Lubricating device for a turbomachine

A lubricating device for a turbomachine comprising

• a central rotor shaft;
• a main oil pump mechanically connected to the central rotor shaft and having an input port and an output port;
• a suction line connected to the input port of the main oil pump;
• a main supply line;
• a discharge line connected to the output port of the main oil pump;
• a connection line with a pressure regulator connected to the main supply line and to the suction line of the main oil pump, which are provided for the balancing of the leakage losses and for removal of the heat fed to the oil by a occurring friction load output;
• an oil container;
• a hydraulically-driven oil pump unit including:
• a motor of the oil pump unit disposed in the region of the oil container, where the motor of the oil pump unit is connected to the discharge line connected to the main oil pump, and where the motor of the oil pump unit is driven by the oil flowing out of the discharge line;
• a pump of the oil pump unit disposed in the region of the oil container, where the pump is mechanically connected to and driven by the motor, where the pump withdraws oil from the oil container, and where the pump pumps oil into the main supply line for supplying consumer points;
• where the main oil pump and the motor of the oil pump unit, the output port of the oil pump unit connected to the suction line of the main oil pump, together with the discharge line, are forming a closed hydraulic circuit placed under pressure with a fluid.

A method of lubricating a turbomachine comprising

• pulling oil with an auxiliary pump from an oil container, disposed close by a turbomachine, for filling a main supply line, and where the auxiliary pump is driven separately from the rotation motion of the turbomachine by a drive prior to start-up of the turbomachine;
• filling lubrication points of a turbomachine with oil from the main supply line pumped by the auxiliary oil pump;
• driving a pump unit with a hydraulic gear motor connected by a discharge line to a main gear pump, said main gear pump being driven by the turbomachine and feeding oil to the hydraulic gear motor for generating pressure in the discharge line immediately upon start-up of the turbomachine for immediately driving the pump unit and for immediately feeding lubricant to lubrication points of the turbomachine;
• and feeding oil from said main supply line directly to said main gear pump via a pressure regulator so that oil added to said discharge line flows through said main gear pump before the oil reaches said pump unit.