KR100796293B1 - Dew forms prevention structure of insulation glass door - Google Patents

Abstract

A structure for preventing dew formation of an insulation glass door is provided to interrupt direction contact between a transparent window and a transparent cover through an insulator to block heat transfer to prevent dew formation of a glass door of a wine storage compartment in a kimchi refrigerator. A door frame(10) constitutes an outer appearance of a door(1). A plurality of glasses(21) installed in the door frame are arranged at a transparent window(20) doubly or trebly through metal gap maintaining members(22). A transparent cover(30) is arranged at a front surface of the door frame, covering a front surface of the transparent window. A second heat insulator(70) is fitted into a part where the transparent cover and the glasses of the transparent window contact with each other, along a line where the metal gap maintaining members are arranged, to block heat transfer from the transparent window to the transparent cover.

Description

Dew Forms Prevention Structure Of Insulation Glass Door

1 is a perspective view showing a kimchi storage equipped with a wine cellar according to the prior art,

Figure 2 is a cross-sectional view showing the configuration of the kimchi storage equipped with a wine cell shown in Figure 1 according to the prior art,

Figure 3 is a rear view showing an insulating glass door to open and close the wine cell shown in Figure 1 according to the prior art,

4 is a cross-sectional view taken along the line A-A of Figure 3 showing the configuration of the insulating glass door according to the prior art,

5 is a cross-sectional view taken along the line B-B of Figure 3 showing the configuration of the insulating glass door according to the prior art,

6 is a rear view showing an insulating glass door according to an embodiment to which the present invention is applied;

7 is a cross-sectional view taken along the line C-C of Figure 6 showing the configuration of the insulating glass door according to the present invention;

8 is a cross-sectional view taken along the line D-D of Figure 6 showing the configuration of the insulating glass door according to the present invention.

Description of the main symbols in the drawings

1: insulated glass door 10: door frame

11: through-hole 12: bend

13: gasket assembly 14: seating groove

20: transparent window 21: glass

22: spacing member 23: air layer

30: transparent cover 40: support fixing member

50: gasket 60, 70: first and second insulation

The present invention relates to a dew formation prevention structure of the insulating glass door, and more specifically, double or triple glass insulation to check the interior of the wine cellar even if the door of the wine cellar provided in the kimchi storage is not open. When the glass door is configured, the dew condensation prevention structure of the insulating glass door to prevent the dew condensation phenomenon occurs on the outer surface of the insulating glass door according to the temperature change in the high temperature.

In general, a refrigerator, which is one of means for storing food, allows food to be kept fresh for a long time by setting a desired temperature or setting an optimum temperature according to the food. In modern times, the storage capacity of food is gradually enlarged, and the technology has been gradually advanced with the addition of many functions and conveniences.

In particular, recently, Kimchi storage has been developed and commercialized in the form of specialized kimchi storage function only to allow the kimchi to be matured and long-term storage by storing only kimchi as a situation has received a great response from housewives.

On the other hand, in recent years, as the standard of living gradually improves, many people often drink wine at home.

Because of this, a separate space for storing wine is required in the home, and due to the nature of wine sensitive to the storage temperature, a wine-only reservoir has been developed.

However, when the kimchi cellar and the wine cellar are each installed in a space, in addition to the problem of inefficient use of the space, a separate wine cellar is economically effective in many cases in the case of a home where there is not much use of wine. It wasn't.

For this reason, it was required to develop a product capable of storing kimchi and wine at the same time while efficiently utilizing the space. The wine shown in FIGS. 1 and 2 to which the developed product is attached is required. Kimchi storage is equipped with a storage room.

Hereinafter, with reference to the accompanying Figures 1 and 2 will be described for the kimchi storage equipped with a wine cell according to the prior art.

As shown in FIGS. 1 and 2, the kimchi reservoir equipped with the wine cellar includes a main body 100 having a cooling system including a compressor 161, a condenser 162, an evaporator 163, 164, and the like. Kimchi storage room 120 provided to store the kimchi in the form that the upper surface is opened in the inner side of the 100, the upper opening and closing door 110 for selectively opening and closing the kimchi storage room 120, and the kimchi storage room 120 ) Is provided as a separate space and provided with a wine storage room 140 for storing wine in the form of the front opening, the front opening and closing door 130 for selectively opening and closing the wine storage room 140, and the kimchi storage room A display unit 150 for displaying various operations and operating conditions for temperature control in the 120 and the wine cellar 140 is provided.

Here, in the main body 100, a machine room 160 in which a compressor 161, a condenser 162, etc., in addition to the kimchi storage room 120 and the wine storage room 140 are installed is provided, and the machine room 160 is provided. A refrigerant system is circulated between the compressor 161 and the condenser 162 and the evaporators 163 and 164 wound on the outer circumferential surfaces of the kimchi storage chamber 120 and the wine storage chamber 140 to cool the inside of the refrigerator.

That is, evaporators 163 and 164 through which refrigerant may flow are installed on the outer circumferential surfaces of the kimchi storage compartment 120 and the wine storage compartment 140, respectively, so that the evaporators 163 and 164 of the kimchi storage compartment 120 and the wine storage compartment 140 are provided. Since it is integrally mounted on the outer circumferential surface and in contact with the kimchi storage chamber 20 and the wine storage chamber 40, the cold air can be supplied to each of the kimchi storage chamber 20 so that the kimchi can be stored for a long time. It can be stored at an appropriate temperature.

At this time, the kimchi storage room 120 and the wine storage room 140 is configured by the in-case (121, 141) manufactured in the shape of an empty box.

In particular, the case 141 constituting the wine cellar 140 is formed as a single storage space whose front surface is opened by injection.

Therefore, the wine storage room 140 has a structure that can accommodate and store the wine bottle 170 as the front portion of the main body 100 is opened and closed by the front opening and closing door 130, preferably the wine bottle ( 170) is laid so that it can be stored lying down.

As described above, the wine storage chamber 140 has a structure formed long in the vertical direction on one side of the main body 100 so as to be laid down one by one in consideration of the characteristics of the wine bottle 170 and stored sequentially over the upper and lower ends.

In this case, a plurality of wine racks 180 are installed along the height direction of the wine storage room 140 so that the wine bottles 170 may be individually stored in the wine storage room 140, and the wine rack 180 is wine It is preferable that the slide rails are formed on both side walls of the storage chamber 140 so as to slide in and out to the front.

Meanwhile, the front open / close door 1300 selectively opens and closes the opening of the wine storage room 140, and serves to maintain the airtightness in the wine storage room 140, as described above. On one side of) is installed to rotate back and forth, as shown on the drawing.

However, the kimchi storage provided with the wine cellar 140 according to the prior art as described above has the following problems.

In the state in which the wine cellar 140 is closed by the front opening / closing door 130, the user is not able to directly check the inside of the wine cellar 140 by eye.

That is, in the case of wine, as well as withdraw the wine bottle 170 from the wine cellar 140, and also when checking the type and quantity of wine, the front opening and closing door 130 of the wine cellar 140 must be opened frequently The problem is that wine is difficult to keep in optimal condition.

Thus, even without opening the front open / close door 130 of the wine cellar 140, in order to check the interior of the wine cellar 140 to the inside of the wine cellar 140 to the inside of the glass door is equipped with a glass Applicability has been proposed.

Of course, in applying the insulating glass door as described above, the front surface is designed to be equipped with tempered glass that can make use of the luxury of the product in terms of design and visual aspects while having excellent durability.

In this case, when the glass is mounted on the insulating glass door as described above, it is necessary to consider the insulation aspect along with the appearance of luxury, so by arranging the glass in double or triple layers, an air layer is formed in the space between the glass and the glass, thereby providing high temperature. Depending on the conditions, it is designed to minimize heat loss.

That is, as shown in Figures 3 to 5 as an embodiment of the front openable door shown in Figure 1, there is shown a heat-insulating glass door to obtain a heat insulation effect by arranging the glass in triple, below the front open door Looking at the configuration of the insulating glass door showing an embodiment of the in detail.

At this time, the insulating glass door is shown in relation to one embodiment of the front opening door, the same reference numeral 130 as the front opening door 130 will be written together.

As shown in Figures 3 to 5, the conventional insulating glass door 130, the through-hole 132 that can be mounted to the glass to form a door appearance and to see the inside through the insulating glass door 130 ) Is provided at the central portion of the door frame 131, a transparent window 133 consisting of a plurality of glass 134 is mounted to the through-hole 132 double or triple, and the transparent composed of the plurality of glass 134 A transparent cover 135 covering the front surface of the window 133, a support fixing member 136 for supporting and fixing the transparent cover 135 in the door frame 131, and a circumference around the rear surface of the door frame 136. Gasket 137 is mounted along the, and the inner side of the door frame 131 is composed of a heat insulating material 138 wrapped around the four sides and disposed between the transparent cover 135 and the transparent window 133.

Here, the transparent window 133 serves to allow the user to check the interior of the storage compartment, and is configured to be coupled to the through-hole 132 formed in a rectangular frame shape on the door frame 131.

At this time, the transparent window 133 is preferably made of a structure in which a plurality of glass 134 is overlapped so as to enhance the durability and heat insulation effect, more preferably a triple glass structure.

The plurality of glasses 134 constituting the transparent window 133 are arranged in a double or triple as described above, in this case, the interval between the four sides of the glass 134 and the glass 134 made of metal The holding member 139 is inserted.

That is, the air layer (S) is provided between the glass 134 and the glass 134 is designed to minimize the heat loss through the transparent window 133, in this case, the gap maintaining member 139 is made of metal The reason for this is that there is no choice but to use it in order to maintain the durability between the glass 134 with the improvement of durability.

The transparent cover 135 is disposed in front of the door frame 131 to form the front surface of the door frame 131.

At this time, the transparent cover 135 is preferably made of a durable tempered glass.

In addition, the transparent cover 135 is preferably printed so that the front appearance of the door frame 131 can be seen beautifully within the range that does not shield the transparent window 133, and the overall appearance of the kimchi storage and More preferably, a harmonious pattern is printed.

On the other hand, the heat insulating material 138 installed between the transparent cover 135 and the transparent window 133 is to obtain a heat insulating effect according to the change in the temperature inside the air with the blocking of the outside air.

At this time, the heat insulator 138 is disposed to contact the back of the transparent cover 131 while surrounding the four sides of the transparent window 133 in the interior of the door frame 131, it is preferable that the insulation material such as styrofoam, but It is not limited.

The support fixing member 136 serves to support and fix the transparent cover 135 to the door frame 131 after the heat insulator 138 and the transparent cover 135 are disposed in the door frame 131.

That is, after the transparent cover 135 is disposed on the door frame 131, the support fixing member 136 surrounds the edge of the door frame 131 and is assembled to support the transparent cover 135.

The gasket 137 is installed to protrude along the circumference of the through-hole 132 from the back of the door frame 131 is installed to maintain the airtightness of the storage compartment in accordance with the opening and closing of the insulating glass door 130, a rubber material As it is molded of silicone material or compressed elastically, it is installed to increase the airtight effect.

However, in the case of the conventional insulating glass door 130 having the above structure, the metal gap maintaining member 139 to firmly support and fix the gap between the plurality of glass 134 constituting the transparent window 133 When the cold cold in the interior is heat conduction through the transparent window 133, there is an insulating effect in the air layer (S) between the glass 134 and the glass 134 to block heat transfer, but the cold air The transparent cover 135 in direct contact with the glass 134 on the front surface of the transparent window 133 after the heat conduction directly through the metal gap holding member 139 between the glass 134 and the glass 134. There is a problem that dew condensation occurs in the front of the transparent cover 135 due to the temperature difference between the outside air and the cold air at the contact portion (A) as the heat conducts up to).

An object of the present invention was devised to solve the above problems, the object of the present invention is equipped with a double or triple glass to check the interior of the wine cellar even if the door of the wine cellar provided in the kimchi storage is not open. When the door is composed of a single door, the dew condensation prevention structure of the insulating glass door to prevent the dew condensation phenomenon occurs on the outer surface of the glass door according to the temperature change in the high temperature.

In order to achieve the above object, the present invention provides a door frame for forming a door appearance, a plurality of glass is installed in the door frame through a metal gap maintaining member double or triple disposed between the transparent window, the front of the transparent window Insulating glass door including a transparent cover disposed on the front of the door frame while covering, blocking the heat transfer from the transparent window to the transparent cover by the heat conduction transmitted through the gap holding member disposed between the plurality of glass In order to provide a dew preventing structure of the insulating glass door, a second insulating material is inserted and disposed at a portion where the transparent cover and the glass of the transparent window come into contact with each other along the position line where the gap maintaining member is disposed.

Here, it is preferable that another heat insulating material is further disposed inside the door frame so as to surround the four sides of the transparent window and block heat transfer in contact with the rear surface of the transparent cover.

The transparent cover is preferably tempered glass.

In addition, it is preferable to opaque only the back portion of the transparent cover to be in contact with the heat insulating material so that the heat insulating material in contact with the back of the transparent cover is not visible from the outside.

Hereinafter, with reference to the accompanying Figures 6 to 8 will be described in the preferred embodiment of the present invention.

Figure 6 is a rear view showing the insulating glass door according to an embodiment to which the present invention is applied, Figure 7 is a cross-sectional view taken along line CC of Figure 6 showing the configuration of the insulating glass door according to the present invention, Figure 8 is the present invention 6 is a cross-sectional view taken along the line DD of FIG. 6 showing the configuration of the insulating glass door.

Prior to explaining the present invention according to the accompanying drawings, a preferred embodiment of the present invention, as described in the prior art to configure the front opening and closing door to open and close the wine cellar in the kimchi cellar equipped with a wine cellar as a heat insulating glass door It is preferably applied when, but is not limited thereto.

In other words, when the insulation glass door is used in a general refrigerator, kimchi storage, wine storage, etc., as the cold air is provided in the interior of the product, dew condensation occurs on the front surface of the insulation glass door according to the temperature difference between the cold interior and the outdoor air. Naturally, the present invention is applicable.

Therefore, in describing the present invention, the insulating glass door applied to the kimchi cellar equipped with the wine cellar described in the prior art will be described as an embodiment. Some of the components not shown in the drawings in the description of the glass doors will be described with reference to the drawings attached to the prior art, together with the reference numerals of the components shown in the prior art.

As shown in Figure 6, the insulating glass door (1) to which the present invention is applied, one of the doors installed to open and close the wine cellar 140 in the kimchi cellar equipped with the wine cellar 140 as seen in the prior art. Example.

The insulating glass door 1 according to the embodiment as described above is composed of a door equipped with double or triple glass so that the inside of the storage compartment can be checked even when the door is not opened, the insulating glass door ( 1) comprises a door frame 10, a transparent window 20, a transparent cover 30, a support fixing member 40, a gasket 50, the first and second heat insulating material (60, 70) Has

Hereinafter, the configuration of the insulating glass door to which the present invention having the above configuration is applied will be described in more detail with reference to FIGS. 7 and 8.

As shown in the figure, the door frame 10 of the components constituting the insulating glass door (1) forms the appearance of the insulating glass door (1) as a whole, the wine cellar 140 as seen in the prior art It is preferably made in the form of a square similar to the appearance of.

At this time, the central portion of the door frame 10 is formed through a heat insulating glass door (1) is formed through a square frame-shaped through-hole 11 to check the interior of the storage compartment, such as the wine storage chamber 140.

In addition, bent parts 12 for coupling the support fixing member 40 are formed at both circumferential surfaces of the door frame 10.

The bent portion 12 is formed along the circumferential surface of the door frame 10, respectively, and has a structure that is engaged with each other by the support member 40.

Meanwhile, a gasket assembly 13 is formed along the periphery of the through hole 11 on the rear surface of the door frame 10, that is, the surface facing the wine storage chamber 140.

The gasket assembly 13 has a structure in which a gasket 50 to be described later may be fitted in order to maintain the airtightness of the storage compartment. The gasket assembly 13 according to the present exemplary embodiment may include the gasket ( 50) is preferably formed in the form of a partition along the rear circumference of the door frame 10 to increase the airtight effect of the storage compartment.

At this time, the gasket 50 installed in the gasket assembly 13 is installed to protrude around the rear surface of the door frame 10, thereby keeping the airtightness of the storage compartment while being in close contact with the pressing force when the insulating glass door 1 is closed. It is preferable that the gasket 50 is formed of a rubber material or a silicone material that can be elastically compressed and installed to increase an airtight effect.

Of course, the shape of the gasket 50 can be variously changed depending on the assembly form and the structure of the gasket assembly 13, and the like.

In addition, a mounting groove 14 is formed on the front surface of the door frame 10 so that the first insulating material 60 to be described later is seated.

In addition, the transparent window 20 serves to allow the user to check the interior of the storage compartment, and is configured to be coupled to the through-hole 11 formed in a rectangular frame shape of the door frame 10.

At this time, the transparent window 20 is preferably made of a structure in which a plurality of glass 21 is superimposed so as to enhance the durability and heat insulation effect, more preferably a triple glass structure.

That is, the plurality of glass 21 constituting the transparent window 20 is to be arranged in double or triple, in this case, the interval maintaining member made of metal on the four circumferential surface between the glass 21 and the glass 21 22 is inserted.

As such, as the gap maintaining member 22 is disposed between the glass 21 and the glass 21 to maintain a constant gap, an air layer 23 is formed between the glass 21 and the glass 21. As such, the air layer 23 is formed, so that the heat loss through the transparent window 20 can be minimized as the air layer 23 performs a heat insulation function.

Here, the reason why the gap holding member 22 is made of metal is that it is inevitably used to maintain the gap between the glass 21 while improving durability.

On the other hand, the transparent cover 30 disposed in front of the transparent window 20 forms the front of the door frame 10, it is disposed in front of the door frame 10.

At this time, the transparent cover 30 is preferably made of a durable tempered glass.

In addition, the transparent cover 30 is preferably printed in a pattern or the like so that the appearance of the insulating glass door 1 can be seen beautifully within the range that does not shield the transparent window 20, in harmony with the overall appearance of the product It is more preferable that the pattern forming the print.

On the other hand, according to the present invention, between the transparent cover 30 and the transparent window 20, the first and second insulating material (60, 70) is installed so as to obtain a heat insulation effect according to the temperature change in the high temperature with the blocking of the outside air. Will be.

Here, the first insulation 60 is disposed in the seating groove 14 formed on the front of the door frame 10 to surround the four sides of the transparent window 20, as well as the back of the transparent cover 30 In contact with heat shielding.

In addition, the second insulating material 70 is in contact with the transparent cover 30 and the foremost glass 21 of the transparent window 20 along a position line where the gap maintaining member 22 in the transparent window 20 is disposed. By being inserted into the portion to be made, it serves to block the heat transfer directly from the transparent window 20 to the transparent cover 30 by the heat conduction transmitted through the gap holding member 22.

That is, as described in the related art, when the insulating glass door 1 is designed in a structure in which the transparent cover 30 and the glass 21 in front of the transparent window 20 are in direct contact with each other, cold cold inside the When the heat conduction through the transparent window 20, there is an insulating effect in the air layer 22 between the glass 21 and the glass 21 to block heat transfer, but between the glass 21 and the glass 21 After the cold air is directly heat-conducted through the gap holding member 22 of the metal, the contact portion as the cold air is heat-conducted to the transparent cover 30 which is in contact with the glass 21 of the front of the transparent window 20 Due to the temperature difference between the outside air and the heat-conducted cold air, dew condensation may appear on the front side of the transparent cover 30.

Therefore, in order to solve the above problem, the glass and the transparent cover 30 of the transparent window 20 are directly disposed on the second heat insulating material 70 on the position line where the gap maintaining member 22 is disposed. By inserting and placing in contact with the portion, the heat transfer by the direct heat conduction between the transparent cover 30 and the transparent window 20 is to increase the thermal insulation effect.

At this time, it is preferable to use a material such as styrofoam, which is commonly used in the art, as the first and second insulating materials 60 and 70, but is not limited thereto.

In addition, since the transparent cover 30 is made of a transparent material projected from the outside, such as tempered glass, the first and second insulating materials 60 and 70 which come into contact with the rear surface of the transparent cover 30 are Bars may be exposed to the outside through the transparent cover 30 as it is, in the present invention, the first and second heat insulating materials 60 and 70 as described above are exposed to the outside to prevent the external appearance from falling off. It is preferable to opaquely process the back part of the transparent covers 60 and 70 which the 1st and 2nd heat insulating materials 60 and 70 contact.

Here, as a method of opaque treatment of a portion of the transparent cover 30, a well-known coating method or a well-known coating method may be applied, as well as a variety of well-known methods may be applied.

On the other hand, the support fixing member 40 after the transparent window, the first and second heat insulating material (60, 70) and the transparent cover 30 are sequentially disposed in the door frame 10 to the transparent cover 30 It serves to support and fix the door frame (10).

That is, since the support fixing member 40 is assembled by engaging the bent part 12 formed on the circumferential surface of the door frame 10 after the transparent cover 30 is disposed on the door frame 10. The transparent cover 30 is fixed and supported.

Hereinafter, the assembly process of the insulating glass door to which the present invention having the configuration as described above is applied will be described schematically.

First, when the transparent window 20 having a structure in which a plurality of glasses 21 are arranged at a predetermined interval through the metal gap maintaining member 22 and the air layer 23 is formed therein is prepared, the door frame ( 10) The transparent window 20 is inserted into and fixed to the through-hole 11 formed in the form of a square frame.

At this time, the transparent window 20 may be coupled to the interference fit in the through hole 11, it may be fixed by a separate fastening means.

Next, the first insulation 60 is seated in the seating groove 14 of the door frame 10.

At this time, the first heat insulating material 60 and the transparent window 20 are arranged side by side at the same height with respect to the back surface of the transparent cover 30 in the door frame 10, thereby forming a flat same surface with each other.

Then, the second insulating material 70 is disposed along the four corners of the glass 21 located on the front of the transparent window 20.

That is, the second insulating material 70 is disposed on the glass of the transparent window 20 along the position line where the gap maintaining member 22 in the transparent window 20 is disposed.

As a result, the first heat insulating material 60 and the second heat insulating material 70 are arranged in close proximity to each other, but have a structure that does not contact each other, the second heat insulating material 70 as a whole compared to the first heat insulating material 60 In addition to the small size, as shown in the drawing, the second heat insulating material 70 has a layout structure in which the first heat insulating material 60 is relatively located inside the first heat insulating material 60.

In this way, the transparent cover 30 is disposed on the front surface of the door frame 10 in a state where the first and second insulation materials 60 and 70 are disposed.

Then, by assembling and fastening the support fixing member 40 to the bent portion 12 of the door frame 10, the transparent cover 30 is coupled to be firmly fixed in the door frame 10. .

Of course, the gasket assembly 13 formed on the rear surface of the door frame 10 is assembled by fitting the gasket 50 or by fixing it by a separate adhesive means, thereby completing the assembly of the insulating glass door 1.

The insulating glass door 1 is assembled as described above is rotatably installed on one side of the front side of the wine cellar 140 shown in the prior art, so that the front opening and closing door for opening and closing the front opening of the wine cellar 140. It will perform the function.

Although the above description has been described by means of a limited embodiment and the drawings, the present invention is not limited thereto, and dew condensation occurs on the surface of the insulating glass door 1 in each product requiring the insulating glass door 1. In the case of appearing, the present invention can be applied anywhere, and various modifications and variations can be made by those skilled in the art within the technical scope of the present invention and the equivalent scope of the claims to be described below. I can understand.

As described above, according to the present invention, when constructing an insulating glass door including a transparent cover made of tempered glass, a transparent window made of double or triple glass so that the inside of the storage compartment can be checked even when the door is not opened. By blocking the direct contact between the transparent window and the transparent cover through the heat insulator to prevent heat from being transferred to the transparent cover through the transparent window, dew condensation occurs on the outer surface of the insulating glass door according to the temperature change in the high temperature. There is an effect that can be prevented from occurring.

Claims (4)

A door frame forming a door exterior, a plurality of glass is installed in the door frame is disposed in the double or triple through the metal gap holding member, and is disposed on the front of the door frame while covering the front of the transparent window In the insulating glass door comprising a transparent cover, The glass of the transparent cover and the transparent window is located along the position line where the gap maintaining member is disposed to block heat transfer from the transparent window due to heat conduction transmitted through the gap maintaining member disposed between the plurality of glasses to the transparent cover. Dew condensation preventing structure of the insulating glass door, characterized in that the second insulation is inserted into the portion to be contacted. The method of claim 1, Wrapping around the four sides of the transparent window and adjacent to the second heat insulating material, the first heat insulating material is disposed inside the door frame to block heat transfer in contact with the back of the transparent cover, characterized in that the dew condensation structure of the glass door. The method according to claim 1 or 2, The transparent cover is a dew condensation preventing structure of the insulating glass door, characterized in that the tempered glass. The method of claim 2, The frost-resistant structure of the insulating glass door, characterized in that the opaque treatment of only the rear portion of the transparent cover to contact the first and second heat insulating material so that the first and second heat insulating material in contact with the back of the transparent cover is not visible from the outside.

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