KR20210078842A - Vacuum adiabatic body and refrigerator - Google Patents

Abstract

The present invention relates to a vacuum insulator comprises a cover assembly provided in front of an end of a plate member to at least cover a conductive resistance sheet. The cover assembly includes: a cover insulating material for covering the conductive resistance sheet; a cover housing in which at least a portion of the cover insulating material is accommodated therein; a heating member placed on an outer surface of the cover housing to provide heat; and a heating member cover in contact with the heating member and extending toward a second plate member to transfer the heat of the heating member to the conductive resistance sheet. According to this configuration, the inner side of a refrigerator blocks heat and the outer side of the refrigerator conducts heat, so that the effect of preventing dew formation and blocking cold air leakage can be increased.

Description

Vacuum insulator and refrigerator {Vacuum adiabatic body and refrigerator}

The present invention relates to a vacuum insulator and a refrigerator.

A vacuum insulator is an article that suppresses heat transfer by maintaining a vacuum inside the body. Since the vacuum insulator can reduce heat transfer by convection and conduction, it can be applied to a heating device and a refrigeration device. On the other hand, although the insulation method applied to the conventional refrigerator differs depending on refrigeration and freezing, it was a general method to provide a foamed polyurethane insulation wall having a thickness of about 30 cm or more. However, there is a problem in that the internal volume of the refrigerator is reduced by this.

There is an attempt to apply a vacuum insulator to the refrigerator in order to increase the internal volume of the refrigerator.

First, there is the applicant's registered patent 10-0343719 (cited document 1). According to the registered patent, a vacuum insulation panel is manufactured, the vacuum insulation panel is built into the wall of the refrigerator, and the outside of the vacuum insulation panel is finished with a separate molded product made of Styrofoam. According to the above method, foaming is not required, and the effect of improving thermal insulation performance can be obtained. This method has problems in that the cost increases and the manufacturing method becomes complicated.

As another example, Laid-Open Patent Publication 10-2015-0012712 (Citation Document 2) provides a wall with a vacuum insulation material and in addition, it is presented in a technique for providing an insulation wall with a foam filler. This method also has problems in that the cost increases and the manufacturing method is complicated.

As another example, there was an attempt to manufacture the wall of the refrigerator as a single product, a vacuum insulator. For example, US Patent Publication No. US2040226956A1 (Citation 3) discloses providing an insulating structure of a refrigerator in a vacuum state. However, it is difficult to obtain a practical level of insulation effect by providing the wall of the refrigerator in a sufficient vacuum state. In detail, it is difficult to prevent the heat transfer phenomenon between the contact part between the outer case and the inner case having different temperatures, it is difficult to maintain a stable vacuum state, and it is difficult to prevent the deformation of the case due to the negative pressure of the vacuum state. There is a problem of Due to these problems, the technology of Citation 3 is also limited to cryogenic refrigeration equipment, and it does not provide a level of technology that can be applied at home.

As another method, the applicant of the present invention has applied for Korean Patent Application Laid-Open No. 10-2017-0016187, a vacuum insulator and a refrigerator. In the present invention, both the door and the main body of the refrigerator are provided with vacuum insulators, and in particular, a large insulating material is added to the rim of the door to block cold air leaking from the contact portion between the rim of the main body and the door. However, there is a problem in that manufacturing is complicated and the internal volume of the refrigerator is greatly reduced.

In addition, since the internal space of the vacuum insulator is empty in a vacuum state, the strength is weak compared to the conventional article filled with a resin material such as polyurethane, and there is a problem in that deformation such as bending or buckling occurs.

In the refrigerator to which the vacuum insulator is applied, dew condensation may occur in a portion where the body and the door are in contact. The dew condensation may occur where the outside air meets the cold air leaking from the inside of the refrigerator. For example, dew condensation occurs in the portion where the body and the door are in contact. As a specific means for preventing dew formation in a refrigerator using the vacuum insulator, there is no known prior art.

In the case of a refrigerator to which the vacuum insulator is applied, since the inside of the vacuum space is narrow, it is difficult to place the hotline inside the vacuum space. As a related technology, Korean Patent Laid-Open Patent Publication No. 1020090133018 filed by the applicant, a refrigerator having a partition member, includes a hotline 150 on the outer surface of the partition member 160 that partitions the freezing chamber 130 up and down. A separate foam member is provided as a heat insulating member inside the partition member. The hotline 150 is covered by a front cover 170 .

Registered Patent 10-0343719 7 of Patent Publication 10-2015-0012712 US Patent Publication No. US2040226956A1 Korean Patent Application Laid-Open No. 10-2017-0016187 with FIGS. 2, 3, 4, and 8, and related descriptions Republic of Korea Patent Publication No. 1020090133018 FIGS. 3 to 5 and related descriptions

The present invention is proposed in the background described above, and an object of the present invention is to block cold air leaking from a contact portion between a body and a door.

An object of the present invention is to secure a sealing interval narrowly provided by a vacuum insulator.

An object of the present invention is to increase the internal volume of the refrigerator.

An object of the present invention is to reinforce the weakness of the conductive resistance sheet, which is provided thinly to resist conduction heat transfer to the outside and is vulnerable to external impact.

An object of the present invention is that various parts necessary for the original operation of the device can be installed without affecting the insulation performance of the vacuum insulator.

An object of the present invention is to allow a worker to conveniently manufacture a refrigerator using a vacuum insulator.

An object of the present invention is to prevent dew from forming on a portion in contact with a body and a door in a refrigerator using a vacuum insulator.

A vacuum insulator according to the present invention includes: a first plate member defining at least a portion of a wall for a first space; a second plate member defining at least a portion of a wall for a second space having a temperature different from that of the first space; a sealing part sealing the first plate member and the second plate member to provide a third space that is a temperature between the temperature of the first space and the temperature of the second space and is a space in a vacuum state; a supporting unit for maintaining the third space; a conductive resistance sheet for connecting the first plate member and the second plate member to each other in order to reduce the amount of heat transfer between the first plate member and the second plate member; and an exhaust port for discharging the gas of the third space. According to this configuration, it is possible to provide a vacuum insulator that achieves the objectives of strength maintenance, vacuum degree maintenance, and heat conduction reduction.

A cover assembly provided in front of an end of the plate member is included to cover at least the conductive resistance sheet, the cover assembly comprising: a cover insulating material for covering the conductive resistance sheet; a cover housing in which at least a portion of the cover insulation is accommodated therein; a heating member placed on the outer surface of the cover housing to provide heat; and a heating member cover in contact with the heating member and extending toward the second plate member to transfer heat of the heating member to the conductive resistance sheet. According to this configuration, the inner side of the refrigerator is heat-blocked and the outer side of the refrigerator is heat-conducted, so that the effect of preventing dew formation and blocking cold air leakage can be increased.

A ratio (H/W) of a thickness of the cover assembly to a length of the cover assembly is within a range of 0.29 < H/W < 1.1. According to this, it is possible to implement a refrigerator in which dew does not form under normal use conditions of the refrigerator without interference between the members.

A place where the lowest surface temperature with the lowest temperature appears on the outer surface of the vacuum insulator is an adjacent region where the conductive resistance sheet is in contact with the second plate member. According to this, by well managing the temperature of the adjacent region, it is possible to provide a vacuum insulator in which dew does not form.

The ratio (T2/T2) of the minimum surface temperature to the outside air temperature is provided to be 0.8 or more, thereby realizing a refrigerator in which dew does not form under normal conditions.

The ratio (T2/T2) of the minimum surface temperature to the outside air temperature is provided to be 0.9 or more, so that it is possible to implement a refrigerator in which dew does not form on the surface of the refrigerator even in severe conditions.

A ratio (H/W) of a thickness of the cover assembly to a length of the cover assembly is within a range of 0.29 < H/W < 0.90. Accordingly, it is possible to obtain the cover assembly in which there is no interference between the members, the fluidity of the foaming liquid is high, heat penetration is reduced, and dew formation does not occur.

A ratio (H/W) of a thickness of the cover assembly to a length of the cover assembly is in a range of 0.37 < H/W < 0.6. According to this, it is possible to obtain a refrigerator that does not generate dew even in severe conditions and has high reliability in preventing dew formation.

The thickness of the cover assembly may be provided to be the same as the gap between the first plate member and the second plate member, thereby protecting the edge portion of the vacuum insulator in a thin state.

A refrigerator according to another aspect includes: a main body provided with a vacuum insulator and having an opening for an article accommodation space; a door for opening and closing the opening of the body; a gasket installed on the door for sealing a portion in contact with the door and the body; and a magnet provided to the gasket. A refrigerator may be constructed using the vacuum insulator having high thermal insulation performance according to the present invention.

a first plate member providing the vacuum space on one surface and an accommodation space on the other surface to provide the vacuum insulator; a second plate member spaced apart from the first plate member, the second plate member providing the vacuum space on one surface and the external space on the other surface; a sealing part sealing the first plate member and the second plate member; a supporting unit maintaining a gap between the second plate member and the second plate member; and a cover assembly provided on an edge of the opening. According to this, it is possible to implement a solid and reliable refrigerator.

The cover assembly may include a cover insulating material provided to insulate an edge of the opening; a cover housing covering one side of the cover insulation material and accommodating the cover insulation material therein; a heating member seated on the cover housing and providing heat to prevent dew formation in response to the outside temperature; and a heating member cover for guiding the heat of the heating member toward the second plate member, wherein the lowest surface temperature with the lowest temperature appears in an adjacent region where the second plate member and the conductive resistance sheet are in contact. Accordingly, it is possible to obtain a refrigerator in which the inner and outer sides of the vacuum insulator are thermally separated from each other at the edge of the vacuum insulator, so that heat penetration is reduced and dew formation is prevented. Since the portion with the lowest temperature is accurately displayed, by allowing the heating member to cover the corresponding portion, it is possible to manage the weakness of dew condensation and prevent dew formation in the first place.

The cover housing is provided with a resin, and the heating member cover is provided with a metallic magnetic material, and may interact with the magnetic force of the magnet. According to this, the inner side of the high temperature high temperature and the inner side of the high temperature high temperature are reliably separated, and the thermal atmosphere exerted therebetween can be shielded.

The cover insulation material is provided as a foam member, air, or a porous molded article of a resin material, so that the insulation of the front end portion of the body can be reliably performed.

The heating member is placed on the outer surface of the cover housing, and the heating member cover covers the heating member from the outside. According to this, it is possible to reduce the influence of the heating member on the inner space of the rim of the body, and the heat of the heating member can be mainly transmitted to the heating member cover.

The heating member cover, at least a portion of which extends to the conductive resistance sheet along the second plate member to absorb the cold air of the conductive resistance sheet, it is possible to prevent dew formation.

The heating member cover includes a heating member corresponding to the heating member; a conductive portion extending along the second plate member; and a fastening part fastened to the cover housing, wherein the heating member corresponding part, the conductive part, and the fastening part are respectively bent to each other. Accordingly, the hot air of the heating member can be smoothly guided toward the second plate member.

The cover housing includes an outer extension corresponding to the outer space; an inner extension corresponding to the inner space; and a front extension portion corresponding to at least a portion of the door, wherein the outer extension portion, the inner extension portion, and the front extension portion are bent to each other. According to this, it is possible to stably protect the inner space of the refrigerator, and the cover housing itself can be stably fastened to the vacuum insulator.

A ratio (H/W) of a thickness of the cover assembly to a length of the cover assembly is within a range of 0.29 < H/W < 1.1, and a ratio (T2/T1) of the lowest surface temperature to the outside air temperature is 0.8 More can be provided. Accordingly, it is possible to provide the cover assembly without interference between the members, and dew formation may not occur under the general conditions of use of a refrigerator.

A ratio (H/W) of a thickness of the cover assembly to a length of the cover assembly is within a range of 0.29 < H/W < 1.05. According to this, the cover assembly can be installed without interference between the members, and reliability in reducing dew formation can be secured.

A ratio (H/W) of a thickness of the cover assembly to a length of the cover assembly is in a range of 0.37 < H/W < 0.6, and a ratio (T2/T2) of the lowest surface temperature to the outside air temperature is 0.9 More can be provided. Accordingly, dew condensation may not occur on the outer surface of the refrigerator even under severe operating conditions of the refrigerator.

The ratio (T2/T2) of the minimum surface temperature and the outside air temperature is provided to be 0.9 or more, so that dew formation does not occur even in severe conditions.

A refrigerator according to another aspect includes, in the front cover part, a first area covered by a cover housing made of a material of low thermal conductivity; and a second region which is at least covered by the heating member cover made of a material having high conductivity and is in thermal contact with the heating member, and by the heat conducted to the conductive resistance sheet and the cold air transmitted from the conductive resistance sheet, The ratio (T2/T2) of the minimum surface temperature to the outside temperature is 0.8 or more, and the ratio (H/W) of the thickness of the cover assembly to the length of the cover assembly is 0.29 < H/W < 1.1. may be provided. Accordingly, it is possible to provide a refrigerator in which dew does not form on the outer surface of the refrigerator.

According to the present invention, there is an advantage in that, in a device such as a refrigerator, which can be opened and closed freely by applying a vacuum insulator, it is possible to increase the energy use efficiency of the device by blocking the leakage of cold air at the contact portion between the body and the door.

According to the present invention, the action of increasing the internal volume of the device by applying the vacuum insulator and the action of securing the sealing distance between the body and the door sufficiently long can be obtained together.

According to the present invention, it is possible to improve the reliability of the device using the vacuum insulator by blocking the external access of the conductive resistance sheet.

According to the present invention, it is possible to secure a space in which parts necessary for the operation of a device such as a refrigerator can be installed regardless of the insulation performance of the vacuum insulator.

According to the present invention, a worker can conveniently manufacture a refrigerator using a vacuum insulator, thereby improving product productivity.

According to the present invention, it is possible to implement a refrigerator using a vacuum insulator that prevents dew formation.

1 is a perspective view of a refrigerator according to an embodiment;
2 is a view schematically showing a vacuum insulator used for a main body and a door of a refrigerator;
3 is a view showing various embodiments of the internal configuration of the vacuum space part.
4 is a view showing various embodiments of a conductive resistance sheet and its peripheral portion.
5 is a graph showing a change in thermal insulation performance and a change in gas conductivity according to vacuum pressure by applying a simulation;
6 is a graph for observing the process of evacuating the inside of the vacuum insulator with time and pressure when the supporting unit is used.
7 is a graph comparing vacuum pressure and gas conductivity.
8 is a cross-sectional perspective view of the rim of the vacuum insulator.
9 and 10 are views schematically showing the front of the main body in a virtual state in which the inner surface is unfolded;
Fig. 11 is a cross-sectional view of the contact portion shown with the body closed by the door;
12 is a cross-sectional view of a contact portion between a body and a door according to another embodiment;
13 and 14 are partially cut-away perspective views of the inner surface, FIG. 13 is a state in which the fastening is completed, and FIG. 14 is a view showing the fastening process.
15 is a view sequentially explaining the fastening of the sealing frame in the case of an embodiment in which the sealing frame is provided with two members.
16 and 17 are views showing one end of the sealing frame. FIG. 16 is a view before the door hinge is installed, and FIG. 17 is a view in a state in which the door hinge is installed.
18 is a view for explaining the effect of the sealing frame according to the present invention in comparison with the prior art. ) is a cross-sectional view of the body and the door according to the prior art.
19 to 24 are views for explaining various embodiments in which the sealing frame is installed.
25 is a cutaway perspective view of a contact portion between a refrigerator and a door according to an embodiment;
26 is a cross-sectional view of a vacuum insulator rim for explaining the cover assembly.
27 to 31 are cross-sectional views showing a modified embodiment of the shoulder portion and the fastening portion of the arm in the cover assembly.
32 to 43 are cross-sectional views showing a modified embodiment in which the distance between the arms is further spaced apart.
44 is a cutaway perspective view of an edge portion of a vacuum insulator according to another embodiment;
45 is a cross-sectional view of an edge portion of a vacuum insulator according to another embodiment.
46 is a cross-sectional view of a boundary portion between a door and a body in a refrigerator according to another embodiment. FIG. 46 (a) shows the embodiment, and FIG. 46 (b) shows a comparative example explaining the advantages of the embodiment.
47 is an enlarged view showing the end of the vacuum insulator according to the another embodiment.
48 is an exploded perspective view of the cover assembly;
49 is a perspective view of a body in which a cover assembly is applied to a freezer compartment;
50 is an exploded perspective view of a body according to another embodiment;
51 is a view of thermal analysis performed on the cross section of the contact portion between the door and the body, and FIG. 52 (a) is an example, and FIG. 51 (b) is a comparative example.
52 is a temperature distribution diagram of the heating member cover according to the embodiment.
53 is a view of thermal analysis performed on the cross section of the contact portion between the door and the body, in which FIG. 53 (a) is an embodiment, FIG. 53 (b) is a comparative example, and FIG. 53 (c) is another embodiment .
54 is a graph showing the temperature distribution of the conductive part in the other embodiment.
Referring to the heat transfer path reference diagram shown in FIG. 55 , the path of heat penetration through the cover assembly will be described.
56 to 59 are views for explaining the results of various experiments. FIG. 56 is a refrigerator in which the heating member is installed, showing a main body applied to the experiment, and FIG. 57 is a case in which the length of the cover assembly is longest (H1). , FIG. 58 is a case in which the length of the cover assembly is medium (H2), and FIG. 59 is a case in which the length of the cover assembly is the shortest (H3).
60 is a graph showing a relative increase in penetration load based on a minimum penetration load using a ratio (length/thickness) of a thickness of the cover assembly to a length of the cover assembly as a factor;
Fig. 61 is a graph for explaining that the graph of Fig. 60 is moved left and right according to various requirements of the member;
62 is a graph showing the lowest surface temperature using a ratio (H/W) of a length of the cover assembly to a thickness of the cover assembly as a factor, similar to the graph of FIG. 60 ;
63 is a graph showing the horizontal axis as the ratio (H/W) of the length of the cover assembly and the thickness of the cover assembly, and the vertical axis as the ratio (T2/T1) of the lowest surface temperature and the outside temperature;

Hereinafter, specific embodiments of the present invention are proposed with reference to the drawings. However, the spirit of the present invention is not limited to the embodiments presented below, and those skilled in the art who understand the spirit of the present invention may add, change, delete, and add components to other embodiments included within the scope of the same spirit. It will be easy to suggest by, etc., this will also be included within the scope of the present invention.

In the drawings presented for the description of the embodiments below, different from the actual article, exaggerated, simple or detailed parts may be briefly displayed, but this is for the convenience of understanding the technical idea of the present invention, and the size presented in the drawings and should not be interpreted limited to structure and shape. However, we try to represent the actual shape as much as possible.

In the following embodiments, as long as they do not conflict with each other, the description of one embodiment may be applied to the description of another embodiment, and in a state in which only a specific part of the configuration of one embodiment is modified in the other configuration can be applied.

In the following description, vacuum pressure means any pressure state lower than atmospheric pressure. And, the expression that A has a higher degree of vacuum than B means that the vacuum pressure of A is lower than that of B.

1 is a perspective view of a refrigerator according to an embodiment.

Referring to FIG. 1 , a refrigerator 1 includes a main body 2 provided with a cavity 9 for storing stored items, and a door 3 provided to open and close the main body 2 . The door 3 may be rotatably arranged or slidably arranged to open and close the cavity 9 . The cavity 9 may provide at least one of a refrigerating compartment and a freezing compartment.

A component constituting a refrigeration cycle for supplying cold air to the cavity is provided. Specifically, a compressor 4 for compressing the refrigerant, a condenser 5 for condensing the compressed refrigerant, an expander 6 for expanding the condensed refrigerant, and an evaporator 7 for evaporating the expanded refrigerant to take heat ) is included. As a typical structure, a fan may be installed at a position adjacent to the evaporator 7 , and the fluid blown from the fan may be blown into the cavity 9 after passing through the evaporator 7 . By adjusting the amount of air blown by the fan and the blowing direction, adjusting the amount of circulating refrigerant, or adjusting the compression ratio of the compressor, the refrigeration load may be adjusted, thereby controlling the refrigerating space or the refrigerating space.

2 is a view schematically showing a vacuum insulator used for the main body and door of the refrigerator. The vacuum insulator on the body side is shown with the upper and side walls removed, and the vacuum insulator on the door side is part of the front wall. is a diagram of the removed state. In addition, the cross-section of the portion where the conductive resistance sheets 60 and 63 are provided is schematically shown to facilitate understanding.

Referring to FIG. 2 , the vacuum insulator includes a first plate member 10 providing a wall of a low temperature space, a second plate member 20 providing a wall of a high temperature space, and the first plate member 10 ) and a vacuum space portion 50 defined as a gap between the second plate member 20 is included. Conduction resistance sheets 60 and 63 for preventing heat conduction between the first and second plate members 10 and 20 are included. A sealing part 61 for sealing the first plate member 10 and the second plate member 20 is provided in order to seal the vacuum space part 50 . When the vacuum insulator is applied to a refrigerator or a refrigerator, the first plate member 10 may be referred to as an inner case, and the second plate member 20 may be referred to as an outer case. A machine room 8 is placed on the lower rear side of the vacuum insulator on the main body side, in which parts providing a refrigeration cycle are accommodated, and on either side of the vacuum insulator, air in the vacuum space part 50 is exhausted to create a vacuum state. An exhaust port 40 is provided for In addition, a conduit 64 passing through the vacuum space 50 may be further installed for the installation of defrost water and electric lines.

The first plate member 10 may define at least a part of a wall for a first space provided on the side of the first plate member. The second plate member 20 may define at least a part of a wall for a second space provided on the side of the second plate member. The first space and the second space may be defined as spaces having different temperatures. Here, the wall for each space may function not only as a wall in direct contact with the space but also as a wall not in contact with the space. For example, the vacuum insulator of the embodiment may be applied even to an article having a separate wall in contact with each space.

Factors causing the loss of thermal insulation effect of the vacuum insulator include heat conduction between the first plate member 10 and the second plate member 20 and heat radiation between the first plate member 10 and the second plate member 20, and gas conduction of the vacuum space part 50 .

Hereinafter, a heat resistance unit provided to reduce adiabatic loss in relation to the factor of heat transfer will be described. On the other hand, the vacuum insulator and the refrigerator of the embodiment do not exclude further having another heat insulating means on at least one side of the vacuum insulator. Therefore, it may further have a heat insulating means using foam or the like on the other surface.

3 is a view showing various embodiments of the internal configuration of the vacuum space part.

First, referring to FIG. 3A , the vacuum space unit 50 is provided as a third space at a pressure different from that of the first space and the second space, preferably in a vacuum state, so that insulation loss can be reduced. The third space may be provided at a temperature corresponding to a temperature between the temperature of the first space and the temperature of the second space. Since the third space is provided as a space in a vacuum state, the first plate member 10 and the second plate member 20 contract in a direction approaching each other by a force equal to the pressure difference in each space. The vacuum space 50 may be deformed in a smaller direction because of the In this case, an increase in the amount of radiation transmission due to the contraction of the vacuum space portion and an increase in the amount of conduction transmission due to the contact of the plate members 10 and 20 may cause thermal insulation loss.

A supporting unit 30 may be provided to reduce deformation of the vacuum space 50 . The supporting unit 30 includes a bar 31 . The bar 31 may extend in a direction substantially perpendicular to the plate member to support a gap between the first plate member and the second plate member. A support plate 35 may be additionally provided at at least one end of the bar 31 . The support plate 35 may connect at least two or more bars 31 and extend in a horizontal direction with respect to the first and second plate members 10 and 20 . The support plate may be provided in a plate shape, and may be provided in a grid shape so that an area in contact with the first and second plate members 10 and 20 is reduced to reduce heat transfer. The bar 31 and the support plate may be fixed in at least one part and inserted together between the first and second plate members 10 and 20 . The support plate 35 may contact at least one of the first and second plate members 10 and 20 to prevent deformation of the first and second plate members 10 and 20 . In addition, based on the extension direction of the bar 31 , the total cross-sectional area of the support plate 35 is greater than the total cross-sectional area of the bar 31 , so that the heat transferred through the bar 31 is It may be diffused through the support plate 35 .

As a material of the supporting unit 30, in order to obtain high compressive strength, low outgassing and water absorption, low thermal conductivity, high compressive strength at high temperature, and excellent workability, PC, glass fiber PC, low outgassing PC , PPS, and a resin selected from LCP may be used.

A radiation resistance sheet 32 for reducing thermal radiation between the first and second plate members 10 and 20 through the vacuum space portion 50 will be described. The first and second plate members 10 and 20 may be made of a stainless material capable of preventing corrosion and providing sufficient strength. Since the stainless material has a relatively high emissivity of 0.16, a lot of radiant heat transfer may occur. In addition, the emissivity of the supporting unit made of resin is lower than that of the plate member, and since it is not entirely provided on the inner surfaces of the first and second plate members 10 and 20, it does not significantly affect radiant heat. Therefore, the radiation resistance sheet is provided in a plate shape across most of the area of the vacuum space part 50 in order to focus on the reduction of radiant heat transfer between the first plate member 10 and the second plate member 20 . can be As a material of the radiation-resisting sheet 32, an article having a low emissivity is preferable, and in an embodiment, an aluminum thin plate having an emissivity of 0.02 may be preferably used. In addition, since it is not possible to obtain a sufficient radiation heat shielding effect with one sheet of radiation resistance sheet, at least two sheets of radiation resistance sheet 32 may be provided at a predetermined interval so as not to contact each other. In addition, at least one radiation resistance sheet may be provided in a state in contact with the inner surfaces of the first and second plate members 10 and 20 .

Referring to FIG. 3B , the spacing between the plate members may be maintained by the supporting unit 30 , and the porous material 33 may be filled in the vacuum space 50 . The porous material 33 may have a higher emissivity than stainless steel, which is a material of the first and second plate members 10 and 20, but since the vacuum space is filled, the resistance efficiency of radiant heat transfer is high.

In the case of this embodiment, there is an effect that the vacuum insulator can be manufactured without the radiation resistance sheet 32 .

Referring to FIG. 3C , the supporting unit 30 for maintaining the vacuum space part 50 is not provided. Instead of this, the porous material 33 was provided in a state wrapped in the film 34 . At this time, the porous material 33 may be provided in a compressed state so as to maintain a gap between the vacuum space portions. The film 34 may be provided in a state in which a hole is punched, for example, as a PE material.

In the case of this embodiment, the vacuum insulator can be manufactured without the supporting unit 30 . In other words, the porous material 33 may perform the function of the radiation resistance sheet 32 and the function of the supporting unit 30 together.

4 is a view showing various embodiments of a conductive resistance sheet and its peripheral portion. Although the structure of each conductive resistance sheet is simply illustrated in FIG. 2 , it will be understood in more detail through this drawing.

First, the conductive resistance sheet shown in FIG. 4A can be preferably applied to the vacuum insulator on the main body side. In detail, the second plate member 20 and the first plate member 10 must be sealed to maintain the vacuum inside the vacuum insulator. In this case, since the two plate members have different temperatures, heat transfer may occur between them. A conductive resistance sheet 60 is provided to prevent heat conduction between two plate members of different types.

The conductive resistance sheet 60 may be provided as a sealing portion 61 that is sealed at both ends to define at least a part of a wall for the third space and maintain a vacuum state. The conductive resistance sheet 60 is provided as a micrometer thin plate in order to reduce the amount of heat conduction flowing along the wall of the third space. The sealing part 610 may be provided as a welding part. That is, the conductive resistance sheet 60 and the plate members 10 and 20 may be fused to each other. In order to induce a fusion action between each other, the conductive resistance sheet 60 and the plate members 10 and 20 may use the same material, and stainless steel may be used as the material. The sealing part 610 is not limited to a welding part and may be provided through a method such as caulking. The conductive resistance sheet 60 may be provided in a curved shape. Accordingly, the distance of heat conduction of the conductive resistance sheet 60 is provided longer than the linear distance of each plate member, so that the amount of heat conduction can be further reduced.

A temperature change occurs along the conductive resistance sheet 60 . Therefore, in order to block the heat transfer with the outside, it is preferable that the shielding part 62 is provided on the outside of the conductive resistance sheet 60 so that the heat insulating action occurs. In other words, in the case of a refrigerator, the second plate member 20 is at a high temperature and the first plate member 10 is at a low temperature. In addition, the conductive resistance sheet 60 undergoes heat conduction from a high temperature to a low temperature, and the temperature of the sheet changes abruptly along the heat flow. Therefore, when the conductive resistance sheet 60 is opened to the outside, heat transfer through the open place may occur severely. In order to reduce such heat loss, a shielding part 62 is provided on the outside of the conductive resistance sheet 60 . For example, even when the conductive resistance sheet 60 is exposed to either a low temperature space or a high temperature space, the conductive resistance sheet 60 does not perform the role of conductive resistance as much as the exposed amount, which is undesirable. do.

The shielding part 62 may be provided as a porous material in contact with the outer surface of the conductive resistance sheet 60, or may be provided as a heat insulating structure exemplified by a separate gasket placed on the outside of the conductive resistance sheet 60. , when the vacuum insulator on the main body side is closed with respect to the vacuum insulator on the door side, it may be provided as a part of the vacuum insulator provided at a position facing the corresponding conductive resistance sheet 60 . In order to reduce heat loss even when the body and the door are opened, it is preferable that the shielding part 62 is provided with a porous material or a separate heat insulating structure.

The conductive resistance sheet shown in FIG. 4B can be preferably applied to the door-side vacuum insulator, and the different parts will be described in detail with respect to FIG. 4A, and the same description will be applied to the same parts. A side frame 70 is further provided outside the conductive resistance sheet 60 . The side frame 70 may include parts for sealing the door and the body, an exhaust port necessary for an exhaust process, and a getter port for maintaining a vacuum. This is because, in the case of the vacuum insulator on the main body side, it may be convenient to install parts, but the position of the door side is limited.

In the case of the door-side vacuum insulator, it is difficult for the conductive resistance sheet 60 to be placed on the front end of the vacuum space, that is, on the side of the corner. This is because the corner edge portion of the door 3 is exposed to the outside unlike the body. In more detail, when the conductive resistance sheet 60 is placed on the front end of the vacuum space portion, the corner edge portion of the door 3 is exposed to the outside, so a separate heat insulating part must be constructed for the insulation of the conductive resistance sheet 60 Because there are disadvantages.

The conductive resistance sheet shown in FIG. 4C may be preferably installed in a pipe passing through the vacuum space, and different parts will be described in detail with respect to FIGS. 4A and 4B, and the same description will be applied to the same parts. The peripheral portion where the conduit 64 is provided may be provided in the same shape as that of FIG. 4A , and more preferably, a corrugated conductive resistance sheet 63 may be provided. According to this, the heat transfer path can be lengthened and deformation due to the pressure difference can be prevented. In addition, a separate shielding member for insulating the conductive resistance sheet may be provided.

A heat transfer path between the first plate member 10 and the second plate member 20 will be described with reference to FIG. 4A again. The heat passing through the vacuum insulator includes a surface of the vacuum insulator, more specifically, a surface conductive heat (①) transmitted along the conductive resistance sheet 60, and a supporting unit 30 provided inside the vacuum insulator. ) can be divided into supporter conduction heat (②), gas conduction heat through the internal gas of the vacuum space (③), and radiant transfer heat transferred through the vacuum space portion (④).

The transfer heat may be modified according to various design values. For example, the supporting unit can be changed so that the first and second plate members 10 and 20 can withstand the vacuum pressure without being deformed, the vacuum pressure can be changed, and the interval length of the plate members can be varied, The length of the conduction resistance unit may be changed, and may vary depending on how much the temperature difference between the spaces (the first space and the second space) provided by the plate member is made. In the case of the embodiment, a preferable configuration was found when considering that the total heat transfer amount is made smaller than the heat-insulating structure provided by foaming the conventional polyurethane. Here, the actual heat transfer coefficient in the conventional polyurethane foaming refrigerator may be presented as 19.6 mW/mK.

If the heat transfer amount of the vacuum insulator according to the embodiment is relatively analyzed, heat transfer by the gas conduction heat (③) can be made the smallest. For example, this can be controlled to less than 4% of the total heat transfer. Heat transfer by solid conduction heat, which is defined as the sum of the surface conduction heat (①) and the supporter conduction heat (②), is the largest. For example, it can reach 75%. The radiation transfer heat (③) is smaller than the solid conduction heat, but larger than the heat transfer by gas conduction heat. For example, the radiation transfer heat (③) may account for approximately 20% of the total heat transfer amount.

According to this heat transfer distribution, the effective heat transfer coefficient (eK) (W/mK) may have the order of Equation 1 when comparing the heat transfer heat (①②③④).

Here, the real heat transfer coefficient (eK) is a value that can be measured using the shape and temperature difference of the target article, and is a value that can be obtained by measuring the total heat transfer amount and the temperature of at least one part to which heat is transferred. For example, place a quantitatively measurable heating source in the refrigerator to know the amount of heat generated (W), measure the temperature distribution of the door for heat transmitted through the door body of the refrigerator and the edge of the door, respectively (K), and heat transfer The actual heat transfer coefficient can be obtained by confirming the path that becomes a converted value (m).

The actual heat transfer coefficient (eK) of the entire vacuum insulator is a value given by k = QL/AΔT, Q is the heat transfer amount (W), which can be obtained by using the calorific value of the heater, and A is the The cross-sectional area (m ² ), L is the thickness (m) of the vacuum insulator, ΔT can be defined as a temperature difference.

The surface conduction heat is the temperature difference (ΔT) at the entrance and exit of the conductive resistance sheet 60 and 63, the cross-sectional area of the conductive resistance sheet (A), the length of the conductive resistance sheet (L), and the thermal conductivity of the conductive resistance sheet (k) ( The thermal conductivity of the conductive resistance sheet can be found out in advance as the physical properties of the material) to find out the amount of conduction heat. The supporter conduction heat, the temperature difference (ΔT) at the entrance and exit of the supporting unit 30, the cross-sectional area (A) of the supporting unit, the length (L) of the supporting unit, the thermal conductivity of the supporting unit (k). . Here, the thermal conductivity of the supporting unit can be found in advance as a physical property value of the material. The sum of the gas conduction heat (③) and the radiation transfer heat (④) can be found by subtracting the surface conduction heat and the supporter conduction heat from the heat transfer amount of the entire vacuum insulator. The ratio of the gas conduction heat to the radiative transfer heat can be found out by finding the radiant transfer heat when the vacuum degree of the vacuum space is significantly lowered so that there is no gas conduction heat.

When the porous material is provided inside the vacuum space unit 50, the porous material conduction heat (⑤) can be considered as the sum of the supporter conduction heat (②) and radiant heat (④). The heat of conduction of the porous material may be changed by various variables such as the type and amount of the porous material.

_{According to the embodiment, the temperature difference (ΔT 1} ) between the geometric center formed by the adjacent bars 31 and the location where the bars are positioned is preferably provided to be less than 0.5°C. _{In addition, the temperature difference (ΔT 2} ) between the geometric center formed by the adjacent bars and the edge portion of the vacuum insulator may preferably be provided to be less than 5 degrees Celsius. In addition, in the second plate member, at a point where the heat transfer path passing through the conduction resistance sheets 60 and 63 meets the second plate member, the temperature difference with the average temperature of the second plate member may be greatest. have. For example, when the second space is a region that is hotter than the first space, the temperature at the point of the second plate member where the heat transfer path passing through the conductive resistance sheet meets the second plate member is the lowest. Similarly, when the second space is a region that is colder than the first space, the temperature becomes the highest at the point of the second plate member where the heat transfer path passing through the conductive resistance sheet meets the second plate member.

This means that the amount of heat transfer through other places except for the surface conduction heat passing through the conductive resistance sheet should be sufficiently controlled, and only when surface conduction heat occupies the largest heat transfer amount, the total amount of heat transfer satisfied by the vacuum insulator as a whole can be achieved. It means getting an advantage. To this end, the temperature change amount of the conductive resistance sheet may be controlled to be greater than the temperature change amount of the plate member.

Physical characteristics of each component providing the vacuum insulator will be described. In the vacuum insulator, a force by vacuum pressure is applied to all parts. Therefore, it is preferable to use a material having a certain level of strength (N/m ^{2 ).}

Under this background, it is preferable that the plate members 10 and 20 and the side frame 70 are made of a material having sufficient strength not to be damaged despite vacuum pressure. For example, when the number of bars 31 is reduced to limit supporter conduction heat, deformation of the plate member by vacuum pressure may occur, which may adversely affect the appearance. The radiation-resisting sheet 32 is preferably an article that can be easily processed into a thin film with low emissivity, and must have a degree of strength that is not deformed by external impact. The supporting unit 30 must be provided with strength to support the force by vacuum pressure and withstand external impact and have workability. The conductive resistance sheet 60 is preferably made of a thin plate-like material that can withstand vacuum pressure.

In an embodiment, the plate member, the side frame, and the conductive resistance sheet may be made of stainless steel having the same strength. The radiation resistance sheet may be made of aluminum having a weaker strength than stainless steel. The supporting unit may use a resin having a weaker strength than aluminum as its material.

Unlike the strength seen in terms of the material as described above, an analysis in terms of rigidity is required. The stiffness (N/m) is a property that is not easily deformed, and even if the same material is used, the stiffness may vary depending on the shape thereof. The conductive resistance sheets 60 and 63 may be made of a material with high strength, but it is preferable to increase the thermal resistance and to spread evenly without a rough surface when vacuum pressure is applied to minimize the radiated heat. The radiation resistance sheet 32 is required to have a certain level of rigidity in order not to touch other parts due to deformation. In particular, the edge portion of the radiation resistance sheet may sag according to its own weight to generate conductive heat. Therefore, a certain level of rigidity is required. The supporting unit 30 is required to be rigid enough to withstand the compressive stress and external impact from the plate member.

In the embodiment, it is preferable that the plate member and the side frame have the highest rigidity to prevent deformation due to vacuum pressure. Preferably, the supporting unit, particularly the bar, has the second greatest stiffness. The radiation resistance sheet is weaker than the supporting unit, but it is preferable to have rigidity than the conductive resistance sheet. Lastly, it is preferable that the conductive resistance sheet be easily deformed by vacuum pressure, so it is preferable to use a material with the lowest rigidity.

Even when the inside of the vacuum space 50 is filled with the porous material 33, it is preferable that the conductive resistance sheet have the lowest rigidity, and it is preferable that the plate member and the side frame have the highest rigidity.

Hereinafter, a vacuum pressure preferably suggested according to the internal state of the vacuum insulator will be described. As already described, the inside of the vacuum insulator must maintain a vacuum pressure to reduce heat transfer. In this case, it can be easily predicted that it is desirable to maintain a vacuum pressure as low as possible to reduce heat transfer.

The vacuum space may resist heat transfer only by the supporting unit 30, and the porous material 33 may be filled with the supporting unit in the vacuum space 50 to resist heat transfer, and the supporting unit may be It is also possible to resist heat transfer with a porous material without application.

A case in which only the supporting unit is provided will be described.

5 is a graph showing a change in thermal insulation performance and a change in gas conductivity according to vacuum pressure by applying a simulation.

5, the lower the vacuum pressure, that is, the higher the degree of vacuum, the higher the heat load in the case of only the body (graph 1) or when the body and the door are combined (graph 2), compared with the conventional polyurethane foamed article Therefore, it can be seen that the heat load is reduced and the thermal insulation performance is improved. However, it can be seen that the degree of improvement in the thermal insulation performance is gradually lowered. In addition, it can be seen that the lower the vacuum pressure, the lower the gas conductivity (graph 3). However, it can be seen that even if the vacuum pressure is lowered, the rate of improvement in the thermal insulation performance and the gas conductivity is gradually lowered. Therefore, it is desirable to lower the vacuum pressure as much as possible, but there are problems in that it takes a lot of time to obtain an excessive vacuum pressure, and costs are high due to the use of an excessive getter. In the embodiment, the optimum vacuum pressure is proposed from the above point of view.

6 is a graph for observing the process of evacuating the inside of the vacuum insulator with time and pressure when the supporting unit is used.

Referring to FIG. 6 , in order to create the vacuum space part 50 in a vacuum state, while heating (baking), the gas of the vacuum space part is exhausted by a vacuum pump while vaporizing the potential gas remaining in the parts of the vacuum space part. However, when the vacuum pressure exceeds a certain level, it reaches a point where the level of the vacuum pressure no longer increases (Δt ₁ ). After that, the connection of the vacuum space of the vacuum pump is disconnected and heat is applied to activate the getter (Δt ₂ ). When the getter is activated, the pressure in the vacuum space decreases for a certain period of time, but it is normalized and the vacuum pressure is maintained at a certain level. When the vacuum pressure is maintained at a certain level after activation of the getter, the vacuum pressure is approximately 1.8×10 ^-6 Torr.

^{In the embodiment, the lowest internal pressure of the vacuum space is 1.8×10 -6} Torr by setting the point at which the vacuum pressure is no longer substantially lowered even if the gas is exhausted by operating the vacuum pump as the lower limit of the vacuum pressure used in the vacuum insulator set to

7 is a graph comparing vacuum pressure and gas conductivity.

Referring to FIG. 7 , the actual heat transfer coefficient (eK) of the gas conductivity according to the vacuum pressure according to the size of the gap between the inside of the vacuum space part 50 is shown as a graph. The gap of the vacuum space part was measured in three cases of 2.76 mm, 6.5 mm, and 12.5 mm. The gap of the vacuum space is defined as follows. When there is the radiation resistance sheet 32 inside the vacuum space part, it is the distance between the radiation resistance sheet and an adjacent plate, and when there is no radiation resistance sheet inside the vacuum space part, the first plate member and the second plate member The distance between the two plate members.

The point at which the conventional response with the actual heat transfer coefficient 0.0196 W / mk to provide an insulating material by foaming a polyurethane, even when the size of the small gap 2.76mm 2.65 × 10 ^- could be seen that the ¹ Torr. On the other hand, true even if the pressure is low, the point at which the saturation effect of reducing the heat-insulating effect due to the gas conducted heat is approximately 4.5 × 10 ^- was confirmed that the point of ³ Torr. The 4.5×10 ^{- 3} Torr pressure can be determined as a point at which the effect of reducing the gas conduction heat is saturated. Also, when the real heat transfer coefficient is 0.1 W/mk, it is 1.2×10 ^-2 Torr.

When the supporting unit is not provided in the vacuum space and the porous material is provided, the size of the gap ranges from several micrometers to several hundreds of micrometers. In this case, even when the vacuum pressure is relatively high due to the porous material, that is, even when the degree of vacuum is low, radiant heat transfer is small. Therefore, an appropriate vacuum pump suitable for the vacuum pressure is used. The appropriate vacuum pressure for the corresponding vacuum pump is approximately 2.0×10 ^{- 4} Torr. In addition, the vacuum pressure at which the effect of reducing gas is conducted heat saturation is approximately 4.7 × 10 ^- is ² Torr. In addition, the pressure at which the reduction effect of gas conduction heat reaches the conventional real heat transfer coefficient of 0.0196 W/mk is 730 Torr.

When the supporting unit and the porous material are provided together in the vacuum space, a vacuum pressure intermediate between the case of using only the supporting unit and the case of using only the porous material may be used. When only the porous material is used, the lowest vacuum pressure can be created and used.

The vacuum insulator includes a first plate member defining at least a portion of a wall for the first space, and a second plate member defining at least a portion of a wall for a second space different in temperature from the first space. can do. The first plate member may include a plurality of layers. The second plate member may include a plurality of layers.

The vacuum insulator seals the first plate member and the second plate member so as to provide a third space that is a space between the temperature of the first space and the temperature of the second space and is a space in a vacuum state. It may further include a sealing unit.

Meanwhile, when any one of the first plate member and the second plate member is located in the inner space of the third space, the plate member may be expressed as an inner plate member. When the other one of the first plate member and the second plate member is located in an outer space of the third space, the plate member may be expressed as an outer plate member. For example, the inner space of the third space may be a storage room of the refrigerator. The outer space of the third space may be an outer space of the refrigerator.

The vacuum insulator may further include a supporting unit for maintaining the third space.

The vacuum insulator may further include a conductive resistance sheet connecting the first plate member and the second plate member to each other in order to reduce the amount of heat transfer between the first plate member and the second plate member.

At least a portion of the conductive resistance sheet may be disposed to face the third space. The conductive resistance sheet may be disposed between an edge of the first plate member and an edge of the second plate member. The conductive resistance sheet may be disposed between a surface of the first plate member facing the first space and a surface of the second plate member facing the second space. The conduction resistance sheet may be disposed between a side portion of the first plate member and a side portion of the second plate member.

At least a portion of the conductive resistance sheet may be formed to extend in substantially the same direction as the extending direction of the first plate member.

A thickness of the conductive resistance sheet may be thinner than at least one of the first plate member and the second plate member. As the thickness of the conductive resistance sheet decreases, heat transfer between the first plate member and the second plate member may be further reduced.

As the conductive resistance sheet is thinner, there is an advantage in that heat transfer can be reduced, but it may be difficult to couple the conductive resistance sheet between the first plate member and the second plate member.

One end of the conductive resistance sheet may be disposed to overlap at least a portion of the first plate member. This is to provide a space for coupling one end of the conductive resistance sheet and the first plate member. Here, the coupling method may include welding.

The other end of the conductive resistance sheet may be disposed to overlap at least a portion of the second plate member. This is to provide a space for coupling the other end of the conductive resistance sheet and the second plate member. Here, the coupling method may include welding.

As another embodiment replacing the conductive resistance sheet, the conductive resistance sheet may be deleted, and the thickness of one of the first plate member and the second plate member may be thinner than the other. In this case, the thickness of any one of the above may be thicker than the conductive resistance sheet. In this case, the length of any one of the above may be longer than the length of the conductive resistance sheet. This configuration can reduce the increase in heat transfer by eliminating the conductive resistance sheet. Also, this configuration can reduce the difficulty in coupling the first plate member and the second plate member.

At least a portion of the first plate member and at least a portion of the second plate member may be disposed to overlap each other. This is to provide a space for coupling the first plate member and the second plate member. An additional cover may be disposed on any one of the first plate member and the second plate member having a thin thickness. This is to protect the thinned plate member.

The vacuum insulator may further include an exhaust port for discharging the gas in the vacuum space.

The vacuum insulator may further include a decor positioned on the outside of the conductive resistance sheet.

Here, the decoration may be represented by a sealing frame 200 in FIGS. 8 to 24 . The decoration may be represented by the cover assembly 400 described in FIGS. 25 to 45 .

8 is a cross-sectional perspective view of the rim of the vacuum insulator.

Referring to FIG. 8 , a first plate member 10 , a second plate member 20 , and a conductive resistance sheet 60 are provided. The conduction resistance sheet 60 may be provided as a thin plate to resist heat conduction between the plate members 10 and 20 . The conductive resistance sheet 60 is provided as a thin plate in a flat plane in the drawing, but when a vacuum is applied to the vacuum space part 50, it may be pulled inward to have a curved shape.

The conductive resistance sheet 60 is a thin plate and has low strength, so it can be damaged even by a small external impact, and when the conductive resistance sheet 60 is damaged, the vacuum in the vacuum space is destroyed and the performance of the vacuum insulator is not exhibited. can not do it. In order to improve this problem, a sealing frame 200 may be provided on the outer surface of the conductive resistance sheet 60 . According to the sealing frame 200, the parts of the door 3 or other external articles do not directly contact the conductive resistance sheet 60, but indirectly contact through the sealing frame 200, so conduction resistance It is possible to prevent damage to the sheet 60 . In order for the sealing frame 200 not to transmit an impact to the conduction resistance sheet 60, the distance between the two members may be spaced apart from each other, and a buffer member may be interposed therebetween.

In order to reinforce the strength of the vacuum insulator, a reinforcing member may be provided on the plate members 10 and 20 . For example, in the reinforcing member, a first reinforcing member 100 is fastened to the edge of the second plate member 10 , and a second reinforcing member 110 is fastened to the edge of the first plate member 10 . ) may be included. The reinforcing members 100 and 110 may be thicker or stronger than the plate members 10 and 20 to the extent that the strength of the vacuum insulator can be increased. The first reinforcing member 100 may be provided in the inner space of the vacuum space portion 50 , and the second reinforcing member 110 may be provided in the inner surface of the main body 2 .

It is preferable that the conductive resistance sheet 60 does not come into contact with the reinforcing members 100 and 110 . This is because the heat conduction resistance characteristic generated in the conduction resistance sheet 60 is destroyed by the reinforcing member. In other words, the width of a narrow thermal bridge (heat bridge) for resisting heat conduction is greatly expanded by the reinforcing member, and the narrow thermal bridge characteristic is destroyed.

Since the width of the inner space of the vacuum space portion 50 is narrow, the first reinforcing member 100 may be provided in a flat cross-section. The second reinforcing member 110 provided on the inner surface of the main body 2 may be provided in a shape in which a cross-section is bent.

The sealing frame 200 is placed in the inner space of the main body 2, the inner surface portion 230 supported by the first plate member 10, the second plate member placed in the outer space of the main body (2) The outer surface portion 210 supported by the 20, and the vacuum insulator forming the main body 2 are placed on the edge side to cover the conduction resistance sheet 60, and the inner surface portion 230 and the outer surface portion 210 ) may include a side portion 220 for connecting them.

The sealing frame 200 may be made of a resin that is slightly deformable. The sealing frame 200, the mounting position may be maintained by the interaction between the inner surface portion 230 and the outer surface portion 210, that is, a gripping action. In other words, the setting position may not be deviated.

The fixing of the position of the sealing frame 200 will be described in detail.

First, the movement of the plate members 10 and 20 in the extending direction on the plane (the y-axis direction in FIG. 8 ) is carried out by the inner surface 230 being caught and supported by the second reinforcing member 110 . can be fixed. In more detail, the movement of the sealing frame 200 to the outside from the vacuum insulator may be hindered by the inner surface 230 being caught by the second reinforcing member 110 . Conversely, the movement of the sealing frame 200 to the inside of the vacuum insulator is an action in which the inner surface part 230 is caught and supported by the second reinforcing member 110 (this action is a sealing provided by resin). It can act in both directions including the elastic restoring force of the pry), secondly, the side part 220 stops with respect to the plate members 10 and 20, and thirdly, the inner surface part 230 is the first plate member ( 10), any action of blocking the movement in the y-axis direction may be hindered by at least one action.

The movement in the vertical extension direction (x-axis direction in FIG. 8 ) with respect to the cross section of the plate members 10 and 20 is fixed by the outer surface portion 210 being caught and supported by the second plate member 20 . can be As an auxiliary action, the movement in the x-axis direction may be hindered by the action of the inner surface 230 grabbing and contacting the second reinforcing member 110 .

The movement in the extending direction (z-axis direction in FIG. 8) of the sealing frame 200 is such that the inner surface 230 of any one sealing frame 200 is in contact with the inner surface of the adjacent other sealing frame 200. The first action and the inner portion 230 of any one of the sealing frames 200 may be stopped by at least one of the second action in contact with the mullion 300 .

9 and 10 are views schematically showing the front of the main body, in the drawing, the sealing frame 200, it is noted that the inner surface part 230 represents a virtual state in which the side surface part 220 is spread in a parallel direction. shall.

9 and 10 , the sealing frame 200 may include members 200b and 200e for sealing the upper and lower edges of the main body 2 , respectively. The side edge of the main body 2 can be divided according to whether each inner space divided based on the mullion 300 is sealed separately (in the case of FIG. 9) or integrally (in the case of FIG. 10). have.

In the case of sealing the side edge of the main body 2 by separating as shown in FIG. 9, it may be divided into four sealing frames 200a, 200c, 200d, and 200f. In the case of sealing the side edge of the body 2 integrally as shown in FIG. 10 , it may be divided into two sealing frames 200g and 200c.

In the case of sealing the side edge of the main body 2 with two sealing frames 200g and 200c as shown in FIG. 10, it is convenient to manufacture because two fastening operations are required, but the storage space separated by the heat conduction of the sealing frame There is a risk of loss of cold air due to heat transfer between the livers, so it is necessary to respond to this.

In the case of sealing the side edge of the main body 2 with four sealing frames 200a, 200c, 200d, and 200f as shown in FIG. 9, since four fastening operations are required, manufacturing is inconvenient, but between the sealing frames There is an advantage of reducing the loss of cold air as heat transfer between the separated storages is reduced by interfering with the heat conduction.

On the other hand, the embodiment of the vacuum insulator shown in FIG. 8 may preferably illustrate the vacuum insulator on the main body side. However, it does not exclude that it is provided in the door-side vacuum insulator. However, since the gasket is generally installed in the door 3, it is more preferable that the sealing frame 200 is provided in the vacuum insulator on the main body side. In this case, the side portion 220 of the sealing frame 200 can further obtain the advantage of providing a width sufficient to contact the gasket.

In detail, since the thickness of the vacuum insulator, that is, the width of the side part 220 is wider than the width of the vacuum insulator, the insulating width of the gasket can be sufficiently wide. For example, when the insulation thickness of the vacuum insulator is 10 mm, there is an advantage in that the storage space in the refrigerator can be enlarged by providing a large storage space in the refrigerator. However, 10 mm has a problem in that it does not provide a sufficient gap in contact with the gasket. In this case, since the side part 220 can provide a wide gap corresponding to the contact area of the gasket, it is possible to effectively prevent loss of cold air through the contact gap between the main body 2 and the door 3 . have. That is, when the contact width of the gasket is 20 mm, the width of the side portion 220 can be provided to be 20 mm or more in correspondence with the contact width of the gasket, even if the insulating thickness of the vacuum end body is 10 mm.

It can be understood that the shielding of the conductive resistance sheet and the sealing to prevent cold air loss are performed by the sealing frame 200 .

Fig. 11 is a cross-sectional view of the contact portion shown in a state in which the body is closed by the door.

Referring to FIG. 11 , the gasket 80 is interposed between the body 2 and the door 3 . The gasket 80 may be fastened to the door 3 and may be provided as a deformable member as a soft material. The gasket 80 includes a magnet as a part, and when the magnet pulls a magnetic material (ie, the magnetic material of the body rim portion) and approaches, the gasket 80 is gently deformed by the action of the main body 2 and the door 3 ) can be blocked from leakage of cold air in the refrigerator by a sealing surface having a predetermined width.

Specifically, when the gasket sealing surface 81 of the gasket is in contact with the side portion 220, it is possible to provide the side sealing surface 221 of sufficient width. The side sealing surface 221 may be defined as a contact surface on the side portion 220 that is in contact with the gasket sealing surface 81 when the gasket 80 is in contact with the side portion 220 .

According to this, it is possible to secure the sealing surfaces 81 and 221 of sufficient area regardless of the insulation thickness of the vacuum insulator. Because, even if the insulation thickness of the vacuum insulator is narrow, for example, even if the insulation thickness of the vacuum insulator is narrower than the gasket sealing surface 81, if the width of the side portion 220 is increased, the side sealing surface 221 of sufficient width can get In addition, it is possible to secure the sealing surfaces 81 and 221 of sufficient area regardless of the deformation of the member that may affect the deformation of the contact surface between the body and the door. Because, in designing the side part 220, a predetermined clearance can be provided in and out of the side sealing surface 221, so even if a slight deviation between the sealing surfaces 81 and 221 occurs, the sealing surface This is because the width and area can be maintained.

The sealing frame 200 may be provided with the outer surface portion 210 , the side surface portion 220 , and the inner surface portion 230 to maintain a set position thereof. Simply, the outer surface portion 210 and the inner surface portion 230 have a concave shape, that is, have a concave groove structure to hold the end of the self-vacuum insulator, more precisely, the plate members 10 and 20 can be provided as Here, the concave groove may be understood as having a configuration of the concave groove as a configuration in which the width between the ends of the outer surface portion 210 and the inner surface portion 230 is smaller than the width of the side portion 220 .

The fastening of the sealing frame 200 will be briefly described. First, in a state in which the inner surface portion 230 is caught on the second reinforcing member 110 , the side surface portion 220 and the outer surface portion 210 are rotated in the direction of the second plate member 20 . Then, the sealing frame 200 is elastically deformed, and the outer surface portion 210 moves inward along the outer surface of the second plate member 20 to complete the fastening. When the coupling of the sealing frame 200 is completed, the sealing frame 200 may be restored to an original shape designed before deformation. When the fastening is completed, the installation position may be maintained as described above.

A detailed configuration and detailed operation of the sealing frame 200 will be described.

In the outer surface portion 210 , an outer surface extension 211 extending inward from the end of the second plate member 20 , and an outer surface of the second plate member 20 at the end of the outer extension portion 211 . An external contact portion 212 that abuts may be provided.

The outer extension portion 211 has a predetermined length, which is to have a predetermined length in order to prevent the outer surface portion 210 from falling out due to a weak external action force. In other words, even if the outer surface portion 210 receives a pulling force toward the door due to the user's carelessness, the outer surface portion 210 is not completely removed from the second plate member 20 . However, if it is too long, it is difficult to intentionally remove it during repair, and since the fastening operation becomes difficult, it is preferable to be limited to a predetermined length.

The outer contact portion 212 may have a structure in which an end of the outer extension portion 211 is slightly bent toward the outer surface of the second plate member 20 . Accordingly, since the sealing by the contact between the outer surface portion 210 and the second plate member 20 is perfected, it is possible to prevent the inflow of foreign substances.

The side portion 220 is bent from the outer surface portion 210 toward the opening of the body 2 by approximately 90 degrees, and is provided with a width sufficient to secure a sufficient width of the side sealing surface 221 . The side portion 220 may be provided thinner than the inner surface portion 210 and the outer surface portion 230 . This has the purpose of allowing elastic deformation when the sealing frame 200 is fastened or removed, and the purpose of not allowing a distance that causes a weakening of magnetic force between the magnet installed in the gasket 80 and the magnetic body on the body side. have. The side part 220 may have the purpose of protecting the conductive resistance sheet 60 and arranging the exterior as an external exposed part. When a heat insulating member is installed inside the side part 220 , the insulating performance of the conductive resistance sheet 60 may be reinforced.

The inner surface portion 230 is bent from the side portion 220 in the inner direction of the cabinet, that is, in the rear direction of the main body by bending approximately 90 degrees to extend. The inner surface portion 230 performs an action of fixing the sealing frame 200, an action of installing parts necessary for the operation of a product on which a vacuum insulator is installed, such as a refrigerator, and an action of preventing the inflow of foreign substances into the interior. can

An operation corresponding to each configuration of the inner surface portion 230 will be described.

On the inner surface portion 230, an inner extension portion 231 extending by bending from the inner end of the side portion 220, and an outward direction from the inner end of the inner extension portion 231, that is, a first plate member ( 10) A first member fastening portion 232 bent toward the inner surface is provided. The first member fastening part 232 may contact and engage the protrusion 112 of the second reinforcing member 110 . The inner extension part 231 may provide a gap extending toward the inner side of the cabinet so that the first member fastening part 232 is caught inside the second reinforcing member 110 .

As the first member fastening part 232 is fastened to the second reinforcing member 110 , a supporting action of the sealing frame 200 may be derived. The second reinforcing member 110 may further include a base portion 111 fastened to the first plate member 10 and a protrusion 112 bent and extended from the base portion 111 . Due to the structure of the base part 111 and the protrusion part 112 , the moment of inertia of the second reinforcing member 110 increases, thereby increasing the ability to resist bending strength.

A second member fastening part 233 may be fastened to the first member fastening part 232. The first and second member fastening parts 232 and 233 may be provided as separate members fastened to each other, It may be provided as a single member from the time of design.

A gap forming portion 234 that further extends inwardly from the inner end of the second member fastening portion 233 may be further provided. The gap forming part 234 may act as a part providing a space or space in which parts necessary for operation of a device such as a refrigerator provided with a vacuum insulator are placed.

An inward inclined portion 235 is further provided inside the gap forming portion 234 . The inclination portion 235 in the cabinet may be provided to be inclined to approach the first plate member 10 toward the end, that is, toward the inside of the cabinet. The inclination part 235 in the cabinet is provided so that the distance between the sealing frame and the first plate member becomes smaller as it goes inward, so that the volume occupied by the sealing frame 200 is made as small as possible while the space forming part 234 is reduced as much as possible. ), the effect of securing a space where parts such as lamps are installed can be expected.

A contact portion 236 is provided at an inner end of the inclination portion 235 in the refrigerator. The inner contact portion 236 may have a structure in which an end of the outer inclined portion 235 is slightly bent toward the inner surface of the first plate member 10 . According to this, the sealing by the contact between the inner surface part 230 and the first plate member 10 is perfected, thereby preventing the inflow of foreign substances and the like.

When an accessory such as a lamp is installed on the inner surface 230 , the inner surface 230 may be divided into two parts in order to achieve a purpose such as for convenience in installation of the part. For example, a first member providing the inner extension part 231 and the first member fastening part 232 , the second member fastening part 233 , the gap forming part 234 , and the inner inclination It may be divided into a portion 235 and a second member providing the contact portion 236 in the refrigerator. The first member and the second member are fastened in such a way that the second member fastening part 233 is fastened to the first member fastening part 232 in a state where an article exemplified by a lamp is mounted on the second member. can be Of course, it does not exclude that the inner surface portion 230 is provided in more various ways. For example, the inner surface portion 230 may be provided as a single member.

12 is a cross-sectional view of a contact portion between a body and a door according to another embodiment. This embodiment is characteristically different in the position of the conductive resistance sheet and the change of other parts accordingly.

Referring to FIG. 12 , in the present embodiment, the conductive resistance sheet 60 may be provided inside the refrigerator rather than at the edge of the vacuum insulator. The second plate member 20 may extend beyond the outside of the high cabinet and the edge of the vacuum insulator. In some cases, it may be extended a certain length to the inner side of the cabinet. In the case of this embodiment, it can be seen that the conduction resistance sheet can be provided at a position similar to the conduction resistance sheet of the vacuum insulator on the door side shown in FIG. 4B.

In this case, in order not to affect the high thermal conductivity and insulating performance of the conductive resistance sheet 60, it is preferable that the second reinforcing member 110 is moved inside the refrigerator without contacting the conductive resistance sheet 60. Do. This is to achieve the function of the heat bridge of the conductive resistance sheet. Accordingly, the conductive resistance sheet 60 and the second reinforcing member 110 are not in contact, and the conductive insulation performance by the conductive resistance sheet and the strength reinforcing performance of the vacuum insulator by the reinforcing member can be achieved together.

This embodiment can be applied when perfect thermal and physical protection for the edge portion of the vacuum insulator is required.

13 and 14 are partially cut-away perspective views for explaining the fastening of the two members in an embodiment in which the inner surface is divided into two members, FIG. 13 is a state in which the fastening is completed, and FIG. 14 is a view showing the fastening process.

13 and 14 , the first member fastening part 232 is caught on the protrusion 112 of the second reinforcing member 110 , and the outer surface part 210 is supported on the second plate member 20 . . Accordingly, the sealing frame 200 may be fixed to the edge portion of the vacuum insulator.

At least one first member insertion part 237 bent and extended in the inner direction of the first member fastening part 232 is provided at the end of the first member fastening part 232 , and preferably, at least one or more first member insertion parts 237 are provided at the end of each sealing frame 200 installed in the refrigerator. may be provided each. A second member insertion recess 238 may be provided at a position corresponding to the first member insertion part 237 . The first member inserting part 237 and the second member inserting recess 238 have similar sizes and shapes to each other, so that the first member inserting part 237 is inserted into the second member inserting recess 238 and It can be fitted and fixed.

The fastening of the said 1st member and the said 2nd member is demonstrated. In a state in which the first member is fastened to the edge of the vacuum insulator, the second member is aligned with the first member so that the second member insertion recess 238 corresponds to the first member insertion part 237 . . When the first member insertion part 237 is inserted into the second member insertion recess 238 , the two members may be fastened.

Meanwhile, in order to prevent the fastened second member from being detached from the first member, at least a portion of the second member insertion recess 238 may be smaller than that of the first member insertion portion 237 . Thereby, both members can be press-fitted. After the second member insertion recess 238 and the first member insertion part 237 are inserted to a predetermined depth, protrusions and grooves are formed on both members, respectively, at any point after the predetermined depth so that they can perform the function of being caught and supported. may be provided. In this case, after the two members are inserted to a certain depth, they may be further inserted beyond the chin so that the fixing of the two members may be performed more firmly. Of course, the operator can feel that it has been correctly inserted through the light feeling.

The two members constituting the inner surface may have a fixed position and a coupling relationship by a configuration that is fitted and coupled in this way. As another method, when the loading load is large due to the action of the second member fixing separate components, the first member and the second member are connected by a separate fastening member such as an in-house fastener 239 . They may be connected to each other.

15 is a view sequentially explaining the fastening of the sealing frame in the case of the embodiment in which the sealing frame is provided with two members. In particular, a case in which the component is installed on the inner surface is illustrated.

Referring to Figure 15 (a), the sealing frame 200 is fastened to the edge portion of the vacuum insulator. At this time, the fastening may be performed by using elastic deformation of the sealing frame 200 and a restoring force corresponding thereto, without a separate member such as a screw.

For example, in a state in which the inner surface portion 230 is caught on the second reinforcing member 110 , the connection point between the inner surface portion 230 and the side portion 220 is a rotation center, and the side portion 220 is and the outer surface portion 210 is rotated in the direction of the second plate member 20 . This action may cause elastic deformation of the side portion 220 .

Thereafter, the outer surface portion 210 moves inward from the outer surface of the second plate member 20 and the elastic restoring force of the side portion 220 acts so that the outer surface portion 210 is formed by the second plate member 20 . It can be lightly fastened to the outer surface of the When the coupling of the sealing frame 200 is completed, the sealing frame 200 may be positioned in an original position designed in the originally designed shape.

Referring to Figure 15 (b), the first member of the sealing frame 200 shows a state in which the fastening is completed. In order to enable the sealing frame 200 to be fastened to the edge of the vacuum insulator by the elastic deformation and elastic restoration action of the sealing frame, the side part 220 is the outer surface part 210 and the inner surface part 230. It may be formed thinner than

Referring to FIG. 15( c ), as the second member providing the inner surface 230 , the component seating member 250 is provided as a separate component. The component seating member 250 is a component on which the component 399 is placed and its setting position can be supported, and an additional function necessary for the operation of the component 399 may be further performed. For example, when the component 399 is a lamp in the present embodiment, the gap forming part 234 may be provided as a transparent member on the component mounting member 250 . Accordingly, the light irradiated from the lamp passes through the inner surface 230 and is irradiated into the cabinet, and the user can identify the articles in the cabinet.

In order to seat the component 399 on the component mounting member 250 , it may have a predetermined shape that can be fitted with the component 399 so that the position of the component 399 is fixed.

FIG. 15( d ) shows a state in which the component 399 is placed on the component mounting member 250 .

Referring to FIG. 15E , the component mounting member 250 on which the component 399 is seated is aligned in a predetermined direction so as to be fastened to the first member providing the inner surface portion. In the embodiment, the first member fastening part 232 and the second member inserting recess 238 extend to each other so that the first member fastening part 232 can be fitted into the second member inserting recess 238 . direction can be aligned. Of course, the present invention is not limited in this way, but may be preferably proposed in order to improve the convenience of assembly.

In order to force-fit the first member fastening part 232 and the second member inserting recess 238 , the first member fastening part 232 is slightly larger than the second member inserting recess 238 . It may be provided, and a locking structure such as a step and a protrusion may be introduced for light insertion.

Referring to FIG. 15(f) , the inner surface of the assembled state can be seen.

16 and 17 are views showing one end of the sealing frame. FIG. 16 is a view before the door hinge is installed, and FIG. 17 is a view in a state in which the door hinge is installed.

In the case of a refrigerator, a door hinge is provided at the connection part so that the door-side vacuum insulator is rotatably fastened to the main body-side vacuum insulator. The door hinge should not only have a predetermined strength by itself, but also prevent deflection of the door due to its own weight in a state in which the door is fastened and prevent distortion of the body.

Referring to FIG. 16 , a door fastener 260 is provided in the vacuum insulator on the main body side so that the door hinge 263 is fastened. Three door fasteners 260 may be provided. The door fastener 260 is further provided on the second plate member 20 and/or the reinforcing members 100 and 110 and/or a separate additional reinforcing member (eg, on the outer surface of the second plate member) may be fixed directly or indirectly to additional plates). Here, direct may refer to a method using a fusion method such as welding, and indirect may refer to a fastening method using an auxiliary fastening tool, not a method such as fusion.

The door fastener 260 may be fastened in contact with the second plate member 20 because high support strength is required. To this end, the sealing frame 200 may be cut, and the cut-out sealing frame 200 may be the upper sealing frame 200b of the upper edge of the vacuum insulator on the main body side. In addition, there may be right sealing frames 200a, 200f, and 200g of the right edge of the vacuum insulator on the main body side, and the lower sealing frame 200e of the lower edge of the vacuum insulator on the body side. If the door installation direction is different, it may be the left sealing frame 200a, 200f, or 200g of the left edge of the vacuum insulator on the main body side.

The cut-out sealing frame 200 may have a cut surface 261 , and the second plate member 20 may have a door fastener seating surface 262 to which the door fastener 260 is fastened. Accordingly, the door fastener seating surface 262 may be exposed outside by the incision of the sealing frame 200 , and an additional plate member may be further interposed in the door fastener seating surface 262 .

As provided in the drawings, the end of the sealing frame 200 may not be removed as a whole, but a portion of the sealing frame 200 may be removed only at a portion where the door fastener 260 is provided. However, it may be more preferable that the ends of the sealing frame 200 are all removed so that the door hinge 263 for convenience of manufacture is firmly fastened in contact with the vacuum insulator.

18 is a view explaining the effect of the sealing frame according to the present invention in comparison with the prior art, and FIG. 18 (a) is a cross-sectional view of the contact part between the vacuum insulator and the door on the body side according to the present invention, FIG. 18 (b) ) is a cross-sectional view of the body and the door according to the prior art.

Referring to FIG. 18 , in the refrigerator, a hotline may be installed at the contact portion between the door and the body to prevent dew formation due to a sudden temperature change. The closer the hotline is to the outer surface and rim of the body, the less dew condensation can be removed with a small heat capacity.

According to the embodiment, the hotline 270 may be placed in the inner space of the gap between the second plate member 20 and the sealing frame 200 . A hotline accommodating part 271 on which the hotline 270 is placed may be further provided in the sealing frame 200 . Since the hotline 270 is placed outside the conductive resistance sheet 60, the amount of heat transferred into the furnace is also small. This makes it possible to prevent dew formation on the body and door contact parts even with a smaller heat capacity. In addition, by allowing the hotline 270 to be placed on a relatively high outer side, that is, at a portion bent between the main body rim and the outer surface of the main body, the intrusion of heat into the inner space can be prevented.

In the embodiment, the side portion 220 of the sealing frame 200 is not aligned with the portion w1 aligned with the gasket 80 and the vacuum space 50 , and the vacuum space 50 . It may have a gasket 80 and a portion w2 aligned with the inner space. This is a part provided by the side part 220 in order to secure sufficient cold air blocking by the magnet. Accordingly, the sealing action by the gasket 80 by the sealing frame 200 can be sufficiently achieved.

In the embodiment, the inclination portion 235 is provided to be inclined toward the inner surface of the first plate member 10 at a predetermined angle β. This can give the effect of increasing the volume of the inside of the box like the hatched part, so that the narrow inside space can be used more widely. In other words, as in the prior art, the space near the door can be widely utilized by inclining in the opposite direction to the predetermined angle α toward the interior space. For example, more food may be accommodated in the door, and more space may be obtained for accommodating various parts necessary for the operation of the device.

The following FIGS. 19 to 24 show various embodiments in which the sealing frame 200 is installed.

Referring to FIG. 19 , the second reinforcing member 110 may provide only the base 111 and not the protrusion 112 . In this case, a groove 275 may be provided in the base part 111 . An end of the first member fastening part 232 may be inserted into the groove 275 . This embodiment can be preferably applied to an article that can provide sufficient strength even if the protrusion 112 is not provided on the second reinforcing member 110 .

In the case of this embodiment, as a process of aligning the end of the first member fastening part 232 by inserting it into the groove 275 when the sealing frame 200 is fastened, the sealing frame 200 is positioned at the end of the vacuum insulator. can be contracted.

According to the fastening action of the groove 275 and the first member fastening part 232 , the sealing frame 200 is only fastened with the inner surface 230 of the sealing frame 200 and the second reinforcing member 110 . movement in the y-axis direction can be stopped.

Referring to FIG. 20 , the present embodiment is different from the embodiment shown in FIG. 19 in that the base part 111 is further provided with a reinforcing base part 276 . A groove 277 may be further provided in the reinforcing base portion 276 to allow the end of the first member fastening portion 232 to be inserted. Although the protrusion 112 is not provided on the second reinforcing member 110 due to a lack of an actual installation space or interference, the present embodiment may be applied when there is a need to reinforce the strength to a predetermined level. In other words, the level of strength reinforcement obtainable by further installing the reinforcement base 276 at the outer end of the base portion 111, preferably applied when the strength reinforcement effect of the vacuum insulator on the main body side can be provided. can

A groove 277 is provided in the reinforcing base part 276, and the end of the first member fastening part 232 is inserted into the groove 277 to align, and the sealing frame 200 is a vacuum insulator. may be fastened to the end of the

Even according to the fastening action of the groove 277 and the first member fastening part 232 , the sealing frame 200 is only fastened to the inner surface 230 of the sealing frame 200 and the second reinforcing member 110 . ) in the y-axis direction can be stopped.

Referring to FIG. 21 , the present embodiment differs from the embodiment shown in FIG. 19 in that it further provides a reinforcing protrusion 278 on the base part 111 . The end of the first member fastening part 232 may be caught by the reinforcing protrusion 278 . In this embodiment, even if the protrusion 112 or the reinforcing base 276 is not provided on the second reinforcing member 110 due to lack of actual space or interference, the second reinforcing member 110 reinforces the strength to a predetermined level and at the same time It can be applied when there is a need to make the one-member fastening part 232 engage. In other words, by further installing the reinforcing protrusion 278 at the outer end of the base portion 111, the strength reinforcing effect of the vacuum insulator on the main body side can be obtained. In addition, the reinforcing protrusion 278 can be preferably applied because it can provide a locking action of the first member fastening part 232 .

The sealing frame 200 may be fastened to the end of the vacuum insulator by being supported by the first member fastening part 232 being caught on the reinforcing protrusion 278 .

19 to 21 illustrate a case in which the inner surface portion 230 is provided as a single article without being separated into a first member and a second member and is fastened to a vacuum insulator. However, the present invention is not limited thereto and may be separated into two members.

Although the above embodiment presents a case in which the second reinforcing member 110 is provided, the following embodiment shows the sealing frame 200 when a separate reinforcing member is not provided inside the first plate member 10 . This engagement will be described.

Referring to FIG. 22 , the first reinforcing member 100 is provided to reinforce the strength of the vacuum insulator, but the second reinforcing member 110 is not provided separately. In this case, an inner protrusion 281 may be provided on the inner surface of the first plate member 10 so that the sealing frame 200 is fastened. The inner protrusion 281 may be fastened to the first plate member 10 by welding or fitting. In this embodiment, sufficient strength of the vacuum insulator on the main body side can be obtained only with the first reinforcing member 100 , that is, the reinforcing member provided inside the vacuum space 50 , or the second plate member 20 is reinforced on the side. It can be applied when the member can be installed.

A first member fastening groove 282 may be provided in the first member fastening part 232 in order to be fitted and fixed to the inner protrusion 281 . A fastening position of the sealing frame 200 may be fixed by inserting the inner protrusion 281 .

Referring to FIG. 23 , compared with the embodiment shown in FIG. 22 , the first member fastening groove 282 is not provided, which is characteristically different. According to the present embodiment, one end of the first member fastening part 232 is supported by the inner protrusion 281 , so that the position of the sealing frame 200 may be supported.

In this embodiment, compared with the embodiment shown in FIG. 22 , the movement in the y-axis direction of the sealing frame 200 is stopped in both directions by the inner protrusion 281 and the first member fastening groove 282 . Instead, there is a disadvantage in that only movement in one direction can be stopped. However, the advantage that the operator can work conveniently during the fastening operation of the sealing frame 200 can be expected.

19 to 23 , the first plate member 10 side is fixed, and the second plate member 20 side is provided in a configuration in which movement such as a slide light is allowed. In other words, relative sliding of the second plate member 20 and the outer surface portion 210 is permitted, and the relative movement of the first plate member 10 and the inner surface portion 230 is not permitted. . Such a configuration may be configured opposite to each other. Hereinafter, such a configuration is proposed.

Referring to FIG. 24 , an outer protrusion 283 may be provided on an outer surface of the second plate member 20 , and an outer engaging portion 213 may be provided on the outer surface portion 210 of the sealing frame 200 . can The outer locking part 213 may be supported by being caught by the outer protrusion 283 .

In the case of this embodiment, the inner surface 230 of the sealing frame 200 may allow movement such as a slide with respect to the inner surface of the first plate member 10 . In this embodiment, the mounting and fixing of the sealing frame 200 is different only in the direction and the same description can be applied.

In addition to the embodiment related to FIG. 24, various embodiments may be further proposed. For example, reinforcing members 100 and 110 may be further installed on the second plate member 20 , and various structures of FIGS. 19 to 21 may be provided for the reinforcing member. In addition, the outer locking part 213 may also be provided as a groove structure as shown in FIG. 22 .

In the above embodiment, the sealing frame 200 is provided in a configuration that is fastened to the edge of the vacuum insulator by using a resin as a material. When the sealing frame can have sufficient strength and thickness, it can act as protection of sufficient strength reinforcement. However, due to the characteristics of the resin material, deterioration of the product over a long period of time, damage during handling, and intervention of the resin material, a decrease in adhesion between the door magnet and the refrigerator body may occur.

Examples for solving these problems are presented below.

In the following embodiment, since the member corresponding to the sealing frame 200 is provided in a form in which at least two separate parts are fastened, it is divided into a cover assembly and named.

25 is a cutaway perspective view of a contact part between a refrigerator and a door according to an exemplary embodiment. Here, at least the main body uses a vacuum insulator.

Referring to FIG. 25 , the main body 2 and the door 3 are attached to each other. At this time, the adhesive force of the two members is generated by the attractive force between the magnet 83 installed on the gasket 80 of the door 3 and the member having the magnetism provided to the body 2 side. It is preferable to provide a magnetic material, such as iron, at a position close to the magnet 83 in order to generate a greater adhesive force.

A cover assembly 400 is provided on the edge of the vacuum insulator in order to obtain greater magnetism. The cover assembly is made of a cover insulating material 401 using a resin as a non-metal as an example at a place corresponding to the side surface of the sealing frame, and a magnetic material such as iron at a place corresponding to the inner and outer surfaces of the sealing frame. Arms 402 and 403 may be included.

Since the distance between the magnetic body on the main body side and the magnet 83 can be reduced by the arms 402 and 403, the adhesive force between the door and the main body can be increased. In this case, even if the thickness of the cover insulating material 401 is increased to further increase the strength reinforcing action of the vibration insulator, a decrease in the adhesive force may not occur.

The cover insulating material 401 can sufficiently protect the conductive resistance sheet 60 by increasing the thickness, and can reduce heat loss by performing an insulating action.

Since the arms 402 and 403 can be made of metal, problems such as breakage do not occur even if elastic deformation occurs when the cover insulating material 401 is mounted. When stainless is used as the material, the problem of breakage and deterioration may not occur even after long-term use.

The arms 402 and 403 have a thinner and more resilient configuration compared to other embodiments made of resin to protect the rim of the body.

The first reinforcing member 100 and the second reinforcing member 110 for reinforcing the strength of the vacuum insulator, the radiation resistance sheet 32 for reducing heat transfer, and the supporting unit 30 are the same as in the original embodiment. may be provided. It goes without saying that the other members may be applied together between the embodiments as long as they do not collide.

26 is a cross-sectional view of the edge of the vacuum insulator, the shape of which may be emphasized depending on the member.

The configuration and operation of the cover assembly will be described in more detail with reference to FIG. 26 . First, as described above, the cover assembly 400 is provided on the outside of the conductive resistance sheet 60 , and the cover assembly 400 has a cover insulating material 401 having a rectangular cross section using a resin as a preferable material. , and an inner arm 402 and an outer arm 403 made of a magnetic material are provided.

The inner arm 402 and the outer arm 402 include fastening parts 4021 and 4031 fastened to the cover insulating material 401 , and shoulder portions extending along the outer shape of at least a portion of the cover insulating material 401 . 4022 , 4024 , 4032 , 4034 , and arm portions 4023 , 4033 extending further along the plate member 10 , 20 .

Even if at least one of the inner arm and the outer arm is made of a resin material, it may be possible to provide an adhesive force to the magnet 83 .

The coupling parts 4021 and 4031 and the cover insulation 401 may be coupled to each other in various ways such as bonding, mechanical coupling, insert injection, and interference fitting. In the drawings, the method of insert injection may be applied.

The length of the first shoulder portions 4022 and 4032 may be provided to be 25% or less of the total length of the cover insulation material so that the insulation action of the cover insulation material is not affected. The second shoulder portions 4024 and 4034 may be provided to be less than 20 millimeters for the convenience of installation. The thickness of the cover insulating material may be provided to be less than 3 millimeters.

When the cover assembly 400 is mounted on the vacuum insulator, the arm portions 4023 and 4033 may perform an unfolding operation with a predetermined rotation angle. The arm parts 4023 and 4033 may hold the plate members 10 and 20 to fix the position of the cover assembly 400 .

The shoulder portions 4022, 4024, 4032, 4034 are interposed between the arm portions 4023, 4033 and the fastening portions 4021 and 4031, and assist the gripping action of the arm portion, The cover assembly 400 may be protected and reinforced. In particular, the portion where the first shoulder portion 4022, 4032 and the second shoulder portion 4024, 4034 are connected is vulnerable to external impact, and a reinforcing effect can be obtained by protecting the metal material. The connecting portions 4021 and 4031 and the shoulder portions 4022, 4024, 4032, and 4034 may be extended by bending the connecting portions.

The configuration of the cover assembly may be divided into parts.

Specifically, the cover assembly 400 includes a front cover part 410 that extends further from the ends of the plate members 10 and 20 to protect the front of the vacuum insulator, and inner and outer sides at the ends of the vacuum insulator. It can be divided into an inner cover portion 420 and an outer cover portion 430 that protect the respectively.

The front cover part 410 is disposed on the outside of the conduction resistance sheet, and the thickness thereof may be provided to be thicker than the thickness of the plate members 10 and 20 . According to this, it is possible to reduce dew generated in the periphery of the conductive resistance sheet.

When the heat transfer amount of the cover assembly is observed, the heat transfer amount of the inner and outer cover parts 420 and 430 is greater than the heat transfer amount passing through the front cover part 410 . The reason is that the arms 402 and 403 having high conductivity are spaced apart from each other by the resin of the cover insulating material. Accordingly, the front cover part 410 may perform an action of reducing heat transfer through the cover assembly.

In order to further reduce the amount of heat conduction through the front cover part 410 and increase the structural stability of the mechanical structure, the thickness of each member of the cover assembly may be proposed as follows.

First condition: conduction resistance sheet (60) ≤ inner and outer cover parts (420, 430),

Second condition: inner and outer cover parts 420, 430 ≤ plate members 10, 20,

Third condition: plate member (10) (20) ≤ front cover part (410),

Fourth condition: the inner and outer cover parts 420 and 430 x 3 ≤ the front cover part.

Accordingly, it is possible to further reduce the amount of heat conduction through the front cover part 410 , and, as a result, the amount of heat transfer through the cover assembly together with structural reinforcement, that is, the amount of heat transfer passing through the inside and outside can be further reduced.

Meanwhile, in order to reinforce the structural strength of the vacuum insulator and further block vacuum leakage, the ends of the inner and outer arm parts 4023 and 4033 and the ends of the plate members 10 and 20 are mutually can be welded. The welded portion may be provided in a closed curve structure for sealing. Of course, if sealing is possible, other fastening methods other than welding may be applied. In addition, if the sealing is not strictly requested, various methods such as clamping and the like may be applied.

As already described, the door and the body for providing the refrigerator can be conveniently attached to each other by a magnet. To this end, the front cover part 410 may be placed at a position where at least a portion of the magnet 83 overlaps, and a magnetic material may be disposed on at least a part or a rear side of the front cover part 410 .

Although this embodiment is illustrated as being placed on the front side, the present embodiment is not limited thereto, and a part of the magnetic arm is disposed inside the front cover part, or a part of the magnetic arm is disposed on at least one of the front and rear surfaces of the front cover part. Alternatively, at least a portion of the magnetic plate member may be disposed at the rear of the front cover portion, or at least a portion of the conductive resistance sheet made of a magnetic material for connecting the plate member to the rear of the front cover portion may be disposed.

In order to conveniently fasten the rim of the cover assembly and the vacuum insulator and reinforce the strength of the rim, the front cover part 410 and the inner and outer cover parts 420 and 430 are as follows. It can have the same strength, yield strength, and modulus of elasticity as conditions.

First condition: The elastic modulus (N/m) of the front cover part 410 is greater than that of the inner and outer cover parts 420 and 430 .

Second condition: The yield strength (N/m2) of the front cover part 410 is smaller than the inner/outer cover parts 420 and 430.

Third condition: The thickness of the front cover part 410 is greater than that of the inner and outer cover parts 420 and 430 .

According to the above conditions, the fastening of the cover assembly can be facilitated, and the emphasis, in particular, the edge and corners of the vacuum insulator can be protected and the strength can be increased. In order to lower the elastic modulus of the inner and outer cover portions 420 and 430, the inner and outer cover portions may be provided in a grid structure.

Another embodiment that can satisfy the various conditions described above in various aspects is provided. In the description of another embodiment below, the different parts are specifically presented based on FIG. 26, and the description of FIG. 26 is applied to the same parts.

First, FIGS. 27 to 31 show another embodiment in which the shoulder portions 4022 , 4024 , 4032 , 4034 and the fastening portions 4021 and 4031 are different.

Referring to FIG. 27 , the end of the fastening part is bent to additionally have bent parts 4025 and 4035 , and the distance L1 between the fastening parts and the length L3 of the first shoulder parts 4022 and 4032 are maintained. Examples can be seen. In this embodiment, the fastening force between the inner and outer arms 402 and 403 and the cover insulator 401 can be increased, and the power to reduce heat conduction through the front cover part 410 can be maintained. The arm may be fixed to the cover insulator in a manner such as insert injection and interference fit.

Referring to FIG. 28 , the second shoulder portions 4024 and 4034 are not provided separately, and the first shoulder portions 4022 and 4032 are provided on the inner surface of the cover insulating material 401 . According to this embodiment, although the function of the conductive resistance sheet can be reduced, it can also be implemented by intervening another material between the sheet and the arm.

Referring to FIG. 29 , the fastening parts 4021 and 4031 are not provided. This embodiment is intended to improve the convenience of fastening, and the shoulder portion can be directly fastened to the cover insulating material by strong bonding or mechanical fastening action.

Although not shown, an embodiment in which the first shoulder is not provided and only the second shoulder is provided may be considered.

Referring to FIG. 30 , the first shoulder portions 4022 and 4032 may be provided inside the cover insulating material 401 . In this case, a separate fastening part may not be provided.

Referring to FIG. 31 , the fastening portions 4021 and 4031 and the second shoulder portions 4024 and 4034 are not provided, and the first shoulder portions 4022 and 4032 may perform their functions. The first shoulder portions 4022 and 4032 are provided on the inner surface of the cover insulating material, and the fastening method and additional insulating material as already described may be interposed therebetween.

32 to 43 further separate the distance between the arms 402 and 403 in order to further contribute to the conduction resistance by the conduction resistance sheet. Accordingly, an embodiment that further reduces the heat conduction passing through the front cover part 410 is presented. The same description as in the previous embodiment is assumed to be applied as it is.

Referring to FIG. 32 , it can be seen that the length L4 of the first shoulder portions 4022 and 4032 is provided shorter than that of other embodiments. Accordingly, the distance between the ends of the arms 402 and 403 becomes longer, and the insulation distance L2 by the cover insulation material 401 becomes longer, so that the insulation action by the front cover part 410 is further improved. advantage can be obtained.

Referring to FIG. 33 , compared with the embodiment of FIG. 32 , the position of the conductive resistance sheet 60 is changed to the side instead of the front, which is characteristically different. In the drawings, it is shown as being provided on the inside. This embodiment can be applied to a case where it is difficult to install a conductive resistance sheet as a vacuum insulator of a small size.

Referring to FIG. 34 , as in FIG. 33 , in addition to the length L4 of the first shoulder portions 4022 and 4032 being shorter than in other embodiments, as shown in FIG. 28 , the second shoulder portions 4024 and 4034 ) is not provided separately, and the first shoulder portions 4022 and 4032 are provided on the inner surface of the cover insulating material 401 .

That is, the modified idea of FIGS. 28 and 33 is added together with the idea of FIG. 26 . According to this, the features of each modification can be implemented together.

35 is characteristically different from that of the embodiment of FIG. 34 in that the position of the conductive resistance sheet 60 is changed to the side instead of the front.

Referring to FIG. 36 , the modified idea of FIGS. 29 and 33 is added together with the idea of FIG. 26 . According to this, the features of each modified example can be implemented together.

FIG. 37 is characteristically different from the embodiment of FIG. 36 in that the position of the conductive resistance sheet 60 is changed to the side instead of the front.

Referring to FIG. 38 , the modified idea of FIGS. 30 and 33 is added together with the idea of FIG. 26 . According to this, the features of each modified example can be implemented together.

Fig. 39 is characteristically different from that of the embodiment of Fig. 38 in that the position of the conductive resistance sheet 60 is changed to the side instead of the front.

Referring to FIG. 40 , the modified idea of FIGS. 31 and 33 is added together with the idea of FIG. 26 . According to this, the features of each modified example can be implemented together.

FIG. 41 is characteristically different from that of the embodiment of FIG. 40 in that the position of the conductive resistance sheet 60 is changed to the side instead of the front.

Referring to FIG. 42 , all of the first shoulder parts 4022 and 4032 and the fastening parts 4021 and 4031 are gone, and at least a part of the second shoulder parts 4024 and 4034 is a fastening part and It performs the role of the first shoulder part together.

43 is characteristically different from that of the embodiment of FIG. 42 in that the position of the conductive resistance sheet 60 is changed to the side instead of the front.

According to the various embodiments and modifications described above, it can be seen that the cover assembly can be implemented in various ways.

Hereinafter, another embodiment in which the cover insulating material 401 is divided into two members will be described. When the cover insulating material is separated, since the parts are unified according to the structure of the vacuum insulator, the manufacturing cost can be reduced.

44 is a cutaway perspective view of the edge of the vacuum insulator according to another embodiment, and FIG. 45 is a cross-sectional view of the edge.

44 and 45 , a first cover insulator 4011 facing the inside of the vacuum insulator and a second cover insulator 4012 facing the outside of the vacuum insulator are provided. The two cover insulators may be fastened to each other by the cover fastening part 4013 .

The cover fastening part 4013 is shown as a structure of a groove and a hook ring, but is not limited thereto, and may be fastened in various ways such as attachment, screw coupling, and fitting.

The inner and outer arms 402 and 403 may be fitted in the gap portion between the first cover insulator 4011 and the second cover insulator 4012 .

Although not shown, openings are provided in the inner and outer arms 402 and 403 , and the cover coupling part 4013 may be inserted into the openings. According to this structure, it is possible to have a structure in which the cover fastening part 4013 holds the inner and outer arms 402 and 403, and thus the fastening force of the inner and outer arms 402 and 403 becomes stronger and stronger. can be expected

According to the present embodiment, it is possible to reduce the component inventory cost and implement the cover assembly in various ways to correspond to the rim of the vacuum insulator having various structures.

On the other hand, in FIG. 18 and the related description, the hotline 270 is accommodated in the sealing frame 200 to prevent dew formation is disclosed. The hotline 270 may prevent dew formation occurring at the boundary between the door and the main body in contact with the cold air transmitted from the inside of the refrigerator.

The hotline 270 transfers heat to the sealing frame 200 to prevent dew formation, but since heat is directly transferred to the conductive resistance sheet 60, heat loss of the hotline increases. In addition to this, there is also a problem in that the loss of cold air inside the furnace increases. Since the plate member and the conductive resistance sheet are made of a metal with high thermal conductivity, the problem of energy loss is further increased.

A preferred embodiment of installing the hotline in a refrigerator made of a vacuum insulator in addition to the problem of such energy loss is presented below.

46 is a cross-sectional view of a boundary portion between a door and a body in the refrigerator according to an exemplary embodiment. Fig. 46(a) shows an Example, and Fig. 46(b) shows a comparative example explaining the advantages of the Example. Here, a vacuum insulator may be preferably applied to the body. As for the detailed description of the vacuum insulator, the bar already described may be applied.

Referring to FIG. 46( a ), the refrigerator according to the embodiment includes a body 2 and a door 3 . The wall of the main body 2 is provided as the vacuum space portion. The vacuum space portion may be provided to include a first plate member 10 , a second plate member 20 , and a conductive resistance sheet 60 , as already described.

The cover assembly 400 may be included at the edge of the vacuum space to protect the conductive resistance sheet 60 and prevent energy loss. The door 3 may be in contact with an end of the cover assembly 400 so that the interior space of the refrigerator is closed to the outside. A gasket 80 is installed in the door 3 to prevent leakage of cold air in the refrigerator and inflow of hot air from outside through the gap between the main body 2 and the door 3 . A magnet 83 is provided on the gasket 80 so that the door can be in close contact with the cover assembly.

The magnet 83 may be positioned to face and correspond to at least a portion of the cover assembly 400 . Accordingly, the magnet 83 and the cover assembly 400 may be in close contact with each other by magnetic force. To this end, at least a portion of the cover assembly 400 may be provided with a magnetic material.

Any part of the gasket 80 may further extend into the interior space. For example, at least one of the plurality of air pockets included in the gasket 80 may extend into the interior space by a predetermined length W1. According to this, it is possible to prevent heat conduction through the gasket and improve the insulation effect through the gasket, and it is possible to reduce the loss of cold air in the refrigerator.

The thickness of the gasket 80 may be greater than the thickness of the vacuum insulator. This is because the thickness of the gasket 80 is preferably thicker in order to obtain a corresponding thermal insulation action through the gasket because the vacuum insulating action of the vacuum insulator is high. In other words, since heat transfer can occur even through the air accommodated in the gasket 80, it is preferable to make the gasket thick. Accordingly, it is preferable to increase the thickness of the gasket 80 having a high heat transfer coefficient in the atmospheric state rather than the vacuum insulator having a low heat transfer coefficient in the vacuum state.

On the inner surface of the door 3 , a door liner 82 may be inclined toward the inside of the cabinet and extend. A gap between the door liner 82 and the first plate member 10 may be formed to be a narrow gap through which cold air is difficult to pass, thereby providing an energy nose.

At least one air pocket included in the gasket 80 and extending into the interior space may contact the door liner 82 . Through this, the loss of cool air passing through the gasket 80 and the loss of cold air conducted along the surface of the door liner 82 can be reduced.

The cover assembly 400 may be provided with an inner cover portion 420 , an outer cover portion 430 , and a front cover portion 410 . The same description as already described may be applied to the operation of each of the cover parts, unless it is specifically mentioned.

In order to provide the cover assembly 400, for example, a cover housing 530 made of a resin such as ABS resin may be provided. The cover housing 530 may define a predetermined internal space together with the conductive resistance sheet 60 . The inner space may be filled with a foam member such as iso pink to provide the cover insulating material 401 . The cover insulating material 401 may protect the conductive resistance sheet and shield heat transfer through the conductive resistance sheet.

A heating member 510 may be placed on the outer surface of the cover housing 530 . The heating member 510 may be a hotline. The hotline may be provided on the front surface of the cover housing 530 . Here, the front surface refers to a front surface in contact with the door. The hotline may be located at an outside of the front surface of the cover housing 530 . Accordingly, more heat can be transferred to the outside.

The cover housing 530 may provide the inner cover part 420 and the front cover part 410 . The cover insulating material 401 may provide the front cover part 410 together with the cover housing 530 .

In order to be fastened to the cover housing 530 , cover the heating member 510 , and provide the outer cover part 430 , a heating member cover 550 may be provided. The heating member cover 550 may be made of a magnetic material so that the magnetic force of the magnet 83 is applied.

Referring to FIG. 46(b), the first plate member 10, the second plate member 20, and the conduction resistance sheet 60 are provided as in the embodiment. In addition to this, in order to provide the front cover part 410, a metal member 21 made of a metal, and a cover insulating material 401 foamed with isopink as a material in the inner space of the metal member 21 can be charged.

In the case of the comparative example, the hotline is omitted, but may be provided outside the front surface of the metal member 21 . Comparing the example of FIG. 46(a) and the comparative example of FIG. 46(b), the following differences can be seen.

First, a plurality of foaming holes are provided in the cover housing 530 and the metal member 21 in order to foam the foaming liquid to provide the cover insulating material 401 . During foaming of the foaming liquid, the liquid resin does not flow easily on the surface of the metal. Accordingly, there may be a problem in that the foaming liquid expands while being solidified to change the original shape of the part.

For example, if the foaming liquid does not flow well through the metal member 21 and thus an unfilled space occurs, the deformation of the metal member 21 may be greater. In order to improve this problem, there is a problem in that more foaming holes must be formed in the metal member 21 . However, since the strength of the metal member is weakened due to the foaming hole, the possibility that the metal member 21 is deformed may increase.

On the other hand, in the case of the cover housing 530 , for example, since ABS resin is used as a material, there is an advantage in that the foaming liquid smoothly flows through the inner surface of the cover housing 530 . Accordingly, there is an advantage in that a smaller number of holes for calling out may be provided. Furthermore, since the foamed liquid flows well and spreads evenly in the internal space, there is also little risk of deformation of the cover housing 530 due to uneven expansion during solidification of the foamed liquid.

Although the conductive resistance sheet 60 is made of metal, the foam liquid may flow smoothly along the inner surface of the cover housing 530 for the entire inner space in which the cover heat insulating material 401 is placed. For this reason, the foaming liquid can be evenly spread throughout the interior space. When the foaming solution solidifies and expands, it can be deformed by further pushing the conductive resistance sheet 60 toward the vacuum space. Conductive resistance sheet can be deformed because it is a thin metal plate.

As the conductive resistance sheet 60 is further drawn into the vacuum space part due to the expansion of the foaming liquid, the insulation space of the cover insulation material 401 can be expected to become larger. In addition, since the air bubbles of the foaming member can be larger when the foaming solution is solidified and expanded, the advantage of increasing the insulation efficiency by the cover insulation material 401 can be expected. This is because the thermal conductivity of air is smaller than that of the resin constituting the foaming liquid. As a result, there is an advantage in that the thermal insulation effect of the front cover part 410 is further increased by the deformation of the conductive resistance sheet.

Since the cover housing 530 is made of resin, a greater advantage can be expected when the foam member is provided in the inner space of the cover housing 530 .

47 is an enlarged view showing the end of the vacuum insulator according to the embodiment.

Referring to FIG. 47 , as already described, the front cover part 410 , the inner cover part 420 , and the outer cover part 430 are provided in the cover assembly 400 .

In the outer cover part 430 , a conductive part 553 may extend to a predetermined length along the second plate member 20 in order to prevent dew formation. The conductive part 553 may form a part of the heating member cover 550 . The conductive part 553 may couple the second plate member 20 and the cover assembly 400 to each other.

In the inner cover part 420 , an inner extension part 531 has a predetermined length along the first plate member 10 for fastening the first plate member 10 and the cover assembly 402 . can be extended The inner extension 531 may form a part of the cover housing 530 .

In a portion of the front cover portion 410 adjacent to the interior space, the cover housing 530 for preventing heat conduction of the hotline is placed.

A heating member cover 550 may be placed on the outer surface of the cover housing 530 in a portion adjacent to the outer space of the front cover portion 410 . The heating member cover 550 may cover the heating member 510 . Through the heating member cover 550, the heat of the heating member 510 may be better transferred to the outdoor space.

A cover insulating material 401 is placed in the inner space of the front cover part 410 to shield the heat of the heating member from being transferred to the conductive resistance sheet 60 .

The cover housing 530 will be described in detail.

The cover housing 530 may include an outer extension 535 corresponding to the outer space, an inner extension 531 corresponding to the inner space, and a front extension 532 contacting the door.

The outer extension portion 535 , the inner extension portion 531 , and the front extension portion 532 may form a predetermined internal space in which the cover insulation material 401 is placed together with the conductive resistance sheet 60 . can In the inner space, the foam member may be foamed to provide the cover insulating material 401 .

The outer extension 535 , the inner extension 531 , and the front extension 532 may be provided in a structure bent at 90 degrees to each other. With such a structure, the inner space, the outer space, and the door adhesion surface to which the door is closely attached may be provided, respectively.

The outer surface of the outer extension portion 535 may be aligned with the outer surface of the second plate member 20 . Through this, the conductive part 553 of the heating member cover 550 may cover the outer surfaces of the outer extension part 535 and the second plate member 20 in a flat manner. The conductive part 553 receives heat from the heating member 510 . The conductive part 553 may be in close contact with the second plate member 20 to prevent dew formation not only on the conductive part 553 itself but also on the second plate member 20 .

The inner extension 531 may contact and cover the first plate member 10 . Accordingly, it is possible to prevent the inflow of cold air into the gap between the inner extension 531 and the first plate member 10 . The inner extension portion 531 may extend toward the rear wall portion into the inner space of the refrigerator by a predetermined length. A mounting position of the cover assembly 400 may be fixed by the inner extension 531 .

In order to stably mount the cover assembly 400 , the length of the conductive part 553 and the length of the inner extension part 531 may cooperate with each other. For example, if the length of the conductive part 553 is long, the cover assembly may be stably mounted even if the length of the inner extension part 531 is short. Conversely, when the length of the conductive part 553 is short, the length of the inner extension part 531 is provided so that the cover assembly can be stably mounted.

As a result, the installation position of the cover assembly can be fixed by the action of the conductive part and the inner extension part holding the vacuum insulator together.

A door may be in close contact with at least a portion of the front extension part 532 .

A heating member seating groove 534 is provided at a predetermined position adjacent to the outer extension 535 in the front extension 532 . The heating member 510 may be accommodated in the heating member seating groove 534 . As already described, the heating member 510 may exemplify a hotline through which a hot refrigerant flows.

The heating member corresponding portion 552 of the heating member cover 550 may cover the heating member seating groove 534 to receive heat from the heating member 510 . The heat of the heating member corresponding part 552 may be transferred to the conductive part 553 and the fastening part 551 to prevent dew formation. In particular, a lot of heat is transferred to the conductive part 553 to prevent dew formation.

A fastening pocket 533 may be provided at one side of the heating member seating groove 534 toward the inner space. The fastening portion 551 of the heating member cover 550 may be fastened to the fastening pocket 533 . By the fastening action of the fastening pocket 533 and the fastening part 551 , the heating member cover 550 and the cover housing 530 may form a single body.

The heating member cover 550 will be described in more detail.

In the heating member cover 550 , a heating member corresponding portion 552 corresponding to the heating member, a conductive portion 553 extending along the second plate member 20 , and a fastening coupled to the cover housing 530 . A portion 551 may be included. The heating member counterpart 552 , the conductive part 553 , and the fastening part 551 may each be provided in a structure bent by 90 degrees from each other.

The heating member counterpart 552 is a portion that receives heat from the heating member, and may be in contact with the heating member. The heat transferred to the heating member counterpart 552 may be transferred to the conductive part 553 and the fastening part 551 . The inner end of the heating member corresponding portion 552 may be aligned to overlap the gasket 80 . In other words, the heat transferred from the heating member 510 and the cold air transferred in the refrigerator along the cover housing 530 may meet each other in a region where the gasket 80 and the front cover part 410 overlap each other. According to this, it is possible to remove the portion where the cold air transmitted from the inside of the refrigerator directly meets the outside air, and consequently, dew formation can be prevented. At least a portion of the heating member counterpart 552 may be aligned with the gasket 80 .

More preferably, the inner end of the high inner end of the heating member counterpart may be aligned in a region where the magnet 83 and the front cover 410 overlap (refer to W2 of FIG. 46(a)). Through this, it is possible to block the contact between the cold inside the refrigerator and the outside air at the portion where the door and the body are closest to each other.

The fastening part 551 is a portion corresponding to the fastening pocket 533 . Since the fastening part 551 is firmly fitted to the fastening pocket 533 , the heating member cover 550 and the cover housing 530 may form one body with each other. In order to prevent the fastening part 551 from moving inside the fastening pocket 533, a predetermined tooth structure and a locking structure may be provided.

The fastening part 551 may be placed in an area where the gasket and the front cover part overlap. As a result, the hotline cover 550 may no longer extend toward the inside of the refrigerator, and energy loss, ie, entropy increase, caused by intense mixing of the hot air of the heating member and the cold air in the refrigerator may be prevented.

More preferably, the fastening part 551 may be aligned with the area W2 where the magnet 83 and the front cover part 410 overlap each other. Through this, it is possible to prevent an increase in the amount of mixing of the hot air of the heating member and the cold air in the furnace, that is, entropy.

The conductive part 553 may be bent from the heating member counterpart 552 to extend along the outer surface of the second plate member 20 in the direction of the rear wall of the refrigerator. Accordingly, the heat of the heating member 510 may be conducted to the rear. The conductive part 553 may be in contact with the outer surface of the second plate member 20 .

The conductive part 553 may extend in the direction of the rear wall of the refrigerator beyond at least the location where the conductive resistance sheet 60 is located. In other words, the conductive part 553 may extend at least to a position where the conductive resistance sheet 60 is placed. According to this, it is possible to prevent dew formation due to the cold air conducted along the conduction resistance sheet 60 .

More desirably, the conductive portion 553 extends to a position beyond the position of the conductive resistance sheet 60 . Accordingly, it is possible to prevent the formation of dew around the conductive resistance sheet 60 due to the cold air in the refrigerator being conducted along the conductive resistance sheet 60 . The vicinity of the end of the conductive resistance sheet 60 may be particularly vulnerable to dew formation because the temperature is low as a portion to which the cold air in the refrigerator is transmitted.

In the front cover part 410 , the first area adjacent to the inner side of the cabinet may be covered by the thick cover housing 530 made of a resin material having low thermal conductivity. The first region may be covered by a gasket 80 . Since the first area is covered by the gasket 80, the cold air in the refrigerator is not directly transmitted. In other words, only heat and cold conducted along the cover housing 530 may exist in the first region, and heat transfer through the internal space and convection action may not exist. Accordingly, it is possible to further reduce the loss of cold air in the interior space.

The second area adjacent to the high outer side of the front cover part 410 is thick and made of a resin material having low thermal conductivity, and a thin and high thermal conductivity heating member cover 550 made of a metal material is overlapped and covered together. can be In terms of strength, the cover housing 530 may have a greater effect, but in terms of heat conduction, the heating member cover 550 may have a greater effect. In other words, the heat conducted along the heating member cover 550 may be greater than the heat conducted along the cover housing 530 . As already described, the heat conducted along the hotline cover 550 may be transferred to at least the periphery of the conductive resistance sheet 60 .

Another example is presented.

The cover housing 530 may not be provided in the second area. Specifically, the cover housing 530 may not be provided on the left side of the fastening pocket 533 with reference to FIG. 47 . In this case, in order to reinforce the strength of the second region, supplementary measures such as increasing the strength such as thickening the hotline cover 550 may be provided. Even in this case, the heat conduction through the heating member corresponding portion 552 and the conductive portion 553 of the heating member cover 550, and accordingly, the action of preventing dew formation remains unchanged.

In this case, the cover insulating material 401 may not inject the foaming liquid into the inner space of the conductive resistance sheet and the cover housing 530 at the manufacturing site, but may be coupled to the already molded porous material. Of course, it is not impossible to inject the foaming liquid.

The heating member cover 530, thinner than the plate members 10 and 20, and thicker than the conductive resistance sheet 60, a plate-shaped member made of stainless steel may be preferably used. The first action of actively conducting heat transferred from the heating member 510 toward the rear wall of the refrigerator by the heating member cover 530, and the second of maintaining the mounting strength of the cover assembly 400 This is because the action and the third action for maintaining the shape of the heating member cover itself, particularly the shape of the bent portion, must be performed together. Here, it can be easily understood that the first action is more advantageous as the thickness increases, and the second action and the third action are more advantageous as the thickness increases.

For example, when the plate member is 1 millimeter and the conductive resistance sheet is 0.2 millimeters, the heating member cover 530 may use a member having a thickness of 0.6 millimeters, which is an intermediate value. Even if the thickness of the plate member and the conductive resistance sheet are different, an intermediate value of both members may be used as the thickness of the heating member cover 530 .

The cover housing 530 may maintain its shape by itself as a material of a resin material. In particular, the cover housing 530 should maintain the shape of the bent portion. To this end, the thickness of the cover housing 530 may be greater than the thickness of the door liner 82 . For example, it is possible to apply a thick ABS resin three to four times the thickness of the door liner.

A plurality of foam injection holes for injecting the foam liquid into the inner space of the cover insulating material 401 may be provided through the cover housing 530 . Since the internal space in which the cover insulating material 401 is accommodated is narrow, the foaming liquid injection hole is preferably provided more than other refrigerators to which a vacuum insulator is not applied.

The cover insulating material 401 may provide a path through which the heat transferred from the heating member 510 penetrates into the inner space of the refrigerator. In this case, the width and thickness of the cover insulating material 401 may be provided in a configuration capable of minimizing heat penetration into the interior space.

FIG. 48 is an exploded perspective view of the cover assembly, and FIG. 49 is a perspective view of a body to which the cover assembly is applied to the freezing compartment.

48 and 49 , a cover insulating material 401 is placed inside the cover housing 530 . The cover insulating material 401 may be placed between the conductive resistance sheet 60 and the heating member 510 so that the heat of the heating member is not transferred to the conductive resistance sheet. The cover insulating material 401 may shield and protect the conductive resistance sheet.

Preferably, a foaming liquid is injected into the inner space defined by the cover housing 530 and the conductive resistance sheet 60 to provide the cover insulating material 401 through a foaming process.

The heating member 510 may be seated on the cover housing 530 . The heating member may be a hot line through which a hot refrigerant flows. The heating member 510 is provided with an inlet pipe and an outlet pipe in order to be connected to the machine room. The inlet pipe and the outlet pipe may be connected to the outside of the cover housing 530 through a lower corner of the cover housing 530 . The inlet pipe and the outlet pipe are drawn in and out through the same point, so that the heating member can be installed more conveniently.

A heating member cover 550 may be provided in front of the cover housing 530 . The conductive parts 553 are provided on the left and right sides of the heating member cover 550 to conduct heat from the heating member 510 to the rear of the refrigerator. In this way, dew formation can be prevented.

An upper end of the heating member cover 550 may be provided with a mullion-corresponding cutout 555 from which the conductive portion 553 is removed. Only the front surface of the mullion 300 is exposed to the outside air, and accordingly, dew may also occur only on the front surface of the mullion. The mullion-corresponding cutout 555 represents a state in which the conducting part 553 is removed in response to the characteristics of the mullion.

The lower end of the heating member cover 550 may be provided with a corresponding cut-out portion 556 to shorten the length of the conductive portion 553 . The lower end of the refrigerator is a part in which other members are additionally provided, and the length of the conductive part 553 may be short in order to avoid interference between the parts. The lower end corresponding cutout 556 may provide a shorter length of the conductive portion 553 in response to the characteristics of the lower end of the refrigerator.

In the above-described embodiment, the length of the conductive portion 553 has been described as being slightly longer than that of the conductive resistance sheet 60 . This is to prevent dew formation on the outer wall of the refrigerator caused by the cold air flowing through the conductive resistance sheet 60 .

However, the present invention is not limited thereto, and the conductive part 553 may provide an exterior panel of the refrigerator. Described specifically. The vacuum insulator may be bent on the outer surface by vacuum pressure. The conductive part 553 may extend to the rear end of the refrigerator. In this case, the conductive part 553 may function as an exterior panel covering the side of the refrigerator.

Referring to the exploded perspective view of the main body according to another embodiment shown in FIG. 50 , it can be seen that an extended conductive part 561 extending further from the conductive part 553 is additionally provided. The extended conductive part 561 may extend to the rear end of the refrigerator.

Hereinafter, the effect of the installation mechanism of the heating member shown in FIGS. 46 to 50 will be described in more detail.

FIG. 51 is a view in which thermal analysis is performed on the cross section of the contact portion between the door and the body. FIG. 52 (a) is an example, and FIG. 51 (b) is a comparative example. The comparative example shows a case in which only the resin material cover is provided on the front cover part, and the embodiment shows the case of the embodiment shown in FIG. 47 .

The experimental conditions are: the inside temperature is minus 18 degrees Celsius, the outside temperature is 25 degrees Celsius, and the high outside humidity is 87% relative humidity. Under these experimental conditions, the dew point temperature is 22.7°C.

According to the comparative example of FIG. 51( b ), it can be confirmed that the lowest external surface temperature is 15.9°C, and dew formation occurs over a wide range.

The reason for the occurrence of dew condensation is due to the following reason, even if it is connected by the conductive resistance sheet 60 . First, there is cold air leakage through the metallic conductive resistance sheet 60, secondly, the thermal conductivity through the plate members 10 and 20 thicker than the conductive resistance sheet 60 is high, and thirdly, the stainless steel in the low temperature interior space This is because the entirety of the first plate member 10 is directly exposed, and fourth, even if the front cover part 410 made of resin has low thermal conductivity, a significant level of heat and cold air can be conducted.

According to the example of FIG. 52(a) performed under the same experimental conditions, the lowest outside surface temperature was 22.9°C, confirming that dew formation did not occur. By implementing a temperature slightly higher than the dew point temperature under the same circulation conditions of the hot refrigerant, it can be confirmed that there is an effect of suppressing the increase in entropy and further increasing the energy consumption efficiency.

52 shows a temperature distribution diagram of the heating member cover according to the embodiment.

Referring to FIG. 52 , it can be seen that a temperature higher than the dew point temperature can be obtained over the entire area of the conductive part 553 of the heating member cover 550 .

53 is a view of thermal analysis performed on the cross section of the contact portion between the door and the body, in which FIG. 53 (a) is an embodiment, FIG. 53 (b) is a comparative example, and FIG. 53 (c) is another embodiment indicates Here, the comparative example shows a comparative example of fixing the hotline using a clip as a mechanism most often applied to the fixing of the current hotline.

A comparative example and an Example are comparatively described with reference to FIGS. 53(a) and 53(b).

In the case of the comparative example, a metal clip 701 holds the heating member 510, and a plurality of metal members are directly or indirectly connected to each other through the foam member for fastening the clip and foaming the foam member. Accordingly, a hot temperature atmosphere is created in all adjacent areas adjacent to the bent area of the clip 701 . Therefore, all of the adjacent areas serve as the heating member 510 as a whole, and there is a problem in that a thicker insulating wall must be provided. As a result, since the heat of the heating member 510 is transmitted through a wide three-dimensional area, a thicker insulating wall of the refrigerator is required.

In addition, the loss of cold air can be reduced only when the heat transfer path extending into the furnace along the surface of the member connected to the clip 701 is lengthened. Accordingly, the thickness of the insulating wall is further increased.

In the case of the above embodiment, the heating member 510 is accommodated in the heating member seating groove 534 . The cover housing 530 is made of a resin material and has low thermal conductivity. Accordingly, the amount of heat transmitted through the cover housing 530 to the inside of the heat insulating wall, for example, the cover heat insulating material 401 is small. As a result, the thickness of the cover insulating material 401 forming the inner space may not be as thick as in the comparative example.

In the case of the above embodiment, the heating member cover 550 made of a metal material is in contact with the heating member 510 to receive heat from the heating member. The conductive part 553 of the heating member cover 550 may extend rearward along the second plate member 20 to prevent dew formation.

In the case of the above embodiment, the heating member 510 has a circular shape, and is in contact with the inner surface of the heating member cover 550 at one place. The heating member 510 is supported by the heating member seating groove 534 . Accordingly, the heat of the heating member 510 is mainly transmitted through the heating member cover 550 made of a metal having high thermal conductivity, and hardly transmitted through the cover housing 530 having low thermal conductivity.

A protrusion (not shown) protruding sharply toward the heating member 510 may be provided on the inner surface of the heating member seating groove 534 . According to the projection, the contact portion between the heating member 510 and the heating member seating groove 534 can be made smaller. As a result, heat transferred from the heating member 510 to the cover housing 530 may be further reduced. Likewise, more heat may be transferred to the heating member cover 550 .

The lowest temperature point in the conductive part 553 may be a point at which the conductive resistance sheet 60 meets the second plate member 20 and slightly moves to the rear of the refrigerator. This is the heat flow between each member where the cold air in the oven conducted by riding the thickness of the second plate member and the thickness of the heating member cover 550 and the heat of the heating member conducted along the longitudinal direction of the heating member cover 550 meet. can be attributed to

According to the experimental conditions, it was found that the point about 1 millimeter behind the conductive resistance sheet 60 showed the lowest temperature.

In the case of the above embodiment, the heating member-corresponding part 552 does not extend further into the inside of the cabinet with the fastening part 551 as a limit point. A point beyond the fastening part 551 may be insulated by the cover housing 530 . Accordingly, it is possible to reduce heat conducted into the furnace along the surface of the body.

Comparing the embodiment (53(a)) and the comparative example (53(b)), in the cover housing 530, at the intersection point where the front extension part 532 and the inner extension part 531 meet You can see the temperature is high. Specifically, the temperature of the crossing point is higher than the internal temperature of the furnace. The temperature of the crossing point is higher than the lowest temperature of the first plate member 10 . The temperature of the crossing point is higher than the lowest temperature of the inner extension 531 .

According to this, the hot air of the heating member and the cold air in the furnace meet to increase entropy and decrease energy efficiency.

This phenomenon is due to a number of reasons as follows. First, since the thickness of the vacuum insulator is thin, the first reason that the heat of the heating member 510 penetrates into the refrigerator through the cover housing 530; second, because the vacuum insulator is thin, the door liner 82 and There is a second reason that it is difficult to form an energy nose capable of blocking the flow of cold air between the vacuum insulators. The energy nose is a narrow gap through which air is difficult to flow, and may refer to a region providing a region through which energy is difficult to pass.

The energy nose is denoted by A in each figure of FIG. 53 .

Another embodiment capable of reducing such energy loss is shown in FIG. 53( c ). This other embodiment is different in that the inner high portion of the cover assembly is changed, and other parts are the same as the embodiment shown in FIGS. 46 to 50 . 46 to 50 may be applied to parts without a detailed description of the other embodiment.

Referring to FIG. 53( c ), in another embodiment, the cover insulation material 401 may include an expanded cover insulation material 605 that is further extended along the inner side of the refrigerator, in particular, the first plate member 10 . can The cover insulating material 401 and the expanded cover insulating material 605 may be provided as a single body in a single process. For example, the cover insulating material 401 and the expanded cover insulating material 605 may be formed by a single foaming process. The expanded cover insulating material 605 may further extend along the first plate member 10 and insulate it so that the temperature atmosphere in the furnace does not affect the end of the first plate member 10 .

As the expansion cover insulating material 605 is further included, the temperature of the inner end of the conductive resistance sheet 60 may be higher than that of the original embodiment. In other words, in the original embodiment, since the inner end of the conductive resistance sheet 60 is covered by the inner extension 531 , the cold air inside the cabinet can easily penetrate. On the other hand, in this other embodiment, the expanded cover insulating material 605 is further placed between the high inner end of the conductive resistance sheet and the high inner temperature atmosphere to perform an insulating action. Accordingly, the temperature of the inner end of the conductive resistance sheet 60 may further increase.

In addition, the front end of the first plate member 10 may be insulated by the expanded cover insulating material 605 . Here, the front end of the first plate member 10 may include a portion of the first plate member 10 adjacent to the conductive resistance sheet 60 . For this reason, the temperature atmosphere inside the furnace does not have a large influence on the front end region of the first plate member 10 . Accordingly, the temperature of the inner end of the conductive resistance sheet 60 may be further increased.

In addition, it is possible to reduce heat flowing from the end of the first plate member 10 toward the rear wall of the refrigerator and flowing into the refrigerator. Conversely, by the action of the expansion cover insulating material 605, the temperature of the high outer end of the conductive resistance sheet may be further increased. As a result, it is possible to obtain the advantage that the dew formation on the high outer surface is further reduced.

The isothermal line inside the expanded cover insulating material 605 may be provided predominantly in the vertical direction. According to this, the infiltration of cold air from the inside of the furnace and the penetration of heat from the outside of the furnace are reduced, so that the insulation efficiency can be improved. The isotherm line extends in the vertical direction inside the expanded cover insulating material 605 , but the isotherm line may be provided in a convex shape on the right side, similar to the overall cross-sectional shape of the expanded inner extension part 538 . Accordingly, the effect of the energy nose can be increased. Comparing the inner extension portion 5631 with isotherms predominantly provided in the left and right directions along the longitudinal direction in the original embodiment, the enhancement of the energy nose effect in the present embodiment can be easily understood.

If the isotherms are provided in the vertical direction, it may mean that there is no heat transfer along the plate member and that the expanded cover heat insulating material 605 performs a good heat insulating action. Conversely, if the isotherms are provided in the left and right directions, it may mean that a large number of thermoelectrics occur along the plate member. At the same time, the fact that the isotherm has a convex shape to the right similarly to the expanded inner extension 538, cold air penetration through the surface of the expanded inner extension 538 is small, so that the heat insulation by the energy nose action is good. It can mean being done.

In this other embodiment, the extended front extension 537 further extending in the high inner direction from the front extension 532 is further included. The gasket 80 may be in contact with the extended front extension portion 537 , so that the insulation effect due to the gasket 80 may be further enhanced. Accordingly, since the entire gasket 80 can be in contact with the cover housing 530 , heat passing through the gasket 80 can be further reduced. The extended front extension portion 537 may refer to a portion of the cover housing 530 that is further extended toward the inside of the refrigerator beyond the thickness range of the vacuum insulator.

An extended inner extension 538 extending rearward from the extended front extension portion 537 is further included. The expanded cover insulating material 605 may be accommodated in the inner space of the expanded inner extension part 538 . A constricted portion 539 is provided at an end of the expanded inner extension portion 538 to form an accommodation space for the expanded cover insulating material 605 by contracting toward the first plate member.

In this other embodiment, an inner cover member 600 that covers the conduction resistance sheet 60 and extends along the first plate member 10 is further provided. In the inner cover member 600, a sheet corresponding portion 601 that covers the conduction resistance sheet 60 and extends along the conduction resistance sheet 60, and the first plate member 10 and covers the A plate counterpart 602 extending along the first plate member 10 may be included. The sheet-corresponding portion 601 and the plate-corresponding portion 602 may be bent to each other at the contact portion.

The inner cover member 600 is made of resin, so that the foaming liquid flowing in the inner space of the inner cover member 600 and the cover housing 530 can flow smoothly. To this end, both ends of the inner cover member 600 and the cover housing 530 may be joined to each other so as to form a sealed space therein.

Another embodiment is characterized in that the inner cover portion 420, the plate corresponding portion 602, the expanded cover insulating material 605, and the expanded inner extension portion 602 is provided. Accordingly, the insulation and protection of the inner cover part 420 can be further strengthened.

As another embodiment, the inner Kerr member 600 may not be provided separately. In this case, the upper end of the plate-corresponding part 605 is contracted to come into contact with the first plate member 10 to form a space for foaming therein.

In this other embodiment, the gap between the expanded inner extension 538 and the door liner 82 may be narrower than in the original embodiment. According to this, a more effective energy nose can be obtained compared to the original embodiment, and thus energy consumption efficiency can be further increased.

54 is a graph showing the temperature distribution of the conductive part in the other embodiment. In the graph of FIG. 54 , the horizontal axis represents the distance away from the inlet of the conductive part 553 , and the vertical axis represents the temperature. The inlet of the conductive part 553 may refer to a bending point where the conductive part 553 is in contact with the heating member-corresponding part 552 .

Referring to FIG. 54 , the temperature of the conductive part may be divided into three temperature regions. Specifically, a first rising section (A) in which the temperature rises starting from the inlet of the conduction section (553), a falling section (B) in which the temperature drops at the end of the rising section (B), and the end of the falling section (B) A second rising zone (C) in which the temperature rises may be included.

According to the first rising section (A), the temperature of the inlet end of the conductive part is low, and the temperature increases from the inlet end of the conductive part toward the rear. The inlet end of the conductive part is a part that can be easily contacted when a user holds the door or contacts the refrigerator. Therefore, the user is not surprised by the hot surface temperature, and there is no burn when the heating member is severely heated due to a malfunction of the product.

The boundary point between the first rising section and the descending section is the point with the highest temperature. A boundary point between the first rising zone and the falling zone may be provided as a point where the heating member has the largest area on the conductive part. As already explained, the boundary point is not the inlet end of the conducting part.

In the descending zone, the temperature decreases toward the rear of the conduction unit. The descending region may be defined as a region where heat transferred from the heating member 510 and cold air transferred from the conductive resistance sheet 60 meet each other. Of course, outside air may have an effect, but the description is omitted because it is not dominant. The surface temperature of the refrigerator may be lowered by the cold air passing through the conductive resistance sheet 60 , but dew does not form on the surface of the refrigerator by the heat from the heating member 510 .

As already described, the point at which the temperature of the conductive part 553 is lowest may be provided in the right vicinity of the point where the conductive part 553 and the conductive resistance sheet 60 meet. A boundary point between the descending section (B) and the first rising section (C) may be provided as an area adjacent to the conductive resistance sheet. A boundary point between the descending section (B) and the first rising section (C) may be provided in a straight rearward direction of the conduction resistance sheet.

It can be seen that the temperature of the lowest point in the conductive part 553 is provided at 22.7 degrees Celsius or more. Accordingly, dew formation may not occur on the surface other than the refrigerator compartment.

In the second rising zone (C), the temperature rises again toward the rear. This can be considered that the cold air atmosphere transferred from the conductive resistance sheet 60 is heated by the outside air. The rising gradient of the second rising section (C) is smaller than that of the first rising section (A). The absolute value of the rising gradient of the second rising section C is smaller than the absolute value of the falling section.

By providing the above-described tendency of the temperature gradient value, it is possible to completely prevent dew condensation occurring outside the furnace and to prevent dew condensation from occurring at any point outside the furnace. It is possible to achieve the effect of increasing or decreasing energy consumption efficiency together with the prevention of the dew formation.

The temperature change region and temperature gradient of the conductive part can be implemented similarly for the original embodiment, and the same effect can be obtained,

As already described, the cover insulating material 401 may provide a path through which the heat transferred from the heating member 510 penetrates into the inner space of the refrigerator.

The foam member has a small heat transfer compared to metal or resin, but has a high heat transfer rate compared to the vacuum inside the vacuum insulator, so cold air leakage is inevitable. More specifically, in the foam member providing the cover insulating material 401, the greater the thickness, the smaller the heat transfer, and the greater the length, the greater the heat transfer.

The width and thickness of the cover insulating material 401 may be provided in a configuration capable of minimizing heat penetration into the inner space of the refrigerator.

In the insulating action by the cover assembly 400 , the cover insulating material 401 performs a main function for thermal insulation. Overall, the insulation action by the cover assembly 400 is to be performed by the interaction of the cover insulation material 401 , the cover housing 530 , the heating member cover 550 , and the conduction resistance sheet 60 . can

In other words, the insulating action of the cover assembly 400 affects the structure and shape of the cover insulating material 401 , the cover housing 530 , the heating member cover 550 , and the conductive resistance sheet 60 . However, the main effect of the insulating performance is affected by the cover insulating material (401).

Under the background described above, the thickness of the cover assembly 400 and the length of the cover assembly 400 are appropriately suggested. Here, the thickness of the cover assembly may be the same as the width of the vacuum insulator and the front cover part, or may be a numerical value including an engineering difference. The length of the cover assembly may be the same as the longest distance from the conductive resistance sheet 60 to the front portion of the cover housing 530 or may be a numerical value including an engineering difference.

The length of the cover assembly may be substantially the same as the length of the cover insulating material in terms of engineering. The length of the cover assembly may be substantially the same as the length of the front cover part 410 in terms of engineering. The same can be said for thickness.

Referring to the heat transfer path reference diagram shown in FIG. 55 , the path of heat penetration through the cover assembly 400 will be described.

First, the heat generated by the heating member 510 may be transferred into the furnace through the conductive resistance sheet 60 . The heat passing through the conductive resistance sheet 60 decreases as the length of the cover assembly 400 increases when the thickness of the cover assembly 400 is constant. This is because, as the length of the cover assembly increases, the heat transferred to the conductive resistance sheet 60 through the heating member cover 500 and the cover insulating material 401 is reduced. The thermal conductivity of the conductive resistance sheet may be 16W/mK stainless steel.

A path indicated by ① in FIG. 55 represents a heat transfer path passing through the conductive resistance sheet 60 .

Second, heat generated by the heating member 510 may be transferred into the refrigerator through the cover insulating material 401 and the cover housing 550 . Here, the main heat transfer path refers to a path passing through the cover insulating material 401 . Hereinafter, when referring to the heat transfer path passing through the cover insulating material 401 , it may be understood that the cover insulating material 401 and the heat transfer path through the cover housing 550 are referred to together. The thermal conductivity of the cover housing may be 0.2 W/mK of ABS resin, and the thermal conductivity of the cover insulating material 401 may be iso-pink of 0.3 W/mK.

The heat passing through the cover insulating material 401 increases as the length of the cover assembly 400 increases when the thickness of the cover assembly 400 is constant. This is because, as the length of the cover assembly increases, the heat-conducting area of the cover insulating material 401 increases.

A path indicated by ② in FIG. 55 represents a heat transfer path passing through the cover insulating material 401 .

Under the above background, the inventors of the present invention conducted various experiments to find out the correct thickness and length of the cover assembly 400 .

56 to 59 are views for explaining the results of various experiments. First, FIG. 56 shows a main body applied to the experiment as a refrigerator in which the heating member is installed, and FIG. 57 is a case in which the length of the cover assembly is the longest (H1). ), FIG. 58 shows a case where the length of the cover assembly is medium (H2), and FIG. 59 shows a case where the length of the cover assembly is the shortest (H3).

Describe the experimental conditions. The thickness of the cover assembly was fixed to 22 mm. As for the power consumption ratio of the refrigerator, 85% is the adiabatic load, and 15% is the electric field and control. The conditions for dew condensation are based on a high temperature of minus 18 degrees Celsius, a high outside temperature of 25 degrees Celsius, a relative humidity of 87% outside the high school, and a dew point temperature of 22.7 degrees Celsius.

Table 1 summarizes the results of the above experiments.

Item unit Figure 57 (long case) Figure 58 (intermediate case) Figure 59 (short case) Highest outdoor surface temperature ℃ 21.3
(less than 1.4, dew) 22.9
(more than 0.2, no dew) 24.8
(Exceeding 2.1, no dew) adiabatic load W 45 44.9 45.7 penetrating load W 4.7 4.6 5.4 Penetration to minimum value % 7.2 4.1 22.4

In Table 1, the heat insulation load is compared between the inside and outside of the refrigerator on the basis of the entire refrigerator. The penetration load refers to a heat penetration load through the cover assembly. The penetration amount relative to the minimum value means an increased penetration load based on the penetration load at which the penetration load is the smallest when the length of the cover assembly is varied and an experiment is performed.

The results of the experiment are described with reference to Table 1.

If the length of the cover assembly is too long (in the case of FIG. 57 ), dew formation occurs and the penetration load through the cover assembly is increased, which is not preferable. In this case, it can be seen that the heat penetration (①) through the conductive resistance sheet is small, but the needle load increases because the heat penetration (②) through the cover insulating material 401 is increased. It can be seen that dew condensation occurs because sufficient heat is not transferred to the conductive resistance sheet.

If the cover assembly is too short (in the case of FIG. 59 ), dew does not occur, but it is undesirable because heat penetration through the cover assembly is increased. In this case, it can be seen that the heat penetration (②) through the cover insulating material 401 is small, but the needle load increases because the heat penetration (①) through the conductive resistance sheet increases. It can be seen that heat penetration through the conductive resistance sheet is more undesirable because it rapidly increases.

It can be seen that when the cover assembly has an intermediate value (in the case of FIG. 58), dew does not form and the penetrating load is also reduced.

By further analyzing the above experimental results, the inventor further conducted additional experiments. An additional experiment was performed using the ratio of the thickness of the cover assembly 400 to the length of the cover assembly 400 as a factor.

In detail, as confirmed through FIGS. 57 to 59 , when the thickness of the cover assembly is constant, it is not preferable that the length of the cover assembly be excessively long or excessively short. Similarly, when the length of the cover assembly is constant, it can be easily expected that the thickness of the cover assembly is both too long and too short, which is undesirable. Under this background, an experiment was performed using the thickness of the cover assembly and the length of the cover assembly as experimental factors, and the penetration amount compared to the minimum value as the result.

60 is a graph showing a relative increase in penetration load based on the minimum penetration load using the ratio (length/thickness) of the thickness of the cover assembly to the length of the cover assembly as a factor.

Referring to FIG. 60 , when the ratio (length/thickness) of the thickness of the cover assembly to the length of the cover assembly was 0.635, it was confirmed that the lowest penetration load was exhibited.

With the lowest penetration load as the lowest value, the penetration load tends to increase in either left or right direction, and it can be seen that the increase trend of the penetration load is gradually greater. It can be seen that there may be an appropriate range of the ratio (H/W) of the length (H) of the cover assembly to the thickness (W) of the cover assembly.

When the length of the cover assembly is too small, it is not preferable because interference between the heating member seating groove and the conductive resistance sheet occurs. In addition, when the length of the cover assembly is too small, it is not preferable because the flow of the foaming liquid is not smooth when the cover insulating material is foamed. Therefore, it is preferable that the ratio (H/W) of the length (H) of the cover assembly to the thickness (W) of the cover assembly is greater than 0.29.

If the length of the cover assembly is too large, it is not preferable because dew formation may occur in the vicinity of the conductive resistance sheet. Accordingly, the ratio (H/W) of the length (H) of the cover assembly to the thickness (W) of the cover assembly is preferably less than 1.05.

As a result, the ratio (H/W) of the length (H) of the cover assembly to the thickness (W) of the cover assembly may be proposed in the range of 0.29 < H/W < 1.05.

As the same range in the left and right direction of the minimum penetrating load, the ratio (H/W) of the length (H) of the cover assembly to the thickness (W) of the cover assembly may be set in the range of 0.37 < H/W < 0.90. have. This numerical range can be said to be a ratio that the penetration load can be implemented to a minimum. If it is within the above numerical range, it is possible to implement a minimum penetration load even for small changes in thickness, width, length, etc. of other members.

The numerical range may be adjusted according to detailed conditions of the refrigerator.

For example, when the dew condensation of the refrigerator is an important requirement of the product, a stricter standard than 1.05 is applied, and the ratio (H/W) of the length (H) of the cover assembly to the thickness (W) of the cover assembly is 0,29 < H/W < 0.90.

As another example, when the size of the refrigerator is small and the capacity of the heating member is small, a numerical range of 0,37 < H/W < 1.05 may be applied.

However, by proposing the setting criteria of the cover assembly from the viewpoint of dew condensation, component interference, and improvement of energy consumption efficiency, it is possible to more easily design a refrigerator using a vacuum insulator.

The graph of FIG. 60 is drawn, the heat penetration (②) through the cover insulating material 401 is represented by a right-hand curve in the graph of FIG. 60, and the heat penetration (①) through the conduction resistance sheet is the graph of FIG. This is because it appears as a downward-sloping curve.

That is, heat penetration (②) through the cover insulating material 401 increases as the length of the cover assembly increases, and heat penetration (①) through the conductive resistance sheet decreases as the length of the cover assembly increases. .

The graph of FIG. 60 can be moved left and right according to various requirements of the member. For example, two graphs are illustrated and described as shown in FIG. 61 .

Referring to FIG. 61 , the graph on the right is the same as the graph shown in FIG. 60 . The graph on the left shows an example in which the graph of FIG. 60 is moved to the left. The graph on the left may occur when the heating member cover 550 becomes thinner or the conductive resistance sheet 60 becomes thinner.

In detail, even if the length and thickness of the cover assembly do not change, when the thickness of the heating member cover or the conductive resistance sheet decreases, heat penetration (①) through the conductive resistance sheet decreases. Therefore, the downward-right curve representing the heat penetration (①) through the conductive resistance sheet moves to the left. Of course, in the opposite case, it moves to the right.

As another embodiment, the cover insulating material 401 does not inject the foaming liquid into the inner space of the conductive resistance sheet and the cover housing 530 at the manufacturing site, but the porous material of the resin material in the already molded state may be fastened. have.

In another case, it may be provided in a state in which air is contained in the inside of the cover insulating material, or the inner cover member may be provided. In this case, the graph may move to the left or right of the upward curve representing the heat penetration (②) through the cover insulating material 401 . For example, when the insulation of the cover insulation material is performed well, the upward curve indicating the heat penetration (②) through the cover insulation material 401 may move to the left.

Notwithstanding the various trends described above, the optimal ratio (H/W) of the length (H) of the cover assembly to the thickness (W) of the cover assembly may vary, but is within the preferred range as described. can keep

The inventors conducted additional research to prepare a method for preventing dew formation on the external surface of the refrigerator. The occurrence of dew on the external surface of the refrigerator depends on the ambient temperature and relative humidity, and occurs when the surface temperature of the refrigerator is less than a specific temperature. In other words, when the surface temperature of the refrigerator is less than the dew point temperature according to the conditions of the outside air, the dew condensation phenomenon occurs.

In order to prevent the dew condensation phenomenon, the surface temperature of the refrigerator may be controlled to be higher than or equal to the dew point temperature. However, the higher the surface temperature of the refrigerator, the higher the energy consumption efficiency is, so it is not preferable. For this reason, an appropriate control range is required to realize an appropriate surface temperature of the refrigerator.

The outdoor conditions vary depending on various environments in which the refrigerator is placed. For example, under conditions of high temperature and low humidity such as desert, dew formation hardly occurs, so there is no need to be concerned. However, in a high-temperature and high-humidity environment, it must be operated in response to dew condensation. The outdoor conditions may be used by setting the most severe conditions for each country or region.

The following two representative outdoor air can be used. As harsh outdoor conditions, a relative humidity of 87% can be used at a temperature of 25°C. In addition, a relative humidity of 75% at a temperature of 25°C can be used as a general outdoor condition.

The harsh outdoor air condition may cause dew condensation more frequently than the general outdoor air condition.

The lowest temperature on the outer surface of the vacuum insulator and the refrigerator according to the embodiment may be more precisely a position of 1 millimeter behind the conductive resistance sheet 60 as an area adjacent to the conductive resistance sheet 60 . The position is defined as the lowest surface temperature position. In addition, the temperature of the lowest surface temperature position is defined as the lowest surface temperature.

By managing the position of the lowest surface temperature, it is possible to prevent dew condensation from occurring on the entire outer surface of the refrigerator.

62 is a graph showing the lowest surface temperature using a ratio (H/W) of a length of the cover assembly to a thickness of the cover assembly as a factor, similar to the graph of FIG. 60 .

Referring to FIG. 62 , it can be seen that the minimum surface temperature changes according to a ratio (H/W) of a length of the cover assembly to a thickness of the cover assembly.

For example, as the ratio (H/W) of the length to the thickness increases, the minimum surface temperature is lowered and there is a high possibility that the dew condensation phenomenon occurs. Conversely, the smaller the ratio (H/W) of the length to the thickness is, the smaller the minimum surface temperature is, so that the possibility of occurrence of dew condensation is small. However, it is not preferable because the energy consumption efficiency is deteriorated. Furthermore, as already described, the ratio (H/W) of the length to the thickness cannot be approached as close to zero due to the interference between the members.

Referring to FIG. 62 , in the case of the general condition, it is preferable to design the length and thickness ratio (H/W) to be smaller than 1.1. The dew point temperature at this time is 20.3 degrees Celsius.

More preferably, in the case of the severe condition, it is preferable to design the ratio (H/W) of the length to the thickness to be smaller than 0.6. The dew point temperature at this time is 22.7 degrees Celsius.

However, as described above, the ratio (H/W) of the length to the thickness may be less than 0.29 due to factors such as interference between members.

63 is a graph showing the horizontal axis as the ratio (H/W) of the length of the cover assembly to the thickness of the cover assembly, and the vertical axis as the ratio (T2/T1) of the minimum surface temperature and the outside temperature.

Here, the outdoor temperature may be set to an indoor temperature at which the refrigerator is mainly placed. This is because, even if it is set as a design value, the refrigerator is placed in the kitchen, which is a representative space of the room, and the refrigerator can be controlled based on the outdoor temperature of the kitchen and the minimum surface temperature.

Referring to FIG. 63 , when the dew point temperature is 20.3°C, the ratio (T2/T2) of the lowest surface temperature to the outside air temperature is 0.8. When the dew point temperature is 22.7°C, the ratio (T2/T2) of the lowest surface temperature to the outside air temperature is 0.9.

Accordingly, in the case of the general condition, the ratio (T2/T2) of the minimum surface temperature to the outside air temperature may be set to 0.8 or more. In the case of the severe condition, the ratio (T2/T2) of the minimum surface temperature and the outside temperature may be set to 0.9 or more.

As such, in designing the cover assembly, the ratio (T2/T2) of the minimum surface temperature to the outside temperature and the ratio (H/W) of the length and thickness are the main management factors, so that Dew condensation can be prevented.

The ratio (T2/T2) of the minimum surface temperature to the outside temperature and the ratio (H/W) of the length and thickness may be applied differently in various environments. Therefore, one factor may be mainly used, and the other factor may be used as an auxiliary. For example, in a high-temperature and high-humidity environment, the ratio of the minimum surface temperature to the outside temperature (T2/T2) and the ratio of the length to the thickness (H/W) are applied together to obtain a more reliable dew condensation prevention effect. will be able to achieve

According to the present invention, the vacuum insulator is used to protect the sealing part between the main body and the door of the device to which the vacuum insulator is applied, to prevent heat loss due to close contact with the magnet provided in the door, and to increase the stability of the insulating action. It can contribute to commercialization.

According to the present invention, by supplementing the weakness of conduction resistance sheet, which occurs when a vacuum insulator is applied to a device, in various aspects such as strength, external interference, and installation of accessories, vacuum maintenance essential for a device to which a vacuum insulator is applied It is possible to secure the operational reliability of devices such as refrigerators without causing side effects in terms of Due to the above advantages, it can be said that industrial application is greatly expected.

According to the present invention, when a vacuum insulator is applied to a refrigerator, the aspect of preventing dew formation and the objective of increasing energy consumption efficiency can be achieved together. Industrial introduction of refrigerators using vacuum insulators can be greatly accelerated.

400: cover assembly
401: cover insulation
430: outer cover part
510: heating member
530: cover housing
550: heating member cover
600: inner cover member
605: expansion cover insulation

Claims (20)

a first plate member defining at least a portion of a wall for the first space;
a second plate member defining at least a portion of a wall for a second space having a temperature different from that of the first space;
a sealing part sealing the first plate member and the second plate member to provide a third space that is a temperature between the temperature of the first space and the temperature of the second space and is a space in a vacuum state;
a supporting unit for maintaining the third space;
a conductive resistance sheet connecting the first plate member and the second plate member to each other in order to reduce the amount of heat transfer between the first plate member and the second plate member;
an exhaust port for discharging the gas of the third space; and
a cover assembly provided in front of an end of the plate member to cover at least the conduction resistance sheet;
In the cover assembly,
a cover insulation covering the conductive resistance sheet;
a cover housing in which at least a portion of the cover insulation is accommodated therein;
a heating member placed on the outer surface of the cover housing to provide heat; and
and a heating member cover in contact with the heating member and extending toward the second plate member to transfer heat of the heating member to the conductive resistance sheet. The method of claim 1,
A ratio (H/W) of a thickness of the cover assembly to a length of the cover assembly is in the range of 0.29 < H/W < 1.1. 3. The method of claim 2,
Where the lowest surface temperature with the lowest temperature appears on the outer surface of the vacuum insulator is an adjacent region where the conductive resistance sheet is in contact with the second plate member. 4. The method of claim 3,
The ratio (T2/T2) of the minimum surface temperature to the outside air temperature is 0.8 or more. 4. The method of claim 3,
The ratio (T2/T2) of the minimum surface temperature to the outside temperature is 0.9 or more. 6. The method according to any one of claims 4 to 5,
A ratio (H/W) of a thickness of the cover assembly to a length of the cover assembly is in the range of 0.29 < H/W < 0.90. 7. The method of claim 6,
A ratio (H/W) of a thickness of the cover assembly to a length of the cover assembly is in a range of 0.37 < H/W < 0.6. The method of claim 1,
The thickness of the cover assembly is the same as the gap between the first plate member and the second plate member. a body provided with a vacuum insulator and having an opening for an article receiving space;
a door for opening and closing the opening of the body;
a gasket installed on the door for sealing a portion in contact with the door and the body;
a magnet provided on the gasket;
a first plate member providing the vacuum space on one surface and an accommodation space on the other surface to provide the vacuum insulator;
a second plate member spaced apart from the first plate member, the second plate member providing the vacuum space on one surface and the external space on the other surface;
a sealing part sealing the first plate member and the second plate member;
a conductive resistance sheet made of a metal material for connecting the first plate member and the second plate member;
a supporting unit maintaining a gap between the second plate member and the second plate member; and
A cover assembly provided on the rim of the opening is included,
In the cover assembly,
a cover insulating material provided to insulate the edge of the opening;
a cover housing covering one side of the cover insulation material and accommodating the cover insulation material therein;
a heating member seated on the cover housing and providing heat to prevent dew formation in response to the outside temperature; and
a heating member cover for guiding the heat of the heating member toward the second plate member;
A refrigerator exhibiting a lowest surface temperature with the lowest temperature in a region adjacent to the second plate member and the conductive resistance sheet. 10. The method of claim 9,
The cover housing is provided with resin,
The heating member cover is provided with a metallic magnetic material, and the refrigerator interacts with the magnetic force of the magnet. 10. The method of claim 9,
The cover insulating material is a refrigerator that is a porous molded product of a foam member, air, or a resin material. 10. The method of claim 9,
The heating member is placed on an outer surface of the cover housing, and the heating member cover covers the heating member from the outside. 10. The method of claim 9,
At least a portion of the heating member cover extends to the conductive resistance sheet along the second plate member to absorb the cold air of the conductive resistance sheet. 10. The method of claim 9,
In the heating member cover,
a heating member corresponding to the heating member;
a conductive portion extending along the second plate member; and
A fastening part fastened to the cover housing is included,
The refrigerator corresponding to the heating member, the conductive part, and the fastening part are respectively bent to each other. 10. The method of claim 9,
In the cover housing,
an outer extension corresponding to the outer space;
an inner extension corresponding to the inner space; and
A front extension portion corresponding to at least a part of the door is included,
A refrigerator in which the outer extension, the inner extension, and the front extension are bent to each other. 17. The method according to any one of claims 9 to 16,
A ratio (H/W) of a thickness of the cover assembly to a length of the cover assembly is included in the range of 0.29 < H/W < 1.1,
A refrigerator wherein a ratio (T2/T2) of the minimum surface temperature to the outside air temperature is 0.8 or more. 17. The method of claim 16,
A ratio (H/W) of a thickness of the cover assembly to a length of the cover assembly is in a range of 0.29 < H/W < 1.05. 17. The method of claim 16,
A ratio (H/W) of a thickness of the cover assembly to a length of the cover assembly is included in the range of 0.37 < H/W <0.6;
A refrigerator wherein a ratio (T2/T2) of the minimum surface temperature to the outside temperature is 0.9 or more. 10. The method of claim 9,
A refrigerator wherein a ratio (T2/T2) of the minimum surface temperature to the outside temperature is 0.9 or more. a body provided with a vacuum insulator and having an opening for an article receiving space;
a door for opening and closing the opening of the body;
a gasket installed on the door for sealing a portion in contact with the door and the body;
a magnet provided on the gasket;
a first plate member providing the vacuum space on one surface and an accommodation space on the other surface to provide the vacuum insulator;
a second plate member spaced apart from the first plate member and providing the vacuum space on one surface and the high outdoor space on the other surface, which is an environment of outdoor temperature;
a sealing part sealing the first plate member and the second plate member;
a conductive resistance sheet connecting the first plate member and the second plate member, and generating a lowest surface temperature position, which is a lowest surface temperature position, in the second plate member;
a supporting unit maintaining a gap between the second plate member and the second plate member; and
a cover assembly provided on the rim of the opening and having a front cover part for protecting the front of the rim;
In the front cover part,
a first area covered by a cover housing made of a material of low thermal conductivity; and
a second region which is at least covered by the heating element cover made of a material having high conductivity and is in thermal contact with the heating element;
- by the heat conducted to the conductive resistance sheet and the cold air transmitted from the conductive resistance sheet, the ratio (T2/T2) of the minimum surface temperature to the outside temperature is 0.8 or more,
- The ratio (H/W) of the thickness of the cover assembly to the length of the cover assembly is in the range of 0.29 < H/W < 1.1.

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