JP5465160B2 - Insulated hot water storage system - Google Patents

Description

  The present invention relates to an adiabatic hot water storage device.

  There is known a hot water supply technology in which hot water heated by a heat pump or a gas water heater is stored in a hot water storage tank, and the stored hot water is supplied to a necessary place when necessary. A technique for preventing the temperature of hot water stored in a hot water storage tank from being lowered by covering the hot water storage tank with a heat insulating member is known. Moreover, existence of the vacuum heat insulating member whose heat insulating performance is higher than a foaming heat insulating member is known.

  As disclosed in Patent Document 1, the vacuum heat insulating member sandwiches a porous core material between two films, and welds the two films in a range around the periphery of the sandwiched core material. Then, the existence range of the core material is sealed in a vacuum state. As illustrated in FIG. 2, the heat insulation performance is high in the core material existence range 6 e where the core material is present. On the other hand, in the welding ranges 6a, 6b, 6c, and 6d that make a round around the core material, there is no heat insulation performance because there is no core material. The film constituting the vacuum heat insulating member is a metal vapor deposition film obtained by vapor-depositing a metal film on a metal foil or a resin film, and two metal foils or two metal vapor deposition films are welded in the welding range. A welding range constituted by two metal foils or two metal vapor-deposited films becomes a good heat transfer member and does not become a heat insulating member.

  When the hot water storage tank is covered with the vacuum heat insulating member, it is necessary to prevent the welding range from touching the hot water storage tank in order to prevent the welding range from becoming a heat transfer member and increasing the heat radiation amount.

  In the technique of Patent Document 1, the welding range is folded back outside the core material existence range. The hot water storage tank is covered with a vacuum heat insulating member with the welding range folded outward. According to this technique, the hot water storage tank can be covered with a core material existence range having high heat insulation performance. Further, the welding range that becomes a heat transfer member is prevented from coming into contact with the hot water storage tank.

JP 2007-198717 A

  In the case of a vacuum heat insulating member, the welding range exists outside the four sides surrounding the core material existing range. In the case of the vacuum heat insulating member 6 illustrated in FIG. 2, welding ranges 6 a, 6 b, 6 c, and 6 d exist in four directions outside the core material existence range 6 e. FIG. 3A shows a shape in which the left side welding range 6b is folded outside the core material presence range 6e. In the shape of (a), the lower welding range 6c is not yet folded. When the hot water storage tank is covered with the vacuum heat insulating member having the shape (a), the lower welding range 6c comes into contact with the hot water storage tank. In order to prevent this, it is necessary to return to the outside of the core material presence range 6e up to the lower welding range 6c. (B) has shown the shape which turned down the lower side welding range 6c also to the outer side of the core material presence range 6e. If the hot water storage tank is covered with the vacuum heat insulating member 6 having the shape (b), the left welding range 6b does not contact the hot water storage tank, and the lower welding range 6c does not contact the hot water storage tank.

However, according to the technique of FIG. 3, at the position shown in A of FIG. 3B, the crease in the welding range is further folded, and the film is greatly stretched. At the position A shown in the figure, the film is easily stressed due to a large stress, and the vacuum sealing state is easily broken at the position A. When the vacuum sealing state is broken, the heat insulating performance in the core material existing range is significantly lowered. In the technique for preventing the welding range that becomes the heat transfer member by folding back all the welding ranges existing in the four directions outside the core material existence range 6e, the vacuum sealing of the vacuum heat insulating member at the time of manufacture is performed. The stop state is easily broken, and the vacuum sealing state of the vacuum heat insulating member is easily broken due to aging. In the conventional technology, it is difficult to manufacture a product, and the durability of the manufactured product is low.
The present invention provides a heat insulating hot water storage device that has high heat insulating performance, is easy to manufacture, and has excellent durability.

The heat insulation type hot water storage apparatus of the present invention includes a hot water storage tank, a vacuum heat insulating member that covers the hot water storage tank, and a foamable outer heat insulating member that covers the vacuum heat insulating member.
The left-side welding range and the right-side welding range of the vacuum heat insulating member are positioned between the core material presence range of the vacuum heat insulating member and the foamable outer heat insulating member in a folded posture. On the other hand, the lower welding range of the vacuum heat insulating member is positioned between the hot water storage tank and the foamable outer heat insulating member so as not to be folded.
According to the above configuration, both the left side welding range and the lower side welding range are not folded back. Further, both the right side welding range and the lower side welding range are not folded back. At least on the lower side of the core material existence range, the welding range is not folded back twice, and the crease is not folded back further. At least on the lower side of the core material presence range, the film constituting the vacuum heat insulating member is not excessively forced, and the vacuum heat insulating member can be prevented from being damaged or the durability being lowered.

  According to the said structure, the lower side welding range used as a heat-transfer member will contact | connect a hot water storage tank, and we are anxious about the heat insulation performance fall or the increase in heat dissipation. However, in the case of a hot water storage tank, hot hot water is stored in the upper part, and lower temperature is stored in the lower part than hot hot water stored in the upper part. If hot water is discharged from the hot water storage tank, low temperature water is introduced into the lower part of the hot water storage tank. Looking through the entire period of storing hot water and supplying hot water, and heating and storing the hot water, low temperature water is stored in the lower part of the hot water tank for a long time. The effect of increasing the amount of heat release due to the contact of the lower welding range as the heat member can be substantially ignored. In the case of the heat insulation type hot water storage apparatus of the present invention, the welding range as a heat transfer member is in contact with the hot water storage tank, but since the contact area is the lower part of the hot water storage tank, the substantial heat insulation performance of the hot water storage tank is hardly deteriorated.

The vacuum heat insulating member is preliminarily welded to form a bag shape along three sides, and a core material is inserted using the remaining portion along one side that has not yet been welded, and is evacuated. It is manufactured by welding while maintaining the state. The width of the welding range to be finally welded is wider than the width of the welding range extending along the other three sides that have been welded first.
In this case, it is preferable that one wide side be the left welding range or the right welding range. That is, it is preferable that one of the left side welding range and the right side welding range has a longer relationship than both the upper side welding range and the lower side welding range.
According to this configuration, the widest welding range in which the heat insulating performance is lowered can be folded back outside the core material existence range. The phenomenon in which the welding range reduces the heat insulation performance can be minimized.

Even if the positioning shape is formed on the foamable outer heat insulating member and the vacuum heat insulating member is brought into contact with the positioning shape, the welding range is easily deformed. The position is not determined. However, since the core material existing range is difficult to deform, if the core material existing range is brought into contact with the positioning shape formed on the foamable outer heat insulating member, the relative relationship between the foam outer heat insulating member and the core material existing range is determined. The positional relationship is positioned. If the left side welding range and the right side welding range are folded back outside the core material presence range, the left end and right end of the core material presence range can be positioned with respect to the foamable outer heat insulating member.
Therefore, a left-side positioning shape that projects in contact with the left end of the vacuum heat-insulating member with the left-side welding range folded in the circumferential direction on the foamable outer heat-insulating member, and the right-end and circumference of the vacuum heat-insulating member with the right-side welding range folded back It is preferable that a right side positioning shape projecting in the direction is formed.
In this case, due to the elastic force of the vacuum heat insulating member, the left end of the vacuum heat insulating member having a shape in which the left welding range is folded is brought into contact with the left positioning shape of the foamable outer heat insulating member so that the relative positional relationship is fixed, and the right welding range is The right end of the vacuum heat-insulating member having a shape folded is brought into contact with the right-side positioning shape of the foamable outer heat-insulating member, and the relative positional relationship is fixed. The vacuum heat insulating member is pressed against the inner surface of the foamable outer heat insulating member by the elastic force of the vacuum heat insulating member, and both are fixed. Both can be fixed without using double-sided tape or the like. When both are fixed, the vacuum heat insulating member is fixed to the foamable outer heat insulating member in a posture in which the left welding range and the right welding range are folded outward. The left side welding range and the right side welding range are positioned and fixed between the core material presence range of the vacuum heat insulating member and the foamable outer heat insulating portion in a posture folded outward.

Formed on the foamable outer heat insulating member is a lower positioning shape that projects in the axial direction with the lower end of the core material presence range of the vacuum heat insulating member, and an upper positioning shape that projects in the axial direction with the upper end of the core material existing range of the vacuum heat insulating member It is preferable that
In this case, the relative positional relationship in the axial direction between the foamable outer heat insulating member and the vacuum heat insulating member is adjusted to be constant.

  According to the present invention, the lower welding range that becomes the heat transfer member will be in contact with the hot water storage tank, but when hot water is stored and hot water is added, the amount of hot water is heated and stored throughout the period, Since the low-temperature cold water is stored for a long time in the lower part of the hot water storage tank that is in contact with the lower welding range, even if the lower welding range is in contact with the hot water storage tank, the amount of heat release does not increase substantially and the heat insulation performance Does not substantially decrease. In addition, since the lower welding range is not folded back, the lower welding range is not folded back twice, and the lower welding range is not excessively forced. Product assembly work is simplified and the manufacturing yield is improved. Moreover, the durability of the heat insulating hot water storage device is improved.

The disassembled perspective view of the heat insulation type hot water storage apparatus of Example 1 is shown typically. The plane and side of a vacuum heat insulation member are shown. A mode that the left side welding range and lower side welding range of a vacuum heat insulation member are turned up is shown. The state which arranged two sheets of the vacuum heat insulation member which turned up the left side welding range and the right side welding range is shown. The boundary part of the vacuum heat insulation member which turned up the left side welding range, and the vacuum heat insulation member which turned up the right side welding range is shown. The longitudinal cross-sectional view at the time of covering the hot water storage tank without folding up the upper side welding range and the lower side welding range is shown. The longitudinal cross-sectional view at the time of folding the upper side welding range and covering the hot water storage tank without folding the lower side welding range is shown. Sectional drawing which shows the relationship between the vacuum heat insulation member and the foamable outer heat insulation member which turned up the left side welding range and the right side welding range. Sectional drawing which shows the relationship between the vacuum heat insulation member and foamable outer heat insulation member before attaching to a hot water storage tank. FIG. 10 is an enlarged view of a part of FIG. 9.

The main features of the embodiments described below are listed below.
(Feature 1) The vacuum heat insulating member is divided into left and right parts. The foamable outer heat insulating member is also divided into left and right parts. Prior to attaching the heat insulating member to the hot water storage tank, the left vacuum heat insulating member is fixed to the inner surface of the left foamable outer heat insulating member, and the right vacuum heat insulating member is fixed to the inner surface of the right foamable outer heat insulating member. Thereafter, the hot water storage tank is covered with the left foamable outer heat insulating member and the right foamable outer heat insulating member.
(Feature 2) In order to fix the vacuum heat insulating member to the foamable outer heat insulating member, a contact portion for positioning is provided on the foamable outer heat insulating member. The curved vacuum heat insulating member is placed along the inner surface of the foamable outer heat insulating member, and the end of the curved vacuum heat insulating member is brought into contact with the contact portion. Then, the end of the vacuum heat insulating member is strongly pressed against the contact portion by the elastic force of the curved vacuum heat insulating member to return to the natural shape, and the vacuum heat insulating member is positioned and fixed with respect to the foamable outer heat insulating member. Is done. Moreover, the elastic force which acts on the vacuum heat insulating member in a state where both ends in the circumferential direction are constrained presses the vacuum heat insulating member against the inner surface of the foamable heat insulating member.
(Feature 3) An engaging structure is formed between the foamable outer heat insulating member and the adjacent foamable outer heat insulating member.

FIG. 1 schematically shows an exploded perspective view of the heat insulation type hot water storage apparatus of the first embodiment. A stainless steel hot water storage tank 8 stores hot water heated by a heat pump (not shown). The hot water storage tank 8 has a substantially cylindrical shape and is installed in such a posture that its axis is in the vertical direction.
4 is a left foamable heat insulation member, 6 is a left vacuum heat insulation member, 10 is a right vacuum heat insulation member, 12 is a right foamable heat insulation member, and 2 is a top foamability. Reference numeral 14 denotes an outer heat insulating member, and reference numeral 14 denotes a lower foamable outer heat insulating member. The stainless steel hot water storage tank 8 is covered with the heat insulating members 2, 4, 6, 10, 12, and 14 and is insulated from the surroundings.
FIG. 1 is a schematic diagram for showing an internal structure, and does not show an actual appearance or the like.

  As shown in FIG. 1, a part of the front side edge 4b of the left foamable outer heat insulating member 4 in the axial direction is notched (see 4a). Similarly, a part in the axial direction of the front side edge 12b of the right foamable outer heat insulating member 12 is also cut away (see 12a). When the front side edge 4b of the left foamable outer heat insulating member 4 is combined with the front side edge 12b of the right foamable outer heat insulating member 12, a through hole is formed by the notch 4a and the notch 12a. The A lid member 16 for opening and closing the through hole is prepared. A pair of thermistors 18 a and 18 b are attached to the outer wall of the hot water storage tank 8. In the state where the hot water storage tank 8 is covered with the heat insulating members 2, 4, 6, 10, 12, 14, the pair of thermistors 18 a, 18 b are connected to the front edge of the left vacuum heat insulating member 6 and the front side of the right vacuum heat insulating member 10. Located between the edges. The pair of thermistors 18a and 18b are located in the through hole, and are exposed to the inside of the through hole when the lid member 16 is removed. A part of the left vacuum heat insulating member 6 and a part of the right vacuum heat insulating member 10 are also exposed in the through hole. The operator can palpate the left vacuum heat insulating member 6 and the right vacuum heat insulating member 10 from the through hole, and can diagnose the normality of the left vacuum heat insulating member 6 and the right vacuum heat insulating member 10.

FIG. 2 shows the plane and side surfaces of the vacuum heat insulating member 6. As shown on the side surface, the center of the vacuum heat insulating member 6 is a thick core material existence range 6e. There are welding ranges 6a, 6b, 6c, and 6d in the four directions outside the core material existence range 6e.
FIG. 3A shows a shape in which the left side welding range 6b is folded outside the core material presence range 6e. In the shape of (a), the lower welding range 6c is not yet folded.
In the present embodiment, the left side welding range 6b and the right side welding range 6d are folded outward while the upper side welding range 6a and the lower side welding range 6c are used so as not to be folded back. FIG. 4 shows the left vacuum heat insulating member 6 having a shape in which the upper welding range 6a and the lower welding range 6c are not folded while the left welding range 6b and the right welding range 6d are folded outward, and the right thermal insulation folded in the same shape. The state which juxtaposed the member 10 is shown. Typically, the side surface of the hot water storage tank 8 is covered with the juxtaposed left vacuum heat insulating member 6 and the right heat insulating member 10.
In this embodiment, the welding ranges 6a, 6b, 6c, 6d, 10a, 10b, 10c, and 10d are used in a shape that is not double-folded.

FIG. 5 shows a cross section of a boundary portion between the vacuum heat insulating member 6 in which the right welding range 6d is folded and the vacuum heat insulating member 10 in which the left welding range 10b is folded. As shown in FIG. 1, since the thermistors 18a, 18b and the like are not arranged on the back side of the hot water storage tank, the left vacuum insulation member 6 and the right vacuum insulation member 10 are arranged so as to contact each other.
The right welding range 6 d of the vacuum heat insulating member 6 is folded outward and accommodated between the core material presence range 6 e and the outer heat insulating member 4. The left welding range 10 b of the vacuum heat insulating member 10 is folded outward and is accommodated between the core material presence range 10 e and the outer heat insulating member 12. The right welding range 6 d and the left welding range 10 b do not contact the hot water storage tank 8. The core material existence range 6e of the vacuum heat insulating member 6 and the core material existence range 10e of the vacuum heat insulating member 10 are close enough to say that they are substantially in contact with each other, and the core material existence range 6e, 10e covers the hot water storage tank 8 without any gaps.

FIG. 6 shows a longitudinal section at a position including the vacuum heat insulating member 10.
The upper welding range 10a extends along the outer surface of the hot water storage tank 8 without being bent outward. The upper welding range 10 a is accommodated between the hot water storage tank 8 and the outer heat insulating member 12. The lower welding range 10c also extends along the outer surface of the hot water storage tank 8 without being bent outward. The lower welding range 10 c is also accommodated between the hot water storage tank 8 and the outer heat insulating member 12. The same applies to the left vacuum heat insulating member 6.

  In the case of the present embodiment, the vacuum heat insulating members 6 and 10 do not have a portion that is folded back twice. If there is a place where the film is folded twice, it is necessary to carefully fold the film so that an excessive load is not applied to the film, resulting in a long manufacturing process. Alternatively, double folds may be damaged during the work of transporting and installing the product. Furthermore, there is a concern that deterioration is likely to proceed at double-folded points due to aging. In this embodiment, such anxiety material is wiped out.

As shown in FIG. 6, a recess 12 c that accommodates the vacuum heat insulating member 10 is formed on the inner surface of the outer heat insulating member 12. Steps 12d and 12e are formed at both ends in the axial direction of the recess 12c.
The distance L12 between the steps 12d and 12e is slightly longer than the distance L10 in the axial direction of the core material existence range 10e. The upper welding range 10a and the like of the vacuum heat insulating member 10 extend from the center of the thickness of the core material existence range 10e. In order to accommodate the vacuum heat insulating member 10 in the recess 12c, the upper welding range 10a extending from the center of the thickness must be shifted to a position along the inner surface of the core material existence range 10e. The same applies to the lower welding range 10c. The difference between the distance L12 and the distance L10 is insufficient to shift the upper welding range 10a from the center in the thickness direction to a position along the inner surface and shift the lower welding range 10c from the center in the thickness direction to a position along the inner surface. There is no distance set. When the vacuum heat insulating member 10 is accommodated in the recess 12c, the upper welding range 10a and the lower welding range 10c shift to positions along the inner surface, and at the same time, the axial position of the vacuum heat insulating member 10 with respect to the outer heat insulating member 12 is fixed. . A lower positioning shape 12e that projects in the axial direction with the lower end of the core material existence range 10e of the vacuum heat insulation member 10 and an upper side that projects in the axial direction with the upper end of the core material existence range 10e of the vacuum heat insulation member 10 A positioning shape 12d is formed. Similarly, the lower heat-insulating member 4 protrudes in the axial direction from the lower end of the core material existence range 6e of the vacuum heat insulating member 6 and the upper end of the core material existence range 6e of the vacuum heat insulating member 6 projects in the axial direction. An upper positioning shape that contacts is formed.
If the upper part of the hot water storage tank in which hot hot water is stored for a long time is covered with the upper welding ranges 6a and 10a, there is a concern that the heat insulation performance is deteriorated. In the present embodiment, the thickness of the outer heat insulating layers 4 and 12 is calculated by calculating the amount. Measures can be taken against problems arising from covering the hot water storage tank with the upper welding ranges 6a and 10a.

  As for the upper welding range 10a, as illustrated in FIG. When the upper welding range 10a is folded outward, it is folded twice at the boundary between the upper welding range 10a and the left welding range 10b and the boundary between the upper welding range 10a and the right welding range 10d, and the vacuum heat insulating member 10 is easily damaged. Become. Still, since it does not fold back in the lower welding range 10c, the number of places that fold back decreases. Since the number of places where careful work is required is reduced, the work process is simplified and the production yield is improved. In addition, since the number of places where deterioration with time progresses decreases, durability also increases. If it is not folded back twice in the lower welding range 10c, even if it is folded back on the upper side, the technical merit is still obtained. If the upper welding range 10a is folded back to the outside, the heat insulation performance does not deteriorate. Moreover, the high temperature of the hot water stored in the upper welding range 10a does not act to deteriorate the welding range 10a.

FIG. 9 shows an example in which a left side positioning shape 12 f for positioning the left end of the vacuum heat insulating member 10 and a right side positioning shape 12 g for positioning the right end are formed on the outer heat insulating member 12. The left positioning shape 12 f is located on the front side of the hot water storage tank 8, and the right positioning shape 12 g is located on the back side of the hot water storage tank 8. In this case, due to the elastic force of the vacuum heat insulating member 10, the left end of the vacuum heat insulating member 10 having a shape in which the left welding range 10b is folded back contacts the left positioning shape 12f of the foamable outer heat insulating member 12, and the relative positional relationship is fixed. (Refer to FIG. 10), the right end of the vacuum heat insulating member 10 having a shape in which the right welding range 10d is folded back comes into contact with the right positioning shape 12g of the foamable outer heat insulating member 12, and the relative positional relationship is fixed. The vacuum heat insulating member 10 is pressed against the inner surface of the foamable outer heat insulating member 12 by the elastic force of the vacuum heat insulating member 10, and both are fixed. Both can be fixed without using double-sided tape or the like. The same applies to the outer heat insulating member 4 and the vacuum heat insulating member 6.
As shown in FIG. 8, if the hot water storage tank 8 is sandwiched between the outer heat insulating member 4 to which the vacuum heat insulating member 6 is fixed and the outer heat insulating member 12 to which the vacuum heat insulating member 10 is fixed, the side surface of the hot water storage tank 8 is It is covered and insulated by the vacuum heat insulating member 6, the outer heat insulating member 4, the vacuum heat insulating member 10 and the outer heat insulating member 12.

  As shown in FIG. 5, the positioning shape 12 g of FIG. 9 cannot be formed on the back side of the hot water storage tank 8 when the vacuum heat insulating members 6 and 10 are disposed so as to contact each other. Even in this case, the positioning shape 12f is useful. If the vacuum heat insulating member 10 is positioned on the basis of the positioning shape 12f, the positional relationship between the vacuum heat insulating member 10 and the outer heat insulating member 12 is stabilized. In the operation of fixing the vacuum heat insulating member 10 to the outer heat insulating member 12 with an adhesive tape or the like, if the positioning shape 12f is used as a reference, the positional relationship of the vacuum heat insulating member 10 fixed to the outer heat insulating member 12 is stabilized.

  Adjacent outer heat insulating members are fixed using the engaging portion. For example, as illustrated in FIG. 5, the left outer heat insulating member 4 and the right outer heat insulating member 12 are fixed by engaging the hook 4m and the hook 12m. As illustrated in FIG. 6, the upper outer heat insulating member 2 is fixed to the left outer heat insulating member 4 or the right outer heat insulating member 12 using a hook 2m, and the lower outer heat insulating member 14 is hooked to the hook 14m. To the left outer heat insulating member 4 or the right outer heat insulating member 12. The operator can disengage the hooks 4m, 2m, 14m, etc. to remove the engagement relationship, and can divide the outer heat insulating members 2, 4, 12, and 14.

  As mentioned above, although the Example of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and achieving one of the objects itself has technical utility.

2: Upper foamable outer heat insulating member 4: Left foamable outer heat insulating member 6: Left vacuum heat insulating member 6a: Upper welding range, 6b: Left welding range, 6c: Lower welding range, 6d: Right welding range,
6e: Core material existence range 8: Hot water storage tank 10: Right side vacuum heat insulating member 10a: Upper welding range, 10b: Left side welding range, 10c: Lower side welding range, 10d: Right side welding range, 10e: Core material existence range 12: Right side Foamable outer heat insulating member 14: lower foamable outer heat insulating member 16: lid member

Claims (3)

A hot water storage tank,
A vacuum insulation member covering the hot water storage tank;
It has a foamable outer heat insulating member that covers the vacuum heat insulating member,
The left side welding range and the right side welding range of the vacuum heat insulating member are positioned between the core material existing range of the vacuum heat insulating member and the foamable outer heat insulating member in a folded posture,
The lower welding range of the vacuum heat insulating member is positioned between the hot water storage tank and the foamable outer heat insulating member in a posture that is not folded back .
One of the left welding range and the right welding range vacuum thermal insulation member, the cross-sectional thermal hot water storage device you wherein a longer than both the upper welding range and a lower welding range. A hot water storage tank,
A vacuum insulation member covering the hot water storage tank;
It has a foamable outer heat insulating member that covers the vacuum heat insulating member,
The left side welding range and the right side welding range of the vacuum heat insulating member are positioned between the core material existing range of the vacuum heat insulating member and the foamable outer heat insulating member in a folded posture,
The lower welding range of the vacuum heat insulating member is positioned between the hot water storage tank and the foamable outer heat insulating member in a posture that is not folded back.
On the foamable outer heat insulating member, the left side positioning shape that makes a circumferential contact with the left end of the vacuum heat insulating member in the shape where the left welding range is folded, and the right end and the circumferential direction of the vacuum heat insulating member in the shape where the right welding range is folded back sectional thermal hot water storage device you characterized in that the right positioning shape is formed to突接. A hot water storage tank,
A vacuum insulation member covering the hot water storage tank;
It has a foamable outer heat insulating member that covers the vacuum heat insulating member,
The left side welding range and the right side welding range of the vacuum heat insulating member are positioned between the core material existing range of the vacuum heat insulating member and the foamable outer heat insulating member in a folded posture,
The lower welding range of the vacuum heat insulating member is positioned between the hot water storage tank and the foamable outer heat insulating member in a posture that is not folded back.
Formed on the foamable outer heat insulating member is a lower positioning shape that projects in the axial direction with the lower end of the core material presence range of the vacuum heat insulating member, and an upper positioning shape that projects in the axial direction with the upper end of the core material existing range of the vacuum heat insulating member sectional thermal hot water storage device you characterized in that it is.

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