KR20060069746A - Vacuum isolation material for refrigerator cabinet and manufacturing method thereof and isolation structure of refrigerator cabinet applying the same - Google Patents

Abstract

The present invention relates to a vacuum insulator of a refrigerator cabinet and a manufacturing method thereof, comprising: a core material formed of a polystyrene material to have a honey comb shape; A metal thin film sheet sealed by welding to surround the core material and to block the core material from the outside; Including, to ensure a more stable heat insulation effect and at the same time provides a vacuum insulation for a refrigerator cabinet having easy, light and high rigidity.

Refrigerator Cabinet, Vacuum Insulation, Honeycomb Core

Description

Vacuum insulation material for refrigerator cabinet and its manufacturing method and insulation structure of refrigerator cabinet to which the same is applied.

1 is a perspective view of a refrigerator cabinet;

2 is a cross-sectional view of a conventional heat insulation structure according to the cutting line X-X of FIG.

3 is a cross-sectional view of another conventional heat insulation structure according to cutting line X-X in FIG.

Fig. 4 is a side sectional view showing the construction of the vacuum insulator of Fig. 3;

Fig. 5 is a side sectional view showing the folded shape of the film to install the vacuum insulator of Fig. 4 as a heat insulation structure of the refrigerator cabinet.

FIG. 6 is a side sectional view showing a shape in which the vacuum insulator of FIG. 5 is installed in a refrigerator cabinet; FIG.

Figure 7 is a sectional perspective view of the main portion showing the configuration of a vacuum insulator for a refrigerator cabinet according to an embodiment of the present invention.

FIG. 8 is a perspective view showing the structure of a honeycomb core material of portion 'A' of FIG. 7; FIG.

Figure 9 is a side cross-sectional view showing the configuration of a vacuum insulator for a refrigerator cabinet according to another embodiment of the present invention.

FIG. 10 is a side sectional view showing a shape in which the vacuum insulator of FIG. 9 is installed in a refrigerator cabinet; FIG.

** Description of symbols for the main parts of the drawing **

1: refrigerator cabinet 10: cabinet exterior

20: Inside cabinet 30: Cabinet insulation

100, 100 ': vacuum insulation 110, 100': metal thin sheet

111, 111 ': First sheet 112, 112': Second sheet

120: honeycomb core material

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum insulator for a refrigerator cabinet and a method for manufacturing the same, and more particularly, to a vacuum insulator for a refrigerator cabinet and a method for manufacturing the same.

The refrigerator is for storing food at low temperature, and includes a cabinet for forming a storage space such as a refrigerator compartment or a freezer compartment for storing food, a door for opening and closing the refrigerator compartment and the freezer compartment, and a machine for keeping the stored food at a low temperature state. It consists of wealth.

Here, the cabinet is filled with a heat insulating material between the outer surface forming the outer shape and the inner surface forming the storage space to increase the cold effect. In recent years, light and excellent insulation polyurethane is used as a material of the heat insulating material, the polyurethane foaming liquid is injected between the inner surface and the outer surface of the cabinet in the assembled state by heating and foaming to fill the insulation inside the cabinet.

1 is a perspective view of a refrigerator cabinet, FIG. 2 is a sectional view of a conventional heat insulation structure according to the cutting line XX of FIG. 1, FIG. 3 is a sectional view of a conventional heat insulation structure of another form according to the cutting line XX of FIG. 3 is a cross-sectional view showing the configuration of the vacuum insulator of FIG.

As shown in the figure, the heat insulation structure of the refrigerator cabinet 1 includes a cabinet outer surface 10 formed to protect against external shocks, a cabinet inner surface 20 in which food products, etc. are accommodated, a cabinet outer surface 10 and It is composed of a cabinet heat insulating portion 30 formed between the cabinet inner surface 10 to improve the refrigeration and freezing efficiency.

The cabinet outer surface 10 is formed of an iron plate having high rigidity and impact resistance to protect from external impact, etc., the cabinet inner surface 20 is extrusion molded into ABS resin and processed into a desired shape.

The cabinet heat insulating part 30 is formed to increase the refrigerating and freezing efficiency of the inside of the refrigerator cooled by the refrigeration cycle, and is mainly formed by filling the polyurethane foam foamed by reacting the polyurethane foam.

In the figure, reference numeral 20a is a protrusion formed to place a shelf for storing food on the cabinet inner surface 20.

On the other hand, as shown in Figure 3, in addition to the heat insulating portion 30 formed of polyurethane foam between the cabinet outer surface 10 and the cabinet inner surface 20 further comprises a vacuum heat insulating material 40, the refrigerator cabinet The heat insulation effect can be improved further.

The vacuum insulator 40 is, as shown in Figure 4, the core material 41 formed to enhance the heat insulation effect by increasing the heat transfer resistance, and the core material 41 to maintain the vacuum of the core material 41 Getter 43 formed to maintain the thermal insulation performance as a vacuum insulator for a sufficient period of time by removing the sealing film 42 formed of an aluminum laminate film to seal and encapsulating the gas component penetrating through the thermal insulation sealing film 42. It is configured to include).

The vacuum heat insulating material 40 comprised as mentioned above puts the material of the core material 41 into the aluminum laminate film bag 42, and makes the inside into a vacuum state. Then, in order to maintain a vacuum state, it is manufactured by heat-sealing and vacuum-sealing the opening part of the film bag 42. At this time, the core material 41 of the conventional vacuum insulation 40 is laminated with a panel made of glass fiber or formed of polyurethane open foam or extruded polystyrene, silica or pearlite powder, the core material 41 In addition to the high cost in the manufacture of), there was also a problem in that a process of putting a powder or the like into the film bag 42 and vacuum sealing is difficult.

In addition, the conventional vacuum heat insulating material 40 configured as described above should be applied to the getter 43 is essential because the performance is degraded due to the vacuum is broken for a long time due to the air transmitted through the aluminum laminate film, as shown in Figure 4 As described above, since most of the getters 43 applied to maintain the vacuum are applied to the vacuum insulator 40 by digging out part of the core material 41, the manufacturing process is inconvenient and takes a long time. Since the surface of the vacuum insulator 40 to which the getter 43 is applied has a surface protruding or crushing, the vacuum insulator 40 has a problem that the getter 43 is not precisely attached to the inner surface 20 of the refrigerator cabinet. In addition, as the getter 43 is positioned at a specific position of the core material 41, the gas removal performance around the getter 43 is excellent, but the gas removal performance is worse as the distance from the getter 43 increases, resulting in stable thermal insulation performance. It was also difficult to get problems.

On the other hand, as shown in Figure 4, the vacuum insulator 40 is heat-sealed with a sufficient excess length 42 'in the process of welding the aluminum film envelope to maintain the airtightness. However, when the vacuum insulator 40 is to be attached to the inner surface 20 of the refrigerator cabinet, the protruding film 42 'is attached after folding, as shown in FIGS. 5 and 6. In addition to the step of folding 42 '), the larger the size of the vacuum insulator 40, the smaller the size of the vacuum insulator 40, due to the large air pocket 50 generated in folding the protruding film 42'. There was also a problem that has a greater adverse effect on the thermal insulation effect of.

The present invention has been made to solve the problems of the prior art as described above, to provide a vacuum insulator for a refrigerator cabinet having a more stable thermal insulation effect and easy to manufacture, light and high rigidity without using a getter. The purpose.

It is still another object of the present invention to provide a vacuum insulator for a refrigerator cabinet having a simple configuration and capable of producing a stable heat insulating effect at a lower cost.

The present invention is a core material formed in a honeycomb (honey comb) shape in order to achieve the object as described above; A metal thin film sheet sealed by welding to surround the core material and to block the core material from the outside; It provides a vacuum insulator for a refrigerator cabinet, characterized in that configured to include.

This, by forming the core material of the vacuum insulating material in a honeycomb shape, it is possible to implement a vacuum insulating material having a light and high rigidity.

Here, since the metal thin sheet is welded using a stainless steel material, it is possible to maintain the degree of vacuum for a long time even without a getter, thereby making it easy to store and to ensure a reliable thermal insulation effect.

The metal thin film sheet is preferably formed to a thickness of 0.1mm to 1mm. If the thickness of the metal thin film sheet is formed to a thin thickness of 0.1 mm or less, the metal thin film sheet may be torn and may release the vacuum state that seals the core material, which is inappropriate. When the thickness of the metal thin film sheet is formed to a thickness exceeding 1 mm, This is because handling of the vacuum insulator is disadvantageous due to the weight of the metal thin film sheet.

In addition, it is effective that the core material is formed of a polystyrene material which is inexpensive, has high thermal stability, and has a small amount of gas discharge in a vacuum state.

And, the honeycomb fin size (d) of the core material is preferably formed in the range of 0.1mm to 10mm. If the honeycomb fin size (d) is formed smaller than 0.1mm it is difficult to expect the heat insulation effect according to the vacuum, and if the honeycomb fin size (d) is formed larger than 10mm it is disadvantageous in terms of strength of the vacuum insulation.

In addition, the metal thin film sheet is composed of two sheets of a first sheet and a second sheet, the first sheet is laid flat on the bottom surface of the core material, the core material is placed on the first sheet, It is effective that the two sheets are formed so as to cover the top and side surfaces of the core material. This is, in order to maintain the airtightness, the weld bonding portion of the metal thin film sheet is thermally fused with a sufficient length to prevent air pockets generated in the folded portion when attaching the vacuum insulator due to the length thereof. This is because an insulation effect can be obtained.

On the other hand, the present invention and the outer surface of the refrigerator cabinet formed of steel; An inner surface of the refrigerator cabinet formed of a plastic material; A refrigerator insulation unit formed of a foam foam between an outer surface and an inner surface of the refrigerator cabinet; The vacuum insulator positioned between an outer surface and an inner surface of the refrigerator cabinet; It provides an insulating structure of the refrigerator cabinet, characterized in that configured to include.

On the other hand, according to another field of the invention, the present invention, a method of manufacturing a vacuum insulator for the refrigerator cabinet, the step of putting the metal sheet and the core material in a vacuum chamber; Wrapping the core material with the two metal sheet sheets in the vacuum chamber; Welding the two sheet metal sheets along an edge of the core material to form a vacuum insulator; Removing the vacuum insulator from the vacuum chamber; It provides a method for producing a vacuum insulator for a refrigerator cabinet, characterized in that configured to include.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention.

As shown in FIGS. 7 and 8, the vacuum insulator 100 for a refrigerator cabinet according to an embodiment of the present invention includes a core material 120 and a core material 120 formed in a honeycomb shape using a polystyrene material. It comprises a thin film sheet 110 formed of a stainless steel of 0.2mm thickness to seal and wrap the core material 120 to maintain the vacuum of the.

The core material 120 should not only have thermal stability capable of withstanding the high temperature and high pressure environment of forming the polyurethane foam that forms the insulation structure of the refrigerator cabinet, but also should be made inexpensively, and the gas release even in a vacuum state. It is made of polystyrene material that can be minimized.

In addition, the honeycomb-shaped core material 120 should have a fin size of 10 mm or less to secure strength as a vacuum insulator, and in order to prevent the heat insulation effect from being suppressed by increasing the heat transfer rate by conduction of the core material 120 itself. It is desirable to have a fin size larger than 0.1 mm. In addition, the honeycomb thickness is effective in that the volume fraction occupied by the vacuum portion of the honeycomb structure itself is 90% or more in terms of obtaining high heat insulation performance. As the core material 120, a polystyrene material, which is one of plastic materials, is used to form a honeycomb shape that is stable in terms of structural strength, thereby obtaining light and high strength.

The thin film sheet 110 has the first sheet 111 and the second sheet 112 on the upper and lower surfaces of the core material 120, and the first sheet 111 and the second sheet along the periphery of the core material 120. Sealing 112 by welding by thermal fusion prevents outside gas from penetrating into the vacuum insulator 100. In particular, the thin film sheet 110, which has been conventionally formed of an aluminum film, is formed of stainless steel, thereby preventing the thin film sheet 110 from being damaged due to scratching or external impact, thereby destroying the vacuum state of the vacuum insulator 100. . In order to prevent the thin film sheet 110 formed of stainless steel from being damaged by external impact or scratching, the thin film sheet 110 may be formed to a thickness of 0.1 mm or more. That is, since the thin film sheet 110 is hardly damaged even by external scratches or impacts, and the external gas is hardly penetrated, the vacuum sheet may be vacuumed for a long time even if it does not include a getter for removing gas from the outside. By maintaining the state can be obtained excellent heat insulation effect. Furthermore, as the thin film sheet 110 forming the outer shell is formed of stainless steel having high strength, the side effect of facilitating handling can also be obtained.

9 and 10, the vacuum insulator 100 ′ for a refrigerator cabinet according to another embodiment of the present invention may include a core material 120 and a core material ( The first sheet 111 ′ formed along the bottom surface of the 120, and the second sheet 112 ′ formed to surround the top and side surfaces of the core material 120, include the first sheet 111 ′ and the second sheet. The sheet 112 'is constructed in a welded form. That is, the second sheet 112 'is shaped like a hat surrounding the core material 120.

Similarly, the thin film sheet 110 ′ composed of the first sheet 111 ′ and the second sheet 112 ′ is also formed of a stainless steel material having a high strength and has a cap shape of the second sheet 112 ′. The deep drawing is used to fit the shape of the core material 120 is used.

On the other hand, the length (X) of the protrusions (111a, 112a) for the heat fusion between the first sheet 111 'and the second sheet 112', it is difficult to sufficiently ensure the vacuum, When the length X of the protrusion for thermal fusion is formed larger than 5 cm, since the material of the thin film sheet is wasted, it is formed in a size of 0.5 cm to 5 cm. The length X of such a protrusion is smaller than the length of the conventional film protrusion 42 ', and is made possible by forming the thin film sheet 110' of stainless steel having high rigidity. On the other hand, the height (Y) of the second sheet 112 'may be formed in various ways corresponding to the height of the core material 120, but is generally formed in the range of 1mm to 50mm.

10 illustrates a heat insulation structure of a refrigerator cabinet constructed by using the vacuum insulation material 100 ′ for a refrigerator cabinet according to another embodiment of the present invention configured as described above. Compared with FIG. 6, the protrusion X of the thin film sheet 110 ′ of the vacuum insulator 100 ′ for the refrigerator cabinet according to the present invention is not only much smaller than the conventional 42 ′, but also of the refrigerator cabinet. Not only does not require a process of folding the protrusion X to attach to the inner surface 20, but also the first sheet 111 'of the thin film sheet 110' is in close contact with the inner surface 20 of the refrigerator cabinet. As a result, since the air pocket 50 is not generated according to the protrusion, the heat insulation effect is not lowered.

Hereinafter, the manufacturing method of the vacuum heat insulating material 100, 100 'comprised as mentioned above is explained in full detail.

The thin metal sheets 110 and 110 ′ and the core material 120 are placed in a vacuum chamber in which the vacuum is maintained at about 10 ⁻³ torr. Then, the core material 120 is wrapped with the metal sheet 110, 110 ′ of the first sheet 111, 111 ′ and the second sheet 112, 112 ′ in the vacuum chamber, and then along the peripheral edge of the core material 120. The interface between the first sheets 111 and 111 'and the second sheets 112 and 112' is welded and thermally fused to block the outside. Then, when the vacuum insulator 100, 100 'composed of the thin sheets 110, 110' and the core material 120 is taken out of the vacuum chamber and placed in an atmospheric pressure, the vacuum inside the vacuum insulator 100, 100 'is removed. Due to the pressure difference between the state and the external atmospheric state, the surfaces of the vacuum insulators 100 and 100 'become taut and smooth surfaces, and thus are applicable to the insulation structure of the refrigerator cabinet.

At this time, in the step of wrapping the core material 120 with the metal thin sheet 110 ', after placing the first sheet 111' on the bottom in the vacuum chamber, the core material 120 is placed on the first sheet 111 '. The upper surface and the side surface of the core material 120 are wrapped with the second sheet 112 'deeply processed in the shape of the core material 120, and then the protrusions 111a and 112a are welded.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.

As described above, according to the present invention, a core material formed of a polystyrene material to have a honey comb shape; A metal thin film sheet sealed by welding to surround the core material and block the core material from the outside; Including, to ensure a more stable heat insulation effect and at the same time provides a vacuum insulation for a refrigerator cabinet having easy, light and high rigidity.

In addition, the present invention is welded by using a stainless steel material to the metal thin sheet, it is possible to maintain a vacuum degree for a long time even without a getter (getter) to ensure easy and reliable thermal insulation effect.

And, the metal thin film sheet of the present invention is composed of two sheets of the first sheet and the second sheet, the first sheet is placed flat on the bottom of the core material, the core material is placed on the first sheet, Since the second sheet is formed to cover the upper surface and the side surface of the core material, it is possible to shorten the length of the heat-sealed portion due to the welding to reduce the material cost, as well as to reduce the cost of the thin film sheet in the process of applying to the insulating structure of the refrigerator cabinet. Since the air pockets generated in the folding process can be removed at the same time as the folding process is removed, a better heat insulating effect can be obtained.

Claims (10)

A core material formed into a honey comb shape; A metal thin film sheet sealed by welding to surround the core material and to block the core material from the outside; Vacuum insulator for refrigerator cabinet, characterized in that configured to include. The method of claim 1, The metal thin film sheet is a vacuum insulating material for a refrigerator cabinet, characterized in that formed of stainless steel material. The method of claim 1, The metal thin film sheet is a vacuum insulation material for a refrigerator cabinet, characterized in that formed in a thickness of 0.1mm to 1mm. The method of claim 1, The core material is a vacuum insulation material for a refrigerator cabinet, characterized in that formed of a polystyrene (Polystrene) material. The method of claim 1, Honeycomb fin size (d) of the core material is a vacuum insulator for a refrigerator cabinet, characterized in that formed in less than 10mm. The method according to any one of claims 1 to 5, The metal thin film sheet is composed of two sheets composed of a first sheet and a second sheet, The first sheet is placed flat on the bottom of the core material, The core material is placed on the first sheet, And the second sheet is formed to cover the upper surface and the side surface of the core material. The method of claim 6, A length (X) protruding for thermal fusion of the first sheet and the second sheet is a vacuum insulator for a refrigerator cabinet, characterized in that 0.5cm to 5cm. An outer surface of the refrigerator cabinet formed of steel; An inner surface of the refrigerator cabinet formed of a plastic material; A refrigerator insulation unit formed of a foam foam between an outer surface and an inner surface of the refrigerator cabinet; A vacuum insulator according to any one of claims 1 to 6 located between an outer surface and an inner surface of the refrigerator cabinet; Insulation structure of a refrigerator cabinet, characterized in that configured to include. A method for producing a vacuum insulator for a refrigerator cabinet according to any one of claims 1 to 5, Placing the thin metal sheet and the core material in a vacuum chamber; Wrapping the core material with the sheet metal sheet in the vacuum chamber; Welding the thin metal sheet along an edge of the core material to form a vacuum insulator; Removing the vacuum insulator from the vacuum chamber; Method for producing a vacuum insulator for a refrigerator cabinet, characterized in that configured to include. The method of claim 9, Wrapping the core material with the sheet metal sheet, Placing one said sheet of metal sheet on the floor; Laying the core material on the sheet of metal sheet; Wrapping the other thin sheet metal sheet on the top and side surfaces of the core material; Method for producing a vacuum insulator for a refrigerator cabinet, characterized in that it comprises.

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