Discharge muffling chamber for refrigeration compressors and process for closing a discharge muffling chamber

Abstract

The compressor comprises a crankcase with at least one discharge muffling chamber having a bottom end wall provided with a threaded blind axial hole, a surrounding lateral wall, and an open end which defines an annular seat extending throughout the whole radial width of the surrounding lateral wall. A sealing gasket comprises a peripheral annular portion to be seated on the annular seat, and a median hole. A cover is seated on the sealing gasket and a fixation bolt has a head seated on the cover, a rod disposed through a median hole of the cover and trespassing the median hole of the sealing gasket, and a threaded end affixed in the blind axial hole.

1 . A discharge muffling chamber for refrigeration compressors of the type which comprises: a case lodging a crankcase carrying at least one discharge muffling chamber of tubular shape and having a closed bottom end wall presenting a threaded blind axial hole, a surrounding lateral wall, and an open end, presenting an annular seat; an annular sealing gasket seated on said annular seat; a cover provided with a median hole and seated on the sealing gasket; and a fixation bolt having a head seated on the cover, a rod projecting from the head and ending in a threaded end which is affixed in the interior of said blind axial hole, characterized in that said annular seat extends throughout the whole radial width of the surrounding lateral wall of the discharge muffling chamber, in the region of its open end, the sealing gasket comprising a peripheral annular portion seated on the annular seat, and a median hole to be trespassed by the rod of the fixation bolt. 
     
     
         2 . The chamber, according to  claim 1 , characterized in that the median hole of the sealing gasket is defined in a median annular portion, radially spaced from the peripheral annular portion and incorporated to the latter by means of a plurality of radial bridges. 
     
     
         3 . The chamber, according to  claim 2 , characterized in that the sealing gasket has its peripheral annular portion and median annular portion and its radial bridges coplanar to one another and obtained in a single piece. 
     
     
         4 . A process for closing a discharge muffling chamber, for a refrigeration compressor of the type which comprises: a case lodging a crankcase carrying at least one discharge muffling chamber of tubular shape and having a closed bottom end wall presenting a threaded blind axial hole, a surrounding lateral wall, and an open end, presenting an annular seat; an annular sealing gasket seated on said annular seat; a cover provided with a median hole and seated on the sealing gasket; and a fixation bolt having a head seated on the cover, a rod projecting from the head and ending in a threaded end which is affixed in the interior of said blind axial hole, characterized in that it comprises the steps of:
 forming the discharge muffling chamber, with its annular seat extending throughout the whole radial width of the surrounding lateral wall of the discharge muffling chamber in the region of its open end.   fitting the cover, through its median hole, around the rod of the fixation bolt;   providing a sealing gasket with a peripheral annular portion and with a median hole, and fitting the sealing gasket, through its median hole, around the rod of the fixation bolt, already carrying the cover;   mounting the assembly consisting of the fixation bolt, cover, and sealing gasket in the discharge muffling chamber, seating the peripheral annular portion of the sealing gasket against the annular seat, and affixing the end of the fixation bolt in the blind axial hole, in order to press the cover against the sealing gasket, closing the open end of the discharge muffling chamber.   
     
     
         5 . The process, according to  claim 4 , characterized in that the median hole of the sealing gasket is defined in a median annular portion, radially spaced from the peripheral annular portion and incorporated thereto by means of a plurality of radial bridges. 
     
     
         6 . The process, according to  claim 5 , characterized in that the sealing gasket has its peripheral annular portion and median annular portion and its radial bridges coplanar to one another and obtained in a single piece.