Abstract: A liquid-injected compressor or vacuum pump device with a liquid-injected compressor or vacuum pump element (2), which includes a liquid return system (7), a motor (4) to drive the compressor or vacuum pumping element (2), a gearbox (3) provided between the motor (4) and the liquid-injected compressor or vacuum pump element (2), and a liquid separator vessel (5) in fluid connection with an outlet (6) of the compressor or vacuum pump element (2). The liquid return system (7) includes a main body (8) with a chamber in which a first compressed gas flow (11) from the liquid separator vessel (5) and a second fluid flow (15) from the gearbox (3) are mixed together to form a third fluid flow (20). The third fluid flow (20) leaves the chamber via an outlet (16) and is directed into the liquid-injected compressor or vacuum pump element (2) via the injection point (17).

Abstract: Compressor device provided with: a compressor element (2) with an inlet (5) for supplying gas and an outlet (6) for discharging compressed gas, a magnet-assisted motor (3) provided with a motor housing (10) in which a motor stator (11) is installed and a motor rotor (12) is rotatably installed in the motor stator (11), wherein the motor stator (11) is provided with windings (13) and wherein the motor housing (10) is provided with or acts as a cooling jacket (17); an oil supply line (18) for injecting oil into the magnet-assisted motor (3); characterized in that the oil supply line (18) is connected with one or several nozzles (22) directed at heads or axial ends (15) of the windings (13) of the motor stator (11) and with the cooling jacket (17) of the magnet-assisted motor (3) and that heads or axial ends (15) of the windings (13) are covered with a protective layer (16).

Abstract: A liquid-injected compressor or vacuum pump device with a liquid-injected compressor or vacuum pump element (2),which includes a liquid return system (7), a motor (4) to drive the compressor or vacuum pumping element (2), a gearbox (3) provided between the motor (4) and the liquid-injected compressor or vacuum pump element (2), and a liquid separator vessel (5) in fluid connection with an outlet (6) of the compressor or vacuum pump element (2). The liquid return system (7) includes a main body (8) with a chamber in which a first compressed gas flow (11) from the liquid separator vessel (5) and a second fluid flow (15) from the gearbox (3) are mixed together to form a third fluid flow (20). The third fluid flow (20) leaves the chamber via an outlet (16) and is directed into the liquid-injected compressor or vacuum pump element (2) via the injection point (17).