A hermetic compressor is disclosed. The hermetic compressor comprises compressing unit and an electromotive unit. The compressing unit comprises: a cylinder block having a compression chamber; cylinder head having a discharge chamber which is controllably couplable to the compression chamber; a discharge muffler body portion and a discharge muffler cover which form a discharge muffler chamber coupled to the discharge chamber; a piston configured to compress a refrigerant in the compression chamber; and a main frame having a least one mounting leg. The electromotive unit comprises: a stator; a rotor; and a crankshaft coupled to the rotor. The electromotive unit is configured such that rotary motion of the rotor relative to the stator causes rotation of the crankshaft which drives the piston to compress the refrigerant in the compression chamber. The compressing unit is coupled to the stator of the electromotive unit and supported by the at least one mounting leg of the main frame and the discharge muffler cover.

The disclosure provides a mechanism for sealing cylinder and cylinder head, comprising a gas outlet portion of the cylinder, the cylinder head and a seal structure; wherein the gas outlet portion is provided with an outlet and a position-retaining protruding edge surrounding an outside of the outlet; the seal structure comprises a first sealing ring arranged inward of the position-retaining protruding edge and comprises a heat insulating sheet, wherein the heat insulating sheet covers the first sealing ring to seal the outlet; the cylinder head covers the gas outlet portion, and a movable member and an elastic member configured to tightly press the movable member against the heat insulating sheet are arranged inside the cylinder head.

A linear compressor includes a cylinder that defines a compression space of a refrigerant and has a cylindrical shape, and a piston disposed in the cylinder and reciprocating along an axis of the cylinder. The cylinder includes a gas inlet on an outer circumferential surface and a supply port radially passing through the cylinder and communicating with the gas inlet. The gas inlet includes a first gas inlet and a second gas inlet disposed behind the first gas inlet, and the supply port includes a first supply port communicating with the first gas inlet and a second supply port disposed behind the first supply port and communicating with the second gas inlet. A flow rate passing through the first supply port is different from a flow rate passing through the second supply port.

A linear compressor includes a cylinder that defines a compression space of a refrigerant and has a cylindrical shape, and a piston disposed in the cylinder and reciprocating along an axis of the cylinder. The cylinder includes a gas inlet formed on an outer circumferential surface of the cylinder, a supply port radially passing through the cylinder and communicating with the gas inlet, and a recess communicating with the supply port and formed on an inner circumferential surface of the cylinder. An angle formed by an axial cross section of the recess and a straight line extending the supply port and an angle formed by the axial cross section of the recess and a straight line extending the inner circumferential surface of the cylinder each are an acute angle.

A linear compressor includes a mover which linearly reciprocates, a stator generating a driving force to allow the mover to linearly reciprocate and having a cylinder space formed on an inner circumferential surface thereof, a cylinder inserted into the cylinder space of the stator and having a compression space compressing a refrigerant, a piston reciprocating in an axial direction inside the cylinder, a frame provided on one side of the stator in an axial direction and supporting the stator in the axial direction, and a cylinder support member separated from the frame, provided between an inner circumferential surface of the stator and an outer circumferential surface of the cylinder, having one end fixed to the stator and the other end fixed to the cylinder, and supporting the cylinder with respect to the stator in the axial direction.

A compressor including a casing having a cylindrical shape, and a compression mechanism housed in the casing. The compression mechanism having a housing including a pressing portion pressed against the casing and a weld portion welded to the casing. At least part of the pressing portion and at least part of the weld portion being arranged side by side in a circumferential direction of the casing.

Provided is a linear compressor. The linear compressor includes a piston, a cylinder, and a bearing inflow passage. The bearing inflow passage includes a first bearing inflow passage extending inward from an outer circumferential surface of the cylinder in the radial direction and a second bearing inflow passage extending from the first bearing inflow passage to an inner circumferential surface of the cylinder. The second bearing inflow passage extends from the inner circumferential surface of the cylinder in a circumferential direction.

A nitriding layer (13) is formed on the front surface side of a base material of a cylinder block (7) including an opening side end surface (7B) and each cylinder hole (12). Then, a piston sliding surface (12A) of each cylinder hole (12) is formed as a compound layer-removed hole (17) by removing a compound layer (16) that is located on the front surface side of the nitriding layer (13) by using polishing means such as, for example, honing and so forth. Further, a compound layer-removed surface (18) is formed on a part (A) where a compound layer-removed hole (17) and a cylinder inlet side tapered surface (12B) of each cylinder hole (12) intersect by using the polishing means such as, for example, the honing and so forth. This compound layer-removed surface (18) is formed as a tapered-state inclined surface of an angle α.

A compressor for a compressed-air feed of a compressed-air supply installation, for operating a pneumatic installation, includes: a first compression space; a second compression space; an air feed port; a compressed-air outlet; and a piston having a first face side, which is subjectable to pressure and which is directed toward the first compression space, and a second face side, situated opposite the first face side, which is subjectable to pressure and which is directed toward the second compression space, the first compression space being delimited by the first face side and the second compression space being delimited by the second face side. The first face side includes a full side and the second face side includes a step side. The piston is attached via a connecting rod to a drive. The first compression space and the second compression space are connected to one another via a connecting line.

A hermetic compressor may include a crankshaft having an input shaft rotatably supported on the cast-iron block along the crankshaft axis and connected to the electric motor rotary output, and an eccentric crankpin orbitally rotating about the axis as the crankshaft is rotated. A pair of opposed pistons may lie on the common plane. Each piston may be pivotably connected to one of the connecting rod piston ends to drive the pistons in an oscillatory manner within the cylinders as the crankshaft rotates. The piston and cylinder pairs may cause fluid to be pumped from the inlet port to the outlet port as the piston oscillates varying the volume of the enclosed space bound by the piston and the cylinder pairs.