Abstract:
Vorrichtung zur stufenlosen Regulierung des Schadraumvolumens eines Kolbenverdichters, gekennzeichnet durch eine Mehrzahl von im Zylinderkopf (20) angeordneten Einheiten (40), bestehend aus einem mit dem Schadraum kommunizierenden Stellzylinder und einem im Stellzylinder in seiner Position verschiebbar angeordneten Kolben, und Mitteln (50) zum Verstellen der Position der in den Stellzylindern angeordneten Kolben zur Veränderung des Schadraumvolumens.
Abstract:
Disclosed is a device for infinitely varying the clearance volume of a piston compressor. Said device is characterized by a plurality of units (40) which are disposed inside the cylinder head (20) and are composed of an adjusting cylinder that communicates with the clearance volume, and a piston, the position of which can be adjusted within the adjusting cylinder. The device is further characterized by means (50) for adjusting the position of the pistons located in the adjusting cylinders in order to modify the clearance volume.
Abstract:
Die Erfindung betrifft einen aufgeladenen Kompressor (10) zur Druckluftversorgung eines Nutzfahrzeugs (12) mit einem Kolbenraum (14), einem Schadraum (16) und einer Ventileinrichtung (18) zum Schalten des Schadraumes (16). Erfindungsgemäß ist vorgesehen, dass die Ventileinrichtung (18) in der Weise ausgebildet ist, dass das von dem aufgeladenen Kompressor (10) geförderte Luftvolumen durch Zuschalten von Schadraum (16) auf einen von Null verschiedenen Wert reduzierbar ist. Die Erfindung betrifft weiterhin ein Verfahren zur Steuerung eines aufgeladenen Kompressors (10) zur Druckluftversorgung eines Nutzfahrzeugs (12) mit einem Kolbenraum (14), einem Schadraum (16) und einer Ventileinrichtung (18) zum Schalten des Schadraumes (16).
Abstract:
According to some embodiments, system and methods are provided, comprising providing a dual-mode model for a reciprocating compressor, wherein the model includes a measurement mode and a tuning mode; receiving one or more inputs to the model from an operating reciprocating compressor; and in response to receipt of the one or more inputs, executing the model in at least one of the measurement mode and the tuning mode, wherein: in a measurement mode, execution of the model further comprises calculating an actual flow rate of gas in the compressor based on the one or more inputs; and in a tuning mode, execution of the model further comprises calculating one of an unloader setting and a speed set point of a physical element of the compressor for a given flow rate of gas. Numerous other aspects are provided.
Abstract:
A supercharged compressor and method of operating the compressor supplies a commercial vehicle with compressed air. The compressor includes a piston chamber, a dead space or clearance volume and a valve unit for switching the clearance volume. The valve element is configured such that the air volume supplied by the supercharged compressor can be reduced to a value that is different from zero by activating the clearance volume.
Abstract:
A method for control of the drive means for a reciprocating piston pump delivering liquid to a spring loaded piston liquid accumulator providing high volume compliance whereby the accumulator liquid volume is controlled within narrow limits by continuous control of power to the pump drive motor. The accumulator achieves high volume compliance by arranging the kinematics of a main spring loading the accumulator piston to have a negative spring rate equal to the sum of all other positive spring rates produced by a second spring used to adjust the accumulator pressure, by the diaphragm (piston), and by a flexure support for a sensor lever. This sensor lever moves with the accumulator diaphragm to actuate an optical sensor producing an electric signal indicative of small changes in liquid volume in the accumulator. This signal in turn continuously modulates the power to the motor driving the pump so as to maintain the accumulator liquid volume close to a datum value during a large portion of the pump delivery cycle. This close control of liquid volume in a high compliance accumulator provides substantially constant pulse free pressure liquid delivery from a pulsatile pump. The second spring may be adjusted to modify this constant pressure without disturbing the balance between positive and negative spring rates. Adjustment may be manual or automatic in response to liquid temperature whereby liquid pressure is automatically increased with lower liquid temperatures to compensate for increased liquid viscosity to maintain liquid flow substantially constant through an apparatus such as flow cytometry used for particle analysis or particle sorting.
Abstract:
A liquid supply system including a diaphragm pump, a novel liquid accumulator providing exceptionally high volume compliance, and a control of accumulator volume within narrow limits by continuous control of the pump motor. The accumulator achieves high volume compliance by arranging the kinematics of a main spring loading the accumulator to have a negative spring rate equal to the sum of all other positive spring rates produced by a second spring used to adjust the accumulator pressure, by the diaphragm, and by a pivot for a sensor lever. This lever moves with the diaphragm to actuate an optical sensor producing an signal indicative of small changes in liquid volume in the accumulator. This signal continuously modulates the power to the motor driving the pump so as to maintain the accumulator volume lose to a datum valve. This close control of liquid volume in a high compliance accumulator provides substantially pulse-free constant pressure liquid delivery from a pulsatile pump. The second spring may be adjusted to modify this constant pressure without disturbing the balance between positive and negative spring rates. Adjustment may be automatic in response to a variable such as liquid temperature whereby liquid pressure is automatically increased with lower liquid temperature to maintain liquid flow substantially constant through a flow cytometry apparatus used for particle analysis.
Abstract:
A hydraulic pressure intensifier (1) is described comprising a housing (2) having a low pressure chamber (3) and a high pressure chamber (4), force transmitting means (5) between the low pressure chamber (3) and the high pressure chamber (4), and a switching valve (8) connecting the low pressure chamber (3) to a first pressure or to a second pressure different from the first pressure. It is intended to have a large volume on the high pressure side of the pressure intensifier. To this end the switching valve (8) is controlled by a pilot valve 18.