By using a core made of laminated sheets of inorganic fibers having a particular shape and composition as part of a vacuum heat insulator for a heat insulation box, a heat insulation box excellent in long-term heat insulating properties and productivity can be provided. The vacuum heat insulator can be shaped easily. Therefore, a vacuum heat insulator suitable for a required heat insulation portion can be produced easily and applied to a heat insulation box. This property can increase coverage of the vacuum heat insulator on the heat insulation box, thus improving heat insulating properties of the heat insulation box. This can improve heat insulating properties and productivity of a refrigerator, thermal storage box, cold storage box, or vending machine, and contribute to energy savings.
1. A refrigerator comprising:
a heat insulating box including
an inner box having an opening,
an outer box,
a lid for closing said opening,
at least one vacuum heat insulator disposed in a space between said inner box and said outer box at at least one of a back wall, a side wall and a top wall of the refrigerator, said at least one vacuum heat insulator comprising a core disposed in an enveloping member, and
foamed resin filled in said space between said inner box and said outer box, said foamed resin employing a flammable substance as a foaming agent; and
a cooling machine for cooling an inner space of said heat insulating box, said cooling machine employing a flammable substance as a refrigerant,
wherein said core is made of a fibrous laminate of at least two sheets of inorganic fibers, with opposing faces of said sheets being in contact with each other, said inorganic fibers containing SiO 2 as a main composition of said inorganic fibers, and further containing Al 2 O 3 , CaO and MgO as material compositions, and
wherein said enveloping member is made of a laminated film.
2. The refrigerator according to claim 1 , wherein said laminated film includes a first portion on a first side of said core and a second portion on a second side of said core, with said first portion and said second portion having different structures relative to one another.
3. The refrigerator according to claim 1 , further comprising an adsorbent in said at least one vacuum heat insulator.
4. The refrigerator according to claim 1 , further comprising a freezer compartment at a bottom thereof and a machine room outside of said freezer compartment, wherein said at least one vacuum heat insulator includes a vacuum heat insulator that covers sidewalls of said freezer compartment.
5. The refrigerator according to claim 4 , further comprising high-temperature refrigerant piping provided between said at least one vacuum heat insulator and said outer box.
6. The refrigerator according to claim 4 , wherein said at least one vacuum heat insulator includes a vacuum heat insulator that is provided between said machine room and said freezer compartment.
7. The refrigerator according to claim 1 , further comprising independent compartments having different temperature ranges, and an evaporator for each of said compartments, wherein said at least one vacuum heat insulator includes a vacuum heat insulator that is disposed in a heat insulating portion behind at least one of said evaporators.
8. The refrigerator according to claim 7 , wherein said at least one vacuum heat insulator includes a vacuum heat insulator that is disposed in a partition between said independent compartments.
9. The refrigerator according to claim 1 , further comprising a compressor, wherein said at least one heat insulator includes a vacuum heat insulator that is disposed in a partition between said compressor and said inner box.
10. The refrigerator according to claim 1 , further comprising a control circuit board, wherein said at least one vacuum heat insulator includes a vacuum heat insulator that is disposed in a partition between said control circuit board and said inner box.
11. The refrigerator according to claim 1 , further comprising a condenser in a bottom thereof, wherein said at least one vacuum heat insulator includes a vacuum heat insulator that is disposed in a partition between said condenser and said inner box.
12. The refrigerator according to claim 1 , further comprising a thermoplastic resin layer on at least a portion of an inner surface partially defining said space between said outer box and said inner box, wherein said at least one vacuum heat insulator is adhered to said inner surface via said thermoplastic resin layer by performing a hot melt bonding operation.
13. The refrigerator according to claim 1 , wherein
said at least one vacuum heat insulator includes plural vacuum heat insulators, with a first of said plural vacuum heat insulators positioned between a back wall of said inner box and a back wall of said outer box on an outer box side of said space, with a second of said plural vacuum heat insulators positioned between a top wall of said inner box and a top wall of said outer box on the outer box side of said space, with a third of said plural vacuum heat insulators positioned between a first side wall of said inner box and a first side wall of said outer box on the outer box side of said space, and with a fourth of said plural vacuum heat insulators positioned between a second side wall of said inner box and a second side wall of said outer box on the outer box side of said space.
14. The refrigerator according to claim 13 , wherein said laminated film includes a first portion on a first side of said core and a second portion on a second side of said core, with said first portion and said second portion having different structures relative to one another.
15. The refrigerator according to claim 13 , further comprising an adsorbent in each of said plural vacuum heat insulators.
16. The refrigerator according to claim 13 , further comprising a freezer compartment at a bottom thereof and a machine room outside of said freezer compartment, wherein said at least one vacuum heat insulator includes a vacuum heat insulator that covers sidewalls of said freezer compartment.
17. The refrigerator according to claim 16 , further comprising high-temperature refrigerant piping provided between one of said vacuum heat insulators and said outer box.
18. The refrigerator according to claim 16 , wherein said at least one vacuum heat insulator includes a vacuum heat insulator that is provided between said machine room and said freezer compartment.
19. The refrigerator according to claim 13 , further comprising independent compartments having different temperature ranges, and an evaporator for each of said compartments, wherein said at least one vacuum heat insulator includes a vacuum heat insulator that is disposed in a heat insulating portion behind at least one of said evaporators.
20. The refrigerator according to claim 19 , wherein said at least one vacuum heat insulator includes a vacuum heat insulator that is disposed in a partition between said independent compartments.
21. The refrigerator according to claim 13 , further comprising a compressor, wherein said at least one heat insulator includes a vacuum heat insulator that is disposed in a partition between said compressor and said inner box.
22. The refrigerator according to claim 13 , further comprising a control circuit board, wherein said at least one vacuum heat insulator includes a vacuum heat insulator that is disposed in a partition between said control circuit board and said inner box.
23. The refrigerator according to claim 13 , further comprising a condenser in a bottom thereof, wherein said at least one vacuum heat insulator includes a vacuum heat insulator that is disposed in a partition between said condenser and said inner box.
24. The refrigerator according to claim 13 , further comprising a thermoplastic resin layer on at least a portion of an inner surface partially defining said space between said outer box and said inner box, wherein at least one of said plural vacuum heat insulators is adhered to said inner surface via said thermoplastic resin layer by performing a hot melt bonding operation.