JPH04262192A - Heat insulation box structure - Google Patents

Abstract

PURPOSE:To provide heat insulation box structure which is prevented, by curve of a charging port covering, from being distorted when having been charged thereinto with a foamed heat insulator material. CONSTITUTION:A foamed heat insulation material 40 is charged, via a charging port 21, into a space portion S between an outer box 11 and an inner box 31. The charging port 21 is formed, in the vicinity thereof, with a drawn portion 21A including a recess edge 21B and a recessed portion 21c, by drawing a rear plate 15 of the outer box 11 to provide a level difference or raised portion D. The raised portion D is expanded by a foaming pressure and is set to a value greater than an amount of variation L in a charging port covering 22 projecting outwardly from the charging port 21. Accordingly, the charging port covering 22 is prevented from projecting to the outside more than the level of the rear plate 15. Since the covering 22 adhered to a rear face of the recessed portion 21c is not affected by the foaming pressure, the covering 22 does not fall off from the rear plate 15.

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 body in which a space formed by an outer box and an inner box is filled with a foamed heat insulating material.

0002

[Prior Art] As an example of a conventional insulation box of this type,
A heat insulating box for use in refrigerators and the like will be explained with reference to the drawings. Fig. 4 is a perspective view of the back side of the insulation box, Fig. 5 is a sectional view showing how to attach the injection port cover, Fig. 6 is a sectional view illustrating the injection state of the foam insulation material, and Fig. 7 is after filling the injection port with foam. FIG.

[0003] The heat insulating box has a double structure consisting of an outer box 11 and an inner box 31, and a space S between the two is filled with foam heat insulating material 4.
It has a basic structure filled with 0s. The outer box 11 is made up of left and right side plates 12, a top plate 13, a bottom plate 14, and a back plate 15, and is open on the front side. The inner box 31 has an open front surface and is attached to the inside of the outer box 11 with the open side facing the same direction.

A plurality of injection ports 16 (two in the illustrated example) are provided on the surface of the back plate 15 for injecting a foamed heat insulating material 40 such as a rigid urethane foam foaming liquid into the space S. There is. Further, an inlet lid 17 for closing the inlet 16 is attached to the back surface of the back plate 15 so as to be openable and closable. The injection port 16 is formed by punching out a circular shape from the back plate 15, and the injection port lid 17 is an elastic thin metal plate, and an adhesive portion 17A is formed at the end of one side using adhesive or double-sided tape. . The injection port cover 17 is shown in Figure 5.
As shown in the figure, the adhesive part 17A covers the injection port 16 and is fixed to the back plate 15.

When the injection nozzle 41 is inserted into the injection port 16, the injection port cover 17 is pushed and bent inward into the space S, and the foamed heat insulating material 40 is injected. Inject nozzle 41 into inlet 1
When taken out from the inlet 6, the inlet cover 17 is restored by its elasticity and tightly adheres to the inner surface of the inlet 16 without any gaps. The injected foamed heat insulating material 40 spreads to every corner and is filled with foam, but is prevented from leaking to the outside from the injection port cover 17.

[0006]

However, in the conventional injection port 16 and injection port lid 17, the foam insulation material 40
As shown in FIG. 7, the foaming pressure generated during foaming causes the injection port lid 17 to curve and bulge outward, causing distortion. Therefore, the appearance is unsightly and unsightly. The present invention was devised in view of the above circumstances, and an object of the present invention is to provide a heat insulating box that does not look bad even if the injection port cover swells due to foaming pressure.

[0007]

[Means for Solving the Problems] A heat insulating box body according to the present invention includes an outer box having a plurality of injection ports and an injection port cover for closing the injection ports, an inner box attached to the inside of the outer box, and an outer box. The space between the inner box and the inner box is provided with a foamed heat insulating material filled through the injection port, and the injection port has a drawn part formed by drawing the back plate of the outer box around the injection port. It is characterized by being Further, the drawing part is formed by a recessed edge formed by providing a step around the opening periphery, and a step separated from the recessed edge on one side of the recessed edge, and the end of the injection port cover is adhered to the back surface of the recessed edge. It also includes a recessed groove, and the step is formed to be larger than the amount of deformation of the injection port cover expanded by the foaming pressure of the foamed heat insulating material. Therefore,
Even if the inlet cover swells due to foaming pressure, it does not protrude outward from the back plate.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of the injection port, FIG. 2 is a side sectional view illustrating how to attach the injection port cover, and FIG. 3 is a plan view sectional view showing the main parts after filling with foamed heat insulating material. The same parts as in the prior art are indicated by the same reference numerals. The heat insulating box body includes an outer box 11, an inner box 31, and a foamed heat insulating material 40 filled in a space S between the two, and a back plate 15 forming the outer box 11.
is provided with a circular injection port 21 and an injection port lid 22 for closing the injection port 21. As shown in FIGS. 1 and 2, the injection port 21 has a drawn portion 21A formed at the periphery of the opening of the injection port 21 by drawing.

The drawn portion 21A is formed by supporting the back surface of the back plate 15 with a die (not shown) and pushing a punch (not shown) into the surface, and has a concave edge 21B and a concave groove 21C. The concave edge 21B is formed concentrically with a step D at the periphery of the injection port 21. Further, the groove 21C is formed in a straight line with a step D 2 spaced apart from the groove 21B by a predetermined distance on one side of the groove 21B. Said step D
is the difference in height between the outer surface and the inner surface of the back plate 15 in the drawing section 21A, and is set to be larger than the amount of deformation L, by which the inlet cover 22 expands and projects forward due to the foaming pressure.

The injection port cover 22 is an elastic thin metal plate, and an adhesive portion 2 is attached to the edge of the upper surface with adhesive or double-sided tape.
2A is formed. Then, the injection port cover 22 is fixed to the back plate 15 by pasting the adhesive part 22A on the back surface of the groove 21C. As described above, the inlet cover 22 has a larger area than the conventional inlet cover 17 because it is attached to the back surface of the groove 21C.

Next, the function of the heat insulating box of the present invention will be explained. The foamed heat insulating material 40 injected into the space S through the injection port 21 foams and fills the space. Then, the injection port cover 22 swells due to the foaming pressure, and curves and protrudes outward from the injection port 21. However, since the step D of the concave edge 21B is set to be larger than the amount of deformation L of the inlet cover 22, the inlet cover 22 does not protrude further outward than the back plate 15. Further, the groove 21C, which is the margin for attaching the injection port cover 22, is formed to be larger than the conventional product and separated from the concave edge 21B by a predetermined distance. Therefore, the adhesive part 22A is attached to the inlet lid 2.
2, the injection port cover 22 does not fall off from the back plate 15. Although this embodiment has been described with respect to a refrigerator, it can also be applied to other types of heat insulating boxes.

0012

Effects of the Invention As explained above, in the heat insulating box according to the present invention, a drawing part is formed on the back plate of the outer box around the inlet, and the inlet cover deformed by the foaming pressure is pushed away from the back plate. Since it does not protrude outward, it has a good appearance. Further, there is an effect that the injection port cover does not fall off from the back plate.

[Brief explanation of the drawing]

FIG. 1 is a drawing according to the present invention, which is a plan view of an injection port.

FIG. 2 is a drawing according to the present invention, and is a side sectional view illustrating how to attach the inlet cover.

FIG. 3 is a drawing according to the present invention, which is a sectional view of a main part in a plan view showing a state after filling the foamed heat insulating material.

FIG. 4 is a drawing related to the prior art, which is a rear external perspective view of a heat insulating box.

FIG. 5 is a drawing related to the prior art, and is a sectional view illustrating how to attach an injection port cover.

FIG. 6 is a drawing related to the prior art, and is a sectional view illustrating a state of injection of foamed heat insulating material.

FIG. 7 is a drawing related to the prior art, and is a sectional view illustrating the state of the injection port after foam filling.

[Explanation of symbols]

11 Outer box 15　Back plate 21 Inlet 21A Drawing processing section 21B Concave edge 21C Concave groove 22 Inlet cover 22A Adhesive part 31 Inner box 40 Foam insulation material S Space part

Claims (2)

[Claims] [Claim 1] An outer box having a plurality of injection ports and an injection port lid for closing the injection ports, and an inner box attached to the inside of the outer box.
The space between the outer box and the inner box is provided with a foamed heat insulating material filled through the injection port, and the injection port has a drawing part formed by drawing the back plate of the outer box around the injection port. An insulating box body characterized by being formed with. 2. The drawing part is formed by a concave edge formed by providing a step around the opening periphery, and a step provided on one side of the concave edge away from the concave edge, and the end of the inlet cover is formed on the back side of the concave edge. 2. The heat insulating box according to claim 1, further comprising a groove for adhering to the insulating box, and wherein the step is formed to be larger than the amount of deformation of the inlet cover expanded by the foaming pressure of the foamed heat insulating material.