JPS6015236B2 - Manufacturing method of insulation box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a heat insulating box for a refrigerator, refrigerated showcase, etc.

In general, a heat insulating box body has a gas vent hole formed in the outer box near the final filled part of the foam insulation material to remove air, gas, etc. from the gap between the inner and outer boxes, and the hole is closed after the gas is removed. Met.

Closing the gas vent hole with a plug after gas venting, which is used only once during manufacturing, not only requires a considerable amount of labor when manufacturing large quantities of insulation boxes in factories, but also requires a small amount of insulation material to be removed from the gas vent hole. If the heat insulating material leaks and adheres to the outer box, the product value will be lost, so a so-called post-processing operation is required to remove the adhered heat insulating material. The present invention was made in view of these points,
Examples thereof will be described below with reference to the drawings.

Reference numeral 1 denotes a heat insulating box such as a refrigerated showcase, and the main body is made up of an inner box 2 made of resin, an outer box 3 made of metal, and a foamed heat insulating material 4 such as hard polyurethane foam filled in the gap between the inner and outer boxes. The interior 5 defined by the inner box includes a cooler 6, a blower 7, and a shelf 8, a transparent plate 9 on the front of the main unit that allows the inside of the refrigerator to be seen through, and a back side of the main unit for storing and taking out products. Opening □1
0 and 10, and a rotatable heat insulating door 11 (only one is shown) which opens and closes the gate.

Reference numerals 12 and 12 designate parts such as a pair of upper and lower hinges that pivotally support the door. The screws 15 are fixed to the reinforcing plate 14 for parts mounting.

Note that 16 is a mounting hole formed in the parts 12, 12.
The reinforcing plate has through holes 13, 13 and a gas vent hole 17 that fits
, 17, and a screw hole 18 into which the screw is screwed, and is attached to the back surface of the outer case 3 by means of fixing or the like. Reference numeral 19 denotes a breathable member such as motartprene attached to cover the reinforcing plate.

Next, a method for manufacturing the heat insulating box 1 will be explained.

A reinforcing plate 14 is attached by welding to the back side of the outer box 3 so that the through holes 13, 13 and gas vent holes 17, 17 are connected, and a breathable member 19 is attached so as to be located on the foam insulation material side. to cover the gas vent holes 17, 17 and the screw hole 18. After that, the inner box 2 is placed inside the outer box 3 to form a gap that will become a foaming space, and the foam is used to absorb odors from both the inside and outside (not shown).
After fixing both the inner and outer boxes 2 and 3 with
A raw solution of rigid polyurethane foam is injected into the gap and foamed, and the foaming pressure causes the air in the gap and gases such as gas generated from the foam to be discharged to the outside through the gas vent holes 17, 17 and the through holes 13, 13. When the gas discharge is completed and the foamed foam reaches the final filling part, the foamed foam is impregnated into the breathable member 19 and the gas vent hole 17,
17 and the screw hole 18, solidified, and the foamed insulation material 4
form. After forming the foam heat insulating material 4, both the inner and outer foam picks are taken out and the articles 12, 12 are attached to the reinforcing plate 14 via the outer box 3 so as to close the through holes 13, 13. According to the above method, the gas vent holes 17, 17 and the through holes 13, 1 that fit the lotus
3 is closed at the same time as parts 12 and 12 are attached.
The manufacturing process can be simplified, the number of parts can be reduced, and even if a small amount of heat insulating material leaks around the through holes 13 and adheres to the outer box 3, the adhering heat insulating material can be removed from the parts 12 and 1.
2, so no post-processing is required.

Furthermore, as shown in FIG. 5, by forming a convex portion 20 protruding outward on the outer box 3 near the final filling section, gas can be discharged well and the strength of the outer box 3 and the vicinity of the final filling section can be improved. You can improve. As described above, the present invention provides a method for manufacturing a heat insulating box in which a foamed heat insulating material is formed by injecting and foaming a stock solution of hard polyurethane foam into the gap between the inner and outer boxes. A through hole is formed in the outer box in advance, and a reinforcing plate for attaching components having a gas vent hole that fits into the through hole is attached to the back side of the outer box by pasting a breathable member, and the gas vent hole is removed during foaming. After exhausting the gas in the gap to the outside through the through hole, the parts are attached to the reinforcing plate through the outer box so as to close the through hole. The manufacturing process can be simplified by blocking the hole, and post-treatment of the heat insulating material leaking from the through hole can be eliminated.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a heat insulating box showing an embodiment of the present invention;
The figures are a cross-sectional view taken along line A-A' in FIG. 1, FIG. 3 is an enlarged sectional view of the main part, FIG. 4 is a perspective view of parts, and FIG. 5 is an enlarged sectional view of the main part showing an embodiment of the present invention. . 12...Parts, 13...Through hole, 14...
・Reinforcement plate, 17...Gas vent hole. Traditional 1 illustration Leopard 5 illustration collection is Traditional 3 illustrations Traditional 4 illustrations

Claims (1)

[Scope of Claims] 1. In a method for manufacturing a heat insulating box in which a foamed heat insulating material is formed by injecting and foaming an undiluted solution of hard polyurethane foam into the gap between the inner and outer boxes, the final filling part of the foamed heat insulating material is A through hole is formed in advance in the nearby outer box, and a reinforcing plate for parts mounting, which has a gas vent hole communicating with the through hole, is attached to the back side of the outer box by pasting a breathable material. After exhausting the gas in the gap to the outside through the gas vent hole and the through hole,
A method for manufacturing a heat insulating box, characterized in that parts are attached to a reinforcing plate via an outer box so as to close a through hole. 2. The method of manufacturing a heat insulating box according to claim 1, characterized in that a convex portion projecting outward is formed on the outer box near the final filling part.