Heat storage device and method for manufacturing the same

Abstract

To provide a heat storage device advantageous in terms of stability of supercooling of a latent heat storage material.SOLUTION: A heat storage device 1 comprises a shell 5 comprising an internal space including a first space 2, a second space 3, and a third space 4. A latent heat storage material 6 is housed in the third space 4. A heat transfer pipe 7 comprises an outer surface 70 in contact with the third space 4, and causes the first space 2 and the second space 3 to communicate with each other. A first header member 8 separates the first space 2 from the third space 4. A first joint material 10 exists in at least a first joint part 84 between the first header member 8 and the outer surface 70 of the heat transfer pipe 7. An area of the first joint material 10 in contact with the first space 2 is larger than an area of the first joint material 10 in contact with the third space 4. The heat transfer pipe 7 and the first header member 8 include aluminum or an aluminum alloy as a main material.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a heat storage device and a method for manufacturing a heat storage device. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a heat storage device using a latent heat storage material is known.

[0003] For example, Patent Document 1 describes a heat storage device including a container filled with a latent heat storage material capable of supercooling. Aluminum oxide can be used as the material for the container. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4714923 Summary of the Invention [Problem to be solved by the invention]

[0005] The present disclosure provides a heat storage device formed by joining components primarily made of aluminum or an aluminum alloy, which has a space for accommodating a latent heat storage material, while being advantageous in terms of the stability of supercooling of the latent heat storage material. [Means for solving the problem]

[0006] The present disclosure relates to a shell having an internal space including a first space, a second space separated from the first space, and a third space formed between the first space and the second space, the first space, the third space, and the second space being arranged in this order along a reference plane; A latent heat storage material accommodated in the third space; A heat transfer tube including aluminum or an aluminum alloy as a main material, the heat transfer tube having an outer surface in contact with the third space and communicating between the first space and the second space; A first header member that divides the first space and the third space and is mainly made of aluminum or an aluminum alloy; a first bonding material present at least in a first bonding portion between the first header member and the outer surface of the heat transfer tube, An area of ​​the first bonding material in contact with the first space is larger than an area of ​​the first bonding material in contact with the third space. A thermal storage device is provided. Effect of the Invention

[0007] According to the present disclosure, a space for accommodating a latent heat storage material is formed by joining components whose main material is aluminum or an aluminum alloy, and this is advantageous from the standpoint of the stability of supercooling of the latent heat storage material. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view showing a heat storage device according to an embodiment. [Diagram 2] FIG. 2 is an enlarged cross-sectional view of a portion of the heat storage device shown in FIG. [Diagram 3] FIG. 3 is an enlarged cross-sectional view of another part of the heat storage device shown in FIG. [Figure 4] FIG. 4 is a cross-sectional view showing a part of a method for manufacturing a heat storage device. [Diagram 5] FIG. 5 is a cross-sectional view showing another part of the method for manufacturing a heat storage device. [Figure 6] FIG. 6 is a cross-sectional view showing still another part of the method for manufacturing a heat storage device. [Figure 7] FIG. 7 is a cross-sectional view showing still another part of the method for manufacturing a heat storage device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (Findings on which this disclosure is based) In a heat storage device, it is considered that a space for accommodating a latent heat storage material is formed by joining members whose main material is aluminum or an aluminum alloy. In this case, an auxiliary agent such as a flux may be used to join the members. According to the study by the present inventors, it has been newly found that the use of an auxiliary agent such as a flux may impair the stability of supercooling of the latent heat storage material accommodated in the heat storage device.

[0010] When aluminum ions are dissolved from a member mainly made of aluminum or an aluminum alloy into a latent heat storage material, the aluminum ions can act as nuclei to promote crystallization of the latent heat storage material. As a result, the stability of supercooling of the latent heat storage material is easily impaired. In order to suppress the dissolution of aluminum ions from the member into the latent heat storage material, it is possible to passivate the surface of the member by treatment such as anodizing and boehmite treatment. On the other hand, on the surface of the member, the portion to which the auxiliary agent such as flux used for joining the member is attached is unlikely to be passive. In this case, when the auxiliary agent such as flux is separated from the member due to vibration or the like, the surface of the member that is not passive is exposed to the latent heat storage material. As a result, aluminum ions are dissolved from the surface into the latent heat storage material, and the stability of supercooling of the latent heat storage material may be impaired. Therefore, the present inventors have conducted extensive research into the configuration of a heat storage device in which the auxiliary agent such as flux used for joining the member mainly made of aluminum or an aluminum alloy is unlikely to come into contact with the latent heat storage material. As a result, the heat storage device of the present disclosure was finally devised.

[0011] (Summary of one aspect of the present disclosure) The heat storage device according to the first aspect of the present disclosure includes: a shell having an internal space including a first space, a second space separated from the first space, and a third space formed between the first space and the second space, the first space, the third space, and the second space being arranged in this order along a reference plane; A latent heat storage material accommodated in the third space; A heat transfer tube including aluminum or an aluminum alloy as a main material, the heat transfer tube having an outer surface in contact with the third space and communicating between the first space and the second space; A first header member that divides the first space and the third space and is mainly made of aluminum or an aluminum alloy; a first bonding material present at least in a first bonding portion between the first header member and the outer surface of the heat transfer tube, An area of ​​the first bonding material in contact with the first space is larger than an area of ​​the first bonding material in contact with the third space.

[0012] According to the first aspect, in the manufacture of the heat storage device, even if an auxiliary agent such as flux is not supplied to the space that is to form the third space, the first bonding portion is easily formed by supplying an auxiliary agent such as flux to the space that is to form the first space. This makes it difficult for an auxiliary agent such as flux to be present in the third space. Therefore, the heat storage device according to the first aspect is advantageous in terms of the stability of supercooling of the latent heat storage material.

[0013] In a second aspect of the present disclosure, for example, in the heat storage device according to the first aspect, the first joint may have a thickness that decreases from the first space toward the third space in a portion filling the space between the first header member and the outer surface of the heat transfer tube. According to the second aspect, it is possible to more reliably prevent aluminum ions from dissolving into the latent heat storage material from a main material contained in the outer surface of the heat transfer tube or the second main surface of the first header member.

[0014] In a third aspect of the present disclosure, for example, in the heat storage device according to the first or second aspect, the outer surface of the heat transfer tube may have a first tapered portion formed from the third space toward the first space. In addition, the first joint portion may be formed around the first tapered portion. According to the third aspect, in manufacturing the heat storage device, it is easy to insert the heat transfer tube into the first header member. In addition, the first joint portion is likely to have a thickness that decreases from the first space toward the third space.

[0015] In a fourth aspect of the present disclosure, for example, in the heat storage device according to any one of the first to third aspects, the first header member may have a first protruding portion that protrudes from the first space toward the third space or from the third space toward the first space along the first joint. According to the fourth aspect, the first joint is likely to be large, and the first header member and the outer surface of the heat transfer tube are likely to be well joined.

[0016] In a fifth aspect of the present disclosure, for example, in the heat storage device according to any one of the first to fourth aspects, the first bonding material may include a brazing material. According to the fifth aspect, the first header member and the outer surface of the heat transfer tube are easily bonded to each other satisfactorily.

[0017] A method for manufacturing a heat storage device according to a sixth aspect of the present disclosure includes: a first header member including aluminum or an aluminum alloy as a main material and having a through hole disposed in an internal space of the shell to divide the internal space; Inserting one end of a heat transfer tube including aluminum or an aluminum alloy as a main material into the through hole of the first header member; In a first space in which the one end of the internal space exists, a flux is applied to a portion to be joined between the first header member and the heat transfer tube, while an area around the portion to be joined is heated and cooled, thereby joining the first header member and the heat transfer tube by brazing.

[0018] According to the sixth aspect, the flux is attached in the first space where one end of the heat transfer tube is present, so by accommodating the latent heat storage material in the space where one end of the heat transfer tube is not present, the flux is unlikely to be present in the space where the latent heat storage material is accommodated. Therefore, in the space where the latent heat storage material is accommodated, aluminum ions are prevented from dissolving from the outer surface of the heat transfer tube, the inner surface of the shell, and the first header member into the latent heat storage material. As a result, a heat storage device in which the supercooling of the latent heat storage material is likely to be stable can be manufactured.

[0019] A heat storage device according to a seventh aspect of the present disclosure includes: a shell having an internal space including a first space, a second space separated from the first space, and a third space formed between the first space and the second space, the first space, the third space, and the second space being arranged in this order along a reference plane; A latent heat storage material accommodated in the third space; A heat transfer tube including aluminum or an aluminum alloy as a main material, the heat transfer tube having an outer surface in contact with the third space and communicating between the first space and the second space; a first header member including aluminum or an aluminum alloy as a main material, the first header member having a first main surface in contact with the first space, a second main surface in contact with the third space, a through hole into which the heat transfer tube is fitted, and a cylindrical collar provided around the through hole so as to protrude in a direction parallel to the longitudinal direction of the heat transfer tube, and separating the first space from the third space; a brazed joint provided between the collar and the heat transfer tube to join the heat transfer tube and the first header member.

[0020] In an eighth aspect of the present disclosure, for example, in the heat storage device according to the seventh aspect, the brazed joint may include a portion in which a cross-sectional area in a direction perpendicular to a longitudinal direction of the heat transfer tube decreases continuously or stepwise from the first space side toward the third space side.

[0021] In a ninth aspect of the present disclosure, for example, in the heat storage device according to the seventh or eighth aspect, an area of ​​the brazed joint facing the first space may be larger than an area of ​​the brazed joint facing the third space.

[0022] In a tenth aspect of the present disclosure, for example, in the heat storage device according to any one of the seventh to ninth aspects, the collar may protrude toward the third space. In addition, the brazed joint may be provided only on the first space side with respect to the position of the tip of the collar.

[0023] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The present disclosure is not limited to the following embodiments.

[0024] (Embodiment) FIG. 1 is a cross-sectional view showing a heat storage device 1 according to an embodiment. FIG. 2 is a cross-sectional view showing an enlarged portion of the heat storage device 1 shown in FIG. 1. As shown in FIG. 1, the heat storage device 1 includes a shell 5. The shell 5 has an internal space including a first space 2, a second space 3, and a third space 4. The second space 3 is separated from the first space 2. The third space 4 is formed between the first space 2 and the second space 3. The first space 2, the third space 4, and the second space 3 are arranged in this order along a reference plane. The latent heat storage material 6 is accommodated in the third space 4. The heat storage device 1 includes a heat transfer tube 7. The heat transfer tube 7 has an outer surface 70 in contact with the third space 4. The heat transfer tube 7 communicates between the first space 2 and the second space 3. The heat storage device 1 includes a first header member 8. The first header member 8 separates the first space 2 and the third space 4. The first header member 8 has, for example, a first main surface 81 and a second main surface 82. The first main surface 81 is in contact with, for example, the first space 2. The second main surface 82 is in contact with, for example, the third space 4. The first header member 8 is, for example, a plate-shaped member. The first main surface 81 is located, for example, on the opposite side to the second main surface 82 in the thickness direction of the first header member 8. In this specification, the "main surface" means, for example, a pair of parallel surfaces having a relatively large area in a plate-shaped member, and each main surface is, for example, a continuous surface. The heat transfer tube 7 and the first header member 8 contain aluminum or an aluminum alloy as a main material. In this specification, the "main material" means the substance that is contained most abundantly by mass.

[0025] As shown in FIG. 2, the heat storage device 1 includes a first bonding material 10. The first bonding material 10 is present at least in a first bonding portion 84. The first bonding portion 84 is present between the first header member 8 and the outer surface 70 of the heat transfer tube 7. The area of ​​the first bonding material 10 in contact with the first space 2 is larger than the area of ​​the first bonding material 10 in contact with the third space 4. The first bonding portion 84 bonds, for example, the first header member 8 and the outer surface 70 of the heat transfer tube 7. The first bonding material 10 is away from, for example, the second main surface 82. The first bonding portion 84 is not formed on, for example, the second main surface 82.

[0026] The heat storage device 1 includes, for example, a second bonding material. The second bonding material is present at least in, for example, the second bonding portion. The second bonding portion is present, for example, between the peripheral portion of the first header member 8 and the inner surface of the shell 5. The area of ​​the second bonding material in contact with the first space 2 is larger than the area of ​​the second bonding material in contact with the third space 4. The second bonding portion bonds, for example, the peripheral portion of the first header member 8 to the inner surface of the shell 5. The second bonding material is away from, for example, the second main surface 82. The second bonding portion is not formed on, for example, the second main surface 82. The shell 5 may contain aluminum or an aluminum alloy as a main material. According to this configuration, in the manufacture of the heat storage device 1, even if an auxiliary agent such as flux is not supplied to the space that is to form the third space 4, the first bonding portion 84 is easily formed by supplying an auxiliary agent such as flux to the space that is to form the first space 2. As a result, an auxiliary agent such as flux is less likely to be present in the third space 4. Therefore, in the third space 4, aluminum ions are prevented from eluting from the inner surface of the shell 5, the outer surface 70 of the heat transfer tube 7, and the first header member 8 to the latent heat storage material 6. As a result, the supercooling of the latent heat storage material 6 is likely to be stable. In addition, an oxide film is typically formed on the inner surface of the shell 5, the outer surface 70 of the heat transfer tube 7, and the first header member 8. In the joining of each member, the oxide film is removed from the portion where the auxiliary agent such as flux contacts. According to the above-mentioned configuration, the auxiliary agent such as flux does not need to be used in the space that is to form the third space 4. As a result, since the oxide film formed in the space that is to form the third space 4 is difficult to remove, the elution of aluminum ions can be prevented even if the space that is to form the third space 4 is not subjected to treatment such as anodizing and boehmite treatment. This can reduce costs in the manufacture of the heat storage device 1.

[0027] 1, the heat storage device 1 further includes, for example, a supply port 14 and a discharge port 15. The supply port 14 opens into the first space 2. For example, the heat medium is guided from the outside of the heat storage device 1 to the first space 2 through the supply port 14. The discharge port 15 opens into the second space 3. The heat medium guided to the first space 2 passes through the inside of the heat transfer tube 7 and is guided to the second space 3. Thereafter, the heat medium is guided from the second space 3 to the outside of the heat storage device 1 through the discharge port 15.

[0028] As shown in FIG. 2, the first joint 84 has a thickness that decreases from the first space 2 toward the third space 4, for example. The first joint 84 includes, for example, a portion that fills the gap between the first header member 8 and the outer surface 70 of the heat transfer tube 7. The thickness of the first joint 84 means the distance between the surface where the first header member 8 and the first joint 84 are joined and the surface where the first joint 84 and the outer surface 70 of the heat transfer tube 7 are joined. The thickness of the first joint 84 is measured, for example, along a direction perpendicular to the longitudinal direction of the heat transfer tube 7. With this configuration, for example, in the manufacture of the heat storage device 1, it is easy to arrange the members so that the space where the first joint 84 is to be formed has a thickness that decreases from the first space 2 toward the third space 4. In this case, even if an auxiliary agent such as flux is supplied in the space where the first space 2 is to be formed in the manufacture of the heat storage device 1 to form the first joint 84, the auxiliary agent is unlikely to reach the space where the third space 4 is to be formed. As a result, in the third space 4, elution of aluminum ions from the outer surface 70 of the heat transfer tube 7 and the first header member 8 into the latent heat storage material 6 is suppressed, and supercooling of the latent heat storage material 6 is more reliably and stably achieved.

[0029] As shown in FIG. 2, the first header member 8 may have a first protruding portion 20. The first protruding portion 20 protrudes, for example, from the first space 2 toward the third space 4 along the first joint portion 84. However, the first protruding portion 20 may protrude in the opposite direction to that in FIG. 2, that is, from the third space 4 toward the first space 2 along the first joint portion 84. According to such a configuration, for example, the first joint portion 84 is likely to be large, and the first header member 8 and the outer surface 70 of the heat transfer tube 7 are likely to be joined well. As a result, the heat storage device 1 is likely to have excellent durability. The tip of the first protruding portion 20 may be in contact with the outer surface 70 of the heat transfer tube 7. The first protruding portion 20 in the first header member 8 may be formed by burring.

[0030] As shown in FIG. 2, the outer surface 70 of the heat transfer tube 7 may have a first tapered portion 71. The first tapered portion 71 is formed, for example, from the third space 4 toward the first space 2 in the longitudinal direction of the heat transfer tube 7. The first joint portion 84 is formed, for example, around the first tapered portion 71. According to this configuration, for example, in the manufacture of the heat storage device 1, each member is easily arranged so that the space to form the first joint portion 84 has a thickness that decreases from the first space 2 toward the third space 4. In this case, even if an auxiliary agent such as flux is supplied in the space to form the first space 2 to form the first joint portion 84 in the manufacture of the heat storage device 1, the auxiliary agent is unlikely to reach the space to form the third space 4. As a result, in the third space 4, the elution of aluminum ions from the outer surface 70 of the heat transfer tube 7 and the first header member 8 into the latent heat storage material 6 is suppressed, and the supercooling of the latent heat storage material 6 is more reliably and stably achieved. In addition, according to this configuration, for example, the heat transfer tube 7 is easily inserted into the first header member 8, so that the heat storage device 1 can be easily manufactured.

[0031] The second joint has a thickness that decreases from the first space 2 toward the third space 4. The second joint includes, for example, a portion that fills the gap between the first header member 8 and the inner surface of the shell 5. The thickness of the second joint means the distance between the surface where the peripheral portion of the first header member 8 and the second joint are joined and the surface where the second joint and the inner surface of the shell 5 are joined. The thickness of the second joint is measured, for example, along a direction perpendicular to the inner surface of the shell 5. According to such a configuration, for example, in the manufacture of the heat storage device 1, it is easy to arrange each member so that the space where the second joint is to be formed has a thickness that decreases from the first space 2 toward the third space 4. In this case, even if an auxiliary agent such as flux is supplied in the space where the first space 2 is to be formed in the manufacture of the heat storage device 1 to form the second joint, the auxiliary agent is unlikely to reach the space where the third space 4 is to be formed. As a result, in the third space 4, aluminum ions are prevented from dissolving from the inner surface of the shell 5 and the first header member 8 into the latent heat storage material 6, and the supercooling of the latent heat storage material 6 is more reliably and stably performed.

[0032] The first header member 8 may have a second protruding portion. That is, the second protruding portion may be provided on the peripheral portion of the first header member 8. The second protruding portion may protrude from the first space 2 toward the third space 4 along the second joint portion, for example. However, the second protruding portion may protrude in the opposite direction, that is, from the third space 4 toward the first space 2 along the second joint portion. According to such a configuration, for example, the second joint portion is likely to be large, and the peripheral portion of the first header member 8 and the inner surface of the shell 5 are likely to be well joined. As a result, the heat storage device 1 is likely to have excellent durability. The tip of the second protruding portion may be in contact with the inner surface of the shell 5.

[0033] As long as the first header member 8 and the outer surface 70 of the heat transfer tube 7 can be joined, the material contained in the first bonding material 10 is not limited to a specific material. As long as the first header member 8 and the inner surface of the shell 5 can be joined, the material contained in the second bonding material is not limited to a specific material. The type of material contained in the first bonding material 10 and the type of material contained in the second bonding material may be the same or different. The first bonding material 10 and the second bonding material include, for example, a brazing material. The first bonding material 10 and the second bonding material are formed, for example, by brazing. For the first header member 8, the shell 5, and the heat transfer tube 7, for example, a clad material having a brazing material layer can be used. The brazing material includes, for example, a eutectic of aluminum and silicon. This makes it easy to bond the first header member 8 and the outer surface 70 of the heat transfer tube 7 well. In addition, it makes it easy to bond the first header member 8 and the inner surface of the shell 5 well.

[0034] The first bonding material 10 and the second bonding material may contain an auxiliary agent such as a flux. The flux contains, for example, potassium, aluminum, and fluorine. The flux contains, for example, a eutectic of KAlF4 and K3AlF6. In the first bonding material 10 and the second bonding material, the auxiliary agent such as the flux may be removed by washing.

[0035] In the heat storage device 1, the brazing material layer may not be formed in the space that is to form the third space 4. In the first header member 8, the bonding material including the brazing material layer may not be formed on the second main surface 82. This makes it easier for the first bonding material 10 and the second bonding material to be formed on the first space 2 side. In addition, the first bonding portion 84 and the second bonding portion are unlikely to be present in the third space 4. In this case, in the manufacture of the heat storage device 1, even if an auxiliary agent such as flux is supplied in the space that is to form the first space 2 to form the first bonding portion 84 and the second bonding portion, the auxiliary agent is unlikely to reach the space that is to form the third space 4. As a result, in the third space 4, aluminum ions are prevented from eluting from the inner surface of the shell 5, the outer surface 70 of the heat transfer tube 7, and the first header member 8 into the latent heat storage material 6, and the supercooling of the latent heat storage material 6 is more reliably and stably performed.

[0036] The latent heat storage material 6 is not limited to a specific latent heat storage material. The latent heat storage material 6 contains, for example, a metal salt or a metal salt hydrate as a main component. This makes it easier for the latent heat storage material 6 to have the desired supercooling stability. In this specification, the "main component" means the component that is contained in the largest amount by mass.

[0037] Examples of metal salts are the sodium, lithium, potassium, calcium, magnesium, barium, iron, and aluminum salts.

[0038] The latent heat storage material 6 may contain sodium acetate as a main component, which makes it easier for the latent heat storage material 6 to have the desired supercooling stability with greater certainty.

[0039] The main component of the latent heat storage material 6 may be a predetermined hydrate. For example, it may be a hydrate of the above-mentioned metal salts. Examples of hydrates are sodium sulfate decahydrate, sodium hydrogen sulfate monohydrate, lithium chlorate trihydrate, lithium perchlorate trihydrate, potassium fluoride dihydrate, potassium fluoride tetrahydrate, calcium chloride dihydrate, calcium chloride tetrahydrate, calcium chloride hexahydrate, lithium nitrate trihydrate, sodium sulfate decahydrate, sodium carbonate heptahydrate, sodium carbonate decahydrate, calcium bromide dihydrate, disodium hydrogen phosphate dihydrate, disodium hydrogen phosphate heptahydrate, disodium hydrogen phosphate dodecahydrate, ferric chloride tetrahydrate, ferric chloride hexahydrate, sodium thiosulfate pentahydrate, magnesium sulfate heptahydrate, lithium acetate dihydrate, sodium hydroxide monohydrate, barium hydroxide monohydrate, barium hydroxide octahydrate, sodium pyrophosphate decahydrate, trisodium phosphate hexahydrate, trisodium phosphate octahydrate, and trisodium phosphate dodecahydrate.

[0040] The latent heat storage material 6 may further contain other components such as a stabilizer and water.

[0041] As shown in FIG. 1, the heat storage device 1 further includes, for example, a second header member 9. The second header member 9 separates, for example, the second space 3 and the third space 4. FIG. 3 is an enlarged cross-sectional view of another part of the heat storage device 1 shown in FIG. 1. As shown in FIG. 3, the second header member 9 has, for example, a third main surface 91 and a fourth main surface 92. The third main surface 91 is in contact with, for example, the second space 3. The fourth main surface 92 is in contact with, for example, the third space 4. The second header member 9 is, for example, a plate-shaped member. The third main surface 91 is located on the opposite side to the fourth main surface 92 in the thickness direction of the second header member 9, for example.

[0042] As shown in FIG. 3, the heat storage device 1 includes, for example, a third bonding material 12. The third bonding material 12 is present at least in, for example, a third bonding portion 94. The third bonding portion 94 is present, for example, between the second header member 9 and the outer surface 70 of the heat transfer tube 7. The area of ​​the third bonding material 12 in contact with the second space 3 is larger than the area of ​​the third bonding material 12 in contact with the third space 4. The third bonding portion 94 bonds, for example, the second header member 9 and the outer surface 70 of the heat transfer tube 7. The third bonding material 12 is away from, for example, the fourth main surface 92. The third bonding portion 94 is not formed on, for example, the fourth main surface 92.

[0043] The heat storage device 1 includes, for example, a fourth bonding material. The fourth bonding material is present at least in, for example, the fourth bonding portion. The fourth bonding portion is present, for example, between the peripheral portion of the second header member 9 and the inner surface of the shell 5. The area of ​​the fourth bonding material in contact with the second space 3 is greater than the area of ​​the fourth bonding material in contact with the third space 4. The fourth bonding portion bonds, for example, the peripheral portion of the second header member 9 to the inner surface of the shell 5. The fourth bonding material is, for example, away from the fourth main surface 92. The fourth bonding portion is, for example, not formed on the fourth main surface 92. The second header member 9 includes, for example, aluminum or an aluminum alloy as a main material. According to this configuration, for example, in the manufacture of the heat storage device 1, even if an auxiliary agent such as flux is not supplied to the space that is to form the third space 4, the third bonding portion 94 and the fourth bonding portion are easily formed by supplying an auxiliary agent such as flux to the space that is to form the second space 3. As a result, an auxiliary agent such as flux is less likely to be present in the third space 4. Therefore, in the third space 4, aluminum ions are prevented from eluting from the inner surface of the shell 5, the outer surface 70 of the heat transfer tube 7, and the second header member 9 into the latent heat storage material 6. As a result, the supercooling of the latent heat storage material 6 is more reliably stabilized. In addition, an oxide film is typically formed on the second header member 9. In the joining of each member, the oxide film is removed from the portion where the auxiliary agent such as flux contacts. According to the above-mentioned configuration, the auxiliary agent such as flux does not need to be used in the space that is to form the third space 4. As a result, since the oxide film formed in the space that is to form the third space 4 is difficult to remove, the elution of aluminum ions can be prevented even if the space that is to form the third space 4 is not subjected to treatment such as anodizing and boehmite treatment. This can reduce costs in the manufacture of the heat storage device 1.

[0044] As shown in FIG. 3, the third joint 94 has a thickness that decreases from the second space 3 toward the third space 4, for example. The third joint 94 includes, for example, a portion that fills the space between the second header member 9 and the outer surface 70 of the heat transfer tube 7. The thickness of the third joint 94 means the distance between the surface where the second header member 9 and the third joint 94 are joined and the surface where the third joint 94 and the outer surface 70 of the heat transfer tube 7 are joined. The thickness of the third joint 94 is measured, for example, along a direction perpendicular to the longitudinal direction of the heat transfer tube 7. With this configuration, for example, in the manufacture of the heat storage device 1, it is easy to arrange the members so that the space where the third joint 94 is to be formed has a thickness that decreases from the second space 3 toward the third space 4. In this case, even if an auxiliary agent such as flux is supplied in the space where the second space 3 is to be formed in the manufacture of the heat storage device 1 to form the third joint 94, the auxiliary agent is unlikely to reach the space where the third space 4 is to be formed. As a result, in the third space 4, elution of aluminum ions from the outer surface 70 of the heat transfer tube 7 and the second header member 9 into the latent heat storage material 6 is suppressed, and supercooling of the latent heat storage material 6 is more reliably and stably achieved.

[0045] As shown in FIG. 3, the second header member 9 may have a third protruding portion 22. The third protruding portion 22 protrudes, for example, from the second space 3 toward the third space 4 along the third joint portion 94. However, the third protruding portion 22 may protrude in the opposite direction to that in FIG. 4, that is, from the third space 4 toward the second space 3 along the third joint portion 94. According to such a configuration, for example, the third joint portion 94 is likely to be large, and the second header member 9 and the outer surface 70 of the heat transfer tube 7 are likely to be joined well. As a result, the heat storage device 1 is likely to have excellent durability. The tip of the third protruding portion 22 may be in contact with the outer surface 70 of the heat transfer tube 7. The third protruding portion 22 in the second header member 9 may be formed by burring.

[0046] As shown in FIG. 3, the outer surface 70 of the heat transfer tube 7 has, for example, a second tapered portion 72. The second tapered portion 72 is formed, for example, from the third space 4 toward the second space 3 in the longitudinal direction of the heat transfer tube 7. The third bonding material 12 is formed, for example, around the second tapered portion 72. According to this configuration, for example, in the manufacture of the heat storage device 1, each member is easily arranged so that the space to form the third bonding portion 94 has a thickness that decreases from the second space 3 toward the third space 4. In this case, even if an auxiliary agent such as flux is supplied in the space to form the second space 3 to form the third bonding portion 94 in the manufacture of the heat storage device 1, the auxiliary agent is unlikely to reach the space to form the third space 4. As a result, the elution of aluminum ions from the outer surface 70 of the heat transfer tube 7 and the second header member 9 into the latent heat storage material 6 is suppressed, and the supercooling of the latent heat storage material 6 is more reliably and stably achieved. In addition, according to this configuration, the heat transfer tube 7 is easily inserted into the second header member 9, so that the heat storage device 1 can be easily manufactured.

[0047] The fourth joint has a thickness that decreases from the second space 3 toward the third space 4. The fourth joint includes, for example, a portion that fills the gap between the second header member 9 and the inner surface of the shell 5. The thickness of the fourth joint means the distance between the surface where the peripheral portion of the second header member 9 and the fourth joint are joined and the surface where the fourth joint and the inner surface of the shell 5 are joined. The thickness of the fourth joint is measured, for example, along a direction perpendicular to the inner surface of the shell 5. According to such a configuration, for example, in the manufacture of the heat storage device 1, it is easy to arrange each member so that the space where the fourth joint is to be formed has a thickness that decreases from the second space 3 toward the third space 4. In this case, in the manufacture of the heat storage device 1, even if an auxiliary agent such as flux is supplied in the space where the second space 3 is to be formed to form the fourth joint, the auxiliary agent is unlikely to reach the space where the third space 4 is to be formed. As a result, in the third space 4, aluminum ions are prevented from dissolving from the inner surface of the shell 5 and the second header member 9 into the latent heat storage material 6, and the supercooling of the latent heat storage material 6 is more reliably and stably performed.

[0048] The second header member 9 may have a fourth protruding portion. That is, the fourth protruding portion may be provided on the peripheral portion of the second header member 9. The fourth protruding portion may protrude from the second space 3 toward the third space 4 along the fourth joint portion, for example. However, the fourth protruding portion may protrude in the opposite direction, that is, from the third space 4 toward the second space 3 along the fourth joint portion. According to such a configuration, for example, the fourth joint portion is likely to be large, and the peripheral portion of the second header member 9 and the inner surface of the shell 5 are likely to be well joined. As a result, the heat storage device 1 is likely to have excellent durability. The tip of the fourth protruding portion may be in contact with the inner surface of the shell 5.

[0049] As long as the second header member 9 and the outer surface 70 of the heat transfer tube 7 can be joined, the material contained in the third bonding material 12 is not limited to a specific material. As long as the second header member 9 and the inner surface of the shell 5 can be joined, the material contained in the fourth bonding material is not limited to a specific material. The type of material contained in the third bonding material 12 and the type of material contained in the fourth bonding material may be the same or different. The third bonding material 12 and the fourth bonding material include, for example, a brazing material. The third bonding material 12 and the fourth bonding material are formed, for example, by brazing. For the second header member 9, for example, a clad material having a brazing material layer can be used. For the brazing material, for example, the brazing material described above can be used. This makes it easier to bond the second header member 9 and the outer surface 70 of the heat transfer tube 7 well. In addition, the second header member 9 and the inner surface of the shell 5 can be easily bonded well.

[0050] In the second header member 9, the bonding material including the brazing material layer may not be formed on the fourth main surface 92. This makes it easier for the third bonding portion 94 and the fourth bonding portion to be formed on the second space 3 side. In addition, the third bonding portion 94 and the fourth bonding portion are less likely to be present in the third space 4. In this case, in the manufacture of the heat storage device 1, even if an auxiliary agent such as flux is supplied in the space that is to form the second space 3 to form the third bonding portion 94 and the fourth bonding portion, the auxiliary agent is less likely to reach the space that is to form the third space 4. As a result, in the third space 4, aluminum ions are prevented from eluting from the inner surface of the shell 5, the outer surface 70 of the heat transfer tube 7, and the second header member 9 into the latent heat storage material 6, and the supercooling of the latent heat storage material 6 is more reliably and stably performed.

[0051] The third bonding material 12 and the fourth bonding material may contain, for example, the above-mentioned flux. In the third bonding material 12 and the fourth bonding material, auxiliary agents such as flux may be removed by washing.

[0052] The heat storage device 1 may further include, for example, a supercooling release device (not shown). The supercooling release device can release the supercooling of the latent heat storage material 6 at a desired timing. The configuration of the supercooling release device is not limited to a specific configuration as long as it can release the supercooling of the latent heat storage material 6. The supercooling release device generates, for example, a physical action for releasing the supercooling of the latent heat storage material 6. The physical action may be the movement or vibration of a specified object, or may be an electrical action.

[0053] An example of a method for manufacturing the heat storage device 1 will be described.

[0054] FIG. 4 is a cross-sectional view showing a part of the manufacturing method of the heat storage device 1. First, a first header member 8 is arranged in the internal space of the shell 5 to divide the internal space of the shell 5. The first header member 8 is, for example, a plate-shaped member. The first header member 8 has a through hole 80. One end of the heat transfer tube 7 in the longitudinal direction is inserted into the through hole 80 of the first header member 8. As shown in FIG. 4, the heat transfer tube 7 is inserted, for example, from a space that is to form the third space 4 into the through hole 80 of the first header member 8. As a result, for example, one end of the heat transfer tube 7 in the longitudinal direction is protruded from the through hole 80 from the first header member 8. In this way, the first space 2 in which one end of the heat transfer tube 7 in the longitudinal direction exists is formed in the internal space of the shell 5. The first header member 8 and the heat transfer tube 7 contain aluminum or an aluminum alloy as a main material. The shell 5 contains, for example, aluminum or an aluminum alloy as a main material.

[0055] FIG. 5 is a cross-sectional view showing another part of the manufacturing method of the heat storage device 1. As shown in FIG. 5, the first header member 8 has, for example, a brazing material layer 30. The brazing material layer 30 is formed, for example, on the first main surface 81 and the inner circumferential surface 83 of the first header member 8. The inner circumferential surface 83 includes, for example, a surface adjacent to the first main surface 81. The brazing material layer 30 is not formed, for example, on the second main surface 82. The flux 33 is attached near the first contact portion 31. The first contact portion 31 is formed, for example, between the first header member 8 and the outer surface 70 of the heat transfer tube 7. The first contact portion 31 includes, for example, a portion where the tip of the first header member 8 and the outer surface 70 of the heat transfer tube 7 contact each other. The first contact portion 31 is included, for example, in the first space 2. The vicinity of the first contact portion 31 is, for example, a first intended joining portion. The first intended joining portion exists between the first header member 8 and the outer surface 70 of the heat transfer tube 7. In the first joint, the flux 33 is attached, for example, between the brazing material layer 30 and the outer surface 70 of the heat transfer tube 7. With the flux 33 attached to the first joint, the periphery of the first joint is heated and cooled. This causes the components contained in the flux 33 to flow, and the oxide film is removed from the first header member 8 and the outer surface 70 of the heat transfer tube 7. Thereafter, the brazing material contained in the brazing material layer 30 melts, and the first header member 8 and the outer surface 70 of the heat transfer tube 7 are joined together. This forms a first joint 84. Thereafter, the latent heat storage material 6 is accommodated in the third space 4, and the heat storage device 1 is obtained.

[0056] The brazing material layer 30 may be formed on the first main surface 81 and the peripheral portion of the first header member 8. For example, the flux 33 is attached near the second contact portion. The second contact portion is formed, for example, between the peripheral portion of the first header member 8 and the inner surface of the shell 5. The second contact portion includes, for example, a portion where the tip of the first header member 8 and the inner surface of the shell 5 contact each other. The second contact portion is included, for example, in the first space 2. The vicinity of the second contact portion is, for example, a second planned joining portion. The second planned joining portion exists, for example, between the first header member 8 and the inner surface of the shell 5. In the second planned joining portion, the flux 33 is attached, for example, between the brazing material layer 30 and the inner surface of the shell 5. With the flux 33 attached to the second planned joining portion, the periphery of the second planned joining portion is heated and cooled. This causes the components contained in the flux 33 to flow, and the oxide film is removed from the first header member 8 and the inner surface of the shell 5. Thereafter, the brazing material contained in the brazing material layer 30 melts to bond the first header member 8 to the inner surface of the shell 5. This forms a second bonded portion.

[0057] According to such a manufacturing method, the flux 33 is attached in the first space 2 where one end of the heat transfer tube 7 is present. Therefore, by accommodating the latent heat storage material 6 in a space where one end of the heat transfer tube 7 is not present, the flux 33 is unlikely to be present in the space where the latent heat storage material 6 is accommodated. Therefore, in the space where the latent heat storage material 6 is accommodated, aluminum ions are prevented from eluting from the inner surface of the shell 5, the outer surface 70 of the heat transfer tube 7, and the first header member 8 into the latent heat storage material 6. As a result, it is possible to manufacture a heat storage device 1 in which the supercooling of the latent heat storage material 6 is likely to be stable.

[0058] FIG. 6 is a cross-sectional view showing yet another part of the manufacturing method of the heat storage device 1. As shown in FIG. 6, for example, a second header member 9 is arranged in the internal space of the shell 5 to divide the internal space of the shell 5. The second header member 9 is, for example, a plate-shaped member. The second header member 9 has a through hole 90. The other end of the heat transfer tube 7 in the longitudinal direction is inserted into the through hole 90 of the second header member 9. As shown in FIG. 6, in the manufacturing method of the heat storage device 1, the heat transfer tube 7 is, for example, inserted into the through hole 90 of the second header member 9 from a space that is to form the third space 4. As a result, for example, the other end of the heat transfer tube 7 in the longitudinal direction is protruded from the through hole 90 from the second header member 9. In this way, the second space 3 in which the other end of the heat transfer tube 7 in the longitudinal direction exists is formed in the internal space of the shell 5. The second header member 9 contains, for example, aluminum or an aluminum alloy as a main material.

[0059] FIG. 7 is a cross-sectional view showing yet another part of the manufacturing method of the heat storage device 1. As shown in FIG. 7, the second header member 9 has, for example, a brazing material layer 40. The brazing material layer 40 is formed, for example, on the third main surface 91 and the inner circumferential surface 93 of the second header member 9. The inner circumferential surface 93 includes, for example, a surface adjacent to the third main surface 91. The brazing material layer 40 is not formed, for example, on the fourth main surface 92. The flux 43 is attached near the third contact portion 41. The third contact portion 41 is formed, for example, between the second header member 9 and the outer surface 70 of the heat transfer tube 7. The third contact portion 41 includes, for example, a portion where the tip of the second header member 9 and the outer surface 70 of the heat transfer tube 7 contact each other. The third contact portion 41 is included, for example, in the second space 3. The vicinity of the third contact portion 41 is, for example, a third intended joining portion. The third intended joining portion exists, for example, between the second header member 9 and the outer surface 70 of the heat transfer tube 7. In the third joint, the flux 43 is attached, for example, between the brazing material layer 40 and the outer surface 70 of the heat transfer tube 7. With the flux 43 attached to the third joint, the periphery of the third joint is heated and cooled. This causes the components contained in the flux 43 to flow, and the oxide film is removed from the second header member 9 and the outer surface 70 of the heat transfer tube 7. Thereafter, the brazing material contained in the brazing material layer 40 melts, and the second header member 9 and the outer surface 70 of the heat transfer tube 7 are joined together. This forms a third joint 94.

[0060] The brazing layer 40 may be formed on the third main surface 91 and the peripheral portion of the second header member 9. For example, the flux 43 is attached near the fourth contact portion. The fourth contact portion is formed, for example, between the peripheral portion of the second header member 9 and the inner surface of the shell 5. The fourth contact portion includes, for example, a portion where the tip of the second header member 9 and the inner surface of the shell 5 contact each other. The fourth contact portion is included, for example, in the second space 3. The vicinity of the fourth contact portion is, for example, a fourth planned joining portion. The fourth planned joining portion exists, for example, between the second header member 9 and the inner surface of the shell 5. In the fourth planned joining portion, the flux 43 is attached, for example, between the brazing layer 40 and the inner surface of the shell 5. With the flux 43 attached to the fourth planned joining portion, the periphery of the fourth planned joining portion is heated and cooled. As a result, the components contained in the flux 43 flow, and the oxide film is removed from the inner surfaces of the second header member 9 and the shell 5. Thereafter, the brazing material contained in the brazing material layer 40 melts, and the second header member 9 and the inner surface of the shell 5 are joined. This forms a fourth joint. According to this manufacturing method, the flux 43 is attached to the second space 3 where the other end of the heat transfer tube 7 is present. Therefore, by accommodating the latent heat storage material 6 in a space where the other end of the heat transfer tube 7 is not present, the flux 43 is unlikely to be present in the space where the latent heat storage material 6 is accommodated. Therefore, in the space where the latent heat storage material 6 is accommodated, aluminum ions are prevented from eluting from the inner surface of the shell 5, the outer surface 70 of the heat transfer tube 7, and the second header member 9 into the latent heat storage material 6. As a result, the heat storage device 1 in which the supercooling of the latent heat storage material 6 is likely to be stable can be manufactured more reliably. [Explanation of symbols]

[0061] 1 Heat storage device 2 First space 3 Second space 4 Third space 5. Shell 6 Latent heat storage material 7 Heat transfer tube 8 First header member 9 Second header member 10 First bonding material 12 Third bonding material 14 Supply inlet 15 Outlet 20 First protrusion 22 Third protrusion 30 Brazing layer 31 First contact part 33 Flux 40 Brazing layer 41 Third contact part 43 Flux 70 Outer surface of heat transfer tube 71 First taper section 72 Second taper section 80 Through Hole 81 First principal surface 82 Second principal surface 83 Inner peripheral surface 84 First joint 90 Through hole 91 Third principal surface 92 Fourth principal plane 93 Inner peripheral surface 94 Third joint

Claims

1. a shell having an internal space including a first space, a second space separated from the first space, and a third space formed between the first space and the second space, the first space, the third space, and the second space being arranged in this order along a reference plane; A latent heat storage material accommodated in the third space; A heat transfer tube including aluminum or an aluminum alloy as a main material, the heat transfer tube having an outer surface in contact with the third space and communicating between the first space and the second space; A first header member that divides the first space and the third space and is mainly made of aluminum or an aluminum alloy; a first bonding material present at least in a first bonding portion between the first header member and the outer surface of the heat transfer tube, An area of ​​the first bonding material in contact with the first space is larger than an area of ​​the first bonding material in contact with the third space. Heat storage device.

2. The heat storage device according to claim 1 , wherein the first joint portion has a thickness that decreases from the first space toward the third space in a portion that fills the space between the first header member and the outer surface of the heat transfer tube.

3. 3. The heat storage device according to claim 1, wherein the outer surface of the heat transfer tube has a first tapered portion formed from the third space toward the first space, and the first joint portion is formed around the first tapered portion.

4. The heat storage device according to claim 1 , wherein the first header member has a first protruding portion protruding from the first space toward the third space or from the third space toward the first space along the first joint.

5. The heat storage device according to claim 1 , wherein the first bonding material includes a brazing material.

6. a first header member including aluminum or an aluminum alloy as a main material and having a through hole disposed in an internal space of the shell to divide the internal space; Inserting one end of a heat transfer tube including aluminum or an aluminum alloy as a main material into the through hole of the first header member; a first space in which the one end of the internal space exists, in which a flux is applied to a joint portion between the first header member and the heat transfer tube, while heating and cooling a periphery of the joint portion, thereby joining the first header member and the heat transfer tube by brazing; and accommodating a latent heat storage material in a space separated from the first space by the first header member in the internal space. A method for manufacturing a heat storage device.

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