Valve arrangement for hermetic compressors

Abstract

The arrangement can be applied to a compressor which comprises a compression cylinder closed by a valve plate provided with seat regions and with respective suction orifice and discharge orifice which are closed by a sealing end portion of a respective valve vane, to be peripherally seated against its seat region. The valve plate carries a support means, defined in the central region of the contour of at least one of the suction orifice and discharge orifice and incorporated to the valve plate by at least one radial arm. The support means has a stop surface, against which is seated a central region of the sealing end portion of the respective vane, said stop surface defining a projection in relation to the radial arm.

1 . Valve arrangement for hermetic compressors of the type which comprises: a cylinder crankcase defining a compression cylinder; a valve plate closing one end of the compression cylinder and which is provided with a suction orifice and a discharge orifice and with respective seat regions, each of said orifices being closed by a respective valve vane comprising a sealing end portion operatively associated with the respective orifice and peripherally seated, in a closed condition, against a seat region of the respective valve vane in the valve plate, the arrangement being characterized in that the valve plate carries a support means defined in the central region of the contour of at least one of said suction orifice and discharge orifice and incorporated to the valve plate by at least one radial arm, internal to the respective orifice, said support means having a stop surface, against which is seated a central region of the sealing portion of the respective vane, said stop surface defining a projection in relation to the radial arm. 
     
     
         2 . The arrangement, according to  claim 1 , characterized in that it comprises a single radial arm presenting a free end in which the support means is incorporated. 
     
     
         3 . The arrangement, according to  claim 1 , characterized in that the stop surface of the support means is coplanar to the seat region of the respective valve vane. 
     
     
         4 . The arrangement, according to  claim 1 , characterized in that the stop surface of the support means is elevated in relation to the seat region of the respective valve vane. 
     
     
         5 . The arrangement, according to  claim 1 , characterized in that stop surface presents a contour which is concentric and symmetric in relation to the longitudinal axis of the respective orifice in the valve plate. 
     
     
         6 . The arrangement, according to  claim 5 , characterized in that the stop surface is circular. 
     
     
         7 . The arrangement, according to  claim 5 , characterized in that the support means has its contour contained in the axial projection of the contour of the stop surface.