JPH0337119B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for manufacturing a heat insulating box such as a refrigerator or a low-temperature case, which has an opening and a projecting wall formed on one side.

(b) Prior art Publication of Utility Model Publication No. 54-48600, Publication of Utility Model Publication No. 55-31509, etc. discloses that both the inner and outer boxes 41 and 42 are used as shown in Fig. 8.
A heat insulating box body 40 is constructed in which a foamed heat insulating material 46 is filled in the space of the box, which has an opening 44 closed on one side by a transparent door 43 and a projecting wall 45 extending toward the opening. It is shown. A top plate 47 forming a door storage section is provided on the top of the projecting wall 45.

Since such a heat insulating box 40 forms a protruding wall 45, the opening 44 is narrow and therefore, during the foaming process, it is placed in the refrigerator interior 48 to hold down the inner box 41 as shown in FIG. A nest 50 is used as a part of the inner jig 49. In addition, when a part of the inner box 41 serving as the inner wall of the projecting wall 45 is used as the cooler 51, the foam density of the foamed heat insulating material 46 filled in the projecting wall 45 is maintained high to improve the heat insulation effect. There is a need,
For this purpose, during the foaming process when the top plate 47 is not attached, the box 4 is
A commonly used method is to form a foamed heat insulating material 46 in the space 52 between the inner and outer boxes 41 and 42 with the 0A installed. In this method nest 50
is inserted from the opening 44 into the inner box 41 of the box 40A, which is installed with the opening 44 and the projecting wall 45 as the upper surface, as shown in FIG. Bottom wall 41 which is the lower surface of
As shown in FIG. 10, the box 40A is inverted and installed with the opening 44 and the projecting wall 45 as the bottom surface, and the inner jig 49 is stored in the inside 48. When the outer box 42 is held down by the outer jig 53, its weight is applied to the inner wall of the projecting wall 45, and the bottom wall 41A, which is the upper surface of the inner box 41,
, and create a gap H between the bottom wall 41A and the bottom wall 41A.
form. This gap H is created because the height of the nest 50 is made smaller than the distance between the inner wall of the protruding wall 45 and the low wall 41A that faces the inner wall of the protruding wall, thereby making it easier to arrange the nest 50. However, the upper surface of the inner jig 49 is in contact with the bottom wall 41A, and the foam insulation material 4 is placed in the space 52 of the box 40A with the gap H formed between the upper surface of the nest 50 and the bottom wall 41A.
When 46A of stock solution No. 6 is injected and foamed, No. 10
The foaming pressure causes a portion of the bottom wall 41A to bulge toward the nesting side, as shown by the chain line in the figure, and the foamed heat insulating material 46 solidifies with this bulge 54 formed, resulting in a predetermined shape as shown in FIG. However, the inner box 41 could not be obtained, and there was a drawback that it was difficult to place the articles.

(c) Purpose of the invention The present invention aims to solve the drawbacks of the prior art.

(d) Structure of the invention Before assembling the box body, which connects both the inner and outer boxes to form a space between the two boxes, and has an opening on one side and a projecting wall extending toward the opening. , a gap between the two walls of the inner and outer boxes that face the opening and the projecting wall and that face each other in the space, and one of the two faces that face the two walls; After placing the heat insulating blocks forming the box in advance and installing the box so that the opening and projecting wall are on the top,
Insert the nest into the inner box and place it directly under the projecting wall,
After eliminating the gap by bending the wall that forms the lower surface of the inner box due to the weight of the nest, the opening and projecting wall of the box body with the nest placed therein are made the lower surface, and this projecting wall is A method for producing a heat insulating box body, which receives the weight of the nest at the inner box and restores the gap by eliminating the deflection of the wall of the inner box, and then forming a foam heat insulating material in the space.

(E) Embodiments of the Invention Figures 1 to 3 show embodiments of the present invention. In the figures, 1 is an insulating box such as a low-temperature show case used for selling ice cream, etc. The main body is composed of a heat insulating box 4 equipped with a window 2 and two left and right transparent doors 3A, 3B on the front half of the top surface, which can be slid in the front and rear directions, a machine room 5 below the main body, and a machine room 5 above the second half of the top surface. A storage chamber 6 is formed.

The heat insulating box includes an inner box 8 made of metal with an open top that defines the interior 7 of the refrigerator, and an outer box made of metal with an open top that stores this inner box and forms a space between the inner box and the inner box. 9 and a foamed heat insulating material 10 such as hard polyurethane which is foamed and filled into the space between the inner and outer boxes, and has an opening 11 on one side for loading and unloading products.
and a projecting wall 12 extending in the opening direction. The inner box is composed of front, back, left, right, and bottom walls 8A to 8E, and has a main cooler row 13 consisting of meandering low-temperature refrigerant pipes provided on its outer circumferential surface, and a main cooler row 13 arranged in the rear half of the upper surface. , a plate-shaped auxiliary cooler 1 formed by a so-called roll bonding method and serving as an inner wall of the projecting wall;
4 to cool the inside 7 of the refrigerator. Moreover, the outer box is
Front wall 9A, back wall 9B, left and right walls 9C, 9D
and a bottom wall 9E that slopes gently upward at the rear and has an injection hole 16 for the foam insulation material at the rear edge and an appropriate number of exhaust holes 17 at the front edge, and a bottom wall 9E located directly above the auxiliary cooler. and an upper wall 18 that slopes gently downward toward the rear and serves as an outer wall of the projecting wall. Moreover, the foam insulation material 10
A suitable number of cylindrical heat insulating blocks 19 made of a heat insulating molded material such as styrene foam and partition members 20 also made of a heat insulating molded material such as styrofoam are buried inside. The insulation block is interposed between the bottom walls 8E and 9E of both the inner and outer boxes 8 and 9, and the partition member 20 is interposed between the auxiliary cooler 14 and the upper wall 18 in the longitudinal direction thereof. . Note that both the inner and outer boxes are connected to each other by breakers 21 and 22 made of resin.

The machine room 5 includes a lower part of the front wall 9A of the outer box, lower parts of both left and right walls 9C and 9D, a bottom wall 9E, an exhaust passage 23A opening vertically at the upper edge, and a lower part of the exhaust passage. Exhaust passage 23B that opens in the front-rear direction
A removable cover 2 that forms a
4 and a base 26 located at the rear of the lower surface and forming an intake passage 25 between the lower end of the front wall 9A of the outer box, and constituting a refrigeration cycle with both the main and auxiliary coolers. Based on machine 27 2
6. A pair of supports 29A in which wire finch tube condensers 28 are provided on both front and rear edges of the intake passage;
They are attached to 29B respectively.

Next, manufacturing of the heat insulating box will be explained with reference to FIGS. 4 to 6.

First, attach the insulation block 19 to the bottom wall 8 with adhesive.
E. The inner box 8 attached to the outer surface and the outer box 9 are connected by breakers 21 and 22, and a heat insulating block 19 and a partition material 20 are interposed in the space 30, and the heat insulating block and the bottom of the outer box 9 are connected. Gap 3 between wall 9E
1, and an opening 11 and a projecting wall 12 on one side.
Assemble the box 4' as shown in FIG. next,
After installing the box 4' with the opening 11 and the projecting wall 12 as the upper surface, insert the nest 32 into the inner box 8 from the opening 11, place it on the front half of the bottom wall 8E, and then slide this nest backward. Then, it is placed directly under the projecting wall 12 as shown in FIG. With this arrangement of the nests, the bottom wall 8E of the inner box 8 receives the weight of the nest 32 and swells and bends toward the space 30. On the other hand, due to this bending, the insulation block 19 hits the bottom wall 9E of the outer box 9, creating a gap. 31 will be canceled. After placing the nest, turn over the box 4' while placing the nest in the inner box 8, and use both the inner and outer jigs 33, 3 so that the opening 11 and the protruding wall 12 are on the lower surface.
4 to hold the box 4' in place as shown in FIG. The weight of the nest 32 due to the above-mentioned inversion is applied to the auxiliary cooler 14, which is the inner wall of the projecting wall 12, and as a result, the bending of the bottom wall 8E of the inner box 8 is eliminated, and the heat insulating block 19 is The gap 31 is formed again after separating from the bottom wall 9E of the outer box. In such a state, by injecting the foaming stock solution 10' into the space 30 from the injection hole 16, the stock solution 1 is poured as shown by the arrow in FIG.
As the foam 0' grows, the air in the space 30 is pushed out through the exhaust hole 17 to form the foamed heat insulating material 10, and the above-mentioned heat insulating box 4 is obtained.

According to such a manufacturing method, the opening 11 and the projecting wall 1
When the box 4' is installed with 2 as the top surface and the nest 32 is placed directly below the projecting wall 12, the bottom wall 8E of the inner box 8 is bent toward the space 30 due to the load of the nest 32, and the insulation block 19 is bent both inside and outside. Bottom wall 8 of boxes 8 and 9
Since it is sandwiched between both E and 9E and acts as a spacer and can temporarily eliminate the gap 31, the deflection that occurs in the bottom wall 8E due to the load of the nest 32 can be reduced.
When there is no load, this bottom wall 8E is fixed within a self-returnable range that allows it to return to its original state, thereby preventing unnecessary deformation of the bottom wall 8E. A gap is formed between the insert 32 and the cooler 14, so that the insert 32 can be moved smoothly within the inner box 8. Furthermore, when the box 4' is turned upside down with the nest 32 placed inside the inner box 8, the load of the nest 32 is received by the auxiliary cooler 14, and the bottom wall 8E self-returns to eliminate the deflection and the bottom wall 8E Since the gap 31 is re-formed as it comes into contact with or very close to the upper surface of the insert 32, it is possible to prevent the bottom wall 8E from expanding toward the insert 32 due to the foaming pressure of the foamed heat insulating material 10, and the gap 31 This improves the flow of the foamed heat insulating material 10.

That is, by forming the gap 31 with the heat insulating block 19, the heat insulating box 4 having the inner box 8 of a predetermined shape can be obtained after the foaming process.

FIG. 7 shows another embodiment of the present invention, in which, unlike the case of FIG. 4, a heat insulating block 19 is adhered to the surface of the bottom wall 9E of the outer box 9 on the side of the space 30 with an adhesive. Therefore, when the box 4' is turned over as shown in FIG. 6, a gap corresponding to the gap 31 is created between the heat insulating block 19 and the bottom wall 8E of the inner box 8 while the heat insulating block 19 is held on the bottom wall 9E. , the same effect as above occurs.

(f) Effects of the invention As described above, according to the manufacturing method of the present invention, the effects listed below are produced.

During the process of assembling the nest into the inner box, the deflection due to the load of the nest on the wall of the inner box facing the projecting wall is
Unnecessary deformation of the inner box can be prevented by restricting the inner box with a heat insulating block serving as a spacer, and since the gap caused by the bending is eliminated, the nest can be moved smoothly within the inner box.

During the foaming process, in which the box is inverted and foamed while the nest is placed in the inner box, the load of the nest is transferred from the wall of the inner box to the inner wall of the protruding wall, eliminating deflection on the wall of the inner box and filling the gap. Since it can be re-formed, it is possible to prevent the wall from deforming due to foaming pressure, and the flow of the foamed heat insulating material is improved, thereby avoiding foaming defects.

[Brief explanation of the drawing]

Each of the drawings shows an embodiment of the method for manufacturing a heat insulating box according to the present invention, and FIG. 1 is a cross-sectional view taken along line A-A' in FIG.
The figure is a front perspective view of the insulation box, and Figure 3 is Figure 2B-
B' sectional view, Figure 4 is a vertical sectional view of the box, Figure 5 is a vertical sectional view of the box with nests arranged, Figure 6 is a vertical sectional view showing the foaming process, and Figure 7 corresponds to Figure 4. FIGS. 8 to 10 are longitudinal cross-sectional views of a box showing other embodiments of the invention, FIG. 8 is a vertical cross-sectional view of the entire box after foaming, and FIG. The top view and FIG. 10 are overall vertical cross-sectional views during foaming. 4'...Box, 8...Inner box, 8E...Bottom wall, 9...
...Outer box, 9E...Bottom wall, 10...Foam insulation material, 1
1...Opening, 12...Protruding wall, 19...Insulating block, 30...Space, 31...Gap, 32...Nesting.

Claims (1)

[Claims] 1. Before assembling a box that connects both the inner and outer boxes to form a space between the two boxes, and also has an opening on one side and a protruding wall extending toward the opening, the opening and the protruding wall are A heat insulating block is provided between the two walls of the inner and outer boxes facing each other and facing each other in the space, and forming a gap between one of the two opposing sides of the two walls. After setting the box so that the opening and the protruding wall face up, the nest is inserted into the inner box and placed directly under the protruding wall. After bending the wall that forms the bottom surface of the box to eliminate the gap, the box is turned over with the nest placed in place so that the opening and the projecting wall are the bottom surface, and this projecting wall receives the weight of the nest. . A method for manufacturing a heat insulating box body, which comprises removing the deflection of the wall of the inner box to restore the gap, and then forming a foam heat insulating material in the space.