Fluid handling – Processes – Cleaning – repairing – or assembling
Patent
1998-02-19
1999-07-06
Chambers, A. Michael
Fluid handling
Processes
Cleaning, repairing, or assembling
251148, 141383, 285310, A61M 500
Patent
active
059186208
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention refers to a pressurizing and sealing device and process for hermetic systems, particularly used for supplying gases to hermetic compressors for cooling systems of the type used in refrigerators, freezers and air-conditioners, for example.
BACKGROUND OF THE INVENTION
The hermetic compressors for these cooling systems have their shells defining a hermetic chamber to be pressurized by an inert gas, such as nitrogen, and plugged in such a way as to prevent humidity from entering and consequently rusting the components located inside the hermetic chamber during the transport and warehousing of these compressors. Said pressurization is carried out through a gas feeding conduit, generally of a short length, attached to the hermetic shell so as to allow fluid communication between the interior and exterior of the chamber.
Before the inert gas is introduced into the interior of the hermetic shell, an open and of the gas feeding conduit is sealingly closed with an elastomeric element in the form of a plug, which is fitted under pressure and which is later perforated with a reduced diameter needle used to inject gas through the gas feeding conduit.
Although the needles have a small diameter, after they are removed at the end of the pressurizing operation of the shell, the plug remains with its structure broken, allowing the occurrence of small leaks of the gas introduced into the shell (close to 50 PPM). Besides this deficiency, this process of introducing gas into hermetic systems has the disadvantage of being a manual process, thus slow and subject to error.
DISCLOSURE OF THE INVENTION
Thus, it is an object of the present invention to provide a pressurizing and sealing device and process for hermetic systems, such as the hermetic shell of a cooling system compressor, which eliminates the occurrence of leaks which exist in the current technique and which will allow the automation of gas feeding in such systems.
This and other objectives are attained by means of a pressurizing and sealing device for hermetic systems, which is provided with a gas feeding conduit having an open external end comprising: a tubular body defining an internal chamber between a first end which can be tightly seated against the external end of the gas feeding conduit, and a second open end and a pressurized gas inlet nozzle which opens into the internal chamber; an elastomeric plug which can be positioned inside the tubular body in such a way as to be selectively displaceable from a pressurizing condition, sealingly closing the second end of the tubular body when the internal chamber and hermetic system are pressurized through the pressurized gas inlet nozzle, to a plugging condition in which it is sealingly fitted and retained in the external end of the gas feeding conduit after said pressurization has ended; and an impelling means which is coupled to the tubular body and which can be selectively activated through the second end of said body, so as to conduct the elastomeric plug from the pressurizing condition to the plugging condition.
According to the present invention, the pressurizing and sealing process comprises the steps of: a--tightly seating the first end of a tubular body against the open external end of the gas feeding conduit; b--closing a second end of the tubular body with an elastomeric plug; c--pressurizing an internal chamber, defined between the first and second ends of the tubular body; d--selectively displacing the elastomeric plug from the pressurizing condition, in which it closes the second end of the tubular body, to a plugging condition, in which it is sealingly fitted and retained in the open external end of the gas feeding conduit after the pressurization of said internal chamber has ended; and e--separating the first end of the tubular body from the tight seating condition at the end of the gas feeding conduit.
As it can be observed, the invention permits obtaining mechanical pressurizing and plugging conditions for said hermetic systems, without modifying or altering
REFERENCES:
patent: 2631001 (1953-03-01), Griswold
patent: 2640492 (1953-06-01), Sawicki
patent: 3785404 (1974-01-01), Gappisch et al.
patent: 3817302 (1974-06-01), Kowal et al.
patent: 5045081 (1991-09-01), Dysarz
Chambers A. Michael
Empresa Brasileira De Compressores S./A-Embraco
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