Abstract:
A hydraulic pump (6) comprising: a housing (20) having first and second inlets (100a,100b) and first and second outlets (102a, 102b); a crankshaft (4) extending within the housing (20) and having axially offset first and second cams (62, 64); first and second groups (30, 32) of piston cylinder assemblies provided in the housing (20), each of the said groups (30, 32) having a plurality of piston cylinder assemblies having a working chamber of cyclically varying volume and being in driving relationship with the crankshaft (4); one or more electronically controllable valves (40) associated with the first and second groups (30, 32); and a controller (70) configured to actively control the opening and/or closing of the said electronically controllable valves (40) on each cycle of working chamber volume to thereby control the net displacement of fluid by the first and second groups (30, 32), wherein at least the first group (30) comprises a first piston cylinder assembly in driving relationship with the first cam (62) and a second piston cylinder assembly in driving relationship with the second cam (64), and wherein the first group is configured to receive working fluid from the first inlet (100a) and to output working fluid to the first outlet (102a) and the second group is configured to receive working fluid from the second inlet (100b) and to output working fluid to the second outlet (102b).
Abstract:
The invention relates to a compressor (1) having an adjustable displacement volume, comprising a driving chamber (17), in which a driving unit, which has pistons and cylinders, is arranged, wherein the piston stroke can be changed by means of an angle-adjustable drive disk (12) and thus the displacement volume can be adjusted by means of the pressure in the driving chamber (17), the compressor having a driving-chamber feed flow, by means of which refrigerant flows via an electrically adjustable control valve (2) from the high-pressure side (outlet-pressure side) into the driving chamber (17) and with a driving-chamber outlet flow across a fluidic resistance to the low-pressure side (suction-pressure side), such that the intermediate pressure (driving-chamber pressure) in the driving chamber (17), which lies between the outlet pressure and the suction pressure, sets the adjusting angle of the drive disk (12), and wherein a mechanical valve (200) that can be adjusted by means of pressure forces is arranged in the driving-chamber feed flow, in series after the electrically adjustable control valve (2) in the flow direction.
Abstract:
The invention features methods and apparatuses for determining replacement of components in liquid pressurization systems. A replaceable component (362) for use in a pump of a liquid pressurization system includes a body portion (366) and a data storage mechanism (370). The data storage mechanism (370) is in physical contact with the body portion (366). The data storage mechanism (370) is configured to communicate information to a reader (386) of the liquid pressurization system. The information is usable to determine a condition of replacement (e.g., a remaining usable life) of the replaceable component.
Abstract:
A volume control device having a housing with an inlet passage, an outlet passage, and an internal chamber communicating with the inlet and outlet passages. An accumulator is movably positioned within the internal chamber and substantially conforms with walls of the internal chamber, the accumulator including an internal passage allowing fluid flow therethrough. An one-way valve is positioned in the internal passage of the accumulator where the valve is biased in a closed position and an adjustable seat is positioned within the housing internal chamber between the accumulator and the housing outlet passage. A positioning mechanism engages the housing and adjustable seat whereby the position of the adjustable seat within the housing internal chamber may be adjustably fixed.
Abstract:
The present invention relates to methods for controlling double-suction line compressors for use in refrigeration systems, capable of meeting different requirements with regard to cost, efficiency and temperature control by means of techniques of various complexity levels and different configurations of the elements of the control network (temperature sensors, actuators, controllers, etc). Among the proposed solutions, a method is described for controlling and adjusting the refrigeration capacity of a refrigeration system equipped with a double-suction line compressor, the refrigeration system comprising compartments to be refrigerated and at least two evaporators (20) arranged in the compartments (60, 70) to be refrigerated, while the double-suction line compressor (10) can be controlled so as to vary its compression capacity. The method comprises the following steps: (i) continuously measuring at least one temperature by means of a temperature sensor (SET.SCT) associated with at least one of the evaporators (20); and (ii) on the basis of the measurement obtained in step (i), acting upon the compression capacity of the compressor (10).
Abstract:
A method for detecting and localizing a valve leak in a piston machine (1) having a shaft 24, where the method includes: - attaching at least one vibration sensor (16', 16", 16''') to a valve block (14', 14", 14'''), of the piston machine (1); - measuring the vibrations from all vibration sensors (16', 16", 16'''); - attaching a sensor (22) to the piston machine (1) where the sensor is designed to produce, directly or indirectly, an angular shaft position signal for the shaft (24), and where the method further includes: - determining, directly or indirectly, an angular shaft position signal for the shaft (24); - transforming the vibration signals from all vibration sensors (16', 16", 16''') into one envelope signal representing the instant vibration level; - using the window functions to find sector based averages of the vibration level, and - comparing said averages with a critical ambient vibration level to detect and localize leaks in one or two valves.
Abstract:
Systems and methods for pumping fluid comprising a pumping chamber, a pump inlet, a pump outlet, a valving mechanism, and a drive piston or pumping chamber wall including a deformable surface configured to provide elastohydrodynamic lubrication during operation.
Abstract:
A system and method for testing the operation of fuel pump is disclosed. The apparatus includes a pressure measurement portion, a flow measurement portion, an electrical diagnostic portion, and a fault simulation portion, where a user can simulate a number of potential fuel system failures to determine the diagnostics of the fuel system. The method includes the steps of measuring an electrical value related to said fuel pump, measuring a pressure related to said fuel pump, measuring a fuel flow related to said fuel pump, simulating a fuel system failure condition, and determining an operating status of said fuel pump.