Patent ID: 7404701

Claim:
A refrigerating system comprising: an evaporator for performing a cooling operation as a refrigerant is evaporated; a reciprocating compressor which includes a driving unit having a stator including an outer stator fixed inside a hermetic container, an inner stator disposed with a certain air gap with an inner circumferential surface of the outer stator, and a winding coil wound at one of the outer stator and the inner stator, to which power is applied from an external source, a mover including magnets disposed at regular intervals between the outer stator and the inner stator and linearly and reciprocally moved when power is applied to the winding coil and a magnet frame, in which the magnets are mounted, for transmitting a linear reciprocal motional force to a compression unit, a compression unit for performing a compressing operation on a refrigerant upon receiving the linear reciprocal motional force of the driving unit, and a lubrication unit for performing a lubricating operation; a condenser for changing the refrigerant compressed in the reciprocating compressor to a liquid refrigerant; a capillary tube for decompressing the refrigerant discharged from the condenser and transmitting it to the evaporator; an organic compound refrigerant sucked into the evaporator and comprising carbon and hydrogen, a sort of natural refrigerant, and having combustibility and explosiveness; and a mineral-based lubricant stored inside a hermetic container of the reciprocating compressor and performing a lubricating operation on each sliding part and supplied by the lubrication unit to each motional portion of the driving unit and the compression unit, wherein the mineral-based lubricant has a density of 0.866˜0.880 g/cm 3 , a flash point of above 140° C. and a kinematic viscosity of 7.2˜21.8 mm 2 /s at a temperature of 40° C. such that the mineral-based lubricant mixes with the organic compound refrigerant to perform the lubricating operation.