Abstract: A mounting arrangement for a hermetic compressor, comprising a shell (10) formed of a metallic plate and incorporating tubular projections (12) with the upper end (12a) opened to the inside of the shell (10) and with the lower end (12b) closed, fitted and tightly retained, by mechanical deformation of the parts, inside a drawn recess (22) of a respective basic plate (20) to be affixed under the shell (10).

Abstract: A reciporcating compressor with a linear motor, comprising a pair of pistons (4) provided inside a cylinder (3) and axially aligned to each other, at least one of said pistons (4) being provided with a discharge valve (10) for controlling the discharge of the gas admitted inside the cylinder (3) through said piston (4).

Abstract: A reciprocating compressor includes a linear motor having a piston reciprocating inside a cylinder. A cylinder head is provided with suction and discharge orifices. A valve means is mounted inside the cylinder and has an operative position, seated against the discharge orifice. The operative position is defined when the top of the piston is within a certain distance from the cylinder head. The distance is defined, so that, at the end of the compression stroke of the piston, a determined pressure is reached inside the cylinder, and the pressure results in a force on the piston. The force is opposite to a force which is impelling the piston and which is sufficient to interrupt its compression stroke before impacting the cylinder head.

Abstract: A resonant assembly for a reciprocating compressor driven by a linear motor. The compressor includes a piston (2), driven by an actuator (3), which reciprocates inside a cylinder (1a) provided with an end closed by a head. The assembly comprises a resonant element, defining by a single piece, a rod portion (11) and a spring portion (12). The spring portion is affixed to a non-resonant structure (1) of the compressor at a plurality of points which are symmetric in relation to the longitudinal axis of the cylinder and lie on a plane orthogonal to the longitudinal axis of the cylinder.

Abstract: A connecting rod-piston mounting arrangement for a reciprocating compressor of small refrigeration systems, in which one of the parts defined by the piston (10) and the end (22) of the connecting rod (20) adjacent the said piston (10) carries a first spherical seat (11) and a spherical annular seat (12), the other of said parts incorporating a second spherical seat (23) turned to the first spherical seat (11) and a spherical annular surface (24) seated against the spherical annular seat (12), said first and second spherical seats (11,23) being seated onto respective opposite spherical surface portions (31,32) of a ball joint element (30) provided between the piston (10) and the connecting rod (20).

Abstract: A sealed unit of refrigerant fluid for a refrigeration appliance, comprising a hermetic compressor (1), a condenser (3), an evaporator (2), an expanding device, and conducting tube (4) of refrigerant fluid, at least one of the parts consisting of the condenser (3) and the evaporator (2) being defined as a prismatic body which is at least partially tubular, the component parts of the sealed unit being relatively displaced from an inoperative position of transportation, in which the hermetic compressor (1) and the conducting tubes (4) remain contained within a contour defined by the contour of at least one of the parts consisting of the condenser (3) and the evaporator (2), to a mounting operative position in a refrigeration appliance.

Abstract: A two-piece connecting rod for a reciprocating compressor and method for assembling a two-piece connecting rod, said connecting rod comprising an engaging portion (21), which is provided in one of the parts defined by a first connecting rod portion (10), to be mounted to the eccentric (6) of a crankshaft (4) of the compressor, and by a second connecting rod portion (20), to be articulated to a piston (8) reciprocating inside a cylinder (7), which is closed by a cylinder head (9); and a guide portion (11) provided in the other of said parts, to be slidingly coupled with the engaging portion (21); and a fixation means, applied to the coupling region between the engaging portion (21) and the guide portion (11), with the first connecting rod portion (10) being mounted to the eccentric (6) and with the second connecting rod portion (20) being mounted to the piston (8) lodged in the cylinder (7), in order to lock said portions against relative displacements in a position which results in a predetermined axial dista

Abstract: A resonant spring is transversally affixed inside a hermetic shell of a reciprocating compressor and axially coupled to a linear motor's drive rod. Two contact surfaces, defined by the drive rod and by the resonant spring, are located on orthogonal planes in relation to a cylinder's axis and are axially spaced from each other facing a respective confronting contact surface. A spacing body located between each of the confronting surfaces is loosely and coaxially mounted around the rod and has two axially opposite contact surfaces lying on orthogonal planes in relation to the cylinder's axis.

Abstract: A suction muffler for a hermetic compressor, comprising a hollow body (10,20) provided with gas inlet and gas outlet nozzles (12,22) and, internally, with a plurality of chambers (C1, C2, C3) and a duct (T) having an end connected with and opened to the gas inlet nozzle (12), median windows (45,55), which are longitudinally spaced from each other and opened to respective chambers (C1, C2), and an opposite end opened to a last chamber (C3), which is maintained opened to the gas outlet nozzle (22). The last chamber (C3) is partially divided in two volumes with different shapes and dimensions, the opposite end of the duct (T) projecting to the inside of the last chamber (C3), both the gas outlet nozzle (22) and the opposite end of the duct (T) being opened to the larger volume of the last chamber (C3).

Abstract: A starting system for an electric motor having a main coil and an auxiliary coil which are supplied current by an electric current source in which a switch is connected between the electric current source and the auxiliary coil that has an open condition, in which the auxiliary coil remains de-energized by the electric current, and a closed condition for energization of the auxiliary coil with the electric current. An actuating system is positioned relative to the electric motor to receive the magnetic field produced by the motor main coil upon its energization by the electric current for operation of the electric motor that operates to close the switch in response to the magnetic field produced by the current passing through the motor main coil with an intensity above a determined minimum value, and opens the switch when the current through the main coil produces a magnetic field having an intensity of the determined minimum value.

Abstract: An improvement in a starting system for an electric motor, which drives a hermetic compressor of refrigeration and comprises a main winding (1), and an auxiliary winding (2), which are energized by an electric current source (3), through a hermetic terminal (40) affixed to the outside of the compressor shell, the auxiliary winding (2) having a terminal connected to the electric current source (3) through a starting device (10) mounted inside the compressor shell and in series with a fusible element (20) to be opened when submitted to an electric current, in order to definitively interrupt the energization of the auxiliary winding (2) by means of the starting device (10), said hermetic terminal (40) being designed to receive an external starting device (50), in order to promote the selective connection between said other terminal of the auxiliary winding (2) and the electric current source (3) upon the definitive opening of the circuit defined by the fusible element (20) and the starting device (10).

Abstract: A mounting arrangement for a hermetic compressor, comprising a shell (10) formed of a metallic plate and incorporating tubular projections (12) with the upper end (12a) opened to the inside of the shell (10) and with the lower end (12b) closed, fitted and tightly retained, by mechanical deformation of the parts, inside a drawn recess (22) of a respective basic plate (20) to be affixed under the shell (10).

Abstract: A method of producing the core of an electric motor by providing a stack of laminations of magnetic material. Windows are formed in the laminations for one or more magnetic elements to be placed in each window. Each window has an end edge portion (17) which is to be at the peripheral edge (18) of the lamination of the finished version of the rotor. The laminations originally have an annular radial extension (60-61) and after the core is assembled with end caps, the annular radial extension (60-61) is removed so that the window end edge portions (17) are at the periphery (18) of the laminations. There is a polar peripheral portion (20) between each window and the periphery (18) of the lamination and an intermediate peripheral portion (40) between two adjacent polar peripheral portions, with such intermediate polar portions having reduced electrical conductibility and reduced magnetic permeability.

Abstract: A suction muffler for a hermetic compressor, comprising a hollow body (10,20) provided with gas inlet and gas outlet nozzles (12,22) and, internally, with a plurality of chambers (C1, C2, C3) and a duct (T) having an end connected with and opened to the gas inlet nozzle (12), median windows (45,55), which are longitudinally spaced from each other and opened to respective chambers (C1, C2), and an opposite end opened to a last chamber (C3), which is maintained opened to the gas outlet nozzle (22). The last chamber (C3) is partially divided in two volumes with different shapes and dimensions, the opposite end of the duct (T) projecting to the inside of the last chamber (C3), both the gas outlet nozzle (22) and the opposite end of the duct (T) being opened to the larger volume of the last chamber (C3).

Abstract: The present invention refers to a new construction for the evaporation tray for the defrost water in refrigeration systems of refrigerators and freezers and, more especifically, to a new construction for the evaporation tray of the type which is affixed onto the shell of the hermetic compressor of said refrigeration systems.

Abstract: A process for magnetizing the permanent magnets of an electric motor rotor and a process for assembling a hermetic compressor motor, whose stator (30) carries a plurality of coils (40), said rotor being operationally positioned with a determined relative angular position in relation to the stator (30) prior to the energization, from an external current source, of a determined number of coils (40) of said stator (30) with a current pulse having a required intensity to generate a magnetic field which produces a homogeneous magnetization transversely oriented in at least one magnetic sector, said current pulse being maintained during a shorter time than that which impairs the coils of said stator (30).

Abstract: An improvement in a starting system for an electric motor, which drives a hermetic compressor of refrigeration and comprises a main winding (1), and an auxiliary winding (2), which are energized by an electric current source (3), through a hermetic terminal (40) affixed to the outside of the compressor shell, the auxiliary winding (2) having a terminal connected to the electric current source (3) through a starting device (10) mounted inside the compressor shell and in series with a fusible element (20) to be opened when submitted to an electric current, in order to definitively interrupt the energization of the auxiliary winding (2) by means of the starting device (10), said hermetic terminal (40) being designed to receive an external starting device (50), in order to promote the selective connection between said other terminal of the auxiliary winding (2) and the electric current source (3) upon the definitive opening of the circuit defined by the fusible element (20) and the starting device (10).

Abstract: A reciprocating compressor with a linear motor, having a piston (1) reciprocating inside a cylinder (2); a cylinder head (5) provided with suction and discharge orifices (5a, 5b), and a valve means (10) mounted inside the cylinder (2) and having an operative position, seated against the discharge orifice (5b), defined when the top of the piston (1) is within a certain distance (D) from the cylinder head (5), said distance being defined, so that, at the end of the compression stroke of the piston (1), be reached inside the cylinder (2) a determined pressure that will result in a force on the piston (1) opposite to that force which is impelling said piston (1) and which is sufficient to interrupt its compression stroke before impacting the cylinder head (5).

Abstract: A driving control system for electric motors, of the type used in refrigeration compressors and including: a power source (20) in direct current having, between positive (21) and negative (22) terminals of equal voltage, a median terminal (25), of null voltage, to which is directly connected a first coil (11) of the electric motor (10); an inverter (30) provided with N−1 commutation arms with opposite ends connected to the power source (20) and each including switch means, each commutation arm being medianly connected to a respective coil; and a control unit (40) operating the switch means, as a function of the signals received from a position sensor means (50), in order to determine to said switch means, in each of a first and a second switching condition thereof, a switching frequency and a switch conduction period, which are defined in order to be effectively applied to the coils a voltage effectively corresponding to the speed and torque required for the motor.

Abstract: An electric motor rotor with permanent magnets, the rotor including magnets (20) seated against a cylindrical lateral surface (11) of the core (10) of the rotor and a pair of annular caps (40), each cap being seated and affixed to an adjacent end face (12) of the core (10), the annular caps (40) limiting axial displacements of the magnets and defining, for both directions of circumferential displacement, stops for this displacement for each magnet (20), the confronting lateral edges (21) of a pair of consecutive magnets (20) being positioned by the annular caps (40), in order to define a previously established minimum circumferential distance.