JPH08114381A - Heat insulation box and manufacture thereof - Google Patents

Abstract

PURPOSE: To prevent the occurrence of a burr of a foamed resin, chemical attack, etc., in a heat insulation box formed by filling foamed resin in a body having an inner box and an outer box. CONSTITUTION: An ice storage box 10 is formed of an inner box 11 and an outer box 13 by an integral mold, a molding resin member 15 is inserted between the open edge 11a of the box 11 and the opening edge of the box 13, and brought into close contact with the inner surfaces of the boxes 11 and 13. Heat insulation foamed resin formed by foaming injected foaming liquid is filled in a sealed space 17 between the boxes 11 and 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating structure or a heat insulating box used for a refrigerator or an ice storage box for an ice making machine, and more particularly to a structure for preventing leakage of foamed resin constituting a heat insulating material and a structure thereof. The present invention relates to a method for manufacturing an insulation box.

[0002]

2. Description of the Related Art In refrigerators, ice storage boxes of ice makers, and the like, a heat insulating structure is employed to block heat transfer between an internal space and an external space. When there is an outer box on the outermost side and an inner box on the innermost side, a heat-insulating structure can be formed by injecting a foaming liquid (resin) between them to foam them (JP-A-3-148580). However, in the case where the heat insulating resin layer is formed on one of the inner box and the outer box, for example, the outer box is not on the outermost side, and the outer box or a portion without the outer box (JP-A-62-141478)
Use a jig. This will be described with reference to FIG. 8. An outer box 3 is arranged outside the inner box 1 at a distance from it to form a main body, or is formed by integral molding to form a main body. The main body consisting of and is set in the foaming jigs 5 and 7. Then, the foaming jigs 5 and 7 are clamped, and the space between the inner box 1 and the outer box 3 and between the inner box 1 and the foaming jigs 5 and 5.
A foamable liquid (resin) is filled in the space between the resin and the resin 7, and foamed to form a heat insulating material. At this time, a release agent such as oil or grease (silicone) or silicone is applied to the inner surface 7'of the foaming jig 7 which is in contact with the foamable liquid.

[0003]

As described above, when the outer box or the inner box and the jig are combined to form the pressure boundary of the foaming liquid injecting space, the foaming pressure is considerably high, so that the liquid flows from the gap between the two. It will leak and burr. The so-called deburring work for removing this burr took a considerable amount of time and labor. Further, when the outer box is made of resin, the leaked liquid adheres to the outer box and cannot be separated, and is discarded as a defective product. Also,
If a release agent is used on the inner surface of the jig with which the foamed resin is in contact, a resin attack may occur, which may cause cracks or stains on the main body resin after a long period of time. Further, since the mold release agent stains the resin of the main body, it requires considerable attention and attention to the coating work, and a considerable amount of time and effort is spent. Therefore, it is an object of the present invention to provide a heat insulating box having a structure in which a foamable liquid resin does not leak even when a foam resin insulating material is formed around an inner box using a jig, and a method for manufacturing the same. And

[0004]

In order to achieve the above object, according to the present invention, a heat insulating box includes an inner box, an outer box surrounding the inner box, and the inner box. Of the molded resin member that closes the opening defined by the open edge of the outer box and the open edge of the outer box and is in close contact with the inner surfaces of the inner box and the outer box, and the sealed space between the inner box and the outer box. It is composed of foam resin. Further, according to the present invention, a cavity communicating with the closed space between the inner box and the outer box and opened facing one of the inner box and the outer box is formed inside the molded resin member. Furthermore, according to the manufacturing method of the present invention, an opening defined by the open edge of the inner box and the open edge of the outer box surrounding the inner box is closed with a molding resin member, and the inner box, the outer box, and A molded resin member is placed in a foaming jig, and a foamed resin is injected and filled into a space defined by the inner box, the outer box and the molded resin member.

[0005]

According to the present invention, the molded resin member is arranged between the open edge of the inner box and the open edge of the outer box. In this way, both ends of the molded resin member are brought into close contact with the inner surfaces of the inner box and the outer box, respectively, and supported by the outer jig. Therefore, even if the foamed resin is injected in a liquid state and the foaming pressure of the injected liquid (resin) is generated, the molded resin member is brought into close contact with the inner box and the outer box, and no gap is created, so that the injected liquid is used by an external jig It does not leak to the side. In particular, when a void is formed inside the molded resin member, the injected liquid resin is introduced into the void and is foamed / filled to serve as a heat insulating material, whereby good heat insulating performance is obtained. Further, the foaming pressure in the void presses the molded resin member against the inner box or the outer box, so that the contact between the two becomes tighter and the injected liquid is confined in the inner box, the outer box and the molded resin part.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. First, in FIG. 1, the inner box 11 and the outer box 13 of the ice storage box body 10 are connected to each other via connecting members 12 and 14, and are integrally molded. The inner box 11 and the outer box 13 are in the shape of a box whose upper part is open, and further, the upper part of the front face is cut open. Connecting members 12, 14
Are plate-shaped, and a plurality of are formed at intervals along each side of the bottom plate portion 11 b of the inner box 11. Further, the open edge 11a of the inner box 11 extends upward (in the figure) from the open edge 13a of the outer box 13, but this is for facilitating the release of the integral molding die. Same as open edge 11a
A molded resin member 15 is densely inserted between 3a, and its lower end is adjacent to the upper portions of the connecting members 12 and 14. The molded resin member 15 includes an outer box 13 and an inner box 11a.
A closed space 17 is defined between them. Molded resin member 1
5 is made of a material such as expanded polystyrene or urethane, and may have an integral structure or a divided assembly structure as described later. Although the inner box 11 and the molded resin member 15 are adhered by welding, they may be adhered or glued. The lower opening of the outer box 13 is closed by a bottom plate 19 that is adhered or screwed. Such an ice storage box body 10 is set in a foaming jig (not shown), and a foaming liquid (resin) is introduced into the closed space 17 through the hole of the bottom plate 19.
Is injected, and this is foamed and filled into a heat insulating material. The front frame 21 is attached after foaming.

Since styrofoam and the like have a slightly inferior heat insulation performance than urethane-injected foam, the molded resin member may be constructed as follows. That is, as shown in FIG. 2, a void is formed inside the molded resin member 115, and this void faces the outer surface of the inner box 111 of the ice storage box body 110. Body 110
Is formed from an inner box 111 and an outer box 113 as in the case of the main body 10 described above.
The volume of 7 is larger than that of the closed space 17 described above. As described above, the molded resin member 115 has a divided assembly structure including a rear plate 115a, a front plate 115b, a right side plate 115c, and a left side plate 115d, as shown in FIG.
Particularly in FIG. 3, it is clearly shown that the rear plate 115a and the left side plate 115d form hollows 117a and 117b, respectively. The front plate 115b and the right side plate 115c, whose inner sides are hidden and invisible, also form similar voids. The molded resin member 115 configured as described above is shown in FIG.
Is assembled as shown in FIG. 3 to define a closed space 117, and the foamed resin is injected and filled in the liquid state into the closed space 117. This state is shown in FIG.

In FIG. 4, a main body 110 having an inner box 111 and an outer box 113 is set between the foaming jigs 105 and 107, and a foaming liquid is injected as shown by an arrow A. This liquid immediately foams and forms a void 11 in the rear plate 115a.
7a also penetrates into the void inside the molded resin member 115 and becomes foamed resin. At this time, as shown by arrows P and R, a foaming pressure acts on the rear plate 115a and the front plate 115b to press them against the inner surface of the outer box 13. The foaming pressure similarly acts on the right side plate 115c and the left side plate 115d. In this way, the molded resin member 115 and the outer box 113 are brought into close contact with each other,
No foamable liquid or foamed resin leaks from between these. The foaming pressure also acts on the side portions of the voids of the rear plate 115a, the front plate 115b, the right side plate 115c, and the left side plate 115d, so that the adjacent plates are pressed against each other to eliminate the gap between them. In the case of this embodiment, unlike the case of FIG. 1, the inner box 111 and the molded resin member 115 are not bonded, but the injected foaming liquid itself that has entered between the two functions as an adhesive. In addition, as a matter of course, the molded resin member 115
Also functions as a heat insulating material.

In the embodiment shown in FIGS. 2, 3 and 4, the molded resin member 115 has a structure in which it is divided into four pieces, but it may have a three-piece structure or an integral structure as will be described below. That is, in FIG. 5, the ice box body 110 is the same as the previous one, and the molded resin member 215 is the right side plate 215a.
It is made up of a left side plate 215b and a front plate 215c. The right side plate 215a is bilaterally symmetrical to the left side plate 215b, and each of them also serves as a part of the rear plate 115a of the second embodiment. The front plate 215c has the same shape as the front plate 115b of the second embodiment. In FIG. 6, the molded resin member 315 is in the shape of a box without a bottom.
Its vertical cross section is shown in FIG.

Although not described in the above description of the individual embodiments, the molded resin members 15, 115, 215, 315 can significantly reduce hygroscopicity when subjected to silicon coating treatment or paraffin treatment. Therefore, it may function as a moisture barrier in this way. Further, the above-mentioned molded resin member is made of styrofoam, but other materials such as rubber or sponge may be used. In this case, since the rigidity is small and it is easy to bend, a required number of reinforcing ribs are integrally formed on the inner surface side forming the void to prevent the collapse.

[0011]

As described above, according to the first aspect of the present invention, since the molded resin member is inserted between the inner box and the outer box and closely adheres to them, the foamed resin is prevented from leaking to prevent burrs. Occurrence can be prevented. Further, since the molded resin member prevents the foamed resin from directly contacting the foaming jig, it is possible to prevent various conventional problems associated therewith. Further, according to the second aspect of the present invention, since the foamed resin enters the void inside the molded resin member, the heat insulation performance of this portion can be preferably maintained, and the molded resin member is formed by the foaming pressure of the entered resin foam. Since it is pressed against one of the inner box and the outer box to be in close contact with it, leakage can be completely prevented. Further, according to the invention of claim 3, the above-mentioned effect is obtained and the open edge of the inner box extends outwardly more than the open edge of the outer box, which is convenient for die-cutting at the time of integral molding. ,
Insulation box can be manufactured at low cost as a whole. Further, according to the method invention of claim 4, the heat insulating box as described above can be efficiently manufactured.

[Brief description of drawings]

FIG. 1 is a cutaway perspective view including a cross section of a main part of a first embodiment of the present invention.

FIG. 2 is a cutaway perspective view including a cross section of a main part of a second embodiment of the present invention.

FIG. 3 is an exploded perspective view of the second embodiment.

FIG. 4 is a cross-sectional view illustrating the manufacturing process of the second embodiment.

FIG. 5 is an exploded perspective view of another embodiment of the present invention.

FIG. 6 is a perspective view of yet another embodiment of the present invention.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a cross-sectional view showing an example of a conventional one.

[Explanation of symbols]

10 ... Ice storage box main body, 11 ... Inner box, 11a ... Open edge, 13
... Outer box, 13a ... Open edge, 15 ... Molded resin member, 110
… Ice box body, 111… Inner box, 113… Outer box, 115…
Molded resin member, 215 ... Molded resin member, 315 ... Molded resin member

Claims (4)

[Claims] 1. An inner box, an outer box surrounding the inner box, and an opening defined by an open edge of the inner box and an open edge of the outer box are closed to close the inner box and the outer box. A heat-insulating box comprising a molded resin member that is in close contact with the inner surface and a foamed resin filled in a closed space between the inner box and the outer box. 2. A molded resin member is formed with an open space facing one of an inner box and an outer box inside, and a foamed resin is introduced into the empty space. The heat insulation box described in 1. 3. The heat insulation box according to claim 1, wherein an open edge of the inner box extends outwardly from a surface defined by the open edge of the outer box. 4. An opening defined by an open edge of the inner box and an open edge of the outer box surrounding the inner box is closed with a molding resin member,
The inner box, the outer box and the molded resin member are arranged in a foaming jig, and the foamed resin is injected and filled into a space defined by the inner box, the outer box and the molded resin member. Item 1. A method for manufacturing an insulating box according to Item 1.