JP2015048393A - Heat reservoir - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat reservoir having excellent durability while retaining the storage of heat.SOLUTION: A heat reservoir 10 in this invention comprises: heat reserve material 11 having heat reserve properties; a heat reserve container 12 storing the heat reserve material 11 at the inside; and a buffer member 13 provided between the heat reserve material 11 and the heat reserve container 12 and buffering stress applied to the heat reserve container 12 by the heat reserve material 11.

Description

  The present invention relates to a heat storage body, and particularly to a heat storage body having excellent durability while maintaining a heat storage amount.

  In recent years, heat storage materials that can store and release heat have attracted attention as clean and ecological energy sources using solar energy and factory waste heat. As a heat storage material, a latent heat storage material (hereinafter also referred to as PCM) that can store heat using latent heat accompanying phase change is known, and a material that stores this latent heat storage material in a heat storage container is used as a heat storage body. That has been done. By storing the heat storage body with warm energy or cold heat from solar energy or factory waste heat, storing it in a tank body or the like and releasing the heat in the tank body, it is possible to effectively use the cold heat or heat.

  As a heat storage body that stores heat using such latent heat, for example, a capsule-shaped heat storage body having a latent heat storage material therein has been proposed (for example, see Patent Document 1).

  Patent Document 1 proposes a heat storage body including an internal heat storage body made of a material having heat storage properties and an outer shell made of ceramics. This heat storage body uses the sensible heat of the internal heat storage body before melting, the latent heat of the internal heat storage body, the sensible heat of the internal heat storage body in the molten state, and the sensible heat of the outer shell, and has excellent heat storage properties (high heat storage Amount).

JP 2012-238912 A

  The size of the outer shell has a diameter of, for example, about 5 to 50 mm so that the heat storage body as described above can efficiently cool the internal heat storage body that has been stored and becomes high temperature and can efficiently dissipate heat from the internal heat storage body. Since it is a small sphere, the heat storage amount of the heat storage body is small and it is easy to cool, so the heat retention amount is low.

  By the way, the PCM, which is an internal heat storage body, stores heat using the phase change of melting and solidification, so when the volume of the PCM changes and contacts the outer shell during the phase change process, Reacts to cause erosion at the interface, and an erosion layer is formed in the outer shell. Since this erosion layer joins the PCM and the outer shell, if the PCM in the erosion layer expands due to a volume change in the process of phase change due to the difference in thermal expansion between the outer shell and the PCM, a crack or the like is generated in the outer shell. There is a possibility of damaging the outer shell. In particular, even when the heat storage body is enlarged in order to increase the amount of heat stored in the heat storage body, the thickness of the outer shell is almost constant regardless of the size of the outer shell. The thickness becomes relatively small, and the PCM in the erosion layer formed on the inner wall of the outer shell changes in volume and expands, making it easier to crack the outer shell and possibly damaging the outer shell. Becomes higher.

  In the future, there is a need for a heat storage body that can be used stably without damaging the outer shell even when the heat storage body is enlarged in order to further effectively use the heat storage body.

  This invention is made | formed in view of the problem mentioned above, and provides the thermal storage body which has the outstanding durability, maintaining a heat storage amount.

  In order to solve the above-described problems, the present invention is provided between a heat storage material having heat storage properties, a heat storage container that accommodates the heat storage material therein, the heat storage material and the heat storage container, and the heat storage material is And a buffer member that relieves stress applied to the heat storage container.

  In the present invention, the buffer member preferably includes at least a metal oxide selected from the group consisting of Al, Ti, Si, Na, K, and Zr, W, Mo, or boron nitride.

  In this invention, it is preferable that the said buffer member contains 10 mass% or more of boron nitride.

  In the present invention, the heat storage material preferably includes at least one selected from the group consisting of Al, Mg, Si, Cu, Zn, and Sn, and an alloy containing any one of these metals. .

  In the present invention, the heat storage material comprises at least an alkali metal or alkaline earth metal carbonate, hydroxide, or chloride selected from the group consisting of K, Li, Na, Ca, and Mg. Is preferred.

  In the present invention, the heat storage container preferably comprises a ceramic selected from the group consisting of aluminum oxide, magnesium oxide, aluminum titanate, aluminum nitride, silicon nitride, silicon dioxide, silicon carbide, and boron carbide.

  In this invention, it is preferable that the said thermal storage container is cylindrical shape and the diameter in the cross-sectional shape of a cylinder is 50 mm or more.

  In this invention, it is preferable that the said thermal storage container is spherical and the diameter of the said thermal storage container is 50 mm or more.

  Since the heat storage body of the present invention includes a buffer member between the heat storage material and the heat storage container, the buffer member relieves the stress applied to the heat storage container by the heat storage material and suppresses damage to the heat storage container. Therefore, it is possible to have excellent durability while maintaining the heat storage amount. Thereby, the heat storage body of the present invention increases the amount of heat storage while maintaining high durability even when the heat storage container is enlarged, for example, the diameter becomes 50 mm or more and the filling amount of the heat storage material in the heat storage container increases. Can be made.

FIG. 1 is a perspective view of a heat storage body according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. FIG. 3 is a cross-sectional view schematically showing another example of the configuration of the heat storage body. FIG. 4 is a cross-sectional view schematically showing another example of the configuration of the heat storage body. FIG. 5 is a perspective view schematically showing another example of the configuration of the heat storage body. FIG. 6 is a cross-sectional view schematically illustrating another example of the configuration of the heat storage body. FIG. 7 is a cross-sectional view schematically showing another example of the configuration of the heat storage body. Drawing 8 is an explanatory view of one process of a manufacturing method of a thermal storage object. Drawing 9 is an explanatory view of other processes of a manufacturing method of a thermal storage object. Drawing 10 is an explanatory view of other processes of a manufacturing method of a thermal storage object. Drawing 11 is an explanatory view of other processes of a manufacturing method of a thermal storage object.

  DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings. In addition, this invention is not limited by the following embodiment. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the constituent elements disclosed in the following embodiments can be appropriately combined. In addition, for convenience of explanation of the internal structure of the heat storage body, in the example shown below, the explanation will be made with a diagram in which the surface on which the heat storage body is installed is placed below, but the present invention is not necessarily used in this arrangement. It is not done.

[Embodiment]
<Heat storage body>
Embodiment of the thermal storage body which concerns on this embodiment is described. FIG. 1 is a perspective view of a heat storage body according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. As shown in FIGS. 1 and 2, the heat storage body 10 </ b> A includes a heat storage material 11, a heat storage container (outer shell) 12, and a buffer member 13. Moreover, in this embodiment, as shown in FIG. 3, as for the thermal storage body 10B, the buffer member 13 may consist of a some layer (In FIG. 2, buffer member 13A, two layers of 13B).

[Heat storage material]
The heat storage material 11 has a heat storage property. The heat storage material 11 is accommodated in the heat storage container 12 and covered with a buffer member 13.

  The heat storage material 11 is not particularly limited as long as it is made of a substance having heat storage properties, but at least one selected from the group consisting of metals, alloys, and salts that melt and store or release heat by phase change. Preferably it comprises. The heat storage is performed using sensible heat generated when the heat storage material 11 changes from a solid phase to a liquid phase, latent heat of the heat storage material 11, and sensible heat of the molten heat storage material 11. Heat release is performed using sensible heat generated when the heat storage material 11 changes from a liquid phase to a solid phase, latent heat of the heat storage material 11, and sensible heat of the molten heat storage material 11.

  Examples of the metal that stores heat or releases heat by melting include at least one metal selected from the group consisting of Al, Mg, Si, Cu, Zn, and Sn. Examples of the alloy that melts and stores or dissipates heat include alloys containing any one of the above metals. When an alloy is used as the heat storage material 11, an alloy of Al and Si (Al—Si alloy) is preferably used. The Al—Si alloy has a sufficient melting point and heat storage amount as a heat storage material, and has a lower volume expansion at the time of melting than other alloys, etc., so that a gap generated between the heat storage material 11 and the buffer member 13 is reduced. Or this gap can be eliminated. The ratio of Al to Si in the Al—Si alloy is preferably 5:95 to 30:70, more preferably 10:90 to 20:80, and most preferably 12:88.

Examples of the salt that melts and stores or dissipates heat include carbonates, hydroxides, or chlorides of alkali metals or alkaline earth metals selected from the group consisting of K, Li, Na, Ca, and Mg. Can do. The alkali metal or alkaline earth metal carbonate compound, hydroxide, or chloride may be used alone or in combination of two or more. The alkali metal or alkaline earth metal carbonate, hydroxide, or chloride is preferably sodium hydroxide (NaOH), sodium chloride (NaCl), potassium carbonate (K ₂ CO ₃ ) -lithium carbonate (Li ₂ CO ₃₎ - lithium hydroxide (LiOH), magnesium chloride (MgCl ₂₎ - sodium chloride (NaCl), lithium hydride (LiH) - sodium chloride (NaCl), potassium chloride (KCl) - lithium fluoride (LIF- NaF) and the like.

  As the heat storage material 11, one of these metals, alloys, or salts may be used alone, or two or more may be used in combination. It is preferable that the heat storage material 11 is appropriately selected in consideration of the use conditions of the heat storage body 10A, the melting point, the boiling point, and the like of the heat storage material 11.

  The heat storage material 11 is configured using the metal, alloy, or salt as described above, so that the sensible heat of the heat storage material 11 before melting, the latent heat of the heat storage material 11, and the sensible heat of the heat storage material 11 in a molten state. Can be used to store heat.

  The melting point of the heat storage material 11 is preferably 400 to 900 ° C. When the heat storage material 11 undergoes a phase change within the above temperature range, the sensible heat of the heat storage material 11 before melting, the latent heat of the heat storage material 11 and the sensible heat of the heat storage material 11 in the molten state in the temperature range where the heat storage body 10A is stored. Heat is stored in the heat storage body 10A by using heat.

  The shape of the heat storage material 11 is not particularly limited as long as it has a size that can be accommodated in the heat storage container 12. Since the heat storage material 11 is formed by using a metal, alloy, or salt that melts and stores or dissipates heat by phase change, the heat storage material 11 is changed from a solid phase to a liquid phase or liquid by repeating heat storage and heat dissipation. Phase changes from phase to solid phase. Therefore, the shape of the heat storage material 11 is appropriately changed according to the shape of the space inside the heat storage container 12.

[Heat storage container]
The heat storage container 12 accommodates the heat storage material 11 therein. The heat storage container 12 is made of ceramics. The type of ceramic constituting the heat storage container 12 is not particularly limited, but aluminum oxide (Al ₂ O ₃ ), magnesium oxide (MgO), aluminum titanate (Al ₂ TiO ₅ ), aluminum nitride (AlN), At least one selected from the group consisting of silicon dioxide (SiO ₂ ), silicon nitride (Si ₃ N ₄ ), silicon carbide (SiC), and boron carbide (B ₄ C), or a composite containing at least one selected from the above group Can be used. As a composite, sialon (SiAlON) composed of Al ₂ O ₃ , Si ₃ N ₄ and SiO ₂ , mullite (Al ₆ O ₁₃ Si ₂ ) composed of Al ₂ O ₃ and SiO ₂ , MgO, Al ₂ O ₃ and Cordierite (2MgO · 2Al ₂ O ₃ · 5SiO ₂ ) made of SiO ₂ can be used. In the present embodiment, Al ₂ O ₃ , Al ₂ TiO ₅ , AlN, Si ₃ N ₄ , SiC, and SiAlON can be suitably used. In particular, AlN can be used more suitably from the viewpoints of low thermal conductivity, high infrared absorption, and low reactivity with the heat storage material 11. By forming the heat storage container 12 with the material as described above, it is possible to obtain a stable heat storage body 10A having excellent heat resistance and high strength. Moreover, the sensible heat of the heat storage container 12 can also be used effectively for heat storage.

  In the present embodiment, the heat storage container 12 has a cylindrical shape having a space inside, but the shape of the heat storage container 12 is not particularly limited, and various shapes can be used as long as the heat storage material 11 can be accommodated therein. It can be a shape. In addition to the cylindrical shape, the shape of the heat storage container 12 may be, for example, as shown in FIG. 4, the shape of the heat storage container 12 of the heat storage body 10C may be spherical, or as shown in FIG. The cross-sectional shape of the heat storage container 12 may be a polygon such as a quadrangle. In addition, from the viewpoint of high heat storage efficiency and easy handling, the shape of the heat storage container 12 is preferably a spherical shape as shown in FIG. 4.

  Moreover, as shown in FIG. 6, the heat storage container 12 may be formed of a pair of first heat storage container 12a and second heat storage container 12b divided into two. The 1st heat storage container 12a and the 2nd heat storage container 12b are joined by each joint surface 15a, 15b. The positions of the joint surfaces 15a and 15b are not limited to this, and may be other positions.

  As a joining method of the joining surfaces 15a and 15b, the heat storage container 12 is heated to a temperature at which the first heat storage container 12a and the second heat storage container 12b react with each other, and the first heat storage container 12a and the second heat storage container 12b are joined. It is preferable to solidify the vicinity of the surfaces 15a and 15b to join the joining surfaces 15a and 15b. When the first heat storage container 12a and the second heat storage container 12b are heated to a temperature at which the eutectic reaction occurs, the crystals become dense, so that the bonding surfaces 15a and 15b can be bonded firmly.

  Further, the bonding surfaces 15a and 15b may be sealed using a heat-resistant adhesive. As the adhesive, for example, an adhesive containing Ba, Si, and Mg can be used. Thereby, even if an impact is applied to the heat storage body 10A from the outside due to contact with the other heat storage body 10A or the like, the joining surfaces 15a and 15b are prevented from coming off, and the molten heat storage material 11 leaks to the outside of the heat storage container 12. This can be suppressed.

  The thickness of the heat storage container 12 is appropriately determined according to the strength and thermal conductivity of the heat storage container 12 and is not particularly limited, but from the viewpoint of securing the strength of the heat storage container 12, the thickness of the heat storage container 12 is 0.5 to 10 mm is preferable, and 2 to 4 mm is more preferable. When the thickness of the heat storage container 12 is less than 0.5 mm, the strength of the heat storage container 12 is reduced and the molten heat storage material 11 may leak from the heat storage container 12 to the outside. When the thickness of the shell of the heat storage container exceeds 10 mm, the volume of the heat storage container 12 increases. Therefore, when compared with the heat storage body 10A of the same size, the content of the heat storage material 11 inside the heat storage container 12 is relatively Therefore, the heat storage performance of the heat storage body 10A is reduced.

  The size of the heat storage container 12 is not particularly limited, and when the heat storage container 12 is cylindrical as shown in FIGS. 1 and 2, the diameter T1 in the cross-sectional shape of the heat storage container 12 is conventionally used. Like the heat storage container, it may be 5 mm or more, but can be suitably used even in the case of 50 mm or more. The diameter T1 of the cross-sectional shape of the heat storage container 12 is more preferably 50 to 200 mm, and still more preferably 100 to 150 mm. The heat storage body 10A can maintain the durability of the heat storage container 12 even when the size of the heat storage container 12 is set within the above range, the volume of the heat storage material 11 contained is increased, and the heat storage amount is increased.

  When the heat storage container 12 is spherical as shown in FIG. 4, the diameter T2 in the cross section passing through the center of the heat storage container 12 may be 5 mm or more as in the case where the heat storage container 12 is cylindrical, or may be 50 mm or more. It can be used suitably, More preferably, it is 50-200 mm, More preferably, it is 100-150 mm.

  In addition, although the joining surfaces 15a and 15b of the 1st heat storage container 12a and the 2nd heat storage container 12b are made into the flat plane, it is not limited to this, As shown in FIG. Fitting portions 16a and 16b that are fitted to the divided surfaces of the first heat storage container 12a and the second heat storage container 12b are provided, and after the heat storage material 11 is filled in the pair of first heat storage container 12a and second heat storage container 12b, The fitting portions 16a and 16b may be fitted to each other. By setting the heat storage container 12 to such a configuration, the heat storage body 10 including the heat storage material 11 can be easily manufactured.

[Buffer member]
The buffer member 13 is provided between the heat storage material 11 and the heat storage container 12. The buffer member 13 preferably includes at least a metal oxide selected from the group consisting of Al, Ti, Si, Na, K, and Zr, W, Mo, or boron nitride (BN). As the buffer member 13, and more preferably, _Al 2 _{O 3,} titanium oxide _{(TiO 2),} SiO 2, sodium oxide _(Na 2 O), and composites of potassium oxide _(K 2 _O), Al _{2 O} 3, It is preferable to use a composite of TiO ₂ , SiO ₂ and zirconia (ZrO ₂ ), or BN. When the buffer member 13 is formed to contain BN, the concentration of BN in the raw material containing BN is preferably 10% by mass or more.

  The buffer member 13 is provided between the heat storage material 11 and the heat storage container 12, and relieves stress applied to the heat storage container 12 by the heat storage material 11. Therefore, the stress acting on the interface between the heat storage material 11 and the heat storage container 12 can be suppressed by the difference in thermal expansion coefficient between the heat storage material 11 and the heat storage container 12. Thereby, it can control that damage to heat storage container 12 arises. Further, when the heat storage container 12 is enlarged and the filling amount of the heat storage material 11 in the heat storage container 12 is increased, the heat storage amount can be increased. However, the difference in thermal expansion coefficient between the heat storage material 11 and the heat storage container 12 is increased. Since it becomes large, the stress which acts on the interface of the thermal storage material 11 and the thermal storage container 12 will also become large, and the possibility that the thermal storage container 12 will be cracked etc. and the thermal storage container 12 will be damaged becomes high. Even when the buffer member 13 is provided between the heat storage material 11 and the heat storage container 12 and the amount of the heat storage material 11 in the heat storage container 12 is increased by relaxing the stress applied to the heat storage container 12 by the heat storage material 11. The heat storage body 10A can increase the heat storage amount while maintaining high durability.

  Although the thickness of the buffer member 13 is not specifically limited, From the viewpoint of ensuring the content of the heat storage material 11 in the heat storage container 12, the thickness of the buffer member 13 is 0.5 to 4 mm. Is preferably about 2 mm. When the thickness of the buffer member 13 is less than 0.5 mm, the buffer member 13 may not be able to sufficiently relax the stress applied to the heat storage container 12 by the heat storage material 11. When the thickness of the buffer member 13 exceeds 4 m, the content of the heat storage material 11 in the heat storage container 12 is decreased, so that the heat storage performance of the heat storage body 10A is deteriorated.

<Heat storage method of heat storage body>
Next, a heat storage method of the heat storage body 10A will be described. When the heat storage body 10A is heated, the sensible heat and latent heat of the heat storage material 11 before melting, the sensible heat of the heat storage material 11 in a molten state, and the sensible heat of the heat storage container 12 are stored in the heat storage material 11.

<Manufacturing method of heat storage body>
Next, an example of a manufacturing method of the heat storage body 10A will be described. First, a forming raw material (ceramic raw material) for forming the heat storage container 12 is prepared. For example, a binder or the like is added to ceramic powder and kneaded to prepare a forming raw material for forming a heat storage container. As the binder, for example, acrylic resin or wax can be used. Next, using this forming raw material, as shown in FIG. 8, a cylindrical shaped body 16 corresponding to the shape of the heat storage container 12 is produced. Although there is no restriction | limiting in particular about a shaping | molding method, For example, it can form using well-known shaping | molding methods, such as injection molding, extrusion molding, extrusion blow molding, injection blow molding, stretch blow molding, or gas assist injection molding. Next, as shown in FIG. 9, the molded body 16 is divided into a pair of first molded body 16a and second molded body 16b. And the obtained 1st molded object 16a and the 2nd molded object 16b are baked above the sintering temperature of a shaping | molding raw material, and the thermal storage container 12 (refer FIG. 1 etc.) which consists of ceramics is formed. In the present embodiment, the heat storage container 12 is manufactured by forming it into an arbitrary shape using a ceramic raw material. However, the present invention is not limited to this. For example, the heat storage container 12 may be a ready-made product. Good.

  Next, as shown in FIG. 10, the material of the buffer member 13 is applied to the inner wall of the heat storage container 12 and dried to form the buffer member 13 inside the first heat storage container 12a and the second heat storage container 12b. In the present embodiment, the raw material of the buffer member 13 is applied to the inner wall of the heat storage container 12, but the present invention is not limited to this. For example, the inner shape of the heat storage container 12 is already formed. You may use the buffer member 13 shape | molded together.

  Next, as shown in FIG. 11, the powdery raw material 17 constituting the heat storage material is filled in the first heat storage container 12 a and the second heat storage container 12 b, and then the joint surface 15 a of the first heat storage container 12 a and 10 A of heat storage bodies are manufactured by joining the joining surface 15a of the 2nd heat storage container 12b (refer FIG. 1 etc.). The joining of the joining surface 15a of the first heat storage container 12a and the joining surface 15b of the second heat storage container 12b is, for example, by melting the vicinity of the joining surfaces 15a and 15b to cause a eutectic reaction to solidify the joining surfaces 15a and 15b. Join. Thereby, the heat storage material 11 corresponding to the internal shape of the heat storage container 12 is produced. In this embodiment, the powdery raw material 17 is used to fill the first heat storage container 12a and the second heat storage container 12b. However, the present invention is not limited to this. The material may be poured into the first heat storage container 12a and the second heat storage container 12b, or an ingot of the heat storage material may be put into the first heat storage container 12a and the second heat storage container 12b.

  Moreover, when the heat storage material 11 is comprised by a some component, it fills the inside of the 1st heat storage container 12a and the 2nd heat storage container 12b with the powder-form raw material of the some component which comprises the heat storage material 11. To make.

  In addition, the joining surfaces 15a and 15b are joined together by melting and solidifying the joining surfaces 15a and 15b and sealing them with a heat-resistant adhesive to join the joining surfaces 15a and 15b. Also good.

  In addition, the manufacturing method of the heat storage material 11 is not limited to the said method, For example, the heat storage material 11 shape | molded in the shape of the internal space of the heat storage container 12 is formed in advance, and the buffer member 13 around the heat storage material 11 Is formed by coating. Then, the heat storage body 10A can be manufactured by covering with the heat storage container 12 formed in advance so as to cover the heat storage material 11 and the buffer member 13. In addition, after forming the buffer member 13 by coating the raw material of the buffer member 13 around the heat storage material 11 formed in advance, the thermal storage container 12 is formed by further applying a ceramic raw material and solidifying by heating. Also good.

  In this way, the heat storage body 10A is buffered between the heat storage material 11 containing any one of a metal, an alloy, or a salt that melts and stores or dissipates heat by phase change and the heat storage container 12 made of ceramics. A member 13 is provided. For this reason, since the heat storage material 11 can prevent the heat storage material 11 from contacting the heat storage container 12 directly even if the heat storage material 11 changes in volume during the phase change process, the heat storage material 11 stores the heat. It reacts with the container 12 and erodes the interface of the heat storage container 12 to prevent the formation of an eroded layer. For this reason, even if the heat storage material 11 changes its volume in the process of phase change and expands, the heat storage container 12 can relieve the stress applied from the heat storage material 11 by the buffer member 13 and the heat storage container 12 is cracked or the like. It can suppress that it arises and it can control that damage to heat storage container 12 arises. As a result, it is possible to have excellent durability while maintaining the heat storage amount. Therefore, even when the heat storage container 12 is enlarged and, for example, the diameters T1 and T2 of the heat storage container 12 are set to 50 mm or more and the filling amount of the heat storage material 11 in the heat storage container 12 is increased, heat storage is maintained while maintaining high durability. The amount can be increased. Therefore, even if the heat storage body 10A is enlarged and the amount of heat storage is increased, the heat storage container 12 can be used stably without being damaged.

  In addition, when a small-sized capsule ceramic having a diameter of, for example, about 5 to 50 mm is used as in a known heat storage body that has been conventionally used, the manufacturing cost is increased because the molding is difficult. Since the heat storage container 12 can be used even if the diameters T1 and T2 are as large as 50 mm or more, the heat storage container 12 can be easily manufactured. For example, the heat storage container 12 can be used outside of a conventionally known heat storage body. The manufacturing cost of the heat storage container 12 can be reduced to about 1/20 of the shell.

  As described above, the heat storage body 10A includes, for example, a high-temperature regenerator of a solar power generation system, use of waste heat in a converter or a next-generation thermal power generation system, a heat source of a cooling / heating system that stores cold / heat by supplying cold / heat, and a thermoelectric Heat source for conversion systems, refrigeration / freezers, electrical products, OA equipment, bathtubs / bathrooms, cooler boxes, cushions, curtains, carpets, bedding, carpets, heat sources for clothing and footwear such as winter clothes, hats, gloves, etc. Suitable for heat source, tableware for heating or keeping food, heat source for building materials, heat exchanger for gas turbine, air preheater for boiler or heating furnace, exhaust gas purification device for automobiles, industrial products such as machinery / equipment be able to.

  Next, the present invention will be specifically described with reference to examples. However, the present invention is not limited by these examples.

<Example 1>
(Manufacture of heat storage body)
A ceramic raw material for forming a heat storage container was prepared. Specifically, the binder using acrylic resin and wax is 55:45 (alumina powder: binder) with respect to alumina powder (trade name “AL-160SG4”, manufactured by Showa Denko). A total of about 3000 g was weighed. While this was heated above the melting point of the binder, it was sufficiently kneaded with a pressure kneader. After sufficiently kneading, the obtained ceramic raw material was cooled and solidified. Next, the cooled and solidified ceramic material was crushed into pellets. The ceramic raw material crushed into pellets was put into an injection molding machine to produce a cylindrical shaped body having a cylindrical space inside. The cylindrical shaped body had a cross-sectional diameter of 50 mm. Next, the cylindrical shaped body was degreased by heating at 600 ° C. in an argon gas. Next, it heated and sintered to 1600 degreeC in air | atmosphere, and produced the thermal storage container which consists of ceramics. The obtained heat storage container had a height of 50 mm, a cross-sectional diameter of 50 mm, a wall thickness of 3 mm, and an internal cavity portion diameter of about 43 mm. The obtained heat storage container was divided | segmented into two and it was set as the 1st heat storage container and the 2nd heat storage container. In addition, the joining surface of the 1st heat storage container and the 2nd heat storage container was made into the plane.

  Next, the raw material of the buffer member 1 (trade name “ISOPLAST PH61”, manufactured by Kinsei Matec Co., Ltd.) is applied to the inner walls of the obtained first heat storage container and second heat storage container, and then dried. And the buffer member was formed in the inner wall of the 2nd heat storage container.

  Next, the powdery raw material constituting the heat storage material so as to fit in the internal space of the first heat storage container and the second heat storage container inside the first heat storage container and the second heat storage container in which the buffer member is formed on the inner wall Al powder was filled as Next, the first heat storage container and the second heat storage container were melted in the vicinity of their joint surfaces to cause a eutectic reaction to be solidified and joined. Thereby, the heat storage body provided with the heat storage container which included the heat storage material and the buffer member as shown in FIG. 1 was manufactured. Table 1 shows the raw materials for the heat storage material, the heat storage container, and the buffer member.

(Evaluation)
The heat storage body thus obtained was heated at 600 ° C. for 2 hours and then cooled, and it was observed whether or not a crack was generated in the heat storage container. Table 1 shows the observation results of the presence or absence of cracks in the heat storage container.

<Examples 2 to 20, Comparative Examples 1 to 10>
In Example 1, the heat storage material is an Al—Si alloy (Al: Si = 88: 12, manufactured by Venus), the heat storage container is alumina titanate (trade name “2-7905-03”, manufactured by ASONE), Si _3. N ₄ (manufactured by Venus), SiC (trade name “5-56-3-11”, manufactured by ASONE) or Sialon (manufactured by Venus), buffer member 1 as buffer member 2 (trade name “ZYP BN coating”, A heat accumulator was produced in the same manner as in Example 1 except that the product was changed to Pyrotech Japan Co., Ltd.

  As shown in Table 1, the heat storage container of the heat storage body using the buffer member 1 or the buffer member 2 did not cause breakage such as cracks (see Examples 1 to 20). On the other hand, damage such as cracks occurred in the heat storage container of the heat storage body in which the buffer member 1 and the buffer member 2 were not provided (see Comparative Examples 1 to 10). Therefore, by providing a buffer member between the heat storage container and the heat storage material, it is possible to suppress the occurrence of cracks or the like in the heat storage container.

10A to 10D Thermal storage body 11 Thermal storage material 12, 12a, 12b Thermal storage container (outer shell)
13, 13A, 13B Buffer member 15a, 15b Joint surface 16a, 16b Fitting part 17 Raw material

Claims (8)

A heat storage material having heat storage properties;
A heat storage container that houses the heat storage material therein;
A buffer member that is provided between the heat storage material and the heat storage container and relaxes the stress that the heat storage material applies to the heat storage container;
A heat storage body characterized by comprising:   The heat storage body according to claim 1, wherein the buffer member includes at least a metal oxide selected from the group consisting of Al, Ti, Si, Na, K, and Zr, W, Mo, or boron nitride.   The heat storage body according to claim 2, wherein the buffer member includes 10% by mass or more of boron nitride.   The heat storage material comprises at least one selected from the group consisting of Al, Mg, Si, Cu, Zn, Sn, and an alloy containing any one of these metals. The heat storage body as described in one item.   The heat storage material comprises at least an alkali metal or alkaline earth metal carbonate, hydroxide, or chloride selected from the group consisting of K, Li, Na, Ca, and Mg. The heat storage body as described in any one of.   The heat storage container comprises ceramics selected from the group consisting of aluminum oxide, magnesium oxide, aluminum titanate, aluminum nitride, silicon nitride, silicon dioxide, silicon carbide, and boron carbide. The heat storage body according to one item.   The heat storage body according to any one of claims 1 to 6, wherein the heat storage container has a cylindrical shape, and a diameter in a cross-sectional shape of the cylinder is 50 mm or more.   The heat storage body according to any one of claims 1 to 7, wherein the heat storage container is spherical and the diameter of the heat storage container is 50 mm or more.

Images