Refrigerant compressor

A refrigerant compressor (1) with

• a hermetically encapsulated compressor housing (2),
• an electric drive unit (3) arranged in a housing interior of the compressor housing (2) and comprising a rotor (4) rotatable about an axis of rotation (14), a stator (5), and a crankshaft (6), which crankshaft (6) is connected to the rotor (4) in a torque-proof manner,
• a piston-cylinder unit (7) arranged in the housing interior and comprising a piston (9), which piston (9) is movably arranged in a cylinder (8) of the piston-cylinder unit (7) and can be driven by the crankshaft (6) to compress refrigerant,
• a lubricant receptacle (10) for conveying lubricant (11) from a lubricant sump (13) arranged in a bottom area (12) of the compressor housing (2) vertically via the crankshaft (6), when the refrigerant compressor (1) is in an operating state,
• wherein viewed in a first direction (15) the stator (5) extends from a first stator section (16) to a second stator section (17) and the rotor (4) extends from a first rotor section (22) to a second rotor section (23), wherein the first direction (15) is parallel to the axis of rotation (14) and points from the bottom area (12) to the piston-cylinder unit (7),
• wherein the crankshaft (6) is partially arranged in a bush-like section (21) of a compressor block (20), wherein, viewed in radial directions (24) normal to the first direction (15) and pointing away from the axis of rotation (14), an interspace (25) is formed between the second stator section (17) and the compressor block (20), in which interspace (25) the second rotor section (23) is arranged at least partially,
• wherein, viewed in the radial directions (24), a gap (26) is formed between the second rotor section (23) and the compressor block (20), wherein for the lubricant (11) at least one through-hole (27) is provided in the compressor block (20) between the crankshaft (6) and the gap (26),
• wherein an accumulation volume (35) for accumulating lubricant (11) is provided between a lateral surface (30) of the crankshaft (6) and an inner wall (36) of the bush-like section (21) of the compressor block (20), wherein the accumulation volume (35) is fluidically connected with the at least one through-hole (27),
• wherein the crankshaft (6) comprises an inner channel (28) for vertically conveying the lubricant (11) within the crankshaft (6) in the operating state of the refrigerant compressor (1), a connection hole (29) fluidically connecting the inner channel (28) with the lateral surface (30) of the crankshaft (6), a helical groove (31) arranged on the lateral surface (30) for further vertically conveying the lubricant (11),
• wherein, viewed in the first direction (15), the helical groove (31) extends on the lateral surface (30) of the crankshaft (6) from a first surface section (32) via an intermediate surface section (33) to a second surface section (34), with the first, intermediate and second surface sections (32, 33, 34) being arranged in the bush-like section (21) of the compressor block (20), and
• wherein the accumulation volume (35) for accumulating lubricant (11) is provided only between the intermediate surface section (33) or the intermediate surface section (33) and the second surface section (34) on the one hand and the inner wall (36) of the bush-like section (21) of the compressor block (20) on the other hand.