JPH0115788B2 - - 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 manufactured by an SF foaming method.

(b) Conventional technology SF (Stationary Fixture)
The foaming method has been frequently used in recent years to manufacture insulating boxes for large refrigerators and the like. In this method, the outer box is fixed with an outer jig with the opening of the box body consisting of both the inner and outer boxes facing upward, and then the inner box is fixed with an inner jig that descends from above to perform the foaming process. There is no need to invert the box before and after foaming in order to raise the inner jig after foaming and release the fixation of the outer jig.
The assembly work of both the inner and outer boxes, the foaming work, and the work of attaching parts to the box body after foaming can be performed all at once, with the opening of the box facing upward.This is particularly useful for manufacturing insulated boxes with a large internal volume. This has the advantage of being faster.

As shown in Japanese Utility Model Publication No. 46-18285, the process of assembling both the inner and outer boxes, which is the preliminary work for this foaming method, involves lowering the inner box from above the outer box, fitting it into the outer box, and inserting the inner box into the folded part of the outer box. This is done by hanging the inner box on the outer box by overlapping the flanges. However, in such assembly work, in order to fit the inner box into the outer box smoothly, a gap is formed between the inner box and the outer box, and this gap causes the inner box to be misaligned. The dimensions of the spaces formed between the inner and outer boxes did not match the predetermined set dimensions, and correction work was performed to move the inner box in the front, back, left, and right directions in order to adjust the space to the set dimensions. This has the disadvantage of requiring a long time to fit the inner jig into the inner box, and since the inner box flange and the folded part of the outer box are directly overlapped, it is difficult to insulate the refrigerator or hot storage after manufacturing. When a box body was used, there was also the drawback that heat conduction occurred from one side of the inner and outer boxes to the other, resulting in increased heat leakage.

(c) Object of the Invention The present invention aims to solve the drawbacks of the prior art and to improve the circulation of the blowing agent injected between the inner and outer boxes.

(D) Structure of the Invention In order to achieve the above object, the present invention includes a mounting portion extending outward from the opening edge of one opposing side wall, an upward flange extending upward from the mounting portion, and a mounting portion extending upward from the mounting portion. The inner box has an open top and has outward flanges extending outward on the opening edges of opposite side walls, and is attached to a downward flange on the opening edge of one opposite side wall for suspension support. , comprising insulating connecting members arranged below the lower end of the downward flange and forming receiving parts that face each other below the lower end of the downward flange and receive the mounting part, and the other opposing sides Prepare an outer box with an opening at the top with an injection port formed on either side of the wall, and two elongated insulating connecting materials each having a fitting part that projects downward and an exhaust port formed on either side. Then, the inner box is lowered into the outer box from above the outer box with the opening facing upward, and both placing parts are placed on the receiving parts of both connecting members, and both upward flanges are separated from both downward flanges of the outer box. The inner box is suspended and supported by both connecting members so as to be in contact with both connecting members to form a space between both the inner and outer boxes, and at the same time, the dimensions of both gaps and the bottom gap facing one side of this space are determined. The upper part of one of the remaining two opposing spaces that communicates with the outside through the inlet is provided so that it straddles the opening edges of both the inner and outer boxes and that the fitting part is fitted into this space. One connecting material has an exhaust port, and the other connecting material is placed above the gap between the two so that it spans the opening edges of both the inner and outer boxes, and the fitting part is fitted into this gap. The dimensions of both the gaps are determined by the fitting parts of both connecting materials, and both the inner and outer boxes are fixed with the inner and outer jigs with the openings facing upward. A method for manufacturing an insulating box body in which a foaming agent is injected through an injection port to grow, and as the foaming agent grows, the air in the space is discharged to the outside from an exhaust port to solidify the foaming agent and form a foam insulation material. provide.

(e) Examples Examples of the present invention will be described below based on the drawings.

Reference numeral 1 shown in FIGS. 1 to 4 is an inner box with an open top made of a suitable material such as resin or metal, and has front, rear, left and right side walls 1A, 1B, 1C, 1D and a bottom wall 1E integrally formed. Among the side walls, one opposing side wall 1A, 1B has mounting parts 1F, 1G facing outward, and upward flanges 1H, 1I facing upward from this mounting part, respectively. In addition, outward flanges 1J and 1K are formed at the opening edges of the other opposing side walls 1C and 1D, respectively. Reference numeral 2 denotes a metal outer box with an open top, in which front, rear, left and right side walls 2A, 2B, 2C, 2D and a bottom wall 2E are integrally formed. Among the side walls, one opposing side wall 2A, 2B is formed with folded parts 2F, 2G facing inward, and downward flanges 2H, 2I facing downward from the folded part, respectively. In addition, inward flanges 2J, 2K are formed at the opening edges of the other opposing side walls 2C, 2D, respectively, and injection ports 3, 3 for injecting the foaming agent are formed at two locations on the side wall 2C. is forming. 4 and 4' are insulating connecting members having the same length as the above-mentioned upward and downward flanges, and as shown in FIG. A first heat insulating board 6 made of hard material such as wood is attached to the fastening part, and a second heat insulating board 7 made of soft material such as foamed resin is attached to the receiving part. . 8 and 8' are connecting members made of a heat insulating resin such as vinyl chloride and have the same length as both the inward and outward flanges, and have fins 8A and 8B and a fitting that protrudes downward from between the fins. A joint portion 8C is integrally formed in the longitudinal direction. As shown in FIG. 4, an exhaust port 9 of an appropriate size is formed in the fitting portion 8C of one of the connecting members 8, and is covered with an air permeable member 10 such as moltoprene.

Next, the assembly of both the inner and outer boxes 1 and 2 will be explained.

First, the first heat insulating plates 6 of the connecting members 4, 4' are brought into contact with the downward flanges 2H, 2I of the outer box 2, respectively, and the connecting members 4, 4' are attached to the downward flanges 2H, 2I with screws 11, respectively. Fixed and suspended support. Next, as shown in FIG. 1, the inner box 1 is lifted above the outer box 2, and the inner box is lowered and fitted into the outer box 2.
Along with this fitting, both upward flanges 1H,
1I comes into pressure contact with both downward flanges 2H and 2I, but the inner box 1 pushes both upward flanges 1H and 1I slightly inward by their plate thickness due to its own weight, and further descends. The placing parts 1F and 1G are placed on the receiving part 5B via the second heat insulating plate 7 of both the connecting members 4 and 4', and both the upward flanges 1H and 1I are connected to the downward flanges 2H and 2I with a distance L between them. The inner box 1 is suspended and supported by both the connecting members 4, 4' while being spaced apart from each other and abutting the first heat insulating plates 6 of the connecting members 4, 4', respectively.
A space is formed between the inner box 1 and the outer box 2, and the distance M between the opposing side walls 1A, 2A, 1B, 2B,
M' and the bottom distance P between the bottom walls 1E and 2E are determined.
Through this process of fitting the inner box 1 into the outer box 2, the inner box 1 is suspended and supported by the outer box 2 via both connecting members 4, 4', and at this time, both connecting members 4, 4' It acts as a suspension member and a movement regulating member for the inner box 1, and a gap L is formed between the upward flanges 1H, 1I and the downward flanges 2H, 2I to prevent heat conduction between the inner and outer boxes 1, 2. ing. next,
The fitting part 8C of the connecting member 8 having the exhaust port 9 is fitted between the outward facing flange 1J and the inward facing flange 2J on one side, and the outward facing flange 1K and the inward facing flange 2K on the other side are fitted. By fitting the fitting part 8C of the connecting member 8' between them, the opposing side walls 1A, 2A, 1 of the inner box 1 and the outer box 2
The intervals N and N' between B and 2B are determined. This interval N,
When determining N′, if the spacing between the two is uneven,
It is sufficient to move the inner box 1 a little in either direction. At this time, both connecting members 8, 8' act as a lid member and a spacing member. After determining the respective intervals M, M', N, and N' of the spaces between both the inner and outer boxes 1 and 2 to preset dimensions, both upward flanges 1 of the inner box 1 are screwed with screws 12.
J, 1K are fixed to both connecting members 4, 4' respectively, and the fins 8A, 8 of both connecting members 8, 8' are secured with screws 13.
Both the inner and outer boxes 1, 2 are assembled by fixing B to the outward flanges 1J, 1K and the inward flanges 2J, 2K, respectively, to form a box body A' as shown in FIG.

The thus assembled box A' is placed on the substrate 15D of the outer jig 15 with the opening facing upward, and is then connected to this substrate via the hinge 17 etc., and the outer box A' stands approximately vertically. Each peripheral wall 15A to 15D of jig 15
The inner jig 16, which has descended from above, holds down each of the side walls 2A to 2D of the outer box 2, and each of the side walls 1A to 1D of the inner box 1, the folded parts 2F and 2G of the outer box 2, and both connecting members 8, 8' and fixed to the SF foaming device as shown in FIGS. 5 and 6.

Then, a liquid foaming agent 18 such as hard polyurethane whose foaming density has been increased by a convectional method is injected at two points on the side wall 2D side at the distance P through the injection ports 3, 3 using an injection gun. This injected foaming agent 1
8 is filled into each interval M, M', N, N', P through the growth process of cream, gel, and foam state, while air and gas in the space are as shown in Fig. 6 as the foaming agent 18 grows. As shown, the bubbles are gradually pushed out from the exhaust port 9 as shown by the arrow, and the final foaming point is the exhaust port 9.
The air and gas in the vicinity are pushed out, and the blowing agent 1 is pushed up as shown in FIG.
8 is solidified to become a foamed heat insulating material 18', and a heat insulating box A shown in FIG. 7 can be obtained. Incidentally, in FIG. 7, reference numerals 19, 19 are sealing members such as tapes that close the injection ports 3, 3. When this insulated box is used as a refrigerator or low-temperature case,
The opening may be used as the top or front surface, and in such a case, a heat-insulating rail or door is installed to cover both upward flanges 1H, 1I and both downward flanges 2H, 2I, as shown by the chain lines in Figure 3. The receivers 20 are arranged to face each other.

According to this manufacturing method, as the inner box 1 is lowered from above the outer box 2 into the outer box, both the mounting parts 1F and 1G are placed in the receiving parts 5B of the two connecting members 4 and 4'. Since the upward flanges 1H and 1I are placed in contact with the inner surfaces of the connecting members 4 and 4', the inner box 1 is suspended and supported at the same time as the two opposing spaces M, The dimensions of M' and the interval P automatically become the set dimensions, and the dimensions of the other opposing distances N and N' in the space, which accompany the arrangement of both connecting members 8 and 8', automatically become the set dimensions. , not only does the assembly work of the box body A' become easier, but also the exhaust port 9, which will be the final foaming point, is connected to the inlet ports 3 and 3 at the same time as the connection materials 8 and 8' are placed.
Since the foaming agent 18 is obtained above, the foaming work can be started immediately after the assembly of the box A' is completed, and the foaming agent 18 can be injected near the side wall 2D at a distance P that is approximately diagonal to the exhaust port 9. Accordingly, the blowing agent 18 is applied at each interval.
N', P, M, M' are filled, and then they merge from three directions to fill the interval N. In order to follow the growth process, the rotation is good, and especially the interval P where the filling volume of the foaming agent 18 is large. It is possible to prevent foaming failure in this interval by filling the foaming agent early, and since the injection ports 3 and 3 and the exhaust port 9 both face the interval N where the growth rate of the foaming agent 18 is slow, the flow from both the openings is There is almost no leakage of the foaming agent 18, and the foaming operation becomes extremely good. Furthermore, since both the inner and outer boxes 1 and 2 are connected at a distance from each other by the insulating connecting members 4, 4' and the connecting members 8, 8', the refrigerator,
When used as a hot storage, heat conduction from the inner box 1 to the outer box 2 can be prevented, resulting in an insulated box A with little heat leakage.

(F) Effects In the present invention described above, in addition to the connecting member acting as a hanging member and movement regulating member for the inner box, the connecting member acts as a spacing member between both the inner and outer boxes.
At the same time that the inner box is fitted into the outer box and suspended and supported by both connecting members, the dimension of the gap between the two facing each other on one side automatically becomes the set dimension, and as the two connecting members are arranged, the distance between the oppositely facing sides of the other side is automatically set. Since the interval dimensions automatically become the set dimensions, there is no need to correct each interval when assembling both the inner and outer boxes, allowing for quick assembly. Because the exhaust port can be obtained, the foaming work can be started immediately after the assembly work is completed, and during the foaming work, the flow of the foaming agent is improved in the gap at the bottom, which has the largest volume, and the inlet and exhaust port are It is possible to almost eliminate foam leakage from the mouth, allowing for extremely good foaming work.Moreover, since both the inner and outer boxes are assembled with a distance from each other using both connecting materials and both connecting materials, which are both heat-insulating, When the box is used as a refrigerator or a hot storage, heat conduction between the two boxes can be prevented, and an insulated box with little heat leakage can be provided.

[Brief explanation of drawings]

The drawings show an embodiment of the method for manufacturing a heat insulating box according to the present invention, in which Fig. 1 is an exploded perspective view of both the inner and outer boxes, Fig. 2 is an assembled perspective view of both the inner and outer boxes, and Fig. 3 is Fig. 2 A-A. 4 is a sectional view taken along the line B-B' in FIG. 2, FIGS. 5 and 6 are longitudinal sectional views showing the foaming process, and FIG. Figure 8 is Figure 7C
-C' sectional view. 1...Inner box, 1F, 1G...Placement section, 1H, 1
I...Upward flange, 2...Outer box, 3,3...
Inlet, 4, 4'... Connecting material, 5B... Receiving part, 8,
8'... Connection material, 9... Exhaust port, 15... Outer jig,
16... Inner jig, 18... Foaming agent, M, M', N,
N', P...interval.

Claims (1)

[Claims] 1 A mounting portion extending outward from the opening edge of one opposing side wall, an upward flange extending upward from the placement portion, and an outwardly extending flange extending outward from the opening edge of the other opposing side wall. The inner box has an open top and has flanges, and is attached to and suspended from downward flanges at the opening edges of one of the opposite side walls, and is arranged so as to face each other downward from the lower end of the downward flanges. an outer box with an opening on the top and an inlet formed on one of the opposing side walls, and a fitting part that protrudes downward. Then, prepare two elongated insulating connecting materials with an exhaust port formed on either side, lower the inner box into the outer box from above the outer box with the opening on the top, and connect both mounting parts to both sides. At the same time as placing it on the receiving part of the connecting member, both upward flanges are spaced from both downward flanges of the outer box and in contact with both connecting members, and the inner box is suspended and supported by both connecting members to create a space between the inner and outer boxes. At the same time as forming the space, determine the dimensions of the opposing spaces and the bottom space of one of the spaces, and the upper part of the remaining space that communicates with the outside through the inlet. one connecting member that spans the opening edges of both the inner and outer boxes and has an exhaust port so that the fitting part fits into this gap; In addition, the other connecting material is arranged so that the fitting part is fitted into this gap, the dimensions of both the gaps are determined by the fitting part of both the connecting materials, and both the inner and outer boxes are opened with the opening facing upward. A foaming agent is injected from the injection port into the space near the side wall opposite to the side wall where the injection port was formed by rotating both the inside and outside jigs to cause growth, and as the growth occurs, the air in the space is removed from the exhaust port. A method for producing a heat insulating box body by solidifying a foaming agent by discharging it to the outside to form a foamed heat insulating material.