JP2013194979A - Heat insulating structure for storage water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leakage of heat of a hot water storage tank from a clearance of a heat insulating structure and improve strength by feeding foamed particles to every corner within a molding tool during molding of a heat insulating structure.SOLUTION: A heat insulating structure 100 of a hot water storage tank 21 includes divided heat insulating materials 100A-100E, and the divided heat insulating material 100C includes a foamed heat insulating material 101 and a vacuum heat insulating material 102. The vacuum heat insulating 102 is inclined to an inner face 101a and an outer face 101b of the foamed heat insulating material 101, and a distance between the surface of the vacuum heat insulating material 102 and the inner face 101a and the outer face 101b varies depending on portions. Thus during molding of the foamed heat insulating material 101, pre-expanded particles 111 foamed and expanded can be fed to each portion within a molding tool 110, so as to prevent generation of a clearance within the molded foamed heat insulating material 101.

Description

  The present invention relates to a heat insulating structure of a hot water storage type hot water heater provided with a hot water storage tank.

  Generally, when the heat insulation performance of the hot water storage tank mounted on the hot water storage type hot water heater is improved, the performance of the hot water heater itself is improved. For this reason, the conventional technology employs not only foam insulation represented by beaded polystyrene foam (EPS) but also heat insulation performance of hot water storage tanks as a thermal insulation for hot water storage tanks. The thing which improved this is known (patent document 1).

  In addition, as another conventional technique, a heat insulating material that covers and covers almost the entire outer surface of the hot water storage tank, and that is formed by integrally forming a heat insulating foam material made of heat-resistant foamed polystyrene and a vacuum heat insulating material. Is known (Patent Document 2). This heat insulating material is formed so that the vacuum heat insulating material is positioned almost in the center of the foam heat insulating material by pouring the foamed resin into a mold in which the vacuum heat insulating material has been inserted in advance, and further in accordance with the shape of the hot water storage tank. Divided into multiple pieces.

JP 2010-091134 A JP 2007-139072 A

  However, in the prior art of Patent Document 1, the foamed heat insulating material is formed with mounting grooves and mounting holes for mounting the vacuum heat insulating material, and gaps are likely to occur at the positions of these mounting grooves and mounting holes. For this reason, in the prior art of patent document 1, when the heat | fever of a hot water storage tank leaks from the said clearance gap, there exists a problem that the high heat insulation performance of a vacuum heat insulating material cannot fully be exhibited. On the other hand, in the prior art of Patent Document 2, the vacuum heat insulating material is disposed inside the foam heat insulating material (approximately in the center in the thickness direction), and covers the entire surface of the hot water storage tank by combining a plurality of heat insulating materials. Then, it connects so that the edge parts of the vacuum heat insulating material which comprises each heat insulating material may mutually overlap. However, in this configuration, when the foam heat insulating material and the vacuum heat insulating material are integrally formed, a portion where the foam particles do not circulate easily occurs in the mold, and the strength of the heat insulating material is locally reduced at this portion. There's a problem.

  The present invention has been made to solve the above-described problems, and prevents the heat of the hot water storage tank from leaking from the gaps of the heat insulation structure, and the foamed particles are molded when the heat insulation structure is molded. An object of the present invention is to provide a heat insulation structure for a hot water storage type hot water heater capable of improving strength by wrapping around every corner.

  A heat insulation structure for a hot water storage type hot water heater according to the present invention has an inner surface facing a hot water storage tank for storing hot water and an outer surface facing an external space, and foam insulation that covers at least a part of the hot water storage tank from the outside. And a plate-like vacuum heat insulating material provided between the inner side surface and the outer side surface of the foam heat insulating material so as to cover the hot water storage tank. The vacuum heat insulating material is inclined with respect to one surface of the foam heat insulating material so that the distance between at least one of the side surface and the outer surface and the surface of the vacuum heat insulating material varies depending on the part.

  According to the present invention, at the time of molding a heat insulating structure, foamed and expanding foam particles can be smoothly wound around each part in the mold, and a gap is prevented from being formed inside the molded foam heat insulating material. can do. Thereby, the intensity | strength of a heat insulation structure can be improved, and it can prevent that the heat | fever of a hot water storage tank leaks from a clearance gap, and can improve the heat insulation and heat insulation performance of a hot water storage tank.

It is a block diagram which shows the hot water storage type water heater of Embodiment 1 of this invention. It is a disassembled perspective view which expands and shows the heat insulation structure in FIG. It is a longitudinal cross-sectional view which shows the state which fractured | ruptured the heat insulation structure along the plane A in FIG. It is a cross-sectional view which shows the state which fractured | ruptured the heat insulation structure along the plane B in FIG. It is explanatory drawing which shows typically the formation process of the heat insulating material components by the conventional method. It is a longitudinal cross-sectional view which shows typically the formation process of the heat insulation structure by Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows the heat insulation structure by Embodiment 2 of this invention with a shaping | molding die. It is a longitudinal cross-sectional view which shows the heat insulation structure by Embodiment 3 of this invention with a shaping | molding die.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the first to third embodiments described below. Moreover, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
First, Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram illustrating a hot water storage type water heater according to Embodiment 1 of the present invention. The heat pump type hot water heater 1 boils low temperature water such as city water into hot water using a heat source machine and supplies hot water to a desired location, and includes a heat pump unit 10 and a hot water storage unit 20.

  The heat pump unit 10 includes a compressor 11, a water working medium heat exchanger 12, an expansion valve 13, and an evaporator 14. These devices are annularly connected by a working medium circulation pipe 15 to constitute a refrigeration cycle system and function as a heat source machine. The device is housed in the unit case 16. During operation of the refrigeration cycle system, a working medium (refrigerant) such as carbon dioxide is compressed by the compressor 11 and becomes a high temperature and a high pressure. The working medium dissipates heat in the water working medium heat exchanger 12 and is decompressed by the expansion valve 13. Then, the working medium absorbs heat in the evaporator 14 and is sucked into the compressor 11. When carbon dioxide is used as the working medium, it is preferable to operate under conditions where the refrigerant pressure on the high pressure side exceeds the critical pressure of carbon dioxide.

  On the other hand, the hot water storage unit 20 includes a hot water storage tank 21, a water supply pipe 30, a hot water circulation pipe 40, a hot water supply pipe 50, a heat insulating structure 100 described later, and the like, and these devices are accommodated in a unit case 60. Has been. The hot water storage tank 21 is a stacked tank that stores low temperature water supplied from the water supply pipe 30 and high temperature water (hot water) boiled by the heat pump unit 10, and its outer shell is covered with a heat insulating structure 100. Yes. The hot water storage tank 21 is formed in a substantially cylindrical shape with an axis extending in the vertical direction (vertical direction) as a center.

  In the lower part of the hot water storage tank 21, a water inlet 22, a water outlet 23 and a bypass return port (not shown) are provided. A water supply line 30 is connected to the water introduction port 22, and an outgoing pipe 41 of a hot water storage circulation line 40 is connected to the water outlet port 23. In addition, a bypass pipe 43 of a hot water circulation circuit 40 is connected to the bypass return port. On the other hand, a hot water inlet / outlet port 24 is provided in the upper part of the hot water storage tank 21, and a return pipe 42 of a hot water circulating circulation line 40 and a hot water supply line 50 are connected to the hot water inlet / outlet port 24. Yes. The hot water storage tank 21 is always kept full.

  The water supply pipe 30 is a pipe that supplies low-temperature water such as city water to the hot water storage tank 21, the hot water supply pipe 50, and a predetermined hot water supply destination. The first to third water supply pipe sections 31 to 33 and the pressure reducing valve (see FIG. Not shown). The first water supply pipe section 31 connects a water source (not shown) such as water supply and the water introduction port 22 of the hot water storage tank 21, and the second water supply pipe section 32 is branched from the first water supply pipe section 31 to The 1 water supply pipe part 31 and the below-mentioned mixing valve 44 are connected. The third water supply pipe section 33 branches from the first water supply pipe section 31 and connects the first water supply pipe section 31 and a predetermined hot water supply destination. In FIG. 1, one hot water tap 45 is illustrated as an example of a hot water supply destination. The pressure reducing valve is provided on the downstream side of the branch point of the third water supply pipe section 33 in the first water supply pipe section 31, and reduces the water source water pressure to be a predetermined value or less.

  The hot water storage circulation line 40 is a pipe line that reaches from the water outlet port 23 of the hot water storage tank 21 to the hot water inlet / outlet port 24 of the hot water storage tank 21 via the water working medium heat exchanger 12 in the heat pump unit 10. The hot water storage circulation line 40 includes a hot water storage circulation pipe 41 provided with a three-way valve 34 and a heat source pump 35, a hot water storage circulation return pipe 42, and a hot water storage circulation pipe bypass pipe 43. And. The hot water storage circulation pipe forward pipe 41 connects the water outlet port 23 and the three-way valve 34, and the hot water storage circulation pipe return pipe 42 connects the three-way valve 34 and the hot water introduction / outlet port 24 to circulate hot water. The pipe bypass pipe 43 connects the three-way valve 34 and a bypass return port (not shown). During the freeze prevention operation, water that has flowed from the hot water storage tank 21 into the hot water storage circulation pipe forward pipe 41 flows again into the lower part of the tank via the water working medium heat exchanger 12 and the bypass pipe 43.

  The hot water supply pipe 50 mixes the hot water stored in the hot water storage tank 21 and the low temperature water supplied from the water supply pipe 30 with the mixing valve 44 to generate hot water at a predetermined temperature. For example, it is a pipeline that supplies the hot water tap 45). The hot water supply pipe 50 includes first and second hot water supply pipe parts 51 and 52 in addition to the mixing valve 44. The first hot water supply pipe portion 51 connects the hot water introduction / outlet port 24 of the hot water storage tank 21 and the mixing valve 44, and the second hot water supply pipe portion 52 connects the mixing valve 44 and the hot water tap 45. In FIG. 1, the outflow direction of the hot water from the hot water tap 45 is indicated by an arrow.

  Among the constituent members of the hot water storage unit 20 described above, a part of the water supply pipe 30, the hot water circulation pipe 40 and the hot water supply pipe 50 extends to the outside of the unit case 60, and the remaining constituent members Are housed in a unit case 60.

  Next, the heat insulating structure 100 that is a feature of the present embodiment will be described with reference to FIGS. 2 to 6. FIG. 2 is an exploded perspective view showing the heat insulating structure in FIG. 1 in an enlarged manner. As shown in this figure, the heat insulating structure 100 includes a plurality of divided heat insulating materials 100A to 100E, and by assembling these divided heat insulating materials 100A to 100E, at least one of the hot water storage tanks 21 having a substantially cylindrical shape. It is comprised so that a part may be covered. Thereby, the heat insulation structure 100 performs the heat insulation and heat insulation of the hot water storage tank 21. In the present invention, the number and shape of the divided heat insulating materials are not limited to those of the first embodiment. For example, a shape in which the divided heat insulating materials are partially cut out in order to connect a pipe, A structure in which the lid is covered with another heat insulating material is also possible.

  Here, each divided heat insulating material will be described. First, the upper divided heat insulating material 100A covering the upper surface portion of the hot water storage tank 21 and the lower divided heat insulating material 100B covering the lower surface portion of the hot water storage tank 21 are, for example, substantially hemispherical. It is formed as a lid body (bottom body) that is curved. Moreover, the divided heat insulating materials 100C and 100D on the side surface portions covering the outer peripheral surface (side surface) of the hot water storage tank 21 have a shape obtained by curving a rectangular flat plate into a semicircular arc shape, and abutting both end surfaces. It is comprised so that it may become a cylindrical heat insulating material. In addition, one divided heat insulating material 100D is provided with a cut-through portion (through hole), and this portion is configured to be covered with the divided heat insulating material 100E. Furthermore, the end surfaces of the divided heat insulating materials 100 </ b> A to 100 </ b> E are provided with fitting structures (not shown) each including a protrusion or a groove. And the division | segmentation heat insulating materials 100A-100E are mutually connected by this fitting structure, and it is comprised so that the heat | fever of the hot water storage tank 21 may leak out of the heat insulation structure 100 outside.

  Each of the divided heat insulating materials 100 </ b> A to 100 </ b> E is configured by one of two types of heat insulating materials including a single material type heat insulating material and a composite material type heat insulating material. A single material type heat insulating material is formed using only a non-vacuum heat insulating material (for example, a foam heat insulating material), and a composite material type heat insulating material combines a non-vacuum heat insulating material and a vacuum heat insulating material ( Formed integrally). The non-vacuum heat insulating material used for the heat insulating material of the composite material type is configured by a foam heat insulating material such as a bead method polystyrene foam (EPS) heat insulating material.

  Of the divided heat insulating materials 100A to 100E, which of the divided heat insulating materials is constituted by a single material type (or composite material type) heat insulating material can be arbitrarily selected. For example, it is preferable that the side-part divided heat insulating material 100 </ b> C that does not have a cut-out portion and can be formed only by curving a flat vacuum heat insulating material is composed of a composite material type heat insulating material. In addition, the other divided heat insulating materials 100A, 100B, 100D, and 100E can be easily constituted by a single material type heat insulating material, but the present invention is not limited thereto. That is, in this invention, you may comprise all the division | segmentation heat insulating materials 100A-100E with a composite material type heat insulating material.

  Next, with reference to FIG.3 and FIG.4, the division | segmentation heat insulating material 100C of the side part which consists of a composite material type heat insulating material is demonstrated. 3 is a longitudinal sectional view showing a state in which the heat insulating structure is broken along the plane A in FIG. 2, and FIG. 4 shows a state in which the heat insulating structure is broken along the plane B in FIG. It is a cross-sectional view. As shown in these drawings, the divided heat insulating material 100C includes a foam heat insulating material 101 and a vacuum heat insulating material 102, which will be described later, and is formed in a semi-cylindrical plate shape, for example.

  The foam heat insulating material 101 is formed in a semi-cylindrical plate shape by an EPS heat insulating material or the like, and has an inner side surface 101a disposed facing the side surface of the hot water storage tank 21 and an outer side surface 101b disposed facing the external space. And have. These inner side surface 101 a and outer side surface 101 b constitute the surface of the foam heat insulating material 101. In the present embodiment, the foam heat insulating material 101 is formed with a certain thickness in the radial direction, and the inner side surface 101a and the outer side surface 101b are arranged in parallel to each other. Here, the thickness of the foam heat insulating material 101 is a dimension corresponding to the distance between the inner side surface 101a and the outer side surface 101b in the left-right direction in FIG. 3 (the radial direction in FIG. 4). And the foaming heat insulating material 101 is arrange | positioned so that the vertical direction and the circumferential direction may be extended along the side surface of the hot water storage tank 21, and the hot water storage tank 21 may be covered from the outer side.

  On the other hand, the vacuum heat insulating material 102 is composed of, for example, a core material and a vacuum heat insulating material outer shell (both not shown). The core material is sealed in a vacuum heat insulating shell made of a gas barrier laminate film, for example, in a pressure state close to vacuum. Further, the vacuum heat insulating material 102 has, for example, a substantially rectangular vacuum heat insulating material having a long side extending in the vertical direction and a short side extending in the horizontal direction, curved in a semi-cylindrical shape, thereby having substantially the same shape as the foam heat insulating material 101. It is formed in a plate shape. Further, the vacuum heat insulating material 102 is integrally formed with the foam heat insulating material 101 using means such as insert molding, and extends between the inner side surface 101a and the outer side surface 101b while being embedded in the foam heat insulating material 101. Exist. Thereby, the vacuum heat insulating material 102 is arrange | positioned so that the hot water storage tank 21 may be covered from the outer side with the foam heat insulating material 101. FIG.

  Moreover, in this Embodiment, the vacuum heat insulating material so that the distance d between the surface (the inner surface 101a and the outer surface 101b) of the foam heat insulating material 101 in the horizontal direction and the surface of the vacuum heat insulating material 102 may vary depending on the part. 102 is inclined with respect to the inner side surface 101a and the outer side surface 101b of the foam heat insulating material 101 (see FIG. 3). Specifically, first, the divided heat insulating material 100C is arranged along the side surface of the hot water storage tank 21 extending in the vertical direction. In this state, the vacuum heat insulating material 102 is disposed such that one end of the long side of the shape (rectangular shape) before being bent is on the upper side and the other end of the long side is on the lower side. And the vacuum heat insulating material 102 inclines with respect to the perpendicular direction so that it may approach the inner surface 101a of the foam heat insulating material 101 by the lower side rather than the upper side. That is, as shown in FIG. 3, the distance d1 between the upper surface of the vacuum heat insulating material 102 and the inner surface 101a of the foam heat insulating material 101 is the distance between the lower surface of the vacuum heat insulating material 102 and the inner surface 101a. It is set to be larger than d2 (d1> d2). D1 and d2 indicate specific examples of the distance d.

  Next, with reference to FIG.5 and FIG.6, the effect by the said structure is demonstrated. First, FIG. 5 is explanatory drawing which shows typically the formation process of the heat insulating material components by the conventional method. As shown in this figure, in the conventional heat insulating material part 120, the foam heat insulating material 121 and the vacuum heat insulating material 122 are integrally formed, but the vacuum heat insulating material 122 is formed on the surface of the foam heat insulating material 121 (inner surface and outer surface). Are arranged parallel to the side surface.

  In the case of manufacturing the conventional heat insulating material part 120, first, the vacuum heat insulating material 122 is disposed inside the mold 130 such as a mold, and in this state, a preliminary operation is performed from the expanded particle insertion port 130a provided in the mold 130. The expanded particle 131 is inserted. Next, the pre-expanded particles 131 are expanded (expanded) in the mold 130 by spraying steam into the mold 130. Thereby, the heat insulating material component 120 in which the vacuum heat insulating material 122 is integrally formed inside the foam heat insulating material 121 can be manufactured. In the molding step, it is difficult to mold the foam heat insulating material 121 in a state where the vacuum heat insulating material 122 is floated in the space in the mold 130. For example, the vacuum heat insulating material 122 is fixed to a thin plate-shaped foam heat insulating material. A method in which a part is prepared in advance and the pre-expanded particles 131 are inserted in a state where the part is placed in the mold 130 is employed.

  In the conventional molding process, the vacuum heat insulating material 122 formed in a plate shape is arranged in parallel with the inner surface of the molding die 130. Therefore, the pre-expanded particles 131 inserted from the expanded particle insertion port 130a expand in a flat and parallel space formed between the mold 130 and the vacuum heat insulating material 122, thereby free expansion. (Flow) is easily disturbed. As a result, in the conventional molding process, the pre-expanded particles 131 cannot be uniformly expanded over the entire mold 130, and the pre-expanded particles 131 are not particularly filled in the upper and lower ends of the vacuum heat insulating material 122. There is a problem that a gap is likely to occur (the foam heat insulating material 121 is not formed).

  On the other hand, FIG. 6 is a longitudinal cross-sectional view schematically showing a molding process of the heat insulating structure according to Embodiment 1 of the present invention. As shown in this figure, in this embodiment, the vacuum heat insulating material 102 is inclined inside the foam heat insulating material 101. Corresponding to this configuration, in the mold 110 used in the molding process of the present embodiment, the vacuum heat insulating material 102 is in the positions close to the inner side surface 101a and the outer side surface 101b of the foam heat insulating material 101, respectively, and the expanded particle insertion port 110a. 110b are arranged. That is, if the mold 110 is described as a reference, the vacuum heat insulating material 102 has a distance between the inner surface of the mold 110 and the vacuum heat insulating material 102 at a position facing the foamed particle insertion port 110a (110b) of the mold 110. Inclination is such that the distance between the inner surface of the mold 110 and the vacuum heat insulating material 102 increases as the distance decreases from the facing position.

  Thereby, in the state before inserting the pre-expanded particle 111, between the inner surface of the shaping | molding die 110 and the vacuum heat insulating material 102, it expands upwards from the opening position of the expanded particle insertion port 110a upwards. And a space that expands in an inverted V shape downward from the opening position of the expanded particle insertion opening 110b. The pre-expanded particles 111 inserted into the mold 110 have a characteristic of expanding from a narrow space toward a wide space. For this reason, in the molding step of the foam heat insulating material 101, the pre-foamed particles 111 inserted from the foamed particle insertion port 110a of the mold 110 can be smoothly expanded upward along the V-shaped space. Thereby, the pre-expanded particle 111 which expand | swells can be made to wrap around to the back surface side of the vacuum heat insulating material 102 seeing from the expanded particle insertion port 110a stably.

  Accordingly, since the pre-expanded particles 111 can be smoothly wound to every corner in the mold 110, a gap is prevented from being formed inside the molded foam heat insulating material 101, and the strength of the divided heat insulating material 100C is improved. Can be made. Moreover, the heat of the hot water storage tank 21 can be prevented from leaking from the gap, and the heat retention and heat insulation performance of the hot water storage tank 21 can be enhanced. On the other hand, also on the outer surface 101b of the foam heat insulating material 101, the pre-foamed particles 111 inserted from the foamed particle insertion port 110b of the mold 110 are smoothly expanded downward along the inverted V-shaped space, so that the foamed particles As viewed from the insertion port 110b, the vacuum insulation material 102 can be stably wound around. Thereby, the same effect as the foam particle insertion port 110a side can be obtained also on the foam particle insertion port 110b side.

  In particular, the pre-expanded particles 111 inserted into the mold 110 need to expand (move) a longer distance along the longer side than the shorter side of the vacuum heat insulating material 102. For this reason, in this Embodiment, it is set as the structure which inclines the vacuum heat insulating material 102 to a longitudinal direction. Thereby, the V-shaped (and inverted V-shaped) space can be extended in the longitudinal direction of the vacuum heat insulating material 102, and the pre-expanded particles 111 can be efficiently expanded in the longitudinal direction.

  Further, the divided heat insulating material 100 </ b> C is disposed along the side surface of the hot water storage tank 21. Since the hot water storage tank 21 is a stacked type in which high temperature water is stored on the upper side and low temperature water is stored on the lower side, the upper side is hotter. On the other hand, the vacuum heat insulating material 102 has characteristics that are relatively weak against heat. For this reason, in this Embodiment, the vacuum heat insulating material 102 is made to incline with respect to a perpendicular direction so that it may approach the inner surface of the said foam heat insulating material by the lower side rather than the upper side. Thereby, a large distance can be ensured between the hot water storage tank 21 and the vacuum heat insulating material 102 on the upper side where the hot water storage tank 21 becomes high temperature. Therefore, the vacuum heat insulating material 102 can be protected from the heat of the hot water storage tank 21, and the durability of the divided heat insulating material 100C can be improved.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 7 is a longitudinal sectional view showing a heat insulating structure (divided heat insulating material) according to Embodiment 2 of the present invention together with a mold. As shown in this figure, in this embodiment, a plurality of (for example, two) vacuum heat insulating materials 202 are provided inside the foam heat insulating material 201. Here, the foam heat insulating material 201 has an inner surface 201a and an outer surface 201b arranged in parallel to each other, as in the first embodiment. Further, the two vacuum heat insulating materials 202 are formed in a substantially rectangular shape, and the inner side surface 201a and the outer side surface 201b (vertical direction) are arranged closer to the inner side surface 201a of the foam heat insulating material 201 on the lower side than the upper side. It is inclined with respect to. Further, the vacuum heat insulating materials 202 are embedded in the foam heat insulating material 201 in a state of being separated so as not to touch each other, and are arranged in parallel to each other.

  In the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as in the first embodiment. In particular, in this embodiment, by dividing the vacuum heat insulating material disposed inside the foam heat insulating material 201 into two vacuum heat insulating materials 202, it is possible to cope with the dimensional constraints of the vacuum heat insulating material, and the design freedom. The degree can be increased. In addition, by disposing the vacuum heat insulating materials 202 in parallel to each other, it is possible to stably ensure an interval (gap) having a certain dimension between two adjacent vacuum heat insulating materials 202. Thereby, in the formation process of the foam heat insulating material 201, the pre-expanded particles 111 can be smoothly wound between the vacuum heat insulating materials 202.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 8 is a longitudinal sectional view showing a heat insulating structure (divided heat insulating material) according to Embodiment 3 of the present invention together with a mold. As shown in this figure, in this embodiment, the foam heat insulating material 301 is formed so as to gradually become thinner from the upper side toward the lower side. Here, although the foam heat insulating material 301 has the inner side surface 301a and the outer side surface 301b in substantially the same manner as in the first embodiment, the outer side surface 301b is closer to the inner side surface 301a on the lower side than the upper side. Inclined. Moreover, the vacuum heat insulating material 302 is formed in a substantially rectangular shape, and is inclined with respect to the inner side surface 301a (vertical direction) so as to be closer to the inner side surface 301a of the foamed heat insulating material 301 on the lower side than the upper side.

  In the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as in the first embodiment. In particular, in the present embodiment, since the lower side of the foam heat insulating material 301 can be formed thin, in the molding process, the pre-foamed particles 111 that expand and expand are used as the foamed particle insertion openings 110a ′ of the mold 110 ′. As a result, it is possible to smoothly wrap around the back side of the vacuum heat insulating material 302. Moreover, the usage-amount of the pre-expanded particle 111 can be reduced and cost reduction can be promoted. And since the lower part side of the foam heat insulating material 301 is arrange | positioned along the low-temperature part of the laminated | stacked hot water storage tank 21, sufficient heat insulation performance (heat retention performance) can be ensured even if it thins.

  Further, according to the present embodiment, for example, a lower thin portion of the foam heat insulating material 301 is formed in advance, and a part in which the vacuum heat insulating material 302 is fixed to this portion is placed in the mold 110. The manufacturing method in which the pre-expanded particles 111 are inserted into the mold 110 ′ can be easily employed. Thereby, the foam heat insulating material 301 can be smoothly shape | molded in the state which floated the vacuum heat insulating material 302 in the space in shaping | molding die 110 ', and manufacturing efficiency can be improved.

  In the first and second embodiments, the inner side surfaces 101a and 201a and the outer side surfaces 101b and 201b of the foam heat insulating materials 101 and 201 are formed in parallel, and the vacuum heat insulating materials 102 and 202 are connected to the inner side surfaces 101a and 201a and the outer side surfaces 101a and 201a. The case where it inclines with respect to both the side surfaces 101b and 201b was illustrated. However, the present invention is not limited thereto, and the inner surface and the outer surface of the foam heat insulating material may not be formed in parallel, and the vacuum heat insulating material may be inclined with respect to only one of the inner surface and the outer surface. . Moreover, in this invention, it is good also as a structure which inclines a vacuum heat insulating material with respect to a direction (long side extension direction) perpendicular | vertical to a longitudinal direction, Furthermore, a vacuum heat insulating material is a foaming heat insulating material of the lower side rather than the upper side. You may incline so that it may leave | separate from an inner surface.

  In Embodiments 1 to 3, the case where the foam heat insulating materials 101, 201, 301 and the vacuum heat insulating materials 102, 202, 302 are formed in a substantially rectangular shape is illustrated, but the present invention is not limited thereto, and any arbitrary It may be formed into a shape. Furthermore, in Embodiments 1 to 3, the features of the present invention are applied to the divided heat insulating material 100C in the heat insulating structure 100. However, the present invention is not limited to all of the divided heat insulating materials 100A to 100E or any of the divided heat insulating materials 100A to 100E. Can be applied to a part.

  In the second embodiment, the case where two vacuum heat insulating materials 202 are arranged inside the foam heat insulating material 201 is exemplified. However, in the present invention, the number of vacuum heat insulating materials arranged inside the foam heat insulating material is as follows. Two or more arbitrary numbers may be set.

  The present invention may be realized by combining the second and third embodiments. That is, in the present invention, a plurality of vacuum heat insulating materials may be disposed inside the foam heat insulating material, and the foam heat insulating material may be formed so as to gradually become thinner from the upper side toward the lower side.

1 Heat pump water heater (hot water storage water heater)
21 Hot water storage tank 100 Heat insulation structure 100A-100E Division heat insulation material 101,201,301 Foam heat insulation material 101a, 201a, 301a Inner side surface 101b, 201b, 301b Outer side surface 102,202,302 Vacuum heat insulation material 110,110 'Mold 110a , 110a ′, 110b, 110b ′ Expanded particle insertion slot 111 Pre-expanded particles

Claims (6)

A foam heat insulating material having an inner surface facing a hot water storage tank for storing hot water and an outer surface facing an external space, and covering at least a part of the hot water storage tank from the outside;
A plate-like vacuum heat insulating material provided inside the foam heat insulating material and extending between an inner surface and an outer surface of the foam heat insulating material so as to cover the hot water storage tank;
The vacuum heat insulating material is inclined with respect to one surface of the foam heat insulating material so that a distance between at least one of the inner surface and the outer surface of the foam heat insulating material and the surface of the vacuum heat insulating material varies depending on a part. A heat insulation structure of a hot water storage type water heater that is configured to be allowed to move.   The vacuum heat insulating material is formed by a substantially rectangular plate material having a long side and a short side, and is inclined so as to be closer to the inner surface of the foam heat insulating material on the other end side than the one end side of the long side. The heat insulation structure of the hot water storage type water heater according to claim 1.   The foam heat insulating material is disposed along a side surface of the hot water storage tank extending in the vertical direction, and the vacuum heat insulating material is positioned closer to the inner side surface of the foam heat insulating material on the lower side than the upper side. The heat insulation structure of the hot water storage type hot water supply device according to claim 1 or 2, wherein the heat insulation structure is configured to be inclined.   The heat insulation structure of the hot water storage type hot water heater according to claim 3, wherein the foam heat insulating material is formed so as to be gradually thinned from the upper side toward the lower side.   The hot water storage device according to any one of claims 1 to 4, wherein a plurality of the vacuum heat insulating materials that are inclined with respect to at least the one surface and spaced apart from each other are disposed inside the foam heat insulating material. Insulation structure of water heater.   The vacuum heat insulating material has a smaller distance between the inner surface of the mold and the vacuum heat insulating material at a position facing a foamed particle insertion port of a mold for forming the foam heat insulating material, The heat insulation structure of the hot water storage type hot water heater according to any one of claims 1 to 5, wherein the heat insulation structure is inclined so that a distance between an inner side surface of the mold and the vacuum heat insulating material is increased.

Images