Guide passage between the piston and housing of a compressor

A compressor comprising:

• a suction chamber;
• a discharge chamber;
• a cylinder block for having a periphery wall to define a cylinder bore;
• a valve plate connected to the cylinder block, wherein the valve plate separates the cylinder bore from the discharge chamber and the suction chamber;
• a discharge port formed in the valve plate to connect the discharge chamber to the cylinder bore, wherein part of the discharge port is located radially outside of the cylinder bore;
• a piston located in the cylinder bore, wherein the piston moves from a top dead center position to a bottom dead center position to draw refrigerant gas into the cylinder bore from the suction chamber, and the piston moves from the bottom dead center position to the top dead center position to compress and discharge refrigerant gas to the discharge chamber, wherein the piston has a circumferential surface and an end face;
• a compression chamber defined by the cylinder block, the valve plate and the piston;
• and
• a machined surface formed on at least one of the piston and the cylinder block, wherein the machined surface defines a gas guide passage in the compression chamber to facilitate the flow of compressed gas from the compression chamber to the discharge port when the piston is located substantially at the top dead center position.

A compressor comprising:

• a housing;
• a cylinder bore formed in the housing;
• a suction chamber formed in the housing;
• a discharge chamber formed in the housing;
• a discharge port connecting the discharge chamber to the cylinder, wherein part of the discharge port is located radially outside of the cylinder bore;
• a piston located in the cylinder bore, wherein the piston moves from a top dead center position to a bottom dead center position to draw refrigerant gas into the cylinder bore from the suction chamber, and the piston moves from the bottom dead center position to the top dead center position to compress and discharge refrigerant gas to the discharge chamber;
• a compression chamber defined by an enclosure, wherein the enclosure is formed by the piston and the housing;
• and
• a means for facilitating the flow of compressed gas.