Hermetic compressor

Abstract

The present invention refers to a hermetic compressor and, more specifically, a hermetic compressor comprising a centrifugal pump ( 1 ) to provide oil for the moving parts of said compressor. In the compressor of the present invention, the vertical shaft ( 7 ) extends axially from the rotor to form a free end ( 8 ) in its inferior portion, and said free end ( 8 ) is sized to be received in a corresponding end ( 12 ) of the centrifugal pump ( 1 ).

1 . A hermetic compressor comprising a shell ( 5 ) which involves the component parts of the compressor, an oil reservoir ( 4 ) in the inferior part of the shell, a block cylinder incorporating a bearing to support a vertical shaft ( 7 ) on which a rotor ( 2 ) is assembled, and a centrifugal pump ( 1 ) that leads the oil to the moving parts  5  of the compressor, characterized in that said vertical shaft extends axially from the rotor ( 2 ) to form a free end ( 8 ) in its inferior portion, said free end being sized to be received in a corresponding end ( 12 ) of the centrifugal pump ( 1 ), and at least one portion of the inner sidewall of the end of the pump and at least one portion of the outer sidewall portion of the shaft assuming a  10  juxtaposed condition after the reception. 
     
     
         2 . A hermetic compressor, in accordance with  claim 1 , characterized in that the free end ( 8 ) of the vertical shaft ( 7 ) extends axially, and only enough, to enable the attachment of the end of the pump. 
     
     
         3 . A hermetic compressor, in accordance with  claim 2 , characterized in that  15  the free end ( 8 ) of the vertical shaft ( 7 ) extends up to a maximum of  6  mm. 
     
     
         4 . A hermetic compressor, in accordance with  claim 1 , characterized in that the free end ( 8 ) presents a machined portion having a reduced external diameter. 
     
     
         5 . A hermetic compressor, in accordance with  claim 1 , characterized in that the assembly between the free end ( 8 ) of the shaft and the corresponding end ( 12 ) of the pump ( 1 ) is carried out by interference fit. 
     
     
         6 . A hermetic compressor, in accordance with  claim 1 , characterized in that the assembly between the free end ( 8 ) of the shaft and the corresponding end ( 12 ) of the pump ( 1 ) is carried out by binding.