Abstract:
The invention relates to a method for controlling a compressor of a refrigeration system, said compressor having a motor, wherein the temperature of the cooling point is controlled by means of switch-on and switch-off operation of the motor if the temperature in the compressor exceeds an upper temperature threshold and the temperature of the cooling point is controlled by means of continuously switched-on operation of the motor as soon as the motor has cooled down to a lower temperature threshold, wherein the control system converts a manipulated variable corresponding to the cooling demand of the cooling point into a switching signal for a valve, which switching signal causes clocked opening and closing of the valve, or a frequency converter controls the refrigerant flow through the compressor by controlling the voltage and the frequency of the motor, in that the frequency converter converts a manipulated variable corresponding to the cooling demand of a cooling point into a voltage and a frequency for the motor.
Abstract:
A compressor may include a shell, a compression mechanism, first and second temperature sensors, and a control module. The shell may define a lubricant sump. The compression mechanism may be disposed within the shell and may be operable to compress a working fluid. The first temperature sensor may be at least partially disposed within the shell at a first position. The second temperature sensor may be at least partially disposed within the shell at a second position that is vertically higher than the first position. The control module may be in communication with the first and second temperature sensors and the pressure sensor and may determine whether a liquid level in the lubricant sump is below a predetermined level based on data received from the first and second temperature sensors.
Abstract:
An electric hydraulic hybrid motor which can be made smaller in size and provide good performance. To this end, a hydraulic pump (20) and a hydraulic motor (60) are disposed inwardly, respectively, of a stator (12) of an electric motor (10) and a rotor (14), and the hydraulic pump (20) comprises a cylinder block (21) for a pump which is adapted to rotate together with the rotor (14) and a plunger (23) for the pump, and the hydraulic motor (60) comprises a cylinder block (61) for the motor and a plunger (23a) for the motor.
Abstract:
In a lubricant-cooled gas compressor (10) the temperature of separated lubricant returned to the air-side (11) is monitored by a thermostatically controlled restrictor valve (22) which minimises the flow of returned lubricant when temperature is low as on start up or when running on reduced load but increases the flow as the lubricant temperature increases. This will minimise the condensation of water from indrawn air when the temperature of the compressed air is too low to retain the water as vapour, so that the returned lubricant is contaminated with water which will damage the moving components of the air-end.
Abstract:
The invention relates to a compressor for a refrigerating agent in a cooling circuit. Said compressor comprises a drive unit (12), a compressor unit which is preferably lubricated by means of an oil circuit (50), and a compressor housing (16) for receiving at least the compressor unit (12) and optionally the drive unit (12). A monitoring device (18) is provided for detecting cases of malfunction. The monitoring device controls the operating state of the compressor according to mechanical vibrations of the same, said vibrations being detected on a measuring point in the region of the compressor housing (16).
Abstract:
A method comprising determining a first temperature of an oil inside a compressor (1); determining a second temperature at a moveable part (5) of the compressor (1), wherein the second temperature at the moveable part (5) is determined at a stationary part (4) of the compressor (1) being in contact with the moveable part (5); and deriving whether the compressor (1) operates in a safe mode or in an unsafe mode based on an analysis of the determined first temperature and the determined second temperature at the moveable part (5).
Abstract:
In a lubricant-cooled gas compressor (10) the temperature of separated lubricant returned to the air-side (11) is monitored by a thermostatically controlled restrictor valve (22) which minimises the flow of returned lubricant when temperature is low as on start up or when running on reduced load but increases the flow as the lubricant temperature increases. This will minimise the condensation of water from indrawn air when the temperature of the compressed air is too low to retain the water as vapour, so that the returned lubricant is contaminated with water which will damage the moving components of the air-end.
Abstract:
An electric hydraulic hybrid motor, control device and control method for the same, the hybrid motor being small in size and simple in construction and when required able to be equal-horse-power controlled or torque limiter controlled. To this end, an electric hydraulic hybrid motor comprises a cylinder block (21) provided for common use on an oil pressure pump (20) and a hydraulic motor (50) so as to rotate together with a rotor (14), a plurality of plungers (23) provided on the hydraulic pump (20) so as to rotate integrally with the rotor (14), a plurality of plungers (23a) provided on the hydraulic motor (50), a variable swash plate control means (33) for setting a discharge volume for the hydraulic motor (20), a swash plate setting means (56) for setting a discharge volume for the hydraulic motor (50) and a case (11) in which these constituent members are disposed.