Cylinder assembly for hermetic compressor

Abstract

A cylinder assembly for a hermetic compressor includes a cylinder block having a cylinder in which a piston reciprocates; a cylinder head connected to a cylinder block to seal the cylinder, the head having an inlet hole and being divided by a partition into a first and a second discharge chamber that serve as an outlet path. A valve assembly formed between the cylinder block and the cylinder head, which controls refrigerant outlet and inlet to and from the cylinder according to different refrigerant pressures inside and outside the cylinder. When a sound wave (that is created as the suction valve or the discharge valve hits the valve plate) escapes to a discharge valve through a first and second discharge chambers, sound transmission loss occurs due to boundary interference and as a result, the sound wave is reduced. By this method, noise can be reduced in operating the compressor.

What is claimed is:  
     
         1 . A cylinder assembly for a hermetic compressor comprising: 
 a cylinder block having a cylinder in which a piston reciprocates;    a cylinder head connected to the cylinder block to seal the cylinder, the head defining an inlet hole and being divided by a partition into a first and a second discharge chamber that serve as an outlet path; and    a valve assembly formed between the cylinder block and the cylinder head, the valve assembly controlling refrigerant outlet flow and inlet flow to and from the cylinder.    
     
     
         2 . The cylinder assembly as recited in  claim 1 , wherein the partition has at least one connecting hole to connect the first and second discharge chambers.  
     
     
         3 . The cylinder assembly as recited in  claim 1 , wherein the partition is cylindrical, the space inside being defined as the first discharge chamber the space outside the second discharge chamber, the first discharge chamber having a valve assembly seating surface for the valve assembly being mounted thereon, and the partition being provided with an inlet path therein formed without connection to the first discharge chamber.  
     
     
         4 . The cylinder assembly as recited in  claim 3 , wherein the valve assembly comprises: 
 a valve plate having a suction port for connecting the inlet hole and the cylinder in fluid communication, and a discharge port for connecting the cylinder and the first discharge chamber in fluid communication;    a suction valve sheet having a suction valve for opening and closing the suction port;    a discharge valve sheet having a discharge valve for opening and closing the discharge port; and    a gasket between the discharge valve sheet and the valve assembly seating surface so as to block the inlet hole and the first discharge chamber, which has a cut-away portion that is positioned to limit a lifting gap of the discharge valve.    
     
     
         5 . The cylinder assembly as recited in  claim 4 , wherein the first discharge chamber has a stopper portion for controlling lift of the discharge valve, which is formed at the same or lower height as the valve assembly seating surface.  
     
     
         6 . The cylinder assembly as recited in  claim 1 , wherein a cylinder gasket is located between the cylinder head and the cylinder block to seal between the second discharge chamber and the cylinder.