When the air pressure in the accumulator 12 increases, this high-pressure air pushes the piston 22 to cancel the contact between the piston rod 26 and the eccentric cam 32, whereby the power transmission from a power transmission device 30 to a pressure conversion mechanism 20 is cut off.