Patent ID: 8157545

Claim:
A hermetic compressor comprising: a hermetic container arranged to store lubricating oil; a motor element accommodated in the hermetic container; a compressing element accommodated in the hermetic container, and driven by the motor element, wherein the compressing element includes a shaft rotatable by the motor element to compress refrigerant; an oil-feeding mechanism provided in the shaft to carry the lubricating oil; and a centrifugal pump provided in the shaft and having an end with an opening positionable in the lubricating oil to pump the lubricating oil to the oil-feeding mechanism, wherein the centrifugal pump comprises a cylindrical portion having a hollow which opens at the opening, and an aperture plate having a suction aperture formed therein, the suction aperture having a cross-sectional area smaller than a cross-sectional area of the hollow, wherein the aperture plate has an inner periphery and an outer periphery, the inner periphery of the aperture plate defining the suction aperture, the outer periphery of the aperture plate contacting an inner surface of the cylindrical portion, and the aperture plate is waved in shape so as to curve out away from the cylindrical portion between the inner periphery and the outer periphery of the aperture plate.