JPH09210544A - Thermal insulating box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a productivity of an inner box by a method wherein the bottom surface of the inner box is inclined in a low orientation toward a drain hole and some rectangular recesses are formed at side surfaces of the inner box. SOLUTION: This thermal insulating box comprises an outer box 4 made by steel plates, an inner box 2 made by steel plates assembled inside the outer box 4 while a certain space being left in it and a foamed polyurethane insulating material 6 filled between these boxes. A bottom surface 11 of the inner box 2 is formed with a drain hole 21 at its front section and the bottom surface 11 is fixed to a rear surface 7 and side surfaces 8 while it is being inclined forwardly in a low orientation toward the drain hole 21. In addition, a rectangular recess extending from a lower edge of the rear surface 7 to the upper side is also formed at the lower end of the rear surface 7. With such an arrangement as above, it is not necessary to align the lower end of each of the side surfaces with the inclination of the bottom surface and cut in a slant orientation, resulting in that a productivity of the inner box can be improved remarkably and a manufacturing cost of the thermal insulating box can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-insulating box body formed by foaming and filling a heat-insulating material between an outer box and an inner box made of steel plates, and more particularly to an inner box whose bottom surface is inclined downward toward a drainage hole. It is a thing.

[0002]

2. Description of the Related Art Conventionally, a heat insulating box constituting a main body of a low temperature showcase or a refrigerator is disclosed in, for example, Japanese Patent Publication No. 7-96991.
As disclosed in Japanese Unexamined Patent Publication (F25D23 / 08), a heat insulating material such as polyurethane foam is filled between the outer and inner boxes made of a steel plate by an in-situ foaming method.

In this case, for example, in the case of a heat insulation box of a low temperature showcase, in order to discharge water (condensation water, water spilled from articles, etc.) generated in a storage chamber formed in the inner box, A drainage hole is formed on the bottom surface of the inner box, and the bottom surface of the inner box is inclined downward toward the drainage hole. The rear perspective view of the inner box 101 of the conventional heat insulation box which concerns on FIG. 6 is shown. In the inner box 101 of the embodiment, a back surface 102 and left and right side surfaces 103 and 104 are formed by bending a single steel plate, and the back surface 102 and the side surfaces 103 and 104 are formed.
A bottom surface 106, which is also made of a steel plate, is screwed to the bottom portion of 4, and a top surface (not shown) is attached to the top portion.

A drain hole (not shown) is formed in the front part of the bottom surface 106, and the bottom surface 106 is inclined downward toward the drain hole. The water generated on the inner surface of the inner box 101 flows down toward the drain hole due to the inclination of the bottom surface 106 and is discharged. On the other hand, the lower ends of the back surface 102 and the left and right side surfaces 103 and 104 are aligned with the rear edge and the left and right edge portions of the bottom surface 106, and accordingly, the back surface 10 concerned.
2 and the left and right side surfaces 103 and 104 are formed, N
The edge portion (P1 and P2 portions) of the original steel plate shown by the chain double-dashed line in FIG.

[0005]

As described above, since the lower ends of the back surface 102 and the left and right side surfaces 103, 104 of the inner box 101 are conventionally formed along the inclination of the bottom surface 106,
In particular, the lower ends of the left and right side surfaces 103 and 104 had to be cut obliquely by gradually feeding a punch of an NC processing machine. Therefore, processing (cutting) takes time,
It had poor productivity.

Further, the foaming of the heat insulating material is carried out by incorporating the inner box 101 into an outer box (not shown), setting it in a predetermined jig, and injecting the polyurethane undiluted solution between both boxes in this state. However, the stock solution is a viscous liquid,
There is also a problem that the filling degree of urethane varies depending on the position from the position where the undiluted solution is injected because the space is filled between the boxes while foaming.

The present invention has been made to solve the above-mentioned conventional technical problems, and an object of the present invention is to provide a heat-insulating box body in which the productivity of the inner box and the filling property of the heat insulating material are improved. .

[0008]

The heat insulating box body of the present invention is formed by foaming and filling a heat insulating material between an outer box and an inner box made of a steel plate, and the bottom surface of the inner box faces the drain hole. Along the side wall of the inner box, which is slanted low and is below the bottom surface, a rectangular cutout is formed. According to the present invention, since the rectangular notch is formed on the side surface which is the lower side of the bottom surface of the inner box, it is not necessary to cut the side surface lower end obliquely in conformity with the inclination of the bottom surface as in the conventional case, It is possible to significantly improve the productivity of the inner box and reduce the manufacturing cost of the heat insulating box.

Further, when the heat insulating material is filled, the stock solution of the heat insulating material can satisfactorily flow to the outside of the bottom surface through the notches on the side surfaces, so that the filling property of the heat insulating material is not hindered. In particular, by adjusting the size of the notch on the side surface, the flow of the stock solution can be adjusted and the heat insulating material can be uniformly filled. In addition to the above, the heat insulating box body of the invention of claim 2 has a rectangular notch formed on the back surface which is the lower side of the bottom surface of the inner box.

According to the second aspect of the present invention, in addition to the above, a rectangular notch is formed in the back surface which is the lower side of the bottom surface of the inner box. The workability can be improved when bent and formed by a steel plate. In particular, since the undiluted solution of the heat insulating material can flow to the outside of the bottom surface even from the notch on the back surface, the filling property of the heat insulating material can be further improved.

In addition to the above, the heat insulating box body according to a third aspect of the present invention is such that notches are formed on both sides of the inner box on the back surface, leaving the central portion thereof. According to the invention of claim 3, in addition to the above, notches are formed on both sides of the back surface of the inner box, leaving the central portion thereof, so that the flow resistance of the heat insulating material stock solution is relatively low. It is possible to make the fluidity of the stock solution on both sides of the box uniform and to fill the heat insulating material between the boxes more uniformly.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a perspective view of a low temperature showcase 1 to which the present invention is applied, FIG. 2 is a vertical side view of the low temperature showcase 1 (bottom), FIG. 3 is a sectional view taken along the line AA of FIG. 2, and FIG. Is a rear perspective view of FIG. 5, and FIG. 5 is a side view of the inner box.

The low temperature showcase 1 is composed of a vertically elongated heat insulating box 3 having a front opening, and the heat insulating box 3 has an outer box 4 made of a steel plate and a space in the outer box 4. It is composed of an inner box 2 made of a steel plate incorporated therein and a foamed polyurethane heat insulating material 6 filled between the two boxes 4 and 2 by an on-site foaming method. In the inner box 2 of the embodiment, the back surface 7 and the left and right side surfaces 8 and 9 are bent and formed by an integrated steel plate, and the bottom surface of the back surface 7 and the side surfaces 8 and 9 is also a steel plate bottom surface. 11 is screwed, and a top surface 12 made of a steel plate is screwed to the top portion. And this inner box 2
The inside becomes a storage room 13.

In the storage chamber 13, a cooler (not shown) and a blower, which are not shown, are installed, and a plurality of net shelves 14, ... The front opening of the storage chamber 13 is openably and closably closed by a glass door 16 pivotally supported on one side of the heat insulating box 3. On the other hand, the base leg angles 17, 17 are provided on both sides of the lower part of the heat insulating box 3.
A machine room 18 for installing the compressor and condenser of the cooling device is provided between the angles 17 and 17.
Is configured. Further, a drain tray 19 having an opening on the upper surface is also installed in the machine room 18.

On the other hand, the bottom surface 11 of the inner box 2 is provided with a drainage hole 21 in the front portion, and the bottom surface 11 is inclined downward toward the drainage hole 21 so that the rear surface 7 and the left and right side surfaces 8,
9 attached. A drain socket 22 that penetrates the heat insulating box 3 to the outer box 4 is connected to the drain hole 21. Further, a drain hose 23 is further connected to the drain socket 22, and the drain hose 23 opens above the drain tray 19 in the machine room 18.

Condensed water generated on the inner surface of the inner box 2 and water spilled from the product flow down toward the drain hole 21 due to the inclination of the bottom surface 11, and the drain socket 22 and the drain hose 23.
After that, it is dropped and discharged into the drainage tray 19. The back surface 7 and the left and right side surfaces 8 and 9 of the inner box 2 extend below the bottom surface 11. Especially, since the bottom surface 11 is inclined, the lower ends of the side surfaces 8 and 9 are located at the bottom of the rear part rather than at the front part. It will be separated downward.

Then, at the rear ends of the lower ends of the left and right side surfaces 8 and 9, a rectangular notch 3 is formed which extends upward from the lower edges thereof.
1 and 32 are respectively formed, and a rectangular notch 3 which is formed at the lower end portion of the back surface 7 and which extends upward from the lower edge thereof.
3, 33 are formed. In this case, the notches 31 and 32 on the side surfaces 8 and 9 are formed so that the front upper corners of the notches 31 and 32 match the lower surface of the bottom surface 11, so that the notch 32 on the rear side is higher and lower than the notch 31 on the front side. The dimensions are large. In addition, the lower end of the back surface 7 has notches 33, 33 on both sides thereof, leaving a central portion.
Is formed, and the upper ends of the notches 33, 33 are similarly dimensioned to match the lower surface of the bottom surface 11.

As described above, in the present invention, the bottom surface 11 of the inner box 2 is
Rectangular notches 31 and 32 on the left and right side surfaces 8 and 9 that are the lower side of
Since it is formed, it is not necessary to obliquely cut the lower ends of the side surfaces 8 and 9 in conformity with the inclination of the bottom surface 11 as in the conventional case, and the productivity of the inner box 2 can be remarkably improved.
Further, since the rectangular cutouts 33, 33 are also formed on the back surface 7 below the bottom surface 11 of the inner box 2, the back surface 7 and the side surfaces 8, 9 of the inner box 2 are integrated as in the embodiment. This is advantageous when bent and formed by a steel plate.

Here, when the heat insulating material 6 is filled, the two boxes 4 and 2 are combined and set in a predetermined jig (not shown) with their openings facing up, as shown in FIG. For example, the polyurethane undiluted solution is injected between the boxes 4 and 2 by the injection nozzle N from the upper right of the outer box 4.
Therefore, the undiluted solution reaches the outside of the bottom surface 11 of the inner box 2 far from the injection position at a relatively slow stage,
In the present invention, the notches 33 on the back surface 7 and the side surfaces 8 and 9 of the inner box 2,
Since the undiluted solution of the heat insulating material 6 can satisfactorily flow to the outside of the bottom surface 11 from 33, 31, 32 as indicated by arrows in FIG. 3, the filling property of the heat insulating material 6 is not hindered.

In particular, the left side surface 8 farthest from the injection position
If the front and rear dimensions of the cutouts 31, 32 at the lower end of the are larger than those of the cutouts 31, 32 on the right side surface 9, the fluidity of the stock solution can be precisely adjusted and the heat insulating material 6 can be uniformly filled. In particular, the back surface 7 of the inner box 2 has notches 33, 33 formed on both sides of the heat insulating material 6 except for the central portion thereof.
It is possible to make uniform the fluidity of the undiluted solution on the lower end center part of the back surface 7 where the flow resistance of the undiluted solution is relatively small and on both sides thereof, and to fill the heat insulating material 6 between the boxes 4 and 2 more uniformly. Will be able to.

In the embodiment, the back 7 and the left and right side surfaces 8 and 9 of the inner box 2 are bent and formed by an integral steel plate. However, the present invention is not limited to this. But it doesn't matter. Further, the present invention is effective not only in the low temperature showcase of the embodiment but also in a heat insulating box such as a refrigerator for home and business use.

[0022]

As described above in detail, according to the present invention, since the rectangular notch is formed on the side surface which is the lower side of the bottom surface of the inner box, the side surface is matched with the inclination of the bottom surface as in the conventional case. Since it is not necessary to cut the lower end diagonally, it is possible to significantly improve the productivity of the inner box and reduce the manufacturing cost of the heat insulating box.

Further, when the heat insulating material is filled, the stock solution of the heat insulating material can satisfactorily flow to the outside of the bottom surface through the notches on the side surfaces, so that the filling property of the heat insulating material is not hindered. In particular, by adjusting the size of the notch on the side surface, the flow of the stock solution can be adjusted and the heat insulating material can be uniformly filled. Further, according to the invention of claim 2, in addition to the above, a rectangular cutout is formed on the back surface which is the lower side of the bottom surface of the inner box. Thus, the workability can be improved when bending is formed. In particular, the undiluted solution of the heat insulating material can flow to the outside of the bottom surface even from the notch on the back surface, so that the filling property of the heat insulating material can be further improved.

Further, according to the invention of claim 3, in addition to the above, since the notch is formed on both sides of the inner box on the back surface of the inner box, leaving the central portion thereof, the flow resistance of the heat insulating material stock solution is relatively small. It becomes possible to make the fluidity of the undiluted solution in the central part of the lower end of the back surface and both side parts thereof uniform, and it becomes possible to more uniformly fill the heat insulating material between both boxes.

[Brief description of drawings]

FIG. 1 is a perspective view of a low temperature showcase to which the present invention is applied.

FIG. 2 is a vertical cross-sectional side view of a low temperature showcase (lower part).

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a rear perspective view of the inner box.

FIG. 5 is a side view of the inner box.

FIG. 6 is a rear perspective view of a conventional inner box.

[Explanation of symbols]

 1 Low Temperature Showcase 2 Inner Box 3 Insulation Box 4 Outer Box 6 Insulation 7 Back 8, 9 Side 11 Bottom 31, 32, 33 Notch

Claims (3)

[Claims] 1. A heat-insulating box body formed by foaming and filling a heat-insulating material between an outer box and an inner box made of steel plate, wherein the bottom surface of the inner box is inclined downward toward the drain hole, and
A heat-insulating box body, characterized in that a rectangular cutout is formed on a side surface of the inner box which is a lower side of the bottom surface. 2. The heat insulating box body according to claim 1, wherein a rectangular notch is formed on a back surface which is a lower side of a bottom surface of the inner box. 3. The heat-insulating box body according to claim 2, wherein notches are formed on both sides of the back surface of the inner box, leaving a central portion thereof.