JPH07120138A - Vacuum insulation box - Google Patents

Abstract

PURPOSE:To provide a refrigerator having improved design by a method wherein vacuum insulating materials and rigid polyurethane foams are used as insulating materials to be filled into an insulated box to reduce heat leakage, whereby strength of the box is enhanced so that deformation of the box can be reduced. CONSTITUTION:Protrusions or recessed grooves 11a, 12a are formed on outer covering materials 11, 12 of vacuum insulating material, and grooves for engagement with the grooves are provided on an inner box 14 and outer box 13 so that the grooves are engaged with one another.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating box which is a combination of a vacuum heat insulating material and a rigid urethane foam.

[0002]

2. Description of the Related Art The structure of a conventional vacuum insulation box is shown in FIGS.
It will be explained in 1. Reference numeral 16 is a vacuum heat insulating material, and the outer shell is an ultrathin stainless steel material, and an outer packaging material 1 which forms a shallow dented portion.
7 and the outer packaging material 18. Reference numeral 17a denotes a flange portion of the outer wrapping material 17, and 6 denotes a core material for holding a gap between the outer wrapping material 17 and the outer wrapping material 18, which is filled with a granular low thermal conductivity substance. An inner box 3 is made of metal or a plastic material and is formed into a box shape. Reference numeral 2 denotes an outer box, which is a box body that is one size larger than the inner box 3. Reference numeral 4 is a hard urethane foam that fills the gap between the outer box 2 and the inner box 3. In order to configure the box body with the hanging members, the core material 6 is filled in the squeezed dent portion of the outer packaging material 17 in order to avoid heat conduction loss, the outer packaging material 18 is covered, and after vacuum degassing, the airtight welding is performed at the flange portion 17a. Then, a thin flat plate-shaped vacuum heat insulating material 16 is completed, and an outer box 2 and an inner box 3 are formed.
The flat vacuum heat insulating material 16 is provided in each void formed by
Is internally provided, and hard urethane foam 4 is filled and foamed in the remaining voids to be integrated. In FIG. 11, the hard urethane foam 4 wraps around both sides of the vacuum heat insulating material 16, but in order to secure a flowable gap of the hard urethane foam 4, the vacuum heat insulating material 16 and the gap between the outer box 2 and the inner box 3 are formed. Needs to be large. Therefore, the vacuum heat insulating material 1
Usually, 6 is directly bonded to the outer box 2, and the void between the vacuum heat insulating material 16 and the inner box 3 is filled with the hard urethane foam 4.

Since the refrigerator has a function of storing food,
The door is rotatably fixed to the refrigerator main body, and a shelf or the like is provided so that food can be installed in the refrigerator, and the door also has an installation place so that food can be stored. The refrigerator is configured so that there is no problem even if the food is stored in the food storage space for a long period of time.
Even if the load of food and the load of the door do not cause the outer shell of the box supporting the load to fall. The strength of the box body of the refrigerator depends on the rigidity of the outer box 2, the inner box 3, the rigid urethane foam 4, etc., but in recent years, the plates of the outer box 2, the inner box 3, etc. have been manufactured to manufacture an inexpensive refrigerator. The thickness is reduced, and the strength of the box of the refrigerator body is not sufficient. As a conventional technique, Japanese Patent Laid-Open No. 59-185972 can be cited.

[0004]

Since the conventional vacuum heat insulating material 16 is filled with the granular core material 6 inside, it is difficult to maintain a stable shape, and the flatness after vacuum deaeration is made uniform. If the vacuum heat insulating material 16 cannot be secured and is fixed to the back surface of the outer box 2 with an adhesive, the entire area of the vacuum heat insulating material 16 cannot be evenly adhered, so that the adhesion area between the outer box 2 and the vacuum heat insulating material 16 is There has been a problem that the strength of the box is reduced and the strength maintenance of the box is lowered. As described above, since it is difficult to maintain the box strength even when the vacuum heat insulating material 16 is attached to the smooth outer box 2, the inner box 3 having many protrusions and dents forming the inner wall of the refrigerator
It was more difficult to attach the vacuum heat insulating material 16 to the.

[0005]

According to the first aspect of the present invention, as a means for solving the above-mentioned problems, the first aspect of the present invention provides a heat insulating box body by filling a heat insulating material in a space portion in which an outer box and an inner box are combined. A vacuum heat insulating material and a hard urethane foam are used as the heat insulating material, and a dent groove or a groove is provided on the inner box contact side of the vacuum heat insulating outer packaging material, and a dent groove or a groove of the vacuum heat insulating material is provided. Is formed integrally with the wall surface of the inner box on the opposite side to the above-mentioned concave groove or concave groove engaging with the concave groove. According to the second invention, a dent groove or a projecting groove is provided on the inner box contact side of the outer packaging material for vacuum heat insulating material, and the dent groove or the projecting groove is formed on the inner box wall surface on the side opposite to the dent groove or the projecting groove. The reinforcing rib to be engaged is integrally formed. Third
The invention of claim 1 forms a cold air passage that extends from the upper wall to the lower wall of the refrigerating chamber on the inner rear surface side of the inner box, and projects toward the rigid urethane foam side, and a vacuum having a recessed portion that engages with the projecting cold air passage. The heat insulating material is arranged on the heat insulating side of the projecting cold air passage of the inner box. A fourth invention is the same as the first, second and third inventions, in which a dent groove or a projecting groove is provided on the outer box contact side of the vacuum heat insulating material. A fifth aspect of the present invention is the first, second, and third aspects of the present invention in which the outer wall of the dent groove or the protruding groove provided on the outer box contact side of the vacuum heat insulating material is brought into contact with the outer box. According to a sixth aspect of the present invention, a dent groove or a projection groove is provided on the outer box contact side of the vacuum heat insulating material, and a projection or a dent groove engaging with the dent groove or the projection groove is provided on the outer box.

[0006]

According to the present invention, the outer packaging material for the vacuum heat insulating material is provided with the dent groove or the projecting groove on the contact side of the inner box, and the cross-section coefficient of the vacuum heat insulating material is increased, so that the rigidity of the vacuum heat insulating material is increased. Will increase. Further, a protrusion groove or a dent groove engaging with the dent groove or the protrusion groove is integrally formed on the wall surface of the inner box on the side opposite to the dent groove or the protrusion groove of the vacuum heat insulating material, and the inner box and the vacuum heat insulator are engaged. Therefore, even when a load such as food is stored in the inner box forming the inside of the heat-insulating box for a long period of time even when the collapse force to the box acts due to the load, The reinforcing effect of the engaging groove can prevent the inner box from collapsing. Further, a dent groove or a projection groove is provided on the inner box contact side of the outer packaging material for vacuum heat insulating material, and a reinforcing rib engaging with the dent groove or the projection groove on the inner box wall surface on the opposite side of the dent groove or the projection groove. Even if the inner box and the vacuum heat insulating material are integrally formed with each other, the same effect as described above can be obtained.

Further, a cold air passage extending from the upper wall to the lower wall of the refrigerating chamber and projecting to the rigid urethane foam side is formed on the rear side of the inside of the inner box, and a dent portion engaging with the projecting cold air passage is provided. Since the vacuum heat insulating material is arranged on the heat insulating material side of the projecting cold air passage, by covering the projecting cold air passage of the inner box, by mounting a decorative plate for distributing cold air in the refrigerator, Since the cold air passage protruding toward the hard urethane foam side is not exposed inside the refrigerator, the design of the inside wall of the refrigerator can be improved. Further, cold air having a relatively low temperature circulates in the cold air passage, and it was necessary to increase the thickness of the heat insulating material in order to prevent the dew on the surface of the outer box facing the cold air passage. Since the vacuum heat insulating material having a small thermal conductivity is arranged in this portion, the heat insulating thickness can be reduced and the internal volume efficiency can be improved. In addition, the vacuum heat insulating material is provided with a dent groove or a protruding groove on the outer box contact side, and the cross-sectional area coefficient of the vacuum heat insulating material is increased, and the rigidity of the vacuum heat insulating material is increased, as a matter of course. Since the rigid urethane foam is filled in the protrusion groove, the strength of the box body can be further improved by increasing the bonding area between the rigid urethane foam and the vacuum heat insulating material.

Further, by making the outer wall of the dent groove or the projection groove provided on the outer box contact side of the vacuum heat insulating material contact the outer box,
The cross-section coefficient of the vacuum heat insulating material is increased, and the rigidity of the vacuum heat insulating material is increased, as well as the outer box and the vacuum heat insulating material are in contact with each other, so that the outer box contact portion of the vacuum heat insulating material can keep the outer box falling down, The strength of the box can be increased. Furthermore, a concave groove or a convex groove is provided on the outer box contact side of the vacuum heat insulating material, and a convex groove or a concave groove engaging with the concave groove or the convex groove is provided on the outer box,
The outer box engaging portion of the vacuum heat insulating material can keep the outer box from collapsing, and the strength of the box body can be increased.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

FIG. 2 is a perspective view of the box structure, and 1 is a heat insulating box. 2 is an outer box which constitutes the outer shell of the heat insulating box body 3
Is an inner box that constitutes the inner shell of the heat insulating box.

FIG. 3 is a perspective view of a vacuum heat insulating material 5 provided with an embodiment of the present invention.

FIG. 4 is a sectional view taken along line AA of FIG.
Is the outer packaging material of the vacuum heat insulating material 5 on the contact side of the inner box 19. Reference numeral 7a is a recessed groove provided on the surface of the outer packaging material 7. Reference numeral 8 denotes an outer packaging material of the vacuum heat insulating material 5 on the outer box 2 side. The outer packaging materials 7 and 8 are formed of a plastic material such as polyacrylonitrile having an excellent gas barrier property into a desired shape by vacuum forming, pressure forming, or the like. The outer wrapping materials 7 and 8 of the vacuum heat insulating material 5 are filled with a granular core material 6 having low thermal conductivity, and the interior is decompressed and vacuum-sealed.

FIG. 5 is a transverse cross-sectional view of FIG. 2, showing a method of mounting the above-described vacuum heat insulating material 5 on a box body. Box 19
The hard urethane foam 4 is filled by engaging the recessed groove 7a provided in the outer packaging material 7 of the vacuum heat insulating material 5 with the protruding groove 19a provided in the above. As described above, the vacuum heat insulating material 5 engages with the protruding groove 19a provided in the inner box 19, but an adhesive agent or an adhesive material is used so that the engaging portion does not come off when the hard urethane foam 4 is filled. It is stuck due to. According to this structure, food is stored in the refrigerator and in the door (not shown) of the refrigerator, and even if the heat insulating box 1 is subjected to a falling force, the protruding groove 19a provided in the inner box 19 is vacuum insulated. Material 5
Since it is engaged with the recessed groove 7a provided in the outer packaging material 7, it is possible to prevent the inner box 19 from collapsing.

FIG. 6 shows an embodiment in which a reinforcing rib 9a that engages with the dent groove 7a is integrally provided on the wall surface of the inner box 9 facing the dent groove 7a provided in the outer wrapping material 7 of the vacuum heat insulating material 5. The box 9 is made of a plastic material such as injection molding. With this configuration, the reinforcing ribs 9 provided on the inner box 9 are also provided.
"a" has the same function as that of the protruding groove 19a provided in the inner box 19 described above, and can prevent the inner box 9 from collapsing.

FIG. 7 shows recessed grooves 7a and 10a provided on both sides of the outer packaging material 7 and the outer packaging material 10 of the vacuum heat insulating material 20. Since the vacuum heat insulating material 20 has a large sectional modulus, rigidity is improved.

FIG. 8 shows an embodiment in which a vacuum heat insulating material 20 having recessed grooves 7a and 10a formed on both surfaces of the outer packaging material 7 and 10 shown in FIG. A projecting groove 19a that engages with the recessed groove 7a is integrally formed on the wall surface of the inner box 19 on the opposite side of the provided recessed groove 7a, and the inner box 19 and the vacuum heat insulating material 20 are engaged with each other, and a vacuum is formed. A part of the outer peripheral edge of the concave groove 10 a provided on the outer packaging material 10 of the heat insulating material 20 on the outer box 2 side is in contact with the outer box 2. According to this configuration, the dent groove 10a is formed on the side of the outer packaging material 10 of the vacuum heat insulating material 20 that contacts the outer box 2.
By providing the above, the adhesive area between the rigid urethane foam 4 and the vacuum heat insulating material 20 is enlarged, so that the strength can be easily maintained, and the adhesive strength between the heat insulating material and the outer box 2 or the inner box 19 can be improved when used for a long time. Even if lowered, the engaging groove 7a
And the engaging force of 19a and the concave groove 10a of the vacuum heat insulating material 20
Inner box 1 by expanding the bonding area between
The fall of 9 can be prevented. Further, the vacuum heat insulating material 20
Part of the outer peripheral edge of the outer packaging material 10 on the outer box 2 contacting side is in contact with the back surface of the outer box 2, and the box body fall holding force acts,
Furthermore, the strength can be easily maintained.

FIG. 1 shows a vacuum heat insulating material 21 in a heat insulating box 1 having a cold air passage 14a extending from the upper wall to the lower wall of the refrigerating chamber on the rear side of the inner box 14 to the hard urethane foam 4 side.
Is an embodiment in which the inner box 14 of the vacuum heat insulating material 21 is provided.
The contact side is formed with a recessed groove 11a that encloses the cool air passage 14a. A cold air passage cover 22 is attached to the inside of the cold air passage 14a.
The cold air supplied into the cold air passage 14a is discharged to the inside of the refrigerator from the cold air discharge port 23 provided in 2.

Reference numeral 15a is a recessed groove provided in the back plate 15 of the outer box 13 constituting the heat insulating box 1, which extends from the machine room to the ceiling and communicates therewith. On the side of the vacuum heat insulating material 21 that contacts the back plate 15, a recessed groove 15a formed in the back plate 15 is formed.
The groove 12a that engages with is integrally formed. According to this structure, as in the above-described embodiment, the grooves 11a and 12a provided on the inner box 14 side and the back plate 15 side of the vacuum heat insulating material 21.
Is a groove that forms the cool air passage 14a of the inner box 14 and the rear plate 15.
It is possible to provide a heat-insulating box body having a large box strength by engaging with the recessed groove 15a provided in the above, preventing the box body 1 from falling down. Further, the cold air passage 14a of the inner box 14 is closed by the cold air passage cover 22 and is not exposed to the inside of the refrigerator, which provides a structure excellent in design. Further, since the recessed groove 15a provided on the back plate 15 communicates with the ceiling from the machine room,
It can function as a discharge duct for warm air radiated by a compressor, a condenser (not shown), etc. in the machine room.
Further, since the cool air having a relatively low temperature circulates in the cold air passage 14a, it is necessary to increase the heat insulation thickness in order to prevent the dew on the surface of the outer casing facing the cold air passage 14a. Since the vacuum heat insulating material 21 having a small thermal conductivity is disposed in this portion, the heat insulating thickness can be reduced, and a refrigerator having a high internal volume efficiency can be provided.

[0019]

As described above, according to the present invention, since the groove is formed in the vacuum heat insulating material and the inner box and the outer box and the grooves are engaged with each other, the strength of the box is increased. It is possible to provide a refrigerator that is less likely to fall and has a high design.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a heat insulating box having a structure of the present invention.

FIG. 2 is a perspective view of a heat insulating box structure.

FIG. 3 is a perspective view of the vacuum heat insulating material of the present invention.

FIG. 4 is a sectional view taken along the arrow in FIG. 3A-A.

5 is a cross-sectional view of a structure in which the vacuum heat insulating material of FIG. 3 is embedded in a heat insulating box.

FIG. 6 is a heat insulating box having a structure including an inner box and a vacuum heat insulating material of the present invention.

FIG. 7 is a cross-sectional view of a vacuum heat insulating material having the structure of the present invention.

8 is a transverse sectional view of a heat insulating box body having a structure in which the vacuum heat insulating material of FIG. 7 is embedded in a heat insulating box body.

FIG. 9 is a perspective view of a conventional vacuum heat insulating material.

FIG. 10 is a cross-sectional view of a conventional vacuum heat insulating material.

FIG. 11 is a transverse cross-sectional view of a heat insulating box body incorporating a conventional vacuum heat insulating material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Insulating box body, 2 ... Outer box, 3 ... Inner box, 4 ... Hard urethane foam, 5 ... Vacuum heat insulating material, 6 ... Core material, 7 ... Inner box side outer wrapping material, 7a ... Outer wrapping material dent groove part, 8 ... Outer box side outer packaging material, 9 ... Inner box, 9a ... Reinforcing ribs, 10 ... Vacuum insulation material outer packaging material, 10a ... Outer packaging material dent groove portion, 11 ... Vacuum heat insulating material outer packaging material, 11a ... Outer packaging material dent groove portion, 12 ... Vacuum heat insulating material Material Outer packaging material, 12a ... Outer packaging material protruding groove portion, 13 ... Outer box, 14 ... Inner box, 14a ... Cold air passage, 15 ... Back plate, 15a ... Back plate dent groove portion, 16 ... Vacuum heat insulating material, 17 ... Vacuum heat insulating material outer envelope Material, 17a ... Outer packaging material flange part, 18 ... Vacuum insulation material Outer packaging material, 19 ... Inner box, 19a ... Inner box protruding groove part, 20 ... Vacuum insulation material, 21 ... Vacuum insulation material, 22 ... Cold air passage cover, 23 ... Exhaust exit.

Claims (6)

[Claims] 1. A heat insulating box body configured by filling a heat insulating material in a space portion in which an outer box and an inner box are combined, wherein a vacuum heat insulating material and a rigid urethane foam are used as the heat insulating material. A dent groove or a protrusion groove is provided on the inner box contact side of the outer packaging material, and a protrusion or a dent engaging with the dent groove or the protrusion groove is formed on the inner box wall surface on the side opposite to the dent groove or the protrusion groove of the vacuum heat insulating material. A vacuum heat insulation box body characterized by integrally forming a groove. 2. A dent groove or a protrusion groove is provided on the inner box contact side of the outer packaging material for vacuum heat insulating material, and the dent groove or the protrusion groove is engaged with the inner box wall surface on the opposite side of the dent groove or the protrusion groove. A vacuum insulation box body characterized by integrally forming reinforcing ribs. 3. A cold air passage extending from the upper wall to the lower wall of the refrigerating chamber on the rear side of the inner box of the inner box and protruding toward the rigid urethane foam side, and having a dent portion engaging with the projecting cold air passage. A vacuum heat insulating box body, wherein a vacuum heat insulating material is disposed on the heat insulating material side of the projecting cold air passage of the inner box. 4. The vacuum insulation box body according to claim 1, wherein the vacuum insulation material is provided with a dent groove or a projection groove on the outer box contact side. 5. The vacuum heat insulating box according to claim 1, 2 or 3, wherein an outer wall of a dent groove or a projecting groove provided on the outer box contacting side of the vacuum heat insulating material is brought into contact with the outer box. body. 6. A vacuum heat insulating material is provided with a dent groove or a projecting groove on the outer box contact side, and a projection or a dent groove engaging with the dent groove or the projecting groove is provided on the outer box. One, two
Alternatively, the vacuum heat insulating box body according to the item 3.