| 摘要 |
PROBLEM TO BE SOLVED: To reduce a pressure loss of gas piping without increasing a refrigerant sealing amount and to decrease an input of a compressor in a refrigerant using a hydrocarbon refrigerant. SOLUTION: Discharge gas piping 12, a condenser piping 13, evaporator piping 10 and suction gas piping 9 for forming a refrigerating cycle are radially reduced to decrease a sealing amount of a combustible hydrocarbon refrigerant in the cycle. When the refrigerant is leaked in the refrigerator, its leaking amount can be reduced to avoid riskiness of an explosion. However, in this case, the pressure loss of the radial reduction of the piping 12, 9 is increased, and an input (power) of the compressor 7 is increased. Then, the inner diameter of the piping 12 is increased larger than that of condenser pipeline 13 or the inner diameter of the piping 9 is increased larger than that of the piping 10 to reduce the pressure losses of the piping 12 and the piping 9. In this case, an increase in the refrigerant sealing amount due to the increase in the diameters of the piping is slight.
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