JP2530036B2 - Manufacturing method of heat insulation doors such as refrigerators - Google Patents

Description

Description: [Object of the invention] (Field of industrial application) The present invention relates to a method for manufacturing a heat insulating door such as a refrigerator, and a method for injecting a stock solution of foamed heat insulating material into the inside of a door body at times. It is about.

(Prior Art) Conventionally, as a method of injecting a stock solution of a foamed heat insulating material such as urethane foam (hereinafter referred to as a foamed stock solution) into a door body of a refrigerator or the like formed in a box having a flat rectangular shape, the following method is used. There is something like this.

That is, as shown in FIG. 5, the discharge part of the foaming undiluted solution H is arranged above the inner side surface of the horizontally mounted door body 110, and from the point A on the inner side surface of the door body 110 to the inner side of the other side surface. The foaming undiluted solution H was being injected while being horizontally moved relative to the point B. The foaming undiluted solution H injected into the interior of the door body 110 was filled in a substantially band shape when viewed from a plane.

(Problems to be Solved by the Invention) In the above-described conventional injection method, the foaming stock solution H is the door body.
Since it spreads like a strip inside 110, the distance C from the end of the foaming stock solution H to the door corner 124 is longer than the distance D from the foaming stock solution H in the center of the door body 110 to the side wall. .

Therefore, there is a problem that the amount of the foaming undiluted solution H injected into the four door corners 124 becomes small and an unfilled portion is generated.

Further, if the injection amount of the foaming undiluted solution H is increased in order to sufficiently spread the foaming undiluted solution H to the door corner portion 124, the door body is increased.
The amount of the foaming undiluted solution H near the center of 110 becomes excessive,
There was a problem that the foaming undiluted solution H leaked to the outside of the door body 110, or the door body 110 swelled or deformed. And
There was a problem that the cost would be high.

Therefore, the present invention does not increase the injection amount of the foaming stock solution H,
A method for manufacturing a heat-insulating door such as a refrigerator in which the foaming undiluted solution H is sufficiently spread over the entire inside surface of the door body.

[Structure of the Invention] (Means for Solving the Problems) In the method for manufacturing a heat insulating door of a refrigerator or the like according to the present invention, a foaming undiluted solution H is applied to a door body of a refrigerator or the like formed in a box having a flat rectangular shape.
While moving the discharge part of the
Is a method of injecting into the interior of the door body, in which the discharge part is located inside one side surface of the door body that is horizontally mounted, and the stock solution H is injected at this position for a required time, and the discharge part is relatively disposed from the inside of the one side surface. The stock solution H is injected into the inside of the door body while relatively moving to the inside of the other side surface that faces, and the stock solution H is injected at this position for a required time when the discharge portion is located inside the other side surface.

(Operation) According to the method for manufacturing a heat insulating door of a refrigerator or the like having the above-mentioned configuration, the foaming stock solution H is injected for a required time while the discharging portion of the foaming stock solution H is positioned inside one side surface of the door body and stopped. And
The foaming undiluted solution H is ejected from the discharge part and relatively moved from the inside of one side surface to the inside of the other side surface. After this,
When the discharge part is located inside the other side surface, stop the discharge part,
In this stopped state, the foaming stock solution H is sprayed for the required time.

According to the above method of injecting the foaming undiluted solution H, the injection amount of the foaming undiluted solution H in the vicinity of the inside of one side surface and the inside of the other side surface of the door body is larger than the injection amount in the central portion of the door body. Therefore, the distance from the end of the injected foaming undiluted solution H to the corner of the door body is approximately equal to the distance from the foaming undiluted solution H in the center of the door body to the side surface. The undiluted foaming solution H can be injected into the interior of the door body in good balance.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS.

Reference numeral 10 is a refrigerator compartment door used for the refrigerator.
This door 10 has a flat rectangular shape and has four side walls 12,14,1.
It is surrounded by 6, 18 and has a bottom surface 20 and an open top surface.
This bottom surface 20 corresponds to the front surface when installed in a refrigerator.

Reference numeral 22 is a nozzle-type ejection portion for injecting the foaming stock solution H. The discharge part 22 is configured so that the discharge port of the foaming stock solution H can be linearly moved downward. Further, the discharge unit 22 can control the discharge timing and the moving speed of the foaming stock solution H by the control device.

A method for injecting the stock foaming solution H into the door 10 using the discharge unit 22 having the above-described configuration will be described below.

Place the door 10 horizontally with the opening facing up. Next, the discharge part 22 is stopped at the central portion inside the side wall 12 of the door 10, that is, at the point A. In this stopped state, the foaming stock solution H is jetted for 0.2 seconds to 0.5 seconds. Then, the ejection unit 22 ejects the foaming undiluted solution H and moves it from the point A to the inside of the other side surface 14, that is, the point B in parallel with the side wall 16 in about 2 seconds. And the discharge part 22
When B moves to the point B, the foaming stock solution H is jetted again for 0.2 seconds to 0.5 seconds in a state where the foaming stock solution H is stopped at the point B, and thereafter, the injection of the foaming stock solution H is stopped. In the injection method described above, when the speed of the discharge part 22 and the position of the discharge part 22 on the door 10 are shown in a graph, the shape is almost trapezoidal as shown in FIG. The relationship between the position of the discharge part 22 on the door 10 and the discharge amount of the foaming undiluted solution H is shown in a graph. As shown in FIG. 3, the discharge amounts near the point A and the point B are the central portion of the door body. Is more than When the injection state of this foaming stock solution H is seen from the plane of the door 10,
As shown in the figure, since the amount of the foaming undiluted solution H at the point A and the amount of the unfoaming undiluted solution H at the point B are large, it is almost gourd-shaped. Distance from point A to corner 24 of door 10,
That is, in FIG. 4, the relationship between the distance C and the distance D to the side wall 16 of the foaming undiluted solution H at the central portion of the door body is substantially equal.

As a result, the state of injection of the foaming undiluted solution H in the door body 10 is
Well-balanced. Therefore, the state inside the door 10 after the foaming undiluted solution H has been foamed has no unfilled parts at the four corners 24, and there is no problem of abnormal swelling or deformation in the vicinity of the central part. It is possible to prevent the occurrence of Furthermore, since there is no concern about the unfilled portion in the corner portion 24 as in the conventional case, the injection amount of the foaming undiluted solution H can be reduced by 3% to 5%, resulting in cost reduction.

The injection amount when the foaming undiluted solution H is injected into the refrigerator door and the freezer door used in 400 refrigerators is shown in Table 1 in comparison with the conventional example and this example.

From the above, the method of manufacturing the heat insulating door of the present embodiment,
The amount of the foaming undiluted solution H injected into the interior of the door 10 can be reduced as compared with the conventional one, resulting in cost reduction.

In addition, in the above-mentioned embodiment, the discharge part is moved, but instead of this, the door 10 may be moved.

EFFECTS OF THE INVENTION According to the method for manufacturing a heat-insulating door of a refrigerator or the like of the present invention, the unfilled portion at the corner of the door body is eliminated, and the foaming undiluted solution can be injected into the door body in a well-balanced manner. Further, it is possible to prevent the occurrence of voids and the like.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and is an explanatory view showing a state of injecting while moving a discharge part to a door, and FIG. 2 shows a speed of the discharge part and discharge at a door. Fig. 3 is a graph showing the positional relationship between the foaming stock solutions and Fig. 4 is a graph showing the positional relationship between the foaming stock solution and the discharging section at the door. Fig. 4 is a plan view of the door with the foaming stock solution injected. The figure is a plan view of the door in a state where the foaming stock solution is injected by the conventional injection method. [Explanation of symbols] 10 …… door 12,14,16,18 …… sidewall 20 …… bottom surface 22 …… discharging part H …… foaming concentrate

Claims (1)

(57) [Claims] 1. A method of injecting a stock solution of foam insulation into a door body while moving a discharge part of the foaming stock solution relatively to a door body of a refrigerator or the like formed in a flat rectangular box. Then, the discharge part is positioned inside one side surface of the door body that is placed horizontally, and the stock solution is injected at this position for the required time, and the discharge part is relatively moved from the inside of the one side surface to the inside of the opposite side surface. At the same time, the method for manufacturing a heat-insulating door for a refrigerator or the like is characterized in that the stock solution is injected into the interior of the door body, and when the discharge portion is located inside the other side surface, the stock solution is injected at this position for a required time.