JPH03211383A - Inside construction of refrigerator - Google Patents

Abstract

PURPOSE:To reduce the number of parts and assembly man-hour without a need to separately prepare a rear panel and left and right side panels by a method wherein an inner box main body into which a rear panel and left and right side panels are integrated is produced in such a manner that two rectangular metallic flat plates are bent into U shapes, and their edges are brought in contact with each other and caulked to connect them together. CONSTITUTION:A flat metallic plate 5 has a pair of cuts 7 and 8 on the long side edges and is bent along the long side including the cuts to form V shape flanges 9a and 9b. A flat metallic plate 6 has a V shape flange 10 along a long side and a right angle flange 11 along the other long side. The flat metallic plates 5 and 6 are bent along lines drawn between the cuts 7 and 8 to form them into nearly U shapes, and the edges of the flat metallic plates 5 and 6 are brought in contact with each other, and the right angle flange 11 is inserted into the V shape flange 10 and caulked so that an inner box main box 1A is formed. A top board 14 and a bottom plate 15 are respectively inserted into the V shape flanges 10 on the top and the bottom of the inner box main body 1A and caulked. Thereby, the number of parts and assembly man-hour can be reduced.

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to the production of a heat insulating box for a refrigerator, and in particular, the inner box made of a steel plate can be manufactured easily and has sufficient heat insulation by reducing the amount of material required. Regarding the structure of the inner box of the refrigerator.

(b) Prior Art In general, the inner box of household refrigerators and commercial refrigerators is made of metal members (thin steel plates) joined together. That is, as shown in FIG. 7, the top plates 30a, 30b are divided into three parts,
Left and right side plates 31, 32. It is composed of five metal plates: back plates 33a, 33b, and bottom plate 34. In this case, since the height and width of a domestic refrigerator are small, it is possible to measure the dimensions by fitting it within the material width of the metal member, but in the case of a commercial refrigerator with a high inner box height, as shown in Figure 1, This exceeds the limit of the material width of the metal member, and as shown in FIG. 7, two metal members are used for the back plates 33a and 33b, increasing the amount of material required. Further, the respective sheet metals are connected to each other by stitching, screws, etc. and,
Instead of using stencils or screws, there is a method of joining each sheet metal together by caulking. For example, as shown in Japanese Utility Model Publication No. 44-5415, the inner box is constructed by caulking the mating portions of the back plate and the wall plate.

(c) Problems to be solved by the invention However, when it comes to material removal for the inner box as shown in Figure 7,
A large amount of sheet metal is required, resulting in high costs.

In addition, the number of man-hours is increased because each sheet metal is joined using stitches and screws. Furthermore, each corner of the completed inner box is partially at right angles, making it difficult to clean the inside of the inner box. Therefore, in order to create a structure that is easy to clean, it is necessary to form a bending radius in the back plate or side plate, which increases the number of man-hours and effort.

On the other hand, in Japanese Utility Model Publication No. 44-5415, when urethane foam is injected, injection is performed at appropriate locations in the space between the inner box and the outer box.

For example, when the urethane is injected between the left wall plate 5 and the outer box part facing it, the urethane flows to the right and fills the space area corresponding to the back plate 6 and the right wall plate 4, but at that time, the urethane is not caulked. Since the joint flanges of the parts protrude laterally, there is a risk that the rising (spinning) of the urethane after injection may be hindered.

The present invention has been made in view of the above points, and an object of the present invention is to provide an inner box structure for a refrigerator that is improved in terms of material costs, processing steps, insulation injection work, etc.

(d) Means for Solving the Problems The present invention provides a refrigerator box structure in which an inner box made of bonded metal members is placed inside an outer box, and a heat insulating material such as hard polyurethane is integrally foamed. A metal flat plate having a pair of notches on each side edge, and flanges on both side edges bent to include the notches are both approximately V-shaped, and one side edge is approximately V-shaped. A V-shaped flange and a flat metal plate whose other side edge is a right-angled flange are provided, and each flat metal plate is bent inwardly along a line connecting the notches to form a U-shape. The end surfaces are butted together, the approximately V-shaped flange and the right-angled flange are fitted, and then the back plate and left and right side plates are integrated to form an inner box main body, and the inner box main body is positioned above and below this inner box main body. The top plate and the bottomed peripheral edge are inserted into each of the substantially V-shaped flanges and are caulked together.

(E) Function The main body of the inner box, which has an integrated back and left and right side plates, is made by bending two oblong metal plates into a U-shape, abutting each other at their end faces, and caulking the abutting parts together. It can be composed of Therefore, it is no longer necessary to take materials for the back plate, left and right side plates, and each plate as in the past, and the number of parts and assembly man-hours can be reduced. Because the bent part has a notch formed therein, it has an R shape and is not at a right angle. Therefore, in the inner box that is created by caulking the top plate and bottom plate to the top and bottom of the main body of the inner box, the corners are aligned. The parts are also easier to clean. The rounded shape of a portion of this corner and the elimination of a joining flange at a portion of the corner ensure smooth rise of the urethane.

(f) Example Embodiments of the present invention will be described below based on the drawings.

Fig. 1 is an external perspective view of a commercial refrigerator having four storage compartments 20, and Fig. 2 is a side sectional view of the same refrigerator. (Urethane material) 3 is filled in the refrigerator main body 4, and on its top surface,
Refrigeration unit or compressor 21. Blower 22
, an upper lid 26 equipped with a condenser 23, an evaporator 24, and a cold air circulation fan 25, which distributes cold air to each storage compartment 20.
It is circulated and cooled. Open the storage floor door 27,
Items are taken out from a height-adjustable shelf 28 inside.

By the way, in a large refrigerator like this commercial refrigerator,
The height of the inner box exceeds 1400 m/m.

On the other hand, the width of the metal member forming this is at most 4 feet (1219+++/m), and the inner box consisting of the back plate and left and right side plates is made up of multiple sheets as shown in Figure 7 above. It has no choice but to be constructed from metal members.

Therefore, the present invention is constructed using a manufacturing method shown in FIGS. 3 and 4 that is simple and requires less material.

That is, by preparing two oblong metal flat plates 5 and 6, bending them into a U-shape, and joining them on the longitudinal sides, an inner box with a maximum height of 8 feet can be made. .

Next, a specific manufacturing method will be explained. First, notches 7 and 8 are provided on the longitudinal side edges of the two flat metal plates 5 and 6 at fixed distances from both ends thereof, respectively. Next, one of the flat metal plates 5 has flanges 9a and 9b formed by bending both edges in the longitudinal direction into a substantially V-shape including the notch 7. On the other hand, the other flat metal plate 6 has a substantially V-shaped flange 10 including a notch 8 at the end opposite to the abutting side, and the side edge on the other side, that is, the abutting side, is bent at a right angle. It is formed on the flange 11. Then, each metal plate 5, 6 is bent inwardly along folding lines Q, Q, 2 connecting the notches 7, 8 to form U-shaped metal plates 5, 6 as shown in FIG. In addition, the height dimension of each flange 9a, 9b, 10.11 in each metal flat plate 5, 6 is the notch 7.
, 8 or more, and the flange surface 12.1 is such that surface contact will be made when the end surfaces of both flat metal plates 5 and 6 are brought together later.
3 is formed. Thereafter, the approximately V-shaped flange 9b on the mating sides of the metal flat plates 5 and 6 and the right-angled flange 11 are fitted together and then caulked. In this way, the inner box main body IA, in which the back plate and the left and right side plates are integrated, is completed. After caulking, corner portions 12 and 13 are bent into an R shape. Both metal flat plates 5
, 6 are joined to each other by the flange surfaces 12, 1.3, so that the sealing effect is good. Finally, as shown in FIG. 4, the top plate 14 and the bottom plate 15 are inserted with their peripheral edges into the approximately V-shaped flanges 9a and 10, and then caulked.

In this way, the inner box l is completed as shown in FIG.

In addition, 16 is a drainage hole. The inner box 1 thus made is combined with the outer box 2 formed separately, and the urethane material 3 is foamed and filled between them.As shown in Figure 6, when urethane is injected from the position of the arrow, Since the flanges do not protrude sideways at a portion of each corner when going around to the back air space and the side air space as in the conventional case, the urethane 3 stands up smoothly and the foam filling of the heat insulating material is efficiently performed.

(G) Effects of the Invention According to the present invention, two horizontally long metal plates each having a pair of notches on both sides in the longitudinal direction are provided, and the side edges in the longitudinal direction including the notches are provided. One flat metal plate has both qv-shaped flanges, and the other flat metal plate has one side edge a right-angled flange.

The other side edge is formed into a substantially ■-shaped flange, and after each metal plate is bent inward along a line connecting the notches,
The V-shaped flange and the right-angled flange are fitted and caulked to create the main body of the inner box, which is made up of a back plate and left and right side plates, and a top plate and a bottom plate are placed above and below this, and the periphery is the main body of this inner box. Since the inner box is formed by inserting the inner box into the upper and lower approximately V-shaped flanges and caulking, the inner box can be made with less material than before. Furthermore, since the inner box can be manufactured without stitching or screwing, the number of man-hours can be reduced. Since both metal plates are caulked together, the sealing properties of the foam insulation material eliminate water leakage from the inner box and leakage of the foam insulation material, and there is no need to apply stickers such as tape during foaming work. Manufacturing becomes easy.

Furthermore, the joining flange of the caulked part of the inner box does not protrude to create resistance in the direction in which the urethane rises, and a portion of the corner is rounded, allowing the urethane to rise smoothly and foaming to occur efficiently. It has a similar effect.

[Brief explanation of drawings]

Fig. 1 is an external perspective view of a commercial refrigerator to which the present invention is applied, Fig. 2 is a side sectional view of the refrigerator, Fig. 3 is a process perspective view showing the manufacturing stage mainly for the inner box, and Fig. 4 is the internal An exploded perspective view of the inner box made by combining the box main body with a top plate and a bottom cutout, Figure 5 is a side sectional view of the inner box, and Figure 6 is produced by combining it with the outer box and filling it with foam insulation material. A sectional view of the refrigerator body, and FIG. 7 is an assembled perspective view of a conventional inner box. l... Inner box, IA... Inner box main body, 5, 6... Metal flat plate, 7, 8... Notch, 9a, 9b, 10. ...Substantially V-shaped flange, 11...Right angle flange, 14...
Top plate, 15...bottom plate. Figure 3 Figure 4 Figure 15 Figure 15

Claims (1)

[Claims] (1) Place the inner box made of bonded metal parts into the outer box,
In a refrigerator box structure integrally foamed with a heat insulating material such as hard polyurethane, the flanges on both sides have a pair of notches on each side in the longitudinal direction, and are bent to include the notches. are both approximately V-shaped, and metal flat plates each having a substantially V-shaped flange on one side edge and a right-angled flange on the other side edge are provided, and each metal plate is inserted into the notch. The two metal plates are bent inward at the line connecting them to form a U-shape, and the end surfaces of both metal plates are brought together, and the approximately V-shaped flange and the right-angled flange are fitted and caulked to separate the back plate, left and right sides. A refrigerator characterized in that the side plates form an integrated inner box main body, and the peripheral edges of the top plate and the bottom plate are inserted and caulked into each of the substantially V-shaped flanges located above and below the inner box main body. inner box structure.