Abstract:
The invention is a method and apparatus for significantly improving the performance of a reciprocating pump by delivering the pumping fluid at a desired pressure and flow rate with minimal flow fluctuations. The compressibility of the pumping fluid directly effects volumetric flow rate and mass flow rate. The method includes the step of sensing various pump parameters related to said compressibility and adjusting the pumping speed to make appropriate accommodations. In particular, the compressibility of the pumping fluid is effected by the adiabatic heating of the pumping fluid during compression, variations in pumping fluid density, leaks in the check valves of cylinder/piston seals and the primary and secondary switching losses in the fluid flow occurring when the primary and secondary pistons reverse direction.
Abstract:
Systems and methods of the invention may overcome a higher than normal starting torque for in a reciprocating, electric motor driven air compressor for a vehicle. A detection component can be configured to detect a stall condition for a reciprocating compressor based on a force from compressed air being compressed into a reservoir of the reciprocating compressor. Based upon the detected stall condition, a controller can reverse direction or increase torque to alleviate the stall condition. In the reverse direction mode, the controller component can change a direction of a piston rotation. In the torque increase mode, the controller increases a number of poles for the motor, a line voltage, or a volt/hertz.
Abstract:
A method and apparatus for analyzing the operating condition of a machine, such as a reciprocating compressor (10), is provided. The method comprises testing for fluid flow across the closed suction and discharge valves (30-33), as well as leakage across the piston (16), when the machine is in a non-operating condition. The test apparatus may be removable attached externally to the machine by connection to the Kiene head end indicator cock (22) and the crank end indicator cock (24) or the apparatus may be built in internally of the machine.
Abstract:
A method for detection of a fluid leak related to at least one piston machine (1), where the method includes: - attaching a pressure sensor (18, 24) to at least a pressure side of the at least one piston machine (1); - measuring the pressure on the pressure side of the at least one piston machine (1); - attaching a transmitter (28) to the at least one piston ma-chine (1), said transmitter (28) rendering a signal for cal-culating the rotational speed of the at least one piston ma-chine (1); - calculating the speed of the at least one piston machine (1); - calculating the sum of nominal flow rates from all piston machines(1); - calculating a flow rate compensation factor; - calculating a normalized pressure (42) to be equal to the discharge pressure multiplied by the said compensation factor for the flow rate; and - monitoring the normalized pressure (42) to detect a leak-age.
Abstract:
Die Erfindung betrifft ein System zum Dosieren eines Fluids von einem Vorratstank (4) an eine Dosiereinheit (3), umfassend eine Dosierpumpe (2), die durch eine Tankleitung (9) mit dem Vorratstank (4) und durch eine Dosierleitung (5) mit der Dosiereinheit (3) jeweils in Fluidverbindung steht, wobei ein Betätigen der Dosierpumpe (2) das Fluid aus dem Vorratstank (4) zur Dosiereinheit (3) fördert, wobei zwischen Dosierpumpe (2) und Dosiereinheit (3) ein in Richtung der Dosiereinheit (3) öffnendes Rückschlagventil vorgesehen ist, welches in seiner Schließstellung leckagebehaftet ist, wobei in einer vorbestimmten Betriebsstellung der Dosierpumpe (2) eine Fluidverbindung von dem Rückschlagventil zum Vorratstank (4) vorliegt, so dass ein Fluid-Leckagestrom in Richtung des Vorratstanks (4) eine Druckminderung in der Dosierleitung (5) bewirkt. Ein System zum Dosieren eines Fluids von einem Vorratstank an eine Dosiereinheit, bei dem mit einfach Mitteln eine sicher betätigbare Druckentlastung des Leistungssystems zwischen Dosierpumpe und Dosiereinheit möglich ist, wird erfindungsgemäß dadurch geschaffen, dass die Dosierpumpe (2) in Form einer magnetisch betätigbaren Hubkolbenpumpe (2) mit einem Kolben ausgeführt ist, dass der Kolben zwischen einer Ausgangsstellung, in der eine Fluidverbindung zwischen Dosierpumpe (2) und Vorratstank (4) geschlossen ist, und einer Endstellung, in der ein Förderhub in Richtung der Dosiereinheit (3) ausgeführt ist, verschiebbar ist, und dass der Kolben in der vorbestimmten Betriebsstellung der Dosierpumpe (2) in einer Zwischenstellung zwischen der Ausgangsstellung und der Endstellung angeordnet ist.
Abstract:
Systems and methods of the invention may overcome a higher than normal starting torque for in a reciprocating, electric motor driven air compressor for a vehicle. A detection component can be configured to detect a stall condition for a reciprocating compressor based on a force from compressed air being compressed into a reservoir of the reciprocating compressor. Based upon the detected stall condition, a controller can reverse direction or increase torque to alleviate the stall condition. In the reverse direction mode, the controller component can change a direction of a piston rotation. In the torque increase mode, the controller increases a number of poles for the motor, a line voltage, or a volt/hertz.
Abstract:
A method for detection of a fluid leak related to at least one piston machine (1), where the method includes: - attaching a pressure sensor (18, 24) to at least a pressure side of the at least one piston machine (1); - measuring the pressure on the pressure side of the at least one piston machine (1); - attaching a transmitter (28) to the at least one piston ma-chine (1), said transmitter (28) rendering a signal for cal-culating the rotational speed of the at least one piston ma-chine (1); - calculating the speed of the at least one piston machine (1); - calculating the sum of nominal flow rates from all piston machines(1); - calculating a flow rate compensation factor; - calculating a normalized pressure (42) to be equal to the discharge pressure multiplied by the said compensation factor for the flow rate; and - monitoring the normalized pressure (42) to detect a leak-age.