Abstract: The present invention refers to a linear compressor comprising a piston (9) arranged slidably inside a cylinder (15); in said cylinder (15) the 15 piston (9) defines a first low-pressure chamber (21) and a second high-pressure chamber (22), said piston being further provided with communication means (23) between said first and said second chamber (21, 22), which are controlled by valve means (24) to establish such communication therebetween.

Abstract: A muffler for motor compressors for refrigeration appliances consisting of at least three expansion chambers interconnected by passages which are narrower than the chambers; a tube is located in one of said chambers and fastened to the outlet and inlet ports of said chamber. This tube is provided with openings to let the refrigerant gas flow through and for attenuating the resonance frequency of that gas. The diameter of the openings is inversely proportional to the number of openings.

Abstract: A sealed motor-compressor unit having a suction side muffler directly attached to the cylinder head by a niche in the cylinder head which receives the muffler. A "U" shaped spring has two legs contacting sidewalls of the niche and a bight portion which contacts and biases the muffler.

Abstract: A hermetic motor compressor comprising a shell formed by an upper and a lower cap connected one to the other in such a way that an airtight closure is obtained in the shell, and by feet fixed to the lower cap for positioning the shell in the correct position during its working, the lower cap defining lower cap lateral surfaces having a very large curvature radius connected to first, second, third and fourth curved surfaces. First and second curved surfaces being connected to a lateral plane and third and fourth curved surfaces being connected one to the other, the lower cap defining a sphere-shape in a lower part thereof and a band in the upper part thereof which is joined to the upper cap.