JP2000314586A - Structural member, method of manufacturing the same, and refrigerator using the structural member - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To form a structure that allows attachment of a through part, to reduce the degree of vacuum inside the outer shell, to suppress the invasion of gas in the atmosphere, and to maintain the heat insulation performance. To obtain a structural member of a heat insulating structure, a method of manufacturing the same, and a refrigerator using the structural member. SOLUTION: In a heat insulating structure provided with a filler 11 having a cellular structure inside an outer shell 1, one of the outer shells 1 is formed by a molded article having a hollow portion formed by closely contacting the periphery of two or more sheets. The part was composed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-insulating structure in which a heat-insulating wall is provided with a filler as a heat-insulating material and is kept in a vacuum state. TECHNICAL FIELD The present invention relates to a structural member having a porous filler and having a structure, a method of manufacturing the structural member, and a refrigerator using the structural member.

[0002]

2. Description of the Related Art FIG. 6 is a longitudinal sectional view showing an example of a conventional heat insulating structure of a refrigerator. This heat insulating structure is an outer shell 1a formed by joining an outer box 2 which is a bent product of a thin steel plate and an inner layer 31 of an inner box 30 which is a vacuum formed product of a resin sheet.
And a filler 11a, which is a heat insulating material having a cellular structure, such as foamed polyurethane filled into the voids inside the outer shell 1a. In addition, an outer layer 32 made of a molded product different from the inner layer 31 having a function of holding components such as a shelf receiver and an anchor member is provided independently inside the inner layer 31. An air passage for circulating the cool air from the cooler is formed between them. Further, a drain pipe for drain water, electric wires for operating a motor, a heater, and the like, and a refrigerant pipe (not shown) for supplying the refrigerant are filled with the filler 11a.
It is buried through.

[0003] However, in refrigerators and the like, which are required to reduce power consumption without using substances causing ozone layer depletion, since the heat insulating performance of the filler 11a, which is a heat insulating material such as urethane foam, is limited, it is difficult to reduce the power consumption. There has been proposed a technique using a vacuum heat insulating panel having a heat insulating performance twice or more that of the above.

As shown in FIG. 7, a vacuum insulation panel is formed by passing a porous core material 33 having continuous pores, which is an aggregate of foams or fibers or particles having open cells, into a bag-like shape and transmitting gas. Into the packaging material 34 in which the
The inside 4 is evacuated to a high vacuum state, and the end side 35 is heat-sealed to prevent outside air from entering.

In the above-mentioned vacuum insulation panel, it is essential that the core material 33 receives a compressive stress caused by the atmospheric pressure generated as a pressure difference between the inside and outside of the packaging material 34 and maintains its shape without causing deformation. In addition to materials, for example,
Japanese Patent Application Laid-Open No. Sho 60-205164 proposes using a molded product obtained by cutting urethane foam having communicating bubbles into a plate shape as a core material.

Furthermore, the excellent heat insulating performance of the vacuum heat insulating panel is attributed to the elimination of the heat transfer element that transmits the gas inside the pores among the heat component that transmits the gas contained in the porous body and the resin that forms the pores. At the same time, the heat transfer component due to radiation is greatly attenuated due to the increase in the number of partition walls constituting the cell accompanying the formation of fine pores.

In the heat insulating structure using such a vacuum heat insulating panel, after a vacuum heat insulating panel is disposed on one of the inner walls of an outer shell 1a forming a heat insulating wall, the remaining voids are filled with urethane foam. And then fixed.

However, according to the heat insulating structure to which the vacuum heat insulating panel is applied, not all of the heat insulating performance of the vacuum heat insulating panel is reflected due to the influence of the thermal cross-linking that runs around the surface of the packaging material 34. . Further, when the degree of vacuum is reduced due to the presence of minute defects in the packaging material 34 of the vacuum heat insulating panel and the desired heat insulating performance cannot be obtained, there is a problem that the entire system must be discarded.

[0009] Therefore, as a method of restoring the above-mentioned decrease in the degree of vacuum, for example, as disclosed in Japanese Patent Application Laid-Open No. 19580/1990, a filler having open cells in the outer shell of a heat insulating structure is used. There has been proposed a heat insulating structure in which a gas in the heat insulating wall is exhausted after filling to maintain a vacuum state (hereinafter, the heat insulating structure of the structure is referred to as a full vacuum heat insulating structure). According to this method, since the entire inside of the heat insulating wall is kept in a vacuum, the influence of thermal crosslinking is reduced, and even if a defect such as a pinhole penetrating the inside and outside of the outer shell such as a pinhole occurs in the outer shell. If the defective portion is covered with a tape made of an adhesive or a metal foil that suppresses the transmission of gas in the atmosphere, and then evacuated again, it can be reused.

[0010]

However, according to the full-vacuum heat-insulating structure constructed as described above, since the single-layer outer shell is provided to maintain the vacuum inside the heat-insulating wall, the inside of the outer shell is filled. It is important that the filler abuts along the shape of the outer shell without forming a gap, in order to maintain the appearance design. For example, as in the method for manufacturing a full vacuum heat insulating structure disclosed in Japanese Patent Application No. 10-207647, the outer shell surface is formed inside the outer shell, which has a complicated shape with conspicuous irregularities such as ducts and shelf supports. It is extremely difficult to insert the filler without providing a gap between them. If there is a gap, the outer shell deforms to fill the gap as the inside of the outer shell is evacuated, and the molded surface shape cannot be maintained.
This hinders fitting and holding with other parts and impairs the function of the related parts.

When a fixing means using an embedded part such as a screw or an anchor is employed in order to obtain a flexible shape for fitting and holding with other parts, gas permeation from the penetrating part to the inside of the outer shell is achieved. It is necessary to completely seal by using a sealing material in which the pressure is reduced or to weld the outer shell of the metal to secure a long-term vacuum holding. For that purpose, an extremely skilled technique is required. If the operation related to sealing is incomplete, gas in the atmosphere will enter the outer shell and the degree of vacuum will be reduced, resulting in a significant decrease in heat insulation performance.

Therefore, the all-vacuum heat-insulating structure has an outer shell structure in which the uneven surface is eliminated to prevent the occurrence of voids, and employs a fixing means using an embedded component or the like to prevent the invasion of the outside air. It was necessary to eliminate the outer shell structure having the penetration.

Further, instead of a resin molded product in which the degree of vacuum inside the outer shell is promoted by gas permeation is promoted, there is a method of forming by deep drawing of a metal such as stainless steel, but it is difficult to obtain a complicated shape. Therefore, it is necessary to devise a method for attaching another component such as a shelf support, which causes a problem that the number of parts and the number of steps of the box body increase.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a concave-convex surface so that a penetrating part can be attached, and the degree of vacuum inside the outer shell is hardly reduced.
An object of the present invention is to obtain a structural member of a heat insulating structure capable of suppressing the intrusion of gas in the atmosphere and maintaining heat insulating performance, a method of manufacturing the same, and a refrigerator using the structural member.

[0015]

According to the present invention, there is provided a heat insulating structure provided with a filler having a bubble structure inside an outer shell, wherein a hollow portion is formed by closely contacting the peripheral edges of two or more sheets. A part of the outer shell is constituted by the formed molded article. In addition, the surface in contact with the filler having the cell structure has a planar shape.

Further, the surface in contact with the filler having a cell structure is formed of a layer which is in close contact with the sheet surface and suppresses gas permeation. Further, it is made of a resin molded product in which a cavity is formed by holding air blown into a parison formed by passing through a deformed die.

Further, the method for manufacturing a structural member according to the present invention includes a step of forming a hollow portion by bringing a part of a plastic molding intermediate in a softened state into close contact, and a step of forming a layer for suppressing gas permeation. It is provided with. Further, the formation of the hollow portion is carried out by holding the air blown in the parison formed by passing through the deformed die and holding the molding intermediate in the mold to give a shape while closely adhering thereto. . Further, a layer for suppressing gas permeation is formed by attaching a metal foil to the surface of a molded product.

Further, the refrigerator according to the present invention is a heat insulating structure provided with a filler having a bubble structure inside an outer shell, comprising a structural member having two or more layers having a hollow portion,
The layer that does not contact the filler is used for mounting and penetrating parts,
The cavity between the layers is provided for a cool air circulation air passage and drain drainage.

[0019]

[First Embodiment] FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, showing a full vacuum heat insulating structure of a heat insulating box such as a refrigerator. Reference numeral 1 denotes an outer shell of the full-vacuum heat-insulating structure, which is constituted by an outer box 2 and an inner box 3, and has a void 1 surrounded by the outer box 2 and a continuous pore.
1 is filled, and the inside of the void portion including the pores of the filler 11 is kept at a vacuum.

The outer box 2 is made of a plate-shaped metal which is a member having high rigidity, in order to secure the design and strength of the heat-insulating box body and to prevent the invasion of the outside air and to suppress a decrease in the degree of vacuum in the gap. Formed using, painted steel plate excellent in design, ceiling, floor, each part of both sides are integrated and molded into a box shape with open front and back, to the members constituting the outer shell exterior surface of the refrigerator, It is constituted by closing the back opening by a back plate 6 made of a flat coated steel plate.

The inner box 3 is made of a resin having excellent moldability, for example,
It is formed using polypropylene, ABS resin, or the like, and is formed into a box-like structure having a double structure including an inner layer 3a and an outer layer 3b, and a cavity for forming a cool air circulation air passage 7 is provided between the inner layer 3a and the outer layer 3b. In addition, the outer layer 3b is provided with a concave / convex portion constituting a food storage shelf, shelf support, or the like, and constitutes an outer shell interior surface of the refrigerator. Inner layer 3a of inner box 3
Has a simple flat plate shape without a concave portion such as an undercut shape, and when this surface comes into contact with a filler 11 (described later) in the gap, the inside of the gap is in a vacuum state. Even in this case, the design can be maintained without deforming the appearance.

Reference numeral 8 denotes a gas permeation suppression layer formed of a metal foil such as aluminum, which is provided on the gap side of the inner layer 3a of the inner box 3. Inner layer 3 made of resin material to be lowered
a to maintain the degree of vacuum in the gap of the outer shell 1. If the inner layer 3a has a structure in which irregularities are formed, the gas permeation suppressing layer 8 may be provided after another filler is loaded in the irregularities, or the part may have a small area. For example, it may be provided only on the plane portion.

The thickness of the aluminum foil forming the gas permeation suppression layer 8 may be as thin as about 50 μm, for example, provided with an adhesive. Are held together to ensure an integrated state. If the thickness of the aluminum foil is 20 μm or less, it contains many defective portions such as pinholes, and is liable to be damaged such as breakage when pasting. If the thickness is 200 μm or more, the heat from the flange portion which comes into contact with the refrigerator door is generated. A thickness of 20 μm to 200 μm is preferable because it promotes the penetration and lowers the heat insulation performance.
A thickness of 0 μm to 80 μm is more preferred.

It is preferable that the entire inner layer 3a is covered with one piece of aluminum foil. However, since excessive wrinkling may occur in the processing of a corner or the like, a curved surface is formed by bonding a plurality of sheets. In this case, the overlapping portion is set to 10 mm or more, preferably 30 mm or more. Note that the gas permeation suppression layer 8 may be formed by vapor deposition of aluminum or silicon instead of aluminum foil.

On the other hand, the outer layer 3b is located outside the inner box 2 having a double structure to form an inner wall surface of the refrigerator, and to form a mounting portion for a component such as a shelf receiver required for the refrigerator. A cold air circulation air passage 7 is formed integrally with the inner box 3a. For this reason, as in the heat insulating structure of the conventional refrigerator shown in FIG. There is no need to attach and configure a cool air circulation path, and the number of parts and man-hours are reduced. Reference numerals 9 and 10 denote cooling air circulation fans and coolers mounted on the inner layer 3a of the inner box 3 on the side of the cooling air circulation path 7 using screws or the like.

Reference numeral 11 denotes a filler made of a foamed resin having continuous pores such as a polyurethane foam, which is inserted into the gap of the outer shell 2 without any gap, and which has an inner layer 3a of the inner box 3 and an outer layer 2a.
To prevent the outer shell 2 from being deformed. Reference numeral 12 denotes a gas adsorbent embedded at an arbitrary position in the plane portion of the filler 11, and the degree of vacuum inside the outer shell 1 is changed with time by a gas permeated from a joint portion between the outer box 2 and the inner box 3 or a surface of the inner box 3. It is provided to prevent the gas permeation suppression layer 8 from being reduced and to reduce the amount of use of the gas permeation suppression layer 8, and adsorbs gas that has entered from the junction between the outer box 2 and the inner box 3 little by little. Maintain a high degree of vacuum and permanently secure insulation performance.

Next, a method of manufacturing the full vacuum heat insulating structure of the refrigerator configured as described above will be described with reference to the flowchart of FIG. First, using polypropylene,
Form a box-shaped structural member with a double structure by blow molding,
The inner layer 3 is obtained by providing the outer layer 3b with irregularities or the like forming a shelf support and the like, and forming a cavity forming the cool air circulation air passage 7 between the inner layer 3a and the outer layer 3b. Next, the coated steel plate is bent to form a box-shaped bent product in which the ceiling, floor, and both sides are integrated, and the inner box 3 is placed in the outer box 2 having the back opening opened. Is inserted, joined and sealed to form a first outer shell (step S-1).

As shown in FIG. 3 (enlarged view of a portion A in FIG. 1), the joining and sealing work of the outer box 2 and the inner box 3 are performed in a substantially U-shaped manner inside the end surface 13 of the outer box 2. The groove 14 is formed, an adhesive 15 such as an epoxy resin is filled in the groove 14, and the end 16 of the inner box 3 is inserted into the groove 14. At this time, it is preferable to use an adhesive containing an inorganic substance so that air or moisture does not permeate and migrate into the outer box 2.

Next, a filler 11 to be inserted into the space of the outer shell 1 is prepared. This filler 11 is equivalent to the atmospheric pressure (0.1
MP) or higher, and is formed by foaming a foamed resin having open cells such as urethane foam to form a large slab-like foamed product, and cutting out the foamed product into a flat plate shape. Since the surface shape of the outer shell 1 on the side of the gap is a simple flat plate, the shape of the filler 11 inserted into the gap may be a combination of simple plate-like processed products. Since the filler 11 is cut straight from slab-like urethane foam using a sawing machine or the like, processing is easy.

In this manner, the filler 11 constituting each part of the heat insulating wall is obtained, and the gas adsorbent 12 is embedded in an arbitrary portion of the filler 11, and then the filler 11 is transferred to the outer shell 2.
From the back opening of the above (step S-
2). This insertion work is performed by the inner layer 3a of the inner box 3 and the filler 11
This can be easily performed without generating a gap between them, and the number of steps can be reduced. At this time, since the gas permeation suppression layer 8 is attached in close contact with the surface of the inner layer 3a of the inner box 3 on the side of the gap, it is possible to ensure that both materials are held together and integrated, and the filler 11 When inserting
There is no displacement or peeling.

After the filler 11 is inserted into the gap from the back opening of the outer box 2 as described above, the back opening of the outer box 2 is closed with the back plate 6, and the joint portion with the outer box 2 is removed. The outer shell 1 is joined and sealed with an adhesive to form a completely closed outer shell 1 (step S-3). The outer box 2 and the back plate 6 may be joined by welding or brazing.

Next, a vacuum is drawn through a vacuum valve (not shown) mounted in the machine room (step S-).
4) Exhaust gas such as air remaining in the gap of the outer shell 1. In addition, since the vacuum valve is mounted in the machine room portion, the vacuum valve can be arranged so as to maintain a sealed state after evacuating and not to impair the design. Instead of the vacuum valve, a sealing valve such as a check valve may be used.

The degree of vacuum in the space of the outer shell 1 due to the evacuation varies depending on the type of the structural material used, but is 10 ⁻⁰ torr.
As described above, preferably by securing about 10 ^-2 torr, sufficient heat insulating performance can be exhibited. In this way, when the inside of the space of the outer shell 1 is evacuated, the filler 11
Is filled in the gap without any gap, so the outer shell 2
And the filler 11 are completely adhered to each other to secure the strength of the heat insulating box body, and the filler 11 has a compressive strength equal to or higher than the atmospheric pressure (0.1MP) to prevent deformation of the outer shell 1 and the like that occur thereafter. Therefore, it is possible to prevent the problem from occurring beforehand, and it is possible to prevent the dimensions of the required portion of the inner box 3 from changing due to the atmospheric pressure, and to prevent the outer box 2 from having irregularities, thereby deteriorating the design.

In order to ensure a sufficient vacuum state inside the continuous pores of the filler 11, the filler 11, which is a cut-out molded product, is placed in the longitudinal direction from the mounting portion of the vacuum valve or its vicinity. The groove or hole extending to the hole may be processed in advance. In this case, the gas in the pores of the filler 11 is easily discharged along the grooves or holes, and the evacuation time can be greatly reduced. If the groove is wide, the groove is easily deformed by the atmosphere. Therefore, it is preferable to use many deep grooves that do not hinder the handling of the filler 11. For example, the width is 3 mm and the depth is 5 mm.
May be formed at a pitch of 50 mm.

After evacuating as described above,
Parts such as a cool air circulation fan 9 and a cooler 10 are attached to the outer layer 3b of the inner box 3 using screws or the like. in this case,
Since the outer layer 3b is located outside the double structure separated from the inner layer 3a and does not contribute to maintaining the vacuum state of the heat insulating wall,
Even if the fan 9 or the like is attached, the degree of vacuum of the heat insulating wall is not reduced. Further, the outer layer 3b may be provided with irregularities of an arbitrary shape, for example, to attach components necessary for the refrigerator, such as shelf supports.

Next, a method for manufacturing the inner layer 3 as a structural member in the embodiment will be described with reference to the explanatory view of FIG. 4 and the flowchart of FIG. In FIG.
Is a deformed die of a structural member manufacturing apparatus, and 18 is a parison. Reference numeral 19 denotes an inner-layer mold for molding the inner layer 3a of the inner box 3 for maintaining the degree of vacuum, and reference numeral 20 denotes an outer-layer mold for molding the outer layer 3b of the inner box 3 corresponding to the interior surface of the refrigerator. The surface of the mold 19 is formed in a flat shape, and the outer layer side mold 20 is provided with a shape such as a shelf support, and the shelf support or the like is attached to the inner box 3 using a separate component as in a conventional heat insulating structure. There is no need to simplify the manufacturing process.

In order to manufacture the inner box 3, first, a metal foil is set in the inner layer mold 19 on the side where the inner layer 3a is formed, and the outer layer mold 20 on the side where the outer layer 3b is formed is required. In accordance with the above, the mounting part 21 for fixing the internal components of the refrigerator is set and fixed to the structural member by the insert (Step-11). Next, blow molding is performed while holding the blown air in the parison 18 formed by passing through the deformed die 17, sandwiching the two molds 19 and 20 to give a shape, and forming a double A structure is formed (Step S-12).

The method of forming the structural member shown in step S-12 will be described in more detail. The molten resin polypropylene is extruded by an extruder into a cylindrical bag-like sheet whose tip is sealed off, and this is extruded into both molds 1.
Insert between 9, 20. At this time, since the polypropylene forms a cylinder, the air blown into the cylinder of the sheet is supplied by the inner layer mold 19 on the side forming the inner layer 3b of the inner box 3 and the outer layer mold on the side forming the outer layer 3b. It is held as it is between the molds 20. In this manner, the mating surfaces of the two dies 19 and 20 are formed into a plate shape in which the edges of the sheet are welded and integrated.
Further, the sheet is also welded to form a plate-shaped molded product in which the inner mold 19 and the outer mold 20 are opposed to each other except for the thickness of the sheet.

However, in the portion where the two dies 19 and 20 are opposed to each other with a sufficient gap, the air blown into the interior remains as it is, so that the interior is finished in a hollow state. In this way, the inner box 3, which is a structural member, is formed, including a hollow portion corresponding to an arbitrary shape provided in the outer layer side mold 20 in particular.

Next, the molded product is cooled while keeping the molds 19 and 20 hermetically closed until the molded polypropylene has a heat deformation temperature, preferably a glass transition temperature or lower, and then is taken out. . The temperature at this time is 8
0 ° C. or lower is preferable, and 50 ° C. or lower is particularly preferable.

Next, an unnecessary part of the molded product obtained as described above is trimmed to obtain an inner box 3 having a desired shape (step S-13). It is important that this trimming be limited to the outer layer 3b of the inner box 3, and the inner layer 3a except for the outer peripheral edge of the molded product comes into contact with the filler 11 of the full vacuum heat insulating structure and the inner layer 3a. In order to maintain the degree of vacuum, it is necessary to avoid damage to the flat surface.

Next, components such as a fan 9 for circulating cool air are attached to the outer layer 3b of the inner box 3 obtained in step S-13 (step S-14). In step S-12, the gas permeation suppression layer 8 is integrally formed by disposing the gas permeation suppression layer 8 in a mold, or in step S-14, a gas permeation suppression layer such as a metal foil is attached or a metal is deposited. 8 is formed.

As is apparent from the above description, according to the present embodiment, since the structural members of the all-vacuum heat-insulating structure are formed as a two-layer structure having a hollow portion, a complicated shelf shape and the like can be formed. The components can be easily attached, and the air path and the like can be integrally formed. Further, the surface provided for vacuum holding can have a flat contact surface shape in which a gap with the filler 11 is hardly generated, so that the processing and insertion of the filler 11 are facilitated, and a metal layer is provided on the contact surface side. To ensure gas barrier properties. Thus, the number of components can be reduced, the weight can be reduced, and the heat bridge effect of the structural member can be suppressed.

Further, since this structural member can be easily molded by blow molding of plastic,
When the structural member is used in a refrigerator or the like, a part and a part for attaching a part, a part such as an air path, a layer for suppressing gas from entering the inside of the outer shell 1 and the like can be integrally formed, and the number of parts can be reduced, and the process can be reduced. Can be simplified.

The present invention is not limited to the inner box and the outer box used for the full vacuum insulation structure of the refrigerator described in the embodiment described above and shown in the drawings. The present invention can be applied in various forms, and can be variously modified without departing from the gist thereof, such as a heat-insulating panel used for a prefabricated refrigerator or a refrigerator vehicle.

[0046]

As is apparent from the above description, the structural member of the present invention is a heat insulating structure provided with a filler having a bubble structure inside an outer shell, in which the peripheral edges of two or more sheets are brought into close contact. Since a part of the outer shell is formed by the molded product having the hollow portion formed therein, even if the component is attached with a screw, an anchor, or the like, gas intrusion is suppressed, and the heat insulating performance does not decrease. In addition, since the above-mentioned structural member has a flat surface in contact with the filler having a bubble structure, it is easy to insert and adhere to the filler, and a metal foil such as an aluminum foil that does not transmit gas is used. The layers can be easily applied.

Further, since the above-mentioned constituent member is formed of a layer in which the surface in contact with the filler having a cellular structure is in close contact with the sheet surface and suppresses gas permeation, it is possible to suppress a decrease in heat insulation performance, Deformation of the structure can be suppressed. In addition, since the above-mentioned structural member is formed of a resin molded product having a cavity formed by holding air blown in a parison formed by passing through a deformed die, it is possible to perform screwing, and It is also easy to provide a receiver.

Further, the method for producing a structural member of the present invention
Since it has a step of forming a hollow part by closely adhering a part of the plastic molding intermediate in a softened state, and a step of forming a layer that suppresses gas permeation, when used for the outer shell of a heat insulating box, A practical structure can be formed, such as by providing a through hole with the outer shell at the part where the parts are mounted, and since the intrusion of gas in the atmosphere into the outer shell can be suppressed, such as refrigerators that have reduced heat insulation performance are reduced. A heat insulating structure can be formed.

Further, the above-mentioned hollow portion is formed by holding the air blown in the parison formed by passing through the deformed die, holding the molding intermediate in a mold, and giving a shape while closely adhering to the mold. Since the process is performed, a hollow portion can be easily formed by providing a member having a simple structure at a necessary portion, and the device can be efficiently and easily manufactured. Furthermore, since the layer that suppresses the permeation of the gas is formed by attaching a metal foil to the surface of the molded product, gas intrusion into voids in the outer shell is suppressed, and excellent heat insulation performance is maintained. .

Further, the refrigerator of the present invention is a heat insulating structure provided with a filler having an air bubble structure inside the outer shell, comprising a structural member having two or more layers having a hollow portion, and having the same structure as the filler. The non-contact layer is used for mounting and penetration of parts, and the cavity between the layers is used for cooling air circulation and drain drainage, enabling efficient installation of members and reducing the number of parts can do.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a flowchart showing a manufacturing method of FIG.

FIG. 3 is an explanatory view showing a connecting means of the outer box and the inner box of FIG. 1;

FIG. 4 is an explanatory view showing a method of manufacturing a main part of FIG. 1;

FIG. 5 is a flowchart illustrating a manufacturing method of FIG. 4;

FIG. 6 is a longitudinal sectional view showing an example of a conventional heat insulating structure.

FIG. 7 is a sectional view showing an example of a conventional vacuum heat insulating panel.

[Explanation of symbols]

1 outer shell, 2 outer box, 3 inner box (structural member), 3a inner layer, 3b outer layer, 7 cold air circulation air passage, 8 gas permeation suppression layer, 11 filler, 17 deformed die, 18 parison,
19,20 Mold.

Claims (8)

[Claims] 1. A heat-insulating structure provided with a filler having a cellular structure inside an outer shell, wherein a part of the outer shell is formed by a molded article having a hollow portion formed by closely contacting peripheral edges of two or more sheets. A structural member comprising: 2. The structural member according to claim 1, wherein the surface in contact with the filler having a cellular structure has a planar shape. 3. The structural member according to claim 1, wherein the surface in contact with the filler having a cellular structure is formed of a layer that is in close contact with the sheet surface and suppresses gas permeation. 4. A resin molded product according to claim 1, wherein said resin molded product has a cavity formed by holding air blown into a parison formed by passing through a deformed die. Structural members. 5. A structural member comprising: a step of forming a hollow portion by closely adhering a part of a plastic molding intermediate in a softened state; and a step of forming a layer for suppressing gas permeation. Production method. 6. The formation of the hollow portion is performed by holding the air blown in the parison formed by passing through the deformed die and holding the molding intermediate in a mold to give a shape while closely adhering thereto. The method for manufacturing a structural member according to claim 5, wherein: 7. The method for manufacturing a structural member according to claim 5, wherein the layer for suppressing gas permeation is formed by attaching a metal foil to a surface of a molded product. 8. A heat insulating structure provided with a filler having a cellular structure inside an outer shell, comprising a structural member having two or more layers having a hollow portion, wherein a layer not in contact with the filler is a component. The refrigerator according to claim 1, wherein a hollow portion between the layers is provided for a cool air circulating air passage and drain drainage.