A crankshaft (1) for a refrigerant compressor, the crankshaft (1) at least comprising a cylindrical shaft element (2), a crankpin (3) for driving a compressor piston of the refrigerant compressor, and means for conveying lubricant from a lower end region (4), facing away from the crankpin (3), of the shaft element (2) in the direction of the crankpin (3), in order to supply lubricant to movable parts of the refrigerant compressor, wherein at least one surface section of a surface of the crankshaft (1) comprises at least one flow disruptor, which flow disruptor is, based on the geometry and/or characteristics thereof, configured to break up vapor bubbles and/or gas bubbles in the lubricant flowing around the crankshaft (1) in an operating state of the refrigerant compressor.

A hermetic compressor includes an airtight case a lower portion of which oil is stored in; a frame received in the airtight case; a compression mechanism disposed in the frame and to compress a refrigerant; a motor mechanism including a stator fixed to the frame and a rotor to rotate inside the stator; a rotation shaft coupled to the rotor and provided with a cavity at a lower portion of the rotation shaft, wherein the rotation shaft rotates together with the rotor and operates the compression mechanism; a stationary shaft inserted into the cavity of the rotation shaft, fixed to the airtight case, and provided with a helical groove formed on an outer circumferential surface; and an oil raising member fixed to the cavity of the rotation shaft and configured to surround the stationary shaft. The oil raising member raises the oil stored in the airtight case.

Lubricant holder for vertical conveying of lubricant using a crankshaft of a coolant compressor includes a sleeve element having a clear cross-section, an inner element having a mantle surface extending along a longitudinal axis of the inner element from a lower to an upper end, and on which a spiral is arranged that projects away from the mantle surface, runs spirally from the lower end region to the upper end region of the mantle surface, and delimits a channel, at least in certain areas. In an operating state of the lubricant holder the inner element is arranged within the clear cross-section with its mantle surface, at least in certain areas. In the region of the upper end of the mantle surface, at least one contact section is arranged, which projects away radially beyond the mantle surface, and the progression of which deviates from the spiral-shaped progression of the spiral.

The invention relates to a refrigerant compressor, comprising: a preferably hermetically sealable compressor housing; an electric drive unit, comprising a rotor (4) and a stator (3); a crankshaft (1), which is connected to the rotor (4) for conjoint rotation and which has a longitudinal axis (2); a piston-cylinder unit, which can be driven by the crankshaft (1); wherein the electric drive unit is designed as an external rotor motor and the rotor (4) has a carrier element (12) extending outward radially with respect to the longitudinal axis (2) at least in some sections and the carrier element (12) is connected to the crankshaft (1) for conjoint rotation. According to the invention, in order to enable an increased delivery rate of lubricant from a lubricant sump together with preferably low or reduced height of the compressor, a sleeve-shaped lubricant receiver (8) for centrifugally conveying lubricant from a lubricant sump formed in a bottom region of the compressor housing toward the piston-cylinder unit is provided on a side of the carrier element (12) facing away from the piston-cylinder unit (5), the sleeve-shaped lubricant receiver (8) being joined to the carrier element (12) for conjoint rotation.

The invention relates to a coolant compressor having a compressor housing (6), an electric drive unit comprising a rotor (4) and a stator (3), a crankshaft (1) rotationally fixedly connected to the rotor (4) and having a longitudinal axis (2); and a piston-cylinder unit (5) that can be driven by the crankshaft (1). In order to permit an increased feed rate of lubricant from a lubricant sump, according to the invention, on an end of the crankshaft (1) that is opposite to the piston-cylinder unit (5) there is arranged a sleeve-like lubricant receptacle (8) for the centrifugal delivery of lubricant out of the lubricant sump in the direction of the piston-cylinder unit (5), wherein the sleeve-like lubricant receptacle (8) is fixed to the crankshaft (1) via a fixing section (9), wherein the fixing section (9) of the sleeve-like lubricant receptacle (8) is at least partly arranged between crankshaft (1) and rotor (4) in the radial direction in relation to the longitudinal axis (2) of the crankshaft (1).

An interior permanent magnet motor includes a stator provided with a plurality of slots and a rotor rotatably disposed inside the stator. A plurality of permanent magnets of the same polarity are disposed at equal intervals in a circumferential direction inside the rotor. A plurality of flux bathers are provided on left and right sides of one end of each of the plurality of permanent magnets adjacent to an outer circumferential surface of the rotor. A ratio of a number of slots of the stator to a number of magnetic poles of the rotor is 3:2 or 3:4. The number of permanent magnets provided in the rotor is ? of the number of magnetic poles of the rotor.

The invention relates to a lubricant receptacle (1) for vertically conveying lubricant by means of a crankshaft (2) of a coolant compressor (3), said lubricant receptacle (1) comprising at least one rotationally symmetrical, sleeve-type receiving section (4) for receiving lubricant, wherein the longitudinal axis (8) of the receiving section (4) can be arranged coaxially with a longitudinal axis of the crankshaft (2) of the coolant compressor (3), and comprising a securing section (16) connected to the receiving section (4) in order to secure the lubricant receptacle (1) on the crankshaft (2), as well as comprising at least one end region (5) connected to the receiving section (4) which closes the the receiving section (4) apart from an inlet opening (6), wherein the inlet opening (6) permits the entry of lubricant from a lubricant sump (7) of the coolant compressor (3) into the receiving section (4) of the lubricant receptacle (1) protruding at least partially into the lubricant sump (7), wherein the inlet opening (6) is arranged in the end region (5) around the longitudinal axis (8), wherein, when viewed in the direction of the longitudinal axis, the inlet opening (6) either has a circular peripheral shape and a mid-point of the inlet opening is offset in relation to the longitudinal axis (8), or the inlet opening (6) has a non-circular peripheral shape when viewed in the direction of the longitudinal axis.

A crankshaft, an inverter compressor and a refrigeration device are provided. The crankshaft has a main shaft, a crank, and a crank shaft at an end of the main shaft through the crank. The main shaft has an oil suction inner chamber, and an oil distribution channel penetrating the crank shaft. An outer wall surface of the main shaft has a first spiral oil groove and a second spiral oil groove. One end of each of the first spiral oil groove and a second spiral oil groove is in communication with the oil suction inner chamber. Another end of the first spiral oil groove and another end of the second spiral oil groove are formed as a first hole channel and a second hole channel in communication with the oil distribution channel, respectively.

Inside a sealed container (101) of a refrigerant compressor (100), lubricating oil (103) having a kinematic viscosity at 40 C. of 0.1 mm.sup.2/S to 5.1 mm.sup.2/S is stored, and an electric element (106) and a compression element (107) are accommodated. The compression element (107) is provided with, as a shaft part, a crankshaft (108) comprising a main shaft (109) and an eccentric shaft (110), and as bearing parts, a main bearing (114) that axially supports the main shaft (109) and an eccentric bearing (119) that axially supports the eccentric shaft (110). At least one surface of the main shaft (109) and the eccentric shaft (110) is subjected to a surface treatment, e.g., formation of an oxide film, having a hardness equal to or greater than that of a bearing part (the main bearing (114) or the eccentric bearing (119)). Satisfactory reliability in sliding parts can thereby be achieved even if lubricating oil having lower viscosity is used.

A compressor may include a hermetic case to store oil in a lower portion thereof, a compression mechanism part to compress a refrigerant, a power train part to generate a driving force, a rotational shaft to transmit the driving force generated from the power train part to the compression mechanism part and including a hollow portion and a female screw part formed at the hollow portion, and an oil pumping member inserted into the hollow portion of the rotational shaft and including an oil pumping part which moves the oil stored in the lower portion of the hermetic case up and a male screw part which is coupled to the female screw part of the rotational shaft. Since the oil pumping member and the rotational shaft are firmly coupled to each other, the reliability of the oil supplying is improved.