Abstract:
A system for the transport of high solids sludge includes a positive displacement pump for pumping sludge through a pipeline. The volume of sludge transported is accurately measured by determining the fill percentage during pumping cycle.
Abstract:
[Problems] To provide a driving method for a metering pump, a driving apparatus for a metering pump, a vaporizer and an anesthesia apparatus which are capable of suppressing a pulsation in the metering pump, and lowering the costs and reducing the sizes of the vaporizer and the anesthesia apparatus. [Means for solving the Problems] A metering pump 16 is joined to the stepping motor 15, includes an eccentric mechanism converting a revolving motion of the stepping motor 15 into a reciprocating motion of a plunger 16A, and makes a constant liquid delivery by sucking and discharging an anesthetic agent through variations in the cubic volume of a cylinder 16D caused by the reciprocating motion of the plunger 16A. The control section 12: calculates a suction and discharge cycle T of the metering pump 16 on the basis of a set anesthetic-gas concentration and a fresh-gas flow rate; sets a discharge period T2 of the cycle T to be longer than a suction period T1 of the cycle T; and controls the revolution speed of the stepping motor 15 so that the travelling speed of the plunger 16A is kept constant during the discharge period T2.
Abstract:
An actuation system for a resonant linear compressor (50), applied to cooling systems, the latter being particularly designed to operate at the electromechanical frequency of said compressor (50), so that the system will be capable of raising the maximum power supplied by the linear actuator, in conditions of overload of said cooling system. Additionally, an actuation method for a resonant linear compressor (50) is disclosed, the operation steps of which enable one to actuate the equipment at the electromechanical resonance frequency, as well as to control the actuation thereof in over load conditions.
Abstract:
Bei einem Verfahren zum Betrieb eines Pumpensystems mit einer pulsatilen Membranblutpumpe (2) zum abwechselnden Ansaugen und Ausstoßen von Blut im Blutkreislauf eines Patienten, die mittels einer Druckleitung (3) mit einer Arbeitspumpe (4) antreibbar ist, wobei die Arbeitspumpe einen mittels eines Antriebsaggregats (24) oszillierend antreibbaren Arbeitskolben (18) aufweist, stellt sich die Aufgabe, die Arbeitspumpe effizienter als bisher anzusteuern und damit ein dynamischeres Verhalten und eine bessere Regelbarkeit der Pumpe zu erreichen.
Abstract:
Dosierpumpenaggregat mit einem Dosierraum (6), einem diesen begrenzenden, durch einen Verdrängerantrieb (22) bewegbaren Verdrängerkörper sowie einer Steuereinrichtung (30) zum Ansteuern des Verdrängerantriebs (22). Die Steuereinrichtung (30) ist derart ausgebildet, dass sie zumindest in einem bestimmten Betriebszustand den Verdrängerantrieb (22) derart ansteuert, dass ein Hub, insbesondere Druckhub, des Verdrängerkörpers mit einer ersten geringeren Hubgeschwindigkeit begonnen wird und im weiteren Verlauf des Hubes (36) die Hubgeschwindigkeit auf eine zweite erhöhte Hubgeschwindigkeit erhöht wird. Verfahren zur Steuerung des Verdrängerantriebs (22) eines solchen Dosierpumpenaggregates.
Abstract:
A liquid pressurizing device comprises a reciprocating pump (1), pressure sensor (23) and pressure control unit (25) which is adapted to control the motion of the plungers (5A, 5B) so as to make an actual delivery pressure value reach a predetermined threshold and, after reaching the threshold, control the actual delivery pressure value so as to determine an optimum feed rate, and thereafter maintain the feed rate of the plungers at constant to the optimum feed rate. The pressure control means (25) may include a proportional control element for performing, after the actual delivery pressure value has reached the threshold, the proportional control of the actual delivery pressure value during a time until the plungers (5A, 5B) first reach the forward stroke end thereof.
Abstract:
A liquid pressurizing device, comprising a plunger pump (1), a pressure sensor (23), and a pressure control part (25) which moves plungers (5A, 5B) so as to make an actual delivery pressure value reach a predetermined threshold and, after the acual delivery pressure value reaches the threshold, controls the actual delivery pressure value so as to determine an optimum feedrate, and then maintains the optimum feed rate at a constant, wherein the pressure control part (25) comprises a proportional element which, after the actual delivery pressure value reaches the threshold, proportionally controls the actual delivery pressure value while the plungers (5A, 5B) first reach the forward ends thereof.
Abstract:
The invention relates to an oscillating armature diaphragm pump comprising a coil (7) that drives the oscillating armature (8) and comprising a control device (10) that periodically applies a drive voltage to the coil (7). In order to measure the flow rate between two successive applications of the drive voltage to the coil (7) during the time, during which no drive is effected, the voltage existing on the coil (7) is detected and a flow rate measurement signal (12) is generated therefrom.
Abstract:
A linear compressor drive device (101) comprising an inverter (2) for supplying a drive current of a specified frequency to a linear compressor (100), wherein an inverter controller (6) is provided to control the inverter (2) so that the frequency of an output current therefrom is a resonance frequency based on resonance frequency information and to measure the instantaneous values of the output current Id and output voltage Vd of the inverter (2) at a phase timing that renders zero a change in the output current Id of the inverter (2) to thereby calculate a piston stroke from the measured values. Such a linear compressor drive device (101) can detect accurately the piston stroke and top clearance of a linear compressor by a simple processing without using a position sensor.
Abstract:
A liquid pressurizing device comprises a reciprocating pump (1), pressure sensor (23) and pressure control unit (25) which is adapted to control the motion of the plungers (5A, 5B) so as to make an actual delivery pressure value reach a predetermined threshold and, after reaching the threshold, control the actual delivery pressure value so as to determine an optimum feed rate, and thereafter maintain the feed rate of the plungers at constant to the optimum feed rate. The pressure control means (25) may include a proportional control element for performing, after the actual delivery pressure value has reached the threshold, the proportional control of the actual delivery pressure value during a time until the plungers (5A, 5B) first reach the forward stroke end thereof.