WO2012147676A1 - Heat storage member, storage container using same, and method for manufacturing storage container - Google Patents

Abstract

[Problem] The present invention relates to a heat storage member using a latent heat storage material, a storage container using the same, and a method for manufacturing the storage container, and the purpose of the invention is to provide a heat storage member in which a change in the shape does not easily occur during manufacture or when in use, a storage container using the same, and a method for manufacturing the storage container. [Solution] A storage container (100) comprises: a storage room (105) for storing an object to be stored; a heat insulating material (9) provided to surround the storage room (105) to block the movement of heat between the storage room (105) and the outside; and heat storage members (3a, 3b) provided between the storage room (105) and the heat insulating material (9) to store the heat of the storage room (105). Each of the heat storage members (3a, 3b) comprises: a latent heat storage material (5) which is formed in a predetermined shape and reversibly undergoes a phase transition from a solid phase to a liquid phase at a predetermined temperature; and a sealing film (7) serving as a shape change prevention part that, even when a predetermined pressure higher than the atmospheric pressure is applied to the latent heat storage material (5), prevents the predetermined shape from changing.

Description

Heat storage member, storage container using the same, and method for manufacturing storage container

The present invention relates to a heat storage member using a latent heat storage material, a storage container using the same, and a method for manufacturing the storage container.

Conventionally, a cold storage type cool box in which a latent heat storage material that stores thermal energy using latent heat associated with a phase transition between a solid phase and a liquid phase is arranged around a storage chamber is known (for example, Patent Document 1). Further, there is known a cooling sheet that is used by sealing a gel-like cold insulating material in a cooling case having irregularities, bending the cooling case at a concave portion, deforming it, and contacting a cooling target having a curved surface such as skin. (For example, Patent Document 2).

JP 58-219379 A JP 2011-19585 A

The cold storage type cold storage disclosed in Patent Document 1 has a two-layer structure of a heat insulating material and a cold storage material. However, Patent Document 1 does not disclose a manufacturing method capable of realizing a two-layer structure of a heat insulating material and a cold storage material. Since the cold storage type cool box uses a liquid heat storage material, a member including the heat storage material is not stable or a strong reinforcing member is required to stabilize the member. In addition, the liquid heat storage material has a problem that the position balance in the warehouse is lost due to phase transition.

In addition, the cooling sheet disclosed in Patent Document 2 does not consider the bonding property with other members having a shape other than a curved surface. Since the cooling sheet has a concavo-convex portion, contact with a flat member such as the inner wall of a refrigerator cannot be sufficiently obtained, and the heat absorption and radiation characteristics may be deteriorated. Further, for example, when the cooling sheet is applied to a refrigerator, the contact between the cooling case and the inner wall of the refrigerator is deteriorated due to the unevenness, and the position of the cooling sheet may be shifted at the time of injecting urethane foam.

An object of the present invention is to provide a heat storage member that does not cause a positional shift during manufacturing or actual use and hardly changes in shape, a storage container using the same, and a method for manufacturing the storage container.

The object is to form a latent heat storage material that is formed in a predetermined shape and reversibly changes phase from a solid phase to a liquid phase at a predetermined temperature, and the predetermined shape even if a predetermined pressure higher than atmospheric pressure is applied to the latent heat storage material. It is achieved by a heat storage member characterized by having a shape deformation preventing part for preventing the deformation of the heat sink.

The heat storage member of the present invention is characterized in that the shape deformation preventing portion is a sealing film that encloses and seals the latent heat storage material.

The heat storage member of the present invention, wherein the sealing film has a gas barrier property so that gas generated from the latent heat storage material does not leak.

The heat storage member of the present invention described above, further comprising a heat conductive film formed on the sealing film.

The heat storage member according to the present invention, wherein the shape deformation preventing portion is a thin plate material.

The heat storage member of the present invention is characterized in that the thin plate material is disposed on a surface that contacts the predetermined member to which the predetermined pressure is applied in the widest area.

The heat storage member according to the present invention, wherein the latent heat storage material includes a gelling agent.

The heat storage member according to the present invention, wherein the latent heat storage material includes paraffin.

The heat storage member of the present invention is characterized in that the heat storage member is formed such that a part of the surface follows a surface of a member different from the predetermined member to which the predetermined pressure is applied.

In addition, the object is to provide a storage chamber for storing a stored product, a heat insulating material that surrounds the storage chamber and blocks heat transfer between the storage chamber and the outside, and the storage chamber and the heat insulating material. And a heat storage member that accumulates the heat of the storage chamber, wherein the heat storage member is a heat storage member of the present invention. .

The storage container of the present invention, wherein the heat storage member is the heat storage member of the present invention, and the surface of the another member is the back surface of the wall surface of the storage chamber.

The storage container according to the present invention, wherein the heat storage member is arranged by fitting the part of the heat storage member into a back surface of a wall surface of the storage chamber.

Further, the object is composed of a storage room for storing stored items, a heat storage member that encloses a latent heat storage material that reversibly changes between a solid phase and a liquid phase in a use temperature range, and a foam. The latent heat storage material is not fluid in the operating temperature range, a part of the heat storage member is in contact with an inner wall of the storage chamber, and another part of the heat storage member is the heat insulation member The heat storage member has a burst strength of 5.5 × 10 ⁴ N / m ² or more, and the heat storage member has a gas barrier property with respect to the latent heat storage material.

Another object of the present invention is to provide a method for manufacturing a storage container that stores a stored product in a storage chamber, and seals a sealing film filled with a latent heat storage material that reversibly changes from a solid phase to a liquid phase at a predetermined temperature. The heat storage member is formed by processing the sealing film so that the shape of a part of the front surface follows the back surface of the wall surface of the storage chamber, and the heat storage member is formed on the wall surface with the back surface facing a part of the surface. It is achieved by a method for manufacturing a storage container, comprising: attaching a member; providing a predetermined space between the back surface and the heat storage member; attaching an outer wall to the storage chamber; and injecting a heat insulating material into the predetermined space. The

According to the present invention, the position of the heat storage member does not shift during manufacturing or actual use, and the shape does not easily change, the manufacturing process of the storage container is simplified, and the cooling effect of the storage container is improved.

It is a perspective view which shows schematic structure of the storage container 100 by the 1st Embodiment of this invention. It is a figure which shows schematic structure of the cross section of the storage container 100 by the 1st Embodiment of this invention. It is FIG. (1) explaining the manufacturing method of the storage container 100 by the 1st Embodiment of this invention. It is FIG. (2) explaining the manufacturing method of the storage container 100 by the 1st Embodiment of this invention. It is a figure explaining the problem of the manufacturing process of the conventional storage container. It is a figure which shows schematic structure of the cross section of the storage container 100 by the modification 1 of the 1st Embodiment of this invention. It is a figure which shows schematic structure of the cross section of the storage container 100 by the modification 2 of the 1st Embodiment of this invention. It is a figure explaining the manufacturing method of the storage container 100 by the modification 2 of the 1st Embodiment of this invention. It is the modification 3 of the 1st Embodiment of this invention, Comprising: It is a figure which shows schematic structure of the thermal storage member unit 6,8. FIG. 5 is a diagram showing a schematic configuration of a heat storage member 10 according to a fourth modification of the first embodiment of the present invention. It is a figure which shows schematic structure of the cross section of the storage container 150 by the 2nd Embodiment of this invention. It is FIG. (1) explaining the manufacturing method of the storage container 150 by the 2nd Embodiment of this invention. It is FIG. (2) explaining the manufacturing method of the storage container 150 by the 2nd Embodiment of this invention.

[First Embodiment]
A heat storage member according to a first embodiment of the present invention, a storage container using the same, and a method for manufacturing the storage container will be described with reference to FIGS. In all of the following drawings, the dimensions and ratios of the constituent elements are appropriately varied for easy understanding. First, schematic configurations of the heat storage members 3, 3a, 3b and the storage container 100 according to the present embodiment will be described with reference to FIGS.

FIG. 1 is a perspective view illustrating a schematic configuration of a storage container 100 according to the present embodiment. In FIG. 1, the storage container 100 with the door portion 102 opened is shown, but the door portion 102 in the closed state is shown together with a two-dot chain line for easy understanding. The storage container 100 is used for storing stored items at a temperature different from the atmospheric temperature (room temperature) during steady operation, and examples thereof include a cold storage such as a refrigerator and a freezer, and a warm storage. In the present embodiment and the second embodiment to be described later, the storage container is described as being a direct cooling refrigerator.

As shown in FIG. 1, a storage container 100 according to the present embodiment is provided rotatably on a container body 104 via a rectangular parallelepiped container body 104 and a hinge portion (not shown) as shown by double-ended arrows in the figure. And a thin plate-shaped door 102. The container main body 104 has a rectangular opening 103, a box-shaped wall 109 opened by the opening 103, and a storage chamber 105 for storing stored items. A freezer compartment (not shown) is arranged above the storage chamber 105, and a refrigerator compartment (not shown) is arranged below it. The storage chamber 105 is connected to the outside through the opening 103 when the door 102 is opened. The storage chamber 105 is a space provided inside the wall portion 109. The door part 102 has a frame-shaped packing 107 provided on the outer periphery of the door part 102. The packing 107 is arranged outside the outer periphery of the opening 103 when the door 102 is closed. The packing 107 is arranged to face the wall portion 109 when the door portion 102 is closed. When the door portion 102 is closed, the storage chamber 105 becomes a sealed space surrounded by the door portion 102, the packing 107, and the wall portion 109. Thereby, the storage container 100 can maintain the inside of the storage chamber 105 at a preset temperature.

The storage container 100 is disposed in the storage chamber 105 and has a shelf member 111 on which stored items such as food are placed. The shelf member 111 is disposed on a shelf receiving portion 11 a formed to protrude into the storage chamber 105. A shelf member 111 disposed at a predetermined position in the storage chamber 105 divides the refrigerator compartment in the storage chamber 105 into two. The door portion 102 has a door storage portion 113 that is disposed in the storage chamber 105 when the door portion 102 is closed. On the side wall portions 113a on both sides of the door storage portion 113, a heat storage member 3 described later is provided.

FIG. 2 shows a state in which a cross section of the storage container 100 cut along the AA ′ line in FIG. 1 in the illustrated vertical direction (the direction of the arrow AA) is observed from the door 102 side. . As shown in FIG. 2, the storage container 100 is provided so as to surround the storage chamber 105, and a heat insulating material (predetermined member) 9 that blocks the movement of heat between the storage chamber 105 and the outside, and the storage chamber 105 and the heat insulation. It has thermal storage members 3a and 3b which are provided between the materials 9 and store the heat of the storage chamber 105. The heat storage member 3 and the heat insulating material 9 are disposed in a space formed by the outer wall 13 of the container body 104 and the inner wall 11 of the storage chamber 105.

The heat insulating material 9 is arranged to insulate the storage chamber 105 cooled to a predetermined temperature so that heat is not transmitted from the outside of the storage container 100. The heat insulating material 9 is formed using a forming material such as a fiber heat insulating material (glass wool or the like) or a foamed resin heat insulating material. In the present embodiment, the heat insulating material 9 is formed of a foamed resin-based heat insulating material (foamed material such as foamed urethane or polystyrene foam).

The heat storage members 3a and 3b are formed in a predetermined shape, and the latent heat storage material 5 that reversibly undergoes phase transition (phase change) between a solid phase and a liquid phase at a predetermined temperature, and the heat insulating material 9 is higher than atmospheric pressure. It has the sealing film 7 as a shape deformation prevention part which prevents that the said predetermined shape of the latent heat storage material 5 deform | transforms even if a predetermined pressure is applied. The heat storage members 3a and 3b are stuck and fixed to the inner wall 11 using, for example, an adhesive tape. In FIG. 2, two heat storage members 3a and 3b are shown. The heat storage member 3a disposed relatively upward has a thin plate shape including a convex portion fitted in the concave portion of the shelf receiving portion 11a in the vicinity of one end side. The cross section of the heat storage member 3a has an inverted L shape. The heat storage member 3 b disposed below the heat storage member 3 a has a thin plate shape having a flat surface along the flat surface of the inner wall 11. The cross section of the heat storage member 3b is formed in a rectangular shape. The heat storage members 3a and 3b are provided in close contact with the inner wall 11 with almost no gap.

The shape of the contact surfaces of the heat storage members 3 a and 3 b that contact the inner wall 11 is formed to follow the shape of the contacted surface of the inner wall 11. In other words, the contact surfaces of the heat storage members 3 a and 3 b have a shape along the shape of the contacted surface of the inner wall 11. The contact surface of the heat storage member 3 a is formed in a convex shape that follows the concave shape of the contacted surface of the inner wall 11. The convex portion of the heat storage member 3 a is fitted in the concave portion of the inner wall 11. Further, the remaining contact surface of the heat storage member 3a is in close contact with the flat surface of the contacted surface of the inner wall 11 without any gap. The heat storage member 3a has a convex portion that bites into the concave portion of the inner wall 11 and can be in close contact with the inner wall 11 without a gap with a relatively large flat surface. Therefore, the heat storage member 3a is firmly fixed to the inner wall 11. Is done. Further, the contact surface of the heat storage member 3b is formed in a flat shape that follows the flat shape of the contacted surface of the inner wall 11 of the warehouse. The contact surface of the heat storage member 3b and the contacted surface of the inner wall 11 can be in close contact with each other over a relatively large area. Thereby, the heat storage member 3b is firmly fixed to the internal wall 11.

The heat storage members 3, 3a, 3b are usually used in a predetermined operating temperature range and operating pressure range. For example, the heat storage members 3, 3 a, and 3 b store cold heat by being cooled by the cold air in the storage chamber 105 when the storage container 100 is operating, and cool heat when the operation of the storage container 100 is stopped during a power failure or the like. It discharges and the inside of the storage chamber 105 is cooled for a predetermined time. In this case, the temperature range from the set temperature (internal temperature) of the storage container 100 during operation to the ambient temperature (for example, room temperature) of the storage container 100 installation location is included in the operating temperature range of the heat storage members 3, 3 a, 3 b. . The operating pressure of the heat storage members 3a and 3b is, for example, a pressure applied from the heat insulating material 9 during actual use and manufacture of the storage container 100.

The latent heat storage material 5 is sealed in a sealing film 7. Thermal storage refers to a technique for temporarily storing heat and extracting the heat as needed. Examples of the heat storage method include sensible heat storage, latent heat storage, chemical heat storage, and the like, but in this embodiment, latent heat storage is used. Latent heat storage uses the latent heat of a substance to store the thermal energy of the phase change of the substance. The heat storage density is high and the output temperature is constant. As the latent heat storage material 5, ice (water), paraffin, an inorganic salt-based aqueous solution, or the like is used.

The latent heat storage material 5 of the present embodiment includes paraffin. Paraffin is a generic name for saturated chain hydrocarbons represented by the general formula C _n H _{2n + 2} . In the present embodiment, the phase change temperature at which the phase change between the solid phase and the liquid phase of the latent heat storage material 5 reversibly is desirably about 4 ° C. to 6 ° C.

The latent heat storage material 5 includes a gelling agent that gels (solidifies) paraffin. A gel refers to a gel that has a three-dimensional network structure formed by cross-linking molecules, and has absorbed and swelled a solvent therein. A gelling agent produces a gelling effect only by being contained in paraffin by several weight%. In the gelled latent heat storage material 5, the gelling agent becomes a polymer having a molecular weight (for example, a molecular weight of 10,000 or more) larger than the molecular weight of paraffin. The gelatinized latent heat storage material 5 does not have fluidity in the operating temperature range. Moreover, since the intensity | strength of the latent heat storage material 5 itself can be raised by gelatinization, the intensity | strength as the heat storage member 3, 3a, 3b can be raised.

In the present embodiment, for example, n-tetradecane (molecular formula: C ₁₄ H ₃₀ ) is used as the latent heat storage material 5. The melting point of n-tetradecane is 5.9 ° C. For example, when the storage container 100 is a refrigerator having a set temperature of 3 ° C. and the assumed outside air temperature is 25 ° C., the latent heat storage material 5 has a solid-liquid phase transition temperature higher than 3 ° C. and lower than 25 ° C. and stored. A phase transition between the liquid phase and the solid phase occurs at a temperature between the set temperature of the chamber 105 and the ambient temperature.

The sealing film 7 is made of, for example, polyethylene terephthalate (PET). The sealing film 7 encloses and seals the latent heat storage material 5. The storage container 100 prevents the latent heat storage material 5 from changing its shape or breaking due to the foaming pressure in the urethane foaming process in the process of injecting the heat insulating material 9 at the time of manufacturing the storage container 100. Moreover, the sealing film 7 has a gas barrier property so that gas generated from the latent heat storage material 5 that is an organic heat storage material does not leak. Thereby, the sealing film 7 can prevent the gas from leaking into the storage chamber 5.

Each cross-sectional shape of the upper surface side, the bottom surface side, the back surface side, the left side surface side, and the door portion 102 of the container body 104 has substantially the same configuration as the cross-sectional shape of the right side wall shown in FIG. The heat storage member provided in each of these regions is formed so that the shape of the contact surface with the internal wall 11 follows the shape of the contacted surface of the internal wall 11, as with the heat storage members 3 a and 3 b shown in FIG. 2. ing.

Although illustration is omitted, the storage container 100 has a pipe for supplying a refrigerant to the evaporation mechanism in the cooler inside the container body 104. The piping is connected to a compressor accommodated in a compressor accommodating portion disposed on the bottom surface of the container main body 104. Thereby, a gas compression type cooling device is configured. Instead of the gas compression cooling device, a gas absorption cooling device or an electronic cooling device using the Peltier effect may be used.

Next, the operation of the storage container 100 according to this embodiment will be described. When the power supply (not shown) of the storage container 100 is turned on, the refrigerant compressed by the compressor is condensed in the pipe and then expanded to reach the cooler. The cooler cools the storage chamber 105 by heat of vaporization when the expanded refrigerant evaporates. A refrigerating room and a freezing room are provided in the storage room 105, and the cooling capacity of the cooler is higher on the freezing room side than on the refrigerating room side. For example, the temperature in the freezer compartment can be cooled to about −10 ° C. to −18 ° C., and the temperature in the refrigerator compartment can be about 3 ° C.

In the storage chamber 105, heat exchange is performed between the surface member of the cooler exposed in the storage chamber 105 and the air in the storage chamber 105. A temperature sensor (not shown) is installed at a predetermined position in the storage chamber 105. The driving of the cooling device is controlled by a temperature control device (not shown) provided in the storage container 100 based on the temperature in the storage chamber 105 measured by the temperature sensor, and heat transfer for controlling the temperature in the storage chamber 105 is performed. Done.

When a temperature distribution is generated in the air in the storage chamber 105, convection occurs, and the relatively hot air rises and the cool air falls. Since the cooler is disposed on the upper part of the inner wall of the storage chamber 105, the heat of relatively hot air can be efficiently transferred to the cooler.

When the power supply (not shown) of the storage container 100 is turned off due to a power failure or the like, the power supply to the temperature control device and the cooling device (not shown) is stopped, and the cooling capacity of the cooling device is lost. The storage container 100 according to the present embodiment starts cooling by the heat storage members 3, 3 a, 3 b when the cooling capacity of the cooling device is lost due to a power failure or the like. The air in the storage chamber 105 is maintained in a predetermined temperature range for a certain period by the heat storage members 3 a and 3 b provided around the storage chamber 105 and the heat storage member 3 provided in the door storage portion 113. More specifically, the temperature in the storage chamber 105 is maintained at about 5 ° C. until the latent heat storage material 5 undergoes a phase transition from the solid phase to the liquid phase. Further, a surface other than the surface where the heat storage member 3 is in contact with the internal wall 11 is covered with a heat insulating material 9. For this reason, the heat insulating material 9 prevents the cold heat stored in the heat storage members 3 a and 3 b from leaking to the outer periphery of the storage container 100. Thereby, the storage container 100 can extend the time during which the temperature in the storage chamber 105 is maintained at about 5 ° C.

Thus, the storage container 100 according to the present embodiment can keep the interior of the storage chamber 105 at a predetermined set temperature during steady operation. Further, the storage container 100 can keep the temperature in the storage chamber 105 at a set temperature for a certain period of time by the heat storage members 3, 3 a, 3 b even when the power supply is stopped due to a power failure and the operation is stopped. It is possible.

Next, a method for manufacturing the storage container will be described with reference to FIGS. 3 and 4 schematically show a method for manufacturing a storage container. 3 (a) and 3 (b) schematically show the manufacturing process of the heat storage member 3a, and FIGS. 3 (a) and 3 (c) schematically show the manufacturing process of the heat storage member 3b. Yes. FIG. 4A and FIG. 4B schematically show the assembly process of the storage container 100. FIG. 5 is a diagram for explaining problems in the manufacturing process of a conventional storage container 200 as a comparative example.

A method for manufacturing the heat storage member 3a will be described. First, a sealing film 7 having an opening in part is prepared. Next, the latent heat storage material 5 having a fluidity by heat melting at a temperature higher than the use temperature range is prepared. Next, as shown to Fig.3 (a), the latent heat storage material 5 which has fluidity | liquidity is filled into the sealing film 7 from the container 21 through an opening part. When a predetermined amount of latent heat storage material 5 is filled, the opening is closed and the sealing film 7 is sealed.

Next, as shown on the left side in FIG. 3B, the latent heat storage material 5 is placed in the heat storage member molding machine 25 at the stage where the latent heat storage material 5 has fluidity. The heat storage member molding machine 25 has a pair of mold parts 25a and 25b. By combining the mold part 25a and the mold part 25b, a mold having a desired shape of the heat storage member is configured. In this example, as shown between two thick arrows in the drawing of FIG. 3B, when the mold part 25a and the mold part 25b are combined, the shape of the shape of the heat storage member 3a (the cross section is an inverted L shape) Is configured.

Next, the sealing film 7 is processed so that the shape of a part of the surface follows the contacted surface (the back surface of the wall surface) of the inner wall 11 of the storage chamber 105 to form the heat storage member 3a. That is, the shape of a part of the surface is the surface of a member different from the predetermined member (in this example, the heat insulating material 9) applying a predetermined pressure (in this example, the back surface of the wall surface of the inner wall 11 of the storage chamber 105). ), The sealing film 7 is processed to form the heat storage member 3a. In this example, as indicated by a thick arrow on the left side of FIG. 3B, the sealing film 7 is sandwiched between the mold parts 25a and 25b, and the mold parts 25a and 25b are fixed. Thereby, the sealing film 7 is arrange | positioned at the thermal storage member molding machine 25 in a cross-sectional inverted L-shaped state. Next, the heat storage member molding machine 25 is cooled together with the sealing film 7 to a temperature (for example, room temperature) lower than the melting point of the gelling agent contained in the latent heat storage material 5. Thereby, the fluidity of the latent heat storage material 5 is lost, and the latent heat storage material 5 is solidified into the shape of the mold provided in the heat storage member molding machine 25. Next, the sealing film 7 is taken out from the heat storage member molding machine 25 as indicated by the thick arrow on the right side in FIG. Thus, the heat storage member 3a is formed.

Next, a method for manufacturing the heat storage member 3b will be described. By the method shown in FIG. 3A, the sealing film 7 in which the fluid latent heat storage material 5 is sealed is formed. Next, as shown on the left side in FIG. 3C, the latent heat storage material 5 is passed while the sealing film 7 is passed between the pair of rollers 23 when the latent heat storage material 5 has fluidity. Is cooled to a temperature lower than the melting point of the gelling agent contained in (for example, room temperature). The pair of rollers 23 has a cylindrical shape with a smooth surface without unevenness. A pair of roller 23 is arrange | positioned at the space | interval substantially equal to the thickness of the thermal storage member 3b. For this reason, when the sealing film 7 passes the pair of rollers 23, as indicated by the thick arrows shown in FIG. 3B, the heat storage member 3b having a thin plate shape and a rectangular cross section is formed.

When the heat storage members 3a and 3b are completed, the assembly process of the storage container 100 is performed next. First, a heat radiating pipe is attached to the outer wall 13 of the box-shaped container body 104. Next, the back surface of the inner wall surface on the side of the storage wall 105 where the stored items are stored is opposed to a part of the surface of the heat storage members 3a and 3b formed to follow the back surface. The heat storage members 3a and 3b are affixed to the inner wall 11 respectively. In this example, as indicated by a thick arrow in FIG. 4A, the concave portion of the shelf receiving portion 11a of the inner wall 11 of the storage chamber 105 and the convexity of the heat storage member 3a formed so as to follow the concave portion. The flat portion of the inner wall 11 and the flat portion of the heat storage member 3b formed so as to follow the flat portion are arranged opposite to each other, and the heat storage members 3a and 3b are stored using an adhesive tape. It is attached to the inner wall 11. At the same time when the heat storage members 3 a and 3 b are attached to the internal wall 11, a wiring cord (not shown) is attached to the internal wall 11. Thus, the storage container 100 according to the present embodiment can attach the heat storage members 3a and 3b to the inner wall 11 in the attachment process of the wiring cord or the like that has been executed in the conventional assembly process of the storage container. Moreover, the operation | work which attaches heat storage member 3a, 3b to the inner wall 11 is not different from the operation | work which attaches a wiring cord etc. to the inner wall 11 at all. For this reason, according to this Embodiment, the thermal storage member 3a, 3b can be attached to the inner wall 11 without increasing the manufacturing process of the conventional storage container.

Next, as shown in FIG. 4B, a predetermined space is provided between the back surface of the inner wall 11 and the heat storage members 3a and 3b, and the outer wall 13 of the container body 104 is attached to the inner wall 11 of the storage chamber 105. The storage chamber 105 and the outer wall 13 are integrated. Next, the heat insulating material 9 is injected into the predetermined space. In the step of injecting the heat insulating material 9, first, the container body 104 in which the inner wall 11 is fitted inside the outer wall 13 is stored in a urethane foam jig. Next, while maintaining the foaming jig at about 45 ° C., a foamed urethane stock solution such as a polyol solution and an isocyanate solution is simultaneously injected into a predetermined space between the outer wall 13 and the inner wall 11. As a result, urethane foam is filled in the space between the outer wall 13 and the inner wall 11. Thereafter, the container body 104 filled with urethane foam is removed from the foaming jig. Thereby, the injection | pouring process of the heat insulating material 9 is complete | finished. Since the temperature at which the fluidity of the latent heat storage material 5 increases in this embodiment is 70 to 80 ° C. or higher, the latent heat storage material 5 does not flow around during the urethane foam injection process.

Here, the problem of the injection | pouring process of the heat insulating material 9 in the conventional storage container 200 is demonstrated. As shown to Fig.5 (a), the latent heat storage material 5 with which the conventional storage container 200 was equipped is not included in the sealing film. For example, the fracture stress of the latent heat storage material 5 formed using n-tetradecane is about 4.2 × 10 ⁴ (N / m ² ) as measured by a rheometer. On the other hand, the force (foaming pressure) applied from the heat insulating material 9 to the latent heat storage material 5 in the urethane foaming process in the injection process of the heat insulating material 9 is about 5 × 10 ⁴ (N / m ² ). Thus, the foaming pressure of the heat insulating material 9 is higher than the breaking stress of the latent heat storage material 5. For this reason, as shown in FIG. 5 (a), the latent heat storage material 5 having a thin plate shape with a rectangular cross section before injection of the heat insulating material 9 does not fully resist the foaming pressure of the heat insulating material 9, FIG. As shown in (b), for example, the central portion is depressed and deformed. Further, the latent heat storage material 5 may be distorted in shape and may be displaced from the position before the heat insulating material 9 is injected. Further, as shown in FIG. 5C, the latent heat storage material 5 may break due to the foaming pressure of the heat insulating material 9. As described above, when the latent heat storage material 5 is deformed, displaced, or broken, the function as the heat storage member cannot be sufficiently exhibited, and, for example, at the time of a power failure, the cooling effect of the storage container 200 is reduced.

On the other hand, in the present embodiment, the latent heat storage material 5 is included in the sealing film 7 so as not to contact the heat insulating material 9. Further, the sealing film 7 has a strength sufficient to withstand the foaming pressure from the urethane foam in the injection process of the heat insulating material 9. The sealing film 7 has a burst strength (JIS-P-8112) higher than the foaming pressure during the injection process of the heat insulating material 9. Thereby, even if foaming pressure is applied, the latent heat storage material 5 does not leak to the urethane foam side. Further, since the pressure is dispersed through the sealing film 7, breakage of the latent heat storage material 5 due to the foaming pressure can be prevented. In the present embodiment, the burst strength of the sealing film 7 is set to be, for example, about 10% higher than the foaming pressure in consideration of variations in foaming pressure during the injection process of the heat insulating material 9. For example, the sealing film 7 has a bursting strength of about 5.5 × 10 ⁴ (N / m ² ). Here, the heat storage members 3a and 3b having a configuration in which the latent heat storage material 5 is included in the sealing film 7 having a burst strength of about 5.5 × 10 ⁴ (N / m ² ) as a whole are at least 5.5. It has a bursting strength of × 10 ⁴ (N / m ² ) or more. Further, for example, if the sealing films 7 in a state where a plurality of sheets are stacked have a burst strength of about 5.5 × 10 ⁴ (N / m ² ), the plurality of sealing films 7 include the latent heat storage material 5. The heat storage members 3a and 3b having the above-described configuration have a burst strength of at least 5.5 × 10 ⁴ (N / m ² ) or more as a whole.

The burst strength represents the strength when an internal pressure is applied to the member according to the above JIS standard. The member strength against the external pressure can be evaluated by substituting the breaking stress. That is, it is possible to measure the breaking stress at several places where the thickness of the member is uniform to some extent, and evaluate that the member has a predetermined burst strength if the value of the breaking stress is equal to or greater than a predetermined value. it can. More simply, a pressure higher than a predetermined value is applied to the entire member having high flatness so as to be sandwiched from above and below, and if the contents do not jump out, the member is evaluated as having a burst strength of a predetermined value. be able to.

Further, during actual use of the storage container 100, the pressure received by the heat storage members 3 a and 3 b from the heat insulating material 9 is lower than the foaming pressure when the heat insulating material 9 is injected. For this reason, the heat storage members 3a and 3b are prevented from being deformed or broken during the step of injecting the heat insulating material 9 or the actual use of the storage container 100 thereafter. The contact surface where the heat storage members 3 a and 3 b come into contact with the inner wall 11 is formed in a shape that follows the contacted surface of the inner wall 11. For this reason, the heat storage members 3a and 3b are less likely to be displaced during the injection process of the heat insulating material 9. Thereby, since the thermal storage members 3a and 3b can fully exhibit the thermal storage effect and the cold insulation effect as a design value, the storage container 100 can improve the cold insulation effect. In order to prevent misalignment, the inner wall 11 may be provided with unevenness, the heat storage member 3 may be formed in a shape following the unevenness, and the heat storage member 3 may be inserted into the unevenness provided on the inner wall 11. Moreover, the burst strength as a heat storage member can be raised by increasing the fracture stress (gel strength, jelly strength) of a latent heat storage material by increasing the addition amount of a gelatinizer. If the breaking stress of the gelled latent heat storage material is equal to or greater than a predetermined value, the heat storage member including the latent heat storage material has a predetermined value of fracture stress and a predetermined value of burst strength. Here, the predetermined value is, for example, 5.5 × 10 ⁴ (N / m ² ). The above measurement is preferably performed at both normal temperature and high temperature in consideration of the temperature environment before and after foaming. The high temperature is, for example, 50 ° C., which is slightly higher than the temperature at the time of foaming.

Further, the organic latent heat storage material 5 has volatility (for example, with n-tetradecane, the vapor pressure is about 1.55 Pa at room temperature (25 ° C.)), which may cause problems such as aging and effects on food. . In the storage container 100 according to the present embodiment, since the latent heat storage material 5 is sealed with the sealing film 7 having a high gas barrier property, it is possible to prevent the gas generated from the latent heat storage material 5 from affecting the food.

Returning to FIG. 1, the storage container 100 according to the present embodiment has the heat storage member 3 provided on the side wall 113 a of the door storage portion 113. The heat storage member 3 is formed of the same configuration and the same material as the heat storage members 3a and 3b except that the outer shape is formed in the same shape as the side wall portion 113a. The heat storage member 3 has a shape in which a latent heat storage material is sealed with a sealing film. Thereby, the heat storage member 3 can prevent the gas generated from the latent heat storage material from leaking into the storage chamber 105 and can prevent the gas from affecting the food. Thus, since the storage container 100 can arrange | position the thermal storage member 3 also in the storage chamber 105, it can further improve a cold insulation effect.

Next, a heat storage member and a storage container using the heat storage member according to a modification of the present embodiment will be described with reference to FIGS. In the following modifications, the same reference numerals are given to the constituent elements having the same functions and functions as the heat storage members 3a and 3b and the storage container 100 according to the present embodiment, and the description thereof is omitted. FIG. 6 shows a schematic configuration of a cross section of the right side wall of the container main body 104 as viewed from the door 102 side of the storage container 100 according to the first modification of the present embodiment. The schematic configuration and operation of the storage container 100 according to this modification are the same as those of the storage container 100 shown in FIG. The heat storage members 2a and 2b according to the present modification are characterized in that they include a heat conductive film 15 formed on the sealing film 7 which is a contact surface in contact with the inner wall 11 of the warehouse.

The heat storage members 2a and 2b are thermally conductive by, for example, aluminum vapor deposition on the surface of the sealing film 7 that will come into contact with the inner wall 11 in the future after the heat storage members 3a and 3b are formed by the same manufacturing method as shown in FIG. The film 15 is formed by vapor deposition. The heat conductive film 15 is made of aluminum having good heat conductivity. For this reason, the storage container 100 according to the present modified example can improve the heat transfer between the heat storage members 2a and 2b and the storage chamber 105, thereby improving the cooling effect. Moreover, since an aluminum vapor deposition film has a higher gas barrier effect than PET, the heat storage members 2a and 2b according to this modification have a higher gas barrier effect than the heat storage members 3a and 3b. The inner wall 11 may have a through hole at a predetermined location. Since the heat storage members 2a and 2b have the heat conductive film 15 on the contact surface side with the inner wall 11, the heat storage members 2a and 2b have the inside of the gas storage chamber 105 generated from the latent heat storage material 5 even if disposed on the through hole. Can be prevented from leaking.

By the way, if the heat conductive film 15 is formed on the entire surface of the sealing film 7, the heat conductive film 15 itself becomes a heat transfer path, so that the heat insulating layer by the heat insulating material 9 is formed by the thickness of the heat storage members 2a and 2b. It becomes equivalent to thinning. Since the heat storage members 2a and 2b according to this modification do not have the heat conductive film 15 on the entire surface of the sealing film 7, it is possible to substantially prevent the heat insulating layer from being thinned.

In the present modification, the sealing film 7 is formed of PET, but nylon may be used as a film having a high gas barrier property. Further, as a material for forming the sealing film 7, a multilayer film having a plurality of functions such as heat resistance and gas barrier properties, such as a two-layer film of polyethylene and nylon, may be used. Further, the sealing film 7 is made of a material having excellent heat resistance and having a heat resistance temperature equal to or higher than the fluidization temperature of the latent heat storage material, for example, 80 ° C. or higher, in order to seal the fluidized latent heat storage material of this embodiment. It is desirable.

Next, a heat storage member according to the second modification of the present embodiment, a storage container using the heat storage member, and a method for manufacturing the storage container will be described with reference to FIGS. FIG. 7 shows a schematic configuration of a cross section of the right side wall of the container main body 104 as viewed from the door 102 side of the storage container 100 according to this modification. The schematic configuration and operation of the storage container 100 according to this modification are the same as those of the storage container 100 shown in FIG. As shown in FIG. 7, the heat storage members 4 a and 4 b according to the present modification are a latent heat storage material 5 formed of an organic material and a combustion fire extinguishing material that is formed of a water-soluble material and extinguishes the combustion of the latent heat storage material 5. 17 is sealed in the sealing film 7. The combustion extinguishing material 17 may be formed of, for example, a water-soluble latent heat storage material. In this case, the combustion extinguishing material 17 exhibits a heat storage function as well as a fire extinguishing function.

Since the sealing film 7 has gas barrier properties, the gas generated from the latent heat storage material 5 and the combustion extinguishing material 17 can be prevented from leaking from the sealing film 7. The latent heat storage material 5 and the combustion extinguishing material 17 are arranged separately in the sealing film 7. The heat storage members 4a and 4b have an organic latent heat storage material 5 on the inner wall 11 side and a water-soluble combustion extinguishing material 17 on the heat insulating material 9 side. When the organic latent heat storage material 5 is used inside the warehouse, the heat transfer of the heat storage members 4a and 4b is reduced by increasing the gelling agent contained in the water-soluble combustion fire extinguishing material 17 to eliminate convection. be able to.

Next, a method for manufacturing the heat storage members 4a and 4b and the storage container 100 will be described with reference to FIG. FIG. 8 is a diagram for explaining a method of manufacturing the heat storage members 4a and 4b. First, a sealing film 7 having an opening in part is prepared. Next, the gelled organic latent heat storage material 5 and the gelled water-soluble combustion fire extinguishing material 17 are thermally melted at a temperature higher than the use temperature range, and the latent heat storage material 5 and the combustion fire extinguishing material 17 having fluidity are obtained. Prepare. Next, as shown in FIG. 8, the latent heat storage material 5 having fluidity and the combustion extinguishing material 17 having fluidity are simultaneously poured into the sealing film 7 from the container 21 through the opening. The latent heat storage material 5 and the combustion extinguishing material 17 are poured into the sealing film 7 in a state of being separated from each other, and a structure separated into an organic layer and an aqueous layer is formed in the sealing film 7. When a predetermined amount of latent heat storage material 5 and combustion extinguishing material 17 are filled, the opening film is closed and the sealing film 7 is sealed. Next, the heat storage members 4a and 4b are formed by the same method as shown in FIGS. 3B and 3C using the sealing film 7 having a structure separated into an organic layer and an aqueous layer. . Thereafter, the heat storage members 4a and 4b are affixed to the inner wall 11 and the heat insulating material 9 is filled in the space between the inner wall 11 and the outer wall 13 by the same method as shown in FIG. To do.

The storage container 100 according to this modification has the same effect as the storage container 100 shown in FIGS. 1 and 2 because the latent heat storage material 5 and the fire extinguishing material 17 are sealed with the sealing film 7. Furthermore, since the storage container 100 according to this modification has the water-soluble combustion extinguishing material 17, even if a flame spreads to the storage container 100 due to a fire or the like, the combustion extinguishing material 17 exhibits a self-extinguishing function. The fire can be extinguished early.

Next, a heat storage member according to Modification 3 of the present embodiment and a storage container using the heat storage member will be described with reference to FIG. FIG. 9 shows a schematic configuration of a heat storage member according to this modification. The schematic configuration and operation of the storage container 100 according to this modification are the same as those of the storage container 100 shown in FIG. The heat storage member according to this modification is characterized in that it is unitized. Fig.9 (a) is a top view which shows schematic structure of the thermal storage member unit 6 by this modification. As shown on the left side in FIG. 9A, the heat storage member unit 6 includes a first heat storage member 6a and a second heat storage member 6b. The first and second heat storage members 6a and 6b have the same configuration as the heat storage members 3a and 3b except that the outer shapes are different, and are formed of the same forming material.

The first heat storage member 6a has a rectangular shape as a whole in plan view, and has L-shaped concave portions at the four corners. The second heat storage member 6b has a rectangular shape as a whole in plan view, and has L-shaped convex portions at the four corners. As shown on the right side in FIG. 9, the first and second heat storage members 6a and 6b can be connected by fitting the convex portion of the second heat storage member 6b into the concave portion of the first heat storage member 6a. It has become. Thus, the heat storage member unit 6 according to the present modification can easily form a heat storage member having a desired length by alternately connecting the first and second heat storage members 6a and 6b.

FIG. 9B shows a schematic configuration of a cross section of another heat storage member unit 8 of this modification. As shown on the left side in FIG. 9B, the heat storage member unit 8 includes a first heat storage member 8a and a second heat storage member 8b. The first and second heat storage members 8a and 8b have the same configuration as the heat storage members 3a and 3b, except that the outer shapes are different, and are formed of the same forming material.

The first heat storage member 8a has a thin plate shape provided with a step portion formed by lifting one end surface. The second heat storage member 8b has a thin plate shape having substantially the same thickness as the first heat storage member 8a. As shown on the right side in FIG. 9B, the first and second heat storage members 8a and 8b can be connected by overlapping the step portion of the first heat storage member 8a on one end of the second heat storage member 8b. It has become.

Next, a heat storage member according to Modification 4 of the present embodiment and a storage container using the heat storage member will be described with reference to FIG. FIG. 10 shows a schematic configuration of a cross section of the heat storage member according to this modification. The schematic configuration and operation of the storage container 100 according to this modification are the same as those of the storage container 100 shown in FIG. As shown in FIG. 10, the heat storage member 10 according to the present modification is formed such that one end is thick. The portion where the thickness of the heat storage member 10 is relatively thick can store more cold heat. For this reason, the storage container 100 can improve the efficiency of cold insulation by arrange | positioning the thick part of the thermal storage member 10 in the site | part which wants to improve a cold insulation effect.

[Second Embodiment]
Next, a heat storage member according to a second embodiment of the present invention, a storage container provided with the same, and a method for manufacturing the storage container will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the component which show | plays the same effect | action and function as the storage container 100 by the said 1st Embodiment, and the description is abbreviate | omitted. Moreover, since the schematic structure and operation | movement of the storage container 150 in this Embodiment are the same as that of the storage container 100 by the said 1st Embodiment, description is abbreviate | omitted. FIG. 11 shows a schematic configuration of a cross section of the right side wall of the container body 104 as viewed from the door 102 side. As shown in FIG. 11, the storage container 150 is provided so as to surround the storage chamber 105, and a heat insulating material (predetermined member) 9 that blocks the movement of heat between the storage chamber 105 and the outside, and the storage chamber 105 and the heat insulating material. It has thermal storage members 33a and 33b which are provided between the materials 9 and store the heat of the storage chamber 105. The heat storage members 33 a and 33 b and the heat insulating material 9 are arranged in a space formed by the outer wall 13 of the container body 104 and the inner wall 11 of the storage chamber 105.

The heat storage member 33a and the heat storage member 33b are each formed in a predetermined shape, and a latent heat storage material (first latent heat storage material) 5 that reversibly transitions between a solid phase and a liquid phase at a predetermined temperature, and a heat insulating material 9 and a thin plate material 19 as a shape deformation preventing portion for preventing the predetermined shape of the latent heat storage material 5 from being deformed even when a predetermined pressure higher than atmospheric pressure is applied. The heat storage members 33a and 33b are stuck and fixed to the inner wall 11 using, for example, an adhesive tape. The shape of the latent heat storage material 5 provided in the heat storage member 33a has the same shape as the latent heat storage material 5 provided in the heat storage member 3a according to the first embodiment, and the latent heat provided in the heat storage member 33b. The shape of the heat storage material 5 has the same shape as the latent heat storage material 5 provided in the heat storage member 3b according to the first embodiment. The heat storage members 33a and 33b are provided in close contact with the inner wall 11 with almost no gap.

The shape of the contact surface of the heat storage members 33a and 33b that contact the inner wall 11 is formed to follow the shape of the contacted surface of the inner wall 11. The contact surface of the heat storage member 33 a is formed in a convex shape that follows the concave shape of the contacted surface of the inner wall 11. The convex portion of the heat storage member 3 is fitted into the concave portion of the inner wall 11. Further, the remaining contact surface of the heat storage member 33a is in close contact with the flat surface of the contacted surface of the inner wall 11 without any gap. The heat storage member 33a has a convex portion that bites into the concave portion of the internal wall 11 and can be in close contact with the internal wall 11 without a gap with a relatively large flat surface. Therefore, the heat storage member 33a is firmly fixed to the internal wall 11. Is done. Further, the contact surface of the heat storage member 33b is formed in a flat shape that follows the flat shape of the contacted surface of the inner wall 11. The contact surface of the heat storage member 33b and the contacted surface of the inner wall 11 can be in close contact with each other over a relatively large area. Thereby, the heat storage member 33b is firmly fixed to the inner wall 11.

The thin plate material 19 is made of, for example, polyethylene. The thin plate material 19 is formed to a thickness of 1.0 (mm), for example. The thin plate material 19 is disposed on the surface of the heat storage members 33a and 33b that are in contact with the heat insulating material (predetermined member for applying a predetermined pressure) 9 in the widest area. The thin plate material 19 is disposed on the back side of the contact surface where the heat storage members 33a and 33b contact the inner wall 11 of the warehouse. The thin plate material 19 has a strength that is not deformed or broken by the foaming pressure in the urethane foaming treatment of the heat insulating material 9 at the time of manufacturing the storage container 150. Therefore, the thin plate material 19 can prevent the latent heat storage material 5 from changing its shape or breaking due to the foaming pressure.

Next, a method for manufacturing the storage container 150 will be described with reference to FIGS. FIG.12 and FIG.13 has shown typically the manufacturing method of a storage container. FIG. 12 schematically shows a manufacturing process of the latent heat storage material 5 used for the heat storage member 33a. FIG. 13A to FIG. 13C schematically show the assembly process of the storage container 150.

First, a latent heat storage material 5 having a fluidity by heat melting at a temperature higher than the operating temperature range is prepared. Next, as shown on the left side in FIG. 12, the mold part provided in the latent heat storage material molding device 29 and formed in the shape of the heat storage member 33 a when the latent heat storage material 5 has fluidity. The latent heat storage material 5 is poured into 29a. When the mold part 29 a is completely filled with the latent heat storage material 5, the latent heat storage material molding machine 29 is moved together with the latent heat storage material 5 to a temperature lower than the melting point of the gelling agent contained in the latent heat storage material 5 (for example, room temperature). Cooling. Thereby, the fluidity of the latent heat storage material 5 is lost, and the latent heat storage material 5 is solidified into the shape of the mold part 29a. Next, the latent heat storage material 5 is taken out from the latent heat storage material molding device 29 as indicated by a thick arrow in FIG. Thereby, the latent heat storage material 5 used for the heat storage member 33a is formed.

Next, the latent heat storage material 5 used for the heat storage member 33b is formed. The latent heat storage material 5 is formed by the same method as the latent heat storage material 5 used for the heat storage member 33a except that the shape of the mold part 29a provided in the latent heat storage material molding machine 29 is different.

When the latent heat storage materials 5 for the heat storage members 33a and 33b are completed, the assembly process of the storage container 150 is performed next. First, a heat radiating pipe is attached to the outer wall 13 of the box-shaped container body 104. Next, the back surface of the inner wall surface of the storage wall 105 where the stored items are stored, and the surface of the latent heat storage material 5 for the heat storage members 33a and 33b formed to follow the back surface The latent heat storage material 5 is affixed to the inner wall 11 so as to face each other. In this example, the latent heat storage material 5 for the heat storage member 33a formed so as to follow the recess of the shelf receiving portion 11a of the inner wall 11 of the storage chamber 105 as shown by a thick arrow in the drawing of FIG. Are arranged opposite to the concave portion, the flat portion of the latent heat storage material 5 for the heat storage member 33b is arranged opposite to the flat portion of the inner wall 11 and the two latent heat storage materials 5 are attached to the inner wall using an adhesive tape. 11 is attached to each. At the same time when the two latent heat storage materials 5 are attached to the inner wall 11, a wiring cord (not shown) or the like is attached to the inner wall 11.

Next, as shown in FIG. 13B, a thin plate material 19 is attached to each of the two latent heat storage materials 5. Thereby, the heat storage members 33a and 33b are completed. Since paraffin, which is a material for forming the latent heat storage material 5, and polyethylene, which is a material for forming the thin plate material 19, have high adhesion, only the thin plate material 19 is placed on the latent heat storage material 5 without using an adhesive or the like. Thus, the thin plate material 19 can be attached to the latent heat storage material 5. Further, the thin plate material 19 may be formed of polycarbonate. Polycarbonate is not as close to paraffin as polyethylene. However, the thin plate material 19 formed of polycarbonate can be attached to the latent heat storage material 5 without using an adhesive or the like. Polycarbonate is excellent in heat resistance and impact resistance. For this reason, the thin plate material 19 formed of polycarbonate can improve the effect of preventing the displacement and shape change of the latent heat storage material 5.

As described above, the storage container 150 according to the present embodiment can attach the two latent heat storage materials 5 to the inner wall 11 in the attachment process of the wiring cord or the like that has been executed in the conventional assembly process of the storage container. The operation of attaching the two latent heat storage materials 5 to the internal wall 11 is not different from the operation of attaching a wiring cord or the like to the internal wall 11. Further, the thin plate material 19 can be attached to the latent heat storage material 5 very easily. For this reason, the operation | work which sticks the thin plate material 19 to the latent heat storage material 5 can be performed as part of attachment processes, such as a wiring cord. Therefore, according to the present embodiment, the heat storage members 33a and 33b can be attached to the inner wall 11 without increasing the number of manufacturing steps of the conventional storage container.

Next, as shown in FIG. 13C, a predetermined space is provided between the back surface of the inner wall 11 and the heat storage members 33 a and 33 b, and the outer wall 13 of the container body 104 is attached to the inner wall 11 of the storage chamber 105. The storage chamber 105 and the outer wall 13 are integrated. Next, the step of injecting the heat insulating material 9 in the first embodiment is performed to fill the space between the outer wall 13 and the inner wall 11 with urethane foam, and the step of injecting the heat insulating material 9 is completed. Since the temperature at which the fluidity of the latent heat storage material 5 increases in this embodiment is 70 to 80 ° C. or higher, the latent heat storage material 5 does not flow around during the urethane foam injection process.

Moreover, since the heat storage members 33a and 33b have the thin plate material 19, the storage container 100 has the shape of the latent heat storage material 5 by the foaming pressure in the urethane foaming process in the injection process of the heat insulating material 9 at the time of manufacturing the storage container 100. It can be prevented from changing or breaking.

Here, the latent heat amount of the latent heat storage material in the first or second embodiment will be quantitatively described. The following formula (1) represents the relationship between the amount of latent heat of the latent heat storage material and the amount of heat input from the outside. The left side of equation (1) represents the total latent heat amount of the latent heat storage material in a steady state (state where the whole of the latent heat storage material is a solid phase), and the right side is the heat input amount that is input from the outside through the heat insulating material. Represents. In the state where the entire latent heat storage material has changed to the liquid phase and all of the latent heat (cold heat) has been released to the outside, the left side and the right side of Equation (1) are equal. In formula (1), Q represents the amount of latent heat per unit mass of the latent heat storage material (kJ / kg), ρ represents the density (kg / m ³ ) of the latent heat storage material, and L is the thickness of the latent heat storage material. (M) and S represents the bottom area (m ² ) of the latent heat storage material. Further, κ ′ represents the thermal conductivity (W / m · K) of the heat insulating material, S ′ represents the bottom area (m ² ) of the heat insulating material, T represents the outside air temperature (° C.), and T ₀ represents the latent heat. It represents the phase change temperature (° C.) of the heat storage material, L ′ represents the thickness (m) of the heat insulating material, and t represents the holding time (h).

The density ρ of the latent heat storage material is 800 kg / m ³ , the thickness L of the latent heat storage material is 0.01 m, the thermal conductivity κ ′ of the heat insulating material is 0.025 W / m · K, and the outside air temperature T is 30 ° C. The phase change temperature T ₀ of the latent heat storage material is 6 ° C., the thickness L ′ of the heat insulating material is 0.04 m, the holding time t is 5 h, the bottom area S of the latent heat storage material and the bottom area S of the heat insulating material. Is the same, the latent heat quantity Q per unit mass of the latent heat storage material is 33.75 kJ / kg. That is, the latent heat amount of the latent heat storage material that is necessary at least in order not to lose the cooling effect even if a 5-hour power failure occurs is about 30 kJ / kg. However, although the thickness L of the latent heat storage material is 1 cm under the above conditions, the thickness L of the latent heat storage material is desirably 5 mm or less in consideration of disadvantages such as an increase in the weight of the storage container. When the thickness L of the latent heat storage material is 5 mm, at least the latent heat amount of the latent heat storage material necessary to maintain the cold insulation effect even when a power failure occurs for 5 hours is about 60 kJ / kg.

From these results, the latent heat amount per unit mass of the latent heat storage material in the present embodiment is desirably about 30 kJ / kg or more, and more desirably about 60 kJ / kg or more. Paraffin having a carbon chain number of about 10 to 16 (phase change temperature: −several tens to 20 ° C.) has a latent heat amount of 150 to 250 kJ / kg, and therefore sufficiently satisfies the above conditions. For example, the amount of latent heat of n-tetradecane (C ₁₄ H ₃₀ ) used as a latent heat storage material in the above embodiment is 200 to 250 kJ / kg.

Next, the gas barrier property of the sealing film in the first or second embodiment will be quantitatively described. First, the gas barrier property of a sealing film required when an inorganic latent heat storage material is used will be described. When an inorganic latent heat storage material is used, water is contained in the main component, so that the gas barrier property of the sealing film can be evaluated by the water vapor permeability. The left side of the following formula (2) represents the loss amount of the latent heat storage material, and the right side represents the amount of the latent heat storage material that is transmitted to the outside through the sealing film. The heat storage member (latent heat storage material) is assumed to be a uniform rectangular parallelepiped having a bottom area S (m ² ) and a height (thickness) L (m). Gas permeation from the surrounding area is not considered. In the formula (2), α represents the mass loss rate (%) of the latent heat storage material, ρ represents the density (kg / m ³ ) of the latent heat storage material, and L represents the thickness (m) of the latent heat storage material. , S represents the bottom area (m ² ) of the latent heat storage material. Moreover, t represents the permeability (g / m ² · day) of the sealing film, and y represents the retention year (year).

αρLS × 1000 = 2St (365 × y) (2)

The mass loss rate α of the latent heat storage material is 0.1 (10%), the density ρ of the latent heat storage material is 800 kg / m ³ , the thickness L of the latent heat storage material is 0.01 m, and the retention period y is 5 years. Then, the transmittance t of the sealing film is 0.22 g / m ² · day. That is, the permeability t of the sealing film necessary for setting the mass loss rate of the latent heat storage material over 5 years to 10% or less is 0.22 g / m ² · day or less.

Therefore, in this embodiment, it is desirable that the water vapor permeability (gas barrier property) of the sealing film when using an inorganic latent heat storage material is 0.22 g / m ² · day or less. For example, a generally known aluminum vapor-deposited PET film having a thickness of 25 μm (a film obtained by vapor-depositing aluminum on a PET film having a thickness of 25 μm) has a water vapor permeability of about 1 g / m ² · day, which is a target value (0.22 g / M ² · day). Since the transmittance is inversely proportional to the thickness of the film, if the thickness of the aluminum vapor-deposited PET film is 4 times 100 μm, the water vapor transmission rate is about 0.25 g / m ² · day, which almost reaches the target value. In addition to increasing the thickness of the film, the water vapor transmission rate can be further reduced by using a multilayer structure in which a large number of aluminum deposition layers are provided, or by using the films in layers.

Next, the gas barrier property of the sealing film required when an organic latent heat storage material (for example, paraffin) is used will be described. When an organic latent heat storage material is used, the gas barrier properties of the sealing film can be evaluated by the permeability (for example, paraffin permeability) of the latent heat storage material. However, since it is difficult to obtain data such as paraffin permeability, oxygen permeability is substituted in the following description. Using the above equation (2) and the ideal gas equation of state (PV = nRT), the mass loss rate α of the latent heat storage material is 0.1 (10%), and the density ρ of the latent heat storage material is 800 kg / m ^3. When the thickness L of the latent heat storage material is 0.01 m, the retention period y is 5 years, the vapor pressure P of paraffin is 1 atm (1 atm), the average molecular weight of paraffin is 200, and the temperature T is 300K The permeability t of the sealing film is 27.0 cc / m ² · day · atm. That is, the permeability t of the sealing film necessary for setting the mass loss rate of the latent heat storage material over 5 years to 10% or less is 27.0 cc / m ² · day · atm or less. Here, since paraffin has larger molecules and lower permeability than oxygen, it is sufficient to satisfy the condition of the permeability t. Since most of the sealing film is always in contact with the paraffin, the vapor pressure of the paraffin in contact with the sealing film is assumed to be approximately equal to the outside air pressure and is assumed to be 1 atm (1 atm).

Therefore, in the present embodiment, it is desirable that the permeability (gas barrier property) of the sealing film when using an organic latent heat storage material is 27.0 cc / m ² · day · atm or less. For example, the oxygen permeability of an aluminum-deposited PET film having a thickness of 25 μm is about 1 cc / m ² · day · atm, which is sufficiently lower than the target value (27.0 cc / m ² · day · atm). However, when paraffin is used as the latent heat storage material, the paraffin permeability of the sealing film used is measured according to the differential pressure method (JIS-K-7126), and it is actually confirmed that the paraffin permeability is below the target value. It is desirable to confirm to. Moreover, since the vapor pressure of paraffin can be suppressed by gelatinizing paraffin, the loss rate of the latent heat storage material can be reduced. As a film satisfying the above target value, 25 μm thick aluminum vapor-deposited polypropylene (oxygen permeability 20 cc / m ² · day · atm), 50 μm thick biaxially stretched nylon (oxygen permeability 15 cc / m ² · day · atm) ), 25 μm thick polyvinylidene chloride (oxygen permeability 13 cc / m ² · day · atm) may be used. Moreover, you may use the multilayer film which made these the base material.

The present invention is not limited to the above embodiment, and various modifications can be made.
For example, although the above embodiment has been described using a direct cooling refrigerator as a storage container, the present invention is not limited to this, and can be applied to a fan refrigerator.

In addition, for example, in the above embodiment, a refrigerator is used as a storage container. However, the present invention is not limited to this, and a storage room using a latent heat storage material having a phase transition temperature of, for example, several tens of degrees Celsius, and minus several tens of degrees Celsius. Of course, it can also be applied to a freezer using the latent heat storage material.

Further, for example, in the above-described embodiment, paraffin is used as the latent heat storage material, but the present invention is not limited to this, and water (ice) gelated with a water-soluble polymer or an inorganic salt aqueous solution (for example, depending on the application) Of course, the present invention can also be applied to a heat storage member and a cool box using water in which salt is melted by several weight percent.

Also, the above embodiments can be implemented in combination with each other.

The present invention can be widely used in the field of a heat storage member using a latent heat storage material, a storage container using the heat storage member, and a method for manufacturing the storage container.

2a, 2b, 3, 3a, 3b, 4a, 4b, 33a, 33b Thermal storage member 5 Latent heat storage material 6, 8 Thermal storage member unit 6a, 8a First thermal storage member 6b, 8b Second thermal storage member 7 Sealing film 11 Inner wall 11a Shelf receiving part 13 Outer wall 15 Thermal conductive film 17 Combustion fire extinguishing material 19 Thin plate material 25 Heat storage member molding machine 29 Latent heat storage material molding machine 100, 150, 200 Storage container 102 Door part 103 Opening part 104 Container body 105 Storage chamber 107 Packing 109 Wall Part 111 Shelf member 113 Door storage part 113a Side wall part

Claims (14)

1. A latent heat storage material that is formed in a predetermined shape and reversibly transitions from a solid phase to a liquid phase at a predetermined temperature;
   A heat storage member, comprising: a shape deformation preventing portion that prevents the predetermined shape from being deformed even when a predetermined pressure higher than atmospheric pressure is applied to the latent heat storage material.
2. The heat storage member according to claim 1,
   The heat storage member, wherein the shape deformation prevention part is a sealing film that encloses and seals the latent heat storage material.
3. The heat storage member according to claim 2,
   The heat storage member, wherein the sealing film has a gas barrier property so that gas generated from the latent heat storage material does not leak.
4. The heat storage member according to claim 2 or 3,
   The heat storage member further comprising a heat conductive film formed on the sealing film.
5. The heat storage member according to claim 1,
   The heat storage member, wherein the shape deformation preventing portion is a thin plate material.
6. The heat storage member according to claim 5,
   The heat storage member, wherein the thin plate material is disposed on a surface that contacts the predetermined member that applies the predetermined pressure in the widest area.
7. The heat storage member according to any one of claims 1 to 6,
   The said heat storage material contains the gelatinizer, The heat storage member characterized by the above-mentioned.
8. The heat storage member according to any one of claims 1 to 7,
   The said heat storage material contains paraffin. The heat storage member characterized by the above-mentioned.
9. The heat storage member according to any one of claims 1 to 8,
   The heat storage member is formed so that a part of its surface follows the surface of a member different from the predetermined member to which the predetermined pressure is applied.
10. A storage room for storing stored items;
    A heat insulating material that surrounds the storage chamber and blocks heat transfer between the storage chamber and the outside world;
    A storage container provided between the storage chamber and the heat insulating material, and having a heat storage member for accumulating heat of the storage chamber,
    The said heat storage member is a heat storage member as described in any one of Claim 1-8. The storage container characterized by the above-mentioned.
11. A storage container according to claim 10, wherein
    The heat storage member is the heat storage member according to claim 9,
    The storage container, wherein the surface of the another member is a back surface of the wall surface of the storage chamber.
12. A storage container according to claim 11,
    The storage container, wherein the heat storage member is disposed by fitting the part of the heat storage member into a back surface of the wall surface of the storage chamber.
13. A storage room for storing stored items;
    A heat storage member hermetically enclosing a latent heat storage material that reversibly changes phase between a solid phase and a liquid phase in the operating temperature range;
    And having a heat insulating member made of foam,
    The latent heat storage material has no fluidity in the operating temperature range,
    A part of the heat storage member is in contact with the inner wall of the storage chamber,
    The other part of the heat storage member is in contact with the heat insulating member,
    The heat storage member has a burst strength of 5.5 × 10 ⁴ N / m ² or more,
    The heat storage member has a gas barrier property with respect to the latent heat storage material.
14. A method of manufacturing a storage container for storing stored items in a storage chamber,
    Sealing the sealing film filled with the latent heat storage material that reversibly transitions from the solid phase to the liquid phase at a predetermined temperature,
    Forming a heat storage member by processing the sealing film so that the shape of a part of the surface follows the back surface of the wall surface of the storage chamber,
    Affixing the heat storage member to the wall surface with the back surface and a part of the surface facing each other,
    A predetermined space is provided between the back surface and the heat storage member to attach an outer wall to the storage chamber,
    A method of manufacturing a storage container, wherein a heat insulating material is injected into the predetermined space.

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