JP2008107015A - Hot water storage tank heat insulating structure and method of manufacturing split heat insulating member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide hot water storage tank heat insulating structure having the compact shape and being easily assembled, and to provide a manufacturing method of a split heat insulating member capable of tightly filling an internal space of the split heat insulating members with foam insulation and exercising high heat insulating effect to form a heat insulating surrounding member disposed in a space between a tank and a square cylindrical exterior case. <P>SOLUTION: This hot water storage tank heat insulating structure comprises the cylindrical hot water storage tank 9, the square cylindrical exterior case 27, and the heat insulating surrounding member 3 disposed in a space 28 formed by the tank 9 and the exterior case 27. The heat insulating surrounding body 3 is composed of four split heat insulating members 4, 4, ... divided at parts corresponding to corner portions 26 of the exterior case 27 on its cross-section. Each split heat insulating member 4 is integrally formed by a circular arc-shaped inner surface member 2, a flat face-shaped outer surface member 1 having a linear intermediate part, a vacuum heat insulating member 7 disposed in an internal space 6 therebetween, and a hard urethan foam member 8 filled in the internal space 6 on its cross-section. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot water storage tank heat insulating structure and a method for manufacturing a divided heat insulating member.

In the conventional hot water storage tank heat insulating structure, a sheet-like heat insulating material is interposed in the space between the cylindrical hot water storage tank and the rectangular tubular outer case, and further, a vacuum heat insulating material is provided along the tank, and the above-mentioned A space is known that passes through at least a portion where the tank and the outer case are closest to each other (a central portion of each side of the cross section) (see, for example, Patent Document 1).
JP 2005-226965 A

In the conventional hot water storage tank insulation structure, the space between each vacuum insulation material and the outer case is very narrow, centering on the closest part, so that the sheet-like insulation material cannot be charged tightly and a gap is created. As a result, the heat insulation effect declines. Moreover, the operation | work which inserts a sheet-like heat insulating material and a vacuum heat insulating material in the space between a cylindrical hot water storage tank and an exterior case will become very difficult.
Moreover, since the sheet-like heat insulating material is formed of a flexible foam, the heat insulating efficiency is poor.

Then, an object of this invention is to provide the hot water storage tank heat insulation structure which has a compact external shape and is easy to assemble.
Further, it is a manufacturing method of a divided heat insulating member for forming a heat insulating enclosure interposed in a space between a tank and a rectangular tube-shaped outer case, and a foamed heat insulating material is formed in the inner space of the divided heat insulating member without a gap. It aims at providing the manufacturing method of the division | segmentation heat insulation member which can be filled and exhibits a big heat insulation effect.

  In order to achieve the above object, a hot water storage tank heat insulation structure according to the present invention is formed by a cylindrical hot water storage tank, a rectangular tubular outer case surrounding the hot water storage tank, the hot water storage tank and the outer case. Comprising a heat insulating enclosure interposed in the space, and the heat insulating enclosure is composed of four divided heat insulating members divided in a cross section at portions corresponding to the corners of the quadrangular exterior case, Further, each divided heat insulating member has an arcuate inner surface member, a flat surface outer surface member having a linear intermediate portion, and a vacuum disposed between the inner surface member and the outer surface member in the cross section thereof. A cross-sectional shape formed integrally from a heat insulating material and a rigid foamed urethane member filled in an internal space surrounded by the inner surface member and the outer surface member, and consisting of an intermediate thin portion and thick portions near both ends It is.

The vacuum heat insulating material has a flat plate shape, is provided along the inner surface of the outer surface member, and is disposed at least in the thin portion.
The outer surface member is formed of a metal plate, and the inner surface member is formed of laminated paper.
The outer surface member has a first bent side bent in the thickness direction inside each of both end edges, and the inner surface member has a thickness direction in each of both end edges. A second bent side that is bent outward, and in the mutual mating surfaces of the adjacent divided heat insulating members, the first bent side has a terminal edge that ends at an intermediate position in the thickness direction; Each of the second bent sides is overlaid on each of the terminal edges.

Further, the method of manufacturing the divided heat insulating member according to the present invention has a cross-sectional shape composed of an intermediate thin portion and a thick portion near both ends, and is in the space between the cylindrical hot water storage tank and the rectangular tubular outer case. In addition, in the method of manufacturing the divided heat insulating member that is internally divided into four parts, the outer surface member and the inner surface member are provided detachably on the lower mold and the upper mold of the foaming jig, respectively. The resin liquid for urethane foam is poured along the central portion corresponding to the thin portion, and then the upper mold is closed to the lower mold, and the resin is placed in the inner space surrounded by the outer surface member and the inner surface member. The liquid is foamed and filled.
In addition, the outer surface member and the flat vacuum heat insulating material are sequentially laminated on the lower mold, and the foamed urethane resin solution is poured into the vacuum heat insulating material along the central portion corresponding to the thin portion.

The present invention has the following remarkable effects.
Since the heat insulation tank heat insulation structure which concerns on this invention can divide | segment a heat insulation enclosure into four division | segmentation heat insulation members, a heat insulation enclosure can be assembled quickly and easily. And since each division | segmentation heat insulation member is divided into 4 parts, it can manufacture easily compared with the case where a cylindrical integral heat insulation enclosure is manufactured.
In addition, since the outer shape of the outer case surrounding the cylindrical hot water storage tank is a quadrangular shape, the outer shape becomes a compact outer shape, which does not require a lot of space for installation and is convenient.
Moreover, even if it is a part with few hard foaming urethane members, a heat insulation can be reliably performed by providing a vacuum heat insulating material in the thin part of each division | segmentation heat insulation member. Therefore, it is possible to prevent the heat of the tank from escaping to the outside by preventing the heat insulation power of the whole heat insulation enclosure from being lowered.

  Also, on the outer surface member set in the lower mold of the foaming jig, the resin liquid for urethane foam is poured along the central part corresponding to the thin part, and then the upper mold is closed to the lower mold, so that the resin liquid By pushing away from the central part to both sides, the thin foamed urethane member can be filled in the thin part without any gaps. Therefore, there is no gap, and it is possible to reliably prevent the heat insulating power from being lowered.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
1 to 3 show a first embodiment of a hot water storage tank heat insulation structure according to the present invention. A cylindrical hot water storage tank 9, a rectangular tubular outer case 27 surrounding the hot water storage tank 9, and the hot water storage tank 9. And a heat insulating enclosure 3 interposed in a space 28 formed by the outer case 27.
The cylindrical hot water storage tank 9 is provided for an electric water heater or various water heaters. Further, the outer case 27 (omitted in FIG. 1) has a quadrangular cylindrical shape in the cross section.
The heat insulating enclosure 3 is composed of four divided heat insulating members 4, 4, 4 and 4 which are divided at portions corresponding to the four corner portions 26 of the quadrangular outer case 27 in the cross section. . In other words, each divided heat insulating member 4 is continuously aligned with the adjacent divided heat insulating members 4 and 4 at the mating surfaces 5 and 5 at both ends thereof to form an annular heat insulating enclosure 3 in the space 28. Intervened. Further, a vertical chamfer 18 is formed so that adjacent divided heat insulating members 4 and 4 are continuous. Further, the inner corner portion of the outer case 27 may be formed in an inclined shape corresponding to the chamfered portions 18 at the four corners of the heat insulating enclosure 3 to be described later.

  Each divided heat insulating member 4 has an arc-shaped inner surface member 2 and a flat surface-shaped outer surface member 1 whose intermediate portion is linear in the cross section thereof. The inner surface member 2 has a quarter arc-shaped arc surface portion 21 and a second bent side 23 in which both end edges 22 and 22 of the arc surface portion 21 are bent outward in the thickness direction in the cross section. . Furthermore, the edge of both the 2nd bending sides 23 and 23 has the 2nd edge sides 24 and 24 formed in the mutually opposite direction by the vertical bending part. The inner surface member 2 is made of laminated paper (kraft paper laminated with polyethylene, polypropylene, or the like).

Next, in the cross section, the outer surface member 1 bends the straight flat portion 19 of the intermediate portion and both end edges 12 and 12 of the flat portion 19 in parallel with both sides of the arc surface portion 21 of the inner surface member 2. Each of the chamfered portion forming surfaces 16 and 16 has a first bent side 13 bent inward in the thickness direction. And in the mutual joining surfaces 5 and 5 of the adjacent division heat insulation members 4 and 4, the 1st bending sides 13 and 13 have the termination | terminus edge parts 13a and 13a which were complete | finished in the thickness direction intermediate position, Each second bent side 23 is superimposed on the edge 13a. Each first bent side 13 has a shorter length in the thickness direction than each second bent side 23, and each first bent side 13 has an inner side (internal space) of each second bent side 23. 6 side). The outer surface member 1 is formed from a metal plate 15 such as a steel plate having a thickness of 0.2 to 0.4 mm, and has strength to prevent damage to the vacuum heat insulating material 7 described later against external impacts and the like.
And when the division | segmentation heat insulation member 4 is enclosed by the tank 9, the termination | terminus edge part 13a of the outer surface member 1 does not reach the circular arc surface part 21 of the inner surface member 2, and does not contact the tank 9 Therefore, it can prevent that the heat of the tank 9 escapes outside via the outer surface member 1, and temperature falls.
Further, the chamfered portion forming surfaces 16 and 16 of the adjacent divided heat insulating members 4 and 4 are continuous to form the chamfered portion 18 of the heat insulating enclosure 3.
And each division | segmentation heat insulation member 4 has the thin part 10 of the middle in the cross section, and the thick parts 20 and 20 near both ends.
The thickness direction is the same direction as the radial direction of the cylindrical tank 9 in the cross section.

Moreover, each division | segmentation heat insulation member 4 has the vacuum heat insulating material 7 arrange | positioned between the inner surface member 2 and the outer surface member 1 in the cross section.
The vacuum heat insulating material 7 has a flat plate shape (vertically long rectangular shape), and is provided so as to be positioned at least in the thin portion 10 along the inner surface 11 of the flat portion 19 of the outer surface member 1. Specifically, the vacuum heat insulating material 7 is provided so that its intermediate portion passes through the closest space located in the thin portion 10 of the internal space 6. In addition, in the Example, although the vacuum heat insulating material 7 and the inner surface of the inner surface member 2 are contact | abutting, the hard foaming urethane member 8 may be interposed between them slightly spaced apart. The vacuum heat insulating material 7 is formed shorter than the flat portion 19 of the outer surface member 1 in the cross section.
The vacuum heat insulating material 7 is obtained, for example, by incorporating a flat heat insulating material such as glass wool or foamed polyurethane in an aluminum bag and bleeding the air in the aluminum bag.

  Each divided heat insulating member 4 includes a hard foamed urethane member 8 filled in an internal space 6 surrounded by the inner surface member 2 and the outer surface member 1. The hard foamed urethane member 8 has a large heat insulating power obtained by foaming and solidifying a two-component mixed resin liquid. In the internal space 6, the thick portions 20, 20 and the thin portions 10 (the vacuum heat insulating material 7 and the inner surface) The narrow space between the members 2 is also packed tightly.

Next, FIG. 4 shows a second embodiment of the hot water tank insulation structure according to the present invention. The divided heat insulating member 4 shown in FIG. 4 is different from the divided heat insulating member 4 in FIG. 3 in that the outer surface member 1 is formed from the same laminated paper 25. Specifically, the outer surface member 1 is parallel to the both sides of the arcuate surface portion 21 of the inner surface member 2 in the cross section of the straight plane portion 19 of the intermediate portion and both end edges 12 and 12 of the plane portion 19. And a chamfered portion forming surface 16 that is bent into a chamfer. Furthermore, the edge of the double-sided part forming surfaces 16, 16 has first end sides 29, 29 that are formed in opposite directions by the vertical bent portions. The first end sides 29 are overlapped and bonded to the second end sides 24 of the inner surface member 2.
Further, the chamfered portion forming surfaces 16 and 16 of the adjacent divided heat insulating members 4 and 4 are continuous to form a chamfered portion 18 of the heat insulating enclosure 3, and the vacuum heat insulating material 7 is an outer surface member. The point provided along the inner surface 11 of the flat portion 19 is the same as that of the divided heat insulating member 4 of FIG.

  Next, FIG. 5 shows a third embodiment of the hot water storage tank heat insulating structure according to the present invention, in which the vacuum heat insulating material 7 is not provided in the internal space 6 and is filled with the hard foamed urethane member 8. 4 is different from the divided heat insulating member 4 in FIG. That is, in the thin portion 10, the hard foamed urethane member 8 is filled between the outer surface member 1 and the inner surface member 2.

Next, as a method for manufacturing each divided heat insulating member 4, the divided heat insulating member 4 in FIG. 4 will be described as an example.
In FIG. 6, reference numeral 30 denotes a foaming jig for manufacturing the divided heat insulating member 4, and the foaming jig 30 is attached to a lower mold 31 having a planar first set surface 31a. An upper mold 32 having two set surfaces 32a is attached with a hinge portion so as to be openable and closable (so-called open foaming). Then, the flat vacuum heat insulating material 7 is placed on the flat surface portion 19 of the outer surface member 1 made of the laminate paper 25, and is set on the first set surface 31a. At both ends of the inner surface 11 of the outer surface member 1, leakage preventing members 34 and 34 having curved portions corresponding to the arcuate surface portion 21 of the inner surface member 2 are provided. In addition, the inner surface member 2 made of laminated paper is set on the upper mold 32 so that the circular arc surface portion 21 fits into the second set surface 32a. Before setting the holding jig 30, the outer surface member 1 is formed with a chamfered portion forming surface 16 and a first end side portion 29, and the inner surface member 2 has a second bent side. 23, a second end 24 is formed.

Next, as shown in FIGS. 7 and 8, with the upper die 32 open, while moving the nozzle 35 along the central portion 14 corresponding to the thin portion 10 on the vacuum heat insulating material 7, Pour resin liquid 36. As the resin liquid 36, a two-liquid mixture of polyol and isocyanate is used. The nozzle 35 is moved from one side in the longitudinal direction of the vacuum heat insulating material 7 to the other side.
Then, as shown in FIG. 9, when the upper mold 32 is closed with respect to the lower mold 31, the resin liquid 36 is swept away by the inner surface central portion 33 of the inner surface member 2 to both sides in a cross sectional view while foaming. To go. Then, as shown in FIG. 10, the upper mold 32 is closed with respect to the lower mold 31, and the second end sides 24 and 24 of the inner surface member 2 are overlapped with the first end sides 29 and 29 of the outer surface member 1. Match. When the resin liquid 36 is filled to every corner of the internal space 6 and foamed and solidified to form the hard foamed urethane member 8, the upper mold 32 is opened and the completed divided heat insulating member 4 is taken out. As described above, since the resin liquid 36 is washed away from the central portion 14 to both sides, the thin foamed urethane member 8 can be filled in the thin portion 10 without any gap.

  FIG. 11 is an explanatory view of a manufacturing method of the divided heat insulating member 4 shown in FIG. 3, and after setting the outer surface member 1 and the inner surface member 2 on the lower die 31 and the upper die 32, the resin liquid 36 is poured. Thus, the procedure until the split heat insulating member 4 is formed is the same as described with reference to FIGS.

Next, FIGS. 12A to 12C show various cross-sectional outer shape patterns of the outer case 27. FIG. The outer case 27 in FIG. 12 (a) has a square outer shape, FIG. 12 (b) has an outer shape in which chamfered portions 18 are formed in square corners, and FIG. Each of the four corners of the square shape has an outer shape in which rounded portions 38 are formed.
12A to 12C show various cross-sectional shape patterns of the respective divided heat insulating members 4. FIG. FIG. 12 (a) is the same as that described in FIGS. 3 to 5, and FIG. 12 (b) shows that both ends of each of the outer surface member 1 and the inner surface member 2 are continuous at the mating surfaces 5 and 5 in the thickness direction. A heat insulating enclosure having a square outer shape is formed from the four divided heat insulating members 4... FIG. 12 (c) shows a rounded shape of the chamfered portion forming surface 16 of the divided heat insulating member 4 in FIG. The shape of the heat insulation enclosure is formed from the four divided heat insulation members 4... And the square corners are rounded.
The heat insulating enclosure 3 formed from the divided heat insulating member 4 of FIG. 12 (a) is combined with, for example, the exterior case 27 of FIGS. 12 (a) to 12 (c). Further, the heat insulating enclosure 3 in FIG. 12 (b) is combined with the outer case 27 in FIG. 12 (a). Further, the heat insulating enclosure 3 in FIG. 12C is combined with the exterior case 27 in FIGS. 12A and 12C.

  In addition, about the case where the division | segmentation heat insulation member 4 of FIG. 5 is manufactured, in FIG. 6, only the outer surface member 1 is set to the lower mold | type 31 (without setting the vacuum heat insulating material 7), and FIG. The same operation as in FIG. 10 may be performed. In this case, the resin liquid 36 is poured while moving the nozzle 35 along the center of the flat surface portion 19 of the outer surface member 1.

  Then, as shown in FIG. 1, the four divided heat insulating members 4... Are combined with the respective mating surfaces 5 and 5 to surround the hot water storage tank 9 to form the heat insulating enclosure 3, and are surrounded by the outer case 27. The shape. Thus, the heat insulation enclosure 3 is interposed in the space 28 (see FIG. 2) formed by the tank 9 and the outer case 27 surrounding the tank 9.

FIG. 13 shows a conventional hot water storage tank heat insulation structure, in which a sheet-like heat insulating material 44 is interposed in a space 43 formed between the cylindrical hot water storage tank 9 and the outer case 40. In the vicinity of the closest portion 46 in the space between the tank 9 and the outer case 40, it becomes difficult to put the heat insulating material 44, and a gap 45 is formed, so that the heat of the tank 9 easily escapes from the gap 45.
On the other hand, in the present invention, since the hard foamed urethane member 8 is densely filled in the thin portion 10 of each divided heat insulating member 4, the heat insulating effect is greatly increased. And since there are few parts which the tank 9 contacts the vacuum heat insulating material 7, a thermal load can be reduced, the failure | damage in an assembly process can be prevented, and long-term performance maintenance of the vacuum heat insulating material 7 is attained. Further, according to the divided heat insulating member 4 of FIGS. 3 and 11, the vacuum heat insulating material 7 is protected from impact from the outside by the outer surface member 1 made of the metal plate 15, and the long-term performance can be maintained.

As described above, the hot water storage tank heat insulation structure according to the present invention is a space formed by the cylindrical hot water storage tank 9, the rectangular tubular outer case 27 surrounding the hot water storage tank 9, and the hot water storage tank 9 and the outer case 27. 28 includes a heat insulating enclosure 3 interposed between them, and the heat insulating enclosure 3 is divided into four divided heat insulating members 4 which are divided at portions corresponding to the corners 26 of the quadrangular outer case 27 in the cross section. 4, 4, 4, and 4, and each divided heat insulating member 4 has an arc-shaped inner surface member 2, a flat surface-shaped outer surface member 1 whose intermediate portion is linear, and an inner surface member 2 in the cross section. And a vacuum heat insulating material 7 disposed between the outer surface member 1 and a rigid foamed urethane member 8 filled in the inner space 6 surrounded by the inner surface member 2 and the outer surface member 1. Cross-sectional shape consisting of an intermediate thin part 10 and thick parts 20 and 20 near both ends Therefore, the heat insulating enclosure 3 can be assembled quickly and easily from the four divided heat insulating members 4. Moreover, since each of the divided heat insulating members 4 is obtained by dividing the surrounding heat insulating enclosure 3 into four parts, it is very easy to manufacture compared to the case of forming a cylindrical integral heat insulating enclosure.
Further, since the outer shape of the outer case 27 surrounding the cylindrical hot water storage tank 9 is a quadrangular shape, the outer shape of the outer case 27 is compact and is convenient because it does not require a large installation space.
Moreover, since each division | segmentation heat insulation member 4 is integrally formed, it is a very strong structure and durability is large. Moreover, since the vacuum heat insulating material is provided, even if it is a portion with a small number of hard foamed urethane members, heat insulation can be reliably performed, and the heat of the tank is reduced without reducing the heat insulation power of the whole heat insulation enclosure. Escape to the outside can be surely prevented.

  The vacuum heat insulating material 7 has a flat plate shape, is provided along the inner surface 11 of the outer surface member 1, and is disposed at least in the thin portion 10, so that it is hard foamed like the thin portion 10. Even in a portion where a small number of urethane members 8 are provided, heat insulation can be reliably performed by the vacuum heat insulating material 7. Therefore, it is possible to prevent the heat of the tank 9 from escaping to the outside by preventing the heat insulation power of the heat insulation enclosure 3 from decreasing.

  Moreover, since the outer surface member 1 is formed from the metal plate 15 and the inner surface member 2 is formed from the laminated paper, the outer surface member 1 formed from the metal plate 15 prevents external impacts and the like. The vacuum heat insulating material 7 is not damaged. Therefore, it is possible to reliably prevent a decrease in heat insulation power. Moreover, since the inner surface member 2 made of laminated paper is interposed between the tank 9 and the vacuum heat insulating material 7, the heat load received directly from the tank 9 is reduced, and the vacuum heat insulating material 7 can maintain the performance for a long time.

  Further, the outer surface member 1 has first bent sides 13 that are bent inward in the thickness direction at both end edges 12 and 12, and the inner surface member 2 has both end edges 22 and 22. Each of which has a second bent side 23 bent outward in the thickness direction, and the first bent sides 13 and 13 are formed on the mating surfaces 5 and 5 of the adjacent divided heat insulating members 4 and 4. Since the end edge portions 13a and 13a are finished at the middle position in the thickness direction, and each second bent side 23 is overlapped with each end edge portion 13a, the divided heat insulating member 4 is enclosed in the tank 9 In this case, the end edge portion 13a of the outer surface member 1 does not directly contact the tank 9, and the heat of the tank 9 is prevented from being transmitted to the outer surface member 1 and radiated to the outside. Therefore, heat insulation can be performed reliably.

  In addition, the method of manufacturing the divided heat insulating member according to the present invention has a cross-sectional shape including an intermediate thin portion 10 and thick portions 20 and 20 near both ends, and includes a cylindrical hot water storage tank 9 and a rectangular tubular outer case. In the method of manufacturing the divided heat insulating member 4 that is internally divided into four spaces 28 in the space 28, the outer surface member 1 and the inner surface member 2 are connected to the lower mold 31 and the upper mold of the foaming jig 30. 32 is provided in a detachable manner, and the urethane foam resin liquid 36 is poured onto the outer surface member 1 along the central portion 14 corresponding to the thin portion 10, and then the upper die 32 is closed to the lower die 31 and the outer surface. Since the resin liquid 36 is foamed and filled in the internal space 6 surrounded by the member 1 and the inner surface member 2, the resin liquid is moved from the central portion 14 to both sides by closing the upper mold 32 to the lower mold 31. By being washed away, the thin foamed portion 10 can be filled with the rigid foamed urethane member 8 without any gaps. Therefore, a gap is not formed, and it is possible to reliably prevent the heat insulating power from being lowered. In addition, in the manufacturing process, it is only necessary to pour the resin liquid 36 and close the upper mold 32 to the lower mold 31, so that the divided heat insulating member 4 can be formed very easily.

Further, the outer surface member 1 and the flat vacuum heat insulating material 7 are sequentially laminated on the lower mold 31, and the foamed urethane resin liquid 36 is applied to the vacuum heat insulating material 7 along the central portion 14 corresponding to the thin portion 10. Therefore, even if the hard foamed urethane member 8 is provided in a small amount like the thin portion 10, the vacuum heat insulating material 7 can surely insulate. Therefore, it is possible to prevent the heat of the tank 9 from escaping to the outside by preventing the heat insulation enclosure 3 from deteriorating the heat insulation power.
In the manufacturing process, it is only necessary to pour the resin liquid 36 and close the upper die 32 to the lower die 31. Therefore, the divided heat insulating member 4 can be formed very easily.

It is a perspective view which shows the hot water storage tank heat insulation structure which concerns on this invention. FIG. It is a plane sectional view showing a 1st embodiment of a division heat insulation member concerning the present invention. It is a plane sectional view showing a 2nd embodiment of a division heat insulation member concerning the present invention. It is a plane sectional view showing a 3rd embodiment of the division heat insulation member concerning the present invention. It is a perspective view explaining the manufacturing method of the division | segmentation heat insulation member of 2nd Embodiment. It is a perspective view. It is principal part sectional drawing. It is sectional drawing. It is sectional drawing. It is principal part sectional drawing explaining the manufacturing method of the division | segmentation heat insulation member of 1st Embodiment. It is simplified sectional drawing, (a) (b) (c) is a simplified sectional view of an exterior case, (a) (b) (c) is a simplified sectional view of a divided heat insulating member. It is sectional drawing which shows the conventional hot water storage tank heat insulation structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer surface member 2 Inner surface member 3 Heat insulation enclosure 4 Division heat insulation member 5 Matching surface 6 Internal space 7 Vacuum heat insulating material 8 Hard foaming urethane member 9 Hot water storage tank
10 Thin section
11 Inside
12 Edge
13 1st bent side
13a End edge
14 Center
15 Metal plate
20 Thick part
22 Edge
23 2nd bent side
26 Corner
27 Exterior case
28 space
30 Jig
31 Lower mold
32 Upper mold
36 Resin liquid

Claims (6)

A cylindrical hot water storage tank (9), a rectangular tubular outer case (27) surrounding the hot water storage tank (9), and a space (28 formed by the hot water storage tank (9) and the outer case (27) A heat-insulating enclosure (3) interposed between
The heat insulating enclosure (3) has four divided heat insulating members (4), (4) divided at a portion corresponding to the corner (26) of the quadrangular outer case (27) in the cross section. (4) In addition, each divided heat insulating member (4) consists of an arc-shaped inner surface member (2) and a flat planar outer surface member (1) whose intermediate portion is linear in the cross section. And a vacuum heat insulating material (7) disposed between the inner surface member (2) and the outer surface member (1), and the inner surface member (2) and the outer surface member (1). A rigid foamed urethane member (8) filled in the internal space (6) is integrally formed, and has a cross-sectional shape comprising an intermediate thin part (10) and thick parts (20) and (20) near both ends. A hot water tank insulation structure characterized by that.   The vacuum heat insulating material (7) has a flat plate shape, is provided along the inner surface (11) of the outer surface member (1), and is disposed at least in the thin portion (10). Item 2. A hot water tank insulation structure according to Item 1.   The hot water storage tank heat insulating structure according to claim 1 or 2, wherein the outer surface member (1) is formed of a metal plate (15), and the inner surface member (2) is formed of laminated paper.   The outer surface member (1) has first bent sides (13) which are bent inward in the thickness direction at both end edges (12) and (12), and the inner surface member (2). ) Has a second bent side (23) bent outward in the thickness direction at each of both end edges (22) and (22), and the adjacent divided heat insulating members (4) and (4) are adjacent to each other. In the mating surfaces (5) and (5), the first bent sides (13) and (13) have end edges (13a) and (13a) that end at intermediate positions in the thickness direction. The hot water storage tank heat insulating structure according to claim 3, wherein each of the second bent sides (23) is overlapped with the portion (13a). It has a cross-sectional shape consisting of an intermediate thin part (10) and thick parts (20), (20) near both ends, between the cylindrical hot water storage tank (9) and the rectangular tubular outer case (27). In the method of manufacturing the divided heat insulating member (4) that is internally divided into four in the space (28),
The outer surface member (1) and the inner surface member (2) are detachably provided on the lower mold (31) and the upper mold (32) of the foaming jig (30), respectively.
A resin liquid (36) for urethane foam is poured onto the outer surface member (1) along the central part (14) corresponding to the thin part (10), and then the upper mold (32) is moved to the lower mold (31 And the resin liquid (36) is foamed and filled in the internal space (6) enclosed by the outer surface member (1) and the inner surface member (2). The manufacturing method.   On the lower mold (31), the outer surface member (1) and a flat vacuum heat insulating material (7) are sequentially laminated, and the vacuum heat insulating material (7) has a central portion corresponding to the thin portion (10). The manufacturing method of the division | segmentation heat insulation member of Claim 5 which pours the resin liquid (36) for urethane foams along (14).

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