WO2014141839A1

WO2014141839A1 - Collapsible cold storage box

Info

Publication number: WO2014141839A1
Application number: PCT/JP2014/053967
Authority: WO
Inventors: 田中　幹彦; 純子栗原; 太根　将博
Original assignee: 積水化成品工業株式会社
Priority date: 2013-03-13
Filing date: 2014-02-20
Publication date: 2014-09-18
Also published as: TW201502032A

Abstract

Provided is a collapsible cold storage box having improved cold storage performance. A collapsible cold storage box (A) is provided with: a top frame (10); a bottom plate (23); a bottom frame (20); a pair of first side walls (30) which each have an upper side or a lower side connected through a hinge to either the top frame (10) or the bottom frame (20); a pair of foldable and erectable second side walls (40) which each have an upper side connected through a hinge to the top frame and which also each have a lower side connected through a hinge to the bottom frame; and a lid body (60). The second side walls (40) are each provided with: an upper zone portion (40A) and a lower zone portion (40B), which are arranged vertically next to each other; and a folding portion (40C) which connects the upper and lower zone portions (40A, 40B). The bottom plate (23), the first side walls (30), the upper zone portions (40A) and the lower zone portions (40B), the upper and lower zone portions (40A, 40B) constituting the second side walls (40), and the lid body (60) have portions facing a cold storage space (R) defined by at least the bottom plate (23), the first side walls (30), the upper zone portions (40A), the lower zone portions (40B), and the lid body (60), and the portions have hollow sections (23b, 31b, 40b, 60b) therein.

Description

Folding cold box

The present invention relates to a folding cold box used to store, store, or transport various articles.

Folding boxes are widely used because the volume can be reduced in the absence of containment and the transportation cost and storage cost when not in use can be reduced. It is described in. The folding box described in Patent Document 1 is a folding box made of synthetic resin, and the top sides of a pair of first side walls that regulate the height are hinged to two opposite sides of the top frame. The other two opposite sides are hinged to the upper sides of a pair of second side walls that are foldable by hinges at the middle, and the lower sides of the second side walls are hinged to the two opposite sides of the bottom frame, respectively. It is a connected form.

In the folding box, using the side wall that can be folded by hinge connection at the middle part, such as the above-mentioned second side wall, makes the structure of the middle hinge part complicated, and the middle hinge part is damaged by repeated use. It was easy to occur. Moreover, when using as a cold storage container, it cannot avoid that cold air leaks from the clearance gap formed in the said intermediate hinge part of a 2nd side wall, It was necessary to pay sufficient attention to temperature control.

In the folding container described in Patent Document 2, the member corresponding to the second side wall is a bending in which the upper partition portion and the lower partition portion, which are arranged in parallel in the vertical direction, and the upper partition portion and the lower partition portion are connected. It consists of parts. And the thickness of a bending part is made thinner than the thickness of an upper division part and a lower division part. The second side wall of this form can be integrally molded, and durability can be improved by selecting a material. In addition, since a gap that acts as a ventilation path is not formed in the bent portion, heat insulation performance is improved as compared with a side wall provided with a hinge connecting portion in the middle. Furthermore, the upper partition part and the lower partition part have a hollow part, and from this, the heat insulation performance is improved.

Japanese Patent Laid-Open No. 9-188333 JP 2008-155983 A

The second side wall in the folding box of the form described in Patent Document 1 is the second side wall of the form described in Patent Document 2, that is, the upper partition part and the lower partition part arranged in parallel in the vertical direction, and the above By replacing with a side wall composed of a bent portion that connects the upper compartment portion and the lower compartment portion, there is a possibility that a folding box having improved durability and improved heat insulation may be obtained. However, in the folding box described in the above-mentioned patent document, the hermeticity and cold insulation performance of the container have not been studied.

In recent years, there have been widespread delivery systems in which food vendors who have received orders from households store the ordered foods in cold storage containers and deliver them individually to each household. For example, a refrigerated container that stores refrigerated and frozen products can be kept refrigerated by suppressing the temperature rise in the container even if it is temporarily kept at the front door of each household at relatively high temperatures such as in summer.・ It is necessary to prevent the frozen product from being damaged.

In such a case, the use of a foamed resin cold storage container can effectively suppress the temperature rise in the container, but it is relatively large in order to accommodate relatively large items such as refrigerated and frozen products. A cold storage container is required. In such a case, there is an increasing demand for a foldable cold box that can be folded compactly after taking out a product and that has the necessary cold performance.

Also, for example, folding containers that contain products such as beverages and food delivered to retail stores such as convenience stores are unloaded at each store, and then the products are displayed on refrigerated shelves and freezer shelves. May be temporarily kept in the store. In such a foldable container, conventionally, the cooling performance has not been sufficiently studied. For this reason, there is a need for a folded cold box that can cool the product more effectively, such as temporarily holding it after delivery.

The present invention has been made in view of the circumstances as described above, and includes an upper partition portion, a lower partition portion, and a bent portion that connects the upper partition portion and the lower partition portion on some side walls. It is an object of the present invention to provide a folding cold box with improved cooling performance in a folding box using side walls of different shapes.

The folding cold insulation box according to the present invention includes a top frame, a bottom plate and a bottom frame, a pair of first side walls hinged to either the top frame or the bottom frame, and a top frame with the top side being the bottom frame. A folding cool box having a pair of bent and standing second side walls hinged to the lower side, and a lid, wherein the second side wall includes an upper partition portion and a lower partition which are arranged in parallel in the vertical direction. At least a bent portion connecting the upper partition portion and the lower partition portion, the bottom plate, the first side wall, the upper partition portion and the lower partition portion constituting the second side wall, and All of the lids, or at least the upper partition portion and the lower partition portion constituting the first side wall and the second side wall, of at least a portion facing the cold insulation space defined by them. Hollow inside Characterized in that it has.

In the folding cold box according to the present invention, the second side wall has a bent portion. The upper partition portion is hinged to the top frame, and the lower partition portion is hinged to the bottom frame so that the lower partition portion can be turned inside the folding cold box. Therefore, when folding the cold insulation box, the upper side wall and the lower side wall part of the second side wall are rotated by rotating the first side wall so that the top and bottom frames are close to each other. Are turned so that each of them falls down, and the bent portion between the upper compartment portion and the lower compartment portion is bent. As a result, the second side wall is bent and the upper compartment portion and the lower compartment portion are folded to fold the folding cool box.

In the folding cool box having such a configuration, the bottom plate, the first side wall, the upper and lower partition portions of the second side wall, and the lid body define a cool space. And all or the upper partition part and the lower partition part constituting at least the first side wall and the second side wall of at least the inside of the part facing the cold insulation space defined by them. Has a hollow portion. The air in the hollow part in the member having the hollow part has a heat insulating effect against heat transmitted from the outside to the cold-reserving space through the member. Therefore, in the form in which all of the above-mentioned members that close the top, bottom, front, and left and right sides of the cold insulation space are provided with hollow portions in the portions facing the cold insulation space, compared to the case where only some side walls are provided with hollow portions The heat insulation performance of the folding cold box can be improved. Further, by connecting the upper partition portion and the lower partition portion of the second side wall by the bent portion, a gap that acts as an air passage is not formed between the upper partition portion and the lower partition portion. Therefore, the airtightness of the cold insulation space of the folding cold insulation box is improved, and the cold insulation performance of the folding cold insulation box can be further improved by a synergistic effect with the heat insulating effect of the hollow portion included in each member.

Even in a form in which three members of the upper partition portion and the lower partition portion constituting at least the first side wall and the second side wall of the members include a hollow portion in a portion facing the cold insulation space, By using a member that does not have a hollow portion (that is, either or both of the bottom plate and the lid) as a heat insulating material, the heat insulating performance of the folded cold box can be improved as required.

In the folding cold box, at least one of the bottom plate, the first side wall, the upper and lower partition portions constituting the second side wall, and the lid body having the hollow portion. The thickness of the part having the hollow part is preferably 5 mm or more and 50 mm or less, and the thickness of the wall member defining the hollow part is preferably 0.5 mm or more and 5 mm or less. In this way, for example, fresh food such as vegetables delivered to each home and refrigerated / frozen processed foods, beverages delivered to retail stores, and refrigerated / frozen products such as ice and processed foods, Sufficient cooling performance can be demonstrated.

In the folding cold box, the bottom plate, the first side wall, the upper partition portion and the lower partition portion constituting the second side wall, and the lid body having the hollow portion It is preferable that a reinforcing recess is formed in the wall member that defines at least one of the hollow portions. Thereby, when an external force acts on the wall member defining the hollow portion, the wall member can be supported by the reinforcing concave portion to prevent deformation. Further, the bending strength of the wall member can be improved by the reinforcing recess. Therefore, providing each of the members with reinforcing recesses as necessary prevents the members from being deformed by being dented by an external force, thereby improving the durability of the folding cold box.

Further, in the above-described folding cold box, it is preferable that a stepped portion for supporting an end portion of the regenerator material is formed on the inner side surface of the top frame. Thereby, the cool storage material can be stably supported on the inner side of the top frame above the folding cool box and disposed above the cool storage space, and the air in the cool storage space can be cooled by the cool storage material. Therefore, the cold performance of the folding cold box can be further improved.

Further, in the above-described folding cool box, the bent portion is preferably thinner than the upper compartment portion and the lower compartment portion so as to be easily folded. In this case, the second side wall fills a space formed on the side of the bent portion because the thickness of the bent portion is smaller than the thickness of the upper partition portion and the lower partition portion when standing upright. A spacer may be provided. Thus, when a load from above acts on the second side wall, the load is received by the spacer. Thereby, it can avoid that a bending part deform | transforms carelessly and can prevent that a 2nd side wall deform | transforms. Further, the area where the bent portion comes into contact with the outside air can be reduced by the presence of the spacer, and the heat insulation performance is also improved. As a result, a folded cold box having improved durability and high heat insulation can be obtained.

Moreover, in the above-mentioned folding cold box, it is preferable that the hollow portion is filled with a heat insulating material. By filling the hollow portion with the heat insulating material, the heat insulating performance of the folding cold box can be further improved as compared with the case where the hollow portion is hollow.

Further, in the above-described folding cool box, the bottom plate, the first side wall, the upper partition portion and the lower partition portion constituting the second side wall, and the lid body having the hollow portion It is preferable that the thickness is 10 mm or more and 100 mm or less, and the wall member that defines the hollow portion has a thickness of 0.5 mm or more and 5 mm or less. Thereby, it becomes possible to make the heat | fever permeability of a folding cold box into 3.0 W / m < ² > K or less, and can obtain suitable performance as a highly insulated container.

Moreover, in the above-mentioned folding cold box, the heat insulating material is preferably a foamed resin such as a polyurethane resin. Thereby, while filling the hollow part with the heat insulating material easily, suitable performance as a highly heat-insulated container can be obtained.

Further, in the above-described folding cold box, the wall member is preferably made of a polyolefin resin. Thereby, sufficient intensity | strength and durability of a wall member are securable. In particular, when a folding cold box is used in a low temperature environment of 0 ° C. or lower, sufficient strength and durability can be maintained by configuring the wall member with a polyethylene resin.

According to the present invention, it is possible to provide a folded cold box with improved cold performance.

The perspective view which shows the state which each side wall stood in one Embodiment of the folding cool box by this invention. The top view of the folding cool box shown in FIG. The bottom view of the folding cool box shown in FIG. Sectional drawing which follows the III-III line | wire of FIG. Sectional drawing which follows the IV-IV line of FIG. The figure which shows the folding middle of the folding cool box shown in FIG. The figure which shows after the folding of the folding cool box shown in FIG. The perspective view which shows the 1st side wall of the folding cool box shown in FIG. The front view which shows the state which the 2nd side wall of the folding cool box shown in FIG. 1 stood up. The side view which shows the state which the 2nd side wall of the folding cool box shown in FIG. 1 stood up. The figure corresponded in FIG. 4 in other embodiment of the folding cool box by this invention. The figure which shows the other form of the bottom frame used with the folding cool box by this invention. The perspective view of the bottom frame shown in FIG. The figure corresponded in FIG. 4 in other embodiment of the folding cool box by this invention. Sectional drawing which expanded the XII part shown in FIG. The graph which shows the relationship between the temperature of the water in the folding cool box by the Example of this invention, and elapsed time.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The illustrated folding cool box A has a rectangular shape in plan view, the top frame 10 and the bottom frame 20, the bottom plate 23, the pair of

first side walls

30, 30 that form a rectangular shape, the pair of

second side walls

40, 40, and It is comprised with the cover body 60. FIG. Each member constituting the folding cold box A defines a cold space R inside the folding cold box A by the lid 60 closing the opening 13 inside the top frame 10. Among the above members, each member except the top frame 10 and the bottom frame 20 has a hollow portion inside the portion facing the cold insulation space R. Hereafter, each member which comprises the folding cool box A is demonstrated in detail.

The top frame 10 is composed of opposed short side frames 11, 11 and opposed long side frames 12, 12, and the top surface is an opening 13 that can be sealed by a lid 60. An appropriate number of pairs (two pairs in the illustrated example) of first hinge convex pieces 14 are integrally formed in the vicinity of the upper end on the inner side of each short side frame 11 shown in FIG. An appropriate number (three in the illustrated example) of second hinge convex pieces 15 are integrally formed at a position near the lower end inside the side frame 12.

Steps

12 a and 12 a that support both ends of the regenerator C are formed above the second hinge convex piece 15 and in the middle in the vertical direction of the inner surfaces of the long side frames 12 and 12 of the top frame 10. Has been. The

step portions

12a, 12a are formed in steps so as to protrude from the inside of the opposed long side frames 12, 12 to the inside of the cold insulation box A. As shown in FIG. 2A, the

step portions

12 a and 12 a support the cold storage material C on the inside of the top frame 10 by supporting both ends of the plate-shaped cold storage material C having a rectangular shape in plan view from below. It is formed to be able to. Further, the step portion 12 a is formed over the entire width of the inner side surfaces of the long side frames 12, 12 of the top frame 10, and three cold storage materials C can be arranged side by side along the long side frame 12. Two ribs 12b for partitioning the three cold storage materials C are provided on the stepped portion 12a so as to protrude with an interval corresponding to the width of the cold storage material C. When the regenerator material C is arranged side by side on the stepped portion 12a, the rib 12b contacts the side surface of the end portion in the longitudinal direction of each regenerator material C to prevent the regenerator material C from moving in the width direction. Preferably, the top frame 10 is molded by an injection molding method using a resin such as a polyolefin-based resin.

The bottom frame 20 has the same dimensions as the top frame 10, and also has short side frames 21, 21 that face each other and long side frames 22, 22 that face each other. It is closed by a bottom plate 22 a formed integrally with the longitudinal frame 22. In the example shown in FIG. 4, a convex portion 24 is integrally formed at a substantially central portion inside each short-side frame 21. In addition, a bulging portion 25 is formed on the long side frame 22 so as to extend substantially inward. The second hinge formed inside the long side frame 12 of the top frame 10 in the bulging portion 25. A recess 26 for receiving a hinge convex piece 43 formed at the lower end of the lower partition portion 40B of the second side wall 40 to be described later is formed at a location facing the convex piece 15 for use. Preferably, the bottom frame 20 is integrally molded by an injection molding method using a resin such as a polyolefin resin.

The bottom plate 23 is a hollow material formed by using a resin such as a polyolefin-based resin so as to have a hollow portion 23b inside the wall member 23a as shown in FIG. 3 by a blow molding method (or an insert blow molding method). is there. The hollow portion 23b is formed inside the portion of the bottom plate 23 that faces the cold insulation space R. In this example, the hollow portion 23b is formed over the entire region of the bottom plate 23 facing the cold insulation space R, except for a region where a reinforcing recess D described later is formed. The bottom plate 23 is fitted inside the bottom frame 20, and is fixed to the bottom frame 20 by the convex portion 20 a of the bottom frame 20 being engaged with the concave portion 23 c formed on the peripheral edge portion thereof, thereby closing the bottom surface of the bottom frame 20. It is arranged on the bottom plate 22a. The thickness T1 of the portion having the hollow portion 23b of the bottom plate 23 is preferably 5 mm or more and 50 mm or less. The wall thickness of the inner and

outer wall members

23a and 23a defining the hollow portion 23b of the bottom plate 23 is preferably 0.5 mm or more and 5 mm or less.

The bottom plate 23 has a plurality of reinforcing recesses D formed in the wall member 23a. In the example shown in FIG. 2B, a total of seven reinforcing recesses D are formed, one at the center of the bottom surface of the bottom plate 23 and three along the long side frames 22 and 22 of the bottom frame 20. As shown in FIG. 3, the reinforcing recess D is formed by sinking a wall member 23 a on the bottom surface side of the bottom plate 23, that is, on the outer side of the folding cold box A. The reinforcing recess D has a cylindrical inner wall Da extending between the wall member 23a on the upper surface side and the wall member 23a on the bottom surface side of the bottom plate 23 perpendicularly thereto. In this example, the wall member 23a on the upper surface side of the bottom plate 23, that is, the inner side of the folding cool box A, is positioned below the upper end of the inner surface of the short side frame 21 and the long side frame 22, and The cushion material is filled.

As shown in FIG. 6, the first side wall 30 includes a side wall body 31 and two sets of hinge convex pieces 32 integrally formed on the upper end surface thereof by insert molding. The side wall body 31 is a hollow material formed by using a resin such as a polyolefin-based resin so as to have a hollow portion 31b inside the wall member 31a shown in FIG. 4 by a blow molding method (or an insert blow molding method). . The hollow portion 31b is formed inside a portion of the side wall body 31 that faces the cold insulation space R. In this example, the hollow portion 31b is formed over the entire region of the side wall main body 31 facing the cold insulation space R except for a region where a reinforcing recess D described later is formed. It is preferable that thickness T2 of the part which has the hollow part 31b of the side wall main body 31 is 5 mm or more and 50 mm or less. The wall thickness of the inner and

outer wall members

31a and 31a defining the hollow portion 31b of the side wall body 31 is preferably 0.5 mm or more and 5 mm or less.

The wall member 31 a of the side wall body 31 is formed with a plurality of reinforcing recesses D similar to the bottom plate 23. In the example shown in FIG. 6, two reinforcing recesses D of the side wall main body 31 are formed side by side in the central portion in the height H1 direction with a gap in the lateral width W1 direction. The lateral width W 1 of the side wall main body 31 is substantially equal to the distance between the insides of the long side frames 12, 12 facing the top frame 10 (the distance between the insides of the long side frames 22, 22 of the bottom frame 20 facing each other). The height H 1 is ½ of the distance between the short side frames 11, 11 of the top frame 10 facing each other (the distance between the short side frames 21, 21 of the bottom frame 20 facing each other). In the range which does not exceed, it sets suitably according to the height which the folding cool box A to obtain is required.

The two pairs of hinge

convex pieces

32, 32 of the first side wall 30 are formed at positions corresponding to the first hinge

convex pieces

14, 14 formed inside the short side frame 11 of the top frame 10. Each of the hinge convex pieces 32 is fitted (or fitted) between the first hinge convex pieces 14 as shown in the figure. A recessed portion 33 (see FIG. 4) is formed at the lower end portion of the side wall main body 31 at a position facing the convex portion 24 formed inside the short side frame 21 of the bottom frame 20. The hinge convex piece 32 is preferably a non-foamed molded product of a resin such as polyolefin resin.

The hinge

convex pieces

32, 32 formed on the upper end surface of the first side wall 30 are internally fitted to the first hinge

convex pieces

14, 14 formed on the inner side of the short side frame 11 of the top frame 10 (or 1), the first side wall 30 is hingedly connected to the short side frame 11 side of the top frame 10, and as shown by the phantom line in FIG. The hinge connecting portion can be used as a fulcrum and can be turned in the range of 90 degrees inside the cold insulation box A. In the vertical posture, the lower end surface of the bottom frame 20 is brought into contact with the bottom frame 20, and the convex portion 24 formed inside the short side frame 21 of the bottom frame 20 enters the recessed portion 33 formed in the lower end. It becomes. As a result, the first side wall 30 regulates the height of the folding cold box A and stabilizes the standing posture. At the time of folding, as shown in FIG. 5B, the first side wall 30 is accommodated in the upper region of the

side walls

11, 12 of the top frame 10 by turning upward to the horizontal posture inside the folding cool box A. Note that the second hinge convex piece 15 formed on the inner side of the longitudinal side wall 12 of the top frame 10 is more than the first side wall 30 in a state where the first side wall 30 is housed in the top frame 10 in a horizontal posture. Is also formed at a lower position.

Next, the second side wall 40 will be described. As shown in FIGS. 7A and 7B, the second side wall 40 has a rectangular shape in side view as a whole, and includes an upper partition portion 40A and a lower partition portion 40B arranged in parallel in the vertical direction, and the upper partition portion 40A and the lower portion. It is formed by a bent portion 40C connecting the partition portion 40B. The upper partition portion 40A and the lower partition portion 40B have the same dimensions, and both are rectangular in a side view. The upper partition portion 40A and the lower partition portion 40B are formed so as to have a hollow portion 40b inside the wall member 40a shown in FIG. 3 by a blow molding method (or insert blow molding method) using a resin such as polyolefin resin. is doing. The hollow portion 40b is formed inside a portion of the upper partition portion 40A (lower partition portion 40B) that faces the cold insulation space R. In this example, the hollow portion 40b is formed over the entire region of the upper partition portion 40A (lower partition portion 40B) facing the cold insulation space R, except for the formation region of the reinforcing recess D described later. The thickness T3 of the portion having the hollow portion 40b of the upper partition portion 40A (lower partition portion 40B) is preferably 5 mm or more and 50 mm or less. The wall thickness of the inner and

outer wall members

40a, 40a defining the hollow portion 40b of the upper partition portion 40A (lower partition portion 40B) is preferably 0.5 mm or more and 5 mm or less.

Further, in the upper partition portion 40A and the lower partition portion 40B, a plurality of reinforcing recesses D are formed in the wall member 40a similarly to the bottom plate 23. At the time of molding, the bent portion 40C is integrally molded at a position displaced to one side in the thickness direction of the upper partition portion 40A and the lower partition portion 40B. The thickness of the bent portion 40C is made thinner than the thickness of the upper partition portion 40A and the lower partition portion 40B so that the bending is easy.

Three sets of hinge convex pieces 42 are integrally formed on the upper end surface of the upper partition portion 40A by insert molding, and three sets of hinge convex pieces 43 are integrally formed on the lower end surface of the lower partition portion 40B by insert molding. Has been. The hinge

convex pieces

42 and 43 are preferably non-foamed molded products of a resin such as polyolefin resin.

The lateral width W2 of the second side wall 40 is the distance between the short side frames 11, 11 facing the top frame 10 (the distance between the short side frames 21, 21 facing the bottom frame 20). Is almost equal to As shown in FIG. 7A, the height H2 of the second side wall 40 is such that when the first side wall 30 is in a standing posture, the hinge convex piece 42 formed on the upper end surface of the upper partition portion 40A is Located in the position of the second hinge convex piece 15 formed on the top frame 10 and in the recess 26 formed by the hinge convex piece 43 formed on the lower end surface of the lower partition portion 40B on the bottom frame 20 It is said to be a height that can take an intrusive posture. Then, the pin P is inserted into the hinge convex piece 42 and the second hinge convex piece 15 for hinge connection, and the pin P is inserted between the hinge convex piece 43 and the side wall of the recess 26. As a result of the hinge connection, the second side wall 40 is hinged to the top frame 10 on the upper end side and the bottom frame 20 on the lower end side, and the distance between the top frame 10 and the bottom frame 20 is increased. Correspondingly, the bent portion 40C has a bent posture with the inside.

In the second side wall 40, since the thickness of the bent portion 40C is thinner than the thickness of the upper partition portion 40A and the lower partition portion 40B, the side of the bent portion 40C has a required depth when standing up as shown in FIG. 7B. A space S is formed. In order to fill the space S, the second side wall 40 is provided with a spacer 50. The thickness in the vertical direction of the spacer 50 is substantially equal to the height in the vertical direction of the space S when the second side wall 40 is in the standing posture, and the horizontal width of the spacer 50 is substantially equal to the horizontal width of the space S. In the example shown in FIG. 7A, the spacer 50 is composed of two divided

spacers

50A and 50A whose horizontal width is half of the horizontal width of the space S. A single spacer may cover the entire width of the space S, or two or more divided spacers 50A may cover the entire width of the space S. Preferably, the spacer 50 is a non-foamed molded product of a resin such as a polyolefin-based resin, and is an integrally molded product by injection.

As shown in FIG. 7A, the split spacer 50A includes a rod-shaped main body portion 51 and a locking portion 52 that rises from two locations of the main body portion 51. The height of the main body 51 is approximately equal to the height of the space S, and the lateral width is approximately ½ of the space S. The width in the front-rear direction of the main body portion 51 is substantially equal to the depth of the space S, that is, the distance from the front surface of the upper partition portion 40A (lower partition portion 40B) to the bent portion 40C described above. Further, four concave portions 45 are formed in the front surface portion on the lower end side of the upper partition portion 40A, and the locking portions 52 of the divided spacers 50A enter the concave portions 45, respectively. The thickness of the locking portion of the divided spacer 50A in the front-rear direction is substantially the same as the depth of the recessed portion 45, and the height thereof is substantially equal to the height of the recessed portion 45. The split spacer 50A is fixed to the upper partition portion 40A by the locking portion 52 being locked by an appropriate locking structure 46 of the recessed portion 45.

As shown in FIGS. 5A and 5B, the upper partition portion 40A can be freely bent to an angle of 180 degrees with respect to the lower partition portion 40B using the bent portion 40C in a state where the spacer 50 is fixed. Is possible. Further, as shown in FIGS. 7A and 7B, when the upper partition portion 40A and the lower partition portion 40B are in a vertically rising posture, the spacer 50 causes a gap between the upper partition portion 40A and the lower partition portion 40B, that is, Since the thickness of the bent portion 40C is thinner than the thickness of the upper partition portion 40A and the lower partition portion 40B, the space S formed on the side of the bent portion 40C is filled almost without any gaps.

As shown in FIGS. 3 and 4, the lid body 60 is formed using a resin such as polyolefin resin so as to have a hollow portion 60b inside the wall member 60a by a blow molding method (or an insert blow molding method). Hollow material. The hollow portion 60b is formed inside the portion of the lid 60 that faces the cold insulation space R. In this example, the hollow portion 60b is formed over the entire region of the lid body 60 facing the cold insulation space R, except for a region where a reinforcing recess D described later is formed. It is preferable that thickness T4 of the part which has the hollow part 60b of the cover body 60 is 5 mm or more and 50 mm or less. The wall thickness of the inner and

outer wall members

60a and 60a defining the hollow portion 60b of the lid 60 is preferably 0.5 mm or more and 5 mm or less.

The wall member 60 a of the lid body 60 is formed with a reinforcing recess D similar to the bottom plate 23. In the example shown in FIG. 1, a total of seven reinforcing recesses D are formed, one at the center of the bottom surface of the lid body 60 and three along the longitudinal side surface, like the bottom plate 23. As shown in FIGS. 3 and 4, a stepped portion 62 is formed on the peripheral edge of the bottom surface side of the lid 60. The lid body 60 is formed with a protrusion 61 that fits in the opening 13 of the top frame 10 on the bottom surface side by reducing the thickness T4 at the step portion 62. The folding cool box A is hermetically sealed by fitting the convex portion 61 of the lid 60 into the opening 13 of the top frame 10.

Next, the posture during use and folding of the folding cool box A according to the present invention will be described. 3 and 4 show a state in use. In this state, the pair of

first side walls

30, 30 rises vertically with the hinge connecting portion on the

short side frame

11, 11 side of the top frame 10 as a fulcrum, and the lower end thereof is the short side of the bottom frame 20. The bottoms of the side frames 21 and 21 are reached. The pair of

second side walls

40, 40 are hinge-connected at the upper end side to the hinge connecting portion on the long-

side frame

12, 12 side of the top frame 10, and the lower end side is on the long-

side frame

22, 22 side of the bottom frame 20. Standing vertically with the hinge connected to the hinge connecting part. The posture of the second side wall 40 in this state is shown in FIG. The user accommodates an appropriate article in the folding cold box A in this posture, hangs the regenerator material C on the step 12a on the inner side of the top frame 10, and places the convex portion 61 of the lid 60 on the top frame 10. It is fitted inside the opening and hermetically sealed to be used for storage or transportation of articles.

For example, when a refrigerated / frozen product is stored in the cold storage space R of the cold storage box A and delivered to each home at a distribution center of a food dealer, the cold storage box A is temporarily stored at the entrance of the home of the delivery destination. May be retained. Further, when refrigerated / frozen products are accommodated in the folding cool box A and delivered to the retail store, the folding cool box A after the goods are unloaded at each store and displayed on the refrigerated shelf or the freezer shelf. May be temporarily kept in the store. In such a case, it is necessary to prevent the refrigerated / frozen product from being damaged by suppressing the temperature rise in the folding cool box A even in summer when the temperature is relatively high.

When only a part of the side walls of each member that closes the top, bottom, front, back, left and right is configured with a hollow material having a hollow portion like a conventional folding box, the bottom plate, the side wall, and the outside heat does not have a hollow portion, It is easily transmitted to the inside of the folding box through the lid, and the temperature inside the folding box easily rises. In addition, in a folding box having a side wall in which the upper partition part and the lower partition part are hingedly connected, the cold air inside the folding box leaks from the gap formed in the intermediate hinge part, or high temperature outside air enters. The temperature inside the folding box easily rises.

On the other hand, the folding cool box A of the present embodiment has a bottom plate 23 that closes the top, bottom, front, back, left and right of the inside cool space R, the top side wall 31 of the first side wall 30, and the top of the second side wall 40. All of the partition portion 40A, the lower partition portion 40B, and the lid 60 have

hollow portions

23b, 31b, 40b, 60b inside the portion facing the cold insulation space R. Thereby, the heat transfer from the outside to the cold insulation space R in the folding cold insulation box A can be effectively suppressed by the

hollow portions

23b, 31b, 40b, 60b of the respective members. Further, since the gap 40C of the second side wall 40 is not formed with a gap that acts as an air passage, the airtightness of the folding cool box A is improved, and the folding is performed by a synergistic effect with the heat insulating effect of the hollow material. The cold performance of the cold box A can be further improved.

Furthermore, about at least 1 among the baseplate 23, the side wall main body 31, the upper division part 40A, the lower division part 40B, and the cover body 60, thickness of the part which has the

hollow parts

23b, 31b, 40b, 60b shall be 5 mm or more and 50 mm or less And by setting the

wall members

23a, 31a, 40a, 60a that define the

hollow portions

23b, 31b, 40b, 60b to have a wall thickness of 0.5 mm or more and 5 mm or less, the thermal conductivity of the folded cool box A can be set, for example, The range may be 2.0 W / m ² K or more and 9.0 W / m ² K or less.

Here, the heat transmissivity Hc (W / m ² K) can be obtained, for example, as follows. A predetermined amount of water (1 ° C.) contained in a container is accommodated in the cold insulation space R of the folding cold insulation box A in which the area S (m ² ) of the outer surface has been measured in advance, and left in a predetermined external temperature environment for a predetermined time. The temperature change of the water in the cold insulation space R is measured. And the energy E (kcal) which invaded the folding cool box A, the difference T (K) between the outside temperature and the average temperature of water, and the measurement time Hr (h) are obtained. At this time, the heat transmissivity Hc (W / m ² K) is obtained by the following equation (1).

Hc = E / (S × T × Hr) (1)

By making the thermal conductivity Hc of the folding cold box A within a range of, for example, 2.0 W / m ² K or more and 9.0 W / m ² K or less, the heat insulation performance of the folding cold box A is used for the above-mentioned food delivery applications. It can be set to a suitable level. Furthermore, about all the said members, said foodstuffs by making thickness of the part which has

hollow part

23b, 31b, 40b, 60b and wall thickness of each

wall member

23a, 31a, 40a, 60a into said range. Folding cold box A having a heat insulation performance more suitable for delivery applications such as the above can be obtained.

Moreover, the thickness of the part which has the

hollow part

23b, 31b, 40b, 60b of the bottom plate 23, the side wall main body 31 of the 1st side wall 30, the upper partition part 40A and the lower partition part 40B of the 2nd side wall 40, and the cover body 60. If the thickness is less than 5 mm, the intended cold insulation performance may not be obtained. On the other hand, if it is thicker than 50 mm, the internal volume of the folding cold box A may be reduced or the volume after folding may be increased. Further, if the

wall members

23a, 31a, 40a, and 60a of each of the above members are thinner than 0.5 mm, sufficient strength may not be obtained. On the other hand, if they are thicker than 5 mm, the weight may increase. . Therefore, each member has a

hollow portion

23b, 31b, 40b, 60b having a thickness of 5 mm or more and 50 mm or less, and the

wall members

23a, 31a, 40a, 60a have a thickness of 0.5 mm or more and 5 mm or less. Is preferred. Thereby, the strength and dimensions of the bottom plate 23, the side wall body 31 of the first side wall 30, the upper partition portion 40A and the lower partition portion 40B of the second side wall 40, and the lid body 60 are set within an appropriate range. it can.

Further, in the folding cold box A of the present embodiment, the wall member 23a that defines the bottom plate 23, the side wall body 31, the upper partition portion 40A, the lower partition portion 40B, and the

hollow portions

23b, 31b, 40b, 60b of the lid body 60. , 31a, 40a, and 60a are provided with reinforcing recesses D. For example, the reinforcing recess D of the bottom plate 23 shown in FIG. 3 has a cylindrical inner wall Da extending vertically between the upper and

lower wall members

23a, 23a. Therefore, when a load is applied to the upper surface side of the bottom plate 23, the upper wall member 23 a is supported from below by the inner wall Da of the reinforcing recess D. Therefore, the upper wall member 23a is prevented from bending downward. Also in the other members described above, the

wall members

31a, 40a, 60a are similarly supported by the inner wall Da of the reinforcing recess D, so that dents and deformations due to the external force of the

wall members

31a, 40a, 60a are suppressed.

Moreover, in the folding cool box A of the present embodiment, a step portion 12 a that supports the end portion of the cold storage material C is formed on the inner surface of the top frame 10. Thereby, the cool storage material C can be stably supported inside the top frame 10 above the folding cool box A, and the cool storage material C can be arranged above the cool storage space R. Therefore, the air in the sealed cold insulation space R can be cooled by the cold storage material C, and the cold insulation performance of the folded cold insulation box A can be further improved.

Moreover, in the folding cool box A of the present embodiment, when the second side wall 40 is in an upright posture as shown in FIGS. 3 and 4, the upper partition portion 40 A and the lower partition that constitute the second side wall 40. The portion 40B is connected by a bent portion 40C without any air passage. Furthermore, as shown in FIG. 7B, the space S between the lower end of the upper partition portion 40A formed by the bent portion 40C and the upper end of the lower partition portion 40B is formed by a spacer 50 attached to the lower end of the upper partition portion 40A. Almost all areas are filled. Therefore, the hermeticity of the cold insulation space R is improved as compared with the side wall to which the conventional intermediate portion is hinged, and the heat insulating performance of the second side wall 40 can be improved. Furthermore, when a large load is applied from above, the load can be received by the spacer 50, so that the second side wall 40 can be prevented from being unnecessarily deformed.

After use, fold the cold storage box A to reduce the storage space. FIG. 5A shows a state in the middle of folding. First, the pair of

first side walls

30, 30 are rotated about the hinge connecting portion of the top frame 10 as a fulcrum, and the folding cold box A is in a horizontal position. Jump up. In parallel with the flip-up operation, the middle part of the pair of

second side walls

40, 40 is folded and pushed toward the inside of the cold insulation box A. This state is shown in FIG. 5A. As the second side wall 40 bends, the upper partition portion 40A and the lower partition portion 40B rotate so as to fall inside the cold insulation box A, and the top frame 10 and the bottom frame 20 gradually approach the distance. Finally, the state shown in FIG. 5B is obtained. In this state, the upper partition portion 40A and the lower partition portion 40B of the second side wall 40 are folded, and the

first side walls

30 and 30 are on the folded upper partition portion 40A. The volume of the folding cold box A is smaller than that in use.

As described above, according to the present embodiment, in the folding box using the side wall 40 having the upper partition portion 40A, the lower partition portion 40B, and the bent portion 40C connecting them, the cold insulation performance is further improved. An improved folding cold box A can be provided. Therefore, for example, when the refrigerated / frozen product is accommodated and delivered to each home, or when a product such as a beverage or food is accommodated and delivered to a retail store, the folding cold box A is placed in a place where the temperature is relatively high. Even in the case of being temporarily retained, it is possible to keep the refrigerated / frozen product from being damaged by suppressing the temperature rise of the cold-reserved space R in the folded cold-reservoir box A. Further, even a relatively large folding cold box A that can accommodate relatively large items such as refrigerated / frozen products can be stored compactly by folding it after use to reduce the occupied space.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. These are included in the present invention.

For example, the reinforcing concave portion D is not necessarily formed on all of the bottom plate 23, the side wall body 31, the upper partition portion 40A, the lower partition portion 40B, and the lid body 60. What is necessary is just to form suitably the number required for reinforcement in the member which needs reinforcement according to the thickness of each said member, the area of the area | region which faces the cold insulation space R, the wall thickness of

wall member

23a, 31a, 40a, 60a, etc. Further, the reinforcing concave portion D may be provided on one or both of the inner and

outer wall members

23a, 31a, 40a, and 60a of the folding cool box A. Further, it is not necessary to provide the reinforcing recesses D in all the above members. In this case, the heat insulation performance of each member is further improved.

In addition, a reinforcing recess D is formed in the side wall body 31 of the first side wall 30, the upper and

lower partition portions

40A and 40B of the second side wall 40, and the

wall members

23a, 31a, 40a, and 60a of the lid body 60. At this time, a space may be formed between the inner and outer wall members of the folding cool box A in each member. Thus, by forming a space between the inner wall member and the outer wall member of the folding cool box A in the region where the reinforcing recess D is formed, the bending strength of the

wall members

23a, 31a, 40a, 60a in which the reinforcing recess D is formed. The

hollow portions

23b, 31b, 40b, and 60b can be continuously formed in the region where each of the members faces the cold insulation space R while improving the above. Therefore, it becomes possible to form the

hollow portions

23b, 31b, 40b, 60b including the region where the reinforcing concave portion D is formed over the entire region where each member faces the cold insulation space R, and the folding cold insulation box A It is possible to further improve the cold insulation performance.

Further, the bottom plate 23, the side wall body 31, the upper partition portion 40A, the lower partition portion 40B, and the portion of the lid 60 that does not face the cold insulation space R do not have the

hollow portions

23b, 31b, 40b, 60b. You may comprise by a solid part. Thereby, it is possible to improve the strength of each member while preventing the cooling performance of the folding cold box A from being lowered, and to improve the durability of the folding cold box A.

Further, a hollow portion similar to other members may be formed in one or both of the top frame 10 and the bottom frame 20. In this case, it is preferable that the top frame 10 and the bottom frame 20 have a hollow part inside the part facing the cold insulation space R.

(Example 1)
Embodiment 1 of the present invention will be described below.

In the folding cool box A described in the above embodiment, the bottom plate 23 having the

hollow portions

23b, 31b, 40b, 60b, the side wall body 31 of the first side wall 30, the upper partition portion 40A of the second side wall 40, and The thickness T1 to T4 of the lower partition portion 40B and the lid 60 were 20 mm, respectively, and the wall thickness of each

wall member

23a, 31a, 40a, 60a was 1 mm. In addition, the recessed part D for reinforcement was not formed in each said member. The inner size of the folding cool box A was 400 mm × 250 mm × 110 mm, and the area of its outer surface was about 0.474 m ² .

About 5 ° C. of water of about 1 ° C. contained in a container is accommodated in the cold storage space R of the folding cold storage box A, and the cold storage box in which the folding cold storage box A is sealed by the lid 60 is about 30 ° C. assuming the outdoor temperature in summer. The temperature of the water inside the cold box was measured every 0.5 hours (30 minutes) up to 10 hours. The measurement results are shown in Table 1 below.

Here, the thermal conductivity Hc (W / m ² K) of the folding cool box A is E (kcal) for the energy that has entered the folding cool box A, and the area of the outer surface of the folding cool box A is S (m ² ). The difference between the average temperature of the outside air temperature and the average temperature of water is T (K), and the measurement time is Hr (h).

Hc = E / (S × T × Hr) (1)

The energy E (kcal) that has entered the folding cold box A is c (kcal / (kg · ° C)) as the specific heat of water, W (kg) as the weight of water, and ΔT (° C) as the temperature rise of water. For example, it is calculated | required by the following formula | equation (2).

E = c × W × ΔT (2)

The energy E obtained from the above formula (2) was 146.7 kcal because the temperature of 5 kg of water rose by 29.3 ° C. As a result, the thermal conductivity Hc of the folding cold box A of the present example obtained from the above formula (1) was about 3.8 (W / m ² K).

From the above measurement results, for example, when storing refrigerated / frozen products in the cold storage space R of the folding cool box A and delivering them to homes, or when storing refrigerated / frozen products and delivering them to retail stores, etc. When the box A is temporarily kept in a place where the temperature is relatively high, it has been confirmed that the folded cool box A exhibits sufficient cool performance.

FIG. 8 is a view corresponding to FIG. 4 showing another embodiment of the folding cold box according to the present invention. In the folding cold box of this form, the bottom cold plate 23 and the lid 60 are provided with the hollow part 23b or the hollow part 60b in the folding cold box described with reference to FIGS. The bottom plate 23S and the lid body 60S are different in that they are entirely solid, that is, do not include a hollow portion and a reinforcing concave portion. Other configurations including the outer dimensions of the bottom plate 23S and the lid 60S may be the same, and the same members are denoted by the same reference numerals, and description thereof is omitted.

In the folding cool box of the form shown in FIG. 8, the material of the bottom plate 23S and the lid 60S is preferably a heat insulating material from the viewpoint of maintaining a high heat insulating property, and more preferably a polystyrene resin, a polyolefin resin, or the like. It is a foamed resin. Although not shown, according to the heat insulation performance required for the folding cool box, not only the bottom plate 23S and the lid 60S but only one of them is a solid product, and the other has a hollow part. Also good.

9 and 10 show another form of the bottom frame 20 used in the folding cold box according to the present invention. In the folding cool box described with reference to FIGS. 1 to 8, the bottom plate 22a constituting the bottom frame 20 is shown as having a flat back surface, but in the case shown in FIGS. 9 and 10, the bottom plate 22a is shown. A large number of ridges 22b are erected in a grid pattern on the back surface of the. Generally, in a folded cold box, when the bottom plate 22a is simply a thin flat plate, depending on the usage history, the bottom plate 22a tends to have a downwardly protruding drum shape. When the bottom plate 22a has such a shape, when placed on the ground, the installation state becomes unstable, and rotation in the surface direction is likely to occur. Although it is possible to prevent the deformation by increasing the thickness of the bottom plate 22a, it is not preferable because the material cost increases and the weight increases.

The inconvenience can be solved by integrally forming an appropriate number of protrusions 22b having a required height on the back surface of the bottom plate 22a as shown in FIGS. That is, by forming the protrusion 22b on the back surface, the strength of the bottom plate 22a can be improved without causing a large increase in material cost or weight increase, preventing unnecessary deformation, and placing it on the ground. High stability can be maintained.

In particular, as clearly shown in FIG. 10, the height of the ridge 22b is a ridge 22b1 having a high height in the peripheral region of the bottom plate 22a, as in a region C surrounded by a two-dot chain line in FIG. In the central region, the protrusion 22b2 having a lower height is used, so that even when the central region of the bottom plate 22a bulges downwards due to changes over time, the bulges to the convexes. A stable ground posture can be maintained by avoiding the touched area from touching the ground and only the surrounding ridge 22b1 having a high height touching the ground. Thereby, it becomes possible to more reliably prevent the rotation in the surface direction from being easily generated.

Although not shown in the drawing, the intended purpose can be achieved even if the projection 22b is not formed in the central region on the back surface of the bottom plate 22a and the flat surface remains. In addition, the protrusion 22b may have a lattice shape as illustrated, or may be formed radially from the central region toward the surrounding region. Moreover, the combination of a radial protrusion and a concentric protrusion may be sufficient. Furthermore, the technology of integrally forming the protrusion 22b on the back surface of the bottom plate so as to be lower in the central region than the surrounding region can be applied to all the cold boxes that are placed directly on the ground. However, the present invention is not limited to the folding cool box having the shape shown in FIGS.

FIG. 11 is a view corresponding to FIG. 4 showing another embodiment of the folding cold box according to the present invention. FIG. 12 is an enlarged cross-sectional view showing a portion XII in FIG. In the folding cool box described based on FIGS. 1 to 7, the bottom plate 23, the side wall body 31, the upper partition portion 40A, the lower partition portion 40B, and the

hollow portions

23b, 31b, 40b (see FIG. 3) and 60b of the lid 60 are provided. In contrast to the hollow space, the folding cold box of this embodiment is different in that the heat insulating material H is filled in the

hollow portions

23b, 31b, 40b, and 60b. Other configurations may be the same, and the same members are denoted by the same reference numerals, and description thereof is omitted.

In the folding cold box shown in FIG. 11, the heat insulating material H filled in the

hollow portions

23b, 31b, 40b, and 60b is preferably, for example, a polyurethane-based foamed resin. The heat insulating material H of the present embodiment is made of foamed polyurethane. Thereby, compared with the case where

hollow part

23b, 31b, 40b, 60b is a cavity, the heat insulation performance of a folding cool box can be improved further.

Further, as shown in FIG. 12, at least one of the bottom plate 23, the side wall body 31, the upper partition portion 40 A, the lower partition portion 40 B, and the lid body 60, the hollow portion 31 b (or 23 b, 40 b, 60 b). The thickness T2 (or T1, T3, T4, or T5) of the portion having a thickness of 10 mm or more and 100 mm or less, and the wall member 31a (or 23a, 40a, The wall thickness t2 of 60a) is preferably 0.5 mm or more and 5 mm or less. Thereby, the heat flow rate of the folding cool box A can be set to, for example, 3.0 W / m ² K or less.

Here, for example, the heat transmissibility of the side wall body 31 is obtained by dividing the heat transfer coefficient of the heat insulating material H by the thickness T2. Therefore, for example, when the thermal conductivity of the polyurethane foam is 0.026 W / mK and the thickness T2 is 25 mm, the thermal conductivity of the side wall body 31 is 0.026 (W / mK) /0.025 (m). = 1.04 (W / m ² K).

Further, it is preferable that the bottom plate 23, the side wall body 31, the upper partition portion 40A, the lower partition portion 40B, and the

wall members

23a, 31a, 40a, 60a of the lid body 60 are made of a polyolefin resin. Thereby, sufficient intensity | strength and durability of

wall member

23a, 31a, 40a, 60a are securable. In particular, when a folding cold box is used in a low temperature environment of 0 ° C. or lower, sufficient strength and durability can be maintained by configuring the

wall members

31a, 23a, 40a, and 60a with a polyethylene resin. .

Further, the bottom plate 23, the side wall body 31, the upper partition portion 40A, the lower partition portion 40B, and the

wall members

23a, 31a, 40a, and 60a of the lid body 60 are filled with a heat insulating material H as shown in FIG. And a screw 31d that closes the opening 31c after being filled with the heat insulating material H. A recess 31e is provided around the opening 31, and the head of the screw 31d is not projected from the surface of the wall member 31a by accommodating the head of the screw 31d in the recess 31e. Thus, by providing the opening 31c in the wall member 31a (or 23a, 40a, 60a), the heat insulating material H can be easily filled in the hollow portion 31b (or 23b, 40b, 60b). Moreover, the heat insulating material H can be enclosed in the hollow part 31b (or 23b, 40b, 60b) by plugging the opening 31c with the screw 31d after the injection of the heat insulating material H.

(Example 2)
Embodiment 2 of the present invention will be described below.

In the folding cool box described in the above-described embodiment, the

hollow portions

23b, 31b, 40b, and 60b were prepared as the heat insulating material H and filled with foamed polyurethane. In each folding cool box, the bottom plate 23, the side wall body 31 of the first side wall 30, the upper partition portion 40A and the lower partition portion 40B of the second side wall 40, and the thicknesses T1 to T4 of the lid 60 are 20 mm, respectively. The wall thickness of the

wall members

Accommodates 22 kg of water at approximately 5 ° C. in a cold storage box R in which the prepared hollow part is filled with the heat insulating material H and in the cold storage space R of the folding cold storage box in which the hollow part is not filled with the heat insulating material H. Then, the folding cool box is sealed with the lid 60 and left in a thermostatic chamber set to a temperature environment of about 30 ° C. assuming an outdoor temperature in summer, and the temperature of the water inside the cool box is set to 0.5 hours (30 Measurement was performed every 10 minutes up to 10 hours. Furthermore, in each of these folded cool boxes, three 700 g of the regenerator material C (see FIG. 2A) were accommodated, and the temperature of the water inside the cool box was measured under the same conditions. The measurement results are shown in FIG.

FIG. 13 is a graph showing the relationship between the temperature of water in the folding cold box according to the present example and the elapsed time, with the horizontal axis representing time (Hr) and the vertical axis representing temperature (° C.). In FIG. 13, a straight line L0 indicated by a one-dot chain line indicates the environmental temperature. Moreover, the curve L1 shown with a broken line has shown the temperature of the water in the folding cool box which is not filled with the heat insulating material H in the hollow part, and the cool storage material C is not accommodated. A curved line L2 indicated by a solid line indicates the temperature of the water in the folded cold insulation box in which the hollow portion is filled with the heat insulating material H but the cold storage material C is not accommodated. Moreover, the curve L3 shown with a dotted line has shown the temperature of the water in the folding cool box which the cold storage material C was accommodated, although the heat insulating material H is not filled in the hollow part. Moreover, the curve L4 shown with a dashed-two dotted line has shown the temperature of the water in the folding cool box with which the hollow part was filled with the heat insulating material H and the cool storage material C was accommodated.

As shown by the straight line L4, the folding cold box in which the hollow portion is filled with the heat insulating material H and the cold storage material C is accommodated has the lowest water temperature after 10 hours, and the temperature rise of the water is 5 ° C. or less. Could be suppressed. Next to this folding cold box, the hollow portion shown in the straight line L3 is not filled with the heat insulating material H, but the cold cooling performance of the folding cold box containing the cold storage material C is high, and the water after 10 hours has passed. Was able to be suppressed to about 10 ° C.

As shown by the straight line L2, the temperature of the water in the folded cold box in which the hollow portion is filled with the heat insulating material H and the cold storage material C is not accommodated is slightly higher than the temperature of the water in the folded cold box shown by the straight line L3. Although the tendency to become high was seen, the raise of the water temperature after 10-hour progress was able to be suppressed to about 10 degreeC. As shown by the straight line L1, the folding cold box in which the hollow portion is not filled with the heat insulating material H and the cold storage material C is not stored has a lower cooling performance than the other folding boxes, but after 10 hours have passed. The temperature of the contained water could be maintained at a temperature nearly 10 ° C. lower than the external environment.

A ... Folding cool box, 10 ... Top frame, 20 ... Bottom frame, 22b ... Projection formed on the back surface of the bottom plate, 22b1 ... Projection with high height, 22b2 ... Projection with low height, 23 ... Bottom plate , 23a ... wall member, 23b ... hollow part, 30 ... first side wall, 31a ... wall member, 31b ... hollow part, 40 ... second side wall, 40A ... upper partition part, 40B ... lower partition part, 40a ... wall 40b ... hollow part, 40C ... bent part, 50 ... spacer, 60 ... lid, 60a ... wall member, 60b ... hollow part, H ... heat insulating material, R ... cold insulation space, S ... space, T1-T4 ... Thickness of the part having a hollow part

Claims

A top frame, a bottom plate and a bottom frame, a pair of first side walls in which the upper side or the lower side is hinged to either the top frame or the bottom frame, a bending in which the upper side is hinged to the bottom frame and the lower side is hinged A pair of second side walls that can stand upright, and a folding cold box provided with a lid,
The second side wall includes at least an upper partition portion, a lower partition portion, and a bent portion connecting the upper partition portion and the lower partition portion, which are arranged in parallel in the vertical direction,
The bottom plate, the first side wall, the upper partition portion and the lower partition portion constituting the second side wall, and all of the lid, or at least the first side wall and the second side wall thereof The folding compartment is characterized in that the upper compartment portion and the lower compartment portion constituting the interior have a hollow portion at least inside the portion facing the cold insulation space defined by them.
At least one of the bottom plate, the first sidewall, the upper partition portion and the lower partition portion constituting the second sidewall, and the lid body having the hollow portion has the hollow portion. 2. The folding cold box according to claim 1, wherein the thickness of the portion is 5 mm or more and 50 mm or less, and the thickness of the wall member that defines the hollow portion is 0.5 mm or more and 5 mm or less.
The bottom plate, the first side wall, the upper and lower partition parts constituting the second side wall, and the lid body having the hollow part, wherein at least one hollow part is defined. The folding cold insulation box according to claim 1, wherein a reinforcing concave portion is formed in the wall member formed.
The folding cool box according to claim 1, wherein a stepped portion for supporting an end portion of the regenerator material is formed on an inner surface of the top frame.
The bent portion has a thickness smaller than the thickness of the upper partition portion and the lower partition portion,
The second side wall is a spacer for filling a space formed on the side of the bent portion by the thickness of the bent portion being thinner than the upper and lower compartment portions when standing upright. The folding cold box according to claim 1, further comprising:
The folding cold box according to claim 1, wherein the hollow portion is filled with a heat insulating material.
At least one of the bottom plate, the first sidewall, the upper partition portion and the lower partition portion constituting the second sidewall, and the lid body having the hollow portion has the hollow portion. The folding cold insulation box according to claim 6, wherein the thickness of the portion is 10 mm or more and 100 mm or less, and the wall member defining the hollow portion has a thickness of 0.5 mm or more and 5 mm or less.
The folding insulation box according to claim 7, wherein the heat insulating material is a polyurethane-based foamed resin.