JPH06159915A - Heat insulating door - Google Patents

Abstract

PURPOSE:To provide a heat insulating door whose vacuous heat insulating body is formed to conform with the shape of the door so closely as to leave no space between the heat insulating body and the inner door plate or so rigidly as to eliminate the need for the inner and outer door plates. CONSTITUTION:A heat insulating body 9 to be enclosed with an outer door plate 6 and a resin-made inner door plate 7 consists of a formable bag-like paper material 11, an inorganic porous filling material 12 filled in a bag-like part of the paper material 11 and a resin-made covering member 13 enclosing the paper material 11 therewith. This heat insulating body 9 is formed to conform with the shape of part enclosed with the outer and inner door plates 6 and 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating door using a vacuum heat insulating material filled with a filler of an inorganic porous material.

[0002]

2. Description of the Related Art Jitsuko 38-8678 prior to the present invention
The publication discloses a refrigerator in which a flat-plate heat insulating wall filled with a decompressed gas and a gas-absorbing powder substance is attached inside a door of the refrigerator. And, the gap between the inner and outer linings of the door and the heat insulating wall is filled with a cold insulating material as necessary,
It is filled with foam insulation.

Japanese Patent Publication No. 4-1946 which precedes the present invention.
No. 5 publication prevents the depressurized heat insulating material contained in the box from being displaced due to the foaming pressure of the foam heat insulating material, and prevents the heat insulating performance of the panel from becoming nonuniform or deteriorated. A composite insulation panel is disclosed.

[0004]

In the refrigerator of the above-mentioned former publication, since it is necessary to fill each gap with a cold insulating material or a foam insulating material, the work of filling the cold insulating material or the foam insulating material is troublesome, and a door pocket is provided. Because of the relationship, the inner plate of the door (that is, the inner lining) is formed in a complicated shape, so the gap between the flat heat insulating wall and the inner lining also has a complicated shape, and it is possible to successfully close this gap with a cold insulation material or foam insulation material. It has a difficult drawback. By the way, there is a problem that dew condensation is likely to occur in this gap and the heat insulating performance is remarkably deteriorated as compared with the case where only the foam heat insulating material is filled. Furthermore, in order to secure the strength of the door, the cold insulating material housed in each gap and the heat insulating wall must be connected by some kind of reinforcing member, which is not only a troublesome work but also a part that can not be connected, and the strength is reduced. There was a problem to do.

On the other hand, even in the composite heat insulating panel of the latter publication, the pressure reducing heat insulating material has to be formed in a complicated shape due to the provision of the door pocket, but no consideration is given to the molding of the pressure reducing heat insulating material in the complicated shape. There is a problem that the depressurized heat insulating material cannot be formed into a complicated shape.

Therefore, in the present invention, the vacuum heat insulator is formed into a shape that matches the shape of the door to prevent a gap from being formed between the vacuum heat insulating material and the door inner plate, while omitting both the inner and outer door plates. The purpose is to provide a highly insulated door.

[0007]

SUMMARY OF THE INVENTION The present invention provides a heat insulating door of a refrigerator comprising a door outer plate, a resin door inner plate, and a heat insulator housed between the inner and outer door plates. The heat insulating body includes a bag-shaped moldable paper material, a filler of an inorganic porous material filled in the bag-shaped portion of the paper material, and a resin-made covering member for covering the paper material. The present invention provides a heat-insulating door in which a heat-insulating body is molded into a shape surrounded by both inner and outer door plates.

Further, according to the present invention, a container is formed in the outer shape of the door, and a filler made of an inorganic porous material is injected into a resin-made covering member, and the inside is vacuum-sealed by a vacuum heat insulator. It is intended to provide a heat-insulating door configured as.

[0009]

According to the heat insulating door of the first aspect of the present invention, since the heat insulating body is formed into substantially the same shape as the shape of the portion surrounded by the inner and outer door plates, the inner and outer door plates are covered with the covering member. It can be used as a mold at the time of molding, and the heat insulator can be housed without a gap between the inner and outer door plates.

According to the heat insulating door of the second aspect of the present invention, both the inner and outer door plates can be omitted, and the weight of the door and the heat insulating performance can be improved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 is a heat-insulating box body having a front opening as a refrigerator body, and this heat-insulating box body 1 is stored in a space portion surrounded by a metal outer box 2, a resin inner box 3 and both inner and outer boxes. And a vacuum heat insulator 4 as a heat insulating material. Insulation box 1
The front opening is closed by a heat insulation door 5, and the portion surrounded by the heat insulation box 1 and the heat insulation door 5 becomes a storage chamber.

The storage chamber is partitioned vertically or horizontally by partition members such as partition walls and shelves. The inner box 3 is provided with irregularities for attaching the partition members and irregularities for accommodating ducts and parts. Therefore, the inner box 3 has a complicated cross-sectional shape as shown in FIG. In addition, a surface of the heat insulating door 5 on the storage chamber side is formed with a protruding wall in the up-down direction and the left-right direction in order to create a pocket space with the partition member.

The heat insulating door 5 includes a metal door outer plate 6 and a resin door inner plate 7 having a complicated shape formed with the above-mentioned protruding wall and the like.
And a resin-made door frame 8 that connects the ends of both the inner and outer door plates and is provided with a sealing member such as packing, and is housed in a space portion surrounded by the inner and outer door plates 6, 7 and the door frame 8. It is composed of a vacuum heat insulator 9 as a heat insulator.

The vacuum heat insulating body 9 covers the paper material 11 in the form of a bag, the filler 12 of the inorganic porous material filled in the bag-like portion of the paper material 11, and the paper material 11. And a covering member 13 made of resin. In addition, the vacuum insulator 9
It is formed to have substantially the same shape as the outer shape of the space portion surrounded by the inner and outer door plates 6 and 7 and the door frame 8.

As the paper material 11, for example, kraft pulp or non-woven fabric is suitable, and non-woven fabric is used in this embodiment. In this embodiment, the covering member 13 is made of vinylidene chloride having a resin surface on which a metal such as aluminum or stainless steel is vapor-deposited. If metal vapor deposition is applied to the inner surface of the paper material 11, the gas molecules that have permeated the covering member 13 are less likely to permeate the paper material 11, heat transfer due to radiation is suppressed, and the paper material 11 is deteriorated. Can be suppressed.

As the filler 12 in this embodiment, particles of calcium silicate which are lightweight, inexpensive and have low thermal conductivity for reducing heat transfer due to conduction, and reflection for reducing heat transfer due to radiation of electromagnetic waves. A mixture of metal particles such as alumina having a low rate and zeolite particles for adsorbing gas molecules to reduce heat transfer due to convection is adopted. As the adsorption pores of the zeolite particles, there are usually 3 angstroms to several tens of angstroms. In this example, since these pores have 4 angstroms, the molecular size is 3.5. Both carbon dioxide gas of about angstrom and water vapor of 2.8 angstrom can be adsorbed.

Next, the procedure for manufacturing the heat insulating door 5 will be described. First, the procedure for producing the vacuum heat insulator 9 will be described. First, a bag-shaped paper having a volume slightly larger than the inner volume of the space surrounded by the inner and outer door plates 6 and 7 and the door frame 8 and having both ends open. A material 11 is prepared, and first molds 14 and 15 in which a recess having a shape slightly smaller than the outer shape of the space is formed.
The paper material 11 is fixed to. The hopper 16 injects the filling material 12 from one end of the paper material 11 while the paper material 1
By sucking air in the paper material from the other end side of the sheet 1 by the suction device 17, the paper material 11 is uniformly filled with the filling material 12 to seal both ends of the paper material 11. In this step, the shape of the paper material 11 is formed into substantially the same shape as the outer shape of the space portion. The number of inlets for the filling material is not limited to one, and the number of inlets may be appropriately set according to the shape and volume of the door.

After this, the paper material 11 filled with the filler material 12
Is taken out from the first molds 14 and 15 and is housed in a bag-shaped covering member 13 having one end opened, and the covering member 13 and the paper material 1 are
After the air between 1 and 1 is evacuated to about 10 -1 Torr by the vacuum device 18, one end side of the covering member 13 is heat-sealed by a heat-sealing device (not shown) so that the outer shape of the space is almost the same as the outer shape. A vacuum-sealed container of the same shape (that is, the vacuum heat insulating body 9) is completed. The covering member 13
When the paper material 11 is formed into a shape substantially the same as the outer shape of the paper material 11, after the paper material 11 is housed in the covering member 13, the covering member 13 is put into the above-described molds 14 and 15 to cover the covering member 13.
The air between the paper and the paper material 11 is about 10 -1 Torr by the vacuum device 18.
Needless to say, if the material is vacuumed to a certain degree, it is easier to mold than the above-mentioned method.

Then, a hot melt adhesive containing a thermoplastic resin (for example, polypropylene) as a main component is applied to the surface of the vacuum heat insulating body 9, and the vacuum heat insulating body 9 in this state is applied to both the inner and outer door plates 6, 7 and the door. If it is housed in the space surrounded by the frame 8, the vacuum heat insulating body 9, the inner and outer door plates 6, 7 and the door frame 8 are tightly fixed to each other with the above-mentioned adhesive, and the heat insulating door 5 containing the vacuum heat insulating body is completed. (See Figure 1).

According to the above manufacturing method, both the inner and outer door plates 6,
In addition to being able to form the vacuum heat insulator 9 housed in the space portion surrounded by 7 and the door frame 8 into substantially the same shape as the outer shape of the space portion, the vacuum heat insulator 9 and the inner and outer door plates 6, 7 and the door There is no gap between the frame 8 and the frame 8. Also, since the ratio of convective heat transfer is smaller in a vacuum heat insulating material than in a foam heat insulating material, if it is assumed that the heat transfer due to radiation and conduction are the same in both cases, the difference between this convective heat transfer causes the vacuum heat insulating material to foam. Has a lower heat transfer coefficient than the insulation. Therefore, the thickness of the heat insulating door of the present invention can be made thinner than the thickness of the heat insulating door filled with the conventional foamed heat insulating material, and the weight reduction of the door can be promoted.

4 to 7 show another embodiment of the heat insulating door of the present invention, in which the covering member 21 substitutes a metal door outer plate and a resin door inner plate for both door plates. In addition to the abolition, the mold for molding both door plates is abolished.

That is, a filler 22 made of an inorganic porous material is injected into a container-shaped resinous covering member 21 formed on the outer shape of the heat insulating door 19, and the inside is vacuum-sealed to form a vacuum heat insulator. The heat insulating door 19 is configured.

Next, a procedure for manufacturing the heat insulating door 19 will be described. First, when a resin material such as ABS resin (acrylonitrile butadiene styrene resin) or PPO resin (polyphenylene oxide resin) is added, a tubular molded article 24 is obtained.
An extruding device 23 (usually called a die) that is led out (usually called a parison) and second molds 25 and 26 provided with recesses 25A and 26A having the same shape as the outer shape of the heat insulating door 19 are prepared. .

Then, from the extrusion device 23 to the cylindrical molded product 24.
Is led out to a portion (see P in FIG. 4) slightly larger than the recesses 25A and 26A of the second molds 25 and 26, the tubular molded product 24 is sandwiched by the second molds 25 and 26. Next, as shown in FIG. 5, the intake pipe 27 of the extrusion device 23
From the above, compressed air is injected into the cylindrical molded product 24 to mold the cylindrical molded product 24 into the shape of the recess, and the covering member 21 with both ends open.
(That is, the covering member 21 having the same shape as the outer shape of the heat insulating door 19 is formed by the blow molding method).

After that, the filler 22 is injected into the covering member 21 from one end side of the covering member 21 by the hopper 28, while
By sucking the air in the covering member with the suction device 29 from the other end side of the covering member, the covering member 21 is uniformly filled with the filling material 22, and the other end side of the covering member 21 is heated (not shown). Heat seal with a sealing device.

Next, the inside of the covering member filled with the filling material 22 from the one end side of the covering member 21 by the vacuum device 30 is about 10 -1.
After evacuating to about Torr, one end of the covering member is heat-sealed by a heat-sealing device.
The shape is almost the same as the outer shape of the insulation door as shown in, and
A vacuum heat insulator filled with the filler 22 is completed. This vacuum heat insulator may be used as it is as the heat insulating door 19.

According to the heat insulating door 19 as described above, since the covering member 21 forms the outer surface of the door, the strength of the panel and the strength as a panel can be obtained by appropriately setting the thickness of the covering member 21 (for example, about 3 mm). Impact resistance performance can be remarkably improved as compared with the conventional door outer plate and inner door plate, and the door is sufficiently lightweight as compared with the above-mentioned first embodiment and the conventional heat-insulating door filled with the foam insulation material. Can be converted. Further, since the covering member 21 is formed by the blow molding method, if a metal part of the door (for example, a hinge fitting) is inserted during the blow molding,
It is possible to manufacture a heat insulating door that integrates metal parts, and reduce the number of door assembling steps.

[0028]

According to the heat insulating door of claim 1 of the present invention, since the heat insulating body is formed into substantially the same shape as the shape of the portion surrounded by the door inner plate and the door outer plate, the heat insulating body can be formed inside and outside. There is no gap between the heat insulator and the two door plates when storing between the two door plates, and the work of closing this gap and the work of connecting the member and the heat insulator that close the gap can be eliminated, and both the inside and outside door plates The work of accommodating the heat insulating material in the space can be easily performed, and the problem that the heat insulating performance is deteriorated is eliminated even compared with the conventional heat insulating door filled with the foam heat insulating material.

According to the heat insulating door of claim 2 of the present invention, not only the heat insulating performance can be improved as compared with the conventional heat insulating door filled with the foamed heat insulating material, but also the inner and outer door plates and the mold for molding both plates are formed. It can be omitted, and the number of steps for assembling the door can be reduced and the weight of the door can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a heat insulating door showing a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view illustrating a procedure for injecting a filler into a paper material and forming the paper material.

FIG. 3 is a cross-sectional view illustrating a procedure for manufacturing a vacuum heat insulator.

FIG. 4 is a cross-sectional view showing the manufacturing procedure of the heat insulating door of the second embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a blow molding method of a covering member.

FIG. 6 is a cross-sectional view showing a procedure for injecting a filler into the covering member.

FIG. 7 is a cross-sectional view showing a vacuum heat insulating body after evacuation work and completion.

FIG. 8 is a vertical cross-sectional view of the heat insulation box of the present invention.

[Explanation of symbols]

 5 Insulation Door 6 Door Outer Plate 7 Door Inner Plate 9, 19 Vacuum Insulator 11 Paper Material 12, 22 Filling Material 13, 23 Covering Member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Kurokami 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (2)

[Claims] 1. A heat-insulating door of a refrigerator comprising a door outer plate, a resin inner door plate, and a heat-insulating body housed between the inner and outer door plates, wherein the heat-insulating body has a bag shape. A moldable paper material, a filler of an inorganic porous material filled in a bag-shaped portion of the paper material, and a resin covering member for covering the paper material. A heat-insulating door characterized by being molded into the shape of the part surrounded by. 2. A door is constituted by a vacuum heat insulator whose inside is vacuum-sealed, in which a filler made of an inorganic porous material is injected into a container-shaped resin-made covering member having an outer shape of the door. A heat-insulating door characterized by that.