Mounting arrangement for an oil pump in a refrigeration compressor

摘要

The refrigeration compressor includes a cylinder block carrying a crankshaft and a stator of an electric motor, whose rotor is mounted to the crankshaft. An oil pump including: a tubular sleeve affixed to the crankshaft or to the rotor with a pump body internal to the tubular sleeve and connected to the cylinder block. A fixation rod is articulated to the cylinder block or stator and has a lower portion angularly and freely displaced orthogonally to the rotational axis and around which the lower end portion of the pump body is axially retained and slidably mounted, orthogonally and coplanar to the rotation axis of the rotor.

主权项

1. A refrigeration compressor which comprises a shell containing lubricant oil and carrying a cylinder block journalling a crankshaft;
an electric motor having a stator affixed to the cylinder block and a rotor mounted around the crankshaft; an oil pump coupled to the crankshaft and having: a tubular sleeve having an upper tubular portion affixed to one of the parts of the crankshaft and the rotor; and a pump body disposed in the interior of the tubular sleeve and having a lower end portion carried by an assembly defined by the cylinder block and stator, so as to be freely displaced in the interior of the tubular sleeve in radial directions orthogonal to the rotation axis of the rotor and rotatively locked in relation to the rotor, and a tubular connector mounting and retaining the tubular sleeve by one of the parts of the rotor and the crankshaft, where the upper tubular portion of the tubular sleeve is provided with a circumferential groove inside which the tubular connector is fitted and rotatively and axially retained, and in which the rotor is provided with a central axial hole having a lower extension not occupied by the crankshaft, characterized in that the tubular connector is a metallic connector which presents an outer circumferential face radially projecting beyond the contour of the tubular sleeve and which is fitted and retained in the interior of the lower extension of the central axial hole of the rotor.