KR20140120252A - Icebox using flexible vacuum insulation panel and method for manufacturing thereof - Google Patents

Abstract

The present invention relates to an icebox using a curved vacuum insulation panel and a method of manufacturing the icebox. The icebox using a curved vacuum insulation panel comprises: an inner case which is composed of a bottom portion and a plurality of side portions, wherein a storage space is formed in the inner case and an upper surface of the inner case is opened; an outer case which encloses outside the bottom portion and side portions of the inner case to form a displacement spacing between the inner and outer cases; a curved vacuum insulation panel which is bent to be installed along two facing side portions of the inner case and an outer side surface of the bottom portion, within the displacement spacing; plate-type vacuum insulation panels which are arranged on outer side surfaces of the two facing side portions of the inner case, respectively; and an auxiliary insulation panel which fills the displacement spacing between the inner and outer cases. According to the present invention, heat reserving and cold reserving effects are improved by enhancing a heat insulation property of the icebox.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an ice box using a bending type vacuum insulator,

The present invention relates to an ice box using a bending vacuum insulation material and a manufacturing method thereof, and more particularly, to an ice box using a bending vacuum insulation material, which not only provides an excellent insulation and cooling effect by improving the heat insulation performance, The present invention relates to an ice box using a vacuum insulating material and a manufacturing method thereof.

In general, a portable ice box is a portable cold storage and thermal insulation device that intercepts heat exchange with the outside through a heat-insulating styrofoam so as to keep foods contained therein intact. When ice or dry ice is filled in the ice box The inside thereof is maintained at a low temperature state.

A typical ice box is composed of a main body having a predetermined volume and a lid capable of covering the main body. In the case of a general household ice box, the main body has the same structure as the main body having the styrofoam interposed between the inner and outer boxes made of synthetic resin. The Lord consists of a cover.

The general household ice box has the advantage of being able to secure a certain degree of durability by the inner and outer box made of synthetic resin, and it is possible to use it in multiple ways and its size can be variously manufactured. However, there are many processes for manufacturing it, In order to accurately fit the space, it is necessary to form the styrofoam with exact dimensions. Therefore, it is difficult to handle the styrofoam with low durability. As a result, workability and productivity have been reduced as a whole. In order to provide an effective accommodating volume for the external volume Styrofoam, which is a substantial heat insulating member, has a disadvantage in that it is inferior in heat insulating property because it has a thin thickness.

In order to improve the heat insulation performance of such an ice box, researches have been conducted to apply a vacuum insulation material having excellent heat insulation performance.

Japanese Patent No. 4944567 discloses that a heat transfer phenomenon occurs at the end of the vacuum insulation material in the case of the plate-like vacuum insulation material applied to the box shape.

These "thermal bridges" mean the same thing as cold bridges, meaning that some of the walls are thinner in structure, or that the materials tend to condense when other parts of the heat flow resistance are small. When five plate-shaped vacuum heat insulating materials are attached to five sides of the ice box made up of the bottom surface and the four side surfaces, portions having small heat flow resistance are generated at the respective corners and heat loss to the outside is generated.

Therefore, in order to solve the problem of leakage of heat from the corner portion, a vacuum insulating material is disclosed so that a hexahedron can be assembled by applying a gas barrier film having a shape in which a hexahedron is developed on a plane. However, the vacuum insulation material has a disadvantage in that it is not easy to manufacture and the productivity is low.

Japanese Patent No. 4778856 discloses a transporting ice box in which a vacuum insulating material is installed. The ice box has a structure in which a vacuum insulating material is disposed between an inner box and a jacket. The ice box includes a bottom surface, There is provided an ice box in which a component of the ice box structure is removable by using a foamed polystyrene having a vacuum insulator and a protective member which are folded over two or more sides and formed on the inner box in the inner box. However, the ice box has a disadvantage that it is difficult to move because of its large volume and heavy weight.

Japanese Patent Registration No. 4520950 discloses an ice box in which a heat insulating material including a vacuum insulating material is provided between an inner case and an outer case, the vacuum insulating material having an inner surface and an outer surface, And a vacuum insulator which is integrally connected to at least two of the bottom surface and the plurality of side surfaces and which is bent by using a bent portion is applied to the vacuum insulator, In which the above-described technique is applied.

However, the demand for lightweight and durable ice boxes continues to increase, while providing improved insulation performance for use in leisure activities such as camping and fishing, and for maintaining temperature sensitive items for extended periods of time.

Prior Art Document 1. Japanese Patent No. 4944567 (2008.05.08) Prior Art Document 2. Japanese Patent No. 4778856 (Feb. 14, 2008) Prior Art Document 3. Japanese Patent No. 4520950 (Aug. 2007)

Accordingly, the present inventors have found that, in an ice box having a lid part that can be opened and closed and includes a vacuum insulating material between an inner case and an outer case, the ice box is installed on the bottom and four side parts along the inside of the outer or outer case of the inner case, An ice box including at least three surfaces of a bottom surface portion and a side surface portion integrally connected to each other and an auxiliary insulating material for improving the airtightness and heat insulating performance between the vacuum insulating material curved along the edge and the outer case of the inner case, The present invention has been accomplished based on the finding that the use of the internal space is remarkably improved while the thickness of the light box is reduced and the thickness of the conventional ice box is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ice box using a bending-type vacuum insulation material capable of improving insulation performance and providing excellent insulation and cooling effect.

In addition, it can be used for leisure activities such as camping and fishing, while providing improved insulation performance to maintain temperature-sensitive items for a long time, it is possible to increase the internal volume by making the thickness thinner, And to provide an ice box using a bendable vacuum insulation material that is easy to handle.

Another object of the present invention is to provide a method of manufacturing an ice box using a bending type vacuum insulation material capable of effectively filling an auxiliary insulating material in a space between an inner case and an outer case.

According to an aspect of the present invention, there is provided an air conditioner comprising: an inner case formed with a bottom portion and a plurality of side portions and having a receiving space formed therein and having an upper surface opened; A bending type vacuum insulation material bending along the outer side surfaces of the two side surfaces and the bottom surface of the inner case facing each other in the spaced space; A flat plate type vacuum insulator disposed on outer side surfaces of two side portions facing each other; And an auxiliary heat insulating material filled in the space between the inner case and the outer case. The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

Here, an adhesive member for fixing the bending type vacuum insulator to the inner case is disposed at the edge of the surface of the bending type vacuum insulator facing the inner case.

It is preferable that a transparent window is formed on at least one of the bottom surface portion and the plurality of side surface portions of the inner case so that the bending vacuum insulation material or a part of the flat plate type vacuum insulation material is observed.

It is also preferable that the auxiliary insulating material is foamed polyurethane.

The thickness of each of the bending type vacuum insulation panel and the flat panel type vacuum insulation panel is preferably 10 to 50% of the spacing of the spacing spaces.

The thickness ratio of any one of the bending vacuum insulation material and the flat plate-type vacuum insulation material to the auxiliary insulation material is preferably 1: 9 to 5: 5.

Preferably, the vacuum cleaner further includes a lid part having a vacuum insulator disposed therein to open and close the receiving space of the inner case.

In addition, each of the bending-type vacuum insulation panel and the flat panel-type vacuum insulation panel preferably includes a core made of synthetic silica and organic fibers.

The synthetic silica preferably has a BET specific surface area of 40 to 400 m 2 / g and an average particle size of 5 to 50 nm.

It is preferable that the organic fibers have a diameter of 1 to 100 탆 and a length of 6 to 40 mm.

The bending type vacuum insulator and the flat plate type vacuum insulator may include a heat shrinkable film that wraps six surfaces of the core material; And a packaging material for vacuum packing the core material wrapped with the heat shrinkable film.

The content of the organic fibers in the core material is preferably 0.5 to 10 parts by weight based on 100 parts by weight of the core material of the vacuum insulation material.

A further object of the present invention is to provide

A step of disposing an adhesive member on the edge of the surface of the bending type vacuum insulator and the face of the flat plate type vacuum insulator opposite to the inner case; bending the bending type vacuum insulator so that at least three out of the bottom face portion and the outer side face of the side face portion A step of installing a flat plate type vacuum insulation material on the outer surface of the outer surface of the bottom surface portion and the side surface portion of the inner case where the bending type vacuum insulation material is not disposed, Supplying the foamed polyurethane into the inside of the inner case; combining the inner case and the outer case; And expanding and curing the foamed polyurethane to form an auxiliary insulating material in a spaced-apart space between the inner case and the outer case.

INDUSTRIAL APPLICABILITY According to the present invention, there is provided an ice box using a bending type vacuum insulator capable of improving the heat insulating performance and providing an excellent warming and cooling effect.

In addition, it can be used for leisure activities such as camping and fishing, while providing improved insulation performance to maintain temperature-sensitive items for a long time, it is possible to increase the internal volume by making the thickness thinner, There is provided an ice box using a bending vacuum insulation material that is easy to carry and handle.

There is also provided a method of manufacturing an ice box using a bending-type vacuum insulating material capable of effectively filling an auxiliary insulating material in a space between the inner case and the outer case.

1 is a perspective view of an ice box using a bending type vacuum insulator according to the present invention,
2 is an exploded perspective view of an ice box using a bending type vacuum insulator according to the present invention,
FIG. 3 is a bottom perspective view showing a state in which an inner case and a vacuum insulating material are separated from each other in an ice box using the bending type vacuum insulation material of the present invention,
4 is a sectional view of an ice box using a bending type vacuum insulator according to the present invention,
FIG. 5 is a bottom perspective view showing a state in which an inner case and a vacuum insulating material are combined according to an ice box using the bending type vacuum insulation material of the present invention,
6 and 7 are graphs showing the results of testing the heat insulation performance of the ice box using the conventional ice box and the bending type vacuum insulation material of the present invention in a constant temperature and humidity chamber,
8 is a graph showing a result of testing the heat insulation performance of a conventional ice box and an ice box using a curved vacuum insulation material according to the present invention,
FIG. 9 is a perspective view showing an inner case of an ice box using a bending type vacuum insulator according to a modification of the present invention. FIG.
10 is a cross-sectional view of an ice box using a bending type vacuum insulator according to a modification of the present invention,
11 is a process flow chart of a method of manufacturing an ice box using a bending type vacuum insulator according to the present invention,
FIGS. 13 to 15 are views showing steps of each process according to the method of manufacturing an ice box using the bending type vacuum insulator of the present invention.

Prior to the description, components having the same configuration are denoted by the same reference numerals as those in the first embodiment. In other embodiments, configurations different from those of the first embodiment will be described do.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an ice box using a bending type vacuum insulator according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of an ice box using a bending type vacuum insulator according to the present invention, FIG. 2 is an exploded perspective view of an ice box using a bending type vacuum insulator according to the present invention, and FIG. Is a bottom perspective view showing a state in which the inner case 110 and the vacuum heat insulating material 130 are separated from each other.

1 to 3, the ice box using the bending type vacuum insulator according to the embodiment of the present invention improves the heat insulation performance, thereby providing excellent insulation and cooling effects, and is lightweight and easy to carry and handle And includes an inner case 110, an outer case 120, a vacuum insulating material 130, an auxiliary insulating material 140, and a lid 150.

The inner case 110 has a rectangular bottom portion 111 and four side portions 112 extending from respective sides of the bottom portion 111 and having side walls so as to have the shape of a container having the receiving space 115 And a flange 113 is formed on the upper outer circumferential surface of the side part 112 to close the spacing space 123 provided between the upper part and the outer case 120.

The outer case 120 is formed in the form of a container composed of a bottom surface 121 and four side surfaces 122. The outer case 120 surrounds the outer surface of the inner case 110, And the upper end of the side portion 122 is engaged with the flange 113 of the inner case 110. [

The vacuum insulator 130 is configured to be bent by a physical external pressure so that the vacuum insulator 130 can be continuously attached along the outer surface of the inner case 110.

That is, the vacuum insulator 130 of this embodiment is characterized by using organic fibers. The reinforcing fibers for vacuum insulation used up to now include inorganic fibers such as glass fiber and ceramic fiber. Although the two inorganic fibers are mixed with each other as they are made of silica and similar to the main material of the internal core material, the reinforcing effect of the mechanical strength is not great when the two fibers are mixed, and the specific gravity is as high as the glass fiber of 2.5 and the ceramic fiber of 3.0, There is a high disadvantage.

Therefore, the vacuum insulation material 130 of the present embodiment introduces organic fibers as reinforcing fibers to improve the disadvantages of the vacuum insulation material using inorganic fibers as reinforcing fibers. Glass fiber and ceramic fiber are used as inorganic fiber for reinforcement fiber which is used as an inner core of conventional vacuum insulation material. Inorganic fiber is mixed with synthetic silica because silica and alumina powder such as synthetic silica are mainly composed. It is known that the reinforcing effect is high by exhibiting the bonding force. On the other hand, organic fibers are considered to be easily separated because they have no bonding force at the time of compression, and the reinforcing effect is considered to be low. In addition, it is known that organic fibers generate gas in vacuum and increase the internal pressure of vacuum insulation. However, the inventors of the present invention have focused on organic fibers having a low specific gravity in order to improve the specific gravity of the inorganic fibers. In order to prevent the organic fibers and the synthetic silica from easily separating, To maximize the friction between organic fibers and synthetic silica.

As a result, it was found that the frictional force with the synthetic silica at the bent portion of the warped organic fibers efficiently acts to improve the mechanical strength of the inner core material, which is superior to the weak bonding effect of the inorganic fibers. Organic fiber has almost no binding effect with synthetic silica in the inner core of vacuum insulation. However, the frictional force between the fibers and the synthetic silica generated at the flexion of the fiber exerts a stronger reinforcing effect than the conventional fibers.

On the other hand, the above-mentioned effect can not be achieved by merely adding more fibers because the organic fibers have a smaller specific gravity than the inorganic fibers but have a larger diameter, and a method for maintaining a stable bonding state between synthetic silica and organic fibers It was possible to implement it. PP fiber has a specific gravity of 1/3 of glass fiber, but its diameter is 4 times, so the mixing amount in the same amount is less, and the tensile strength is only 1/3. However, the effect of reinforcing the flexural strength of synthetic silica on the length and mixing method was more than twice. This demonstrates the excellent reinforcing effect of PP fibers on internal core fibers.

The most important characteristic of organic fibers is that they are more flexible than inorganic fibers. It is possible to manufacture a vacuum insulation material which can be bent by physical external pressure when organic fibers having excellent extensibility as compared with inorganic fibers are mixed with silica as a main component of a heat insulating material in a predetermined length.

Particularly, the characteristic technical idea of the vacuum insulating material is that a powder mixture containing synthetic silica having an average particle size of 5 to 50 nm and organic fibers cut to 6 to 40 mm are contained in an amount of 0.5 to 10 wt. It was found that the blended fiber mixture was blended and then wrapped with a heat-shrinkable film to have a molding condition most easily bendable.

The vacuum insulator 130 is made of synthetic silica having a BET specific surface area of 40 to 400 m < 2 > / g and an average particle size of 5 to 50 nm according to a BET (Brunauer-Emmett-Teller) A heat shrinkable film of PE, LLDPE, PP, PVC or PET which wraps 6 faces of the core material, and a heat shrinkable film of a material such as PE, LLDPE, PP, PVC or PET which is wrapped with the heat shrinkable film And a packaging material such as nylon, PET, PP, or aluminum multilayer film for vacuum-packing the core material. The content of the organic fibers in the core material is 0.5 to 10 parts by weight based on 100 parts by weight of the core material of the vacuum insulation material 130.

The thickness of the vacuum insulator 130 is preferably 10 to 50% of the thickness ratio (D, see FIG. 4) of the spacing spaces 123 between the inner case 110 and the outer case 120, Is preferably 30 to 40% in thickness ratio.

The thickness ratio of the vacuum insulation material 130 to the auxiliary insulation material 140 is 1: 9 to 5 (m / s) because the auxiliary insulation material 140 is filled in the space other than the vacuum insulation material 130 in the spacing space 123. Therefore, : 5 thickness ratio.

When the thickness ratio of the vacuum insulation material 130 is 10% or less, the insulation effect by the vacuum insulation material 130 is remarkably deteriorated. When the thickness of the vacuum insulation material 130 is 50% or more, (The distance between the inner side surfaces of the foamed polyurethane 120) is reduced, the fluidity of the foamed polyurethane is lowered. That is, as the thickness of the vacuum insulator 130 is determined within the above range, the fluidity of the foamed polyurethane is ensured in the course of inflating the auxiliary insulating material 140 in the spacing space 123, (123).

According to the present invention, it is possible to exhibit a sufficient heat insulating effect even if it occupies about 10% to 50% of the spacing space 123 by the vacuum insulating material 130 having the above-mentioned characteristics included in the ice box. In addition, the vacuum insulation material 130 having the above-described characteristics can achieve almost the same insulation effect even if it is thinner than the conventional sheet-like vacuum insulation material which can not be bent. Therefore, the vacuum insulating material 130 can be easily inserted into the auxiliary insulating material 140 to maximize the heat insulating performance of the ice box.

In the synthetic silica, fumed silica produced by a gas phase reaction, precipitated silica produced by a liquid phase reaction, colloidal silica, aerogels, silica sol and the like can be used. Among them, the use of a fumed silica having a low production cost and a large specific surface area is preferable. The inner core of vacuum insulation can be manufactured by pure synthetic silica powder. In addition to synthetic silica, powders such as alumina, titanium oxide, silicon carbide and graphite can be mixed to improve the heat insulation. Preferably, the synthetic silica content of the powder mixture for internal core material accounts for 70% or more.

It is advisable to mix infrared opaque fire with synthetic silica to block radiant heat. The infrared opaque fire used for the inner core is titanium oxide, carbon black, talc, silicon carbide, iron oxide, zirconium oxide, and graphite. These opaque fires have the function of blocking fast heat transfer by radiation by reflecting or absorbing far infrared rays emitted from objects at 15 ~ 40 ℃. It is preferred that the opaque fire occupies 5 to 30 parts by weight per 100 parts by weight of the inner core material. The average particle size of the components forming the opaque fire is 1 to 90 μm or less, and the smaller the particle size, the better the effect.

The BET specific surface area of the synthetic silica is preferably 40 to 400 m 2 / g. When the specific surface area is less than 40 m < 2 > / g, the heat insulating property is deteriorated. When the specific surface area exceeds 400 m < 2 > / g, The average primary particle size of the synthetic silica is preferably 5 to 50 nm. When the primary particle size is less than 5 nm, the volume becomes large and difficult to handle. When the primary particle size is larger than 50 nm, a sufficient heat insulating effect can not be obtained in compression.

The diameter of the organic fibers is preferably 1 to 100 mu m, more preferably 10 to 40 mu m. Since the organic fibers are produced in a bundle, if it is smaller than 1 탆, it takes much time to disperse. If it is larger than 100 탆, the fibers do not bend well and the number of fibers is small. The length of the organic fibers is preferably 6 to 40 mm, and it is more preferable to use a certain length of organic fibers rather than using various lengths of organic fibers. If the length of the organic fiber is shorter than 6 mm, the fiber reinforcing effect is significantly lowered. If the length of the organic fiber is longer than 40 mm, partial clumping occurs and it is difficult to homogeneously mix with the powder.

Organic fibers having a true specific gravity of 1.4 or less such as PE, PP, Nylon, PVA, PAN, and PET can be used for the types of organic fibers used. For the fiber reinforcement of the inner core, it is preferable to use only the organic fibers, but it is also possible to mix the carbon fibers and glass fibers with the organic fibers at a high ratio. In this case also, the main reinforcing function is the organic fiber.

The content of the organic fiber mixture is preferably 0.5 to 10 parts by weight based on 100 parts by weight of the synthetic silica-containing powder mixture. If the organic fiber content becomes too high, the change of the vacuum insulator 130 with time is accelerated to deteriorate the heat insulating performance.

It is advisable to blend the powder mixture with the synthetic fiber and the fiber mixture including the organic fiber by homogeneously blending the powder mixture and the fiber mixture in a mixer at a predetermined blending ratio. Alternatively, it is possible to make a composite mixture of synthetic silica-containing powder mixture and organic fiber-containing fiber mixture by respective layers, but the improvement in mechanical strength to the amount of the same organic fiber is not better than that of the homogeneous mixture.

The manufacturing process of making the inner core of vacuum insulation with a mixture of synthetic silica-containing powder mixture and fiber containing organic fiber takes place in several stages. Here, various manufacturing processes are possible according to the arrangement order of each step. The result, however, has similar properties.

The easiest manufacturing process comprises separately drying the synthetic silica-containing powder mixture and the organic fiber-containing fiber mixture; Blending the dried powder mixture and the fiber mixture at a predetermined ratio; And compressing the combination.

Drying of the powder mixture containing synthetic silica is preferably carried out at a temperature of from 100 to 150 ° C under normal pressure for the purpose of evaporating water. Drying of the fiber mixture containing organic fibers differs depending on the heat-resistant temperature of the fibers. Nylon fiber has a heat-resisting temperature exceeding 1120 ° C, and it is preferable to dry at 100-140 ° C, but it is preferable to dry PP fiber having a low heat-resistant temperature at a lower pressure of 70-80 ° C. The organic fiber is preferably dried at a temperature 10 to 20 ° C lower than the softening temperature of the fiber. Mixing of synthetic fiber-containing powder mixture with organic fiber-containing fiber mixture can be carried out using a powder mixer such as a ribbon mixer, a stirrer, a Nauta mixer, and a blade mixer. Evenly mixed blends are compressed into presses, where the density of the inner core is controlled. The density of the inner core material is preferably compressed at a density of 0.12 to 0.35 g / cm3 as an important factor that greatly affects the mechanical strength and the thermal insulation of the finished product. The press can be made with both single acting press and roller press.

The vacuum insulation material of the present invention can use a heat shrinkable film or a film having moisture resistance to laminate the powder mixture and the fiber mixture as the raw material of the core material after the mixing. The heat shrinkable film is selected from PE, LLDPE, PP, PVC, PET and the like. The stretched moisture permeable film has a moisture permeability of 30 g / m 2 or less per 24 hours or a moisture permeability coefficient of 0.28 g / m 2 · h · mm Hg .

The vacuum insulation material core material of the present invention is finally wrapped in an aluminum packaging material and finally subjected to a packaging process.

Compression Molded Vacuum Insulation Core is a heat shrinkable film selected from PE, LLDPE, PP, PVC, PET, etc., wrapped on six sides, vacuum-packed with nylon, PET, PP, aluminum multilayer film, Is used.

The heat-shrinkable film selected from among PE, LLDPE, PP, PVC and PET is used for the six-sided wrapping packaging used in the present invention. In the heat insulation material requiring moisture resistance, the moisture permeability of the film is 30 g / A film having a moisture permeability of 0.28 g / m 2 · h · mm Hg or less is used. Wrapping packaging is performed once or twice. The PE film package is wrapped with a PE film and sealed with heat adhesive. The shrink film package such as LLDPE is wrapped with a shrink film such as LLDPE and shrink wrapped using a shrink packing machine.

PE, LLDPE, PP, PVC, and PET, and it is possible to improve physical properties such as bending strength, hygroscopicity and light weight. In addition, when a film having moisture resistance is used, it is required to satisfy the criteria of the energy saving design of the building and to omit the process of installing the moistureproof film on the inner wall of the building. Lt; / RTI >

Other processes for the manufacture of internal core materials include blending a synthetic silica-containing powder mixture with an organic fiber-containing fiber mixture; Drying the moisture of the formulation; The step of compacting the dried formulation is possible.

Another inner core manufacturing process includes blending a synthetic silica-containing powder mixture with an organic fiber-containing fiber mixture; Compressing the combination; The step of drying the compressed compound is possible.

Particularly, since the vacuum insulator can bend naturally from a plate-like state to a gravitational force, it does not require a process such as heating or cooling for deformation of the vacuum insulation material, Since the shape deformed by the frictional force with the synthetic silica is maintained, no separate shape retaining member is required.

The heat insulating material 130 having the above-mentioned characteristics included in the ice box according to the present invention can exhibit a sufficient heat insulating effect even if it occupies about 10% to 50% of the spacing space 123. In addition, the vacuum insulation material 130 having the above-described characteristics can achieve almost the same insulation effect even with a thinner thickness than the conventional vacuum insulation material. Accordingly, the vacuum insulating material 130 can be easily inserted into the auxiliary insulating material 140 to maximize the heat insulating performance of the ice box. According to this embodiment, the vacuum heat insulator 130 is composed of the bending vacuum insulator 130a and the flat plate type vacuum insulator 130b. The bending type vacuum insulator 130a is bent along the outer surface of the inner case 110 so as to surround the outer side surfaces of the two side surfaces 112 and the bottom surface 111 of the inner case 110 facing each other. And the flat plate type vacuum insulator 130b is disposed on an outer surface of a side portion 112 of the outer side surface of the inner case 110 where the bending type vacuum insulator 130a is not disposed.

Here, in the general ice box, the side portion 112 is slightly inclined so that the inner case 110 can be easily separated from the manufacturing mold in the course of producing the inner case 110. When three or more inclined side portions 112 are surrounded by the curved vacuum insulating material 130a provided in the form of a rectangular panel, a relatively large empty space is generated, which adversely affects the heat insulating performance. The bending type vacuum insulator 130a is formed in the shape of a rectangular panel and is bent along the outer surface of the inner case 110. The bending type vacuum insulator 130a is formed on the bottom surface 111 of the inner case 110 and on both sides of the bottom surface 111 So as to surround the outer side surfaces of the two side portions 112 facing each other. Particularly, the areas of the first side portion and the second side portion facing each other of the four side portions 112 of the inner case 110 are equal to each other, and the third side portion and the fourth side portion, If the area is larger than the area, the bending type vacuum insulator 130a may be arranged so as to surround the bottom surface 111, the outer side surfaces of the first and second side surfaces. At this time, the outer surface of the inner case 110 can be covered with the bending vacuum insulation material 130a at the maximum.

On the other hand, when the ice box is formed in a rectangular parallelepiped shape and the outer surfaces of the inner case have different areas, a pair of outer surfaces facing each other with the widest area among the plurality of outer surfaces, It is desirable to arrange a flexible vacuum insulation material on the other outer side to be connected to maximize the heat insulation effect by the vacuum insulation material.

The vacuum insulator 130 is attached to the inner case 110 by an adhesive member 131 such as a double-sided tape or hot melt disposed along the edge of the adhesive surface (the surface facing the outer surface of the inner case 110) 110).

That is, since the edge of the bonding surface is fixed to the outer side surface of the inner case 110 by the adhesive member 131, the vacuum heat insulating material 130 can be easily vacuum- It is possible to prevent the heat insulating performance of the vacuum heat insulating material 130 from deteriorating. The adhesion between the vacuum insulating material 130 and the inner case 110 is prevented from being arbitrarily separated due to a difference in thermal strain between the vacuum insulating material 130 and the inner case 110. The area of the surface of the vacuum insulation panel 130 opposed to the inner case 110 is not adhered to the outer surface of the inner case 110 .

The auxiliary insulating material 140 is made of expanded polyurethane and is injected into a spacing space 123 between the inner case 110 and the outer case 120 in a flowable state, 123).

The lid part 150 is provided with a vacuum insulating material and an auxiliary insulating material therein to open and close the receiving space 115 of the inner case 110. The lid part 150 is rotatably installed on one side of the upper end of the inner case 110 However, it is also possible to open and close the accommodation space 115 in a state separated from the inner case 110.

The vacuum insulator 130 may be disposed closely to the outer surface of the inner case 110 in the spacing space 123 between the inner case 110 and the outer case 120, And the auxiliary heat insulating material 140 is filled in the remaining space. That is, it is advantageous to arrange the heat insulating material having excellent heat insulating performance close to the outer side of the inner case 110 because the adiabatic volume increases as it moves toward the outer case 120 in the spacing space 123.

However, when a plurality of heat insulating materials having different materials are disposed between the inner case and the outer case, the main heat insulating material is disposed on the inner surface of the outer case and the remaining space of the space is filled with an auxiliary insulating material such as foamed urethane Was used. Although it is advantageous to arrange the main heat insulating material on the inner case side in such a conventional heat insulating material arrangement structure, disposing the main heat insulating material on the side of the outer case is advantageous in that the main heat insulating material in the form of a panel is bent along the curved surface of the object surface This is because when the main insulating material is disposed on the outer surface of the inner case, the edge portion of the main insulating material is optionally peeled off from the surface to be installed, thereby deteriorating the heat insulating performance. In addition, in the process of filling the auxiliary insulating material, since the auxiliary insulating material is not sufficiently filled in the peeled portion between the main insulating material and the outer case, the main insulating material is disposed on the inner surface of the outer case.

However, since the vacuum insulator 130 of the present embodiment is made to be able to be bent by physical external pressure, the vacuum insulator 130 is not deformed arbitrarily, Since the vacuum heat insulating material 130 is not peeled off from the outer surface of the inner case 110 at any time even if the vacuum insulating material 130 is attached to the outer surface of the inner case 110, Lt; / RTI > Since the edge of the bonding surface of the vacuum insulating material 130 is fixed to the side of the inner case 110 by the adhesive member 131 in the process of filling the remaining space of the spacing space 123 with the auxiliary insulating material 140, (130) is prevented from flowing between the vacuum insulating material (130) and the inner case (110).

Hereinafter, a coupling structure of the ice box using the bending type vacuum insulator according to the first embodiment of the present invention will be described.

FIG. 4 is a cross-sectional view of an ice box using a bending type vacuum insulator according to the present invention, and FIG. 5 is a bottom perspective view showing a state in which an inner case and a vacuum insulating material are combined according to an ice box using the bending- 6 and 7 are graphs showing the results of testing the heat insulating performance of the ice box using the conventional ice box and the bending vacuum insulation according to the present invention in a constant temperature and humidity chamber, The result of the test for the insulation performance of the used ice box is a graph.

As shown in FIGS. 4 and 5, the ice box using the bending type vacuum insulator according to an embodiment of the present invention includes an inner case 110 and an outer case 120, A space 123 is formed between the outer case 120.

The bending type vacuum insulator 130a disposed on the outer surface of the inner case 110 among the spacing spaces 123 includes one side portion 112 of the inner case 110 and a bottom portion 111 and the outer side surface of the other side surface portion 112 facing the one side surface portion 112 and is in close contact with the outer surface of the inner case 110.

The bending strength of the vacuum heat insulating material 130 according to the present embodiment is far superior to the bending strength of the conventional plate-shaped vacuum insulating material using inorganic fibers as reinforcing fibers. Therefore, when the bending type vacuum insulator 130a having the vacuum insulator 130 bent along the outer surface of the inner case 110 is disposed, the portion of the edge 114 between the bottom portion 111 and the both side portions 112 The heat insulation effect can be improved because the leakage of heat through the edge 114 surrounded by the vacuum insulation material 130 is prevented.

As shown in FIG. 5, the two side portions 112 on which the bending type vacuum insulator 130a is not disposed are formed on the outer surface of the inner case 110. The flat type vacuum insulator 130b having a width corresponding to the side portion 112 .

The bending type vacuum insulator 130a and the flat plate type vacuum insulator 130b are bonded to the outer surface of the inner case 110 through the adhesive member 131 disposed along the edge of the surface facing the inner case 110 .

That is, since the edge of the vacuum insulation material 130 is fixed to the outer surface of the inner case 110, the vacuum insulation material 130 and the inner case 110 can be easily separated from each other due to the difference in thermal strain between the material constituting the vacuum insulation material 130 and the inner case 110 The adhesive surface of the inner case 110 is prevented from being arbitrarily separated. The area of the surface of the vacuum insulation panel 130 opposed to the inner case 110 is not adhered to the outer surface of the inner case 110 . It is therefore possible to prevent the auxiliary insulating material 140 from penetrating between the inner case 110 and the vacuum insulating material 130 when the auxiliary insulating material 140 is foamed and to prevent the auxiliary insulating material 140 from penetrating the bottom surface 111 or the side surface 112 of the inner case 110 Even if the outer surface of the inner case 110 is spaced apart from the vacuum insulator 130 due to the folding phenomenon, unpleasant noise due to the adhesive component of the adhesive member 131 is not generated.

The auxiliary insulating material 140 is filled in the space 123 between the inner case 110 and the outer case 120 to further improve airtightness and heat insulation performance. The auxiliary insulating material 140 is made of foamed polyurethane and the expanded polyurethane is supplied into the spacing space 123 and then expanded so as to fill the spacing space 123 so that the heat of the portion where the vacuum insulating material 130 is not disposed So that the vacuum insulator 130 is kept in close contact with the outer surface of the inner case 110.

It can be seen that the bending strength of the vacuum insulation material produced by the present invention is far superior to the bending strength of the vacuum insulation material composed of inorganic fibers. The test results are shown in Example 1.

The flexural strength (flexural strength) was measured in accordance with KS M 3808 and was calculated using the following equation (1).

W: Maximum load (N)

ℓ: Distance between points (㎝)

b: Test piece width (cm)

h: Specimen thickness (cm)

As a result, the heat insulating performance can be improved by applying the vacuum insulating material which is easy to bend to the ice box.

The present invention is characterized in that the area A of the vacuum insulator 130 attached to the inner case 110 and the area B filled with the auxiliary insulator 140 are 70% or more. It is not easy to remarkably improve the heat insulating performance if the specific area A of the area where the vacuum heat insulating member 130 and the auxiliary heat insulating member 140 are applied to the inner case 110 is 70%

Hereinafter, the effects of the present invention will be described in more detail through experimental examples. It will be apparent to those skilled in the art that these embodiments are for illustrative purposes only and that the scope of the present invention is not construed as being limited by these examples.

[Experimental Example 1]

Bending strength measurement of the vacuum insulation material of the present invention compared to the conventional vacuum insulation material

Table 1 below shows the flexural strength of the vacuum insulator 130 of the present invention as measured against the plate-type vacuum insulator using inorganic fibers as reinforcing fibers.

division Conventional plate- The
Flexible vacuum insulation (130) Bending strength (N / cm2) 30-50 20-23

As shown in Table 1, when the vacuum insulating material 130 is composed of a core material containing synthetic silica and organic fibers, the conventional inorganic fibers can be bent relatively easily as compared with a plate-type vacuum insulating material using reinforcing fibers. It is possible to bend along the outer surface of the inner case 110 by using the vacuum insulation material 130 according to the present invention. Therefore, by disposing one vacuum insulator 130 integrally formed along at least three of the plurality of outer surfaces provided in the inner case 110 in close contact with each other, a portion of the corner 114 positioned between the surface and the surface The heat can be prevented from leaking.

[Experimental Example 2]

Comparison of insulation performance of the ice box of the present invention compared to the conventional ice box

Table 2 below shows the heat insulation performance of the ice box of the present invention versus the conventional ice box.

Herein, the heat insulating performance of the present invention is evaluated by comparing the time for maintaining a predetermined temperature of the conventional ice box, in which the vacuum insulating material 130 is not applied, and the ice box according to the present invention.

Ambient temperature division Volume Refrigerant ratio Initial temperature Minimum temperature Initial ~ 15 ℃ 36 ℃ Conventional technology 50L 18% 35.5 DEG C 12.5 DEG C 47 minutes Invention 35.6 ° C 8.1 ℃ 808 minutes

Table 2 is a table summarizing the results of testing the heat insulating performance of the ice box in which the conventional ice box and the vacuum insulating material 130 according to the present invention are applied to a constant temperature and humidity chamber.

An ice box was installed in a constant temperature and humidity chamber and an ice pack of 18% (9 L) cold source, which is the capacity of the present invention compared to the capacity of 50 L of the conventional product, was set to 36 Respectively. As shown in FIG. 6, the product was found to have a temperature of 12.5 ° C., and the present invention had a temperature of 8.1 ° C. , Which is due to the difference in insulation performance under the same conditions (initial temperature, product capacity, cold source input ratio, etc.). As a result of comparing the holding time from the initial point (35.5 ° C) to 15 ° C, it was 47 minutes for the conventional product and 808 minutes for the present invention (13 hours and 28 minutes) Which is about 17 times higher than that of the conventional method.

7, an ice box was installed in a constant temperature and humidity chamber, and an ice box of the present invention and a conventional ice box using a polyurethane as a main heat insulating material in a state where an ambient temperature was set at 38 [deg. Insulation performance in a state where the ice pack which is 33% (15 L) cold source (cold source) equally charged to the products A and B is compared with the capacity 50L is as follows. Polyurethane insulation was applied only to the body of the conventional product A, and polyurethane insulation was applied to the body and the lid of the conventional product B. Polyurethane insulation was applied to the lid of the ice box of the present invention.

As shown in FIG. 7, when the initial temperature of the ice box to be tested was about 38 ° C, the lid was closed and the cooling was started by the cold source. As a result, as shown in FIG. 7, B is about 7.1 DEG C, and the ice box of the present invention is about 7.3 DEG C, which can be attributed to the presence of the lid insulation material. As a result of comparing the maintenance time from the initial point (38 ° C.) to 12 ° C., the time for keeping the temperature of the conventional product B was 7 hours and 3 minutes, and the temperature of the ice box of the present invention was 19 hours and 6 minutes. The performance is remarkably improved by more than 2.7 times compared to the conventional product B. On the other hand, the conventional product A continued to rise after the lowest temperature of 17.1 ° C after the start of the test, and was not comparable with the ice box of the present invention.

Table 3 is a table summarizing the results of testing the insulation performance of the conventional ice box and the ice box using the vacuum insulation material 130 according to the present invention.

Ambient temperature division Volume Refrigerant ratio Initial temperature Minimum temperature Initial ~ 8 ℃ 18-25 ° C Conventional technology 50L 24% 22.0 DEG C 5.4 ° C 4 hours 52 minutes Invention 22.4 DEG C 0.2 ℃ 88 hours 4 minutes

As shown in Table 3, similar results were also obtained when installed in an ordinary room and tested under the same conditions.

The ice box of the present invention was charged in the same manner as the ice pack of 24% (12 L), which is a cold source of 50 L, compared with the capacity of the existing product. As shown in FIG. 7, when the initial temperature of the product was about 22 ° C, the lid was closed and the product was cooled down by the cold source. As a result, as shown in FIG. 7, Was -0.2 ° C, which was due to the difference in insulation performance under the same conditions (initial temperature, product capacity, cold source input ratio, etc.). Also, as a result of comparing the holding time from the initial stage (about 22 ° C) to 8 ° C, it was found that the conventional product had 4 hours and 52 minutes and the ice box of the present invention had 88 hours and 4 minutes. Is significantly improved by about 18 times as compared with the conventional product.

As can be seen from the above experimental results, when the bending vacuum insulation material 130a is used to prevent the leakage of heat through the edge 114 of the inner case 110, an excellent insulation and cooling effect is provided, It is possible to provide a thin ice box and a light ice box as compared with a general ice box.

Next, an ice box using a bending type vacuum insulator according to a second embodiment of the present invention will be described.

9 is a perspective view showing an inner case of an ice box using a bending type vacuum insulator according to a second embodiment of the present invention, and FIG. 10 is a perspective view showing the inner case of the ice box using the bending type vacuum insulator according to the second embodiment of the present invention, Fig.

According to the second embodiment of the present invention, a transparent window 116 is formed in the side surface portion 112 of the inner case 110 so that a part of the vacuum heat insulating material 130, which is disposed on the outer surface of the inner case 110, And is displayed visually through the receiving space 115 of the display unit 110 in the first embodiment.

In the case of forming the transparent window 116 in which the vacuum thermal insulating material 130 is visible through a part of the inner case 110 as described above, it is easy to check whether the defect is caused by a defect in the completed icebox through the transparent window 116 There is one advantage. In particular, it is possible to grasp defects due to the vacuum insulation material 130, and thereby to facilitate the convenience of the manufacturing process.

Next, a method for manufacturing an ice box using a bending type vacuum insulator according to the present invention will be described.

FIG. 11 is a process flow chart of a method of manufacturing an ice box using a bending type vacuum insulator according to the present invention, and FIGS. 12 to 15 are views of respective steps of a method for manufacturing an ice box using the bending vacuum insulation material of the present invention.

As shown in FIG. 11, the method of manufacturing an ice box using a curved vacuum insulation material according to an embodiment of the present invention includes a step S11 of preparing a vacuum insulation material 130, a step S11 of forming a curved vacuum insulation material 130a, (S13) of fixing the flat plate type vacuum insulator 130b to the outer side surface of the inner case 110, a step S13 of fixing the plate type vacuum insulator 130b to the outer side surface of the inner case 110, (S14) of supplying urethane (F), a step (S15) of joining outer case 120 and inner case 110, expansion and curing step (S16) of expanded polyurethane (F) (150) assembling step (S17).

12, in the step S11 of preparing the vacuum insulation material 130, the two side surfaces 112 facing each other and the curved surface 111 disposed on the bottom surface 111 of the outer case of the inner case 110 Type vacuum insulator 130a and a flat plate type vacuum insulator 130b to be fixed to the remaining side portions 112 in which the bending type vacuum insulator 130a is not disposed are provided respectively and the bending type vacuum insulator 130a and the plate- An adhesive member 131 such as a double-sided tape or a hot melt is disposed on the edge of the bonding surface of the vacuum heat insulating member 130b (the surface facing the outer surface of the inner case 110).

Fig. 13 (a) shows the cross section in the direction A in Fig. 12, and Fig. 13 (b) shows the cross section in the direction B in Fig.

The bending type vacuum insulator 130a is bent along the outer surface of the inner case 110 and the bonding surface of the bending type vacuum insulator 130a is bent to the inner side of the inner case 110 as shown in Fig. The bending type vacuum insulator 130a is adhered to the inner case 110 by the adhesive member 131 when the bending type vacuum insulator 130a is brought into close contact with the bottom face portion 111 disposed between the two side faces 112 and the two side faces 112, (S12).

13 (b), the bonding surface of the flat plate type vacuum insulator 130b is bonded to the side surface portion 112 on the outer side surface of the inner case 110 where the bending type vacuum insulator 130a is not disposed The flat plate type vacuum insulator 130b is fixed to the outer surface of the inner case 110 by the adhesive member 131 (S13).

14, an appropriate amount of polyurethane foam F is supplied to the inside of the outer case 120 (S14), and the outer case 120 is assembled to the inside of the outer case 120 (S15 The upper end of the side portion 122 of the outer case 120 and the flange 113 of the inner case 110 engage with each other and the spacing space 123 between the outer case 120 and the inner case 110 is closed. At this time, the expanded polyurethane supplied to the inside of the outer case 120 expands and flows along the spacing space 123 between the outer case 120 and the inner case 110 to fill the spacing space 123, (S16) to form the auxiliary thermal insulating material 140. [

Particularly, when the auxiliary insulating material 140 is formed as described above, since the expanded polyurethane F expands in the closed spaced space 123 between the inner case 110 and the outer case 120, The foamed polyurethane foam F can be filled in the spacing space 123 and the foamed polyurethane foam F expands in the closed spaced space 123 to increase the density of the heat insulating material to provide better heat insulating performance than the general heat insulating material .

Meanwhile, although not shown in the drawing, the lid 150 may be assembled on the upper side of the ice box manufactured as described above, and the receiving space 115 of the inner case 110 may be closed. At this time, it is also possible to arrange the vacuum insulation material 130 in the inner space of the lid part 150, and then supply the foamed polyurethane F to form the auxiliary insulation material 140 that fills the inner space.

The scope of the present invention is not limited to the above-described embodiments, but may be embodied in various forms of embodiments within the scope of the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

110: inner case, 111: bottom portion, 112: side portion,
113: flange, 114: corner, 115: accommodation space,
116: transparent window, 120: outer case, 121: bottom portion,
122: side portion, 123: spacing space, 130: vacuum insulation material,
130a: bending type vacuum insulation material, 130b: flat plate type vacuum insulation material,
131: Adhesive member, F: Foamed polyurethane, 140: Auxiliary insulation material,
150:

Claims (13)

An inner case having a bottom portion and a plurality of side portions and having a receiving space formed therein and having an upper surface opened;
An outer case surrounding the bottom of the inner case and a plurality of side portions so that a space is formed between the inner case and the outer case;
A bending type vacuum insulation material bending along the outer side surfaces of the two side surfaces and the bottom surface of the inner case facing each other in the spaced space;
A flat plate type vacuum insulation material disposed on outer side surfaces of two opposite side portions of the inner case; And
And an auxiliary heat insulating material filled in the space between the inner case and the outer case. The method according to claim 1,
And an adhesive member for fixing the bending vacuum insulation material to the inner case is disposed at an edge of the surface of the bending vacuum insulation material facing the inner case. 3. The method of claim 2,
Wherein a transparent window is formed on at least one of a bottom surface portion and a plurality of side surface portions of the inner case so that a bending vacuum insulation material or a part of the flat plate type vacuum insulation material is observed. The method according to claim 1,
Wherein the auxiliary heat insulating material is foamed polyurethane. The method according to claim 1,
Wherein the thickness of each of the bending-type vacuum insulation panel and the flat panel-type vacuum insulation panel is 10 to 50% of the spacing of the spacing spaces. The method according to claim 1,
Wherein the thickness ratio of any one of the bending type vacuum insulation material and the flat plate type vacuum insulation material to the auxiliary insulation material is 1: 9 to 5: 5. The method according to claim 1,
And a lid for opening and closing a space for accommodating the inner case, wherein a vacuum insulation material is disposed inside the ice storage box. The method according to claim 1,
Wherein each of the bending-type vacuum insulation panel and the flat panel-type vacuum insulation panel includes a core made of synthetic silica and organic fibers. 9. The method of claim 8,
Wherein the synthetic silica has a BET specific surface area of 40 to 400 m < 2 > / g and an average particle size of 5 to 50 nm. 9. The method of claim 8,
Wherein the organic fiber has a diameter of 1 to 100 μm and a length of 6 to 40 mm. 9. The method of claim 8,
Wherein the bending type vacuum insulator and the flat plate type vacuum insulator comprise: a heat shrink film wrapping six surfaces of the core material; And a packaging material for vacuum packing the core material wrapped with the heat shrinkable film. 9. The method of claim 8,
Wherein the content of the organic fibers in the core material is 0.5 to 10 parts by weight based on 100 parts by weight of the core material of the vacuum insulation material. Disposing an adhesive member on the edge of the surface of the vacuum insulator facing the inner case;
Tightly fixing the bending type vacuum insulation material so as to be continuous to at least three outer surfaces of the bottom surface portion of the inner case and the outer surface of the side surface portion;
Installing a flat plate type vacuum insulation material on the outer side surfaces of the bottom surface portion and the side surface portion of the inner case where the bending type vacuum insulation material is not disposed;
Supplying foamed polyurethane to the inside of the outer case;
Combining the inner case and the outer case; And
And expanding and curing the foamed polyurethane to form an auxiliary insulating material in a space between the inner case and the outer case.

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