A heat insulating box of a refrigerator includes a non-flammable heat-insulator particularly a vacuum heat-insulator made of a board-shape molded inorganic fiber. Therewith non-flammability of the heat insulator is ensured and a refrigerator box prevented from catching an outside caused fire is achieved, thus a refrigerator which is safe even when a flammable refrigerant is used and which is high in energy-saving is provided.
1. A refrigerator comprising:
a refrigeration cycle composed of a compressor, a condenser, a capillary tube and an evaporator linked together forming a cycle;
a heat insulating box including a heat-insulator, the heat-insulator is disposed in a space between an inner box facing inward of the refrigerator and an outer box facing outward of the refrigerator, in which the space is sealed and decompressed; and
a board-shape molded inorganic fiber disposed in the space as a heat insulator; and
a flammable refrigerant enclosed in the refrigeration cycle.
2. The refrigerator according to claim 1 ,
wherein the board-shape molded inorganic fiber includes at least silica.
3. The refrigerator according to claim 1 ,
wherein the board-shape molded inorganic fiber includes at least alumina.
4. The refrigerator according to claim 1 ,
wherein the heat insulating box does not include a foam resin insulator.
5. The refrigerator according to claim 4 ,
wherein the density of the board-shape molded inorganic fiber is at least 80 kg/m 3 and at most 400 kg/m 3 .
6. The refrigerator according to claim 4 ,
wherein the density of the board-shape molded inorganic fiber is at least 150 kg/m 3 and at most 300 kg/m 3 .
7. The refrigerator according to claim 4 ,
wherein the heat insulating box additionally includes a gas absorbent.
8. The refrigerator according to claim 4 ,
wherein the board-shape molded inorganic fiber is not placed in a gas-barring film.
9. The refrigerator according to claim 1 ,
wherein the board-shape molded inorganic fiber is not placed in a gas-barring film.
10. The refrigerator according to claim 1 ,
wherein the heat insulating box does not include an organic insulating material.