Refrigerator

Abstract

There is disclosed a refrigerator in which a refrigerant circuit on a high-pressure side is operated in a supercritical state, and an object of the refrigerator is to improve a freezing capacity while securely preventing dew condensation at an opening edge by a condenser. In the refrigerator including the refrigerant circuit constituted of a compressor, the condenser, a throttle means and an evaporator; and a dew condensation preventive pipe constituting a part of the condenser and disposed along the opening edge of an insulation box member, the refrigerant circuit on the high-pressure side is operated in the supercritical state, and the dew condensation preventive pipe is positioned on an upstream side of a refrigerant downstream region of the condenser.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a refrigerant circuit diagram of a refrigerator according to one embodiment of the present invention;

FIG. 2 is a schematic diagram schematically showing a refrigerant circuit of the refrigerator of FIG. 1;

FIG. 3 is the Mollier diagram of the refrigerator of the present embodiment;

FIG. 4 is a refrigerant circuit diagram of a refrigerator according to another embodiment of the present invention;

FIG. 5 is the Mollier diagram of the refrigerator of FIG. 5;

FIG. 6 is a refrigerant circuit diagram of a refrigerator according to still another embodiment of the present invention;

FIG. 7 is a refrigerant circuit diagram of a conventional refrigerator;

FIG. 8 is a schematic diagram schematically showing a refrigerant circuit of the refrigerator of FIG. 7;

FIG. 9 is the Mollier diagram of the refrigerator of FIG. 7 in a case where a conventional refrigerant is used (in a case where a supercritical pressure is not achieved in a refrigerant circuit on a high-pressure side); and

FIG. 10 is the Mollier diagram of the refrigerator of FIG. 7 in a case where a refrigerant circuit on a high-pressure side is operated in a supercritical state.

Claims

1. A refrigerator comprising: a refrigerant circuit constituted of a compressor, a condenser, a throttle means and an evaporator and operated on a high-pressure side in a supercritical state; anda dew condensation preventive pipe constituting a part of the condenser and disposed along an opening edge of an insulation box member,the condenser including at least a first condenser and a second condenser,the dew condensation preventive pipe being positioned between the first condenser and the second condenser.

2. The refrigerator according to claim 1, further comprising: a bypass pipe connected in parallel with the dew condensation preventive pipe; anda channel control unit which controls whether to pass a refrigerant through the dew condensation preventive pipe or the bypass pipe.

3. The refrigerator according to claim 1 or 2, wherein carbon dioxide is used as the refrigerant of the refrigerant circuit.