Abstract: In order to improve a method for operating status determination of a refrigerant compressor/expander comprising a compressor unit and a drive unit such that information on the operating status of a refrigerant compressor/expander which is as reliable as possible can be obtained, it is proposed that, for at least one bearing of the refrigerant compressor/expander, a load value resulting from an operation of said refrigerant compressor/expander and a speed value are determined and in that, on the basis of the speed value and the load value and also at least one operating parameter, there is determined for the at least one bearing an operating prediction value for a future maintenance-free operation of the refrigerant compressor/expander.

Abstract: A compressor unit including a screw compressor having a compressor housing that has a screw rotor chamber arranged in the compressor housing, two screw rotors that are arranged in the screw rotor chamber and are mounted on the compressor housing to be rotatable about a respective screw rotor axis, and at least one control slider, which is arranged in a slider channel of the compressor housing, is adjacent to both screw rotors and is movable in a direction of displacement parallel to the screw rotor axes and takes a form such that it affects the final volume and/or the initial volume, wherein there is provided on the screw compressor a compressor operational control unit that takes a form such that it performs a compressor operating function that assists at least one operation of the compressor unit.

Abstract: A compressor unit including a screw compressor having a compressor housing that has a screw rotor chamber arranged in the compressor housing, two screw rotors that are arranged in the screw rotor chamber and are mounted on the compressor housing to be rotatable about a respective screw rotor axis, and at least one control slider, which is arranged in a slider channel of the compressor housing, is adjacent to both screw rotors and is movable in a direction of displacement parallel to the screw rotor axes and takes a form such that it affects the final volume and/or the initial volume, wherein there is provided on the screw compressor a compressor operational control unit that takes a form such that it performs a compressor operating function that assists at least one operation of the compressor unit.

Abstract: In order to improve an expansion system for a working medium that is used in particular in a circulating process of a system that utilises waste heat, in particular in a system operating in a Rankine cycle, comprising an expansion device coupled to an electricity generator, for the working medium, an inlet for supplying the pressurised working medium, and an outlet for the working medium that has been expanded by the expansion device, it is proposed that an aerosol generator unit that generates a lubricant aerosol should be associated with the inlet, wherein the working medium guided to the expansion device flows through this aerosol generator unit, which has a flow guide for the working medium having a concentration section that concentrates lubricant entrained in the total mass flow of working medium supplied to the expansion device to give aerosol particles, and these aerosol particles leave the concentration section together with a partial mass flow of the working medium, branching off from the total mass

Abstract: A screw compressor includes a compressor housing which has a screw rotor chamber arranged therein. Two screw rotors are arranged in the screw rotor chamber. At least one control slider is arranged in a slider channel of the compressor housing and is adjacent to both screw rotors by means of slider compression wall surfaces. The control slider is moveable in a direction of displacement parallel to the screw rotor axes. There is a position determining device for the at least one control slider. The position determining device has a position indicator that is coupled to the at least one control slider. The position indicator cooperates with a detector that extends parallel to the direction of displacement of the at least one control slider and along which the position indicator is moveable. The detector element is coupled to an evaluation device that determines the positions of the position indicator along the detector.

Abstract: A refrigerant compressor particularly a rotary screw compressor comprising a compressor housing, a compressor element which is driven by a drive and is arranged in said compressor housing, at least one bearing unit for at least one element of the drive which comprises at least one bearing housing and at least one roller bearing that is arranged in the bearing housing. Lubricant is supplied by a lubricant distribution system to the bearing housing and a lubricant dispensing unit which comprises a filter holding chamber and a filter body that is arranged in the filter holding chamber is associated with the bearing housing.

Abstract: A compressor unit including a screw compressor having a compressor housing that has a screw rotor chamber arranged in the compressor housing, two screw rotors that are arranged in the screw rotor chamber and are mounted on the compressor housing to be rotatable about a respective screw rotor axis, and at least one control slider, which is arranged in a slider channel of the compressor housing, is adjacent to both screw rotors and is movable in a direction of displacement parallel to the screw rotor axes and takes a form such that it affects the final volume and/or the initial volume, wherein there is provided on the screw compressor a compressor operational control unit that takes a form such that it performs a compressor operating function that assists at least one operation of the compressor unit.

Abstract: In order to improve an expansion system for a working medium that is used in particular in a circulating process of a system that utilises waste heat, in particular in a system operating in a Rankine cycle, comprising an expansion device coupled to an electricity generator, for the working medium, an inlet for supplying the pressurised working medium, and an outlet for the working medium that has been expanded by the expansion device, it is proposed that an aerosol generator unit that generates a lubricant aerosol should be associated with the inlet, wherein the working medium guided to the expansion device flows through this aerosol generator unit, which has a flow guide for the working medium having a concentration section that concentrates lubricant entrained in the total mass flow of working medium supplied to the expansion device to give aerosol particles, and these aerosol particles leave the concentration section together with a partial mass flow of the working medium, branching off from the total mass

Abstract: A screw compressor, including a compressor housing having a screw rotor chamber arranged therein, two control sliders that are arranged in the screw rotor chamber and on the compressor housing and whereof at least one is arranged in a slider channel of the compressor housing and that are adjacent to both screw rotors by means of slider compression wall surfaces, which is movable in a direction of displacement parallel to the screw rotor axes, a position determining device for the at least one control slider, wherein the position determining device has a position indicator element that is coupled to the at least one control slider, wherein the at least one position indicator element cooperates with a detector element that extends parallel to the direction of displacement of the at least one control slider and along which the position indicator element is movable, and in that the detector element is coupled to an evaluation device that determines the positions of the position indicator element along the detecto

Abstract: A refrigerant compressor particularly a rotary screw compressor comprising a compressor housing, a compressor element which is driven by a drive and is arranged in said compressor housing, at least one bearing unit for at least one element of the drive which comprises at least one bearing housing and at least one roller bearing that is arranged in the bearing housing. Lubricant is supplied by a lubricant distribution system to the bearing housing and a lubricant dispensing unit which comprises a filter holding chamber and a filter body that is arranged in the filter holding chamber is associated with the bearing housing.

Abstract: In order to improve a screw compressor comprising a housing, at least one screw rotor arranged in a compressor housing of the housing, a lubricant sump which is arranged on the high pressure side and in which lubricant collects, and a lubricant supply device which supplies lubricant from the lubricant sump to the at least one screw rotor, in such a manner that the amount of circulating lubricant can be kept as small as possible for adequate lubrication, it is suggested that the lubricant supply device comprise a first lubricant supply system and a second lubricant supply system, that the first lubricant supply system supply lubricant to the at least one screw rotor during operation of the screw compressor and that the second lubricant supply system additionally supply lubricant to the at least one screw rotor and thereby be activatable and deactivatable.

Abstract: In order to improve a screw compressor comprising an outer housing, a compressor screw housing which is arranged in the outer housing and in which rotor bores for screw rotors are arranged, a drive arranged in the outer housing on one side of the compressor screw housing, a bearing housing arranged in the outer housing on a side of the compressor screw housing located opposite the drive and a sound damping device which is arranged within the outer housing and has compressed working medium flowing through it, in such a manner that the working medium leaving the screw compressor carries as little lubricant as possible along with it, it is suggested that the sound damping device guide the compressed working medium by means of a flow guide in an interior space as a circulating flow circulating around an axis and that lubricant be separated from the circulating flow of the working medium as a result of centrifugal forces.

Abstract: In order to improve a screw compressor comprising a housing, at least one screw rotor arranged in a compressor housing of the housing, a lubricant sump which is arranged on the high pressure side and in which lubricant collects, and a lubricant supply device which supplies lubricant from the lubricant sump to the at least one screw rotor, in such a manner that the amount of circulating lubricant can be kept as small as possible for adequate lubrication, it is suggested that the lubricant supply device comprise a first lubricant supply system and a second lubricant supply system, that the first lubricant supply system supply lubricant to the at least one screw rotor during operation of the screw compressor and that the second lubricant supply system additionally supply lubricant to the at least one screw rotor and thereby be activatable and deactivatable.

Abstract: In order to improve a screw compressor comprising an outer housing, a compressor screw housing which is arranged in the outer housing and in which rotor bores for screw rotors are arranged, a drive arranged in the outer housing on one side of the compressor screw housing, a bearing housing arranged in the outer housing on a side of the compressor screw housing located opposite the drive and a sound damping device which is arranged within the outer housing and has compressed working medium flowing through it, in such a manner that the working medium leaving the screw compressor carries as little lubricant as possible along with it, it is suggested that the sound damping device guide the compressed working medium by means of a flow guide in an interior space as a circulating flow circulating around an axis and that lubricant be separated from the circulating flow of the working medium as a result of centrifugal forces.