Abstract: A device and a method for converting low temperature thermal energy into high temperature thermal energy using mechanical energy with a rotor for a working medium passing through a closed cycle. The rotor has a compressor unit with compression channels and an expansion unit with expansion channels, and has heat exchangers for exchanging heat between the working medium and a heat exchange medium. The device has an impeller which can be rotated relative to the rotor. The impeller is arranged between supply channels which conduct the flow of the working medium in the heat pump and at least one rotor discharge channel which discharges the flow of the working medium in the heat pump. The supply channels have outlet sections which extend up to a point directly upstream of an inlet opening of the impeller such that flows of the working medium are conducted out of the supply channels.

Abstract: The invention relates to a device for converting thermal energy of a low temperature into thermal energy of a high temperature by means of mechanical energy, and vice versa, comprising a rotor which is mounted so as to rotate about a rotational axis and in which a flow channel is provided for a working medium that circulates in a closed circuit process, said medium being conducted outwards, relative to the rotational axis, in a compression unit in order to increase pressure, and being conducted inwards, relative to the rotational axis, in an expansion unit in order to reduce pressure. At least one heat exchanger is provided for exchanging heat between said working medium and a heat exchange medium.

Abstract: The invention relates to a device (1) and a method for converting thermal energy of low temperature to thermal energy of high temperature by means of mechanical energy and vice versa, said device comprising a rotor (2) that is rotatably supported about a rotational axis (3), a flow channel for a working medium that runs through a closed cycle being provided in the rotor, wherein the flow channel has a compression channel (8), a relaxation channel (10), and two connection channels (9, 11) extending substantially parallel to the rotational axis (3), and furthermore heat exchangers (13, 14) for exchanging heat between the working medium and a heat-exchange medium are provided, wherein the compression channel (8) and the relaxation channel (10) have a heat-exchange segment (8?, 10?), each of which has a heat exchanger (13, 14) that rotates together with the compression channel (8) or the relaxation channel (10) associated therewith, said heat exchanger being formed by at least one heat-exchange channel (15, 18) t

Abstract: A device and a method for converting low temperature thermal energy into high temperature thermal energy using mechanical energy with a rotor for a working medium passing through a closed cycle. The rotor has a compressor unit with compression channels and an expansion unit with expansion channels, and has heat exchangers for exchanging heat between the working medium and a heat exchange medium. The device has an impeller which can be rotated relative to the rotor. The impeller is arranged between supply channels 9 which conduct the flow of the working medium in the heat pump and at least one rotor discharge channel which discharges the flow of the working medium in the heat pump. The supply channels have outlet sections which extend up to a point directly upstream of an inlet opening of the impeller such that flows of the working medium are conducted out of the supply channels.

Abstract: A device for converting low temperature thermal energy to high temperature thermal energy by means of mechanical energy, and vice versa, comprising a rotor mounted to rotate about a rotational axis, and in which a flow channel is provided for a working medium that circulates in a closed circuit process, the medium conducted outwards, relative to the rotational axis, in a compression unit to increase pressure, and conducted inwards, relative to the rotational axis, in an expansion unit to reduce pressure. At least one heat exchanger is positioned inwardly relative to the rotational axis and at least one heat exchanger is positioned outwardly relative to the rotational axis for exchanging heat between the working medium and a heat exchange medium, said heat exchangers being arranged parallel to the rotational axis of the rotor, and the rotor comprising a support element to support the heat exchanger(s) along the length.

Abstract: An electromagnet having a pole tube, and having a coil that encompasses the pole tube and is mounted so as to be displaceable along a longitudinal axis of the pole tube, a first end face of the coil or of the housing thereof bearing on a first counter-bearing disposed at a first end portion of the pole tube, and an elastic element, which is supported on a second counter-bearing and biases the coil and/or the housing thereof against the first counter-bearing, is provided between a second end face of the coil or the housing thereof and the second counter-bearing disposed at a second end portion of the pole tube.

Abstract: The invention relates to a device (1) and a method for converting thermal energy of low temperature to thermal energy of high temperature by means of mechanical energy and vice versa, said device comprising a rotor (2) that is rotatably supported about a rotational axis (3), a flow channel for a working medium that runs through a closed cycle being provided in the rotor, wherein the flow channel has a compression channel (8), a relaxation channel (10), and two connection channels (9, 11) extending substantially parallel to the rotational axis (3), and furthermore heat exchangers (13, 14) for exchanging heat between the working medium and a heat-exchange medium are provided, wherein the compression channel (8) and the relaxation channel (10) have a heat-exchange segment (8?, 10?), each of which has a heat exchanger (13, 14) that rotates together with the compression channel (8) or the relaxation channel (10) associated therewith, said heat exchanger being formed by at least one heat-exchange channel (15, 18) t

Abstract: Method for converting thermal energy at a low temperature into thermal energy at a relatively high temperature by means of mechanical energy, and vice versa, with a working medium which runs through a closed thermodynamic circulation process, wherein the circulation process has the following working steps: —reversible adiabatic compression of the working medium, —isobaric conduction away of heat from the working medium, —reversible adiabatic relaxing of the working medium, —isobaric supply of heat to the working medium, and wherein the increase or decrease in pressure of the working medium is produced during the compression or relaxing, increasing or decreasing the centrifugal force acting on the working medium, with the result that the flow energy of the working medium is essentially retained during the compression or relaxing process.

Abstract: An electromagnet having a pole tube, and having a coil that encompasses the pole tube and is mounted so as to be displaceable along a longitudinal axis of the pole tube, a first end face of the coil or of the housing thereof bearing on a first counter-bearing disposed at a first end portion of the pole tube, and an elastic element, which is supported on a second counter-bearing and biases the coil and/or the housing thereof against the first counter-bearing, is provided between a second end face of the coil or the housing thereof and the second counter-bearing disposed at a second end portion of the pole tube.

Abstract: Method for converting thermal energy at a low temperature into thermal energy at a relatively high temperature by means of mechanical energy, and vice versa, with a working medium which runs through a closed thermodynamic circulation process, wherein the circulation process has the following working steps:—reversible adiabatic compression of the working medium, —isobaric conduction away of heat from the working medium,—reversible adiabatic relaxing of the working medium,—isobaric supply of heat to the working medium, and wherein the increase or decrease in pressure of the working medium is produced during the compression or relaxing, increasing or decreasing the centrifugal force acting on the working medium, with the result that the flow energy of the working medium is essentially retained during the compression or relaxing process.

Abstract: The invention concerns a pressure cutoff valve unit (34) with a shuttle valve (36), which has a first input connection (39) and a second input connection (40), which it is possible to connect to an output depending on the pressures at the input connections (39, 40). The shuttle valve (36) has a shuttle valve closing element (45?), which in a first end position connects the first input connection (39) to the output and in a second end position connects the second input connection (40) to the output. The shuttle valve closing element (45?) can be locked in a position between the two end positions, and in this locked position the first input connection (39) is connected to the second input connection (40).

Abstract: The invention relates to an electromagnet for actuating a valve. To this end, the electromagnet (28) comprises an armature (58), which can be axially displaced in an armature space (57, 77) and whose axial motion displaces a tappet (29) to the valve. The electromagnet is provided with reflux channel (71.1), which is connected to the armature space (57, 77) and via which the armature space (57, 77) is connected to a tank volume (25) in order to lead away a pressure medium leakage flow that is flowing out of the valve and into the armature space (57, 77).

Abstract: The invention relates to an electromagnet for actuating a valve. To this end, the electromagnet (28) comprises an armature (58), which can be axially displaced in an armature space (57, 77) and whose axial motion displaces a tappet (29) to the valve. The electromagnet is provided with reflux channel (71.1), which is connected to the armature space (57, 77) and via which the armature space (57, 77) is connected to a tank volume (25) in order to lead away a pressure medium leakage flow that is flowing out of the valve and into the armature space (57, 77).

Abstract: A pressure-control valve (1) comprises a first control piston (1), which is disposed between a first pressure chamber (6), which adjoins the first control piston (1) and is connected to at least one working line (A, B), and a second pressure chamber (7), which adjoins the first control piston (1) and is pushed against a stop (3) by a first preloading spring (4). A throttle (8) connects the first pressure chamber (6) and the second pressure chamber (7). The second pressure chamber (7) is connected to a second control piston (11), which is preloaded by a second preloading spring (17) and which, when a predetermined pressure in the second pressure chamber (7) is exceeded, is displaced to an extent such that a control edge (12) of the second control piston (11) clears a connection of the second pressure chamber (7) to a hydraulic fluid discharge point (23).

Abstract: A pressure-control valve (1) comprises a first control piston (1), which is disposed between a first pressure chamber (6), which adjoins the first control piston (1) and is connected to at least one working line (A, B), and a second pressure chamber (7), which adjoins the first control piston (1) and is pushed against a stop (3) by a first preloading spring (4). A throttle (8) connects the first pressure chamber (6) and the second pressure chamber (7). The second pressure chamber (7) is connected to a second control piston (11), which is preloaded by a second preloading spring (17) and which, when a predetermined pressure in the second pressure chamber (7) is exceeded, is displaced to an extent such that a control edge (12) of the second control piston (11) clears a connection of the second pressure chamber (7) to a hydraulic fluid discharge point (23).

Abstract: A control circuit, in particular for a slewing gear of a digger, has a hydraulic fluid tank (21), connected to two adjusting pressure chambers (10, 11). Each of the connections contains a separate brake valve (19, 20). The first of the valves (19) is operated by the differential between the working pressure in the first working conduit (2), and the control pressure in the control conduit (33, 34) charged with the higher pressure. The second valve (20) is operated by the differential between the working pressure in the second working circuit (3) and the control pressure in the control circuit charged with the higher pressure. Slow braking by the brake valves is interrupted when the slewing gear swings out against a resistance such as a heap of debris.

Abstract: The invention relates to a hydraulic controller (1), in particular for the control of the rotating mechanism of an excavator. A hydraulic motor (5) is driven by means of a hydraulic pump (2) in a hydraulic drive circuit, the hydraulic pump (2) and the hydraulic motor (5) being connected by a first and a second working line (3, 4). The hydraulic controller (1) includes an adjustment arrangement (26) for adjusting a setting piston (28a), acting on the displacement volume of the hydraulic pump (2), arranged between two setting pressure chambers (26, 27), in dependence upon the pressure difference between two control lines (20, 21). In accordance with the invention, a respective separate brake valve (24; 25) is provided in each connection between each of the two setting pressure chambers (26; 27) with the pressure fluid tank (10).

Abstract: In a connecting module for the transmission of electrical energy and/or information signals between a patient support means of an operating table and a supporting apparatus releasably connectable with the patient support means, including a support apparatus module portion (42) and a patient support means module portion (44), one of the module portions (42,44) is provided with a first group of transmission elements (88,98) for the transmission of electrical energy and/or information signals and a second and a third group of complementary transmission elements (60,72) are provided in the other module portion (44,42) and are so arranged that upon connection of the patient support means with the support apparatus in a first position of the patient support means relative to the support apparatus the transmission elements (88,98) of the first group cooperate with the transmission elements (60,72) of the second group and so that in a second position of the patient support means relative to the support apparatus, whi

Abstract: A method of manufacturing a piston for hydrostatic axial and radial piston machines by non-machining forming, by filling a material that is in a substantially unresistant, formable state into a mold defining a piston outer contour which is closed on all sides, in which at least one supporting core is arranged spaced from the inner contour of the mold to remain in the completed piston to define a core region in the interior of the piston that is closed on all sides, then solidifying the material forming a piston with high strength characteristics and low weight, and removing the completed piston with the enclosed supporting core.

Abstract: A piston for axial piston machines in the form of a hollow body with an axial cavity therein into which an insert is inserted and is secured axially by means of a collar in the wall of the hollow body surrounding the insert overlapping its outer end face is designed so that while ensuring simple and economical manufacture, stable support of the filler piece and a stability of the shaft of the piston is obtained. This is achieved by providing the collar by pressing the wall of the hollow body, which is longer than its final length, into a plurality of oppositely disposed recesses or into an annular recess in the insert and by cutting the piston formed in this way to length in the general region of the recesses or the annular recess.