AN ARRANGEMENT FOR COUPLING THE INLET AND OUTLET TUBES OF A HERMETIC COMPRESSOR TO A REFRIGERATION SYSTEM

Abstract: An arrangement for coupling the inlet and outlet tubes of a hermetic compressor to a refrigeration system, each inlet or outlet tube (12) comprising a tubular extension provided with an inner annular projection (13), into which is loosely and telescopically introduced and affixed an end portion (21) of the tube (20) of the refrigeration system, each inner annular projection (13) having an internal diameter which is smaller than the external diameter of the end portion (21) of the tube (20), defining a stop onto which said end portion (21) will be seated.

Description: 7ΛN ARRANGEMENT FOR COUPLING THE INLET AND OUTLET TUBES OF A HERMETIC COMPRESSOR TO A REFRIGERATION SYSTEM Field of the Invention The present invention refers to a constructive solution applied to the inlet and outlet tubes of a hermetic compressor of the type used in small refrigeration systems. Background of the Invention Hermetic compressors usually consist of a motor- compressor unit mounted inside a hermetically sealed shell. These compressors usually have nozzles provided in their shells and which allow communication between the inside of the compressor and the external environment. In these constructions, an inlet tube is provided in one of the nozzles, whereas in another nozzle is provided an outlet tube, each of said inlet and outlet tubes projecting outwardly from the compressor shell, in order to be hermetically coupled to an end portion of a tube, for example of a refrigeration circuit, to which the compressor is associated. To attach each end portion of the tube of the refrigeration system to a respective inlet or outlet tube of the compressor, each of said end portions should be dimensioned to be loosely and telescopically fitted inside the respective inlet or outlet tube and then affixed to the same. The fixation usually occurs by applying weld between the inner wall of the inlet or outlet tube and the outer wall of the tube of the refrigeration system. The tubes of the small refrigeration systems usually do not have a constant dimensional pattern, leading to respective end portions with diameters varying in relation to a nominal project value, in relation to which the inlet and outlet tubes are dimensioned. Depending on the degree of diametral variation of the end portion of the tube of the refrigeration system, the telescopic coupling of said end portion to the inside of the tube of the compressor may be so tight that it becomes infeasible to fit the parts, or to apply weld for attaching and sealing said parts to each other, or it may be so loose that weld leakage may occur to the inside of the tube of the compressor, surpassing the edge of the end portion of the tube of the refrigeration system. This excess weld may reach a value sufficient to interrupt the gas flow through the inlet tube. Disclosure of the Invention Thus, it is an object of the present invention to provide an arrangement for coupling the inlet and outlet tubes of a hermetic compressor to the tubes of a refrigeration system, which guarantees a loose telescopic fixation, inside said inlet and outlet tubes, of the end portions of the tubes of the refrigeration system whose external diameters range within certain limits in relation to a nominal project value, without allowing the occurrence of weld leakage to the inside of the inlet and outlet tubes, independently of the annular gap existing in said telescopic fitting. These and other objectives are achieved by providing an arrangement for coupling the inlet and outlet tubes of a hermetic compressor to the tubes of a refrigeration system, each of said inlet and outlet tubes comprising a tubular extension projecting outwardly from the shell of the hermetic compressor and inside which is loosely and telescopically introduced and affixed an end portion of a tube of a refrigeration system, the tubular extension of each inlet and outlet tubes incorporating an inner annular projection having an internal diameter which is smaller than the external diameter of the end portion of the tube of the refrigeration system, defining a stop onto which said end portion will be seated. Brief Description of the Drawing The invention will be described below, based on only one attached drawing, in which figure 1 illustrates schematically and partially a longitudinal cross- sectional view of the coupling region of one of the inlet and outlet tubes of the hermetic compressor constructed according to the present invention, the end of the tube of a refrigeration system being mounted to this inlet or outlet tube. Best Mode of Carrying Out the Invention The present invention will be described in relation to a compressor of the type used in small refrigeration systems, for example, said hermetic compressor having a shell 10 and an inlet or outlet tube 12, of which only one is illustrated, each tube 12 having a tubular extension projecting outwardly from the shell 10 and into which is telescopically introduced and attached the end portion of a tube 20 of a refrigeration system. According to the present invention, each tube 12 incorporates, at a portion of its tubular extension, an inner annular projection 13 having an internal diameter which is smaller than the external diameter of the end portion 21 of the tube 20 and which defines a stop for said tube 20. The coupling of the end portion 21 of the tube 20 to the tube 12 defines, between the inner wall of said tube 12 and the outer wall of the end portion 21 of the tube 20, an annular channel 30, which is internally closed by the inner annular projection 13 and onto which will be deposited the weld for affixing said parts defined by the end portion 21 of the tube 20 and by the tube 12. The inner annular projection 13 is obtained, for example, by the radial circumferential deformation of the wall of the tubular extension of the tube 12. With the construction of the present invention, it is possible to telescopically mount tubes 20 of a refrigeration system with different diameters to the tube 12 of a hermetic compressor, limiting the penetration of the weld inside said tube 12.

Claims: CLAIMS 1. An arrangement for coupling the inlet and outlet tubes of a hermetic compressor to a refrigeration system, each inlet or outlet tube (12) comprising a tubular extension projecting outwardly from the shell (10) of the hermetic compressor and inside which is loosely and telescopically introduced and affixed an end portion (21) of the tube (20) of a refrigeration system, characterized in that said tubular extension of each tube (12) incorporates an inner annular projection (13) having an internal diameter which is smaller than the external diameter of the end portion (21) of the tube (20), defining a stop onto which said end portion (21) will be seated. 2. The arrangement of claim 1, characterized in that the inner annular projection (13) is obtained by the radial circumferential deformation of the wall of the tubular extension of the tube (12) .

Inventors: ODORCZYK MARCOS FERNANDO, ODORCZYK, MARCOS, FERNANDO
Applicants: BRASIL COMPRESSORES SA, ODORCZYK MARCOS FERNANDO, EMPRESA BRASILEIRA DE COMPRESSORES S.A. - EMBRACO, ODORCZYK, MARCOS, FERNANDO
Application year: 2000
Main classification: F16L13
IPC codes: F04B39, F16L13