Abstract: Arrangement for cooling a compressor comprising a housing (Ia, Ib) with an inlet (13) and an outlet (14) and enclosing in its volume (12) a stator including stator winding (2) and stator iron (3) of an electric motor, which drives a rotor (9) with a shaft (6). The invention is characterized in that the volume (12) is arranged separated from the rotating parts (9, 6) in a sealed manner.

Abstract: Compressor comprising a housing (1a, 1b) and with at least one partly electric-motor-driven impeller (3) arranged on a central shaft (5). The invention is characterized in that the impeller (3) is provided with a tubular part (6) surrounding the central shaft (5), and also in that a tubular carrier (2) extending in between the central shaft (5) and the tubular part (6) is arranged firmly on the housing, in which carrier (2) the central shaft (5) is rotatably mounted.

Abstract: A method for withdrawing liquid from the liquid bearings of a spindle (1) carried in liquid bearings (3, 5) distinguished in that with the help of pressurized gas, the liquid, together with the gas, is forced to exit the spindle during the operation of the spindle via at least one first channel (12), and that when the spindle is shut down, is forced to exit via at least one second channel (13) with a smaller flow-through cross-section than the first channel.

Abstract: In a method for a safety valve plus such a safety valve, the safety valve has the form of a valve body axially displaceable in a cavity with an inlet on either side of which are arranged outlets, whereby liquid and/or gas flow takes place from the inlet and past the valve body via a flow path to the outlets. On the valve body side, the flow path is provided with a structure that raises the friction in relation to the liquid and/or gas flow between the inlet and outlets.

Abstract: Arrangement for a tool spindle equipped with a rotor (22) of an electric driving motor (32). It is distinguished in that the rotating part (1, 3) of the tool spindle is accommodated in a unit (4) that is stationary in relation to the rotating part, that the rotating part (1, 3) has at least one axial channel (12a, 12b or 12d) extending to the area for the rotor (22) for leading cooling fluid to the area (20a, 26), that the stationary unit (4) is provided with an inlet (16, 14 or 25) for leading cooling fluid to the channel (12a, 12b or 12d), that a gap sealing is arranged on either side of the inlet (16, 14, 25) between the stationary unit (4) and the rotating part (1, 3) and forms a dynamic bearing during the rotation of this, and that a channel is arranged to lead away the coolant fluid.

Abstract: Arrangement for delivering coolant fluid to the rotating part (1,3) of a tool spindle intended to support a tool at one end. It is distinguished in that the end of the rotating part (1,3) that is opposite the tool is accommodated in a unit (4) that is stationary in relation to the rotating part (1,3), that the rotating part has an axial bore (6) of the rotating part (1,3), that a gap sealing separates the rotating part (1,3) from the stationary unit (4) adjacent to the inlet thereby forming a dynamic bearing during the rotation of the rotating part due to leakage of the coolant fluid through the gap sealing.

Abstract: Tool spindle with a moveable pulling rod (3) axially displaceable in the spindle axle (1) for firmly attaching a tool at the axle of the spindle. The end (10) of the pulling rod (3) that is opposite to the tool extends into a unit (4) that accommodates the end of the pulling rod and that is stationary in relation to the rotation of the pulling rod, that the pulling rod (3) is provided with a piston (11) accommodated in a cylinder chamber (13) arranged in the spindle axle (1) and having at least a first (12b) and a second (12a) axial bore of which the first bore (12b) opens in the cylinder chamber (13) on one side of the piston (11) and the second bore (12a) opens in the cylinder chamber (13) on the other side of the piston (11).

Abstract: Supply unit for a tool spindle wholly or partially equipped with a moveable pulling rod (3) axially displaceable in the spindle axle (1) for firmly attaching the tool with a fluid supply system for displacing the pulling rod (3), with a fluid supply system for cooling a rotor (22) of a driving source supported on the spindle axle for driving the spindle axle, a fluid supply system for cooling the tool, and a gas supply system for blocking fluid leakage in gaps between parts that move in relation to one another. The supply unit includes, for one or more of the said systems, at least one sensor that senses if a malfunction exists in the fluid and/or gas supply system, and, for one or more of the said systems, an accumulator (704, 164, 243) that from indicated malfunction signals obtained from one or more sensors feeds into the system or systems complementary and replacement fluid respectively gas to the tool spindle at the same time as the sensor or sensors deactivate the driving source of the spindle axle.

Abstract: Arrangement for a tool spindle with a pulling rod (3) axially displaceable in the spindle axle (1) for firmly attaching a tool at the spindle of the tool whereby the end of the pulling rod (3) that is opposite to the tool is accommodated in a stationary unit (4), the rotating part (1, 3) is provided with a piston (11) movably displaceable in a cylinder chamber (13) arranged in the spindle axle (1), the pulling rod (3) has at least one first axial bore (12a) opening into the cylinder chamber on one side of the piston (11) and at least one second (12b) axial bore opening into the cylinder chamber on the other side of the piston (11), the stationary unit (4) is provided with an inlet (16) in communication with the first bore (12a) and an inlet (14) in communication with the second bore (12 b).

Abstract: Tool spindle with a moveable pulling rod (3) axially displaceable in the spindle axle (1) for firmly attaching a toot at the axle of the spindle. The end (10) of the pulling rod (3) that is opposite to the tool extends into a unit (4) that accommodates the end of the pulling rod and that is stationary in relation to the rotating pulling rod, in which there is a spool (9) surrounding the pulling rod (3) for sensing the axial position of this in the spindle axle (1), the pulling rod is provided with an axial, central hole (6) for leading a coolant agent under pressure to the bit of the tool, whereby the coolant is supplied to the bore (6) of the pulling rod (3) via the stationary unit, that the pulling rod (3) is provided with a piston (11) accommodated in a cylinder chamber (13).

Abstract: Arrangement for a tool spindle with a moveable pulling rod (3) axially displaceable in the spindle axle (1) for firmly attaching the tool. The pulling rod is surrounded by at least one spool (9) that is stationary in relation to the axial displacement of the pulling rod (3) which gives a specific current flow that differs depending on the axial position of the pulling rod (3) in the spool (9), whereby the rotating part (1, 3) of the tool spindle in the form of the spindle axle (1) or the end part (10) of the pulling rod (3) that projects out from this, is accommodated in a stationary unit (4) that is at the end of the tool spindle opposite to the tool and which has an axial bore (6), that the stationary unit (4) is provided with an inlet for introducing coolant fluid under pressure to the bore (6) and that a gap sealing is arranged between the rotating part (1, 3) and the stationary unit (4) adjacent to the inlet to allow leakage of fluid through the gap sealing.