Discharge valve arrangement for a hermetic compressor

Abstract

Discharge valve arrangement applied in a hermetic compressor used, for example, in household refrigeration systems including a valve plate closing an end of a compression cylinder and provided with suction and discharge orifices contained within the inner contour of the axial projection of the compression cylinder, said suction orifice occupying an annular sector external to the axial projection of a discharge orifice and being closed by a flexible suction vane having a bending median portion. The valve plate is provided with a plurality of discharge orifices distributed in at least one of the regions defined externally and internally to the contour of the flexible suction vane, each discharge orifice provided internally to the contour of the flexible suction vane being axially aligned with a respective through opening provided in said bending median portion.

1 . A discharge valve arrangement for a hermetic compressor to be used in refrigeration systems and comprising: a cylinder block defining a compression cylinder; a valve plate closing an end of the compression cylinder and provided with suction orifices and discharge orifices contained within the inner contour of the axial projection of the compression cylinder, at least one suction orifice occupying an annular sector external to the axial projection of a discharge orifice closed by a discharge valve comprising a flexible discharge vane, said suction orifice being closed by a suction valve comprising a flexible suction vane presenting: a mounting end portion to be affixed to the valve plate; a bending median portion; and a sealing end portion operatively associated with the suction orifice, characterized in that the valve plate is provided with a plurality of discharge orifices distributed in at least one of the regions defined externally and internally to the contour of the flexible suction vane, each discharge orifice provided internally to the contour of the flexible suction vane being axially aligned with a respective through opening provided in the bending median portion of the flexible suction vane. 
     
     
         2 . The arrangement, as set forth in  claim 1 , characterized in that the bending median portion of the flexible suction vane is provided with a through opening, any discharge orifice, whose axial projection is internal to the contour of the flexible suction vane, having its axial projection contained in the interior of said through opening. 
     
     
         3 . The arrangement, as set forth in  claim 2 , characterized in that it comprises a central discharge orifice having its axial projection internal to said through opening. 
     
     
         4 . The arrangement, as set forth in  claim 3 , characterized in that the central discharge orifice is aligned with the axis of the compression cylinder. 
     
     
         5 . The arrangement, as set forth in  claim 2 , characterized in that it comprises a single discharge orifice having its axial projection contained in the interior of said through opening. 
     
     
         6 . The arrangement, as set forth in  claim 5 , characterized in that it comprises at least another discharge orifice having its axial projection external to the contour of the flexible suction vane. 
     
     
         7 . The arrangement, as set forth in  claim 2 , characterized in that at least part of the discharge orifices are disposed so as to be subject to the same flow restriction applied by the flexible discharge vane during its opening operation. 
     
     
         8 . The arrangement, as set forth in  claim 3 , characterized in that it comprises at least other two discharge orifices having their axial projections external to the contour of the flexible suction vane and being disposed in an alignment containing a central discharge orifice and which is orthogonal to the axis of the flexible discharge vane, said two discharge orifices being symmetrical in relation to the axis of the compression cylinder. 
     
     
         9 . The arrangement, as set forth in  claim 1 , characterized in that at least part of the discharge orifices of the plurality of discharge orifices present the same cross-sectional area. 
     
     
         10 . The arrangement, as set forth in  claim 1 , characterized in that the discharge orifices of the plurality of discharge orifices present distinct cross-sections. 
     
     
         11 . The arrangement, as set forth in  claim 1 , characterized in that the flexible suction vane comprises a plurality of through openings, each containing, in its interior, the axial projection of a respective discharge orifice. 
     
     
         12 . The arrangement, as set forth in  claim 11 , characterized in that it comprises a central discharge orifice. 
     
     
         13 . The arrangement, as set forth in  claim 12 , characterized in that the central discharge orifice is aligned with the axis of the compression cylinder. 
     
     
         14 . The arrangement, as set forth in  claim 11 , characterized in that the discharge orifices having their axial projections internal to the contour of the flexible suction vane are disposed orthogonally to the axis of the flexible discharge vane, said discharge orifices being symmetrical in relation to the axis of the compression cylinder. 
     
     
         15 . The arrangement, as set forth in  claim 14 , characterized in that at least part of the discharge orifices are disposed so as to be subject to the same flow restriction applied by the flexible discharge vane during its opening operation. 
     
     
         16 . The arrangement, as set forth in  claim 11 , characterized in that at least part of the discharge orifices of the plurality of discharge orifices present the same cross-sectional area. 
     
     
         17 . The arrangement, as set forth in  claim 11 , characterized in that the discharge orifices of the plurality of discharge orifices present distinct cross-sections. 
     
     
         18 . The arrangement, as set forth in  claim 11 , characterized in that it comprises at least another discharge orifice having its axial projection external to the contour of the flexible suction vane. 
     
     
         19 . The arrangement, as set forth in  claim 18 , characterized in that the other external discharge orifice is disposed so as to be subject to the same flow restriction applied by the flexible discharge vane to the other discharge orifices during its opening operation. 
     
     
         20 . The arrangement, as set forth in  claim 11 , characterized in that it comprises at least other two discharge orifices having their axial projections external to the contour of the flexible suction vane. 
     
     
         21 . The arrangement, as set forth in  claim 20 , characterized in that the other two discharge orifices are disposed so that all the discharge orifices are subject to the same flow restriction applied by the flexible discharge vane during its opening operation. 
     
     
         22 . The arrangement, as set forth in  claim 20 , characterized in that said other two discharge orifices are disposed in an alignment which contains the central discharge orifice and which is orthogonal to the axis of the flexible discharge vane, said two discharge orifices being symmetrical in relation to said axis. 
     
     
         23 . The arrangement, as set forth in  claim 22 , characterized in that at least part of the discharge orifices of the plurality of discharge orifices present the same cross-sectional area. 
     
     
         24 . The arrangement, as set forth in  claim 22 , characterized in that the discharge orifices of the plurality of discharge orifices present distinct cross-sections. 
     
     
         25 . The arrangement, as set forth in  claim 1 , characterized in that it comprises only discharge orifices having their axial projections positioned externally to the contour of the flexible suction vane. 
     
     
         26 . The arrangement, as set forth in  claim 25 , characterized in that one of said discharge orifices is centralized and aligned with the axis of the compression cylinder. 
     
     
         27 . The arrangement, as set forth in  claim 26 , characterized in that at least part of the discharge orifices are disposed so as to be subject to the same flow restriction applied by the flexible discharge vane, during its opening operation. 
     
     
         28 . The arrangement, as set forth in  claim 27 , characterized in that at least part of the discharge orifices are disposed in an alignment containing a central discharge orifice and which is orthogonal to the axis of the flexible discharge vane, said discharge orifices being symmetrical in relation to said axis. 
     
     
         29 . The arrangement, as set forth in  claim 28 , characterized in that some of the discharge orifices present the same cross-sectional area. 
     
     
         30 . The arrangement, as set forth in  claim 29 , characterized in that all the discharge orifices present distinct cross-sections.