Abstract: A control method and a system for controlling the piston of a resonant linear compressor including at least one electronic control unit, the electronic control unit including at least one observing electronic circuit and at least one control circuit associated to each other. The observing electronic circuit is configured for: measuring at least one electric magnitude of the electric motor; estimating at least one set of electric parameters and at least one set of mechanical parameters of the resonant linear compressor; and estimating and providing at least one control parameter of the system for the control circuit based on the measured electric magnitude measured and on the estimated set of electric and mechanical parameters. The control circuit is configured for actuating the electric motor from the at least one control parameter.

Abstract: The process basically comprises: dissolving a lamellar disulphide, as a source of the solid lubricant, in an aqueous solvent, forming a first aqueous solution; dissolving a reducing agent, as hydroxylamine, sodium hypophosphite or sodium borohydride, in an aqueous solvent, forming a second aqueous solution; mixing the first and second aqueous solutions, forming a third aqueous solution; neutralizing the pH of the third aqueous solution; dissolving a sulphur source, in an aqueous solvent, forming a fourth aqueous solution; mixing the third and fourth aqueous solutions, forming a fifth aqueous solution, which is contained and heated in an autoclave; cooling the fifth aqueous solution to the room temperature; and removing, from the autoclave, the nanoparticles in powder form.

Abstract: The present invention refers to a process of obtaining alkylaromatic compounds where there is a higher selectivity for the production of monoalkylaromatic compounds by selection of modified acid solid catalysts in an integrated process comprising an alkylation and transalkylation of aromatic and/or polyaromatic compounds for the selective production of monoalkylaromatic compounds, as well as regeneration (in situ) of acid solid catalysts selected for this process. The process of the present invention enables the achievement of monoalkylated compounds with high rates of conversion, selectivity and yield.

Abstract: The present invention relates to an arrangement integrated by at least one reed-type suction valve and at least one flexible stop which, arranged within the compression cylinder of the compressor, acts as end-of-stroke for the movement of said suction valve. Thus, flexible stop includes an angular inertial arrangement, so that it includes a free end spaced from the free end of suction valve. In addition, free end of flexible stop is cooperative to the movement of piston.

Abstract: A system and method of locking housings that have two different stages, one being generally used for transportation after an initial production stage, and the other being intended for final use of the product, preferably used on electric compressor inverters. One example presents a system for locking housings that have a base (1), a cover (2) and internal elements (4) arranged in an internal portion of the base (1), the cover (2) being locked to the base (1) by at least one fastening element (3), the fastening element (3) having first reversible locking stage (a) and second irreversible locking stage (b), the locking system being configured so that the reversible locking stage (a) will enable the opening of the housing for access to the internal elements (4), and the irreversible locking stage (b) will effect tamper-proof closure of the housing.

Abstract: The present device is applied to a linear driving unit which comprises: a linear electric motor (M) formed by a motor housing (C) which is electrically excited and affixed to a fixed structure (1), and by a magnetic armature (A) which is displaced in a reciprocating axial movement; and a helical resonant spring (50) having an end coupled to the fixed structure (1) and an opposite end coupled to the magnetic armature (A). The deformation control device (60) is mounted to contact a surface extension of the resonant spring (50), which is elastically and radially deformed, and to generate friction with said surface extension and/or an elastic deformation in the deformation control device (60), absorbing energy in a value sufficient to at least minimize said radial elastic deformation of the resonant spring (50).

Abstract: The arrangement is applied to a compressor which comprises: a crankcase, carrying a cylinder provided with a lateral slot and in which is housed a piston provided with two radial holes and with an eccentric axial hole; a connecting rod connected to a crankshaft driven by an electric motor and having a smaller eye mounted in the piston; and a wrist pin having a first end turned to the bearing hub of the crankcase, a second end turned to the lateral slot of the cylinder and a diametrical hole, adjacent to the second end in which is provided an engaging means, for the axial and rotational coupling of a tool for mounting and indexing the wrist pin, in the interior of the piston, in a position in which the diametrical hole is axially aligned with the eccentric axial hole, so as to allow an elastic pin to be introduced in said diametrical hole and in said eccentric axial hole.

Abstract: The process: includes mixing a metallic powder including iron or nickel or copper or mixtures of two or three elements thereof where the sum thereof defines at least 55% in mass of the metal matrix of the component to be produced, and a molybdenum disulfide powder as a densification agent and as a solid lubricant with a content from 3 to 30% in volume; filling a mold with the mixture and obtaining a compact presenting from 5 to 25% in volume of primary pores; and subjecting the compact to a temperature and time sufficient to allow the reaction of the molybdenum disulfide with the matrix, forming iron sulfide, nickel sulfide or copper sulfide, and the diffusion of the molybdenum in the matrix; and subjecting the compact to temperature sufficient to transform the sulfide into a liquid phase, filling the primary pores before finishing the sintering step of the compact.

Abstract: A linear motor (10), a linear compressor (100), a method of controlling a linear compressor (100), a cooling system (20) and a system of controlling a linear compressor (100) to operate a linear compressor (100) in resonance in it's the greatest possible efficiency throughout its operation are described.

Abstract: The present invention relates to a resonant mechanism for compressors which comprises a tubular body (1) containing at least two slot sets (12) that delimit an intermediate surface (13) which central portion has substantially ellipsoidal conformation (14) on which it is located a hole (15) through which the resonant spring will be affixed (2); a resounding spring (2) housed within the tubular body (1); at least two fastening sets (3) for fastening the resonant spring (2) to the tubular body (1), and leaf flat springs (4) alternately and successively mounted with spacers (not shown) along with the circular side faces (11) of the tubular body (1). The slot sets (12) have a specific configuration to allow rigidity and flexibility suitable for the mechanism operation in situations where the resulting axial force differs from zero.

Abstract: An electronic device cabinet comprising a housing and a printed-circuit board positioned in an internal area of the housing and defining a dissipation chamber. The dissipation chamber is formed between a first surface of the printed-circuit board and a first dissipating surface of a dissipation board. The dissipation board is fitted into the housing. The printed-circuit board comprises at least one electronic component positioned in the dissipation chamber. The dissipation chamber further includes a filler in direct contact with a perimeter of the electronic component, with parts of the first surface of the printed-circuit board, with the tracks of the printed-circuit board, and with parts of the first dissipating surface of the dissipation board. The cabinet is configured so that a second dissipating surface of the dissipation board, opposite the first dissipating surface, is in direct contact with the external environment surrounding the cabinet.

Abstract: The compressor comprises a valve plate, to be affixed to a compressor block, and a suction valve (V) formed by a spacer body, having a median opening and a flexible vane, which has a fixing end portion provided with a contour, symmetrical or asymmetrical, in relation to a longitudinal axis (X) of the flexible vane and which presents peripheral edge portions to be seated against respective inner edge portions of the median opening for restricting coplanar, linear and angular displacements of the flexible vane in relation to the spacer body upon seating the flexible vane against the valve plate, in the interior of the median opening.

Abstract: The mounting arrangement is applied to a compressor which comprises: a piston having a cylindrical tubular body; and an actuating means connected to the piston to drive the latter in a reciprocating movement. The suction muffler comprises two tubular inserts, longitudinally disposed in the interior of the piston and having spaced apart open adjacent ends, and closed opposite ends respectively affixed to the top wall of the piston and to the actuating means, and defining, in the interior of the piston, a muffling chamber (C) and an annular passage medianly opened to the muffling chamber (C) and communicating an open rear end of the piston with a suction valve provided in a top wall of said piston.

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.