A compressor may include a compression cylinder, a compression piston, a crankshaft, an injection bore, a position sensor, and a valve assembly. The compression piston is disposed within the compression cylinder and is operable to compress a vapor disposed within the compression cylinder from a suction pressure to a discharge pressure. The crankshaft is operable to cycle the compression piston within the compression cylinder. The injection bore may be in fluid communication with the compression cylinder and may be operable to selectively communicate intermediate-pressure vapor at a pressure between the suction pressure and said discharge pressure to the compression cylinder. The position sensor may measure a rotational position of the crankshaft. The valve assembly may be associated with the injection bore. The valve assembly may be operable to control passage of fluid from the injection bore into the compression cylinder in response to data provided by the position sensor.

An electric-driven air pump includes an outer housing unit, an electric-driven mechanism and a piston mechanism. The outer housing unit includes a connecting seat with a gas outlet section, and a cylinder with a cylinder chamber. The electric mechanism is mounted to the outer housing unit and includes a motor. The piston mechanism includes a driven piston disposed in the cylinder chamber, a threaded driving rod formed with a helical guide slot, rotated by the motor, and connected to the driven piston such that rotation of the threaded driving rod drives reciprocal movement of the driven piston in the cylinder chamber, and a guide pin fixed in the driven piston and extending into the helical guide slot to be driven along the helical guide slot.

A linear compressor includes a linear motor in which a mover reciprocates with respect to a stator; a compression unit configured to form a compression space in a cylinder while a piston connected to the mover of the linear motor reciprocates in the cylinder; a plurality of discharge covers in which each discharge space is provided to accommodate refrigerant discharged from the compression space, and the each discharge space is sequentially communicated therewith; and a gas bearing configured to guide part of refrigerant accommodated in a discharge space of any one of the plurality of discharge covers between the cylinder and the piston to lubricate between the cylinder and the piston with the refrigerant, wherein at least part of a discharge cover in contact with the compression unit is exposed to an outside of a discharge space of another discharge cover.

A compressor (22) has: a case (32) defining: a first cylinder bank (70) having a plurality of cylinders (76, 77); a cylinder head (100); a suction port (26); a discharge port (28); and an economizer port (30); a plurality of pistons, each individually associated with a respective one of the cylinders; and a crankshaft (202) held by the case for rotation about a crankshaft axis and coupled to the pistons. The first cylinder bank cylinder head is divided into: a first suction chamber (130); a second suction chamber (132); and a single discharge chamber (128). The first cylinder bank first suction chamber is coupled to the suction port. The first cylinder bank second suction chamber is coupled to the economizer port. The first cylinder bank discharge chamber is coupled to the discharge port.

A reciprocating type compressor having a structure in which a rotational support of a rotational shaft and a cylinder are manufactured as separate components; a frame provided with the rotational support fixes the cylinder; and a cylinder head is fixed to the frame to cover the cylinder.

A reciprocating type compressor includes a crank shaft that is coupled to a rotor of a motor to transfer a rotational force, a piston that compresses a refrigerant while linearly moving within a cylinder of a compression portion, a connecting rod that connects the crank shaft to the piston to convert a rotational force of the crank shaft into a linear motion of the piston, and a cylinder boss integral body in which the cylinder and a boss that encloses the crank shaft are integrally formed at right angles to each other.

A swash plate compressor includes a cylinder block accommodating a piston for compressing a refrigerant, a front housing coupled to the cylinder block and having a crank chamber, a rear housing having a suction chamber and a discharge chamber and coupled to the cylinder block, and a suction reed plate inserted between a valve plate and the cylinder block. The swash plate compressor includes: a first orifice hole through which the refrigerant in the crank chamber passes; a second orifice hole communicating between the first orifice hole and the suction chamber; an intermediate flow path configured to connect the first orifice hole and the second orifice hole; and the valve plate inserted into the rear housing and having a suction chamber pressure-maintaining space connected to the suction chamber and configured to maintain a pressure equal to a pressure in the suction chamber.

A piston compressor having at least two piston/working space combinations, wherein each piston/working space combination includes at least one fluid inlet channel and one fluid outlet channel, the at least one fluid inlet channel being connected fluidically to a low pressure collecting volume, and/or the at least one fluid outlet channel being connected fluidically to a high pressure collecting volume, wherein the low pressure collecting volume comprises a first part collecting volume and at least one second part collecting volume, the first part collecting volume and the second part collecting volume being connected fluidically to one another via a first overflow channel and at least one second overflow channel, and/or the high pressure collecting volume comprises a first part collecting volume and at least one second part collecting volume.

Compressor head fixing device, a compressor and a refrigeration device. The compressor head fixing device includes a cylinder block and a cylinder head cover, the cylinder head cover being connected to the cylinder block by a fastener, the cylinder block being provided with a compression chamber and an assembly hole configured to fix the fastener; a noise reduction chamber, provided on the cylinder block; and a communication passage, provided in the cylinder block and the cylinder head cover, and being in communication with the assembly hole, the noise reduction chamber and the compression chamber. The compressor head fixing device has a compact structure, a length of the exhaust passage is shortened and the exhaust pressure is reduced.

A compressor includes a cylinder crankcase defining a cylinder which is closed by a valve plate provided with at least one discharge orifice associated with a discharge valve and defining, with the cylinder, a compression chamber; a cylinder cap seated against the valve plate and inside which is defined a discharge chamber. A portion of the cylinder cap is dimensioned to receive the entire flow of refrigerant gas released through the discharge orifice and accelerate said gas flow so as to produce an instantaneous reduction in the pressure gradient between the upstream and downstream sides of the discharge valve, in the moment the latter opens.