Provided is, e.g., a compressor with a high reliability. A compressor (100) includes a hermetic container (1) sealed with lubricant oil, an electric motor (6) placed inside the hermetic container (1) and having a stator (6a) and a rotor (6b), a crankshaft (3) configured to rotate integrally with the rotor (6b), a compression mechanism (2) configured to compress refrigerant in association with rotation of the crankshaft (3), a discharge pipe (Pb) configured to guide the refrigerant compressed in the compression mechanism (2) to the outside of the hermetic container (1), and a tubular oil ring (15) provided between the compression mechanism (2) and the electric motor (6). A cutout (s1) is, at a lower portion of the oil ring (15), provided as a first insertion portion into which the discharge pipe (Pb) is inserted.

A lubricant holder for vertical conveying of lubricant using a crankshaft of a coolant compressor includes a sleeve element having a clear cross-section delimited by an inside wall, which cross-section extends along a longitudinal axis, from an upper end to a lower end, an inner element that has a mantle surface that extends along a longitudinal axis of the inner element, from a lower end to an upper end, wherein in an operating state the inner element is arranged within the clear cross-section with its mantle surface, at least in certain areas. At least one groove of the inside wall and/or of the mantle surface, which groove runs in spiral shape, has a varying angle of inclination, which preferably increases from the lower end to the upper end of the mantle surface.

Disclosed is a trochoid lubricant supply device that is configured to connect to a rotational shaft. A connector of the lubricant supply device is configured to reduce an oil leakage amount of lubricant, and is configured to insert to a lower portion of a rotational shaft. The connector includes: a rotator mounting member inserted into and fixed to the rotator of the lubricant supply device; a penetrating member that penetrates a fixer of the lubricant supply device; an enlarged diameter extending radially outwards from the penetrating member outside the fixer; and a rotational shaft mounting member extending axially in the diameter enlarged member and is fastened to the rotational shaft. Further, the lubricant supply device of the present disclosure can supply the oil regardless of a rotation direction of the rotational shaft by supplying the oil by a space pivoting about the rotational center of the rotator.

Disclosed are a fluid pumping device and a horizontal compressor. The fluid pumping device comprises a pump structure in the form of an internal-meshing gear pump and is provided with first and second pump members, a pump housing structure for accommodating the pump structure, and at least two suction paths and/or at least two discharge paths. Suction and compression cavities are defined between the first and second pump members; the at least two suction paths are configured to rotate with the pump structure, and a fluid can be sucked into the suction cavity via the at least two suction paths respectively; and the at least two discharge paths are configured to rotate with the pump structure, and the compressed fluid can be discharged from the fluid pumping device via the discharge paths respectively. The fluid pumping device is assembled in the horizontal compressor.

Refrigerant compressor installation comprising at least three compressors which are arranged in parallel between an intake conduit and a pressure conduit and which each comprise a lubricant sump unit, wherein the compressors, when in operation, work in such a way that the respective pressures in the respective lubricant sump units of the respective compressors form a pressure cascade according to which the compressors have a successively slightly decreasing pressure in the respective lubricant sump unit in a defined cascade sequence, and wherein the lubricant sump units are connected to each other in a manner corresponding to the cascade sequence by way of a lubricant conduit system for lubricant transport, and wherein each lubricant sump unit comprises a port to which is connected an insert element which on the one hand establishes communication with the lubricant conduit system and on the other hand is configured such that it predetermines, for the respective lubricant sump unit, a lubricant level from which lubricant is transported to the lubricant sump unit that follows next in the cascade sequence.

A reciprocating compressor may include a ball bearing positioned between a thrust surface of a cylinder block and a thrust surface of a crankshaft. The ball bearing may include a ball cage in a ring shape, a plurality of balls rotatably coupled to the ball cage, at least one washer positioned at least one of between the thrust surface of the cylinder block and the plurality of balls and between the thrust surface of the crankshaft and the plurality of balls, and a rotation preventing portion that limits rotation of the washer with respect to the corresponding thrust surface. According to a reciprocating compressor having the rotation preventing portion, as relative rotation of the washer with respect to the thrust surface of the cylinder block and/or the thrust surface of the crankshaft is restrained even if a rotational force higher than a viscous force acting on the washer is applied because a viscosity of oil is lowered, it is possible to eliminate the problem of deterioration of reliability and performance of the compressor.

The present invention provides a shaft-cylinder assembly for high-temperature operation comprising a dynamic sealing member having a helical coiled seal ring structure configured to be in contact with the shaft for providing dynamic sealing function; and a cylindrical cooling jacket positioned between the dynamic sealing member and the cylinder, and configured to circumferentially surround the dynamic sealing member and be circumferentially surrounded by the cylinder; wherein the cooling jacket includes one or more cooling channels, each of the one or more cooling channels is configured to circulate a cooling fluid for moving heat away from the dynamic sealing member.

A reciprocating type compressor may include a crank shaft that is coupled to a rotor of a motor to receive a rotational force and a connecting rod that is coupled to a pin of the crank shaft and converts a rotational force of the crank shaft into a linear motion of a piston. The connecting rod may include a first end having a tubular body that includes a pin insertion hole into which the pin of the crank shaft is inserted and a socket that projects from the tubular body, a second end coupled with the piston, and a main body that extends between the first end and the second end and having a ball that is received inside of the socket.

A compressor is provided that may include a refrigerant flow path provided in a rotational shaft so as to guide a refrigerant gas. The rotational shaft operates a compression device using a drive force of an electric motor. In such a structure, the refrigerant gas may be directly discharged to a discharge space without passing through other portions such that flow path resistance may be minimized.

A compressor according to the present disclosure may include a bearing member located out of a range in an axial direction of a rotor. Accordingly, the bearing member and the rotor cannot overlap each other so as to reduce a bearing area. This may result in reducing a frictional loss of the compressor and ensuring a press-fit length of the rotor, so as to prevent interference between the rotor and a stator. Also, an area of an oil passage can be increased without an increase in the frictional loss, resulting in an increase in an amount of oil supplied.