JPS5934869Y2 - Insulated boxes for refrigerators, etc. - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a heat insulating box for a refrigerator or the like using a foamed heat insulating material such as polyurethane.

Generally, in a refrigerator body using a foam insulation material such as polyurethane, an inner box is fitted into an outer box, and a seal is placed between the inside and outside of the box, and a jig is used to ensure that the back wall of the box is facing up. The outer box and the inner box are fixed to each other, and a foaming solution such as polyurethane is injected into the filling gap between the outer box and the inner box through an injection port provided on the back wall.

However, if the heat insulating wall of the refrigerator box has a complicated shape and is not vertically asymmetrical, and the injection port opening on the back wall of the box is biased to either the top or bottom, the polyurethane stock solution immediately after injection will Because it is a liquid and has fluidity, if urethane is not foamed and filled into the filling gap farthest from the injection port, or if it is incompletely filled, sufficient insulation effect will not be obtained, and the performance of the refrigerator will be affected. The disadvantage was that it greatly affected the

This invention aims to eliminate this drawback.When injecting polyurethane stock solution into the filling gap between the inner box and the outer box that form the refrigerator box, a large amount is poured into the filling gap far from the injection port. Obstacles are installed so that the undiluted solution flows easily, the flow rate is adjusted, and the filling amount of the heat insulating material is made uniform.

The invention will be explained in detail below with reference to the illustrated embodiment. Figure 1 shows a box made by the two-hole injection method on the back side, which is one of the methods for injecting and foaming polyurethane stock solution into an insulating box such as a refrigerator. , 1 is a box body consisting of an outer box 2 and an inner box 3, and an opening flange portion (not shown) of the inner box is engaged with an opening edge of the outer box 2.

Reference numeral 4 denotes injection ports for the foaming stock solution provided on both sides of the rear wall 5 of the box body, which open toward the filling gap of the side wall 6 of the box.

When this injection port is opened downward from the center of the box body and the foaming stock solution is injected through the injection port to cause foaming, an unfilled area often occurs in a portion A in the figure which is far away from the injection port.

This is because a large amount of the injected foaming stock solution exists in the lower part and foams, making it difficult for the foaming solution to reach the upper part.

7 is a flow path blocking member made of a styrofoam block or the like.

As a result of experiments by this inventor, a block of side wall 6 width 35 m x height 50 m x thickness 25 mm was glued and fixed in the gap of side wall 6 about 15 an apart from directly below the injection port 4 toward the bottom.
When the undiluted solution was injected from above the injection port 4, a large amount of the foaming undiluted solution flowed and filled up to part A shown in Fig. 1, yielding good results.
This is because, as shown in FIG. 2, the foaming stock solution injected from the injection port 4 once contacts the lower surface of the side wall 6 and flows out to both sides.

This is because at this time, the flow of the stock solution changes due to the flow path blocking member 7, and a large amount of the stock solution flows toward the side opposite to the flow path blocking member.

゛In addition, in another experiment, when we opened the injection port slightly near the top of the back wall and injected the urethane stock solution to foam, we found that there was an unfilled area at the lower corner of the back wall, and the ceiling of the box was slightly damaged. It was filled with hard urethane 7 ohm.

For this reason, when the flow path blocking member was adhesively fixed to the side wall gap located about 10 an away from the injection port toward the ceiling, and the foaming stock solution was injected and foamed, there were no unfilled areas.

Furthermore, as shown in Figure 3, the insulation box of the refrigerator is
When molding is performed by the hole injection method, the inner box 3 is assembled into the outer box 2 and positioned with the front opening facing upward.

Next, the injection port 3 is opened below the low wall portion 8 of the box, and the foaming stock solution is injected approximately horizontally toward the back wall portion 5 to foam and fill the insulating material.

However, too much of the foaming stock solution flowed into the filling gap in the ceiling of the box Q, resulting in many unfilled areas in the A part shown in the figure, that is, the front part of the low wall part 8 of the box.

For this purpose, a flow path blocking member 7 made of polyethylene or the like with a diameter of about 7.5 square rods is adhesively fixed in the back wall surface 5 facing the injection port 4, and then the foaming stock solution is injected and foamed. The flow was changed by the flow path blocking member 7, and the amount of filling into the filling gap of the box was made uniform, thereby making it possible to eliminate unfilled areas.

As mentioned above, this device is designed to provide flow path blocking members at necessary locations so that more of the foaming solution, such as polyurethane, flows toward the filling gap that is far from the inlet. The amount of filling into the filling gap of the box body can be made uniform by changing the filling amount, and the occurrence of unfilled areas can be prevented with a simple structure.

[Brief explanation of the drawing]

The drawings are all related to this invention; Fig. 1 is a perspective view of a heat insulating box showing an embodiment of this invention, Fig. 2 is an explanatory diagram showing a state diagram when foaming stock solution is injected into the box; Third
The figure is a perspective view of a heat insulating box showing another embodiment. 1 is a box body, 2 is an outer box, 3 is an inner box, 4 is an injection port, and 7 is a flow path blocking member.

Claims (1)

[Scope of utility model registration request] In a case where a foaming solution such as polyurethane is injected into the filling gap formed between the inner and outer boxes and the inner and outer boxes and foamed to form an insulating box, the above-mentioned foaming solution opposite to the injection port for the foaming solution such as polyurethane, etc. A flow path blocking member is provided in the filling gap, and the flow direction is changed so that more of the foaming stock solution flows toward the filling gap that is far from the injection port, and the stock solution is injected into the filling space and foamed. Insulated boxes for refrigerators, etc.