JPH01225886A - Heat insulating door - Google Patents

Abstract

PURPOSE:To prevent the separation of the door inner panel from a vacuum insulating pack from causing the door inner panel to deform by tightly fitting the joint of the cover film of the vacuum insulating pack to the protrusion formed on the rear of the door inner panel. CONSTITUTION:On the rear of the door inner panel 12, a rectangularly encircled protrusion 11 is formed in the proximity or in contact with the entire length of the joint 5a of the cover film 5 of a vacuum insulating pack P1. By means of the adhesive applied to the protrusion 11, the joint 5a of the cover film 5 of the insulating pack P1 is tightly fitted. Because of this, flon gas generated by the foaming agent during the injection foaming of a foam insulating material is prevented from being entrapped between the door inner panel and the vacuum insulating material, or the foam insulating material is prevented from intruding therein, and so, the door inner panel will not be separated from the vacuum insulating pack and will not deform.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a refrigerator in which a foam insulation material is injected and foamed between a door outer panel, a thick inner panel, and a vacuum insulation pack located between these panels. This article relates to heat-insulating doors such as those mentioned above.

<Prior art> Conventional insulated doors are used in refrigerator floors, freezers, etc. In order to improve their insulating performance, the vacuum insulation pack PI, which has a reduced internal pressure, as shown in Figure 9, has attracted attention and has been put into practice. has been done.

That is, the heat insulating door B has a metal door outer panel 1 and is arranged opposite to this door outer panel 1, and has a shelf around the central flat surface 2a. !
! 2b, a door frame 3 that connects the outer periphery of the door outer plate 1 and the thick inner plate 2, and an outer covering film that is closely fixed to the back side of the door inner plate 2. The vacuum insulation pack PI is covered with a vacuum insulation pack 5, and a foamed insulation material 4 is filled and foamed between the door outer panel 11, the door inner panel 2, and the vacuum insulation pack P1.

As this vacuum insulation pack PI, a bag is made of an outer cover film 5 having gas barrier properties such as a laminate film having an aluminum vapor deposited layer, and an inorganic filler such as perlite or a continuous organic foam is placed inside the bag as a core. The bag is filled with a material 6, and after reducing the pressure inside the bag, the joint part 5a of the bag is heat-sealed.

Next, the vacuum insulation pack Pl configured as described above is pasted with tape 7 or the like along the back side of the door inner panel 2 of the insulation 59B, and then the door outer panel 1. Interior board 2. A foamed heat insulating material 4 was injected and foamed into the space surrounded by the m frame 3 and filled.

Such a composite insulation door B uses the outer cover film 5 of the vacuum insulation pack PI, which has excellent heat insulation properties and a high heat insulation coefficient, as the door outer panel 1.
．． Since it is closely fixed to the door inner plate 2 by the closed-cell foam insulation material 4, it has both high-performance heat insulation and rigidity as a heat-insulated door.

Problems that the invention seeks to solve 〉However,
In the heat insulation door B having the above configuration, when the foam insulation material 4 is injected and foamed, the fluidity of the foam insulation material 4 is inhibited by the joint portion 5a (heat seal portion) of the vacuum insulation pack pi, and the vacuum insulation pack Air pockets such as voids are generated near the periphery of the PI, reducing the overall insulation performance.

Furthermore, not only does it reduce the insulation performance, but the fluorocarbon gas in the generated voids cools and depressurizes, causing dents in the door inner panel 2, making the appearance of the door inner panel 2 wavy, and causing important quality problems. arise.

In addition, if the surface of the central flat surface 5b of the outer covering film 5 of the vacuum insulation pack PT has wrinkles or irregularities, use adhesive to the central flat surface 2a of the door inner plate 2 to remove the vacuum insulation pack PI. When the central flat surface 5b of the outer sheathing film 5 was closely attached, it was not tightly fixed to the door inner plate 2 due to uneven adhesive application, and when the foam insulation material 4 was injected and foamed in this state, the door inner plate 2 and the vacuum The problem is that fluorocarbon gas generated by the foaming agent accumulates between the insulation pack PI and the foam insulation material 4 enters, causing the door inner plate 2 and the vacuum insulation pack PT to separate, causing the door inner plate 2 to deform. was there.

Therefore, in order to solve the above-mentioned conventional problems, the present invention has been developed to prevent fluorocarbon gas from accumulating between the door inner plate and the vacuum insulation pack and the foam insulation material from entering when the foam insulation material is injected and foamed. The purpose of the present invention is to provide an insulating door in which the inner door plate and the vacuum insulation pack do not peel off and the inner door plate does not become deformed.

<Means for Solving the Problems> The means for solving the problems according to the present invention is as shown in FIGS. A protruding part 11 is formed close to or in contact with the entire circumference of 5a (heat seal part), and the joint part 5a is closely fixed to the protruding part 11 via an adhesive or the like.

In the above-mentioned problem solving means, as shown in FIGS. 1 to 4, when the foam insulation material 4 is injected and foamed, fluorocarbon gas generated by the foaming agent is generated between the door inner plate 12 and the vacuum insulation pack pt. The door inner plate 12 and the vacuum insulation pack PI will not be separated from each other due to accumulation or intrusion of the foamed heat insulating material 4, and the door inner plate 12 will not be deformed.

<Example> The present invention will be described in detail below. First of all, Figures 1 to 4
A first embodiment of a heat insulating door used for a refrigerator or the like will be described based on the drawings. 1 is a cross-sectional view of the heat-insulating door, FIG. 2 is a perspective view of the external appearance, FIG. 3 is a cross-sectional view of the vacuum heat-insulating pack, and FIG. 4 is a perspective view of the vacuum heat-insulating pack.

Note that the same parts between the present invention and the conventional example are denoted by the same reference numerals.

As shown in the figure, the heat insulating door of the present invention includes a metal door outer plate l,
An inner door plate 12 made of synthetic resin that is arranged to face the outer door plate 1 and has a shelf wall 12b around a central flat surface 12a, and a door that connects the outer periphery of the outer door plate 1 and the inner door plate 12. The frame body 3, the vacuum insulation pack PI tightly fixed to the back side of the door inner plate 12 and covered with the outer cover film 5, the door outer plate 11, the door inner plate 12, and the vacuum insulation pack PI. It consists of a foamed heat insulating material 4 filled and foamed in between.

Then, on the back side of the door inner plate 12, a square annular protrusion ll is formed which is close to or in contact with the entire circumference of the joint portion 5a (heat seal portion) of the outer covering film 5 of the vacuum insulation pack PI. , the joint portion 5 is attached to the protruding portion 11 via an adhesive.
a is fixed.

Note that the protrusion 11 has a groove-shaped cross section, and has a height of 1
(2 is the flat surface 5b of the joint 5a of the vacuum insulation pack PI
The width dimension W2 of the tip surface 11a of the protrusion 11 is the same as or slightly smaller than the height dimension H1 (the surface in close contact with the back surface of the door inner plate 12).
It is formed slightly larger.

Next, to explain the manufacturing method of the above-mentioned heat insulating door AI, before filling the foamed heat insulating material 4 between the door outer panel 1, the door inner panel 12, and the door frame 3, first, the back side of the door inner panel 12 is Vacuum insulation pack p
t is tightly fixed and then foamed and filled. that time,
The central flat surface 5b of the vacuum insulation pack P1 is connected to the protrusion I of the internal plate 12! The joint portion 5a at the periphery of the vacuum insulation pack PI is brought into contact with the inner central flat surface 12a and tightly fixed to the protruding portion ll formed integrally on the back surface of the door inner plate 12 using a fixing material such as tape or adhesive. . By doing so, it is possible to fix the joint portion 5a of the vacuum insulation pack pt that obstructs the flow of foaming when the foaming insulation material 4 is injected and foamed, and the door inner plate 12
It is possible to prevent the foamed heat insulating material 4 from flowing in between the joint part 5a of the vacuum heat insulating pack Pl, prevent the deformation of the door inner plate 12, and prevent the foamed heat insulating material 4 from flowing in between the joint part 5a of the vacuum heat insulating pack Pi near the periphery of the joint part 5a of the vacuum heat insulating pack Pi. The generation of voids can be prevented, and the overall insulation effect can be prevented from deteriorating.

Next, a second embodiment of the present invention will be described with reference to FIGS. 5 to 8. Figure 5 is a cross-sectional view of vacuum insulation pack P2.
Figure 6 is an overall perspective view of the heat-insulating door, Figure 7 is a cross-sectional view of the heat-insulating door manufacturing equipment, and Figure 8 shows the manufacturing process of the inner jig, door inner plate, and vacuum heat-insulating pack. It is a perspective view shown in a separated state.

In the heat insulation door A2 of the present invention, the thin plate 2 [, which is the inner member of the outer cover film 5 of the vacuum heat insulation pack P2] is given magnetism to be attracted, and the vacuum heat insulation pack P is attached to the synthetic resin door inner plate 2.
Almost the entire surface of the flat portion 5b of the outer cover film 5 of No. 2 is tightly fixed in direct contact.

In addition, the door outer panel 1 made of metal, the internal panel 2 which is disposed opposite to the door outer panel 1 and has a shelf wall 2b around the central flat surface 2a, and the door outer panel 1 and the door inner panel. 2, the door outer panel 1, the door inner panel 2, and the vacuum insulation pack P.
The foamed heat insulating material 4 filled and foamed between the holes 1 and 1 is the same as that of the conventional example.

Further, the magnetizable material [21] is made of a rectangular thin iron plate,
It is fitted into the entire inner surface of the flat portion 5b of the outer cover film 5 of the vacuum insulation pack P2.

Next, a method of manufacturing the heat insulating door A2 of the second embodiment will be explained.

The inner jig 31 constituting the heat insulating door manufacturing apparatus is made by first creating a heat-resistant epoxy resin mold (not shown) using the vacuum molding mold for molding the door inner plate 2 as a master, and then molding the epoxy resin. RIM (reaction injection) hard urethane foam is inserted between the resin mold and another mold (not shown).
It is made by foaming and solidifying by molding) or R-RIM (reinforced rim) molding.

Then, when molding the inner jig 31, a magnetic body 32 is installed in a portion facing the vacuum insulation pack attached to the back surface of the door inner plate 2. The inner jig 31 having such a configuration is used as the outer jig 3.
3 to form a foaming jig.

Next, a method for manufacturing the heat insulating door A2 using the foaming jig having the above configuration will be explained. Inner jig 3 with the back side of the door inner plate 2 facing up! Charge to. Next, the vacuum insulation pack P2 is attached from above so as to be tightly fixed to the back surface of the door inner plate 2. At this time, as shown in FIG. 5, the vacuum insulation pack P2 has a core material 6 (made of pearlite powder or organic foam) inside, and a magnetized plate 21 (iron plate) on the negative side thereof. Moreover, it is constructed by being covered with an outer covering film 5 and the inside is sealed under reduced pressure, and since it is installed so that the magnetized plate 21 is placed downward, the magnetic force of the magnetic body 32 causes the back surface of the inside of the door 1 & 2 to be It is firmly attached and fixed in the specified position. That is, the outer cover film 5 of the vacuum insulation pack P2 is fixed to the door inner plate 2 in direct contact with its unevenness extended.

In this state, a liquid raw material for the foamed heat insulating material 4 is injected into the back side of the door inner plate 2 forming a container shape, and the liquid foamed heat insulating material 4 is stored in the back side of the door inner plate 2.

Thereafter, the exterior members such as the door frame 3 and the door outer panel 1 to be assembled together with the door inner panel 2 are placed so as to seal the upper opening of the door inner panel 2, and in this state, the outer jig lid 34 is Press from above.

By doing this, the liquid raw material for the foamed heat insulating material 4 stored inside the door inner panel 2 starts foaming and volumetric expansion, and gradually the door outer panel! , fills the space formed by the door inner plate 2 and the door frame 3. At this time, even if there are wrinkles or irregularities on the surface, the central flat surface 5b of the outer covering film 5 of the vacuum insulation pack P2 is moved to a predetermined position on the back surface of the door inner plate 2 by the magnetic force of the magnetic body 32. It is attached securely and securely to the That is, the outer cover film 5 of the vacuum insulation pack P2 is fixed to the door inner plate 2 in a direct contact state with its unevenness extended.

Once the foaming is completed in this way, the adhesive action of the foamed heat insulating material 4 allows these door panels! , while simultaneously joining the door inner plate 2 and the door frame 3 together, the vacuum insulation pack P2
is fixed in a predetermined position by the magnetic force of the magnetic body 32 installed in the inner jig 31, and is securely and securely attached to the back surface of the door inner panel 2 by the adhesive force of the foam insulation material 4 filled in the space. It is firmly fixed to form the heat insulating door A2 of the present invention.

As described above, in this embodiment, magnetism is imparted to the inner member 21 of the outer cover film 5 of the vacuum insulation pack P2, and the outer cover film 5 of the vacuum insulation pack P2 is attached to the synthetic resin door inner plate 2.
Since they are tightly fixed in direct contact with each other, deformation of the door inner plate 2 and, by extension, failure of sealing due to deflection of the entire heat insulating door A2 can be reliably prevented.

In addition, a magnetic material 32 is provided in an inner jig 31 of a manufacturing device for inserting and arranging the door inner plate 2, and when the door inner plate 2 is inserted into this inner jig 31, the magnetic material 32 is attached to the inner surface side of the door inner plate 2. A vacuum heat insulating pack P2 having a magnetized plate 21 on the negative side is placed so as to face the door body 32, and then a foamed heat insulating material 4 is injected and foamed inside the door inner plate 2 to achieve heat insulation. If the door A2 is manufactured, the installation of the vacuum insulation pack P2 will be extremely easy, and the material cost will be reduced as there is no need for fixing members such as adhesive or tape for temporarily fixing the vacuum insulation pack P2. Reduction and improvement of workability Furthermore, the flowability of the foamed heat insulating material 4 is not inhibited, and voids such as air pockets are not generated, and the heat insulating performance of the heat insulating door A2 can be maintained well.

Further, in the above embodiment, iron powder is mixed into the core material 6, which is the inner member of the outer covering film 5, or into the outer covering film 5 itself, as a means for imparting attracting magnetism to the vacuum insulation pack PI. Good too.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

<Effects of the Invention> As is clear from the above description, the present invention has a protrusion which is formed on the back side of the inner door plate and which is close to or in contact with the joint of the outer covering film of the vacuum insulation pack. The present invention relates to a heat insulating door in which the joint portion is tightly fixed to the portion. Therefore, according to the present invention, when the foam insulation material is injected and foamed, fluorocarbon gas generated from the foaming agent may accumulate between the door inner plate and the vacuum insulation pack, and the foam insulation material may enter the door. This has the excellent effect of preventing the board and vacuum insulation pack from peeling off and deforming the inner door panel.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the first embodiment of the heat-insulating door of the present invention, Fig. 2 is a perspective view of the external appearance, Fig. 3 is a cross-sectional view of the vacuum heat-insulating pack, and Fig. 4 is the same vacuum heat-insulating pack. FIG. 5 is a cross-sectional view of a vacuum insulation pack according to the second embodiment of the present invention, FIG. 6 is a perspective view of the entire heat-insulating door, and FIG. 7 is a cross-sectional view of the heat-insulating door manufacturing apparatus. , FIG. 8 is a perspective view showing the manufacturing process of the inner jig, the door inner plate, and the vacuum insulation pack in a separated state, and FIG. 9 is a cross-sectional view of a conventional insulation door. 1: Door outer plate, 2, 12: Door inner plate, 12a: Central flat surface,
12b: shelf wall, 3: door frame, 4: foam insulation material, 5: outer covering film, 5a: joint part, 6: core material, ll: protruding part, 2
1: Magnetized plate, Pi, P2: Vacuum insulation pack, AI,
A2: Insulated door. Applicant Sharp Corporation

Claims (1)

[Claims] A heat insulating door characterized in that a protruding part that is close to or in contact with a joint part of an outer cover film of a vacuum insulation pack is formed on the back side of the inner door plate, and the joint part is closely fixed to the protruding part. .