Heat insulating box

Abstract

To provide a heat insulating box capable of easily performing assembly work of the heat insulating box by a vacuum heat insulating panel.SOLUTION: A heat insulating box 10 includes a plurality of vacuum heat insulating panels 30, and a heat insulating space 10a which is surrounded by the plurality of vacuum heat insulating panels 30, wherein the vacuum heat insulating panels 30 have: a first inner surface 30a which forms the heat insulating space 10a; a first outer surface 30b which is opposite to the first inner surface 30a in a thickness direction orthogonal to the first inner surface 30a; and a first inclined surface 30c which is inclined in the thickness direction so that a cross-sectional area of the vacuum heat insulating panels 30 orthogonal to the thickness direction increases from the first inner surface 30a to the first outer surface 30b, and wherein the first inclined surfaces 30c are opposed to each other in the vacuum heat insulating panels 30 adjacent to each other.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to an insulated box that maintains its internal temperature over an extended period of time. [Background technology]

[0002] Conventionally, a known insulated box for keeping contents cool is an insulated container as disclosed in Patent Document 1. This insulated container includes an insulated container body made up of a combination of multiple vacuum insulation panels, and a heat shielding sheet that covers the insulated container body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-8313 Summary of the Invention [Problem to be solved by the invention]

[0004] The vacuum insulation panel of Patent Document 1 has a bottom panel that forms the bottom of the insulation container body, and a side panel that forms the side wall of the insulation container body. The side panel and the bottom panel are combined by inserting the lower end of the side panel between the bottom panel and the heat shield sheet. If the side panel is tilted during this insertion, the corner of the side panel will hit the bottom panel, damaging the vacuum insulation panel and reducing the insulation performance of the insulation container body. This poses the problem that the assembly work of the vacuum insulation panel is difficult. Furthermore, in insulation containers with large sizes such as containers, the vacuum insulation panel becomes large and heavy, making it more difficult to assemble the vacuum insulation panel.

[0005] The present disclosure has been made to solve such problems, and aims to provide an insulating box that can be easily assembled using vacuum insulation panels. [Means for solving the problem]

[0006] An insulating box according to one embodiment of the present invention comprises a plurality of vacuum insulation panels and an insulating space surrounded by a plurality of the vacuum insulation panels, wherein the vacuum insulation panels have a first inner surface forming the insulating space, a first outer surface which is the surface opposite the first inner surface in a thickness direction perpendicular to the first inner surface, and a first inclined surface which is inclined with respect to the thickness direction so that the cross-sectional area of ​​the vacuum insulation panel perpendicular to the thickness direction increases from the first inner surface to the first outer surface, and the first inclined surfaces of adjacent vacuum insulation panels face each other. Effect of the Invention

[0007] According to the present disclosure, for example, the gap between the first inclined surface of one of the adjacent vacuum insulation panels and the frame becomes larger the higher up. Therefore, even if the other vacuum insulation panel is inclined, the lower end of the other vacuum insulation panel can be easily inserted into the gap without hitting the other vacuum insulation panel. This makes it possible to easily assemble the vacuum insulation panels by aligning the first inclined surfaces of the adjacent vacuum insulation panels to face each other. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a heat insulating box according to a first embodiment of the present disclosure. [Diagram 2] FIG. 2 is an exploded perspective view of the insulating box. [Diagram 3] FIG. 3 is a cross-sectional view of a portion of the insulating box. [Figure 4] FIG. 4 is an exploded perspective view of a vacuum insulation panel. [Diagram 5] Fig. 5A shows the encapsulant used in the compression set test, Fig. 5B shows the encapsulant compressed by a compression plate, and Fig. 5C shows the encapsulant released from the compressed state. [Figure 6]Fig. 6A is a diagram showing a core formed of four core portions, Fig. 6B is a diagram showing a core formed of six core portions, Fig. 6C is a diagram showing a base material of the core portions used in the cores of Fig. 6A and Fig. 6B, and Fig. 6D is a diagram showing a base material of the core portions used in the core of Fig. 6B. [Figure 7] FIG. 7 is a cross-sectional view showing a part of a vacuum insulation panel according to the second modification. [Figure 8] FIG. 8 is an exploded perspective view of a heat insulating box according to the second embodiment of the present disclosure. [Figure 9] FIG. 9 is a cross-sectional view of the insulating box. [Figure 10] FIG. 10 is a view of the thermal storage panel as viewed from the inside in the thickness direction. [Figure 11] FIG. 11 is an exploded perspective view of the thermal storage panel. [Figure 12] Fig. 12A is a cross-sectional view of a thermal storage panel, and Fig. 12B is a cross-sectional view of a portion of the thermal storage panel. [Figure 13] FIG. 13 is a cross-sectional view of a thermal storage panel of a modified example. [Figure 14] Fig. 14A is a cross-sectional view of a portion of a heat storage panel in which a determination mark is provided on a filling bag. Fig. 14B is a view of the determination mark from a second through-hole through unfrozen heat storage material. Fig. 14C is a view of the second through-hole through frozen heat storage material. Fig. 14D is a cross-sectional view of a portion of a heat storage panel in which a determination mark is provided on a storage container. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the following, the same or corresponding elements are denoted by the same reference numerals throughout the drawings, and duplicated descriptions thereof will be omitted.

[0010] <Embodiment 1> <Insulating box> As shown in Fig. 1, the insulating box 10 according to the first embodiment is an insulated container that contains items such as medicines, specimens, and food in its insulating space 10a and is used for transporting and storing them. In the following, a case where the insulating box 10 is applied to a large container having a storage volume of, for example, 1200 L will be described, but the insulating box 10 is not limited to this and may be, for example, a portable insulating box. Also, in the example of Fig. 1, the insulating box 10 is attached to a pallet 11, but the insulating box 10 does not have to be attached to the pallet 11.

[0011] The insulating box 10 has, for example, a rectangular parallelepiped shape and includes a plurality of (for example, six) insulating plates 20 and an insulating space 10a, which is an internal space surrounded by these insulating plates 20. The insulating plates 20 are rectangular flat plates. The insulating plates 20 include an upper insulating plate 20a, a lower insulating plate 20b (FIG. 2) and four side wall insulating plates 20c1 to 20c4. The side wall insulating plates 20c1 to 20c4 include a front insulating plate 20c1, a rear insulating plate 20c2, a left insulating plate 20c3 and a right insulating plate 20c4, and form a square cylindrical side wall having an upper opening and a lower opening. The lower insulating plate 20b forms the bottom of the insulating box 10 that covers the lower opening of the side wall. The upper insulating plate 20a forms a lid of the insulating box 10 that can be opened and closed and covers the upper opening of the side wall.

[0012] <Thermal insulation board> As shown in FIG. 2, the insulation plate 20 has a vacuum insulation panel 30 and a protective plate 21 that protects the vacuum insulation panel 30. In the insulation plate 20, the side of the protective plate 21 facing the vacuum insulation panel 30 is referred to as the inside, and the opposite side is referred to as the outside. The outer surface of the protective plate 21 forms the outer surface of the insulation plate 20, and a first inner surface 30a, which is the inner surface of the vacuum insulation panel 30, forms the inner surface of the insulation plate 20. The first inner surfaces 30a of the vacuum insulation panels 30 of the six insulation plates 20 surround the periphery of the insulation space 10a of the insulation box 10. As a result, the first inner surface 30a forms the insulation space 10a.

[0013] The outer surface of the lower heat insulating plate 20b and the mounting frame 12 are attached to the upper surface of the rectangular flat pallet 11. The mounting frame 12 has a rectangular flat lower frame 12a and a rectangular flat outer frame 12b connected in an L-shape. The lower frame 12a is attached to the upper surface of the pallet 11 so that its inner edge is aligned with the outer peripheral edge of the lower heat insulating plate 20b. The outer frame 12b rises up from the outer edge of the lower frame 12a. The lower ends of the side wall heat insulating plates 20c1 to 20c4 are inserted between the lower heat insulating plate 20b and the outer frame 12b, so that the side wall heat insulating plates 20c1 to 20c4 are combined with the lower heat insulating plate 20b and rise upward from the lower frame 12a.

[0014] The outer surface of the protective plate 21 of the side wall insulating plates 20c1-20c4 is provided with, for example, two recessed handles 21a. Also, the outer surface of the protective plate 21 of the upper insulating plate 20a arranged on these side wall insulating plates 20c1-20c4 is provided with, for example, four handles 21a. This allows the user to easily carry and assemble the insulating plate 20 by using the handles 21a, even if the insulating box 10 is a container and the insulating plate 20 is large.

[0015] Further, for example, two engagement portions 22a of the locks 22 are attached to the outer surfaces of the protective plates 21 of the front and rear insulating plates 20c1 and 20c2. Further, for example, two engagement portions 22b of the locks 22 are attached to the front and rear ends of the protective plate 21 of the upper insulating plate 20a. The engagement portion 22a of the front insulating plate 20c1 and the engagement portion 22b at the front end of the upper insulating plate 20a are engaged with each other, and the engagement portion 22a of the rear insulating plate 20c2 and the engagement portion 22b at the rear end of the upper insulating plate 20a are engaged with each other, whereby the upper insulating plate 20a is fixed to the front insulating plate 20c1 and the rear insulating plate 20c2.

[0016] As shown in FIG. 3, the insulation board 20 has a heat insulator 23 and a protective frame 24 in addition to the vacuum insulation panel 30 and the protective plate 21. The heat insulator 23 is a rectangular flat plate and is made of a foam material such as polyethylene foam. The heat insulator 23 is disposed between the vacuum insulation panel 30 and the protective plate 21 in the thickness direction perpendicular to the first inner surface 30a of the vacuum insulation panel 30. In the orthogonal direction perpendicular to the thickness direction, the size of the heat insulator 23 is larger than that of the vacuum insulation panel 30, and the size of the protective plate 21 is larger than that of the heat insulator 23. Therefore, the inner surface of the heat insulator 23 covers the entire first outer surface 30b, which is the outer surface of the vacuum insulation panel 30, and the inner surface of the protective plate 21 covers the entire outer surface of the heat insulator 23. As a result, the vacuum insulation panel 30 is protected from external forces by the heat insulator 23 and the protective plate 21.

[0017] The vacuum insulation panel 30 has a first chamfered surface 30d connected to the outer peripheral edge of the first outer surface 30b, and a first flange 31 protruding perpendicularly from the outer peripheral edge of the first outer surface 30b. The first flange 31 is overlapped on the insulator 23 along the thickness direction and covered by the protective frame 24. This protective frame 24 is fixed to the inner surface of the protective plate 21, thereby attaching the vacuum insulation panel 30 and the insulator 23 to the protective plate 21. Furthermore, the protective frame 24 surrounds the periphery of the side surface of the insulator 23 and the periphery of the first chamfered surface 30d, and protects the side surface of the insulator 23 and the first chamfered surface 30d of the vacuum insulation panel 30.

[0018] <Vacuum insulation panel> 4, the vacuum insulation panel 30 has an exterior material 32 having an internal space, and a core material 33 housed in the internal space of the exterior material 32. The exterior material 32 is a molded body made of a material having gas barrier properties, and its internal space is depressurized to a predetermined pressure lower than atmospheric pressure and sealed. The exterior material 32 may have a thickness of, for example, 1.0 mm, and may have a laminated structure made of a heat-weldable thermoplastic resin layer, an air barrier layer such as an ethylene-vinyl alcohol copolymer or a polyvinyl alcohol polymer, and a water vapor barrier layer such as polypropylene.

[0019] The outer covering material 32 has, for example, a first inner wall 32a and a first outer wall 32b. The first inner wall 32a has a truncated pyramid shape such as a quadrangular pyramid shape, and has a rectangular opening, a first inner wall flange portion 32a1 surrounding the periphery of the opening, and a first inner wall recessed portion 32a2 recessed inward in the thickness direction from the first inner wall flange portion 32a1. The first outer wall 32b has a rectangular flat plate shape, and has a first covering portion 32b1 covering the opening of the first inner wall 32a, and a first outer wall flange portion 32b2 surrounding the periphery of the first covering portion 32b1. The first outer wall flange portion 32b2 has the same shape and size as the first inner wall flange portion 32a1. The first inner wall 32a is formed by, for example, vacuum molding, so that the outer covering material 32 can be manufactured at low cost without using expensive molding dies such as blow molding and injection molding.

[0020] In such an outer covering material 32, the core material 33 is inserted into the first inner wall recess 32a2 from the opening of the first inner wall 32a, and the opening of the first inner wall 32a is covered by the first covering portion 32b1 of the first outer wall 32b, so that the core material 33 is accommodated in the internal space of the outer covering material 32. Then, the first inner wall flange portion 32a1 and the first outer wall flange portion 32b2 are overlapped and heat-welded. The first flange 31 is formed by the heat-welded first inner wall flange portion 32a1 and the first outer wall flange portion 32b2. In addition, the first inner surface 30a, the first inclined surface 30c, and the first chamfered surface 30d of the vacuum insulation panel 30 are formed by the surface of the first inner wall recess 32a2 of the first inner wall 32a that is opposite to the surface facing the first outer wall 32b in the thickness direction. Furthermore, the first outer surface 30b of the vacuum insulation panel 30 is formed by the surface of the first covering portion 32b1 of the first outer wall 32b opposite to the surface facing the first inner wall 32a in the thickness direction. Then, air in the internal space of the exterior material 32 is sucked through a suction port provided in the first inner wall 32a or the first outer wall 32b, and the internal space of the exterior material 32 is depressurized. Then, the suction port is sealed with a sealing member, thereby sealing the internal space of the exterior material 32.

[0021] The core material 33 is made of a porous material with low thermal conductivity, and serves as the skeleton of the vacuum insulation panel 30 to form the internal space of the exterior material 32. The core material 33 has a first core material layer 33a made of glass wool, and a second core material layer 33b made of an open-cell foam such as polyurethane foam with an open-cell structure. The second core material layer 33b has a truncated pyramid shape such as a quadrangular pyramid shape, and has an inner surface and a core material depression 33b1 recessed from the inner surface. The first core material layer 33a has a rectangular flat plate shape, and is received in the core material depression 33b1 of the second core material layer 33b to form the core material 33 having a truncated pyramid shape such as a quadrangular pyramid shape.

[0022] In this way, the core material 33 is composed of two core material layers 33a, 33b laminated in the thickness direction, but it may be composed of one core material 33, or may be composed of three or more core material layers laminated in the thickness direction. In addition, the core material 33 is not limited to glass wool and polyurethane foam with an open-cell structure, and may be composed of a porous body such as an aggregate of glass fibers and an aggregate of inorganic fine particles.

[0023] 2, a gas adsorbent 34 may be accommodated in the internal space of the exterior covering material 32 of the vacuum insulation panel 30. For example, a recess is formed from the inner surface of the core material 33 of the vacuum insulation panel 30 outward in the thickness direction, and the gas adsorbent 34 is disposed in this recess and covered by the exterior covering material 32. The gas adsorbent 34 adsorbs gases such as water vapor and air that remain in or enter the internal space of the exterior covering material 32. This makes it possible to maintain the pressure in the internal space of the exterior covering material 32 low.

[0024] Furthermore, a pressure sensor 35 may be housed in the internal space of the exterior covering 32 of the vacuum insulation panel 30. The pressure sensor 35 has a pressure detection section 35a, a transmission section 35b, a power supply section 35c, and a sensor case 35d that houses these sections. When such a pressure sensor 35 is housed in the exterior covering 32, the exterior covering 32 is made of a non-metallic material, such as synthetic resin, that is permeable to radio waves for wireless communication. This allows the pressure detected by the pressure sensor 35 to be wirelessly communicated with the outside of the exterior covering 32.

[0025] The pressure detection unit 35a includes, for example, a heater and a thermocouple, and measures the surrounding thermal conductivity characteristics from the temperature detected by the thermocouple when the heater is heated, thereby measuring the air pressure (degree of vacuum) in the internal space of the outer covering material 32. However, the configuration of the pressure detection unit 35a is not limited to this, and for example, a microelectromechanical system (MEMS) such as a piezoelectric type, a capacitance type, or a vibration type may be used.

[0026] The transmitter 35b is electrically connected to the pressure detector 35a and transmits information related to the pressure detected by the pressure detector 35a to the outside of the covering material 32 by wireless communication. To this end, the transmitter 35b has a communication control IC, a memory, an antenna, etc. For example, the transmitter 35b is a short-range wireless communication device that uses a frequency band of 13.56 MHz and transmits information by NFC (Near Field Communication).

[0027] The power supply unit 35c is electrically connected to the voltage detection unit 35a and the transmission unit 35b and supplies power to them. For example, the power supply unit 35c has a power supply control IC and a power receiving unit for wireless power supply using a magnetic resonance method. This power receiving unit includes a secondary coil (power receiving coil) that receives power in a non-contact manner from a primary coil (power transmitting coil) outside the outer covering material 32. The power receiving coil receives power transmitted from the power transmitting coil, and the power supply control IC supplies this power to the voltage detection unit 35a and the transmission unit 35b.

[0028] The sensor case 35d is made of a non-metallic material such as resin, and has, for example, a flat plate shape in the thickness direction, with a plurality of through holes for communication between the inside and outside. Such a pressure sensor 35 is provided in each vacuum insulation panel 30 of the insulation box 10. In the internal space of the outer covering material 32 of this vacuum insulation panel 30, it is recessed from the inner surface of the core material 33 to the outside in the thickness direction, and the pressure sensor 35 is disposed in this recess and covered by the outer covering material 32. As a result, the pressure sensor 35 is disposed closer to the first inner surface 30a than the first outer surface 30b in the thickness direction.

[0029] As shown in Fig. 2, the thermal insulation performance of such a vacuum insulation panel 30 is inspected using a tester 13. The tester 13 has a receiver 13a and a power transmitter 13b, and is connected to a computer 13d. The receiver 13a includes, for example, a communication control IC, a memory, an antenna, and the like, and is capable of communicating with the transmitter 35b of the pressure sensor 35 of the vacuum insulation panel 30, for example, by NFC or the like. The power transmitter 13b includes a power transmission coil forming a primary coil, and generates a magnetic field when power is supplied from a power source.

[0030] In the inspection of the thermal insulation performance of the vacuum insulation panel 30 by the tester 13, the user brings the tester 13 into contact with the first inner surface 30a of the vacuum insulation panel 30 so as to face the pressure sensor 35 through the outer covering material 32 of the vacuum insulation panel 30. In this state, when the user supplies power to the power transmission unit 13b of the tester 13, the power transmission unit 13b generates a magnetic field, and electromagnetic induction occurs in the secondary coil (power receiving coil) of the power supply unit 35c of the vacuum insulation panel 30, and the pressure sensor 35 is supplied with power. With the power supplied in this way, the pressure sensor 35 detects pressure with the pressure detection unit 35a, and transmits information on the detected pressure from the transmission unit 35b. The transmitted information is received by the reception unit 13a of the tester 13 and sent to the computer 13d. The computer 13d judges whether the thermal insulation performance of the vacuum insulation panel 30 is acceptable based on the input information, and outputs (for example, displays) the result. In this way, the user can inspect the insulating performance of the vacuum insulation panel 30.

[0031] At least the portion of protective plate 21 facing pressure sensor 35 may be made of a material that transmits radio waves for wireless communication, such as resin. In this case, the user brings tester 13 into contact with the outer surface of the resin portion of protective plate 21. This allows tester 13 to face pressure sensor 35 via the resin portion of protective plate 21 and the outer covering material 32 of vacuum insulation panel 30, and to wirelessly communicate with pressure sensor 35. Therefore, tester 13 can also inspect the insulation performance of vacuum insulation panel 30 by receiving the pressure detected by pressure sensor 35.

[0032] As shown in Figs. 2 and 3, the vacuum insulation panel 30 has a truncated pyramid shape such as a quadrangular pyramid shape, and has a first inner surface 30a, a first outer surface 30b, a first inclined surface 30c, and a first chamfered surface 30d. The first inner surface 30a and the first outer surface 30b are rectangular and perpendicular to the thickness direction. The first inner surface 30a of the vacuum insulation panel 30 is formed by the first inner wall 32a of the outer covering material 32, and forms the inner surface of the insulation plate 20. The first outer surface 30b of the vacuum insulation panel 30 is formed by the first covering portion 32b1 (Fig. 4) of the first outer wall 32b of the outer covering material 32, and is a surface located opposite the first inner surface 30a across the core material 33 in the thickness direction, and faces the inner surface of the insulator 23 in the insulation plate 20. The area of ​​the first outer surface 30b is larger than the area of ​​the first inner surface 30a. A first flange 31 extends from the outer periphery of the first outer surface 30b of the vacuum insulation panel 30 so as to surround the periphery of the first outer surface 30b.

[0033] The first chamfered surface 30d has an outer end connected to the outer peripheral edge of the first outer surface 30b, and extends inward in the thickness direction from the outer peripheral edge of the first outer surface 30b. The first inclined surface 30c has an outer end connected to the inner end of the first chamfered surface 30d, and an inner end connected to the outer peripheral edge of the first inner surface 30a. The first inclined surface 30c is inclined with respect to the thickness direction and the perpendicular direction, and the inclination angle θ with respect to the thickness direction is 45 degrees. Due to this first inclined surface 30c, the cross-sectional area of ​​the vacuum insulation panel 30 perpendicular to the thickness direction becomes larger from the first inner surface 30a to the first outer surface 30b in the thickness direction, that is, toward the outside in the thickness direction.

[0034] When the insulation box 10 is formed by the insulation plates 20 including such vacuum insulation panels 30, the first inclined surfaces 30c of adjacent vacuum insulation panels 30 face each other. In the example of Fig. 3, the vacuum insulation panel 30 of the lower insulation plate 20b and the vacuum insulation panel 30 of the left insulation plate 20c3 are adjacent to each other, and the first inclined surface 30c of the lower insulation plate 20b faces the first inclined surface 30c of the left insulation plate 20c3. These facing first inclined surfaces 30c are provided parallel to each other.

[0035] 2 is adjacent to the vacuum insulation panels 30 of the front insulation panel 20c1, the rear insulation panel 20c2, and the right insulation panel 20c4, and the first inclined surface 30c of the vacuum insulation panel 30 of the lower insulation panel 20b faces the first inclined surface 30c of the vacuum insulation panel 30 of the insulation panels 20c1, 20c2, and 20c4. In addition, the vacuum insulation panel 30 of the upper insulation plate 20a is adjacent to the sidewall insulation plates 20c1 to 20c4, and the first inclined surface 30c of the vacuum insulation panel 30 of the upper insulation plate 20a faces the first inclined surface 30c of the sidewall insulation plates 20c1 to 20c4.

[0036] Furthermore, the vacuum insulation panel 30 of the front insulation plate 20c1 is adjacent to the vacuum insulation panels 30 of the left insulation plate 20c3 and the right insulation plate 20c4, and the first inclined surface 30c of the vacuum insulation panel 30 of the front insulation plate 20c1 faces the first inclined surface 30c of the vacuum insulation panel 30 of the insulation plates 20c3 and 20c4. Moreover, the vacuum insulation panel 30 of the rear insulation plate 20c2 is adjacent to the vacuum insulation panels 30 of the left insulation plate 20c3 and the right insulation plate 20c4, and the first inclined surface 30c of the vacuum insulation panel 30 of the rear insulation plate 20c2 faces the first inclined surface 30c of the vacuum insulation panel 30 of the insulation plates 20c3 and 20c4.

[0037] 3, the first inclined surface 30c is inclined with respect to the first inner surface 30a and the first chamfered surface 30d, so that the angle between the first inner surface 30a and the first inclined surface 30c and the angle between the first inclined surface 30c and the first chamfered surface 30d are greater than 90 degrees. Therefore, when assembling the vacuum insulation panels 30 with the first inclined surfaces 30c facing each other, even if the corner of one vacuum insulation panel 30 hits the other vacuum insulation panel 30, damage to the vacuum insulation panel 30 can be suppressed. Therefore, the assembly work of the insulation box 10 using the vacuum insulation panels 30 can be easily performed.

[0038] In addition, the gap between the first inclined surface 30c of the lower insulation plate 20b and the outer frame 12b becomes larger toward the top. Therefore, even if the side wall insulation plates 20c1-20c4 are inclined, the lower ends of the side wall insulation plates 20c1-20c4 can be easily inserted into this gap without hitting the lower insulation plate 20b. Therefore, the assembly work of the insulation box 10 using the vacuum insulation panel 30 can be easily performed. Furthermore, in the case of an insulation box 10 having a large size such as a container, even if the vacuum insulation panel 30 is easily tilted, the assembly workability of the insulation box 10 can be improved by suppressing damage to the vacuum insulation panel 30 due to corners.

[0039] In addition, in a state where the side wall insulation plates 20c1-20c4 are inclined so as to be inclined outward in the thickness direction toward the upper side, the inclination can be adjusted so that the side wall insulation plates 20c1-20c4 are parallel in the vertical direction while inserting the lower end portions of the side wall insulation plates 20c1-20c4 into the gap between the first inclined surface 30c of the lower insulation plate 20b and the outer frame 12b. In this way, by adjusting the inclination of the vacuum insulation panel 30 while inserting the lower end portion of the vacuum insulation panel 30, the workability of assembling the insulation box 10 can be improved.

[0040] The dimension h1 of the first chamfered surface 30d in the thickness direction satisfies the formula for the dimension H1 of the vacuum insulation panel 30 in the thickness direction: h1<(1-√2 / 2)H1. This dimension H1 is the dimension between the first inner surface 30a and the first outer surface 30b of the vacuum insulation panel 30 in the thickness direction. As a result, the dimension L1 between the outer end and the inner end of the first inclined surface 30c is larger than the dimension H1 of the vacuum insulation panel 30. Therefore, between the insulation space 10a surrounded by the vacuum insulation panel 30 and the outside, the dimension L1 of the heat transfer path 14, which is the gap between the opposing first inclined surfaces 30c, is longer than the dimension H1. Therefore, the heat transfer between the insulation space 10a and the outside via the heat transfer path 14 can be reduced, and the temperature change of the insulation space 10a can be reduced.

[0041] In addition, the first chamfered surface 30d can suppress contact between the first flanges 31 of adjacent vacuum insulation panels 30. That is, in the example of FIG. 3, the corner between the first outer surface 30b and the first inclined surface 30c of the vacuum insulation panel 30 is chamfered to form a first chamfered surface 30d between the first outer surface 30b and the first inclined surface 30c, and a first chamfered space 30e between the first chamfered surface 30d, the extended surface of the first outer surface 30b, and the extended surface of the first inclined surface 30c. In the lower heat insulation plate 20b, the first flange 31 protruding to the left from the first outer surface 30b is accommodated in the first chamfered space 30e. In the left heat insulation plate 20c3, the first flange 31 protruding downward from the first outer surface 30b is accommodated in the first chamfered space 30e. This allows the first flange 31 of the lower heat insulating plate 20b and the first flange 31 of the left heat insulating plate 20c3 to be opposed to each other, and allows the gap to be made as small as possible. Therefore, the dimension W of the heat transfer path 14 between the opposed first inclined surfaces 30c is kept small, reducing heat transfer through the heat transfer path 14 and reducing temperature changes in the heat insulating space 10a.

[0042] <Sealing material> As shown in FIG. 3, the insulation box 10 further includes a sealant 25 disposed between the first inclined surfaces 30c. The sealant 25 is, for example, made of a porous body, has a thin sheet shape, and is attached to the first inclined surfaces 30c with an adhesive or the like. A gap is provided between the first inclined surfaces 30c due to a dimensional error of the vacuum insulation panel 30 or an assembly error of the insulation plate 20. Even in such a case, the sealant 25 is interposed between the first inclined surfaces 30c, thereby reducing the flow of air in the heat transfer path 14, which is the gap. This suppresses heat transfer to the insulation space 10a due to the flow of air, and reduces the temperature change of the insulation space 10a.

[0043] The compression set of the sealing material 25 is 60% or less. The compression set is measured, for example, by the following compression set test using the sealing material 25 of FIG. 5A. The sealing material 25 has a thickness d1 of 10 mm and a size of 50 mm square in the orthogonal direction. As shown in FIG. 5B, the sealing material 25 is sandwiched and compressed between two aluminum compression plates B at 5° C. so that the thickness d2 becomes 1 mm. In this compressed state, the sealing material 25 is left in a thermostatic chamber maintained at an atmospheric temperature of 5° C. for 2 hours, 5 hours, 22 hours, 72 hours, and 220 hours. After this constant temperature test, as shown in FIG. 5C, the sealing material 25 is taken out from between the two compression plates B at 5° C., and after being released from the compressed state and left for 24 hours, the thickness d3 of the sealing material 25 is measured.

[0044] In many cases, the insulating box 10 is stored in a warehouse at 5° C., and opening and closing of the insulating box 10 is also performed in a warehouse at 5° C., so the compressive strain test of the sealing material 25 was performed at 5° C. However, the temperature for the compressive strain test of the sealing material 25 is not limited to this, and is determined according to the temperature range in which the sealing material 25 is used. For example, when the insulating box 10 is opened and closed at 20° C., the compressive strain test of the sealing material 25 may be performed at 20° C.

[0045] The compression set of the sealing material 25 after such a compression strain test is calculated by the following formula. In this formula, d1 is the thickness of the sealing material 25 before compression as shown in Fig. 5A, d2 is the thickness of the sealing material 25 in a compressed state before a constant temperature test as shown in Fig. 5B, and d3 is the thickness of the sealing material 25 after being released from the compressed state after a constant temperature test and left for 30 minutes as shown in Fig. 5C. In the above compression strain test, the thickness d1 is 10 mm and the thickness d2 is 1 mm, so the compression set of the sealing material 25 is calculated from the measured thickness d3. Compression set (%) = (d1-d3) / (d1-d2) x 100

[0046] Since the compression set calculated in this way is 60% or less, the sealant 25 can seal the gap between the first inclined surfaces 30c of the vacuum insulation panel 30. That is, for example, the design accuracy due to dimensional errors of the vacuum insulation panel 30 is ±1 mm from the design center value. Also, the assembly accuracy due to assembly errors of the insulation plate 20 is ±1 mm from the design center value. In this case, the design value of the gap between the first inclined surfaces 30c of the vacuum insulation panel 30 is 3 mm ±2 mm. As a result, the maximum value of the gap is 5 mm and the minimum value is 1 mm.

[0047] For example, when the gap between the first inclined surfaces 30c is the minimum value of 1 mm, the thickness d2 of the sealing material 25 placed in this gap in the most compressed state is 1 mm. Since the compression set of this sealing material 25 is 60% or less, the thickness d3 of the sealing material 25 after compression release is restored to a thickness of 5.4 mm or more. Since this thickness is greater than the maximum value of the gap, even if the first inclined surfaces 30c are next assembled with the gap between them at the maximum value of 5 mm, the sealing material 25 placed in this gap can seal the gap. This reduces the heat transfer to the heat insulating space 10a due to the flow of air through the heat transfer path 14, which is the gap, and reduces the temperature change in the heat insulating space 10a.

[0048] Moreover, the thickness d1 of the sealing material 25 is 10 mm or more because the sealing material 25 is used with a compression rate of 50% or more to ensure airtightness. The compression set of such a sealing material 25 is 60% or less, and more preferably 55.6% or less. Therefore, even in a gap of 1 mm or more and 5 mm or less, the compression rate of the sealing material 25 is 50% or more, so that the compressed sealing material 25 can ensure airtightness in the gap and seal the gap. This reduces heat transfer to the insulation space 10a due to the flow of air through the heat transfer path 14, which is the gap, and reduces temperature changes in the insulation space 10a.

[0049] In the above configuration, the maximum gap between the first inclined surfaces 30c is 5 mm, so the thickness of the sealant 25 is set to 10 mm or more, but the thickness of the sealant 25 is not limited to this. Furthermore, a sealant 25 having a thickness of 10 mm or more may be provided on only one of the opposing first inclined surfaces 30c. Furthermore, a sealant 25 having a thickness of 5 mm or more may be provided on both of the opposing first inclined surfaces 30c. In this case, two sealants 25 are provided in the gap between the opposing first inclined surfaces 30c, and the total thickness of the sealants 25 may be 10 mm or more.

[0050] Furthermore, the compression set of the sealant 25 is small, at 60% or less, and therefore the recovery rate of the sealant 25 is high. For example, in an insulation box 10 in which the insulation plate 20 is repeatedly assembled and disassembled, the dimension W of the gap between the opposing first inclined surfaces 30c changes each time the insulation box 10 is assembled. Even in cases in which there is variation in the dimension W of the gap, the sealant 25 recovers each time the insulation box 10 is disassembled, and therefore even the largest gap can be sealed.

[0051] The sealing material 25 has a compressive strength of 3 N / cm when compressed by 50%. 2 1, the upper heat insulating plate 20a is fixed to each of the front heat insulating plate 20c1 and the rear heat insulating plate 20c2 by locks 22. In this case, the compressive strength P of the sealing material 25 at 50% compression is expressed by the following formula, where F is the tensile load of the locks 22, n is the number of locks 22, X is the weight of the upper heat insulating plate 20a, and A is the contact area between the upper heat insulating plate 20a and the sealing material 25. P≦(F n+X 9.8) cos45° / A

[0052] For example, the tensile load F of the lock 22 is 1500 (N), the number n of the locks 22 is four, the weight X of the upper heat insulating plate 20a is 16.8 (kg), and the contact area A between the upper heat insulating plate 20a and the sealing material 25 is 1503 (cm 2 In this case, the compressive strength P of the sealing material 25 at 50% compression is 3 N / cm 2 More preferably, it is 2.9 (N / cm 2) or less. As a result, the compression rate of the sealant 25 becomes 50% or more, so that the sealant 25 can ensure airtightness in the gap and seal the gap. This reduces heat transfer to the heat insulating space 10a due to air flow in the heat transfer path 14, which is the gap, and reduces temperature changes in the heat insulating space 10a.

[0053] The sealing material 25 is made of foamed rubber, and more preferably, foamed ethylene propylene rubber. The foamed ethylene propylene rubber sealing material 25 has a compression set of 60% or less and a compression strength of 3N / cm at 50% compression. 2 As a result, the sealant 25 has a high recovery rate and is compressed by 50% or more in the gaps between the first inclined surfaces 30c. Therefore, even if there is variation in the dimensions of the gaps, the sealant 25 can seal the gaps, thereby reducing heat transfer to the thermally insulated space 10a due to air flow through the heat transfer paths 14 that are the gaps, and reducing temperature changes in the thermally insulated space 10a.

[0054] <Variation 1> As shown in Fig. 6A and Fig. 6B, the core material 33 of the vacuum insulation panel 30 may be formed of a plurality of core material parts 33c arranged in an orthogonal direction. In the core material 33 of the example of Fig. 6A, two core material parts 33c are arranged along one of the orthogonal directions (horizontal direction), and two core material parts 33c are arranged along the vertical direction perpendicular to the horizontal direction. In the core material 33 of the example of Fig. 6B, three core material parts 33c are arranged along the horizontal direction of the orthogonal direction, and two core material parts 33c are arranged along the vertical direction of the orthogonal direction. The larger the size of the core material parts 33c and the core material 33, the larger the warpage of these parts. Therefore, the warpage of the core material 33 formed of a plurality of small core material parts 33c is smaller than the warpage of one large core material 33, so that the warpage of the core material 33 can be reduced by forming the core material 33 from a plurality of core material parts 33c.

[0055] The core portion 33c in the example of Fig. 6A is formed by cutting one of a pair of sides extending in the horizontal direction and one of a pair of sides extending in the vertical direction in the base material 33d of one truncated pyramidal core portion 33c shown in Fig. 6C. Then, two core portions 33c are arranged in the horizontal and vertical directions so that the cut surfaces of the core portions 33c face each other, thereby forming the truncated pyramidal core portion 33.

[0056] Of the three core parts 33c arranged in the horizontal direction in the example of Fig. 6B, the central core part 33c2 is formed by cutting one of a pair of sides extending in the horizontal direction and both sides of a pair of sides extending in the vertical direction in a single truncated pyramidal base material 33d shown in Fig. 6D. Moreover, of the three core parts 33c, the two core parts 33c1 sandwiching the core part 33c2 between each other can be formed by cutting the base material 33d as shown in Fig. 6C, similar to the core part 33c in Fig. 6A. Here, of the core parts 33c arranged in the vertical direction, the size of one core part 33c is formed smaller than the other core part 33c. Three core portions 33c1, 33c2 are arranged horizontally and two core portions 33c1, 33c2 are arranged vertically so that the cut surfaces of the core portions 33c1, 33c2 face each other, thereby forming a core portion 33 having a truncated pyramid shape.

[0057] In this way, by adjusting the number and size of the core portions 33c, it is possible to form cores 33 of a plurality of shapes and sizes. Here, by forming a core 33 larger than the base material 33d using a plurality of core portions 33c smaller than the base material 33d, the size of the mold for the base material 33d is smaller than the size of the mold for the core 33, and the mold cost can be reduced. In addition, by forming a plurality of types of core portions 33c by cutting one type of base material 33d, the number of molds for the base material 33d is smaller than that in the case of forming a mold for each core portion 33c, and the mold cost can be reduced. In this way, the core 33 can be manufactured at low cost.

[0058] This core portion 33c is made of polyurethane foam with an open-cell structure. Polyurethane foam with an open-cell structure contains a number of air bubbles that are interconnected. The interconnection of these air bubbles allows air to be exhausted from the air bubbles of the core portion 33c contained within the exterior material 32. This increases the degree of vacuum within the exterior material 32, and improves the thermal insulation properties of the vacuum insulation panel 30.

[0059] In addition, since the open-cell polyurethane foam is a synthetic resin foam made porous by including air bubbles and is integrally formed, it is easier to cut than an aggregate of glass fiber, silica powder, etc. Therefore, the base material 33d made of the open-cell polyurethane foam can be easily cut to form the core portion 33c.

[0060] In the above configuration, one core material 33 housed in the covering material 32 is formed of a plurality of core material portions 33c. However, as in the example of Fig. 4, the core material 33 may have a first core material layer 33a and a second core material layer 33b laminated in the thickness direction. In this case, at least one of the first core material layer 33a and the second core material layer 33b may be formed of a plurality of core material portions 33c arranged in an orthogonal direction.

[0061] <Variation 2> As shown in FIG. 7, the vacuum insulation panel 30 may not have the first chamfered surface 30d (FIG. 3). In this case, the vacuum insulation panel 30 has a first inner surface 30a, a first outer surface 30b, and a first inclined surface 30c. The outer end of the first inclined surface 30c is connected to the outer peripheral edge of the first outer surface 30b, and the inner end of the first inclined surface 30c is connected to the outer peripheral edge of the first inner surface 30a. The first inclined surface 30c is inclined with respect to the thickness direction and the perpendicular direction, and the inclination angle θ with respect to the thickness direction is 45 degrees. When forming an insulation box 10 using an insulation plate 20 including this vacuum insulation panel 30, by facing the first inclined surfaces 30c of adjacent vacuum insulation panels 30, damage to the vacuum insulation panel 30 can be suppressed, and the insulation box 10 using the vacuum insulation panel 30 can be easily assembled.

[0062] Furthermore, the outer covering material 32 of the vacuum insulation panel 30 is formed by, for example, blow molding, and is not provided with a first flange 31. Therefore, even if the first chamfered surface 30d is not provided on the vacuum insulation panel 30, the first flanges 31 do not collide with each other in adjacent vacuum insulation panels 30, and the first inclined surfaces 30c can face each other. This vacuum insulation panel 30 has a longer heat transfer path 14 between the first inclined surfaces 30c than a vacuum insulation panel 30 provided with the first chamfered surface 30d, and therefore can further reduce heat transfer via the heat transfer path 14 and reduce temperature changes in the insulation space 10a.

[0063] <Embodiment 2> <Insulating box> As shown in Fig. 8 and Fig. 9, the heat insulation box 10 according to the second embodiment includes a plurality of (e.g., 10) heat storage panels 40 arranged in the heat insulation space 10a and used as a cold insulation material or a heat insulation material, and a heat transfer body 50 arranged on the bottom surface 10b of the heat insulation box 10. In the following, the heat storage panel 40 will be described as being used as a cold insulation material that maintains the temperature of the heat insulation space 10a at a temperature lower than a predetermined temperature such as the outside air temperature and room temperature (e.g., 23 degrees) of the heat insulation box 10, but it may also be used as a heat insulation material that maintains the temperature of the heat insulation space 10a at a temperature higher than the predetermined temperature. The heat storage panel 40 is frozen in a freezer to, for example, 5 degrees below the management temperature according to the management temperature of the goods such as medicines to be stored in the heat insulation box 10, and then arranged in the heat insulation space 10a.

[0064] The heat storage panel 40 is smaller than the vacuum insulation panel 30 of the insulation plate 20 forming the insulation box 10, and is disposed inside the vacuum insulation panel 30 in the thickness direction. The heat storage panel 40 has a second outer surface 40b which is an outer surface facing the first inner surface 30a of the vacuum insulation panel 30 of the insulation plate 20a in the insulation box 10. The multiple heat storage panels 40 include, for example, two upper heat storage panels 40, two front heat storage panels 40, two rear heat storage panels 40, two left heat storage panels 40, and two right heat storage panels 40.

[0065] The two upper heat storage panels 40 are arranged at intervals in the left-right direction, and the second outer surface 40b of the upper heat storage panel 40 faces and contacts the first inner surface 30a of the vacuum insulation panel 30 of the upper insulation plate 20a. The two front heat storage panels 40 are arranged at intervals in the left-right direction, and the second outer surface 40b of the front heat storage panel 40 faces and contacts the first inner surface 30a of the vacuum insulation panel 30 of the front insulation plate 20c1. The two rear heat storage panels 40 are arranged at intervals in the left-right direction, and the second outer surface 40b of the rear heat storage panel 40 faces and contacts the first inner surface 30a of the vacuum insulation panel 30 of the rear insulation plate 20c2. The two left heat storage panels 40 are arranged at intervals in the front-rear direction, and the second outer surface 40b of the left heat storage panel 40 faces and contacts the first inner surface 30a of the vacuum insulation panel 30 of the left insulation plate 20c3. The two right heat storage panels 40 are arranged at an interval in the front-to-rear direction, and the second outer surface 40b of the right heat storage panel 40 faces and contacts the first inner surface 30a of the vacuum insulation panel 30 of the right insulation board 20c4.

[0066] <Heat transfer material> The heat transfer body 50 is made of a material having a high thermal conductivity, such as a metal such as aluminum, or a resin. Among these, the heat transfer body 50 made of aluminum can reduce the weight of the heat transfer body 50 and provide good thermal conductivity. The aluminum may contain other metals, that is, the aluminum may also contain alloys thereof. The heat transfer body 50 has a frame body 51, a support portion 52, and a mounting plate 53. The frame body 51 is disposed on the first inner surface 30a of the lower insulating plate 20b forming the bottom surface 10b of the insulating box 10. The mounting plate 53 is a rectangular flat plate and is disposed on the frame body 51.

[0067] The frame 51 has a plurality of (two in the example of FIG. 8) first extensions 51a in the shape of a rectangular column extending in the left-right direction, and a plurality of (six in the example of FIG. 8) second extensions 51b in the shape of a rectangular column extending in the front-rear direction. The two first extensions 51a are arranged at intervals in the front-rear direction. The six second extensions 51b are arranged at intervals in the left-right direction between the two first extensions 51a. The ends of the second extensions 51b are connected to the first extensions 51a. As a result, the frame 51 has a space 51c surrounded by the first extensions 51a and the second extensions 51b, which reduces the weight and cost of the heat transfer body 50.

[0068] A plurality of support parts 52 are attached to the outer periphery of the frame body 51. The support parts 52 are flat, and two support parts 52 form a pair. For example, four pairs of support parts 52 are attached to the outer periphery of the first extension part 51a with a gap therebetween along the first extension part 51a. In addition, four pairs of support parts 52 are attached to the outer periphery of the second extension part 51b with a gap therebetween along the second extension part 51b that is disposed at the end of the six second extension parts 51b.

[0069] The support portion 52 is, for example, a right-angled triangular shape, and the dimension protruding from the frame body 51 increases toward the bottom. One adjacent side of the support portion 52 extends in the vertical direction and is attached to the outer periphery of the frame body 51, and the other adjacent side extends in the left-right direction or the front-rear direction and faces the bottom surface 10b of the heat insulation box 10. The oblique side 52a of the support portion 52 is inclined at 45 degrees with respect to the adjacent side, and is inclined inward in the thickness direction toward the top. The oblique side 52a of the support portion 52 faces the first inner surface 30a of the side wall insulation plates 20c1 to 20c4 that form the side surface 10c of the heat insulation box 10, and the distance between the oblique side 52a and the side surface 10c increases toward the top. The lower ends of the front heat storage panel 40, the rear heat storage panel 40, the left heat storage panel 40, and the right heat storage panel 40, whose second outer surfaces 40b face the side surface 10c of the heat insulation box 10, are inserted into this gap. This allows these heat storage panels 40 to be easily fixed to the insulating box 10.

[0070] The heat transfer body 50 is sandwiched between the front heat storage panel 40 and the rear heat storage panel 40 in the front-rear direction, and between the left heat storage panel 40 and the right heat storage panel 40 in the left-right direction. As a result, the two first extension parts 51a extend in the left-right direction, which is the thickness direction of the left heat storage panel 40 and the right heat storage panel 40, and are arranged at intervals in the front-rear direction, which is the perpendicular direction. The six second extension parts 51b extend in the front-rear direction, which is the thickness direction of the front heat storage panel 40 and the rear heat storage panel 40, and are arranged at intervals in the left-right direction, which is the perpendicular direction.

[0071] These heat storage panels 40 have a second outer surface 40b facing the side surface 10c of the insulation box 10, and a second inclined surface 40c inclined relative to the second outer surface 40b. When the lower end of the heat storage panel 40 is inserted into the gap between the side surface 10c of the insulation box 10 and the heat transfer body 50, the second inclined surface 40c of the heat storage panel 40 faces and contacts the oblique side 52a of the support part 52 of the heat transfer body 50. As a result, the heat storage panel 40 is supported by the support part 52 and pressed against the side surface 10c of the insulation box 10, and is therefore stably fixed to the heat transfer body 50 and the insulation box 10.

[0072] Moreover, the heat transfer body 50 is cooled by thermal conduction from the heat transfer body 50 to the heat storage panel 40. As a result, the insulating space 10a in which the heat storage panel 40 and the heat transfer body 50 are arranged is cooled by the heat storage panel 40 and the heat transfer body 50. Furthermore, in the heat transfer body 50, convection occurs in the space 51c surrounded by the first extension portion 51a and the second extension portion 51b in the frame body 51 cooled by the heat storage panel 40. Therefore, the mounting plate 53 covering the space 51c of the frame body 51 is uniformly cooled by the convection in the space 51c and the thermal conduction of the frame body 51.

[0073] Since the article is placed on the placement plate 53, the workability of storing the article in the heat-insulating box 10 is improved. That is, for example, when the heat storage panel 40 is frozen to -25°C by a refrigerator and then further temperature-regulated in a temperature-regulating cabinet at 5°C, it takes a long time, for example, 48 hours, for the heat storage panel 40 to reach 5°C by the freezing and temperature regulation. Also, when the heat storage panel 40 is left standing for a long time in a warehouse at 5°C, where freezing and temperature regulation are performed simultaneously, it takes an even longer time, for example, 120 hours, for the heat storage panel 40 to reach 5°C by the standing (freezing and temperature regulation). In contrast, the heat transfer body 50 is cooled by the heat storage panel 40. Therefore, the article may be placed on the placement plate 53 of the heat transfer body 50 after the heat storage panel 40 is frozen and temperature-regulated, or the article may be placed on the placement plate 53 while the heat storage panel 40 is being frozen and temperature-regulated. In this way, since the items can be stored in the insulating box 10 without waiting for the thermal storage panel 40 to freeze and adjust its temperature, the workability of storing the items in the insulating box 10 can be improved.

[0074] In the above configuration, the heat transfer body 50 is disposed on the bottom surface 10b of the heat insulation box 10, but instead of the heat transfer body 50, a heat storage panel 40 may be disposed on the bottom surface 10b of the heat insulation box 10. The heat storage panel 40 cools the heat insulation space 10a from below as well, making it possible to make the temperature of the heat insulation space 10a uniform.

[0075] <Heat storage panel> 10 and 11, the thermal storage panel 40 has a truncated pyramid shape such as a quadrangular pyramid shape, and has a second inner surface 40a, a second outer surface 40b, a second inclined surface 40c, and a second chamfered surface 40d. The second inner surface 40a is the first surface of the thermal storage panel 40, and the second outer surface 40b is the second surface of the thermal storage panel 40, which is a surface located opposite the first surface with the thermal storage pack 41 sandwiched therebetween in the thickness direction perpendicular to the first surface.

[0076] The second inner surface 40a and the second outer surface 40b are rectangular and perpendicular to the thickness direction. The area of ​​the second outer surface 40b is larger than the area of ​​the second inner surface 40a. The second outer surface 40b is the surface of the heat storage panel 40 opposite the second inner surface 40a in the thickness direction, and faces and contacts the first inner surface 30a of the vacuum insulation panel 30 in the insulation space 10a of the insulation box 10. When the heat storage panel 40 is arranged so that the second outer surface 40b faces the first inner surface 30a, the thickness direction of the heat storage panel 40 is parallel to and in the same direction as the thickness direction of the vacuum insulation panel 30.

[0077] The second chamfered surface 40d has its outer end connected to the outer peripheral edge of the second outer surface 40b, and extends inward in the thickness direction from the outer peripheral edge of the second outer surface 40b. The second flange 40e extends in a perpendicular direction from the outer peripheral edge of the second outer surface 40b. The second inclined surface 40c has its outer end connected to the inner end of the second chamfered surface 40d, and its inner end connected to the outer peripheral edge of the second inner surface 40a. The second inclined surface 40c is inclined with respect to the thickness direction and the perpendicular direction, and the inclination angle θ with respect to the thickness direction (FIG. 12B) is 45 degrees. Due to this second inclined surface 40c, the cross-sectional area of ​​the thermal storage panel 40 perpendicular to the thickness direction increases in the thickness direction from the second inner surface 40a to the second outer surface 40b.

[0078] In a state where the heat storage panels 40 are accommodated in the heat insulation space 10a of the heat insulation box 10, the second inclined surfaces 40c of the heat storage panels 40 adjacent to each other face each other. Here, the upper heat storage panel 40 is adjacent to each of the front heat storage panel 40, the rear heat storage panel 40, the left heat storage panel 40, and the right heat storage panel 40, and the second inclined surfaces 40c of these heat storage panels 40 face each other and the second inclined surface 40c of the upper heat storage panel 40. In addition, the front heat storage panel 40 is adjacent to each of the left heat storage panel 40 and the right heat storage panel 40, and the second inclined surfaces 40c of these heat storage panels 40 face each other and the second inclined surface 40c of the front heat storage panel 40. Furthermore, the rear heat storage panel 40 is adjacent to each of the left heat storage panel 40 and the right heat storage panel 40, and the second inclined surfaces 40c of these heat storage panels 40 face each other. These facing second inclined surfaces 40c come into contact with each other, and these heat storage panels 40 support each other and are fixed to the insulation box 10.

[0079] By having the second inclined surface 40c in this way, the angle between the second inner surface 40a and the second inclined surface 40c and the angle between the second inclined surface 40c and the second chamfered surface 40d are greater than 90 degrees. Therefore, even if the corner of one heat storage panel 40 hits the other heat storage panel 40 when assembling the heat storage panels 40 together, damage to the heat storage panel 40 can be suppressed.

[0080] As shown in Fig. 12B, the dimension h2 of the second chamfered surface 40d in the thickness direction may satisfy the formula for the dimension H2 of the thermal storage panel 40 in the thickness direction: h2<(1-√2 / 2)H2. This dimension H2 is the dimension between the second inner surface 40a and the second outer surface 40b of the thermal storage panel 40 in the thickness direction. As a result, the dimension L2 between the outer end and the inner end of the second inclined surface 40c becomes larger than the dimension H2 of the thermal storage panel 40. As a result, adjacent thermal storage panels 40 can stably support each other.

[0081] In addition, the second chamfered surface 40d can suppress contact between the second flanges 40e of adjacent thermal storage panels 40. That is, the corner between the second outer surface 40b and the second inclined surface 40c of the thermal storage panel 40 is chamfered to form a second chamfered surface 40d between the second outer surface 40b and the second inclined surface 40c, and a second chamfered space 40f between the second chamfered surface 40d, the extended surface of the second outer surface 40b, and the extended surface of the second inclined surface 40c. For example, as shown in FIG. 9 and FIG. 12B, in the upper thermal storage panel 40, the second flange 40e protruding leftward from the second outer surface 40b fits into the second chamfered space 40f. In addition, in the left thermal storage panel 40, the second flange 40e protruding upward from the second outer surface 40b fits into the second chamfered space 40f. As a result, the second flange 40e of the upper heat storage panel 40 does not come into contact with the second flange 40e of the left heat storage panel 40, and the second inclined surface 40c of the upper heat storage panel 40 comes into contact with the second inclined surface 40c of the left heat storage panel 40, allowing these heat storage panels 40 to be assembled.

[0082] 11, the heat storage panel 40 includes two heat storage packs 41 and a storage container 42 that stores the two heat storage packs 41. The number of heat storage packs 41 stored in the storage container 42 is not limited to two, and may be one, or three or more.

[0083] The heat storage pack 41 has a heat storage agent 41a and a filling bag 41b in which the heat storage agent 41a is filled. The heat storage agent 41a is in a gel state and contains a heat storage material such as paraffin, salt hydrate, an organic compound, water, or a combination of these. Since the heat storage agent 41a is in a gel state, leakage from the filling bag 41b can be suppressed.

[0084] The filling bag 41b is formed of a resin film, and the thickness of the film is thin, for example, 0.1 mm, and the film is flexible. The storage container 42 has a resin wall, and the thickness of the wall is thicker than the thickness of the filling bag 41b, for example, 2 mm or more and 3 mm or less, and the wall is rigid. Since the filling bag 41b is stored in the storage space, which is the internal space of the storage container 42, the filling bag 41b is protected by the wall of the storage container 42 that forms the storage space. Therefore, even if the filling bag 41b is thin, damage to the filling bag 41b is prevented, and leakage of the heat storage agent 41a from the filling bag 41b can be suppressed.

[0085] The wall of the container 42 has, for example, a second inner wall 42a and a second outer wall 42b. The second inner wall 42a has a truncated pyramid shape such as a quadrangular pyramid shape, and has a rectangular opening, a second inner wall flange portion 42a1 surrounding the periphery of the opening, and a second inner wall recessed portion 42a2 recessed inward in the thickness direction from the second inner wall flange portion 42a1. The second outer wall 42b has a rectangular flat plate shape, and has a second covering portion 42b1 covering the opening of the second inner wall 42a, and a second outer wall flange portion 42b2 surrounding the periphery of the second covering portion 42b1. The second outer wall flange portion 42b2 has the same shape and size as the second inner wall flange portion 42a1. The second inner wall 42a is formed by, for example, vacuum molding, so that the container 42 can be manufactured at low cost without using expensive molding dies such as blow molding and injection molding.

[0086] In such a storage container 42, the heat storage packs 41 are stored in the second inner wall recessed portion 42a2 through the opening of the second inner wall 42a. Here, when the storage container 42 has a dimension in one direction (vertical direction) larger than the dimension in the other direction (horizontal direction) of the orthogonal directions, for example, the two heat storage packs 41 are arranged vertically. Then, the opening of the second inner wall 42a is covered by the second covering portion 42b1 of the second outer wall 42b, and the second inner wall flange portion 42a1 and the second outer wall flange portion 42b2 are overlapped and heat-welded. The second flange 40e of the heat storage panel 40 is formed by the heat-welded second inner wall flange portion 42a1 and the second outer wall flange portion 42b2. Moreover, among the surfaces of the second inner wall recessed portion 42a2 of the second inner wall 42a, the surface opposite to the surface facing the second outer wall 42b in the thickness direction forms the second inner surface 40a, the second inclined surface 40c, and the second chamfered surface 40d of the heat storage panel 40. Moreover, among the surfaces of the second covering portion 42b1 of the second outer wall 42b, the surface opposite to the surface facing the second inner wall 42a in the thickness direction forms the second outer surface 40b of the heat storage panel 40.

[0087] The storage container 42 is provided with a plurality of first through holes 42c penetrating the second inner wall 42a, and a second through hole 42d penetrating the second outer wall 42b. The first through holes 42c and the second through holes 42d communicate the storage space surrounded by the walls of the storage container 42 with the outside of the storage container 42. Since the first through holes 42c are smaller than the second through holes 42d, the user's fingers or objects in the insulating box 10 are unlikely to hit the heat storage pack 41 in the storage container 42 through the first through holes 42c, and damage to the heat storage pack 41 can be suppressed.

[0088] As shown in Figs. 12A and 12B, a gap is provided as an air flow path 40i between the second inner wall 42a and / or the second outer wall 42b of the storage container 42 and the heat storage pack 41. The first through hole 42c communicates with this flow path 40i. Therefore, when the heat storage pack 41 is frozen by a refrigerator, the cold air passes through the first through hole 42c and the flow path 40i to reach the heat storage pack 41 and cools the heat storage pack 41. By contacting the cold air with the heat storage pack 41 in this way, the time required to freeze the heat storage pack 41 is shortened. Furthermore, since the thickness of the film of the filling bag 41b of the heat storage pack 41 is thinner than the second inner wall 42a and the second outer wall 42b of the storage container 42, the film of the filling bag 41b has better thermal conductivity than the second inner wall 42a and the second outer wall 42b of the storage container 42, and the time required to freeze the heat storage pack 41 is shortened.

[0089] After being frozen in the freezer, the heat storage pack 41 is subjected to temperature control in a temperature control cabinet. As with freezing, the time required for temperature control of the heat storage pack 41 can be shortened by providing the first through hole 42c and the flow path 40i in the storage container 42. In addition, when the heat storage pack 41 is left standing for a long time in a warehouse at 5°C, freezing and temperature control are performed simultaneously. If the storage container 42 does not have the first through hole 42c, it would take a long time, for example, 120 hours for the heat storage pack 41 to reach 5°C. However, by providing the storage container 42 with the first through hole 42c and the flow path 40i, the time can be significantly shortened to 48 hours.

[0090] Furthermore, the first through hole 42c is provided in the second inclined surface 40c. This makes it more difficult for a user's finger or an object to come into contact with the heat storage pack 41 in the storage container 42 through the first through hole 42c than if the first through hole 42c were provided in the second inner surface 40a. Therefore, even if the filling bag 41b of the heat storage pack 41 is thin, damage to the filling bag 41b is prevented, and leakage of the heat storage agent 41a from the filling bag 41b can be suppressed.

[0091] 11, a second through hole 42d is provided in the second outer surface 40b of the second outer wall 42b of the storage container 42. The second through hole 42d is disposed so as to face the center of the heat storage pack 41 in the orthogonal direction. Since the second through hole 42d penetrates the second outer wall 42b of the storage container 42, the frozen state of the heat storage pack 41 can be easily confirmed by viewing the heat storage pack 41 in the storage container 42 through the second through hole 42d.

[0092] Furthermore, since the second through hole 42d is larger than the first through hole 42c, the heat storage pack 41 can be easily seen through the second through hole 42d. Also, inside the insulation box 10, the second outer surface 40b on which the second through hole 42d is provided faces the second inner surface 40a of the insulation box 10, so that even if the second through hole 42d is large, the user's fingers, objects, etc. are unlikely to come into contact with the heat storage pack 41 through the second through hole 42d, and damage to the heat storage pack 41 can be suppressed.

[0093] As shown in FIG. 13, the heat storage panel 40 may not have the second chamfered surface 40d. In this case, the heat storage panel 40 has the second inner surface 40a, the second outer surface 40b, and the second inclined surface 40c. The outer end of the second inclined surface 40c is connected to the outer peripheral edge of the second outer surface 40b, and the inner end of the second inclined surface 40c is connected to the outer peripheral edge of the second inner surface 40a. In addition, the wall of the container 42 of the heat storage panel 40 is formed by, for example, blow molding, and the second flange 40e is not provided between the second inclined surface 40c and the second outer surface 40b. Therefore, even if the second chamfered surface 40d is not provided on the heat storage panel 40, when assembling such a heat storage panel 40, the second inclined surfaces 40c can be opposed to each other in the heat storage panels 40 adjacent to each other.

[0094] <Second recess> 11 and 12A, the second inner wall 42a of the storage container 42 is provided with a first recess 42f and a second recess 42g recessed outward in the thickness direction from the second inner surface 40a. In the thickness direction, the dimension D2 between the second inner surface 40a and the bottom of the second recess 42g is larger than the dimension D1 between the second inner surface 40a and the bottom of the first recess 42f. The second recess 42g is disposed in the center of the storage container 42 in the vertical direction and extends in the horizontal direction. This second recess 42g is used as a handle for the thermal storage panel 40, making it easy to carry the thermal storage panel 40.

[0095] Furthermore, since the two heat storage packs 41 are stored in the storage container 42 so as to sandwich the second recess 42g in the vertical direction, the second recess 42g suppresses movement and deformation of the heat storage pack 41. This suppresses deformation that would cause the heat storage pack 41 to become thicker, and prevents the freezing time of the heat storage pack 41 from becoming longer. Furthermore, the first through-hole 42c is prevented from being blocked by the heat storage pack 41 due to movement of the heat storage pack 41, and prevents the freezing time of the heat storage pack 41 from becoming longer.

[0096] Furthermore, as shown in FIG. 10, the second recess 42g is disposed in the center of the storage container 42 in the horizontal direction, and the dimension of the second recess 42g in the horizontal direction is smaller than the dimension of the storage container 42. Therefore, two air flow paths 40i are provided in the storage container 42 so as to sandwich the second recess 42g in the horizontal direction. The flow paths 40i are provided between the second inner wall 42a and the second outer wall 42b of the storage container 42, and between the second inner wall 42a and the heat storage pack 41. The flow paths 40i communicate the storage space of the first storage area 42h1, which is the area of ​​the storage container 42 on one side of the second recess 42g in the vertical direction, with the storage space of the second storage area 42h2, which is the area of ​​the storage container 42 on the other side of the second recess 42g. This allows cold air to flow smoothly into the storage space in the storage container 42, and shortens the time required to freeze the heat storage pack 41 in the storage container 42.

[0097] <First recess> 12A, the heat storage pack 41 sandwiched between the second inner wall 42a and the second outer wall 42b of the storage container 42 in the thickness direction is pressed toward the second outer wall 42b by the first recess 42f recessed from the second inner surface 40a of the second inner wall 42a, suppressing the movement and deformation of the heat storage pack 41. This suppresses the heat storage pack 41 from becoming thicker due to deformation of the heat storage pack 41, and suppresses the extension of the freezing time of the heat storage pack 41. In addition, the first through hole 42c is suppressed from being blocked by the heat storage pack 41 due to the movement of the heat storage pack 41, and suppresses the extension of the freezing time of the heat storage pack 41.

[0098] 10, each of the first storage area 42h1 and the second storage area 42h2 of the storage container 42 has a central area 42e1, a first outer peripheral area 42e2 surrounding the periphery of the central area 42e1, and a second outer peripheral area 42e3 surrounding the periphery of the first outer peripheral area 42e2. The central area 42e1 includes the central positions of the storage areas 42h1 and 42h2 in the perpendicular direction and has a circular shape. The second inner wall 42a of the central area 42e1 faces the center of the heat storage pack 41, and the first recess 42f is not provided in the second inner wall 42a of the central area 42e1, and an air flow path 40i is provided between the second inner wall 42a of the central area 42e1 and the heat storage pack 41. The center of the heat storage pack 41 is more difficult to freeze, but the cold air flowing through the flow passages 40i in the central region 42e1 corresponding to the center of the heat storage pack 41 shortens the time required for freezing the heat storage pack 41.

[0099] The second outer circumferential region 42e3 is disposed between the first outer circumferential region 42e2 and the second inclined surface 40c in the perpendicular direction. The second inner wall 42a of the second outer circumferential region 42e3 does not have the first recess 42f, and an air flow path 40i is provided between the second inner wall 42a of the second outer circumferential region 42e3 and the heat storage pack 41. The air flow path 40i extends along the second inclined surface 40c around the entire circumference of the storage container 42. The first through holes 42c are provided in the second inclined surface 40c, spaced apart from each other along the inner end of the second inclined surface 40c, and communicate with the air flow path 40i of the second outer circumferential region 42e3. As a result, the cold air flows from the first through hole 42c into the flow path 40i of the second outer peripheral region 42e3, and then flows through this flow path 40i around the entire circumference of the storage container 42, thereby shortening the time required to freeze the heat storage pack 41 in the storage container 42.

[0100] The first outer circumferential region 42e2 is annular and has a plurality of first recesses 42f (six in the example of FIG. 10). The six first recesses 42f extend radially from the central region 42e1 toward the second outer circumferential region 42e3. Between the adjacent first recesses 42f, an air flow path 40i is provided between the second inner wall 42a of the first outer circumferential region 42e2 and the heat storage pack 41. The flow path 40i of the first outer circumferential region 42e2 communicates with the flow path 40i of the central region 42e1 and communicates with the first through-hole 42c via the flow path 40i of the second outer circumferential region 42e3. As a result, cold air flows from the first through hole 42c into the flow path 40i of the second outer peripheral region 42e3, passes through the flow path 40i of the first outer peripheral region 42e2, and then flows into the flow path 40i of the central region 42e1, thereby shortening the time required to freeze the center of the heat storage pack 41, which is difficult to freeze.

[0101] <Judgment mark> As shown in FIG. 14A, the heat storage panel 40 is provided with a judgment mark 43 for judging the frozen state of the heat storage agent 41a. The judgment mark 43 is provided on the filling bag 41b on the inside in the thickness direction of the heat storage agent 41a in the overlapping region 42d1, which is a region overlapping with the second through hole 42d when viewed along the thickness direction of the heat storage panel 40. The judgment mark 43 is, for example, an image printed on the filling bag 41b, a tape attached to the filling bag 41b, or the like, and has a color with good visibility, such as black. In addition, the filling bag 41b is transparent or translucent. The transparency of the heat storage agent 41a changes depending on the frozen state. For example, when the heat storage agent 41a is not frozen, it is transparent or translucent, and as the heat storage agent 41a freezes, its transparency decreases, and when the heat storage agent 41a freezes, it becomes opaque, such as white.

[0102] The heat storage agent 41a is disposed between the determination mark 43 and the second through hole 42d in the thickness direction. Therefore, as shown in FIG. 14B, when the heat storage agent 41a is not frozen, the determination mark 43 can be seen from the second through hole 42d through the heat storage agent 41a. In contrast, when the heat storage agent 41a is frozen, as shown in FIG. 14C, it is difficult or impossible to see the determination mark 43 from the second through hole 42d through the heat storage agent 41a. Due to the visibility of the determination mark 43, it is easy to determine whether the heat storage agent 41a is frozen or not. Therefore, it is possible to prevent the heat storage agent 41a from being accommodated in the heat insulation space 10a in an unfrozen state, and to prevent the heat insulation space 10a from being kept cold by the heat storage agent 41a from becoming shorter than a predetermined time.

[0103] As shown in FIG. 14A, the determination mark 43 is provided in a part (half in the example of FIG. 14B) of the overlapping region 42d1, and its color is different from the color of the wall of the storage container 42. Therefore, when the heat storage agent 41a is not frozen, the determination mark 43 and the storage container 42 can be seen through the heat storage agent 41a from the second through hole 42d. Due to the contrast in color between the determination mark 43 and the storage container 42, it is easier to determine the decrease in visibility of the determination mark 43 due to the decrease in transparency of the heat storage agent 41a when the determination mark 43 is provided in a part of the overlapping region 42d1 than when the determination mark 43 is provided in the entire overlapping region 42d1. Therefore, it is easy to determine whether the heat storage agent 41a has frozen based on this determination result.

[0104] The position of the determination mark 43 is not limited to the filling bag 41b, as long as it is visible through the heat storage agent 41a from the second through hole 42d. For example, as shown in Fig. 14D, the determination mark 43 may be provided on the surface of the second inner wall 42a of the storage container 42 facing the heat storage pack 41, in an overlapping region 42d1 that overlaps with the second through hole 42d when viewed along the thickness direction. In this case, too, since the heat storage agent 41a is disposed between the determination mark 43 and the second through hole 42d in the thickness direction, it is possible to easily determine whether or not the heat storage agent 41a has frozen based on the visibility of the determination mark 43.

[0105] In addition, all the above-mentioned embodiments may be combined with each other as long as they do not exclude each other. In addition, many improvements and other embodiments of the present disclosure will be apparent to those skilled in the art from the above description. Therefore, the above description should be construed as an example only, and is provided for the purpose of teaching those skilled in the art the best mode for carrying out the present disclosure. The details of the structure and / or function may be substantially changed without departing from the spirit of the present disclosure.

[0106] <Additional Notes> The above description of the embodiment and modifications discloses the following techniques. Technique 1 is an insulation box comprising a plurality of vacuum insulation panels and an insulation space surrounded by the plurality of vacuum insulation panels, wherein the vacuum insulation panels have a first inner surface forming the insulation space, a first outer surface which is the surface opposite the first inner surface in a thickness direction perpendicular to the first inner surface, and a first inclined surface which is inclined with respect to the thickness direction so that the cross-sectional area of ​​the vacuum insulation panel perpendicular to the thickness direction increases from the first inner surface to the first outer surface, and the first inclined surfaces of adjacent vacuum insulation panels face each other.

[0107] With this configuration, for example, the distance between the first inclined surface of one of the adjacent vacuum insulation panels and the frame becomes larger the higher up. Therefore, even if the other vacuum insulation panel is inclined, the lower end of the other vacuum insulation panel can be easily inserted into the gap without hitting the first vacuum insulation panel. This makes it possible to easily assemble the insulation box by aligning the first inclined surfaces of adjacent vacuum insulation panels opposite each other.

[0108] In addition, the heat transfer path, which is the gap between the first inclined surfaces, can be made longer than the thickness of the vacuum insulation panel. Because this heat transfer path is provided between the insulated space and its outside, heat transfer between the insulated space and its outside via the heat transfer path can be reduced, and temperature changes in the insulated space can be reduced.

[0109] A second technology is an insulation box as described in Technology 1, wherein the vacuum insulation panel further has a first chamfered surface provided between the first inclined surface and the first outer surface, and a dimension h1 of the first chamfered surface in the thickness direction satisfies the equation: h1<(1-√2 / 2)H1 for the dimension H1 of the vacuum insulation panel in the thickness direction.

[0110] According to this configuration, the first chamfered surface makes the corners of the vacuum insulation panel gentler, reducing damage to the vacuum insulation panel caused by the corners hitting something else, which makes it easier to assemble the insulation box using the vacuum insulation panels.

[0111] Furthermore, by forming the vacuum insulation panel so that the dimension h1 of the first chamfered surface satisfies the above formula, the heat transfer path between the first inclined surfaces can be made longer than the thickness of the vacuum insulation panel. Since this heat transfer path is provided between the insulated space and its outside, it is possible to reduce heat transfer between the insulated space and its outside via the heat transfer path, thereby reducing temperature changes in the insulated space.

[0112] Furthermore, for example, the envelope material of the vacuum insulation panel is formed by heat welding two vacuum-formed members. In this case, even if the flange, which is the heat-welded portion, protrudes from the first outer surface, the flange fits into the chamfered space surrounded by the extended surface of the first outer surface, the extended surface of the first inclined surface, and the first chamfered surface. Therefore, the flanges of adjacent vacuum insulation panels do not come into contact with each other, and the first inclined surfaces can be made to face each other. In this way, the envelope material of the vacuum insulation panel can be formed by vacuum forming at a lower cost than blow molding, injection molding, or the like.

[0113] Technique 3 is the insulation box according to Technique 1 or 2, further comprising a sealant disposed between the opposing first inclined surfaces. With this configuration, even if a gap is formed between the first inclined surfaces due to variations in size of the vacuum insulation panels or dimensional tolerances during assembly of the insulation box, the gap is sealed by the sealant. This makes it possible to prevent cold air in the insulation space from leaking to the outside through the gap, and reduce temperature changes in the insulation space.

[0114] Technique 4 is the insulation box according to Technique 3, in which the compression set of the sealing material is 60% or less. With this configuration, even if the insulation box is repeatedly assembled and disassembled, the sealing material compressed between the first inclined surfaces of the insulation box recovers, so that the sealing material seals the gaps between the first inclined surfaces and can reduce temperature changes in the insulation space.

[0115] In technique 5, the sealing material has a compressive strength of 3N / cm when compressed by 50%. 2 According to this configuration, for example, the insulation box can be locked to provide a resistance of 3N / cm 2When the compressive strength of the sealing material is applied to the sealing material, the sealing material is compressed to 50% or less. By compressing the sealing material in this manner, the sealing material seals the gaps between the first inclined surfaces, and can reduce temperature changes in the thermally insulated space.

[0116] Technique 6 is the heat-insulating box according to any one of techniques 3 to 5, wherein the sealing material is made of foamed ethylene propylene rubber. According to this configuration, the sealing material made of foamed ethylene propylene rubber has a compression set of 60% or less and a compressive strength of 3 N / cm at 50% compression. 2 The following compressive strength is possible: This allows the sealing material to seal the gaps between the first inclined surfaces and reduce temperature changes in the heat-insulating space.

[0117] Technique 7 is the insulation box according to any one of Techniques 1 to 6, in which the vacuum insulation panel includes an outer covering material and a core material that is housed in the outer covering material and includes a plurality of core material portions arranged in a direction perpendicular to the thickness direction within the outer covering material. With this configuration, the larger the core material is, the greater the warping of the core material becomes, but by forming the core material from a plurality of core material portions, it is possible to reduce warping of the core material.

[0118] Technique 8 is the insulating box according to technique 7, in which the core portion includes an open-cell polyurethane foam. With this configuration, a core portion of a desired size can be easily formed by cutting a base material of the open-cell polyurethane foam. Furthermore, a core of a desired size and shape can be formed by combining the core portions.

[0119] Technique 9 is an insulating box according to any one of Techniques 1 to 8, further comprising a heat transfer body arranged on the bottom surface of the insulating box, and a heat storage panel having an end inserted between a side surface of the insulating box and the heat transfer body.

[0120] According to this configuration, the heat storage panel can be easily fixed to the heat insulation box by inserting the end of the heat storage panel between the side surface of the heat insulation box and the heat transfer body. Also, for example, the heat transfer body comes into contact with the heat storage panel and is cooled by the heat storage panel, so that the heat transfer body and the heat storage panel can uniformly cool the insulated space.

[0121] Technique 10 is the insulation box according to Technique 9, in which the heat transfer body has a frame including a plurality of extension parts extending in an extension direction along the bottom surface of the insulation box and arranged at intervals in a direction perpendicular to the extension direction, and a mounting plate arranged on the frame. With this configuration, in addition to the thermal conduction of the extension parts, the mounting plate and the insulation space can be uniformly cooled by air convection in the space between the adjacent extension parts.

[0122] Technology 11 is an insulating box according to Technology 9 or 10, in which the heat storage panel has a second outer surface facing the first inner surface and a second inclined surface inclined relative to the second outer surface, and the heat transfer body has a support portion including a hypotenuse facing the second inclined surface.

[0123] According to this configuration, the second inclined surface of the heat storage panel faces the oblique side of the support part, so that the heat storage panel is supported by the support part and pressed against the side surface of the insulating box, thereby stably fixing the heat storage panel to the support part of the heat transfer body and the insulating box.

[0124] Technology 12 is the insulation box according to any one of Technology 1 to 11, further comprising a heat storage panel arranged in the insulation space, the heat storage panel comprising a heat storage pack in a filling bag made of a film filled with a heat storage agent, and a storage container for storing the heat storage pack, the storage container having a wall that is thicker than the thickness of the film and forms a space for storing the heat storage pack, an air flow path is provided between the wall and the heat storage pack, and a first through hole is provided in the wall to communicate the flow path with the outside of the storage container.

[0125] According to this configuration, the storage container has a thick wall and is rigid, and the heat storage pack in the storage container is protected from external forces, thereby suppressing damage to the heat storage pack. Also, the heat storage agent in the thin filling bag is cooled by cold air flowing into the air flow path in the storage container through the first through hole provided in the wall of the storage container, thereby shortening the time required to freeze the heat storage pack.

[0126] Technology 13 is an insulating box according to Technology 12, in which the heat storage panel has a second outer surface facing the first inner surface, a second inner surface which is a surface located opposite the second outer surface in the thickness direction across the heat storage pack, and a second inclined surface which is inclined with respect to the thickness direction so that a cross-sectional area of ​​the heat storage panel perpendicular to the thickness direction increases from the second inner surface to the second outer surface, and the first through hole is provided in the second inclined surface.

[0127] According to this configuration, since the first through-hole is provided on the second inclined surface, the user's finger or objects in the insulated box are prevented from contacting the heat storage pack through the first through-hole, compared to when the first through-hole is provided on the second inner surface. This makes it possible to prevent damage to the heat storage pack. Furthermore, since the first through-hole is provided on the second inclined surface, cold air flows into the storage container through the first through-hole more easily than when the first through-hole is provided on the second outer surface, and the time required for the cold air to freeze the heat storage pack in the storage container is shortened.

[0128] Technology 14 is an insulating box as described in Technology 13, in which the storage container has a central region corresponding to the center of the heat storage pack in a direction perpendicular to the thickness direction, an outer peripheral region surrounding the central region, and a plurality of recesses recessed from the second inner surface in the outer peripheral region, and air flow paths between adjacent recesses are connected to the first through hole and the air flow path between the wall of the central region and the heat storage pack.

[0129] According to this configuration, the heat storage packs in the storage container are pressed by the recesses of the storage container, suppressing deformation and movement of the heat storage packs. This prevents the heat storage packs from becoming thicker and the first through holes from being blocked by the heat storage packs, thereby suppressing an increase in the time required to freeze the heat storage packs. In addition, the heat storage packs spread more widely, making the cooling effect of the heat storage packs more uniform.

[0130] Technique 15 further includes a heat storage panel disposed in the insulating space, the heat storage panel comprising: The insulated box according to any one of techniques 1 to 14 includes a heat storage pack in which a heat storage agent is filled in a filling bag, a determination mark for determining whether the heat storage agent is frozen, and a storage container having a thickness greater than a thickness of the filling bag and for storing the heat storage pack, the storage container having a second through hole arranged to sandwich the heat storage agent between the determination mark in the thickness direction, and the heat storage pack being less transparent when the heat storage agent is in a frozen state than when it is not frozen.

[0131] According to this configuration, the heat storage agent is disposed between the second through hole and the determination mark in the thickness direction. As the heat storage agent freezes, its transparency decreases, making it difficult to see the determination mark. The frozen state of the heat storage agent can be easily determined by the visibility of the determination mark.

[0132] Technique 16 is an insulating box according to technique 15, in which the determination mark is provided in a portion of the area that overlaps with the second through hole when viewed along the thickness direction in the storage container or the filling bag.

[0133] According to this configuration, when the heat storage agent is not frozen, the determination mark and the wall of the storage container are visible through the heat storage agent from the second through hole, and the determination mark is easy to distinguish due to the contrast between the color of the determination mark and the color of the wall of the storage container. As a result, as the heat storage agent freezes, the determination mark becomes invisible or difficult to see, making it easy to determine the frozen state of the heat storage agent. [Explanation of symbols]

[0134] 10: Insulated box 10a: Insulated space 10b: Bottom 10c: Side 25: Encapsulating material 30: Vacuum insulation panel 30a: First inner surface 30b: 1st outer surface 30c: 1st slope 30d: First chamfered surface 32: Outer cover material 33: Core material 33c: Core material part 40: Heat storage panel 40a: Second inner surface 40b: 2nd outer surface 40c: 2nd slope 40i: Air flow path 41: Heat storage pack 41a: Heat storage material 41b: Filling bag 42: Containment Container 42c: 1st through hole 42d: Second through hole 42d1 :Area 42e1 :Central area 42e2: First outer area (outer area) 42f: First recess (recess) 43: Judgement mark 50: Heat transfer material 51:Frame body 51a: First stretching part (stretching part) 51b: Second stretching part (stretching part) 52: Support part 52a: hypotenuse 53: Loading plate

Claims

1. A plurality of vacuum insulation panels and a thermal insulation space surrounded by the plurality of vacuum insulation panels; The vacuum insulation panel is A first inner surface that defines the thermal insulation space; a first outer surface that is a surface opposite to the first inner surface in a thickness direction perpendicular to the first inner surface; A first inclined surface inclined with respect to the thickness direction so that a cross-sectional area of ​​the vacuum insulation panel perpendicular to the thickness direction increases from the first inner surface to the first outer surface, The first inclined surfaces of the adjacent vacuum insulation panels face each other. Insulated box.

2. The vacuum insulation panel further includes a first chamfered surface provided between the first inclined surface and the first outer surface, The dimension h1 of the first chamfered surface in the thickness direction satisfies the formula for the dimension H1 of the vacuum insulation panel in the thickness direction: h1 < (1-√2 / 2) H1, The insulating box according to claim 1.

3. Further comprising a sealant disposed between the opposing first inclined surfaces. The insulating box according to claim 1.

4. The compression set of the encapsulant is 60% or less.

4. The insulating box according to claim 3.

5. The sealing material has a compressive strength of 3 N / cm when compressed by 50%. ２ Below is the 4. The insulating box according to claim 3.

6. The sealing material is made of foamed ethylene propylene rubber.

4. The insulating box according to claim 3.

7. The vacuum insulation panel is An outer covering material; A core material is housed in the outer covering material and includes a plurality of core material portions arranged in a direction perpendicular to the thickness direction within the outer covering material. The insulating box according to claim 1.

8. The core portion includes an open-cell polyurethane foam.

8. The insulating box according to claim 7.

9. A heat transfer body disposed on a bottom surface of the insulating box; Further comprising a heat storage panel, the end of which is inserted between the side surface of the insulating box and the heat transfer body. The insulating box according to claim 1.

10. The heat transfer body is A frame body including a plurality of extension portions extending in an extension direction along a bottom surface of the insulation box and arranged at intervals in a direction perpendicular to the extension direction; A mounting plate disposed on the frame body, 10. The insulating box according to claim 9.

11. The heat storage panel is a second outer surface opposite the first inner surface; a second inclined surface inclined relative to the second outer surface, The heat transfer body has a support portion including a hypotenuse facing the second inclined surface.

10. The insulating box according to claim 9.

12. Further comprising a heat storage panel disposed in the heat insulating space, The heat storage panel is A heat storage pack in which a heat storage agent is filled in a filling bag made of a film; A container for accommodating the heat storage pack, The storage container has a wall having a thickness greater than a thickness of the film and forming a space for storing the heat storage pack, an air flow path is provided between the wall and the heat storage pack, and a first through hole is provided in the wall to communicate the air flow path with the outside of the storage container. The insulating box according to claim 1.

13. The heat storage panel is a second outer surface opposite the first inner surface; a second inner surface that is a surface located opposite the second outer surface with the heat storage pack interposed therebetween in the thickness direction; A second inclined surface inclined with respect to the thickness direction so that a cross-sectional area of ​​the thermal storage panel perpendicular to the thickness direction increases from the second inner surface to the second outer surface, The first through hole is provided in the second inclined surface.

13. The insulating box according to claim 12.

14. The container comprises: a central region corresponding to a center of the heat storage pack in a direction perpendicular to the thickness direction; An outer peripheral region surrounding the central region; a plurality of recesses recessed from the second inner surface in the outer circumferential region; an air flow path between the adjacent recesses communicates with the first through hole and an air flow path between the wall of the central region and the heat storage pack; 14. The insulating box according to claim 13.

15. Further comprising a heat storage panel disposed in the heat insulating space, The heat storage panel is A heat storage pack in which a heat storage agent is filled in a filling bag; A determination mark for determining whether the heat storage agent is frozen; a container having a thickness greater than the thickness of the filling bag and configured to accommodate the heat storage pack; the container has a second through-hole disposed between the container and the determination mark in the thickness direction so as to sandwich the heat storage agent therebetween, The heat storage pack has a lower transparency when the heat storage agent is in a frozen state than when the heat storage agent is not frozen. The insulating box according to claim 1.

16. The determination mark is provided in a portion of an area overlapping with the second through hole when viewed along the thickness direction of the storage container or the filling bag.

16. The insulating box according to claim 15.

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