CN2800193Y - Refrigerator - Google Patents

Abstract

The refrigerator of the utility model is characterized in that the glass wool liner is made into a core material and stored in a gas isolation container, and the inside is vacuum-exhausted to be attached to the refrigerator cavity as a vacuum insulation board (5, 6) of the board body. On the inner surface of the heat insulating space of the body (1), in the structure where the polyurethane foam (8) is foamed and filled in the remaining space and embedded, the vacuum heat insulating panels are stacked 2 times with respect to the thickness direction of the heat insulating space. slice or more. By effectively arranging the vacuum insulation panels with respect to the insulation space of the cavity, the thermal insulation performance can be greatly improved, the power saving effect can be increased, the storage volume efficiency of the storage room can be improved, and a cavity with a large thermal insulation effect can be easily manufactured. .

Description

refrigerator

technical field

The invention relates to a refrigerator in which a vacuum heat insulation panel is attached in the heat insulation space of a cavity and forms a heat insulation layer together with a foam heat insulation material.

Background technique

In the past, as the heat insulating material of the heat-insulating box of the refrigerator, it has become the mainstream to use polyurethane foam with low thermal conductivity and rigidity through the integration of the outer box and the inner box constituting the cavity by foam filling. Vacuum insulation panels are partially used as heat insulating materials to further improve the heat insulation performance of the cavity and reduce power consumption by preventing heat leakage, or to increase the volumetric efficiency of refrigerators by reducing the thickness of the heat insulating wall.

As an example of application to a refrigerator, a vacuum insulation panel 55 with a basic structure is shown in FIG. The core material 55a is a resin foam with an open cell structure that forms a small space and can maintain its shape under atmospheric pressure, or inorganic fine powder and fibers, and a gas isolation container 55b made of a laminated film of synthetic resin and aluminum foil. The container 55b is coated with a material 55a, and the opening is made into a sealing structure of a heat-sealed portion 55c after vacuum suction is performed in the container 55b.

In addition, in order to suppress the deterioration over time caused by the increase in internal pressure caused by the external air generated from the core material 55a, the sealing surface of the gas isolation container 55b, and the permeated gas entering from the surface, etc., and to maintain the degree of vacuum, Generally, metals such as titanium and magnesium; alloys such as barium and lithium; oxides such as cobalt oxide, calcium oxide, and zeolite; activated carbon, etc., are used as substances for adsorbing moisture, oxygen, nitrogen, etc. The configured getter 55e is sealed.

For heat insulation performance, inorganic fine powder such as perlite is used as the core material. Since the wall thickness of the fine powder solid itself is relatively large and the space volume for heat insulation is small, as shown in Figure 8, the continuous cell resin foam is used as the core material. The structure of the core material has strength limitations due to the size of the air bubble particles, so the thermal conductivity of the vacuum insulation panel has a limit of about 0.005 to 0.007 W/mK.

As a material that can obtain a thermal conductivity lower than that, there is glass wool with a fiber diameter of several μm or less. When it is used as a core material, a large number of small spaces are formed, so a low thermal conductivity of about 0.002W/mK can be realized. The vacuum insulation panel with the glass wool as the core material is fixedly arranged on the inner surfaces of the refrigerator and the door by fixing with tape and using double-sided adhesive tape or hot-melt adhesive, and by bonding with rigid polyurethane foam Body and used to make a refrigerator that maintains the strength of the box and has high thermal insulation performance. (For example, refer to Patent Document 1)

[Patent Document 1] Japanese Patent Laid-Open No. 2003-28562

As shown in FIG. 9, the vacuum insulation panel 55 is arranged on the surface of the outer box 52, the inner box 53, and the doors 60, 61 of the refrigerator 51 on the side of the insulation space 58 to improve the insulation performance of the vacuum insulation panel. There is a method of increasing the thickness of the vacuum insulation panel. However, for the thickening of the panel thickness, the glass wool gasket as the core material in the previous stage of vacuum suction is in the raw cotton state because it is the final form. 10 times the thickness becomes very large and requires a large temporary storage space in mass production.

In order to reduce the volume, there is a method of using an adhesive and performing heat and pressure molding, but because of the need for processing steps, and when only increasing the thickness of the plate due to the effect of thermal bridges (Japanese: ヒ一トブリツジ), it depends on the thickness. The thermal conductivity is increased, so the thickness of a practical vacuum insulation panel is limited to about 15mm.

Contents of the invention

The present invention is made in consideration of the above-mentioned problems, and its object is to provide a vacuum insulation panel that can greatly improve the heat insulation performance and increase the power saving effect by effectively arranging the vacuum insulation panel with respect to the heat insulation space of the cavity, or improve The storage volume of the storage compartment is efficient, and a refrigerator having a cavity with a large heat insulating effect can be easily manufactured.

In order to solve the above-mentioned problems, the refrigerator of the present invention is characterized in that a glass wool gasket is used as a core material and stored in a gas isolation container, and a vacuum insulation panel as a plate body is attached to the cavity of the refrigerator by vacuum-exhausting the inside. In the structure in which polyurethane foam is foam-filled and embedded in the remaining space on the inner surface of the insulating space, two or more of the vacuum insulation panels are stacked with respect to the thickness direction of the insulating space.

With this structure, the heat insulation effect of the cavity after using the vacuum insulation panel can be found, and the effect of saving electricity as a refrigerator can be greatly reduced, and the large-scale temporary maintenance of the vacuum insulation panel in the production process of the heat insulation cavity can be reduced. Make space.

Description of drawings

Fig. 1 is a schematic cross-sectional view showing the front of a refrigerator according to an embodiment of the present invention.

Fig. 2 is a detailed cross-sectional view of the vacuum insulation panel provided in Fig. 1 .

Fig. 3 is a schematic diagram showing a vacuum suction state of the vacuum insulation panel of Fig. 2 .

Fig. 4 is a longitudinal sectional view of Fig. 1 showing a state in which a vacuum insulation panel is arranged.

Fig. 5 is a cross-sectional view showing in detail the overlapping state of the vacuum insulation panels.

Fig. 6 is a schematic front view of a refrigerator showing a pattern attached to a vacuum insulation panel.

Fig. 7 is a cross-sectional view showing a basic structure of a vacuum insulation panel.

Fig. 8 is a comparative graph showing the difference between the degree of vacuum and the thermal conductivity of the core material.

Fig. 9 is a longitudinal sectional view showing an example of a refrigerator using a conventional vacuum insulation panel.

Detailed ways

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a schematic sectional view of a refrigerator according to the present invention. The main body 1 of the refrigerator is formed by providing an insulating space between an outer case 2 formed of a thin steel plate forming the outer shape of the main body and an inner case 3 made of synthetic resin forming a storage compartment.

On the inner surface of the two side walls 2a of the outer box 2 forming the heat insulating space, the vacuum insulation panels 5 and 6 described in detail later are attached as heat insulators, and in the gap with the rest of the inner box 3, the in-situ foaming method is used. The stock solution of the foamed heat insulating material 8 made of polyurethane foam is injected, foamed and filled, and the inner and outer boxes 2, 3 and the vacuum heat insulating panel 5 are bonded and solidified integrally to form a rigid heat insulating cavity.

The vacuum insulation panel 5, as shown in FIG. 2 and FIG. 3 which shows the vacuum suction state of the panel, uses fine glass fiber wool, that is, glass wool as the core material 5a, which is formed into a gasket shape, and The core material 5a is inserted into a gas-insulated container 5b with a thickness of 80-100 μm made of a laminated film of aluminum foil and synthetic resin. On the two-layer stage 7b installed in the chamber 7, after vacuum exhausting at the level of 0.03-30Pa by the vacuum pump 7c, the opening of the container is closed with a binding margin of 20-50mm, and the The remaining 10 mm width is heat-sealed 5c to form a plate shape that maintains the inside of the container in a vacuum and reduced pressure state.

For the fiber diameter of the core material 5a of glass wool, a material less than or equal to 10 μm with good thermal insulation performance as a vacuum insulation panel is generally selected. In this embodiment, a material with a diameter of 3-5 μm is used, and the fiber length is also mixed The long fiber body is greater than or equal to 50mm, but the short fiber of about 10mm is used as the main body. In addition, knitting (Japanese: ニビドリング) processing, which is not usually used for short fiber materials, utilizes the good thermal insulation performance and shape retention characteristics of short fiber glass wool.

The cushion-shaped core material 5a formed above is cut into a predetermined size, or in a state where the cushion is properly stacked to a final desired thickness, and then inserted into the gas isolation container 5b. Processing reduces its thickness to a fraction. In addition, since the fabric body is hard, the insertion operation into the gas isolation container 5b can be easily performed, and the size of the gas isolation container 5b itself can be reduced compared with the conventional gasket shape with a high volume, so that the gas isolation container 5b itself can be reduced before the vacuum panel is formed. The temporary storage space in the mass production line in the state of the gasket is also reduced, and the size of the vacuum chamber 7 itself for accommodating the gasket can also be reduced.

And, the gas isolation container 5b after inserting the core material 5a is subjected to vacuum suction in the vacuum chamber 7, and the opening thereof is made into a heat-sealed portion 5c, and then the core material 5a is sealed by using the air pressure difference caused by opening the chamber 7 to the atmosphere. It is further compressed to about 1/2, so the final thickness becomes 10-15mm.

In the case of this embodiment, the thickness dimension is formed to be 12mm, and the vertical and horizontal dimensions are respectively formed to be 500mm and 1400mm, and the hinge portion 7d is used as a fulcrum to rotate the outer cover 7e in the upward direction of the arrow. The vacuum insulation panel 5 is slidably taken out from the open opening of the heat-seal rod 7f which moves up and down.

The vacuum insulation panel 5 formed as described above is a member whose thermal conductivity is equal to or less than 0.003 W/mK at the central part of the panel surface. After taking out the vacuum insulation panel 5, the rubber-based coating is uniformly coated along almost the entire surface of one side surface. The hot-melt adhesive 9, which is a thermoplastic resin, is supplied, placed, and pressurized to the upper part of the inner wall surface of the outer box 2 in a flat state moving on the conveyor belt of the refrigerator assembly line, and is bonded by hot-melt bonding. The adhesive force of the agent 9 is applied at predetermined intervals from the front, rear and upper and lower ends of the outer case on the side of the heat-insulating space forming both side walls of the planar outer case 2 .

The outer box 2 after bonding the vacuum insulation panels 5 and forming the upper side and both sides in an inverted U-shape in the following process is formed into a box shape by attaching a bottom panel and a rear panel, and, Combined with the inner box 3 forming the storage room, the polyurethane sealing process is performed, and the remaining part between the inner and outer boxes is filled with a foaming and insulating material 8 made of polyurethane foam for the space, and the inner and outer boxes 3 are sealed. , 2 and the vacuum insulation panel 5 are integrally bonded and solidified, and the refrigerated space is made with a heat-insulated wall thickness of 50 mm, and the freezer space is made with a heat-insulated wall thickness of 65 mm to form a rigid heat-insulated chamber.

If there is a space between the vacuum insulation panel 5 and the outer box 2 of the refrigerator, the outer surface of the outer box will be dented, which will cause poor appearance and weaken the rigidity of the chamber. The flow of the polyurethane stock solution is hindered, and the unfilled portion of the polyurethane foam insulation material 8, that is, the formation of voids, causes a decrease in the insulation performance. Therefore, when the vacuum insulation panel 5 is fixed to the outer box of the refrigerator, care must be taken not to A gap is created in the flat outer box inner face.

At this time, the surface of the vacuum insulation panel 5 is smooth with little unevenness and warpage, and the fixing to the inner surface of the outer case 2 can be reliably adhered to the hot-melt portion 9 without creating a gap.

The vacuum insulation panels 5 are arranged on the rear surface 2b of the main body and each of the refrigerator compartment 10, the vegetable compartment 11, and the freezer compartment 12, as shown in the longitudinal sectional view of the refrigerator in FIG. If the doors 10a, 11a, 12a are used on the inner surface side of the outer surface material, etc., if they are flat and have a relatively large area, they can be installed easily and have a good heat insulation effect.

In addition, the inside of the outer box 2 and the door outer panel has a detailed structure as shown in FIG. The heat insulation panels 6 are attached in a stacked state. For example, the vacuum insulation panels 5 that are attached to a flat surface such as the inner surface of the side wall of the outer box 2 are provided with resin with a thickness of about 0.5 mm. The thermal insulation layer made of sheet 15, the second sheet of vacuum insulation panel 6 is placed on the outer surface of the resin sheet 15, and the same as the first sheet 5, it is pasted with hot-melt adhesive 9. The surface of the plate 5 of the sheet is pressed and fixed in close contact.

As mentioned above, in the mass production process before vacuum suction, the relationship between the temporary storage space of the spacer due to the increase in volume due to the thickness of the glass wool spacer is to make the thickness of 15mm the limit of the vacuum. The heat insulation effect of the heat insulation panel 5 is greater because the heat insulation wall is formed by overlapping two vacuum insulation panels 5 and 6 with a thickness of 15 mm or less in this embodiment. The large space for the pads to be temporarily placed in the mass production line can reduce the amount of heat leakage from the insulating wall.

In addition, by laminating two vacuum panels 5 and 6 and sandwiching the resin sheet 15 formed with a thermal insulator, heat conduction from the wall surface side panel 5 to the inner panel 6 can be prevented, and heat from the outer surface of the outer box 2 can be prevented from passing through the panel 5. The phenomenon that the heat conduction from the peripheral portion of the gas insulation container 5b made of a laminated film in the thickness direction of the heat insulating wall returns, that is, a so-called thermal bridge, can effectively maintain the heat insulating effect of the vacuum heat insulating panels 5 and 6 .

The heat insulation between the boards 5 and 6 is not limited to the resin sheet 15, as long as the heat insulation board body of the polyurethane foam molded product with a thickness of about 5mm is sandwiched, the heat insulation effect can be increased and the thermal bridge can be eliminated more reliably. .

According to the experiment of the present invention, as mentioned above, the thermal conductivity λ in the case where the vacuum insulation panels 5 and 6 with a thickness of 12 mm are stacked is 0.0037 W/mK, which is compared with the conventional case where no vacuum insulation panel is used. A heat leak prevention effect improved by about 18% can be obtained.

This value is more than 20% better than the thermal conductivity (0.0047W/mK) in the case of making the vacuum insulation panel 24mm thick with one sheet. The method of overlapping the above plates has the effect of eliminating thermal bridges and thermal leakage.

Therefore, when two vacuum insulation panels with a thickness of 12 mm and low thermal conductivity are used in a heat insulating space with a thickness of 50 mm, the thickness of the remaining space becomes 26 mm to ensure sufficient flow space for the polyurethane foam, and it can be used in refrigerators. The amount of external heat leakage becomes less and efficient thermal insulation can be obtained.

As mentioned above, the vacuum insulation panels 5 are not only stacked in two sheets on the inner side of the outer panel of the outer box 2, etc., but also can be attached to the panel 6 as shown in the A part of FIG. Attached to the heat-insulating space side of the wall surface of the inner box 3 opposite to the thickness direction of the plate 5 attached to the inner surface of the outer box 2, and also as shown in the B part of FIG. 6, the second plate 6 is arranged on the The heat insulating space located between the outer box 2 and the inner box 3 may be finally embedded in the polyurethane foam heat insulating material 8 injected into the heat insulating space.

In the case of the above structure, the two boards 5 and 6 are not in a close contact state, and the polyurethane foam heat insulating material 8 made by in-situ foaming is filled between the boards, and the board is buried in the foamed heat insulating material, and the board becomes the core material. The effect of increasing rigidity can be obtained as a refrigerator cavity, but in this case, it is necessary to ensure a gap of at least about 10 mm between the plates so that the polyurethane foam in the foaming process can flow.

In addition, if the adiabatic space side of the affixed board 1 is formed without concavities and convexities, the flow of the polyurethane stock solution becomes smoother, and it can be filled without forming voids. Finally, it can have good thermal insulation performance and make the polyurethane The close contact between the foam heat insulating material 8 and the inner case 3 and the outer case 2 and the vacuum insulation panel 5 becomes firm, and the cavity 1 having high rigidity can be constituted.

In addition, in the above-mentioned embodiment, the case where two sheets of vacuum insulation panels 5 and 6 are overlapped has been described, but the number of overlapping panels is not limited to two, and of course more sheets can be overlapped. For the part where the temperature difference between the outside air and the place where the refrigerator is installed is large, the freezing space 12 and the temperature switching chamber 13, and the part where the cooler is installed, the temperature difference between the side wall of the refrigerating room 10 and the outside air is large. For the few parts, it is effective to selectively adopt one piece of bonding as shown in part C of FIG. 6 .

In addition, even if it is used in the machine room 16 and the heat radiation pipe part where the temperature of the outer box side increases, the thermal insulation effect of the overlapping plates 5 and 6 is also effective. As mentioned above, it is necessary to consider the shielding of the position away from the complicated structural parts in order to prevent the heat conduction of the outer box surface from deteriorating the heat insulation effect.

In the above-mentioned embodiment, the structure of attaching the vacuum insulation panel with the hot-melt adhesive 9 has been described, but the bonding method is not limited to the hot-melt adhesive, and double-sided adhesive tape can also be used for close bonding. Incidentally, in this case, the adhesive tape is applied substantially all over the surface, so that it is in a state of being uniformly adhered to the cavity surface.

In addition, the refrigerator is not limited to household refrigerators, but is also applicable to commercial use, freezers, automatic vending machines, and other heat-insulated box structures.

Industrial availability

The present invention can be applied to a refrigerator equipped with a vacuum insulation panel for improving heat insulation performance, reducing power consumption, or increasing the volume of a storage room.

Claims (6)

1, a kind of refrigerator, it is characterized in that, the mineral wool liner is made core to be housed in the gas barrier container, inside is done after the vacuum exhaust as the vacuum heat-insulating plate of plate body and be attached on the adiabatic space inner face of refrigerator cavity, in the structure of in remaining space, the polyurethane foam foam filling being buried underground it, described vacuum heat-insulating plate is set more than 2 with respect to the thickness direction of adiabatic space is overlapping.

2, refrigerator as claimed in claim 1 is characterized in that, vacuum heat-insulating plate is overlapping, and accompanies the little material of thermal conductivity between each gas barrier container.

3, refrigerator as claimed in claim 1 is characterized in that, coating hot-melt adhesive or attach the double-sided adhesive band and make heat-insulating shield overlapping each other on the single side face of vacuum heat-insulating plate.

4, as claim 2 or 3 described refrigerators, it is characterized in that, between vacuum heat-insulating plate, accompany the heat guard plate of thin thickness.

5, refrigerator as claimed in claim 1 is characterized in that, a side of vacuum heat-insulating plate is installed on the inner face of outer container of adiabatic space, the outside of case or the mid portion of adiabatic space in the opposing party is configured in.

6, refrigerator as claimed in claim 1 is characterized in that, is provided with the overlapping vacuum heat-insulating plate that sets in the adiabatic space of refrigerating chamber periphery.

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