JP2000329454A - Heat insulation box and manufacture of heat insulation box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To join together an inner box and a partition wall through a simple structure and a simple method, to improve the structural strength of a heat insulation box body, and to reinforce heat insulation ability. SOLUTION: This heat insulation box body is formed such that through-holes 20, 21, and 24, 25 are formed in both sides and the back of the groove part of an inner box 14 and both sides and the back of a partition wall 15, and the internal part of the partition wall 15 and a space part between an outer box 13 and the inner box 14 are filled with a foaming heat insulation material 16 by using the through-hikes 20 and 24 on both sides as an inflow hole for a foaming heat insulation material 16 and through-holes 21 and 25 in the back as an air vent hole to join together the inner box 14 and the partition wall 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a partition wall and an inner box of a heat insulating box. The present invention also relates to a method for manufacturing the heat insulating box.

[0002]

2. Description of the Related Art In recent years, refrigerators that are small and can be used in large size from the viewpoint of space saving, that is, refrigerators having a large internal volume and a large volume efficiency with respect to the external dimensions of the refrigerator have become mainstream. In order to increase the volumetric efficiency, the thickness of the outer wall of the heat insulating box of the refrigerator and the thickness of the partition wall that partitions the inside of the heat insulating box must be reduced.

[0003] When the thickness of the heat insulating wall is reduced, the structural strength of the heat insulating box decreases, and in order to suppress the decrease, it is necessary to firmly join the partition wall inside the heat insulating box to the heat insulating box main body. Also,
The joints must have as few gaps as possible to suppress leakage of cool air between the compartments. Needless to say, the joining method should be simple.

[0004] Regarding the method of joining the partition walls, there is a conventional example of a heat insulating box of a refrigerator disclosed in Japanese Utility Model Publication No. 61-17343.

Hereinafter, the above-mentioned conventional heat insulating box will be described with reference to the drawings.

FIG. 8 is a longitudinal sectional view of a conventional heat insulating box.
FIG. 9 is a rear perspective view of the inner box of the conventional heat insulating box. In FIGS. 8 and 9, reference numeral 1 denotes a heat insulating box, which is filled and foamed with a foam heat insulating material 4 between an outer box 2 made of a steel plate and an inner box 3 made of a synthetic resin. Reference numeral 5 denotes a partition wall, which is composed of two upper and lower partition members 6 made of synthetic resin and an internal foam insulation 7. A plurality of storage sections 8 and 9 are formed vertically by the partition wall 5.

A groove 10 for fitting the partition wall 5 is formed in the inner box 3 made of synthetic resin. The groove 10 is provided with an appropriate number of through-holes 11, and a part of the foamed heat insulating material 4 is formed when the foamed heat insulating material 4 is injected and foamed.
The foamed heat insulating material 4 that has flowed in is solidified, and the inner box 3 and the partition wall 5 are joined by the self-adhesiveness of the foamed heat insulating material 4.

In the above-described configuration, it is possible to easily prevent a gap (not shown) from being formed with the inner box 3 without attaching a sealing material (not shown) around the partition wall 5. Further, the structural strength of the heat insulating box 1 can be improved by joining the inner box 3 and the partition wall 5.

[0009]

However, in the above-mentioned conventional configuration, it is necessary to previously incorporate the internal foamed heat insulating material 7 into the partition member 6 constituting the partition wall 5.

SUMMARY OF THE INVENTION The present invention solves the conventional problems, in which the inner box and the partition wall are joined by a simple structure and a simple method to suppress the gap, improve the structural strength of the heat insulating box, and store the storage compartment. The purpose is to enhance the insulation between each other.

[0011]

In order to achieve this object, the heat-insulating box of the present invention is provided with through holes on both sides and the back surface of the inner box groove and the partition wall, and foams the through holes on both sides. The inflow holes and the through holes on the back surface of the heat insulating material are used as air vent holes during foaming.

With this structure, the partition wall and the inner box are closely adhered to each other with no gap with a simple structure, and the strength of the heat insulating box body is improved, and at the same time, the heat insulating property of the upper and lower portions of the partition wall is improved.

[0013] Further, in a box body combining an inner box and an outer box provided with through holes on the side and back surfaces of the groove, a partition wall having through holes provided opposite to the through holes provided in the inner box is provided. Insert into the groove of the box, inject the foamed heat insulating material from the injection hole provided on the back of the box with the front opening of the box facing downward, and separate the foamed heat insulating material from the through holes in the inner box and the side of the partition wall. The air-insulating box is manufactured by removing the air of the foamed heat insulating material from the through holes on the back surface of the inner box and the partition wall.

[0014] Thus, the partition wall and the inner box are tightly adhered to each other without any gap by a simple method, and the strength of the heat insulating box body is improved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a box body comprising an outer box and an inner box, a groove formed on both sides and a back surface on the inner surface of the inner box, In those provided with a partition wall that engages the outer peripheral portions of both sides and the back surface to partition the inside of the box into a plurality of sections, through holes are provided on both sides and the back surface of the groove portion and the partition wall, respectively. The through holes on both side surfaces are used as inflow holes of the foamed heat insulating material, and the through holes on the back surface are used as air vent holes at the time of foaming, and the space between the outer box and the inner box and the inside of the partition wall are filled with the foamed heat insulating material.

The inside of the partition wall is filled with the foam heat insulating material without being filled by the function of venting the through holes on the back surface, and the foam heat insulating material inside the partition wall and the foam heat insulating material of the space formed by the inner box and the outer box. Are connected together.

According to a second aspect of the present invention, in the first aspect of the invention, at least a pair of through holes on both side surfaces are provided near the front opening of the box.

Then, the foamed heat insulating material flows into the inside of the partition wall while the viscosity is low, and the foamed heat insulating material is smoothly filled together with the function of bleeding the through holes provided on the back surface.

According to a third aspect of the present invention, in the first or second aspect, the through holes on both sides of the inner box groove are smaller than the through holes on the sides of the partition wall.

Then, the foamed heat insulating material when passing through the through hole of the inner box flows into the partition wall without being hindered by the peripheral portion of the through hole of the partition wall.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the opposed through-holes on both sides are displaced from the same line in the front-rear direction of the heat insulating box.

The amount of shrinkage of the foamed heat insulating material in a low-temperature environment is reduced, the distance between the foamed heat insulating materials in the lateral direction is reduced, and the amount of depression of the outer box is reduced.

According to a fifth aspect of the present invention, there is provided a box comprising an outer box and an inner box, an injection hole for foamed heat insulating material provided on the back of the box, and both sides and a back on the inner surface of the inner box. And a partition wall which is mounted by engaging the outer peripheral portions of both side surfaces and the back surface with the groove portion, and partitions the inside of the box into a plurality of sections, and on both side surfaces and the rear surface of the groove portion and the partition wall, respectively. In the case where the opposed through-holes are provided, foam insulation is injected from the injection hole on the back of the box with the front opening of the box facing downward, and the foam is injected into the partition wall through the through-holes on both side surfaces. In this method, a heat insulating material is caused to flow, and air is removed from the through hole on the rear surface at the time of foaming to fill the space between the outer box and the inner box and the inside of the partition wall with the foamed heat insulating material.

The foamed heat insulating material flowing into the interior of the partition wall from the through holes on both sides is filled into the partition wall without being filled by the function of bleeding air from the rear hole, and the foamed heat insulating material inside the partition wall and the inner box are filled. And the foam insulating material in the space formed by the outer box are integrally connected.

According to a sixth aspect of the present invention, in accordance with the fifth aspect of the present invention, the flow of the foamed heat insulating material into the partition wall is performed through through holes on both sides provided near the front opening of the box. It is a way to make it.

By providing the through-holes on both sides near the front opening of the heat-insulating box, the foamed heat-insulating material can flow into the partition wall while having the initial low viscosity, and the through-hole provided on the back surface As a result, the foam insulation inside the partition wall is more smoothly filled.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a heat insulating box according to the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a longitudinal sectional view of a heat insulating box according to Embodiment 1 of the present invention. FIG. 2 is a rear perspective view of the inner box of the heat insulating box of the embodiment. FIG. 3 is a rear perspective view of a partition wall of the heat insulating box of the embodiment. FIG. 4 is a rear perspective view of the outer box of the heat insulating box of the embodiment. FIG. 5 is a diagram showing the state of filling the foamed heat insulating material in the cross section taken along line AA of FIG.

In FIG. 1, reference numeral 12 denotes a heat insulating box, which is an outer box 13 formed by bending a steel plate, an inner box 14 formed by extruding ABS into a sheet and then vacuum forming, and a polyol 15 between a polypropylene partition wall 15. And the isocyanate are mixed, and the foamed heat insulating material 16 obtained by the chemical reaction is filled and foamed. A plurality of storage sections 17 and 18 are formed vertically by the partition wall 15.

In FIG. 2, the inner box 14 made of ABS is used.
Has a substantially U-shaped groove 19 for fitting a polypropylene partition wall 15 at the same time as vacuum forming.
A plurality of through holes 20 through which the foamed heat insulating material flows are formed on both side surfaces of the groove 19, and a plurality of through holes 21 through which air is released from the foamed heat insulating material are formed at the rear surface by press molding.

In FIG. 3, the partition wall 15 is the upper partition member 2.
2, the lower partition member 23 is fitted.
On both sides of the inner box 14, there are provided through holes 24 through which the foamed heat insulating material flows so as to face the through holes 20 provided on both sides of the groove 19 of the inner box 14.

The inner box 14 is provided on the back of the lower partition member 23.
A through hole 25 for venting air at the time of foaming is provided so as to face the through hole 17 provided on the back surface of the groove portion 19 of FIG. It should be noted that the partition wall 15 is not a specification in which the upper partition member 22 and the lower partition member 23 are fitted to each other.
It is also possible to form a through hole 24 through which the foamed heat insulating material flows and a through hole 25 through which air is released during foaming.

In FIG. 4, an injection hole 26 for injecting the foam heat insulating material 16 and an air vent hole 27 of the foam heat insulating material are formed on the back surface of the outer box 13 made of steel plate by press molding.

A method of manufacturing the heat-insulating box having the above configuration will be described.

First, an ABS plate (not shown) extruded into a sheet shape is placed in the inner box 1 so that the groove 19 is formed at the same time.
4 is vacuum formed. Next, a through hole 20 through which the foamed heat insulating material flows into the side surface of the groove 19 and a through hole 21 through which air is released from the foamed heat insulating material are formed on the back surface by press molding.

As described above, the inner box provided with the through hole 20 for allowing the foamed heat insulating material to flow into the groove 19 and the through hole 21 for venting the air, and the injection hole 26 and the air vent hole 27 of the foamed heat insulating material 16 are provided on the back surface. And fitted into the outer box 13 formed by bending a steel plate.

Then, a box body in which the inner box 14 is fitted in the outer box 13 is provided with a through hole 20 provided in the inner box 14 so as to be opposed to the through hole 20 and the through hole 21 into which the foam insulating material flows. Lower partition plate 23 having through holes 21 for venting foam insulation
Then, the partition wall 15 in which the upper partition plate 22 is fitted is inserted into the groove 19 of the inner box 14. In this way, preparation for injection of the foamed heat insulating material 16 is completed.

When the prepared box body is set in a foaming jig (not shown) with its front opening facing downward, and the foamed heat insulating material 16 is injected through an injection hole 26 provided on the back side of the box body,
Through holes 20 on both sides of groove 19 and through holes 2 on both sides of partition wall
The foamed heat insulating material 16 flows into the partition wall 15 from the inside 4, and the foam heat insulating material 16 is uniformly filled while removing air from the through hole 21 on the back surface of the groove 19 and the through hole 25 on the back surface of the partition wall 13. At the same time, the space formed by the outer box 13 and the inner box 14 is filled with the foamed heat insulating material 16 while bleeding air from the air vent hole 27 on the back of the outer box. After a predetermined time, the heat insulating box 12 is completed by removing it from the foaming jig (not shown).

Here, how the foam insulating material 16 is placed in the space formed by the inside of the partition wall 15 and the inner box 14 of the outer box 13.
Filling will be described with reference to FIG.

The injected foam insulating material 16 foams upward from the fitting portion of the outer box 13 and the inner box 14 while gradually increasing the viscosity. Further, the foam heat insulating material 16 flows into the inside of the partition wall 13 through the through hole 20 on the side surface of the groove 19 and the through hole 21 on the side surface of the partition wall, and is filled with foam. The venting of the foamed heat insulating material 16 in the partition wall 15 is performed through a through hole 21 provided on the back of the groove 19 and a through hole 25 provided on the back of the partition wall.
3 and the inner box 14 are vented from the outer box 13
This is performed by an air vent hole 27 provided in the air outlet. The flow path of the air vent at this time is indicated by an arrow. As described above, the foamed heat insulating material 16 fills the space formed by the inside of the partition wall 15 and the outer box 13 and the inner box 14 without previously incorporating the internal foamed heat insulating material into the partition wall 15 as before. Is done.

Since the through holes 20 and 24 for initially flowing into the partition wall 15 are provided in the vicinity of the fitting portion between the outer box 13 and the inner box 14, that is, in the vicinity of the front opening of the box, foaming is performed. The heat insulating material 16 can flow into the partition wall 15 while the viscosity is low,
The filling amount of the foam heat insulating material 16 inside the partition wall 15 can be reduced. In addition, the surface can be smoothly filled without voids or convulsions, and does not cause deformation of the appearance or decrease in heat insulation. Further, the injection amount can be arbitrarily changed only by changing the size of the injection holes 20, 24.

In the heat insulating box 12 manufactured by such a manufacturing method, the inner box 14 and the partition wall 15 are firmly adhered to each other by the foam heat insulating material 16 through the through holes 20 and the through holes 24, so that a strong structural strength is obtained. Can be At the same time, the heat insulation of the upper and lower storage sections 17 and 18 of the partition wall 15 is also improved, and the cooling efficiency when the heat insulating box 12 is used as a cooling storage such as a refrigerator is increased. Further, it is possible to increase the storage volume by making the partition wall 15 thinner.

(Embodiment 2) FIG. 6 is a view showing a state in which a foam insulating material is filled in a partition wall according to Embodiment 2 of the present invention.

In FIG. 6, reference numeral 28 denotes a heat insulating box,
9 is an inner box. Reference numeral 30 denotes a substantially U-shaped groove formed in the inner box 29.
Are formed. Reference numeral 33 denotes a partition wall attached to the groove 30 of the inner box, and a through hole 34 facing the through hole 31 of the groove and a through hole 35 facing the through hole 32 of the groove are provided on both sides. Have been.

Here, the through holes 31 on both sides of the groove are set smaller than the through holes 34 on both sides of the partition wall, and when the partition wall 33 is viewed from the inner box 29 side, the through holes 31 pass through the through hole 31. It is arranged and configured so that the outer peripheral edge of the hole 34 is not visible. In addition, the combination of the through holes 32 and 35 on the back surface functions as an air vent hole when the heat insulating material is foamed. The basic structure and manufacturing method of the heat insulating box 28 of the present embodiment are the same as those of the first embodiment.

In the above-described configuration, even if the through holes 31 and the through holes 34 only abut each other, a part of the foamed heat insulating material 16 is partially removed from the through holes 3 in the inner box as shown by the broken arrows.
1 and does not pass through the through hole 34 of the partition wall, and there is little leakage between the groove 30 of the inner box and the partition wall 33.

Therefore, by adjusting the size and arrangement position of each of the through holes 31 and 34, the foam insulation 16
Can be prevented from leaking in large amounts and coming out to the storage compartments 17 and 18 side. Also, by appropriately adjusting the size difference between the through holes 31 and the through holes 34, the amount of leakage can be delicately controlled, and the adhesion between the inner box 29 and the partition wall 33 by the foamed heat insulating material 16 is further enhanced to provide heat insulation. The strength of the box 28 can be further enhanced.

(Embodiment 3) FIG. 7 is a sectional view of a partition wall according to Embodiment 3 of the present invention. In FIG. 7, reference numeral 36 denotes a heat insulating box, and 37 denotes an inner box. Reference numeral 38 denotes a substantially U-shaped groove formed in the inner box 37. A through hole 39 is formed on both sides and a through hole 40 is formed on the back surface. Reference numeral 41 denotes a partition wall attached to the groove 38 of the inner box, and a through hole 42 facing the through hole 39 of the groove and a through hole 43 facing the through hole 40 of the groove are provided on both sides. Have been.

Here, the through holes 39 on both sides of the inner box and the through holes 42 on both sides of the partition wall are arranged so as to be shifted from the same line in the front-rear direction of the heat insulating box 36. In addition, the through hole 40 on the back surface
The combination of and 43 acts as an air vent when foaming the insulation. The basic structure and the manufacturing method of the heat insulating box 36 of the present embodiment are the same as those of the first embodiment.

In the above-described configuration, the foamed heat insulating material 16 tends to shrink, especially when the heat insulating box 36 is placed in a low-temperature environment. 13 foam insulation 1 for inner surface
6, the thickness of the through holes 39 and 4 is particularly reduced.
It is possible to reduce the amount of partial dent of the outer box 13 that is likely to occur when 2 is large. Therefore, the heat insulating box 36
Has the effect of not impairing the side appearance.

[0051]

As described above, according to the first aspect of the present invention, the through holes are provided on both sides and the back surface of the inner box groove and the partition wall, and the through holes on both sides are filled with the foamed heat insulating material. Since the holes and the through holes on the back side are air vent holes, the inside of the partition wall is filled with foam insulation with a simple structure without having to incorporate the internal foam insulation material in advance in the partition wall, and the partition wall and inner box are strong. To increase the structural strength of the heat-insulating box. At the same time, the heat insulating property of the partition wall is improved, and the cooling efficiency when the heat insulating box is used as a cooling storage such as a refrigerator is increased. Further, it is possible to increase the storage volume by reducing the thickness of the partition wall.

Hereinafter, in addition to the common effect of the common configuration according to the first aspect of the present invention, the effect of each claim will be described.

According to a second aspect of the present invention, in the first aspect of the present invention, at least a pair of through holes on both side surfaces are provided near the front opening of the box, so that the foamed heat insulating material has a low viscosity. The inside of the partition wall can flow into the inside, and the foam insulation inside the partition wall can be smoothly filled. For this reason, the amount of foam filling inside the partition wall can be reduced, and voids and convulsions which are likely to occur on the surface of the foam heat insulating material do not occur, and the appearance does not change and the heat insulating property does not decrease.

According to a third aspect of the present invention, in the first or second aspect, the through holes on both sides of the inner box groove are smaller than the through holes on the side surfaces of the partition wall. The leakage of the foamed heat insulating material that has passed through between the groove and the partition wall without passing through the through hole of the partition wall can be suppressed. In addition, by adjusting the size and location of each through-hole, the leakage of foam insulation can be controlled, and a large amount of leakage can be prevented, and a small amount of leakage enhances the tightness of the inner box and partition wall to increase structural strength. It can be even higher.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the opposed through-holes on both sides are shifted from the same line in the front-rear direction of the heat-insulating box. When placed underneath, the amount of partial dent of the outer box caused by the shrinkage of the foam insulation can be reduced, and the aesthetic appearance is not impaired.

According to the fifth aspect of the present invention, a partition wall having a through hole provided so as to oppose the through hole provided on both sides and the back surface of the groove of the inner box can be inserted into the groove of the inner box. With the front opening of the box facing down, foam insulation is injected from the injection hole provided on the back of the box, and the foam insulation flows into the partition wall from the through holes on both sides of the inner box and the partition wall, Since the air of the foam insulation is evacuated from the through holes on the back of the inner box and the partition wall and filled with the foam insulation, the insulation box body is manufactured. Therefore, even if the internal foam insulation is not incorporated in the partition member in advance, it is simple. The inside of the partition wall is filled with a foamed heat insulating material by a simple method, and the partition wall and the inner box are firmly joined without gaps, so that a heat insulating box body having a large structural strength can be manufactured.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the flow of the foamed heat insulating material into the partition wall is performed through through holes on both sides provided near the front opening of the box. Therefore, the foamed heat insulating material can flow into the partition wall while having a low viscosity, and the foam heat insulating material inside the partition wall can be smoothly filled. For this reason, the amount of foam filling inside the partition wall can be reduced, and a heat insulating box body that does not generate voids or convulsions that easily occur on the surface of the foam heat insulating material and does not cause deformation of the appearance or decrease in heat insulating property is manufactured. it can.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a heat insulating box according to a first embodiment of the present invention.

FIG. 2 is a rear perspective view of the inner box of the heat insulating box of the embodiment.

FIG. 3 is a rear perspective view of a partition wall of the heat insulating box of the embodiment.

FIG. 4 is a rear perspective view of the outer box of the heat insulating box of the embodiment.

FIG. 5 is a diagram showing a state of filling with a foamed heat insulating material in a cross section taken along line AA of FIG.

FIG. 6 is a diagram showing a state in which a foam insulating material is filled in a partition wall of a heat insulating box according to a second embodiment of the present invention.

FIG. 7 is a sectional view of a heat insulating box according to a third embodiment of the present invention in a partition wall.

FIG. 8 is a longitudinal sectional view of a conventional heat insulating box.

FIG. 9 is a rear perspective view of the inner box of the conventional heat insulating box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Insulated box 13 Outer box 14 Inner box 15 Partition wall 16 Insulating foam 19 Groove 20 Through hole 21 Through hole 24 Through hole 25 Through hole 28 Insulated box 29 Inner box 30 Groove 31 Through hole 32 Through hole 33 Partition wall 34 Through-hole 35 Through-hole 36 Insulated box 37 Inner box 38 Groove 39 Through-hole 40 Through-hole 41 Partition wall 42 Through-hole 43 Through-hole

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Mogi 4-5-2-5 Takaida Hondori, Higashi Osaka City, Osaka Prefecture Inside Matsushita Refrigerating Machinery Co., Ltd. Matsushita Refrigeration Machine Co., Ltd. F term (reference) 3L102 JA01 LB01 LB03 LB10 LB13 MA01 MB09 MB10

Claims (6)

[Claims] 1. A box body comprising an outer box and an inner box, a groove formed on both sides and a back surface on the inner surface of the inner box, and the outer peripheral portions on both sides and the back surface are engaged with the groove. In the case where a partition wall for partitioning the body into a plurality of sections is provided, opposed grooves are provided on both sides and the back surface of the groove and the partition wall, and the through holes on the both sides are used as inflow holes for the foamed heat insulating material. A heat insulating box, wherein a foamed heat insulating material is filled between the outer box and the inner box and in the partition wall, with the through hole on the back surface serving as an air vent hole during foaming. 2. The heat insulating box according to claim 1, wherein at least a pair of through holes on both side surfaces are provided near a front opening of the box. 3. The heat insulating box according to claim 1, wherein the through hole in the groove of the inner box is smaller than the through hole in the partition wall. 4. The heat-insulating box body according to claim 1, wherein the opposed through-holes on both side surfaces are displaced from the same line in the front-rear direction of the box body. 5. A box comprising an outer box and an inner box, an injection hole for foamed heat insulating material provided on the back of the box, a groove formed on both sides and the back on the inner surface of the inner box, A partition wall is attached to the groove by engaging the outer peripheral portions on both sides and the rear surface, and a partition wall for partitioning the inside of the box into a plurality of sections, and through holes opposed to both sides and the rear surface of the groove portion and the partition wall are provided. In the one, with the front opening of the box facing downward, foam insulation is injected from the injection hole on the back of the box, and the foam insulation is allowed to flow into the partition wall from the through holes on both side surfaces, A method for manufacturing a heat-insulated box, characterized in that a foamed heat-insulating material is filled between the outer box and the inner box and inside the partition wall by bleeding air at the time of foaming from the through hole on the back surface. 6. The heat-insulating box body according to claim 5, wherein the foamed heat-insulating material flows into the partition wall through through holes on both sides provided near the front opening of the box body. Production method.