JP2024056342A - Heat insulation box body and manufacturing method of the same - Google Patents

Abstract

To provide: a heat insulation box body with heat insulation performance having been improved; and to provide a manufacturing method of the same.SOLUTION: In a heat insulation box body 3: a housing in which an outer box 15 and an inner box 17 are connected is arranged with a back plate 19 of the outer box 15 facing upward; a urethane liquid is injected into a space between the outer box 15 and the inner box 17 from injection ports 20 at four corners of the back plate, so as to be caused to foam in the space to form a heat insulation material 25; On an inner side of the injection port 20, a guide member 22 is provided which guides the urethane liquid so as to drop to a drop point close to a center in a longitudinal direction of the heat insulation box body 3.SELECTED DRAWING: Figure 2

Description

The present invention relates to a heat-insulating box and a method for manufacturing the same.

Patent document 1 discloses an insulating box for a refrigerator in which a urethane liquid is injected into the space formed between the outer box and the inner box, and foamed within the space to form an insulating material.

JP 2005-233506 A

This disclosure provides an insulated box with improved insulation performance and a method for manufacturing the same.

In aspect 1, a housing connecting an outer box and an inner box is placed with the back panel of the outer box facing up, and urethane liquid is injected into the space between the outer box and the inner box from injection ports at the four corners of the back panel, and foamed in the space to form a thermal insulation material. In this insulating box, a guide member is provided inside the injection port to guide the urethane liquid so that it falls to a drop point near the center of the longitudinal direction of the insulating box.

In aspect 2, in the method for manufacturing an insulated box, a guide member is provided that is arranged inside the injection port and guides the urethane liquid so that the urethane liquid falls to a drop point near the center of the longitudinal direction of the insulated box, and the urethane liquid is injected along the guide member.

This disclosure improves the insulation performance of the insulated box.

FIG. 1 is a perspective view showing a refrigerator according to a first embodiment; FIG. 1 is a perspective view showing a heat-insulating box according to a first embodiment; A perspective view showing the inner box FIG. 13 is a perspective view showing the step of injecting urethane liquid FIG. 13 is a perspective view showing the step of injecting urethane liquid FIG. 1 is a perspective view showing a foaming process of a urethane liquid. FIG. 1 is a perspective view showing a foaming process of a urethane liquid. FIG. 1 is a perspective view showing a foaming process of a urethane liquid. FIG. 1 is a perspective view showing a foaming process of a urethane liquid. FIG. 1 is a perspective view showing a foaming process of a urethane liquid. FIG. 1 is a perspective view showing a foaming process of a urethane liquid. FIG. 1 is a perspective view showing a foaming process of a urethane liquid. FIG. 1 is a perspective view showing a foaming process of a urethane liquid. FIG. 1 is a perspective view showing a foaming process of a urethane liquid. FIG. 1 is a perspective view showing a foaming process of a urethane liquid. FIG. 1 is a perspective view showing a foaming process of a urethane liquid. FIG. 13 is a perspective view showing a heat-insulating box according to a second embodiment; FIG. 11 is a side view showing a heat-insulating box according to a second embodiment of the present invention; 18A-A cross-sectional view of FIG.

(Knowledge and other information that forms the basis of this disclosure)
At the time when the inventors came up with the idea of the present disclosure, there was a technique for forming an insulated box in a refrigerator by injecting a urethane liquid into the space between an outer box and an inner box and foaming it in the space. In this technique, the urethane liquid is injected from injection ports provided in the four corners of the back panel of the outer box with the back panel facing up. After injection, the urethane liquid starts to foam and gradually rises in the space, and finally fills the space between the back panel of the outer box and the inner box, forming the insulated box.
The inventors discovered a problem in that when the urethane liquid foams, the foamed urethane has difficulty flowing laterally, and if the flow is hindered by the shape of the inner box or the presence of vacuum insulation material, etc., voids (hollow spaces) may occur, which could result in a decrease in insulation performance.In order to solve this problem, the inventors came up with the subject matter of the present disclosure.
Therefore, the present disclosure provides a heat-insulating box having improved heat-insulating performance.

Hereinafter, the embodiments will be described in detail with reference to the drawings. However, more detailed explanation than necessary may be omitted. For example, detailed explanation of already well-known matters or duplicate explanation of substantially the same configuration may be omitted. This is to avoid the following explanation becoming more redundant than necessary and to facilitate understanding by those skilled in the art.
It should be noted that the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

Hereinafter, the first embodiment will be described with reference to the drawings.
[1-1. Configuration]
FIG. 1 is a perspective view showing a heat-insulating box according to the first embodiment.
The refrigerator 1 includes an insulated box (housing) 3, and includes a refrigerator compartment 5, a vegetable compartment 7, a micro-freezing compartment 8, and a freezer compartment 9 inside the insulated box 3. An opening 3A of the insulated box 3 is provided with a double-door door 2, and a plurality of inner pockets 2A, 2B, and 2C are arranged vertically and spaced apart on the inner surface of each door 2. On the back surface of the refrigerator compartment 5, a cooler (evaporator) 10, a blower 11, and an air passage structure 12 connected to the outlet of the blower 11 are provided.
The cold air cooled by the cooler 10 is sent by a blower 11 to an air passage structure 12. Although not shown, the air passage structure 12 includes a main air passage that guides cold air to the upper part of the refrigerator compartment 5, a sub-air passage that guides cold air to the left and right sides of the refrigerator compartment 5, and a front discharge port that guides cold air to the center of the refrigerator compartment 5.

2 is a perspective view showing the heat insulating box 3. The heat insulating box 3 includes an outer box 15 and an inner box 17 connected to the inside of the outer box 15 with a gap therebetween.
The inner box 17 is integrally molded from resin, as shown in Fig. 3. The outer box 15 has side panels 18 that surround the four side surfaces of the inner box 17, and a back panel 19 that surrounds the back surface of the inner box 17. In the four corners of the back panel 19, injection ports 20 for injecting urethane liquid between the outer box 15 and the inner box 17 are formed. Guide members 22 are arranged inside the four injection ports 20 to guide the injected urethane liquid between the outer box 15 and the inner box 17.

Each of the guide members 22 includes a guide portion 23 for guiding the urethane liquid so that the urethane liquid falls to a falling point near the center of the heat-insulating box 3 in the longitudinal direction.
The guide member 22 is formed, for example, from a molded insulating material, and is attached to the outer surface of the inner box 17 using double-sided tape or an adhesive (not shown).

2, the heat-insulating box 3 is placed on a workbench 24 with the back plate 19 of the outer box 15 facing up. In this state, urethane liquid is poured into the injection ports 20 at the four corners of the back plate 19. The urethane liquid is a mixture of two-component stock solutions.
The urethane liquid is injected into the space between the outer box 15 and the inner box 17, foams within the space, and hardens to form the insulating material 25 that surrounds the outside of the inner box 17.

[1-2. Formation process of heat insulating material]
The inventors simulated the process in which urethane liquid is injected through four injection ports 20 into the space between the outer box 15 and the inner box 17, foams within this space, hardens, and forms the insulation material 25.

4 is a perspective view of the heat-insulating box 3 showing the state 1.00 seconds after the start of injection of the urethane liquid, FIG. 5 is a perspective view of the heat-insulating box 3 showing the state 3.11 seconds after the start of injection of the urethane liquid, and FIG.
As shown in Figures 4 and 5, the urethane liquid injected from the injection port 20 is guided by the guide member 22 and falls to drop points P1 to P4 respectively near the center of the longitudinal direction of the insulated box body 3, and gradually spreads from that position in the longitudinal direction of the insulated box body 3.
Here, the inner box 17 includes a partition wall 28 that separates the refrigerator 1 between the refrigerator compartment 5 and the freezer compartment 9 in the short side direction of the insulated box body 3, and a trim section 30 that is formed in the short side direction on the freezer compartment 9 side. Once the urethane liquid has fallen to the drop points P1 to P4, it enters the internal space of the trim section 30 that is close to the drop points P1 to P4.
After a predetermined amount of urethane liquid has been injected, foaming begins in the space between the outer box 15 and the inner box 17 in the longitudinal direction of the insulated box body 3, and in the space inside the trim portion 30 close to the drop points P1 to P4, as shown in Figure 6.

7 to 15 are perspective views of the heat-insulating box 3 showing the process in which the urethane foams H1 to H4 grow, and FIG. 16 shows the heat-insulating material 25 after completion.
FIG. 7 shows the state 6.83 seconds after the start of injection of the urethane liquid.
At this point, the urethane foam H1-H4 grows gradually in the height direction in the longitudinal direction of the insulating box 3, but does not grow much in the lateral direction, compared to the state at the start of foaming in Figure 6. Within the space of the trim part 30, the growth of the urethane foam H5 begins.

FIG. 8 shows the same result after 13.04 seconds.
The urethane foams H1 to H4 grow in the longitudinal direction of the insulating box 3 as their height approaches the back panel 19 of the insulating box 3, and with this growth, the urethane foams H1-1 to H4-1 gradually intrude also in the lateral direction of the insulating box 3. At this point, the urethane foam H6 also gradually grows in the space inside the partition wall 28, and inside the trim portion 30, the urethane foams H5 growing from both sides are connected to each other in the lateral direction of the insulating box 3.

FIG. 9 shows the same result after 15.07 seconds.
The urethane foams H1 to H4 gradually grow from the four corners of the insulating box 3 toward the center in the longitudinal direction and the center in the lateral direction, and in the longitudinal direction of the insulating box 3, the height of the urethane foams H1 to H4 reaches the height of the side panel 18 in approximately half the area. When this state is reached, the bottom ends of the urethane foams H1 to H4 approach each other in the longitudinal direction of the insulating box 3.
FIG. 10 shows the same result after 16.94 seconds.
The urethane foams H1 to H4 grow, and at the timing when the height of the urethane foams H1 to H4 reaches the height of the side panel 18 in approximately half the region, the lower ends of the urethane foams H1 to H4 join together in the longitudinal direction of the insulating box 3. Also, at this timing, in the space inside the partition wall 28, the urethane foams H6 growing from both sides join together in the lateral direction of the insulating box 3. Also, at this timing, the lower ends of the urethane foams H1-1 to H4-1 approach each other in the lateral direction of the insulating box 3.

FIG. 11 shows the same result after 19.10 seconds.
The urethane foams H1 to H4 grow together and gradually rise with the lower ends of the urethane foams H1 to H4 connected to each other in the longitudinal direction of the insulating box 3. At this point, the lower ends of the urethane foams H1 to H4 connect to each other in the lateral direction of the insulating box 3 with a delay.
FIG. 12 shows the same result 23.07 seconds later.
The urethane foams H1 to H4 have almost completely grown in the height direction of the insulating box body 3 and start to enter the space between the back plate 19 and the inner box 17.

FIG. 13 shows the result 24.92 seconds later, and FIG. 14 shows the result 26.55 seconds later.
In FIG. 13, the connection of the urethane foams H1 to H4 and H1-1 to H4-1 is almost complete within the space between the side panels 18 on the four sides and the inner box 17.
In Figure 14, after the connection on all four sides is completed, the urethane foams H1 to H4 and H1-1 to H4-1 enter the space between the back panel 19 and the inner box 17 and are almost completely connected except for the unconnected section M in the center. Figure 15 shows the same 28.80 seconds later. In the space between the back panel 19 and the inner box 17, the unconnected section M in the center gradually decreases. Figure 16 shows the same 29.00 seconds later. The unconnected section M in the center disappears and the insulation material 25 is complete.

The inventors discovered through simulation that the occurrence of voids can be suppressed by setting drop points P1 to P4 and guiding the urethane liquid to the set drop points P1 to P4 using a guide member 22.

In order to suppress the occurrence of voids, the following points are important:
First, the urethane foams H1 to H4 are gradually grown from the four corners of the heat-insulating box 3 toward the center in the longitudinal direction and the center in the lateral direction, as shown in Figs.
Secondly, as shown in FIG. 10, when the height of the urethane foams H1 to H4 reaches the height of the side panels 18 on the four sides in approximately half of the area, the lower ends of the urethane foams H1 to H4 are connected to each other.

Thirdly, as shown in Figures 11 to 13, each of the urethane foams H1 to H4 is raised while connected, and the upper ends of all of the urethane foams H1 to H4 are connected together within the space between the back panel 19 and the inner box 17, as shown in Figure 14.
Fourth, as shown in FIGS. 14 to 16, the unconnected portion M at the center of the space between the back panel 19 and the inner box 17 is gradually reduced.
Fifth, as shown in Figs. 10 and 11, after the urethane foams H1 to H4 are connected in the longitudinal direction of the insulating box 3, the urethane foams H1-1 to H4-1 are connected in the lateral direction.

Sixth, as shown in Figures 12 to 14, the urethane foams H1 to H4 are connected in the longitudinal direction of the insulated box body 3, and the urethane foams H1-1 to H4-1 are connected in the transverse direction. In this connected state, the urethane foams H1 to H4, H1-1 to H4-1 are allowed to enter the space between the back panel 19 and the inner box 17.
Seventh, within the space between the back panel 19 and the inner box 17, the central unconnected portion M of the urethane foams H1 to H4 and H1-1 to H4-1 is gradually reduced.

In the first embodiment, the drop points P1 to P4 can be controlled by adjusting the shape of the guide member 22, the length of the guide portion 23, and the like.
In the design stage of the insulated box 3, a simulation is performed depending on the shape of the inner box 17 and the outer box 15, etc., to determine the drop points P1 to P4 in advance, and the shape of the guide member 22 and the length of the guide portion 23, etc. are set appropriately.
The guide member 22 is a heat insulating material, and although the guide member 22 is embedded in the heat insulating material 25, the heat insulating properties of the heat insulating box 3 are not impaired.

[1-3. Effects, etc.]
As described above, in this embodiment, the insulating box 3 connecting the outer box 15 and the inner box 17 is placed with the back panel 19 of the outer box 15 facing up, and urethane liquid is injected into the space between the outer box 15 and the inner box 17 through the injection ports 20 at the four corners of the back panel 19 and foamed in the space to form the insulating material 25.In this insulating box, a guide member is provided inside the injection ports 20 to guide the urethane liquid so that the urethane liquid falls to drop points P1, P2, P3, and P4 near the longitudinal center of the insulating box 3.
According to this configuration, the urethane liquid injected from the injection port 20 is guided by the guide member 22 and falls to drop points P1, P2, P3, and P4 near the center in the longitudinal direction of the insulating box 3. If the drop points P1, P2, P3, and P4 at which the generation of voids is suppressed are set through simulation, the generation of voids can be suppressed by guiding the urethane liquid to the drop points with the guide member.

In addition, in this embodiment, the guide member 22 may guide the urethane liquid injected from the injection ports 20 at the four corners to the drop points P1, P2, P3, P4 so that the lower ends of the urethane foams H1, H2, H3, H4 connect with each other when they grow and reach the upper ends of the side panels 18 of the outer box 15.
According to this configuration, the lower ends of the respective urethane foams H1, H2, H3, H4 are connected to each other when they grow and reach the upper ends of the side panels 18 of the outer box 15, improving the lateral fluidity of the urethane foams H1, H2, H3, H4 and suppressing the occurrence of voids.

In addition, in this embodiment, the guide member 22 may guide the urethane liquid to the drop points P1, P2, P3, P4 so that when connected, the respective urethane foams H1, H2, H3, H4 rise and the upper ends of all of the urethane foams H1, H2, H3, H4 connect with each other within the space between the back panel 19 and the inner box 17.
With this configuration, the individual urethane foams H1, H2, H3, and H4 rise while connected, and the upper ends of all of the urethane foams H1, H2, H3, and H4 connect to each other within the space between the back panel 19 and the inner box 17, improving the lateral fluidity of the urethane foams H1, H2, H3, and H4 and suppressing the occurrence of voids.

In this embodiment, the guide member 22 may be formed from a molded insulating material.
This configuration improves the heat insulating performance.

In addition, in this embodiment, the insulating box 3 connecting the outer box 15 and the inner box 17 is placed with the back panel 19 of the outer box 15 facing up, and urethane liquid is injected into the space between the outer box 15 and the inner box 17 from injection ports 20 at the four corners of the back panel 19 and foamed in the space to form the insulating material 25. The insulating box 3 is provided with guide members 22 that are positioned inside the injection ports 20 and guide the urethane liquid so that the urethane liquid falls to drop points P1, P2, P3, and P4 near the longitudinal center of the insulating box 3, and the urethane liquid is injected along the guide members 22.
According to this configuration, the urethane liquid injected from the injection port 20 is guided by the guide member 22 and falls to drop points P1, P2, P3, and P4 near the center in the longitudinal direction of the insulating box 3. If the drop points P1, P2, P3, and P4 at which the generation of voids is suppressed are set through simulation, the generation of voids can be suppressed by guiding the urethane liquid to the drop points with the guide member.

In addition, in this embodiment, the urethane liquid injected from the injection ports 20 at the four corners may be guided to the drop points P1, P2, P3, P4 so that the lower ends of the urethane foams H1, H2, H3, H4 connect with each other when they grow and reach the upper ends of the side panels 18 of the outer box 15.
According to this configuration, the lower ends of the respective urethane foams H1, H2, H3, H4 are connected to each other when they grow and reach the upper ends of the side panels 18 of the outer box 15, improving the lateral fluidity of the urethane foams H1, H2, H3, H4 and suppressing the occurrence of voids.

In addition, in this embodiment, the urethane foams H1, H2, H3, H4 rise in a connected state, and the urethane liquid may be guided to the drop points P1, P2, P3, P4 so that the upper ends of all of the urethane foams H1, H2, H3, H4 connect with each other within the space between the back panel 19 and the inner box 15.
With this configuration, the individual urethane foams H1, H2, H3, and H4 rise while connected, and the upper ends of all of the urethane foams H1, H2, H3, and H4 connect to each other within the space between the back panel 19 and the inner box 17, improving the lateral fluidity of the urethane foams H1, H2, H3, and H4 and suppressing the occurrence of voids.

(Embodiment 2)
Next, a second embodiment will be described with reference to the drawings.
[2-1. Configuration]
Fig. 17 is a cross-sectional perspective view showing the heat-insulating box 3. Note that the same parts as those in Fig. 1 and Fig. 2 are given the same reference numerals and their description will be omitted.
The insulating box body 3 includes an outer box 15 and an inner box 17 connected to the inside of the outer box 15 with a gap therebetween. The outer box 15 includes a pair of side plates (longitudinal side plates) 18 that surround the sides of the inner box 17, and one piece of vacuum insulating material 50 is arranged on each of the inner surfaces of the pair of side plates 18.

FIG. 18 is a side view of the heat insulating box 3, and FIG. 19 is a cross-sectional view taken along line AA of FIG.
As shown in Fig. 18, a horizontal groove 51 extending linearly in the horizontal direction and a pair of vertical grooves 53 extending linearly in the vertical direction perpendicular to the horizontal groove 51 are formed on the surface of the vacuum insulation material 50 facing the inner box 17, located in the lower region of the vacuum insulation material 50. As shown in Fig. 18, the horizontal groove 51 is formed to a predetermined depth T1. As shown in Fig. 19, the dimension T2 between the inner box 17 and the vacuum insulation material 50 is narrow, and the dimension T3 between the inner box 17 and the groove bottom of the horizontal groove 51 is wide. The shape of the dimensions of the vertical groove 53 is the same as that of the horizontal groove 51, although not shown in the figure.

As shown in FIG. 18, the guide member 22 is attached to the outer surface of the inner box 17 using double-sided tape or adhesive (not shown). The guide portion 23 of the guide member 22 is located directly below the injection port 20, extends diagonally downward, and terminates at the position of the vertical groove 53. The urethane liquid injected from the injection port 20 flows along the guide portion 23 into the wide portion of dimension T3 where the vertical groove 53 is located, and falls along the vertical groove 53.

In the second embodiment, drop points P1 to P4 are set in a simulation, and vertical grooves 53 are formed in advance in the vacuum insulation material 50 corresponding to the drop points P1 to P4. That is, drop points P1 and P2 are set at the lower ends of the vertical grooves 53.
18 has been described with respect to the vacuum insulation material 50 on the front side panel 18, but a similar vacuum insulation material 50 is also arranged on the rear side panel 18, and although not shown, horizontal grooves 51 and vertical grooves 53 are similarly formed in this vacuum insulation material 50. Drop points P3 and P4 are set at the lower ends of the vertical grooves 53 of the vacuum insulation material 50 (not shown).

[2-2. Formation process of heat insulating material]
The present inventors have found that the generation of voids in the insulating material 25 can be suppressed by guiding a urethane liquid into the preset vertical grooves 53 .
As shown in Figures 4 and 5, the urethane liquid injected from the four injection ports 20 undergoes a foaming process substantially similar to that shown in Figures 6 to 16, thereby forming insulation material 25 in the space formed between the outer box 15 and the inner box 17.
In the second embodiment, the horizontal grooves 51 intersect with the vertical grooves 53 of the vacuum insulation material 50, improving the fluidity of the urethane foams H1 to H4 in the horizontal direction.

[2-3. Effects, etc.]
As described above, in this embodiment, vacuum insulation material 50 is arranged on the inner surface of the side panel 18 of the outer box 15, and the guide member 22 guides the urethane liquid into the space formed between the vacuum insulation material 50 and the inner box 17.
According to this configuration, the vacuum insulation material 50 is disposed, so that the insulation performance is improved.

In addition, in this embodiment, the vacuum insulation material 50 may have a horizontal groove 51 and a vertical groove 53 on the surface facing the inner box 17, and the guide member 22 may guide the urethane liquid into the space formed between the horizontal groove 51 and the vertical groove 53 and the inner box 17.
According to this configuration, the horizontal grooves 51 and vertical grooves 53 are formed in the vacuum insulation material 50, so that the fluidity of the urethane foams H1, H2, H3, and H4 is improved and the occurrence of voids is suppressed.

Other Embodiments
Note that the first embodiment has been described as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can be applied to embodiments in which modifications, substitutions, additions, omissions, and the like are made.

(Additional Note)
The above description of the embodiments discloses the following techniques.

(Technique 1)
This insulated box is constructed by placing a housing connecting an outer box and an inner box with the back panel of the outer box facing up, injecting urethane liquid into the space between the outer box and the inner box through injection ports at the four corners of the back panel and foaming it in the space to form insulation, and the insulated box is provided with a guide member on the inside of the injection port for guiding the urethane liquid so that the urethane liquid falls to a falling point near the center of the longitudinal direction of the insulated box.
With this configuration, the urethane liquid injected from the injection port is guided by the guide member and falls to a drop point near the center of the longitudinal direction of the insulating box. If a drop point at which the generation of voids is suppressed is set through simulation, the generation of voids can be suppressed by guiding the urethane liquid to the drop point with the guide member.

(Technique 2)
The guide member guides the urethane liquid injected from the injection ports at the four corners to the drop point so that the lower ends of the urethane foams connect to each other when the urethane foams grow and reach the upper ends of the side panels of the outer box.
With this configuration, the lower ends of each urethane foam connect together as it grows and reaches the upper ends of the side panels of the outer box, improving the lateral fluidity of the urethane foam and suppressing the occurrence of voids.

(Technique 3)
The insulated box body described in Technology 1 or 2, wherein the guide member guides the urethane liquid to the drop point so that each urethane foam rises in the connected state and the upper ends of all the urethane foams are connected to each other within the space between the back panel and the inner box.
With this configuration, each urethane foam rises in the connected state, and the upper ends of all the urethane foams connect to each other within the space between the back panel and the inner box, improving the lateral fluidity of the urethane foam and suppressing the occurrence of voids.

(Technique 4)
An insulated box body described in any one of techniques 1 to 3, wherein a vacuum insulation material is arranged on the inner surface of the side panel of the outer box, and the guide member guides a urethane liquid into a space formed between the vacuum insulation material and the inner box.
According to this configuration, the vacuum insulation material is disposed, so that the insulation performance is improved.

(Technique 5)
The insulated box body described in Technology 4, wherein a groove is provided on a surface of the vacuum insulation material facing the inner box, and the guide member guides urethane liquid into a space formed between the groove and the inner box.
According to this configuration, grooves are formed in the vacuum insulation material, which improves the fluidity of the urethane foam and suppresses the occurrence of voids.

(Technique 6)
The heat-insulating box according to any one of the first to fifth aspects, wherein the guide member is made of a molded heat-insulating material. With this configuration, heat-insulating performance is improved.

(Technique 7)
In a method for manufacturing an insulated box, a housing connecting an outer box and an inner box is placed with the back panel of the outer box facing up, and urethane liquid is injected into the space between the outer box and the inner box through injection ports at the four corners of the back panel and foamed in the space to form insulation.The method for manufacturing an insulated box includes a guide member that is placed inside the injection port and guides the urethane liquid so that the urethane liquid falls to a fall point near the center of the longitudinal direction of the insulated box, and the urethane liquid is injected along the guide member.
With this configuration, the urethane liquid injected from the injection port is guided by the guide member and falls to a drop point near the center of the longitudinal direction of the insulating box. If a drop point at which the generation of voids is suppressed is set through simulation, the generation of voids can be suppressed by guiding the urethane liquid to the drop point with the guide member.

(Technique 8)
The manufacturing method of the insulated box body described in Technology 7, in which the urethane liquid is injected from the injection ports at the four corners and guided to the drop point so that the lower ends of the urethane foams connect to each other when the urethane foams grow and reach the upper ends of the side panels of the outer box.
With this configuration, the lower ends of each urethane foam connect together as it grows and reaches the upper ends of the side panels of the outer box, improving the lateral fluidity of the urethane foam and suppressing the occurrence of voids.

(Technique 9)
The manufacturing method of the insulated box body described in Technology 8, wherein the urethane foams rise in the connected state, and the urethane liquid is guided to the drop point so that the upper ends of all the urethane foams are connected to each other within the space between the back panel and the inner box.
With this configuration, each urethane foam rises in the connected state, and the upper ends of all the urethane foams connect to each other within the space between the back panel and the inner box, improving the lateral fluidity of the urethane foam and suppressing the occurrence of voids.

This disclosure can be suitably used for insulated boxes used in refrigerators and the like, and for methods of manufacturing insulated boxes.

1 Refrigerator 3 Insulated box (casing)
15 Outer box 17 Inner box 18 Side panel 19 Back panel 20 Inlet 22 Guide member 23 Guide section 25 Heat insulating material 28 Partition section 30 Trim section 50 Vacuum heat insulating material 51 Horizontal groove 53 Vertical groove H1 to H6 Urethane foam M Central unconnected section P1 to P4 Drop point T1 Depth T2 Dimension T3 Dimension

Claims (9)

In a heat-insulating box, a housing having an outer box and an inner box connected thereto is placed with the back plate of the outer box facing up, and a urethane liquid is injected into a space between the outer box and the inner box through injection ports at the four corners of the back plate, and foamed in the space to form a heat insulating material,
A guide member is provided on the inside of the injection port to guide the urethane liquid so that the urethane liquid falls to a falling point near the center in the longitudinal direction of the insulating box.
Insulated box. The insulated box according to claim 1, wherein the guide member guides the urethane liquid to the drop point so that the lower ends of the urethane foams join together when the urethane foams grow and reach the upper ends of the side panels of the outer box. The insulated box according to claim 2, wherein the guide member guides the urethane liquid to the drop point so that each urethane foam rises in the connected state and the upper ends of all the urethane foams are connected to each other within the space between the back panel and the inner box. The insulated box according to claim 1, in which a vacuum insulation material is disposed on the inner surface of the side panel of the outer box, and the guide member guides the urethane liquid into the space formed between the vacuum insulation material and the inner box. The insulated box according to claim 4, wherein the vacuum insulation material has a groove on a surface facing the inner box, and the guide member guides the urethane liquid into a space formed between the groove and the inner box. The insulated box according to claim 1, wherein the guide member is formed from a molded insulating material. A method for manufacturing a heat-insulating box includes the steps of: placing a housing having an outer box and an inner box connected together with a back plate of the outer box facing up; injecting a urethane liquid into a space between the outer box and the inner box through injection ports at four corners of the back plate; and foaming the urethane liquid in the space to form a heat insulating material, the method comprising the steps of:
A method for manufacturing an insulated box includes a guide member that is positioned inside the injection port and guides the urethane liquid so that the urethane liquid falls to a falling point near the center of the longitudinal direction of the insulated box, and the urethane liquid is injected along the guide member. The method for manufacturing an insulated box according to claim 7, in which the urethane liquid is guided to the drop point so that the lower ends of the urethane foams join together when the urethane foams grow and reach the upper ends of the side panels of the outer box when the urethane liquid is injected from the injection ports at the four corners. The method for manufacturing an insulated box according to claim 8, wherein the urethane liquid is guided to the drop point so that each urethane foam rises in the connected state and the upper ends of all the urethane foams are connected to each other within the space between the back panel and the inner box.

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