JPH0489216A - Manufacture of heat insulated body - Google Patents

Abstract

PURPOSE:To fill foam heat insulating material raw liquid well even in the corners of the inside of an outer shell by, injecting the liquid into the outer shell of a heat insulated body by means of an injection machine with its head section oscillating left and right. CONSTITUTION:A head section 15 of an injection robot 13 as an injection machine is provided to be able to oscillate at the end of an arm 14. The head section 15 is inserted into an injection port 12, and raw liquid 17 of a foam heat insulating material is discharged out of the head section 15 while said head section 15 is oscillated reciprocatingly in a continuous manner. As the head section 15 is oscillated left and right, said raw liquid 17 is injected stretching in the width direction of the outer shell 11. After that, said raw liquid 3 is stretched over while being foamed. The raw liquid 17 is filled sufficiently even in the corners without increasing the injection volume by said arrangement, and the time for the completion of filling is shortered. Also, as the filling can be carried out only by a single head section 15, the number of the injection ports 12 can be only one, and its appearance is better with the case of forming a plurality of injection ports.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Field of Application) The present invention is directed to injecting a foamed insulation material stock solution into the inside of a heat insulation body outer shell, and solidifying the foamed heat insulation material by foaming and solidifying the foamed heat insulation material stock solution. The present invention relates to a method for manufacturing a heat insulator.

(Prior Art) For example, a heat insulator for a refrigerator is manufactured as shown in FIGS. 5 to 7. As shown in FIG. 5, when the outer shell 1 of the heat insulator is placed on its back, the fixed head is inserted into the injection port 1a formed in the center of the fifth fixed part of the outer shell. 2, and the foam insulation material stock solution 3 is applied by this head part 2.
I am trying to inject it. The state immediately after this injection is shown in FIG. 7(a). This stock solution 3 sequentially foams, spreads inside the outer shell 1 in the width direction (see FIG. 2(b)), and solidifies. In this way, a heat insulator is manufactured.

(Problems to be Solved by the Invention) Recently, refrigerators have become larger, and in particular, the width dimension W (see FIG. 6) has become larger. However, in the conventional manufacturing method for heat insulators, the spread of the injected stock solution 3 in the width direction depends on its own foaming, so when the width dimension of the outer shell 1 increases, the corners of the outer shell 1 Problems arise in which the foam insulation material is not filled until the end. If this is to be prevented, the amount of injection of the stock solution 3 must be increased, which increases the amount of stock solution used and increases costs. Furthermore, excessive injection results in a longer curing time, resulting in a decrease in productivity.

As another countermeasure, as shown in Fig. 8,
It is conceivable to increase the number of injection holes, but this would increase the equipment cost for injection and also require a plurality of injection ports 1a to be formed in the outer shell 1, which would reduce manufacturability and deteriorate the appearance.

The present invention has been made in view of the above circumstances, and its purpose is not only to be able to satisfactorily fill every corner of the inside of the outer shell with foam insulation, but also to avoid increasing the amount of foam insulation used. To provide a method for manufacturing a heat insulating body without reducing productivity or increasing equipment costs.

[Structure of the Invention (Means for Solving the Problems)] The present invention provides a method for manufacturing a heat insulating body by injecting a foamed heat insulating material stock solution into the inside of a heat insulating body outer shell and foaming and solidifying the foamed heat insulating material stock solution. The feature is that the foamed insulation material stock solution is injected using an injection machine that is configured to be able to swing left and right.

(Function) According to the above means, by swinging the head portion from side to side, the stock solution of the foamed heat insulating material injected from the head portion into the inside of the outer shell spreads in the width direction of the outer shell and is injected. After this, the undiluted solution foams, or in this case, since the undiluted solution has already spread, the foamed insulation does not need to be increased in injection amount, unlike when it is concentrated in one part. The foaming action ensures that every corner is thoroughly filled. Also, the time required to complete the filling is short.

Furthermore, since only one head is required, an increase in equipment costs can be suppressed, unlike the case where a plurality of heads are used, and the number of injection holes formed in the outer shell is also small, resulting in a good appearance.

(Embodiment) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

First, in FIG. 2, the outer shell 11 of the refrigerator insulator is placed on its back, and on the left side of the outer shell 11 there is a third
As shown in the figure, one injection port 12 is formed in the center. The injection robot 13, which is an injection machine, has an arm 14.
A head portion 15 is swingably provided at the tip of the head, and the head portion 15 is driven left and right by a swinging mechanism 16 as shown in FIG.

The injection of foamed heat insulating material will now be explained.

Now, the head part 15 is inserted into the injection port 12, and the stock solution 17 of the foamed heat insulating material is discharged from the head part 15 while continuously swinging the head part 15 back and forth. This stock solution 17 is injected while spreading in the width direction of the outer shell 11 because the head portion 15 swings from side to side. After this, the stock solution 3 foams and spreads accordingly. In this case, since the stock solution 17 has already spread in its injected state, unlike the case where it is injected concentratedly in one part,
Even without increasing the amount of foamed insulation to be injected, the foamed insulation can be sufficiently filled into every corner due to its foaming action. Also, the time required to complete the filling is shortened.

Also, since only one head section 15 is required, an increase in equipment costs can be suppressed, unlike when multiple head sections are used.
Further, the number of injection holes 12 formed in the outer shell 11 can be reduced, and therefore the appearance is better than when a plurality of injection holes are formed.

In the above embodiment, the injection was carried out with the outer shell 11 substantially horizontal, but the injection may be carried out with the outer shell 11 tilted as shown in FIG. 4 as a second embodiment of the present invention.

Also, the head part may be oscillated continuously, or the left,
It may be arranged to stop at the center and the right, respectively, and then swing.

[Effects of the Invention] As is clear from the above description, the present invention is capable of manufacturing a heat insulating body by injecting a foamed heat insulating material stock solution into the inside of a heat insulating body outer shell and foaming and solidifying the foamed heat insulating material stock solution. This method of manufacturing a heat insulator is characterized by injecting the foamed heat insulating material stock solution using an injector configured to be able to swing from side to side. In addition to being able to satisfactorily fill up to 100% of foam, it also has the excellent effect of not increasing the amount of foamed heat insulating material used, without reducing productivity, and without increasing equipment costs.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a cross-sectional plan view of the head insertion portion, FIG. 2 is a vertical cross-sectional side view showing one state during manufacturing, and FIG. Figure 3 is A in Figure 2.
- It is a sectional view along the A line. FIG. 4 is a side view corresponding to FIG. 2 showing a second embodiment of the present invention. 5 to 7 show a conventional example, FIG. 5 is a vertical sectional side view showing one state during manufacturing, FIG. 6 is a front view seen from the direction of arrow C in FIG. 5, and FIG. (a) is a cross-sectional plan view taken along line B-B in Figure 5 to show how the stock solution is injected; Figure 7 (b) is a view corresponding to Figure 7 (a) showing the foaming state of the stock solution; FIG. 8 is a cross-sectional plan view showing a different conventional example. In the drawings, 11 is an outer shell, 12 is an injection port, 13 is an injection robot (injection machine), 15 is a head portion, and 17 is a stock solution. Agent Patent Attorney Tsuyoshi Sato

Claims (1)

[Claims] 1. A foam insulation material stock solution is injected into the inside of the heat insulation body outer shell, and a heat insulation material is produced by foaming and solidifying the foam insulation material stock solution.The foam insulation material is injected using an injection machine whose head part is configured to be able to swing from side to side. A method for manufacturing a heat insulating body, characterized by injecting a raw material solution.