Patent ID: 7033150
Filing Date: 2006-04-25
Classification: F04B,Y10S

Abstract:
1. A hermetic type compressor having an airtight container comprising: a cylinder having a bore in which a piston reciprocates; a valve assembly which closes the open end of the bore; and a bolt which fastens the valve assembly, with a compression space including the bore, the piston and the valve assembly, wherein: the cylinder has a bolt hole including a hollow portion through which the bolt is passed and an internally threaded portion in which a thread of the bolt is engaged; the internally threaded portion of the cylinder is positioned adjacent the bore at a position between both ends of the bore; the bore is locally deformed outwards near the internally threaded portion when the thread of the bolt is tightened in the internally threaded portion of the cylinder; and the distance from the open end of the bore to the position of the tip of the piston at the moment when the pressure in the compression space reaches the discharge pressure level is shorter than the distance from a plane flush with the open end of the bore to the beginning of the internally threaded portion of the cylinder which is to engage with the bolt passed through the hollow portion.