Patent ID: 6540490
Filing Date: 2003-04-01
Classification: F04B

Abstract:
A reciprocating compressor driven by a linear motor, comprising:a hermetic shell (1); a linear motor (2) and a cylinder (3) affixed inside the hermetic shell (1); at least a piston (10) reciprocating inside the cylinder (3) and axially affixed to an end of a rod (30); an actuating means (20) coupling the piston (10) to the linear motor (2); and a resonant spring (70) transversally affixed inside the hermetic shell (1) and axially coupled to the rod (30), characterized in that the rod (30) and the resonant spring (70) each has two contact surfaces (41, 42, 72; 31, 32) lying on orthogonal planes in relation to the axis of cylinder (3) and axially spaced apart, each of said contact 11 surfaces facing a respective confronting contact surface (51, 62; 61,52) a spacing body (50, 60), between each pair of said contact surfaces, which is loosely and coaxially mounted around the rod (30) wherein a gap is formed between the rod and the spacing body (50,60) so dimensioned to absorb the deviations of radial and angular positioning between rod 30 and resonant spring 70 during operation of the compressor and has two of said confronting contact surfaces (51, 52; 61, 62) axially opposite to each other and lying on orthogonal planes in relation to the axis of cylinder (3), whereby each of said confronting contact surfaces is forced to seat against one of said contact surfaces (41, 32; 31, 42, 72) because of the shape of a pair of convex surface portion of said confronting contact surfaces, which are symmetrical and opposite in relation to the axis of cylinder (3), each one of the pair of convex surface portions being operatively associated with the same spacing body (50, 60), with the convex surface portions thereof defining an orthogonal alignment in relation to the other one of the pair of convex surface portions and to the axis of cylinder (3).