JP2014047966A - Heat insulation box and refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulation box having a partition wall excellent in load bearing.SOLUTION: A heat insulation box 1 includes an inner box 10, an outer case 21, and a heat insulation board 22 arranged between the inner box 10 and the outer case 21. The heat insulation box 1 includes a partition shelf 11 constituted by a partition wall 11a partitioning the inside of the inner box 10 into a plurality of spaces, and an extension part 11b extending vertically in a side of the partition wall 11a. The inner box 10 is constituted by a plurality of boards and extension parts 11b.

Description

  The present invention relates to a heat insulating box and a refrigerator including a heat insulating box.

  Generally, a household refrigerator is provided with a plurality of storage rooms such as a refrigerator compartment, a freezer compartment, and a vegetable compartment by dividing the interior of the inner box up and down by walls. Conventionally, refrigerators are manufactured by filling a heat insulating material such as urethane foam between an inner box and an outer box. And the wall which partitions an inner box was previously formed integrally with the inner box, and had sufficient intensity | strength by being filled with a heat insulating material inside.

On the other hand, Patent Document 1 discloses a technique in which a heat insulating member is brought into close contact with an inner box and configured as a partition wall. FIG. 8 is a perspective view showing a heat insulating member for a partition wall of Patent Document 1. As shown in FIG. The heat insulating member 100 is injected into a mold with a predetermined amount of expanded polystyrene particles (hereinafter referred to as expanded beads), and then at about 90 to 110 ° C. with a vapor pressure (primary vapor pressure) of about 0.5 kg / m ^2. By heating, it is solidified as a foam, and further, the vapor pressure is increased to ¹ to ² kg / m ² (secondary vapor pressure), and the heating temperature is increased to 150 to 200 ° C. so that the upper and lower surface portions are dissolved, and the upper surface 101 And a hardened layer (resin layer) of about 1 to 2 mm is formed on the lower surface 102.

  FIG. 9 is a cross-sectional view showing the vacuum forming process of the inner box having the partition wall of Patent Document 1. First, as shown in FIG. 9A, the heat insulating member 100 is set in advance in the vacuum forming mold 110, and then the plastic sheet 120 is heated and softened and formed by a vacuum forming method. Then, after the plastic sheet 120 is in close contact with the vacuum forming mold 110 and the heat insulating member 100 and cooled and cured in this state, the plastic sheet 120 is released from the vacuum forming mold 110, as shown in FIG. 9B. The inner box 130 is molded. That is, the heat insulating member 100 is configured as a partition wall in the inner box 130 by bringing the three side surfaces 103, 104, and 105 of the heat insulating member 100 shown in FIG. 8 into close contact with the inner wall surface of the inner box 130 formed by the plastic sheet 120. Is done. The inner box 130 is fitted into the outer box, and a foam foam insulating solution is formed by injecting a foam foam stock solution into a gap formed by the outer box and the inner box, thereby forming a refrigerator main body. It is said. Since the heat insulating member 100 has the upper surface 101 and the lower surface 102 as a hardened layer, the surface of the heat insulating member 100 has the same form as a part formed by molding a synthetic resin material by a so-called injection molding method. As it is, the sanitary structure can be obtained without being damaged by food or the like and without being infiltrated with juice or water.

Japanese Unexamined Patent Publication No. 63-197867

  However, in the structure of the inner box having the partition wall disclosed in Patent Document 1, the heat insulating member 100 cannot have the high load resistance necessary as the partition wall of the refrigerator. That is, the heat insulating member 100 is only adhered to the inner wall surface of the inner box 130 with the three side surfaces 103, 104, 105, and when a load is applied with food or beverage placed on the heat insulating member 100, Since the bonding area between the heat insulating member 100 and the inner box 130 is small, there is a problem that sufficient bonding strength cannot be obtained and the heat insulating member 100 may drop off.

  This invention is made | formed in order to solve the said subject, The objective is to provide the heat insulation box provided with the partition wall excellent in load resistance.

  In order to solve the above problems, the heat insulation box of the present invention is an heat insulation box provided with an inner box, an outer box, and a heat insulating material provided between the inner box and the outer box. The shelf includes a partition wall that divides the interior of the inner box into a plurality of spaces and an extending portion that extends in the vertical direction on the side of the partition wall, and the inner box includes a plurality of plate bodies and an extending portion. It is characterized by being.

  Further, the extending portion may extend downward in the vertical direction.

  Further, the extending portion may extend upward in the vertical direction.

  The inner box is a foam made of a thermoplastic resin, and the inner surface of the inner box may be compressed by applying heat to form a hard layer.

  Moreover, you may join an extending | stretching part to a heat insulating material and a plate.

  Moreover, at least two of the plurality of plate bodies may have a concave portion to which the extending portion is joined.

  The refrigerator of this invention is equipped with the heat insulation box as described above.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide a heat insulation box provided with the partition wall excellent in load resistance.

It is a perspective view which shows the heat insulation box which concerns on Embodiment 1. FIG. It is the schematic for demonstrating the manufacturing method of the inner box which concerns on Embodiment 1. FIG. It is the schematic for demonstrating the manufacturing method of the inner box which concerns on Embodiment 1. FIG. It is the schematic for demonstrating shaping | molding of the hard layer to the internal side surface of the inner box which concerns on Embodiment 1. FIG. It is the schematic for demonstrating the heat insulation box which concerns on Embodiment 2. FIG. It is the schematic for demonstrating the heat insulation box which concerns on Embodiment 3. FIG. It is the schematic for demonstrating the heat insulation box which concerns on Embodiment 4. FIG. It is a perspective view which shows the heat insulation member for partition walls of a prior art. It is sectional drawing which shows the vacuum forming process of the inner box which has a partition wall of a prior art.

Embodiment 1
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals and description thereof is omitted.

  FIG. 1 is a perspective view showing a heat insulation box according to the present embodiment. The heat insulating box 1 includes an inner box 10, a partition shelf 11, an outer box 21, and a heat insulating board 22. The inner box 10 is a rectangular parallelepiped foam whose one surface is open. The partition shelf 11 partitions the inside of the inner box 10 into two spaces in order to provide two storage chambers in the heat insulating box 1. The outer box 21 forms the outermost shell of the heat insulating box 1 and has a role of maintaining the strength of the heat insulating box 1, and here is a bent product of an iron plate. The heat insulating board 22 is a heat insulating material disposed between the inner box 10 and the outer box 21 in order to give the heat insulating box 1 sufficient heat insulation properties, and is made of foamed urethane or the like. The refrigerator according to the present invention is configured by incorporating into the heat insulation box 1 refrigeration cycle parts such as an evaporator and a compressor and electrical parts such as a control board and providing a heat insulation door. Although the heat insulation box 1 is provided with one partition shelf 11 for providing two storage chambers, it may be provided with two or more partition shelves 11 for providing three or more storage chambers.

  The partition shelf 11 is made of a foam, and includes a partition wall 11a that partitions the interior of the inner box 10 into two spaces, and an extending portion 11b that extends downward in the vertical direction on the side of the partition wall 11a. The inner box 10 is composed of a plurality of foam plates and extending portions 11b. As the foam plates, the upper surface portion 12, the lower surface portion 13, the side surface portions 14, 15, 16, 17 and the back surface portions 18, 19 are used. Have That is, the extending portion 11b has extending portions 11b on the left side and the right side of the partition wall 11a when the partition shelf 11 is viewed from the opening of the inner box 10, and each extending portion 11b includes the side surface portion 14 and the extending portion 11b, respectively. The side wall 16 and the side surface 15 and the side surface portion 17 are sandwiched and joined to form the side wall of the inner box 10. The heat insulating board 22 is bonded to the outer surface of the inner box 10, and the bonding area between the partition shelf 11 and the heat insulating board 22 can be increased by the extending portion 11 b, so that the adhesive strength of the partition shelf 11 can be increased. .

The foam is made of a thermoplastic resin, and polyethylene, polypropylene, polystyrene, ABS resin, polyethylene terephthalate, polyacetal, polyamide, or the like is used, and a closed-cell foam formed by a bead foaming method is suitable. Specifically, bead foamed polypropylene, bead foamed polyethylene, or the like is used. In the case of this embodiment, the foam has a foaming ratio of about 5 to 30 times. Moreover, the force which compresses a foam at the time of manufacture of a foam changes with foam materials, the temperature of the metal mold | die of thermoforming, and a foaming ratio. In the case of a bead-foamed polyethylene with an expansion ratio of 20 times and a mold temperature of 150 degrees Celsius, a pressing pressure of ² kg / cm ² is required, and an expanded polyethylene with an expansion ratio of 8 times has a mold temperature of 250 degrees Celsius. The press pressure of 5 kg / cm ² was required. This result is merely an example, and the processing conditions vary depending on the foam material used and the shape and size of the bubbles in the foam.

  The partition shelf 11 is made of a foam similar to that of the inner box 10 and may be a foam that is previously molded by a bead foaming method so as to have a partition wall 11a and an extending portion 11b. Alternatively, a foam in which the heated mold is pressed to form the partition wall 11a and the extending portion 11b may be used.

  A hard layer is formed on the inner surface of the inner box 10 and the surface of the partition wall 11a. The hard layer is formed by pressing a heated mold against the foam to melt and compress the surface of the foam and cooling the melted resin. Since the hard layer is smooth and high in strength, it is not damaged by food or the like, and it is easy to remove dirt and has a hygienic structure. In addition, since the hard layer can be integrally formed on the inner surface of the extending portion 11b and the side surface portion 16 and the inner surface of the extending portion 11b and the side surface portion 17, the boundary between the extending portion 11b and the side surface portion 16 and the extending portion 11b and the side surface portion 17 The boundary can be made inconspicuous. Furthermore, since the hard layer can be integrally formed on the inner surface of the extending portion 11b and the side surface portion 16 and the inner surface of the extending portion 11b and the side surface portion 17 on the lower side of the partition wall 11a, the partition wall 11a becomes strong against a load from vertically above. . Therefore, the partition wall 11a has sufficient load resistance for placing food or the like.

  Hereinafter, the manufacturing method of the heat insulation box 1 is demonstrated. 2 and 3 are schematic views for explaining a method for manufacturing the inner box 10. First, the manufacturing method of the inner box 10 is demonstrated using FIG.2 and FIG.3.

  FIG. 2A shows an outline of a state in which the inner box 10 is manufactured as viewed from above, and FIG. 2B is an outline of a cut surface along the line AA ′ in FIG. Is shown. First, along the fixing jig 32 fixed to the mounting table 31, each member of the partition shelf 11 and the inner box 10, that is, the upper surface portion 12, the lower surface portion 13, the side surface portions 14, 15, 16, 17 and the back surface portion 18. , 19 are temporarily assembled. The inner box 10 is manufactured with the opening facing downward. In the present embodiment, since the inner box 10 has two storage chambers, two fixing jigs 32 are illustrated, but the number of the fixing jigs 32 can be appropriately changed depending on the number of the storage chambers. The partition shelf 11 is arranged between the two fixing jigs 32, and each member of the inner box 10 is arranged along the fixing jig 32.

  The fixing jig 32 is constituted by a hollow square pipe such as aluminum, a frame, or the like, and is assembled by being fixed by welding or a bracket. The external dimensions of the fixing jig 32 are designed to be smaller than the internal dimensions when the inner box 10 is completed, and a plurality of types of fixing jigs 32 are required for each refrigerator model.

  FIG. 3A shows an outline of the state in which the inner box 10 is temporarily assembled as viewed from above, and FIG. 3B is a cross-sectional view taken along the line BB ′ in FIG. The outline of is shown. After the temporary assembly as shown in FIG. 3, the partition shelf 11, the upper surface portion 12, the lower surface portion 13, the side surface portions 14, 15, 16, 17, and the joining portions of the rear surface portions 18, 19 are respectively heat-welded tools 33. Use heat to weld and fix. As the heat welding method, vibration is applied by ultrasonic waves and the resin is melted and joined by frictional heat, or a heated metal plate is brought into direct contact with the joining surface, the melted surfaces are immediately aligned, and pressure is applied until cooling. There is a method of pressing and joining with. In this embodiment, bead foam polypropylene is used as the foam. The melting temperature of the bead-expanded polypropylene was 140 to 160 ° C., and the foam was heated up to this temperature with the hot welding tool 33, melted, adhered and fixed.

  After manufacturing the inner box 10, next, piping and wiring are arranged on the outer surface of the inner box 10, and the heat insulating board 22 is bonded. In this embodiment, a urethane foam board is used as the heat insulating board 22. The adhesive between the inner box 10 and the heat insulating board 22 is preferably an acrylic adhesive or a hot melt adhesive from the viewpoint of using for the purpose of storing food, with an emphasis on safety.

  Next, an adhesive sheet is temporarily fixed inside the outer box 21, and the outer box 21 is covered along the outer side of the heat insulating board 22. The outer box 21 is made of an iron plate having a thickness of about 1 mm. In the present embodiment, a hot melt adhesive is used for the adhesive sheet.

  As described above, the heat insulating box 1 can be manufactured by combining the inner box 10, the heat insulating board 22, and the outer box 21. Thereafter, the heat insulating box 1 is removed from the fixing jig 32, and a hard layer is formed inside the inner box 10.

  FIG. 4 is a schematic diagram for explaining the formation of the hard layer 40 on the inner side surface of the inner box 10. The hard layer forming apparatus 50 includes a mold 51, a mold support part 52 provided on the mold 51, and a hydraulic cylinder 53 provided on the mold support part 52, and forms the hard layer 40 on the inner surface of the inner box 10. To do. The hydraulic cylinder 53 moves the mold 51 and presses and presses the mold 51 against the inner surface of the inner box 10. Here, a support member that supports the heat insulation box body 1 (not shown) is provided outside the outer box 21 so that the heat insulation box body 1 is not damaged even if the mold 51 is pressed against the inner box 10 from the inside. Yes. The mold 51 has a cartridge heater (not shown) inserted therein, and the mold 51 is heated by the cartridge heater to melt the surface of the inner box 10. In addition, a liquid flow path (not shown) is formed inside the mold 51, cooling oil is supplied to the mold 51 to cool the melted resin, and the hard layer 40 is formed. .

  When the mold 51 is pressed and heated on the surface of the boundary between the extending portion 11b and the side surface portion 16, the melted resin is mixed and cooled in that state, whereby the integrated hard layer 40 can be formed. Similarly, an integrated hard layer 40 can be formed on the surface of the boundary between the extending portion 11 b and the side surface portion 17. Since the hard layer can be integrally formed on the inner surfaces of the extending portion 11b and the side surface portion 16 and the surfaces of the extending portion 11b and the side surface portion 17 on the lower side of the partition wall 11a, the partition wall 11a is resistant to a load from vertically above. Moreover, since the integrated hard layer 40 with which a boundary is not conspicuous can be formed, it is excellent also in aesthetics.

  By using the mold 51 having irregularities, the shape of the mold 51 can be molded as the shape of the hard layer 40. Although the description is omitted in the present embodiment, it is preferable that the side surface portions 14, 15, 16, and 17 are formed with unevenness that supports a shelf for placing food or the like.

  In FIG. 4, four molds 51 are pressed against the surfaces of the side surface portion 14, the side surface portion 15, the side surface portion 16 and the extending portion 11 b, and the side surface portion 17 and the extending portion 11 b, respectively, to form the hard layer 40. However, the upper surface portion 12, the lower surface portion 13, the back surface portion 18, the back surface portion 19, and the upper surface of the partition wall 11a and the lower surface of the partition wall 11a can similarly form the hard layer 40. When the hard layer 40 is formed on the upper and lower surfaces of the partition wall 11a, the partition wall 11a may be distorted unless the mold 51 is pressed with equal pressure from above and below the partition wall 11a. Since the load resistance is excellent, the partition wall 11a can be prevented from being damaged due to a large pressure from above.

  In this embodiment, although the partition shelf 11 which has the extending | stretching part 11b extended perpendicularly downward was demonstrated, not only this but the structure upside down may be sufficient. That is, the partition shelf 11 is preferably strong against a load from vertically above from the viewpoint of placing and using food, beverages, etc., and preferably has an extending portion 11b extending vertically downward, but with high adhesive strength. As long as sufficient load resistance can be provided, a configuration having an extending portion extending vertically upward may be used.

  In this embodiment, the partition shelf 11 has the extending portion 11 b in the portion joined to the side surface portion 16 and the side surface portion 17, but the portion joined to the back surface portion 19 may further include an extending portion.

  As described above, the heat insulation box of the present embodiment has an extending portion extending in the vertical direction on the side of the partition wall, and the extending portion constitutes a part of the inner box and is joined to the heat insulating board. Moreover, since the adhesive layer has high strength and a hard layer integrated with the extending portion and the side surface portion can be formed below the partition wall, the load resistance is excellent.

[Embodiment 2]
Next, Embodiment 2 of the present invention will be described with reference to FIG. In addition, about the component which has the function structure substantially the same as Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 5 is a schematic view for explaining the heat insulation box of the present embodiment. The heat insulation box 2 includes an inner box 60, a partition shelf 61, an outer box 21, and a heat insulation board 22. In the same manner as in the first embodiment, the partition shelf 61 includes a partition wall 61a that partitions the interior of the inner box 60 into two spaces, and an extending portion 61b that extends downward in the vertical direction on the side of the partition wall 61a. It has the extending | stretching part 61c extended vertically upward in the side. The inner box 60 includes an upper surface portion 12, a lower surface portion 13, side surface portions 14, 15, 16, and 17, rear surface portions 18 and 19, and extending portions 61b and extending portions 61c. Since the partition shelf 61 includes the extending portion 61b and the extending portion 61c, the adhesion area with the heat insulating board 22 can be further increased. For this reason, the partition shelf 61 can be more firmly fixed than in the first embodiment. In addition, since the hard layer 40 integrated with the extending portion 61c and the side surface portion 14 and the extending portion 61c and the side surface portion 15 can be formed on the upper side of the partition wall 61a, the force applied from the vertically lower side becomes strong. Even when food or the like is lifted, the partition wall 61a can be prevented from being damaged even if it hits the partition wall 61a from below. Furthermore, since it is strong against not only the load from above but also the load from below, it is possible to prevent the partition wall 61a from being damaged when the hard layer 40 is formed on the upper and lower surfaces of the partition wall 61a, and to the partition wall 61a. The hard layer 40 can be easily formed.

[Embodiment 3]
Next, Embodiment 3 of the present invention will be described with reference to FIG. In addition, about the component which has the function structure substantially the same as Embodiment 1 or 2, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 6 is a schematic view for explaining the heat insulation box of the present embodiment. The inner box 70 of the heat insulating box 3 includes an upper surface portion 12, a lower surface portion 13, side surface portions 71 and 72, a back surface portion 73, and an extending portion 11b. The side part 71 and the side part 72 have the recessed part 71a and the recessed part 72a which the extending part 11b joins, respectively. The extending portion 11b is fitted into the recessed portion 71a and the recessed portion 72a and is heat-welded. Since the partition shelf 11 has the extending portion 11b, the adhesion area between the side surface portion 71 and the side surface portion 72 is large. Moreover, since the hard layer 40 integrated with the extending | stretching part 11b and the side part 71 and the extending | stretching part 11b and the side part 72 can be formed similarly to Embodiment 1, it is excellent in load resistance. Furthermore, similarly to the second embodiment, the partition shelf 11 may further include an extending portion that extends vertically upward.

  The heat insulation box 3 assembles the inner box 70 by arranging the upper surface portion 12, the lower surface portion 13, the side surface portion 71, the side surface portion 72, and the back surface portion 73 along one fixing jig, and the heat insulation board 22 and the outer box 21. After the combination, the fixing jig is removed, the partition shelf 11 is inserted into the inner box 70, and a hard layer is formed on the inner surface of the inner box 60.

  The side surface portion 71 and the side surface portion 72 may use a foam having a recess 71a and a recess 72a in advance, respectively, but after assembling using a foam that does not have the recess 71a and the recess 72a, go to the inner box 70. Before inserting the partition shelf 11, you may make it insert the partition shelf 11, after pressing the heated metal mold | die to the side part 71 and the side part 72, and forming the recessed part 71a and the recessed part 72a.

  In the present embodiment, since the number of members constituting the inner box 70 can be reduced, the manufacturing process of the inner box 70 can be reduced.

[Embodiment 4]
Next, Embodiment 4 of the present invention will be described with reference to FIG. In addition, about the component which has the function structure substantially the same as Embodiment 1-3, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 7 is a view for explaining the heat insulating box of the present embodiment. The heat insulation box 4 includes an inner box 80, a partition shelf 81, an outer box 21, and a heat insulation board 22. The partition shelf 81 includes a partition wall 81a that partitions the inside of the inner box 80, and an extending portion 81b that extends vertically downward on the side of the partition wall 81a. The extending portion 81 b is joined to the side surface portions 14, 15, 82, 83 and the heat insulating board 22. The extending portion 81b is formed obliquely so that the thickness increases from the lower surface of the partition wall 81a to the joint surface with the heat insulating board 22. The inner box 80 includes an upper surface portion 12, a lower surface portion 13, side surface portions 14, 15, 82, 83, rear surface portions 18, 19, and an extending portion 81b. The side part 82 and the side part 83 are joined to the partition wall 81a so as to cover from the inside. The partition shelf 81 has a large bonding area with the side surface portion 82, the side surface portion 83, and the heat insulating board 22 due to the extending portion 81 b, so that the bonding strength can be increased. Further, since the extending portion 81b is covered with the side surface portion 82 and the side surface portion 83 from the inside, the partition shelf 81 is difficult to drop off and is strong against a load from above in the vertical direction.

  The partition wall 81a may have an extending portion that extends vertically upward. Similarly to the extending portion 81b, the partition wall 81a has an extending portion that is formed obliquely so as to increase in thickness with respect to a portion joined to the heat insulating board 22. You may have. In that case, similarly to the side surface portion 82 and the side surface portion 83, the side surface portion 14 and the side surface portion 15 are joined so as to cover the extending portion from the inside.

  As described above, the heat insulating box of the present invention includes a partition wall that partitions the interior of the inner box into a plurality of spaces and a partition shelf that extends in the vertical direction on the side of the partition wall, and the extension portion is Since it constitutes a part of the inner box, it has excellent load resistance.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and the embodiments can be obtained by appropriately combining technical means disclosed in different embodiments. The form is also included in the technical scope of the present invention.

1, 2, 3, 4 Heat insulation box 10, 60, 70, 80 Inner box 11, 61, 81 Partition shelf 11a, 61a, 81a Partition wall 11b, 61b, 61c, 81b Extension part 21 Outer box 22 Heat insulation board 40 Hard layer

Claims (7)

An inner box, an outer box, and a heat insulating box provided with a heat insulating material provided between the inner box and the outer box,
The heat insulation box includes a partition shelf,
The partition shelf includes a partition wall that partitions the interior of the inner box into a plurality of spaces, and an extending portion that extends in a vertical direction on the side of the partition wall,
The inner box is composed of a plurality of plates and the extending portion, and is a heat insulating box.   The heat insulation box according to claim 1, wherein the extending portion extends downward in the vertical direction.   The heat insulating box according to claim 1 or 2, wherein the extending portion extends upward in the vertical direction.   The inner box is a foam made of a thermoplastic resin, and the inner surface of the inner box is compressed by applying heat to form a hard layer. The heat insulation box as described in any one.   The said extending | stretching part is joined to the said heat insulating material and the said board, The heat insulation box as described in any one of Claim 1 to 4 characterized by the above-mentioned.   6. The heat insulation box according to claim 1, wherein at least two of the plurality of plates have a concave portion to which the extending portion is joined. The refrigerator provided with the heat insulation box as described in any one of Claim 1 to 6.