Abstract:
A manualy set electronic control for a fluid compression device includes a compressor (10) for pressurizing fluid and a controller (60) for indicating operating parameters and functions of the compressor. The controller graphically displays the parameters and functions, sets the limits of the parameters and controls the compressor (10) in response to any of the parameters reaching a preset level of the corresponding function. The controller (60) monitors which mode the compressor (10) is operating in, and changes the mode if the controller determines another mode would be more efficient. A computer (118) generates a signal. Communication systems are included whereby the signal from the computer (118) is communicated to the controller (60).
Abstract:
Systems and methods (e.g., a method for controlling and/or operating a compressor) are provided that includes the steps of monitoring a crankcase pressure of a first compressor; analyzing the monitored crankcase pressure that includes calculating an average of the crankcase pressure over a time period and comparing the average of the crankcase pressure over the time period to a nominal crankcase average pressure; identifying a condition of the first compressor based on the analysis of the monitored crankcase pressure; and adjusting operation of a second compressor to compensate for the first compressor in response to identifying the condition of the first compressor based on the analysis of the monitored crankcase pressure. (The method may be carried out automatically or otherwise by a controller.)
Abstract:
A compressor protection method and system capable of continuously establishing compressor discharge temperature set points based on actual in-service conditions and detecting damaged compressor valves for a given cylinder at each stage of compression. The method and system utilize sensors configured to monitor process property parameters (e.g. temperature and pressure) at the inlet section and outlet section of a compressor stage. The sensors generate monitored signals corresponding to the process property parameters. The method and system utilize a controller configured to receive and process these monitored signals. The controller executes a control logic that uses the monitored signals to either estimate or calculate compressor valve pressure losses for determining internal cylinder pressures, which are used to calculate compressor discharge temperature set points. The control logic compares the monitored temperature to the temperature set points and may generate a warning or normal operation signals based on results of the comparison.
Abstract:
A peristaltic pump has a sealed pumphead housing a and a pressure transducer 26 which is responsive to the pressure within the pumphead housing 8. The output 28 of the transducer 26 is processed to provide an indication of the condition of the hose 18 of the pump.
Abstract:
A controlled, variable displacement, wobble plate compressor includes a pivotable wobble plate driven through an improved drive and support linkage including a universal joint and having its pivot point offset from the axis of the drive shaft so that at the "no stroke" position the pistons are all disposed at their top-dead-center positions. The capacity of the compressor is controlled by an improved system for varying the position of the wobble plate.
Abstract:
A low oil pressure protection system for an air compressor control wherein a logic device is utilized to render said compressor inoperable when low oil pressure occurs, and timing means actuated during normal restarting cycles of the compressor after normal governor controlled stopping, to override protection control by said logic device.
Abstract:
PURPOSE: To improve controlling and responding properties by providing a control valve, increasing and decreasing the inner pressure of a crank chamber to increase and decrease the slant angle of the oscillating board by communicating the crank chamber with a suction chamber and a delivery chamber selectively in response to signals indicating predetermined parameters. CONSTITUTION: An elastic means 31, energizing the oscillating board 20 into the direction to decrease the slant angle thereof, and a control valve mechanism 38, connecting the crank chamber 42 to a suction pressure space 33 and a delivery pressure space 34 through first port 39 1 and the second port 39 2 in response to the signals indicating predetermined parameters to control the slant angle of the oscillating board 20 with good responding property by changing the inner pressure of the crank chamber 42 rapidly, are provided in the compressor. According to this method, a clutch is unnecessitated in the connection with an engine and high delivery pressure is introduced directly into the crank chamber 42 when the amount of delivery is to be decreased, therefore, very quick responding property may be obtained. COPYRIGHT: (C)1984,JPO&Japio
Abstract:
Beschrieben und dargestellt ist eine Drucküberwachungseinrichtung (1), insbesondere für einen Membrankompressor (2), mit mindestens einem Druckaufnehmer (3) zum Aufnehmen des Drucks innerhalb eines bestimmten Volumens (4), mit mindestens einem Rückschlagventil (5) und mit mindestens einem Sperrventil (6), zum Sperren des Rückschlagventils (5), wobei sich das Sperrventil (6) und das Rückschlagventil (5) jeweils in einem von einem Medium durchströmbaren Strömungspfad (7) zwischen dem Volumen (4) und dem Druckaufnehmer (3) befinden. Eine Drucküberwachungseinheit (1), die genaue Messwerte liefert und dennoch kostensparend realisiert werden kann wird dadurch ermöglicht, dass mindestens zwei Rückschlagventile (5,10) vorhanden sind, die antiparallel in jeweils einem Strömungspfad (7,12) angeordnet sind, wobei das erste Rückschlagventil (5) in Strömungsrichtung vom Volumen (4) zum Druckaufnehmer (3) und das zweite Rückschlagventil (10) in Strömungsrichtung vom Druckaufnehmer (3) zum Volumen (4) sperrt, und dass mindestens zwei Sperrventile (6,11) zum Sperren jeweils eines Strömungspfades (7,12) angeordnet sind.
Abstract:
Variable displacement compressor (10) comprising a crankcase, housing a tilted cam plate (26) connected to a rotary shaft (20); at least one piston (30) associated to the tilted cam plate (26), the tilted cam plate (26) transferring rotary movement of the rotary shaft (20) to reciprocating movement of the piston (30), the piston (30) being arranged in a cylinder bore (28), wherein, in operation, the piston (30) draws refrigerant at suction pressure into the cylinder bore (28) and compresses the refrigerant to a discharge pressure. The compressor (10) further comprises a control valve (52) for changing the crankcase pressure with respect to the suction pressure so as to change the angle of tilt of the cam plate (26); and a control unit (60) for operating the control valve (52). According to an important aspect of the invention, the control unit (60) comprises means (66, 68) for determining a pressure differential between a crankcase pressure and a suction pressure; and means for operating a control valve (52) based on the determined pressure differential.