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 wound cover arrangement for an electric motor rotor, said rotor including a core (20), magnets (30) surrounding said core and a cover (10), which is wound around the core, in order to retain said magnets (30) on said core, said arrangement comprising a pair of mold end elements (40), each mounted to an end face portion of the rotor core (20) and to the adjacent end face of at least one of the parts defined by the cover (10) and magnets (30), and which has a peripheral edge portion (41) provided with at least one recess (43) extending towards the rotor axis, the distance between said rotor and the bottom of said recess (43) defining the smallest winding end radius of the cover.

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 device for mounting the shaft to the rotor of an electric motor, comprising the steps of: positioning a cylinder block (3) and a rotor (7) relative to each other with a predetermined axial spacing therebetween and with the axes of a bearing bore of the cylinder block (3) and of a central bore of rotor (7) being aligned to each other inside a hermetic chamber (10) having an atmosphere inert at pressures higher than the atmospheric pressure; introducing a shaft (5) which has been diametrically contracted by refrigeration in the hermetic clamber (10) through both the bearing bore and the central bore of the rotor (7); maintaining the shaft (5)-cylinder block (3)-rotor (7) assembly inside the hermetic chamber (10) immobilized until the diametrical thermal dilatation of the shaft (5) causes said shaft to be secured to the wall of the central bore of rotor (7) and until a thermal balance between the parts has been achieved.

Abstract: A reciprocating compressor with a linear motor, comprising a hermetic housing (10), which lodges a cylinder (20), a piston (30); a rod (40), which is coupled to the piston (30) and which is axially displaceable by a linear motor (50); a first supporting means (70) and a second supporting means (80), which are elastically deformable and coupled to the housing (10) and, respectively, to the cylinder (20) and to the rod (40), and which are electromagnetically displaceable in opposite directions, in order to provoke the axial displacement of the cylinder (20) and of the piston-rod assembly (30, 40) between the upper and lower dead point positions.

Abstract: A hermetic compressor for refrigeration systems, having a plurality of pistons of piezoelectric material (20) arranged within a hermetic shell (10), according to at least one sequential alignment and occupying, when in a first energizing condition, all of the corresponding internal volume of the hermetic shell (10). Each of the pistons (20) contracts relative to the same first lateral wall (14) of the hermetic shell (10) when in the second energizing condition, so as to have one of its end faces (21) distanced from the shell first lateral wall (14) in order to define the respective volume of fluid being compressed, which volume progressively decreases from the first to the last piston (20).

Abstract: A process for mounting the shaft to the rotor of an electric motor, comprising the steps of: positioning a cylinder block (3) and a rotor (7) relative to each other with a predetermined axial spacing therebetween and with the axes of a bearing bore of the cylinder block (3) and of a central bore of rotor (7) being aligned to each other inside a hermetic chamber (10) having an atmosphere inert at pressures higher than the atmospheric pressure; introducing a shaft (5) which has been diametrically contracted by refrigeration in the hermetic chamber (10) through both the bearing bore and the central bore of the rotor (7); maintaining the shaft (5)-cylinder block (3)-rotor (7) assembly inside the hermetic chamber (10) immobilized until the diametrical thermal dilatation of the shaft (5) causes said shaft to be secured to the wall of the central bore of rotor (7) and until a thermal balance between the parts has been achieved.

Abstract: A rotor with permanent magnets for an electric motor, comprising a plurality of magnets (2, 20) disposed around the circumferential surface of a rotor core (1, 10) and equally spaced from each other, an external cover (40), affixing the magnets against the rotor core, each magnet (20) being seated onto the core (10) through corresponding supporting means (30, 50, 60), which are restrained from displacements relative to each said magnet (20) and which are positioned, according to alignments parallel to each other and to the rotor access, symmetrically in relation to a longitudinal plane of symmetry (X) of the magnet (20) and spaced from each other by a distance smaller than the distance between the end lateral edges (21) of the magnet (20), in order to minimize the distance between the regions in which the reaction force of both the rotor core (10) and external cover (40) is applied on each magnet (20) under different temperature conditions of the rotor.

Abstract: Patent of invention for pressurizing and sealing device and process for hermetic systems, provided with a gas feeding conduit (1), comprising: a tubular body (10) defining an internal chamber (13) between a first end (11) which can be tightly seated against an open external end (2) of the gas feeding conduit (1) and a second open end (12), and a pressurized gas inlet nozzle (14) opened into the internal chamber (13); an elastomeric plug (30) which can be positioned inside the tubular body (10) in such a way that it can be selectively displaced from a pressurizing condition, sealing the second end (12) of the tubular body (10) when the internal chamber (13) and the hermetic system are pressurized through the pressurized gas inlet nozzle (14), to a plugging condition, in which it is sealingly fitted and maintained in the external end (2) of the gas feeding conduit (1) after said pressurization has ended; and an impelling means (40), which is coupled to the tubular body (10) and which can be selectively activate

Abstract: Oil pump for a variable speed hermetic compressor, comprising: a hermetic shell (1), which defines a lubricant oil sump (2) at its bottom and which lodges therewithin a cylinder block (3), supporting a vertical eccentric shaft (5), which carries an electric motor rotor (8), said eccentric shaft (5) being provided with at least one oil channel (9), having an upper end (9a) opened to the external part of the upper median portion of the eccentric shaft (5), said eccentric shaft (5) supporting at its lower end (5b) a pump rotor (10); at least one oil conducting channel (20), which is machined to the body of said rotor (8) and which presents a lower end opening (20b) facing the pump rotor (10) and an upper end opening (20a) for oil discharge to said oil channel (9), said oil conducting channel (20) having at least the part of its length, that includes the upper end opening (20a), radially spaced in relation to the eccentric shaft (5); a stationary oil collecting means (30), which is attached to the cylinder block

Abstract: Centrifugal oil pump for variable speed hermetic compressors, comprising: a hermetic shell (1), which lodges therewithin, a cylinder block (3), supporting a vertical eccentric shaft (5), whereto is mounted the rotor (8) of an electric motor (6), the eccentric shaft (5) being provided with at least one oil channel (9), having a lower end (9b), opened to a lower end (5b) of the eccentric shaft (5), wherein the eccentric shaft-rotor assembly attaches, at its lower part, an upper extension (12) of a pump rotor (10) and a tubular sleeve (20), attached to an inertial portion of the compressor and surrounding at least the portion of said pump rotor (10) external to the rotor (8), said pump rotor (10) presenting a centrifugation region (15), radially extending beyond the edges of the lower end (5b) of the eccentric shaft (5) and having a lower end nozzle (10b) that is permanently immersed in the oil sump (2), which is internally defined at the bottom of the shell (1) and with at least an upper radial nozzle (11b), co

Abstract: A rotary compressor having a cylinder within which an eccentric piston is rotated. A vane has one end mounted in a radial slot in the cylinder and an insert is mounted in the other end of the vane. The insert has a concave face to contact the outer surface of the piston as it rotates and an engaging element in the form of a key lodged in slots in the insert and the piston, acts simultaneously on the piston and insert and restrains the piston from rotating.

Abstract: Discharge valve actuating system for hermetic compressors of the type having a piston (3) reciprocating inside a cylinder (2) which pumps gas to a discharge chamber (22) maintained in selective fluid communication with the cylinder (2) through a discharge orifice (12) provided on a valve plate (10) and closed by a respective reed discharge valve (40). There is at least one subchamber (70) which maintains with the discharge chamber (22) a fluid communication that is constantly blocked by a movable blocking element (60) which moves between an operative position of contact with the discharge valve (40) when at a closed position and an inoperative position of spacing from said discharge valve (40). The inoperative and operative positions are defined as a function of the pressure inside the discharge chamber (2) in relation to the pressure existing in the subchamber (70) during each pumping cycle of the piston (3).

Abstract: A two-piece connecting rod for a reciprocating hermetic compressor, of the type comprising a first connecting rod portion (20), including a smaller eye (21) and the rod (22) of the connecting rod, and a second connecting rod portion (30), including a larger eye (31), and further comprising: an engaging element (23), provided at one of the parts defined by the first and second connecting rod portions (20, 30); a receiving housing (32), provided at the other of said parts and shaped in such a way as to receive during the assembly of the connecting rod the engaging element (23), and permit the articulation between the first and second connecting rod portions (20, 30), at a diametral plane common to both the eyes and the geometrical axis of the rod (22) of the connecting rod, and mounting means (40), carried by one of said first and second connecting rod portions (20, 30) and acting on the other of said portions, in order to prevent said portions from moving away from each other, by involuntary mutual axial spaci

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.

Abstract: A method of permanently bending a first part of a subject body having non-linear elastic properties about a bending line to a desired angle relative to a second part of the body in which a first set of data is produced from similar bodies of the amount of permanent bending obtained as a function of different amounts of angular displacement of the first part, the first part of a subject body is permanently bent to a first angle different from said desired angle by angularly displacing the subject body's first part by an amount determined by the first set of data and thereafter the first part of the subject body is further angularly displaced from the first angle to permanently bend its first part to the desired angle.

Abstract: Driving system and method for an electronically commutated multi-speed motor having a coiled stator and a rotor with at least one permanent magnet and having an electronic circuit that feeds voltage to the coils (1, 2, 3) of the stator according to a relative rotor position as sensed by a sensor mounted to the motor shaft, or by interpreting the voltages induced to the stator coils by the moving rotor. A voltage is supplied to an inverter circuit (10) whose output is applied to motor stator coils (1, 2, 3). The voltage applied to the inverter circuit is varied, making use of a speed switching circuit that can include a voltage multiplier or a voltage divider circuit and the variation of the inverter output voltage varies the motor speed.

Abstract: Control circuit for a refrigerating system, used in hermetic compressors, comprising first and second temperature sensors (61,62) and a current sensor (63) for the current drawn by the motor, said control circuit including a central processing unit (30), which instructs at least the selective closing of first and second driving switches (40,50), which are respectively connected with a main winding (11) and with a starting winding (12) of an electric motor (10), when the first temperature sensor (61) detects a temperature inside the refrigerating cabinet corresponding to a maximum value of an ideal temperature interval, previously informed to the central processing unit (30), the temperature of the motor (10) and the current drawn by said motor (10) being within their respective ideal operative values, previously informed to said central processing unit (30).

Abstract: The assembly is used in a reciprocating hermetic compressor of the type comprising a cylinder block (4), presenting a cylinder (11), within which a piston (20) reciprocates, a smaller eye (31) of a connecting rod (30) being introduced into and retained inside said piston (20), through an articulating pin (40), having its end portions supported on respective radial lateral openings of the piston, wherein the portions, which are defined by the peripheral edge of at least one end of the articulating pin and the adjacent internal surface (23a, 24a) of the respective lateral radial opening (23, 24) of the piston (20), are attached to each other by at least one welding spot contained in a respective first welding region, located in a sector of about 90 degrees of said end and symmetric to a diametral line of said end of the articulating pin (40), said line being parallel and coplanar relative the longitudinal axis of the piston (20), at least one welding spot being provided in at least a second welding region oppos

Abstract: A starting device for a single phase induction motor, of the type having a cage type rotor and a stator having at least one main coil and one starting coil, which is connected in series with first and second terminals of an alternating current source. The starting device comprises a relay (RL) having at least one contact, with one of the terminals thereof being connected to the first terminal (1) of the alternating current source (F), while the other terminal of said contact is connected to the terminal of the starting coil (L2); and a coil (B) for actuating the relay; an electronic timer circuit (T), which is connected to the terminals of the coil (B) for actuating the relay (RL), in order to open the contact of the latter by supplying a current to the coil (B) thereof, thereby finishing the starting operation of the motor (M), after a period of time has elapsed from the motor (M) powering up.