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A refrigerating system includes: an evaporator (2) for performing a cooling operation as a refrigerant is evaporated; a compressor (4) for compressing the refrigerant discharged from the evaporator as a mover is reciprocally moved; a condenser (86) for changing the refrigerant compressed in the reci

A refrigerating system includes: an evaporator (2) for performing a cooling operation as a refrigerant is evaporated; a compressor (4) for compressing the refrigerant discharged from the evaporator as a mover is reciprocally moved; a condenser (86) for changing the refrigerant compressed in the reciprocating compressor to a liquid refrigerant; and a capillary tube (8) for decompressing the refrigerant discharged from the condenser and transferring it to the evaporator. Hydrocarbon consisting of carbon and hydrogen, a sort of natural refrigerant, is used as the refrigerant, and a paraffin-based lubricant, a sort of a mineral oil, is used as the lubricant, so that a lubricating performance and a performance of the refrigerating system can be improved.

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The invention claimed is: 1. 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 disp

The invention claimed is: 1. 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/cm3, a flash point of above 140�� C. and a kinematic viscosity of 7.2˜21.8 mm2 /s at a temperature of 40�� C. such that the mineral-based lubricant mixes with the organic compound refrigerant to perform the lubricating operation. 2. The refrigerating system of claim 1 further comprising: a controller for varying a capacity of the compressor according to an ambient temperature and environment. 3. The refrigerating system of claim 2, wherein the controller determines an output value according to a phase difference between a current and a voltage. 4. The refrigerating system of claim 1, wherein the compression unit comprises: a piston connected to the mover and linearly and reciprocally moved; a cylinder into which the piston is slidably inserted to form a certain compression chamber; a suction valve mounted at a refrigerant passage formed at the piston and preventing a backflow of the refrigerant after being introduced into the compression chamber; and a discharge valve mounted at the front side of the cylinder and performing an opening and closing operation on a compressed refrigerant. 5. The refrigerating system of claim 1, wherein the lubrication unit comprises: a lubricant pumping unit for pumping a lubricant filled with a certain amount at a lower portion of the hermetic container; and a lubricant supply passage for supplying the lubricant pumped by the lubricant pumping unit to a frictional portion between the piston and the cylinder. 6. The refrigerating system of claim 1, wherein isobutane (R600a) which is hydrocarbon-based and has a molecular formula of CH(CH3)3 is used as the refrigerant. 7. The refrigerating system of claim 1, wherein the lubricant is a paraffin-based lubricant. 8. The refrigerating system of claim 1, wherein the lubricant has a viscosity index of 73˜99. 9. The refrigerating system of claim 1, wherein the lubricant has a flow point of below-25�� C. and a total acid number of below 0.01 mgKOH/g. 10. The refrigerating system of claim 1, wherein the lubricant has a water content of below 20 ppm and a breakdown voltage of above 30 kV. 11. 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 lubricant has a kinematic viscosity of 7.2˜21.8 mm2 /s at a temperature of 40�� C. a viscosity index of 73˜99 and a density of 0.866˜0.880 g/cm3 such that the mineral-based lubricant mixes with the organic compound refrigerant to perform the lubricating operation. 12. The refrigerating system of claim 11, wherein the lubricant is a paraffin-based lubricant. 13. The refrigerating system of claim 11 wherein the lubricant has a flash point of above 140�� C. 14. The refrigerating system of claim 11, wherein the lubricant has a flow point of below-25�� C. and a total acid number of below 0.01 mgKOH/g. 15. The refrigerating system of claim 11, wherein the lubricant has a water content of below 20 ppm and a breakdown voltage of above 30 kV.