JPS613979A - Heat-insulating plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a heat insulating board used in a prefabricated heat insulating box such as a prefabricated refrigerator.

(b) Prior art For example, Japanese Patent Application Laid-open No. 55-27288 (hereinafter referred to as the first prior art 5) K discloses a method of manufacturing a heat insulating board.

However, the first prior art trap is ignored.

When injecting and foaming the insulation material, it is necessary to attach a tube to the jig for air venting, and after foaming, it is necessary to remove the tube, which increases the number of man-hours and makes the work complicated. Each time the gourd is manufactured, the gourd is discarded, resulting in an increase in parts costs.

Further, JP-A-56-58837 (hereinafter referred to as the second prior art) discloses a method for manufacturing a heat insulating board, and the second prior art does not require a cheap heat insulating material unlike the first prior art. can perform injection foaming work. The connecting member used in this manufacturing method projects outward from a part of the frame body, forms a cylindrical ventilation hole that communicates the space between the two plates with the key chamber, and is provided with a ventilation member that covers this ventilation hole. The air between the inner and outer plates is discharged to the outside through the lock chamber. However, when a stock solution of a foam insulation material with a high expansion ratio made by the convection method, or a stock solution with a large injection amount to increase the foaming density, is injected between the inner and outer plates, just before the foaming is finished, the air permeable member A portion of the impregnated foam insulation material enters the cylindrical ventilation hole, passes through the ventilation member, and leaks into the lock chamber, causing the rotation function of the internal hook,
Otherwise, this resulted in a drawback that the locking function of the pin was inhibited.

(c) Purpose of the invention.

It is an object of the present invention to reduce the number of parts during the manufacture of heat insulating plates, to smoothly discharge gas between the inner and outer plates, and to prevent malfunctions of the connecting device.

2) Structure of the Abandonment ゛The present invention is a heat insulating board as claimed in the claims, which allows the gas between the inner and outer boards to be discharged to the outside from the ventilation path without passing through the lock chamber when the heat insulating material is injected and foamed. This prevents the heat insulating material from entering the lock chamber of the coupling device, and prevents the foamed heat insulating material from interfering with the rotating function of the hook and the locking function of the pin within the lock chamber.

(e) Example An example of the present invention will be described below with reference to FIGS. 1 to 9.

Figure 2 (, 1) shows a prefabricated insulating box for refrigerators, freezers, refrigerators, etc., which is constructed by interconnecting multiple heat insulating plates (21 (2+)... A heat insulating door (3) which can be opened and closed is provided at the opening, and a cooling device (not shown) necessary for cooling the inside of the refrigerator is provided.

As shown in FIGS. 2 and 3, the heat insulating board has two inner and outer plates (4) (51) each having bent sides (4a x 5a) opposite to each other on the end surfaces, and a spacer filled between the two plates. and a foamed heat insulating material (6) made of hard polyurethane or the like, and a bent side (4a
) (5a) A concave part (7) recessed inward from the space between the bending sides (4a) and (5a), and a convex part (7) protruding outward from the bent side (4a) and (5a) on the other side.
8) is integrally formed with the heat insulating material. (91f[0
) are flexible joint members provided on the bent sides (4a) and (5a).

θI) (II) is the concave part (7) and the convex part (
8), each of which is a pair of connecting devices embedded in each of the holes, for example, a frame body a'aa'a integrally formed of resin and a vent cylinder α.
Each key chamber α31a, i is equipped with either a pin (14) or a hook (LS), and has an insertion hole (1) formed in the heat insulating material (6).
6) Insert the handle (not shown) and hook Q5
1, the hook a9 loosely engages the pin (14) and then attracts the pin Q41.
．． As shown in Figure 5, it has a mechanism for firmly connecting and connecting the opposing heat insulating plates (2) (2).

Also, ventilation cylinder a7) Q? ) is formed with a cylindrical ventilation passage (country α&) which is parallel to and adjacent to each frame body 02a2 and is orthogonal to the opening of the key chamber (131 (131), and one end of these ventilation passages is connected to the recess (7) and Connection end surface (7A) of convex portion (8) (8
A), and the other end opens between the inner and outer plates (4) and (5).

Furthermore, the ventilation cylinder a? ) is used in prefabricated insulation boxes for refrigeration, and when the thickness of the insulation material is thin, such as a poor insulation board, it is formed on one side edge of the frame α as shown in Figure 1. When the heat insulating material is thick, such as the heat insulating board used in the prefabricated heat insulating box for (11A) of the coupling device aυ shown in FIG. 6 is a flange on the connection end side, (II
B) is the flan on the insulation side.

Next, we will discuss the manufacturing method of the heat insulating board (2) having the above structure.
This will be explained with reference to the drawings and FIG. In addition, ■ is a foaming jig whose inner surface is coated with a mold release agent and which can be attached and detached, and each jig is attached to the frame 02.
It is provided with a locking tool for releasably locking one of the sides of the insulating material (6), and also has a locking tool on one side (20A) formed by forming an injection hole (2 holes) for injecting the undiluted solution of the heat insulating material (6). A through hole (C) (C) corresponding to the vent surface of the frame is formed between the stops.

H(25)+*This is a foaming substrate and a pressure plate that are in contact with both the inner and outer plates (4) and (5).

The manufacturing method of the heat insulating board (2) is to use a connecting device Ql) to connect the periphery and outer surface of both the inner and outer plates r4) (5) arranged with a gap between them.
(Cover with the foaming jig (A), the substrate (Foundation) and the pressure plate (C) to which lυ is attached, and inject the undiluted solution of the insulation material (6) through the injection hole (2). ) gradually foams and expands. At this time, the air between the inner and outer plates + 4) (51 and the insulation material (6
) is pressed as the heat insulating material (6) expands, flows toward the ventilation path αQθ seconds as shown by the arrow in FIG. The negative part of the insulation material (6) enters the ventilation passage (11) as shown by the dashed line in FIG. Since (6) is in the final stage of foaming and the foaming pressure has decreased, it slowly advances through the air passage, gradually cools down and becomes more viscous, and the foaming ends within the air passage. After completing the work, the foaming jig (a), the substrate (24), and the pressure plate (to) are removed to complete the heat insulating plate (2) incorporating the connecting device Ql) (11).

In addition, as shown in FIGS. 7 and 9, by appropriately forming, for example, an annular convex portion (17A) approximately in the middle of the ventilation path (lE9), the speed of air and gas removal is slowed down, and the convex portion The portion (17A) acts as a resistance for the heat insulating material (6) to move through the air passage α~.

According to the above-mentioned heat insulating board (2), even when the amount of undiluted solution of the insulating material (6) is increased to increase the foaming density, the foaming of the insulating material (6) does not occur as air and gas are removed. Since it ends within the ventilation path aυ, there is no need to provide a ventilation member to stop the heat insulating material (6) at the opening (opening) of the ventilation pipe (171).
In addition to reducing the number of parts, it is possible to reduce the number of parts.
), work was carried out to remove leaked insulation material.

You don't have to.

Furthermore, the key room 03 and the air passage (marked 1) are separated from each other, and the key room (
1, 4 (l) Since the gas is discharged to the outside from the entrance of the ventilation path α, the insulation material (6) never enters the lock chamber a (therefore, the foam insulation material inside the lock chamber This solves the drawback of the prior art that the pin αa of the coupling device Q1)Ql) or the hook Q51 interferes with its function.

(f) Effects of the Invention The present invention provides for a key chamber defined by a frame body by arranging both the inner and outer plates at a distance from each other, and filling the space between the inner and outer plates with a foamed insulating material. A heat insulating board that houses at least one of a hook and a pin forming a housing, and has a connecting device that opens one end to a connecting end surface, and is adjacent to the frame body and isolated from the key chamber, and has one end thereof opened. It is a heat insulating board characterized by forming a cylindrical ventilation path in the connecting device, which is open at the connecting end surface and opened at the other end between the two plates to exhaust the gas between the two plates to the outside during foaming. When the material is foamed, the air and gas between the inner and outer plates are exhausted to the outside only from the air passage without passing through the lock chamber. As a result, even if the four foaming conditions are different, the foam insulation material does not remain inside the lock chamber. There is no intrusion at all,
It is possible to avoid the functional obstruction of the connecting device due to foaming, and the mechanical strength of the frame itself is improved due to the formation of adjacent air passages.

It also has the additional effect of improving its strength against foaming pressure and preventing deformation during foaming.

[Brief explanation of the drawing]

Figures 1 to 9 show one embodiment of the present invention, with Figure 1 being a perspective view of a coupling device, Figure 2 being a perspective view of a heat insulating box made of heat insulating plates, and Figure 3 showing the heat insulating plates. Perspective view, Figure 4 is Figure 8
5 is a sectional view taken along line C-C in FIG. 8, FIG. 6 is a perspective view of a coupling device shown as another embodiment, and FIG.
The figure is a vertical sectional view of the main part of the connecting device shown in FIGS. 1 and 6, FIG. 8 is a schematic perspective view of the device used in manufacturing the heat insulating board according to the present invention, and FIG. 9 is the same as the one shown in FIG. 8. It is a sectional view taken along the line CC. (2)...Insulation plate, f4) (51...Both inner and outer plates,
(6)...Insulation material, α...pin, (1...hook, (l...ventilation path) Fig. 1 Fig. 2 Fig. 5 Fig. 116 Fig. 7

Claims (1)

[Claims] 1. Both the inner and outer plates are arranged with a gap between them, and a heat insulating material is foamed and filled between the inner and outer plates to form a pair in the key chamber defined by the frame. A heat insulating material having a built-in connecting device that accommodates at least one of a hook and a pin and has one opening at a connecting end surface, which is adjacent to the frame body and isolated from the key chamber, and has one end connected to the connecting device. A heat insulating board characterized in that a connecting device is provided with a cylindrical ventilation path that is open at one end and between the two boards at the other end to exhaust gas between the boards to the outside during foaming. 2. The heat insulating board according to claim 1, characterized in that a plurality of said ventilation passages are provided.