Abstract: The piston is provided with a pair of radial holes opened to an external circumferential recess and lodging and retaining one respective end of a pin, to which is coupled a driving mechanism to reciprocate the piston inside a cylinder. The radial holes are completely sealed in order that the axial extension of a bottom radial gap provided by a bottom bearing surface of the piston work together with the axial extension of a top radial gap provided by a top bearing surface to provide the required leakage restriction of the refrigerant gas and also the required bearing of the piston inside the cylinder. The axial extension of each of the top bearing surface and of the bottom bearing surface is insufficient to provide by itself said required leakage restriction of the refrigerant gas.

Abstract: The piston is provided with a pair of radial holes opened to an external circumferential recess and lodging and retaining one respective end of a pin, to which is coupled a driving mechanism to reciprocate the piston inside a cylinder. The radial holes are completely sealed in order that the axial extension of a bottom radial gap provided by a bottom bearing surface of the piston work together with the axial extension of a top radial gap provided by a top bearing surface to provide the required leakage restriction of the refrigerant gas and also the required bearing of the piston inside the cylinder. The axial extension of each of the top bearing surface and of the bottom bearing surface is insufficient to provide by itself said required leakage restriction of the refrigerant gas.

Abstract: A mounting arrangement for the piston of a reciprocating hermetic compressor, comprising: a cylinder (1), inside which is defined a compression chamber (C); and a piston (10) provided with a pair of radial holes (11), each lodging and retaining one end of a pin (20), to which is coupled a driving mechanism of the compressor to reciprocate the piston (10) inside the cylinder (1), said radial holes (11) being completely sealed in relation to the radial gaps (15) of the bearing surfaces (10a, 10b) of the piston (10), so that both radial gaps (15) operate as means for restraining the leakage of refrigerant gas outwardly and inwardly in relation to the compression chamber (C).

Abstract: A hermetic compressor with internal thermal insulation, comprising: a compression cylinder having one end closed by a valve plate provided with a discharge orifice and having a front face against which is mounted a cylinder cover internally defining a discharge chamber; and a spacing duct having one inlet end hermetically mounted to the front face of the valve plate and open to the discharge orifice and an outlet end hermetically mounted to the cylinder cover and open to the interior of the discharge chamber, said spacing duct defining a hermetic fluid communication between the interior of the compression cylinder and the discharge chamber maintaining the cylinder cover spaced from the valve plate and defining, with the latter, an annular plenum around said spacing duct.

Abstract: A suction valve for a small hermetic compressor formed as a flexible vane having a fixed end portion, a bending median portion and a sealing end portion with the distance between the external edge portion of the vane and an internal edge portion of the vane.

Abstract: A hermetic compressor with internal thermal insulation, comprising: a compression cylinder having one end closed by a valve plate provided with a discharge orifice and having a front face against which is mounted a cylinder cover internally defining a discharge chamber; and a spacing duct having one inlet end hermetically mounted to the front face of the valve plate and open to the discharge orifice and an outlet end hermetically mounted to the cylinder cover and open to the interior of the discharge chamber, said spacing duct defining a hermetic fluid communication between the interior of the compression cylinder and the discharge chamber maintaining the cylinder cover spaced from the valve plate and defining, with the latter, an annular plenum around said spacing duct.

Abstract: A suction muffler for a reciprocating hermetic compressor, comprising a hollow body (10) provided with a gas inlet and a gas outlet (12, 14), which are respectively in fluid communication with the gas supply to the compressor and with a suction side thereof, said hollow body (10) defining a plurality of chambers comprising an innermost first acoustic chamber (50) in fluid communication with the gas outlet (14) of the hollow body (10), and a second acoustic chamber (51) surrounding at least partially the first acoustic chamber (50) and in fluid communication with at least one of the parts defined by said first acoustic chamber (50) and by the gas inlet (12) of the hollow body (10).

Abstract: A mounting arrangement for the piston of a reciprocating hermetic compressor, comprising: a cylinder (1), inside which is defined a compression chamber (C); and a piston (10) provided with a pair of radial holes (11), each lodging and retaining one end of a pin (20), to which is coupled a driving mechanism of the compressor to reciprocate the piston (10) inside the cylinder (1), said radial holes (11) being completely sealed in relation to the radial gaps (15) of the bearing surfaces (10a, 10b) of the piston (10), so that both radial gaps (15) operate as means for restraining the leakage of refrigerant gas outwardly and inwardly in relation to the compression chamber (C).

Abstract: A suction muffler for a reciprocating hermetic compressor, comprising a hollow body (10) provided with a gas inlet and a gas outlet (12, 14), which are respectively in fluid communication with the gas supply to the compressor and with a suction side thereof, said hollow body (10) defining a plurality of chambers comprising an innermost first acoustic chamber (50) in fluid communication with the gas outlet (14) of the hollow body (10), and a second acoustic chamber (51) surrounding at least partially the first acoustic chamber (50) and in fluid communication with at least one of the parts defined by said first acoustic chamber (50) and by the gas inlet (12) of the hollow body (10).

Abstract: A hermetically sealed shell (21) contains a reciprocating hermetic compressor that has a suction inlet tube (28) for admitting gas into the shell; a suction orifice (24a) which is provided at the head of a cylinder (22) disposed inside the shell (21) and which is in fluid communication with the suction inlet tube (28). A suction duct (60) has a first end (61) hermetically coupled to the suction inlet tube (28) and a second end (62) hermetically coupled to the compressor suction orifice inlet (24a) and conducts low pressure gas from the suction inlet tube (28) directly to the suction orifice (24a) inside of shell (21), the suction duct (60) providing thermal and acoustic energy insulation to the gas being drawn into the compressor and is dimensioned to produce a load loss reduction in the gas flow from the suction inlet tube (28) to the suction orifice (24a).

Abstract: A section arrangement for a reciprocating hermetic compressor, includes a hermetic shell (21), a suction inlet tube (28) for gas admission and a suction orifice (24a) at the head of a cylinder (22) disposed inside the shell (21) and which is in fluid communication with the suction inlet tube (28). A suction duct (60) has a first end (61) and a second end (62), which are hermetically coupled to the suction inlet tube (28) and suction orifice (24a), respectively, in order to conduct low pressure gas from the suction inlet tube (28) directly to the suction orifice (24a) and to provide thermal and acoustic insulation to the gas flow being drawn. At least one pressure equalizing element (70) provides a predetermined fluid communication of the gas being drawn between the suction inlet tube (28) and the suction orifice (24a) into the shell (21) and maintains the thermal and acoustic insulating characteristics of the suction duct (60) substantially unaltered.

Abstract: A refrigeration system having a compressor with a check valve on the high pressure side to prevent refrigerant migration when the compressor shuts down; the improvement comprising a slot at the discharge valve plate forming an equalizing volume to provide gas leakage to the low pressure side during a stoppage so as to reduce starting torque.