Whirlpool S.a.

Fabio Henrique Klein

Andrea Lopes

Dietmar Erich Bernhard Lilie

Marcos Guilherme Schwarz

Marcio Luiz Todescat

Fabricio Caldeira Possamai

Marcio Roberto Thiessen

Roberto Andrich

Luiz Fabiano Jovita

Rodrigo Link

Ivan Da Costa Pereira Filho

Fernando Antonio Ribas, Jr

Hugo Renato Seibel

Fabiano Domingos Silva

Luis Fabiano Jovita

Emilio Rodrigues Hülse

Egerhardt Graf

Cristiano Rafael Schramm

The present invention relates to a flow rate control system in refrigeration circuits, to a method for controlling a refrigeration system and to a refrigeration system properly speaking, which may include, for example, from a domestic refrigerator to an air conditioning system. In particular, the present invention is directed to a solution for the loss of efficiency in the expansion valve (), when the system load varies, making the expansion valve () operate below its nominal capacity and, therefore, at low efficiency. One of the ways to achieve the objectives of the present invention is through a flow rate control system in refrigeration circuits comprising a hermetic compressor fluidly connected to a closed circuit (). The closed circuit () comprising a condenser (), an evaporator () and a fluid expansion device (), the closed circuit () being filled with a fluid, the fluid expansion device () having a nominal expansion capacity and being positioned between the evaporator () and the condenser (), the hermetic compressor () promoting a fluid flow inside the closed circuit (), the closed circuit () having a circuit nominal flow rate capacity. In addition, the system comprises a flow control valve () which is positioned between an outlet of the condenser () and an inlet of the fluid expansion device (), the flow control valve () being modulated so that the fluid passing through the fluid expansion device () is always at nominal expansion capacity. A method for controlling a refrigeration system is also disclosed.

Flow rate control system in refrigeration circuits, method for controlling a refrigeration system and a refrigeration system

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

Mounting arrangement for the piston of a reciprocating hermetic compressor

The fixation arrangement of the present invention is applied to a compressor of the type which comprises a shell () inferiorly defining an oil sump () and housing: a crankshaft () journalled in a cylinder block () and carrying a rotor () formed by a stack of annular laminations; and an oil pump () comprising a tubular sleeve (), which is superiorly mounted to the rotor () and inferiorly immersed in the oil sump (), and a pump shaft (). The fixation arrangement comprises at least one retention element () radially and axially locked around the tubular sleeve () and having a radially outer locking portion (), which is seated and radially forced against a respective confronting circumferential extension () defined between two consecutive annular laminations, in order to axially lock the tubular sleeve () to the rotor ().

Fixation arrangement for an oil pump in a refrigeration compressor

Oil pump for hermetic refrigerating compressor comprising a tubular sleeve having an upper portion affixed to at least one of the parts of crankshaft and rotor, and a lower portion having a lower end immersed in the lubricant oil, said tubular sleeve being provided with an inner surface presenting, along at least part of its longitudinal extension, at least one helical groove upwardly extending from the lower end; and a pump body disposed inside the tubular sleeve and defining, with the adjacent helical groove of the tubular sleeve, a lubricant oil ascending channel, said pump body presenting a lower end portion mounted to one of the parts of shell, cylinder block and stator, so as to be freely displaced within the tubular sleeve, in radial directions orthogonal to the crankshaft and rotatively locked in relation to the rotor.

Oil pump for a refrigerating compressor

A piston-and-cylinder assembly, used in cooling sys terns that may include, for example, refrigerators, air-conditioning systems and the like. In order to solve the problems of volumetric loss (or of cooling capacity) of compressors in general, according to the present invention, one foresees configuring the cylinder () of the compression chamber in such a manner that the friction will be as low as possible in the phase in which the gas being compresses still does not exert a significant force onto the piston () top and will only have a significant effect during the phase in which the gas to be compressed exerts a greater force onto the piston (), a moment when the volumetric loss impairs the efficiency of the compressor.

Piston-and-cylinder assembly with a variable diametral clearance, and a cylinder for use in a piston-and-cylinder assembly with a variable diametral clearance

The present invention relates to a control system for protection against breakage of the lubricating-oil film in the bearings of hermetic compressors, as well as to a control method that has the objective of guaranteeing that a variable-capacity compressor should be maintained above a minimum rotation in order to prevent the oil film close to the respective bearing from breaking. One of the forms of achieving the objectives of the present invention is by means of a control system for protection against break of the lubricating-oil film in bearings of hermetic compressors, a microprocessor () actuating a set of switches (SWM) selectively, so as to generate a rotation at the motor-compressor assembly (), the compressor () having a minimum rotation (RPMmin) of the compressor () so that the oil film will not be broken.

Control system and method for protection against breakage of lubricanting-oil film in compressor bearings

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Fabio Henrique Klein