CENTRIFUGAL OIL PUMP FOR A VARIABLE SPEED HERMETIC COMPRESSOR

摘要

Centrifugal oil pump for variable speed hermetic compressors, comprising: a hermetic shell (1), which lodges therewithin, a cylinder block (3), supporting a vertical eccentric shaft (5), whereto is mounted the rotor (8) of an electric motor (6), the eccentric shaft (5) being provided with at least one oil channel (9), having a lower end (9b), opened to a lower end (5b) of the eccentric shaft (5), wherein the eccentric shaft-rotor assembly attaches, at its lower part, an upper extension (12) of a pump rotor (10) and a tubular sleeve (20), attached to an inertial portion of the compressor and surrounding at least the portion of said pump rotor (10) external to the rotor (8), said pump rotor (10) presenting a centrifugation region (15), radially extending beyond the edges of the lower end (5b) of the eccentric shaft (5) and having a lower end nozzle (10b) that is permanently immersed in the oil sump (2), which is internally defined at the bottom of the shell (1) and with at least an upper radial nozzle (11b), communicating with at least an oil conducting axial channel (18), which communicates with the lower end of the oil channel (9) through at least one dragging duct (14), which is longitudinally provided through the upper extension (12) of the pump rotor (10).