JP3093942B2 - Thermal insulation box and method of manufacturing the same - Google Patents

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 used for an ice storage box for a refrigerator or an ice machine, and more particularly to a structure and a manufacturing method thereof.

[0002]

2. Description of the Related Art A refrigerator or an ice storage box uses an insulating box mainly composed of an inner box, an outer box surrounding the inner box, and a heat insulating material between the two boxes. It has been proposed that the inner box and the outer box are integrally molded in consideration of manufacturability and appearance, and a heat insulating material is formed from a foamed resin.
-62988). This will be briefly described with reference to the drawings. In FIGS. 11 and 12, an ice storage unit 1 of an ice maker in which an ice maker unit (not shown) is mounted above,
It has a box shape with an open top and a closed bottom. The inner box 3 and the outer box 5 are manufactured by integral molding of resin, and are connected by a connecting portion 7 that is discontinuous in a plane. Insulation wall 9a and insulation floor 9 along the outer surface of inner box 3
b are formed respectively, and are manufactured from a foamed resin as described later. At the upper end of the outer box 5, there is a groove 11, into which a cabinet (not shown) is fitted. A mounting portion 13 is fixed to the upper end of the inner box 3 with rivets, and is used for mounting an ice making unit (not shown). The inlet of the drain pipe 15 stands in the inner box 3.

In order to form the ice storage unit 1 having the above-described heat insulating structure, a heat insulating material layer (a heat insulating material wall 9a and a heat insulating material floor 9b) is formed according to the following procedure. That is, 1. The inner box 3 and the outer box 5 (formed body), which have been integrally formed in advance, are set upside down in the lower mold 17 of the foaming jig as shown in FIG. At that time, foam leak-proof tape 19, 2
1 is stuck on the entire periphery along the upper edge end surface and the inner peripheral surface of the lower edge of the outer box 5. 2. A liquid foamed resin is injected into the spaces (9a, 9b) where the heat insulating material layer is formed. 3. Before foaming starts, the upper mold 23 of the foaming jig is quickly closed, and the lower mold 17 and the upper mold 23 are clamped so as to withstand the foaming pressure. 4. When the state is maintained for a predetermined time, foaming is performed in the foaming jig, and the heat insulating material wall 9a and the heat insulating material floor 9b are obtained.

[0004]

In the above manufacturing procedure, a tape is applied to prevent foam leakage.
Leaks cannot be completely prevented. Once foaming leakage occurs,
The leaked foam resin adheres to the outer surface of the outer box 5 of the ice storage unit 1 (FIG. 1).
1 is indicated by Z. ), The foamed liquid contains a component that dissolves the main body resin, so that the soiled portion cannot be separated and corrected. For this reason, they have to be discarded, the defect rate increases, and the overall manufacturing cost increases. Furthermore, when foaming leakage occurs, the foaming jig becomes dirty, so it is necessary to frequently perform disassembly and cleaning, thereby improving mass productivity.
This hindered the improvement of the operation rate of the equipment. As a countermeasure, the use of a normal resin plate or a thin zinc-iron plate that covers the entire space of the heat insulating material floor 9b instead of the leakage prevention tape 21 has been considered, but in any case, foam leakage can be completely prevented. Instead, a leak-proof tape similar to the conventional one was required at the joint between the plate and the molded body. Therefore, an object of the present invention is to provide a structure and a method for manufacturing the same that can easily prevent foam leakage when manufacturing a heat insulating box having a heat insulating material layer made of a foamed resin.

[0005]

According to the present invention, in order to achieve the above object, according to the present invention, an inner box defining a storage space therein and having one open side, and a non-opening surface of the inner box are provided. surround and
An outer box having both openings , and a heat-insulating box having an insulating material-filled space defined by the outer box and the inner box and having one surface facing the outside through the openings,
Cover with a heat-insulating material covered with a compression-elastic laminated plastic plate.
The surface facing the outside of the filling space is closed, and a foamed resin is injected and filled into the closed heat insulating material filling space. The compression-elastic laminated plastic plate is made of a plastic made of at least two plastic plates arranged in parallel at intervals and a plurality of thin plastic plates formed at intervals between the plastic plates. It is preferred to use cardboard, so-called plastic cardboard. Further, according to another aspect of the present invention, an inner box defining a storage space therein and having one open side, and an outer box having an opening and surrounding the non-opening surface of the inner box. If, one surface defined by the outer box and the inner box is pre
In manufacturing an insulating box having an insulating material filling space facing the outside through the opening , the inner box and the outer box are set in a void in a foaming jig, and the outer box is placed outside the insulating material filling space. A compression elastic laminated plastic plate is sandwiched between the surface and the foaming jig, and the injected liquid resin is foamed in the space filled with the heat insulating material. As the compression elastic laminated plastic plate, it is preferable to exhibit sufficient elasticity against a load in the plate thickness direction, and the above-mentioned plastic cardboard is suitably used.

[0006]

According to the present invention, the molded body of the inner box and the outer box is set in the lower mold of the foaming jig so that the surface facing the outside of the heat insulating material filling space is located upward. A compression-elastic laminated plastic plate is sandwiched between the surface facing the outside and the upper mold of the foam jig so as to close the heat-insulating material filling space defined by the box and the outer box. The injection of the liquid foamed resin may be performed before or after the sandwiching, but in the latter case, an appropriate injection hole is provided. Since the plastic plate thus sandwiched is pressed and compressed by the upper mold of the foaming jig,
The gap between the non-bonded surfaces, which deforms well and causes foam leakage, is completely eliminated. When plastic cardboard is used as the compression elastic laminated plastic plate, even if a gap remains at the joint surface between the outer box and the plastic cardboard and foam leakage occurs, the leaked foam resin enters the intermediate space of the plastic cardboard and enters the outside Do not leak to

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the attached drawings, the same reference numerals are given to the same portions including those relating to the above-mentioned conventional technology. First, FIG. 1 shows a state in which an ice storage section of an ice making machine as described above is manufactured. In FIG. 1, the outer box 3 and the outer box 5 are integrated by a connecting portion 7, and a molded body 10 is formed.
Is composed. The molded body 10 is set in a lower mold 17 of a foaming jig such that the bottom plate 3a of the inner box 3 is directed upward. Between the upper edge 8 of the outer box 5 and the lower mold 17, a suitable interposer 1
8 is placed. Thereafter, a liquid foamed resin is injected into the heat insulating material filling space 31. Then, before foaming starts, the plastic cardboard, that is, the plastic cardboard 33 is put into the outer box 5.
Is placed on the inner peripheral shelf 5a, and the upper mold 23 of the foaming jig is quickly placed thereon to perform mold clamping. If you keep this state,
The above-mentioned liquid foamed resin foams and spreads into the heat-insulating material filling space 31 to form a heat-insulating material wall or a heat-insulating material floor.

FIG. 2 shows details of the plastic cardboard 33. In the figure, thin plastic plates 35, 37 are arranged in parallel, between which plastic thin plates 39 extend parallel to one another with a large number of intervals. The plastic flat plates 35 and 37 and the plastic thin plate 39 are integrally molded and manufactured.
Are formed a large number of elongated spaces 41 having a rectangular cross section. Since the plastic corrugated cardboard 33 is formed in this manner, the plastic flat plates 35 and 37 having suitable compression elasticity and rigidity are provided on the surface of the inner peripheral shelf 5a of the outer box 5 and the upper mold 2.
The formation of a gap that causes foaming leakage is prevented by closely following the surface of No. 3. Even if it should leak, the leaked foamed resin does not leak outside because it flows into the space 41. This is shown in FIG. FIG. 3 shows a case in which the size of the plastic cardboard 33 is made small and the gap between the end and the outer box 5 is large. 33 flows into the space 41. With emphasis on such a phenomenon, as shown in FIG. 4, the plastic cardboard 133 may be formed so as to omit the plastic thin plates 39 at both ends and to guide the leaked foam resin there.

Further, three plastic flat plates 235 and 23 like a plastic cardboard 233 shown in FIG.
6 and 237 may be arranged at intervals and in parallel with each other, and a plurality of plastic thin plates 238 and 239 may be arranged in parallel and at intervals with each other. Plastic sheet 238 and plastic sheet 23
9 extend in directions intersecting each other.

The above embodiment describes the case of manufacturing an ice storage section of an ice making machine which is a heat insulating box according to the present invention. However, plastic corrugated cardboard is used as a rear plate or a bottom plate of an invisible portion of the heat insulating box. A state in which the foamed resin is injected after the plastic cardboard is used will be described using a refrigerator as an example. In FIG. 6, the exterior (outer box) 42 and the interior (inner box) 43 of the refrigerator are shown in cross section, and both are connected by a joiner 45. In manufacturing, the exterior 41 is surrounded by an outer jig 47 of a foaming jig, and the interior 43 is supported from the inside by an inner jig 49. A heat insulating material filling space 51 is formed between the exterior 41 and the interior 43, and a plastic cardboard 53 is disposed at a position outside the exterior 42 without the exterior 42. As shown in FIGS. 7 and 8, an injection hole 55 is formed in the plastic cardboard 53, and a plastic film 5 is formed inside the injection hole 55.
7 is attached so as to be openable and closable. The plastic film 57 closes the injection hole 55 after the foamed resin foams as described later.

The injection hole 55 of the plastic cardboard 53
Are aligned with the injection holes 47a of the outer jig 47. As shown in FIG. 6, an appropriate injection tube of an injector 61 is inserted, and a liquid foamed resin is injected into the heat insulating material filling space 51. . When the injection operation is completed, the injector 61 is pulled out, and the foamed resin foams in the heat-insulating material filling space 51, and a part of the resin spreads out from the injection hole 55 through the space between the plastic film 57 and the plastic cardboard 53. To try. Such a leaky foamed resin also has its properties, and as shown by the arrow in FIG.
Flow between 8,59 and stay there. That is, the foamed resin does not leak out of the plastic cardboard 53. In the conventional case using a normal plastic plate or a zinc iron plate in place of the plastic cardboard 53, the leaked foamed resin invades between the plate and the outer jig, causing a problem. Nothing happens. As shown in FIGS. 9 and 10, it is preferable to use plastic cardboards 153 and 253 having vent holes as shown in FIGS. 9 and 10, an oval air hole 161 is formed in the plastic plate 159 above the plastic cardboard 153, and a plurality of circular air vent holes 2 are formed in the plastic plate 259 above the plastic cardboard 253.
61 are respectively formed.

[0012]

As described above, according to the first aspect of the present invention, the compression elastic laminated plastic plate is properly pressed by the foaming jig into the outer box defining the heat insulating material filling space. As a result, the gap between the outer box and the laminated plastic plate is completely eliminated, so that leakage of the foamed resin does not occur. According to the second aspect of the present invention, the plastic cardboard used as the compression elastic laminated plastic plate has a space inside and is itself beautiful, strong and water-resistant, so that there is no leakage of foamed resin. However, it is kept in the space and does not go outside, and at the same time protects the heat insulating material as a beautiful protective member. Furthermore, according to the third aspect of the present invention, since a gap that causes leakage of the foamed resin can be eliminated by using one compression elastic laminated plastic plate, workability is good, and production is performed efficiently and in a short time. Can be. Further, according to the invention of claim 4, the plastic cardboard is:
Since it has the above-mentioned characteristics, it can be left as it is as a protection member of the heat insulating material, so that the workability is further improved and the leakage of the foamed resin can be completely prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing a main part of the embodiment.

FIG. 3 is a partially enlarged view illustrating the operation of the embodiment.

FIG. 4 is a partially cutaway perspective view showing a main part of a partial modification of the embodiment.

FIG. 5 is a partially broken perspective view showing a main part of still another partial modification of the embodiment.

FIG. 6 is a sectional view showing a second embodiment of the present invention.

FIG. 7 is an enlarged sectional view of a main part of FIG. 6;

FIG. 8 is an enlarged perspective view of a main part of FIG. 6;

FIG. 9 is a perspective view showing a partially modified example of the second embodiment.

FIG. 10 is a perspective view showing another partial modification of the second embodiment.

FIG. 11 is a perspective view showing a conventional one.

FIG. 12 is a vertical sectional view showing a cross section of a conventional one.

FIG. 13 is an elevational sectional view showing a method for manufacturing a conventional device.

[Explanation of symbols]

3 ... Inner box, 5 ... Outer box, 9a ... Insulation material wall, 9b ... Insulation material floor, 10 ... Molded body, 17 ... Lower mold, 23 ... Upper mold, 31 ... Insulation material filling space, 33 ... Plastic cardboard, 35 ... plastic flat plate, 37 ... plastic flat plate, 41 ... space, 42 ... exterior (outer box), 43 ... interior (inner box), 47 ...
Outer jig, 48 ... Inner jig, 51 ... Insulation material filling space, 53 ...
Plastic corrugated cardboard, 58 ... plastic flat plate, 59
... plastic plate, 133 ... plastic cardboard,
153: plastic cardboard, 253: plastic cardboard.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F25D 23/08

Claims (4)

(57) [Claims] 1. An inner box defining a storage space therein and having an open side, and a non-open surface of the inner box and an opening formed therein.
A heat-insulating box body having an outer box provided, and a heat-insulating-material-filled space defined by the outer box and the inner box and having one surface facing the outside through the opening.
Place the heat-insulating material filled empty plastic
A heat-insulating box, wherein a surface facing the outside is closed, and a foamed resin is injected and filled in the closed heat-insulating material filling space. 2. A compression elastic laminate made of a plastic cardboard made of at least two plastic plates arranged in parallel at intervals and a plurality of plastic thin plates formed at intervals between the plastic plates. The heat insulation box according to claim 1, wherein a plastic plate is formed. 3. An inner box having a storage space defined therein and one side open, and an opening portion surrounding the non-opening surface of the inner box.
In producing an insulating box body having an outer box provided and an insulating material filling space defined by the outer box and the inner box and having one surface facing the outside through the opening , the inner box and the outer box are foamed. It is set in a closed space in a jig, a compression elastic laminated plastic plate is sandwiched between a surface facing the outside of the heat insulating material filling space and a foaming jig, and a liquid injected in the heat insulating material filling space. A method for producing a heat-insulating box, characterized by foaming a resin. 4. A compression elastic laminate made of a plastic cardboard made of at least two plastic plates arranged in parallel at intervals and a plurality of plastic thin plates formed at intervals between said plastic plates. The method for producing a heat insulating box according to claim 3, wherein the method is used as a plastic plate.