KR960002575B1 - Thermal insulation box - Google Patents

Abstract

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Description

Thermal insulation box

1 is a perspective view of a heat insulation box showing an embodiment of the present invention.

2 is a front view of FIG.

3 is a schematic perspective view of using an insulating box as a business refrigerator.

4 is a cross-sectional view taken along the line A-A of FIG. 2 in the box before filling the foam insulation.

FIG. 5 is a sectional view taken along the line B-B in FIG. 2 in the box after filling the foam insulation. FIG.

6 is a partially cutaway perspective view illustrating the intersection of the compartments.

Figure 7 is a schematic exploded perspective view showing the connection portion of the partition body and the inner and outer aspects of the body.

8 is a perspective view of the combination of FIG.

9 is a cross-sectional view showing the exhaust hole portion of the outer shell material.

10 is a perspective view showing the exhaust hole portion of the outer shell material.

11 is a perspective view for explaining foaming onto a box.

12 is a partially cutaway perspective view of FIG.

13 and 14 are some cutaway perspective views showing another embodiment of the present invention.

FIG. 15 is a side sectional view of the business refrigerator shown in FIG.

Figure 16 is an exploded perspective view of the process showing the manufacturing step of the inner box main body.

FIG. 17 is an exploded perspective view of an inner box capable of assembling a ceiling plate bottom plate to an inner box body.

18 is a side cross-sectional view of the inner box.

19 is a cross-sectional view of the refrigerator body assembled with an outer box and filled with foam insulation.

20 is an exploded perspective view of a conventional inner box.

* Explanation of symbols for main parts of the drawings

1: insulation box 2: inner box

3: outer box 4: space

5: insulation material 6: insulation box

7 opening 8 heat insulation partition

9: decorative plate 10: flange portion

11: end 12: hollow

13: outer shell 15: heat insulating material

16: front circumference 17: front

18: heat insulation door 19: packing

21: front panel 22: rear panel

23: decorative plate 24: flange portion

25 fins 26 flange portion

30: connecting member 32: holding part

33: insertion part 35: fixing part

40: connecting member 41: first contact portion

42: second contact portion 43: insertion portion

52: screw 61: injection hole

62: exhaust hole 64: breathable member

65: lid 70: wall

80: single wall 96: compressor

97: blower 98: condenser

99: evaporator 100: fan

101: cover 102: shelf

105: metal plate 106: metal plate

107: cutting plate 108: cutting plate

110: V-shaped flange 111: bending flange

112: flange face 113: flange face

114: ceiling plate 115: bottom plate

116: drain hole

The present invention relates to a heat insulating box having a structure in which a heat insulating material is foam-filled in a space between an inner box and an outer box. In particular, the inside of the heat insulating box is divided into a plurality, and has a plurality of storage compartments. It is related with the insulation box made in the form.

A conventional refrigerator, for example, a business refrigerator installed in a kitchen such as a restaurant is provided with a plurality of storage rooms in order to be able to store a large amount of food. In order to set it as the storage provided with such a storage chamber, it is necessary to provide the heat insulation partition body which partitions the opening part of a storage cell into a some opening part in a front opening part. Then, opening and closing doors are fired in each of the openings to produce a storage bin.

As a prior art relating to such a partition structure of a storage, there is, for example, Japanese Unexamined Patent Publication No. 60-5785. The partition structure described in this publication is provided by directly bonding the front plate of which the cross-section provided in the partition body is substantially C-shaped, the heat insulating material provided in the space part of the front plate, and the rear end and the outer surface of the front plate. And a cover body having an approximately c-shaped cross section, and the cover body is fitted to the front plate.

Here, as shown in FIG. 2 of the above publication, the heat insulating partition body is composed of the front plate, the heat insulating material, and the cover body, and further, the heat insulating material is assembled so that the heat insulating material is interposed between the front plate and the cover body to be one. The openings of the storage cell in which the foaming work has been performed are finished by fixing members such as screws to divide the openings into a plurality of partitions. Therefore, there is a problem in that the storage of the foaming work requires a work step of assembling the insulating partition body, which increases the number of working steps and increases the number of parts.

In addition, in assembling, since it is difficult to closely adhere the heat insulating material of the compartment and the heat insulating material of the cellar, the heat insulating performance of the heat insulating material constituting the cellar and the heat insulating performance of the heat insulating material of the compartment are likely to be different, so that the heat insulating performance of the entire cellar is uniform. There is a problem that cannot be done, and consequently, condensation may occur partially. Particularly, when a part of the storage room is used for freezing, when condensation forms on the partition, the contact part of the insulating door joined to the front of the partition may freeze by cooling, making it difficult to open the door, or the door may not be opened. there was.

In addition, since the partition wall surface is not in close contact with the heat insulating material, the strength of the opening portion becomes weak compared to other portions, so that the thickness of the partition outer wall surface is increased, the material of the plate is changed, and the assembly fixing is performed. It was necessary to improve the strength of the opening portion, such as using a reinforcing member.

Thus, the thermal insulation box is formed by foaming and filling the insulating material in the space between the inner box and the outer box, but generally the outer box is formed of a stainless steel sheet, and the inner box is formed of a thin steel sheet.

FIG. 20 shows a prior art in which a thin steel plate is combined to form an inner box.

Referring to the drawings, the inner box is formed of five surfaces of the three plates of the electric plates 90a and 90b, the left and right side plates 91 and 92, the back plates 93a and 93b, and the bottom plate 94. It consists of sheet metal. In this case, since the height (height) or width of the household refrigerator is small, it can be taken within the width of the material of the metal member, but the height of the inner box, such as the commercial refrigerator shown in FIG. Beyond the limit of the material width length, as shown in FIG. 20, the back plates 93a and 93b use two metal members, thereby increasing the material acquisition. In addition, the joining of the sheet metals is performed by stitch fixing or screw fixing. In addition, instead of screw fixing, there is also a machining method for joining each sheet metal by caulking. For example, as shown in Japanese Unexamined Patent Application Publication No. 44-5415, it is a method of constructing an inner box by caulking the attachment portion between the back plate and the wall plate.

However, if the material is obtained from the inner box as shown in Fig. 20, a large amount of sheet metal is required, resulting in high cost. Moreover, since the joining of each sheet metal is performed by stitch fixing and screw fixing, there are many processes. In addition, the finished inner box is difficult to clean in the inner box because each corner portion is at a right angle. Therefore, bending R must be formed in the back plate or the side plate to make the structure easy to clean, and it took a lot of process water and time.

On the other hand, in Japanese Unexamined Patent Application Publication No. 44-5415, in the injection of urethane foam, it is injected between an appropriate place of the space between the inner box and the outer box, for example, between the wall plate on the left side and the outer box part opposite to this. At this time, the urethane plate flows in the right direction to fill the space area corresponding to the back plate and the wall on the right side, but at this time, the joining flange of the caulking portion protrudes in the transverse direction, so that the spreadability (flowing) after the urethane plate injection may be impaired. There is.

This invention is made | formed in view of the above point, The 1st objective is to provide the heat insulation box which made the heat insulating material of a heat insulation box, and the heat insulating material of a partition body consist of a series of foam heat insulating materials.

Its second object is to provide an inner box structure of the heat insulation box which is improved in material cost, processing process water, and heat insulating material injection work.

In order to achieve the object of the present invention, the heat insulating box body of the present invention is provided with a heat insulating partition body that partitions the opening in an opening of the heat insulating box that foam-fills the heat insulating material in the space between the inner box and the outer box. In one embodiment, the insulating partition body is covered with an outer shell material so that the end portion thereof communicates with the space at the opening and is entirely hollow, and the heat insulating material disposed in the hollow portion of the partition and the heat insulating material disposed in the space portion of the thermal insulation box are a series of It is characterized by consisting of a foam insulation.

According to this configuration, since the insulating partition body is covered with the outer shell so that the entire end is in communication with the space between the inner and outer shells at the opening, the outer shell is part of the thermal insulation material foam-filled in the space between the inner and outer shells. It acts as a heat insulator guide pipe leading to the hollow part of the partition body. For this reason, a heat insulation box and a partition body are comprised by a series of foam insulation, and the heat insulation performance over the whole heat insulation box can be made uniform.

Moreover, since the heat insulating material of a space part and the heat insulating material of a hollow part are comprised of a series of foam heat insulating materials, since the strength as a heat insulation box body improves, and the heat insulation box body with a heat insulation partition body is completed with foaming completion | finish, The assembling work becomes easy.

In addition, the present invention is a heat insulating box of the configuration in which the insulation between the inner box and the outer box foam-filled in the space, each having a pair of incisions on each side edge in the longitudinal direction, both sides edge bent to include this incision A metal flat plate having a flange of both sides having a V shape, one side edge having a V shape flange, and the other side edge having a right angle flange. Inner box in which the back plate and the left and right side plates are integrally bent by bending each other inward from each other in the connecting line to form a c-shape, facing the short-lived sides of the bimetal plate, and fitting a V-shaped flange and a right angle flange. A main body is formed, and the peripheral edges of the ceiling plate and the bottom plate are formed on each of the V-shaped flanges located above and below the inner box main body. Words put and characterized by forming the inner box in conjunction coking.

According to this constitution, the inner box main body in which the back and the left and right side plates are integrally formed by bending two horizontally long metal plates in a U-shape and joining them to each other in opposite cross sections and by coking the opposite parts. Can be configured. Therefore, as in the prior art, the back plate and the left and right side plates do not need to be independently obtained, so that the number of parts and the number of assembly steps can be reduced. The bent part is R-shaped due to the presence of the incision formed there, and is not at right angles. Therefore, the corner part in the inner box completed by caulking the ceiling plate and the bottom plate to the upper and lower parts of the inner box main body is also cleaned. It is made easy. Then, the R shape of the corner portion and the joining flange are not provided at the corner portion to ensure smooth spreading (flowing) of the urethane so that foam filling of the heat insulating material can be effectively performed.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of 1st invention is described based on drawing.

The thermal insulation box 1 is formed by foaming and filling the insulation 5 into a space 4 formed between a metal inner box 2 and an outer box 3 having excellent corrosion resistance, such as stainless steel, for example. (6) and the thermal insulation partition body 8 which divides this opening part 7 in multiple numbers in the opening part 7 for goods access formed in one surface (front surface in this example) of this heat insulation box 6, and is formed That's what happens.

The insulating partition 8 is covered with an outer portion 13 whose end portion 11 communicates with the space 4 in the opening 7 and forms a hollow 12 in its entirety. The heat insulating material 5 of the part) and the heat insulating material 15 of the said hollow 12 part are comprised from a series of foam heat insulating materials. In addition, in the present Example, the heat insulation partition body 8 is comprised so that the opening part 7 may be divided into four substantially + shape. Q is an opening for inserting and fixing the cooling device for cooling the storage chamber R.

3 shows the case where this heat insulation box body is used for the business refrigerator G, The circumferential front surface 16 of the opening part 7 of the heat insulation box 6, and the front surface 17 of the heat insulation partition body 8 are shown. And the packing 19 containing the magnets turned around the back circumference of the heat insulating door 18 in contact with the positive front surface 16, 17, and the heat insulating door 18 and the heat insulating box. While maintaining (6) in a sealing relationship, one storage chamber R in communication with each other is formed.

The outer material 13 of the heat insulation partition body 8 has the cross-sectional structure as shown in FIG. 9, and the metal front plate 21 and partition body which comprise the front surface 17 of the partition body 8 are shown. With the back plate 22 made of metal constituting the back side of 8) and the front and rear double-sided plates 21 and 22, and the decorative plate 22 made of resin constituting both sides and the top and bottom of the partition body 8, The hollow 12 having a rectangular cross section is formed in. The makeup plate 23 has a first recess 23A which receives the flange 24 extending to the side of the front plate 21. At the same time, the second recess 23B is formed to receive the flange portion 26 extending to the side surface of the rear plate 22. The second recess 23B receives the flange portion 26. As shown in FIG. The flexible fin piece 25 is formed so that the flange part 26 may be firmly fitted at the time, and the edge part of the inner box 2 and the flange part 10 of the outer box 3 are formed. Are connected by a screen pad (9) has the same cross-section as the above-described screen pad (23).

The cross section of the heat insulating partition body 8 is connected to the front face plate 21A in the longitudinal direction and the horizontal face plate 21B by the connecting member 30 as shown in FIG. The rear plate 22A in the longitudinal direction and the rear plate 22B in the horizontal direction are connected by the fixing member so as to intersect in a + shape. And the flange part 24, 26 of the front and back both boards which are replaced by the makeup board 23 is connected, and the hollow which cross | intersects with a + character is formed.

The connecting member 30 connects the base 31, the two retaining portions 32, the base 31 and the retaining portion 32, and is a flange portion of the front plate 21A and 21B in both the longitudinal and horizontal directions. And an insertion section 33 for inserting the 24 into each. In addition, the flange portion 24 is formed with an incision 27 to avoid the insertion portion 33 at the time of connection. In the holding portion 32, a fixing portion 35 is formed, and the fixing portion 35 is connected to the flange portion 24 by screws or the like by a fixing member.

On the other hand, the whole connection part of the heat insulation box 6 and the heat insulation partition body 8 is the flange part 10 of the outer box 3 by the connection member 40 as shown to FIG. 7 and FIG. The end 11A of the front plate 21 is connected to the peripheral edge of the inner box 2 and the end 11B of the back plate 22 by fixing members such as screws.

The connecting member 40 has a first contact portion 41 in contact with the inner surface of the outer box front face 16, a second contact portion 42 in contact with the inner surface of the front plate 21, and both contact portions 41 ( And an insertion portion 43 for connecting and holding 42 the flange portion 10 of the outer box 3 and the end portion 11A of the front plate 21. In addition, the flange 10 of the outer box 3 is formed with an incision 10B which avoids the insertion portion 43.

Next, the assembling and connection of the inner and outer side facers 2 and 3 and the outer member 13 will be described.

First, the connection member 40 is fixed with the screw 51 so that the opening side of the insertion portion 43 faces outwardly in place of the flange portion 10 of the outer box 3, and at the same time, the rear plate in both longitudinal and horizontal directions ( 22A) and 22B are connected in a + shape. The four ends 11B of the + -shaped back plate are fixed to the opening edge of the inner box 2 with screws 52. The inner box 2 is then inserted into the outer box 3 by sliding from the bottom wall side.

On the other hand, the front plates 21A and 21B in both the longitudinal and horizontal directions are connected in a + shape using the connecting member 30 and the screws, and each flange portion 24 is the first recessed portion 23A of the decorative plate 23. The decorative plate 23 is attached so as to be accepted.

Then, the flange portion 26 of the rear plate 22 is received in the second recess 23B of the decorative plate 23 so as to cover the + -shaped front plate on the rear plate and at the same time, the + -shaped front plate. 11A of four end parts are respectively inserted in the insertion part 43 of the connection member 40, and the bottom wall of an outer box is fixed. Moreover, the decorative board 9 is arrange | positioned so that the edge part of the inner and outer side edgers 2 and 3 may be extended.

In this way, the inner and outer sheaths 2 and 3 and the outer shell 13 are connected to each other, and the box body 1A in which the four spaces between the inner and outer shells and the hollow 12 portion of the outer shell 13 communicate with each other. Complete the assembly of the).

Next, the filling of the foam insulation material 5 by SF foaming method (for details, see Japanese Patent Application Laid-Open No. 61-35462) to the box 1A will be described with reference to FIGS. 11 and 12. do.

First, the box body 1A is fixed to a foam jig (not shown) heated to a predetermined temperature with the opening 7 facing the upper surface.

Then, a predetermined amount of foam stock is injected from the injection hole 61 formed in the ceiling wall of the box 1A. The injected stock solution starts to grow in sequence from the first point of arrival, that is, from the rear of the bottom wall of the box 1A (in this case, the bottom), and gradually flows into the space 4 to form the foam insulation 5 in the space 4. It is charged as. When the heat insulating material which flowed into this space reaches to the position where the opening part 7 is located, it is led to the hollow 12 part which communicated with the space 4, and is filled in a hollow part. In addition, the foaming gas and the air generated in the space 4 and the hollow 12 generated by the growth of the foaming stock solution are formed in the exhaust hole 62 and the ceiling wall formed in the rear plate 22 of the partition plate 8. It is discharged | emitted from the exhaust hole 63 formed outside. However, the ventilation holes 64 are disposed from the inside in order to prevent the leakage of the heat insulating material and exhaust the heat in the both exhaust holes 62 and 63, and after the foaming ends, the plug 65 blocks the plugs. do. Therefore, the exhaust hole 62 formed in the back plate 22 of the partition body 8 acts as a window for confirmation for confirming that the heat insulating material 15 is filled in the hollow 12 portion of the outer material 13. Very much available.

After removing the foam jig, the foaming work of the box 1A is completed, and the heat insulation box 1 with the heat insulation partition body 8 is completed.

The case where there is one storage compartment which divides only the opening part 7 into the heat insulation partition body 8 by the above embodiment is demonstrated.

As shown in FIG. 13, only the storage compartment part (the upper left part in this figure) located behind one of the four compartment openings is partitioned by the other storage compartment part and the wall 70. However, as shown in FIG. 14, the present invention is also applicable to a structure in which the heat insulation wall 80 is connected to the rear portion of the longitudinal partition 8 so as to form two storage chambers on the left and right sides. Do. In this case, the wall 70 or the heat insulation wall 80 is also composed of a series of foam insulation.

According to the configuration as described in detail above, the heat insulating partition body 8 has its end 11 in communication with the space 4 between the inner and outer cartons 2 and 3 at the opening 7 and the hollow 12 as a whole. As part of the outer material 13 covered with the outer material 13, the outer material 13 itself is foamed and filled in a part of the space 4 between the inner and outer facets 2 and 3, and the partition body ( It acts as a guide pipe leading to the hollow 12 part of 8).

For this reason, the heat insulation box 6 and the partition body 8 consist of a series of foam insulation materials, and the heat insulation performance over the whole heat insulation box 1 can be equalized, and it concentrates on the part of the partition body 8, Dew does not form.

Moreover, since the heat insulating material of the space 4 part and the heat insulating material of the hollow 12 part consist of a series of foam heat insulating materials, the intensity | strength as the heat insulation box 1 improves, and a heat insulation partition body comes with the completion of foaming work. (8) Since the heat insulation box 1 with attachment is completed, the assembling work is performed easily.

Moreover, when the single partition body is joined to the box after the end of foaming, it is very bad in appearance because the fixing member is located at the outer side in the attachment thereof, but according to the present invention, the fixing work is removed at the same time. You can prevent it from being located.

Next, 2nd invention is demonstrated based on FIG. 15 thru | or FIG.

In the external perspective view of the commercial refrigerator which has the storage chamber R of four rooms shown in FIG. 3 mentioned above, and the side sectional view of the same refrigerator of FIG. 15, it is the foam insulation material [ Urethane material] (5) is filled with a heat insulating box (6) formed on the upper surface of the refrigeration unit, that is, the compressor (96), the blower (97), the condenser (98) and the evaporator (99), and the cold air circulation fan (100). ) Is provided with a top cover 101 mounted thereon to cool the air by circulating and supplying cold air to each storage chamber R. The multi-stage insulating door 18 is opened to take out the article from the shelf 102 where the height can be freely adjusted.

By the way, in a large one like this business refrigerator, the height of the inner box exceeds 1400 m / m. On the other hand, the metal member which forms this is a material width dimension of 4 feeds (1219 m / m) as much as possible, and the inner box which becomes a side plate on the right and left of a back board must be comprised from a plurality of metal members like FIG. 20 mentioned above. do.

Therefore, the present invention is made simple by the manufacturing method as shown in Figs.

That is, two long horizontal metal flat plates 105 and 106 are prepared, and the two sheets are bent in a U-shape, and joined to the longitudinal direction to form an inner box having a maximum height of 8 feet.

로 서로 내부방향으로 구부려서 제17도에 나타내는 바와같은 ㄷ자형상의 금속평판(105)(106)을 만든다. 또한, 각 금속평판(105)(106)에 있어서 각 플랜지(109a)(109b)(110)(111)의 높이 칫수는 절개부(107)(108)의 깊이 이상으로 하여, 뒤에서 양 금속평판(105)(106)의 단면으 맞댈 때에 면 접합하는 것과 같은 플랜지면(112)(113)을 형성하고 있다. 이 후에서 금속평판(105)(106)의 맞대는 측의 대략 V자형상 플랜지(109)와 직각 플랜지(11)과를 끼워 맞춘후 코오킹한다. 이와같이 하여 등판과 좌우측판이 일체로 된 내부상자 주체(2A)가 완성된다. 코오킹후 코오너부(121)(122)를 R형상으로 U자형으로 구부린다. 양 금속평판(105)(106)의 접합면은 플랜지(112)(113)끼리 행하여져 있으므로 밀봉 효과는 양호한 것이다. 최후에 제17도와 같이 천정판(114), 바닥판(115)를 그 둘레가장자리에 형성된 대략 V자형상의 플래지(109a)(110)에 끼워 넣어서 코오킹 한다. 이와같이 하여 제18도에 나타내는 바와같이 내부상자(2)가 완성된다. 또한, (116)은 배수공이다. 이와같이 하여여 만든 내부상자(2)와 별도로 형성한 외부상자(3)과 조합하고, 그 사이에 발포단열재[우레탄재](5)를 발포 충전하는 것이지만, 제19도에 나타내는 바와같이 화살표 A위치에서 우레탄을 주입하면, 발포단열재(5)가 등부분 공간영역으로부터 측부 공간역에로 흘러 들어가는 것으로 각 코오너부에서는 종래와 같이 플랜지가 가로로 튀어 나와 있지 않으므로, 발포단열재(5)는 원활하게 흘러들어서 단열재의 발포 충전이 효율적으로 이루워진다.Next, a concrete manufacturing method of the inner box main body 2A will be described. First, the cutouts 107 and 108 are provided at the lengthwise edges of the two metal flat plates 105 and 106 at positions of fixed dimensions from both ends thereof. Next, one side of the metal flat plate 105 includes flanges 109a and 109b which are bent in a substantially V-shape, including the cutout 107 at both edges in the longitudinal direction thereof. On the other hand, the other metal plate 106 is formed by the flange 110 of the substantially V-shape including the incision 108 and the opposite end to the opposite side in the same way, the side edge of the other side, that is, the butting side Is formed by a flange 111 bent at a right angle. And, bend lines connecting the metal plates 105 and 106 at the cutouts 107 and 108.

By bending each other inwardly to form a U-shaped metal flat plates 105 and 106 as shown in FIG. In addition, in each metal plate 105 and 106, the height dimension of each flange 109a, 109b, 110, 111 should be more than the depth of the cutouts 107, 108, and both metal plate (after) The flange faces 112 and 113 which are surface-joined when the cross section of 105 and 106 are matched are formed. Thereafter, the metal flat plates 105 and 106 are fitted with the substantially V-shaped flange 109 and the right angle flange 11 on the butt side, and then caulked. In this way, the inner box main body 2A in which the back plate and the left and right plates are integrated is completed. After caulking, the nose holders 121 and 122 are bent into a U shape in an R shape. Since the joining surfaces of both metal flat plates 105 and 106 are formed between the flanges 112 and 113, the sealing effect is good. Finally, as shown in FIG. 17, the ceiling plate 114 and the bottom plate 115 are inserted into the substantially V-shaped flanges 109a and 110 formed at the periphery thereof and caulked. In this way, the inner box 2 is completed as shown in FIG. Also, 116 is a drain hole. The inner box 2 thus formed and the outer box 3 formed separately are foamed and filled with the foam insulation [urethane material] 5 therebetween, but as shown in FIG. 19, the arrow A position When urethane is injected into the foam insulation 5, the foam insulation 5 flows from the dorsal space area into the side space area, so that the flange insulation does not protrude horizontally in each coowner portion, so the foam insulation 5 flows smoothly. Foaming of the insulation is achieved efficiently.

Claims (2)

Insulating partition body partitioning the opening 7 in the opening 7 of the insulating box 6 which foam-fills the insulating material 5 in the space 4 between the inner box 2 and the outer box 3 ( 8), the heat insulating partition (8) is the outer material (13) so that the end portion 11 communicates with the space (4) in the opening (7) so that the whole becomes a hollow (12). And heat insulating material (5) in the space (4) part and the heat insulating material (15) in the hollow (12) part to be constituted by a series of foam insulation materials. In the heat insulation box 1 which foam-filled the heat insulating material 5 in the space 4 between the inner box 2 and the outer box 3, a pair of incisions 107 are respectively provided in the both sides of the longitudinal direction. A metal flat plate 105 having both sides 108 of which the flanges 109 of both edges bent to include the cutout 107 are both V-shaped, and one side edge is a V-shaped flange ( 110, the other side edge is provided with a metal plate 106 made of a right angle flange 111, a line connecting each metal plate 105, 106 to the incision 107, 108

To bend inward to each other to form a c-shape, butt the ends of the transition metal flat plates 105 and 106, fit the V-shaped flanges 109 and 110 and the right angle flange 111, and then caulk them. Thereby forming an inner box main body 2A in which the back plate and the left and right side plates are integrated, and the ceiling plate and the bottom plate of each of the V-shaped flanges 109 and 110 located above and below the inner box main body 2A. An insulating box body formed by inserting a circumferential edge and coking.

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