JPS59100379A - Heat-insulating box body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of the Invention The present invention relates to a heat insulating box body formed by foam-filling a heat insulating material between an outer box and an inner box.

(B) Problems with Background and Background Art A conventional heat insulating box (1) of this kind, for example, used as the main body of a refrigerator, is shown in FIG. (2) is an outer box made of steel plate, with a top surface (3a), left and right sides (3b), (3c) (
3) The rear opening of the cabinet constituting the cabinet is closed with the back plate (4), and the lower opening is closed with the bottom plate (5) and opened forward 1.
It forms a box body. In Fig. 2, (6) is a box-shaped inner box that is thermoformed with thermoplastic resin and opens at the front.
) is formed and incorporated. In this state, tilt the front opening downward as shown in Figure 2, insert the injection nozzle (9) through the injection port (8) formed in the bottom plate (5), and pour the foaming insulation material stock solution (10a) such as polyurethane. is injected in the interval (direction). In this state, the stock solution (10a) is foamed by applying a foaming jig (not shown). The foaming reaction of the stock solution (10a) first occurs in the outer box (2) and the inner box (6). It starts from the opening and gradually rises towards the back plate (4).

Here, the air that exists in the direction (direction) is on the back plate (
4) It is gradually discharged from the exhaust hole 0υ drilled in the upper part.

The foaming of the stock solution (10a) progresses and finally ends at the back plate (4), and the insulation material (101) adheres to the outer box (2) and inner box (6) as shown in Figure 3. The bubbles generated in the heat insulating material (10) during foaming are small near the opening, and become larger as they approach the back plate (4). The bubbles in the IQI become very large.Also, during foaming or immediately after filling the insulation material, the temperature is high due to the reaction heat during foaming, and the air in the bubbles is also relatively high temperature. 1 Insulation material α0
) As time passes from the end of filling, the air in the bubbles cools and contracts, thereby causing the heat insulating material (10) to contract. This shrinkage is always large inside the back plate (4), and the insulation material QOI and the back plate (4) are in close contact ~
- Because of 1, the back plate (4) is pulled toward the heat insulating material 00) side □ as the heat insulating material (lO) contracts, and a recess (12I) is created near the center of the back board (4).
1 Conventionally, as shown in Figure 3, the condensing pipe 〇4 included in the refrigeration cycle of the refrigerator was formed in a meandering shape and was installed behind the back plate □ (4), so the recess a2 was not noticeable and caused almost no problem in terms of appearance. It didn't happen. Also, in order to maintain the installation area PA+ of the refrigerator and improve the appearance of the rear surface, the condensation pipe (13) is fixed to the inner surface of the rear panel (4) with aluminum tape 04) as shown in □ in Figure 4. The old one is tall (4). Ega, Oka1. ．． . ,. 1□□Ka, 9
In recent years, due to improvements in the workability of assembling the condensing pipe UNI and the use of painted steel plates to form the outer box (2), the rear opening periphery of the cabinet (3), i.e., the top surface, as shown in Figure 5, has been (3a) and the left and right side surfaces (3b), (3c) are formed with a forward facing groove 09 that opens forward, and a condensation pipe (13) is installed in the forward facing groove 05).
A structure has been considered in which rearward grooves (16) opening rearward inward from 9 are arranged in parallel, and the rear plate (4) is engaged with and fixed to the rearward grooves (161).In this case, the condensation pipe A3 Since the back plate (4) is not reinforced in any way, a concave portion is formed, and there is no condensation pipe behind the back plate (4), resulting in the inconvenience that the appearance is significantly impaired.

(c) Purpose of the Invention To prevent the outer box from being dented due to shrinkage of the heat insulating material after foaming of the heat insulating box body constructed by foaming and filling a heat insulating material between the outer box and the inner box.

B) Outline of the Invention In an insulating box body, the insulating box is assembled into an inner box with a small distance between the outer box and the outer box, and a foaming insulating material stock solution is injected into the above-mentioned space, and the insulating material is foam-filled. A non-adhesive surface with the heat insulating material is formed on the inner surface of the outer box located at the final foaming area of the heat insulating material.

(E) Embodiments of the Invention FIGS. 6 to 88 show embodiments of the present invention, and the same reference numerals as in FIGS. 1 to 5 refer to the same elements. In the present invention, as shown in FIG.
) Attach a release material such as adhesive tape, paper, or a release agent to the center of the inner surface of the plate. 1゜□ After that, as in the above explanation, as shown in Fig. 7, the insulation material QQI'
If foam filling is performed, the final foaming part of the insulation material will be 0ω.

The inner surface of the back plate (4) and the heat insulating material (tlO) are peeled off as shown in Figure 8. . ,
Even if a recess αa is formed in the insulation material aQ itself due to 1 contraction, the back plate (
4) 1 is not dented.

(f) Application example of the invention In the example, a non-adhesive surface with the heat insulating material 0 (2) was formed on the back plate (4), but this is not limited to this, and modifications may be made without departing from the gist of the present invention. It is possible.

(g) Effects According to the present invention, in an insulating box body in which a foamable insulating material is foamed and filled within the space between an outer box and an inner box, the outer box at the final foaming part of the insulating material is in close contact with the insulating material. This will cause breakage due to shrinkage of air bubbles in the insulation material after foaming.

This prevents the outer box from being dented due to shrinkage of the heat material, resulting in a significantly better appearance.

[Brief explanation of the drawing]

Figures 1 to 5 show a conventional example, where Figure 1 is a rear perspective view of the insulation box, Figure 2 is an explanatory diagram when filling the insulation material,
Figure 3!・Figure 5 is a plan sectional view of the heat insulating box, Figures 6 to 8 show examples of the present invention, Figure 6 is a rear perspective view of the heat insulating box, and Figure 7 is a cross-sectional view of the heat insulating box. An explanatory diagram at the time of filling, Fig. 8 is a plan cross-sectional view of the insulating box, (2)...outer box, (6)...inner box, a■...
Insulating material, (10a)... Insulating material stock solution, (17)...
・Releasable material. 11th! lj Figure 2 Figure 3

Claims (1)

[Claims] 1. An insulating box body consisting of an outer box, an inner box, and the inner box is built into the outer box with a small distance between them, and then a foaming insulation material stock solution is injected into the space and the insulation material is foamed and filled. In the
A heat insulating box body characterized in that a non-adhesive surface with the heat insulating material is formed on the inner surface of the outer box corresponding to the final foaming part of the heat insulating material.