JPH031126B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for manufacturing foam walls used in insulating boxes for refrigerators, low-temperature storage cases, and the like.

(b) Prior art In general, Japanese Patent Publication No. 18585-18585 and Japanese Patent Publication No. 1858-1858
The low-temperature case with one side open, as shown in Publication No. 53179, has a main body made of an insulating wall with one side open, and a partition plate is provided at an appropriate distance from the inner wall of the insulating wall to cool the case. A circulation path in which a container and a blower fan are arranged, and a storage room are formed.

Up until now, the insulation wall was constructed by inserting a wooden frame made of square timber into the space between the inner and outer plates as a framework, and filling it with a heat insulating material made of glass wool. As shown in Japanese Patent Publication No. 104062/1983, a foamed insulation material such as hard polyurethane was used instead of glass wool, and an attempt was made to shorten the manufacturing time per case and significantly reduce costs. ing.

(c) Problems to be solved by the invention However, in the above-mentioned prior art, the metal inner plate used at the bottom of the insulating wall is a single piece in consideration of cold air circulation, dew treatment, etc. It had one to several bending lines. Therefore, the inner plate does not stick well to the foam insulation material, that is, it has a length that receives the adhesive force of the foam insulation material two-dimensionally, and the inner plate is not supported by the foam insulation material to the extent expected to increase its strength. I couldn't.

In other words, in this type of show case, after the insulating wall is fabricated, workers enter the space surrounded by the insulating wall to install coolers, fan cases, etc., and perform various tasks while standing on the bottom of the case. , Similarly, even after the show case is completed, in order to perform maintenance and inspection work on the cooler and blower, the load of the worker is directly applied to the inner plate at the bottom, and this load causes the inner plate to dent downward, resulting in These dents caused problems such as hindering the distribution of circulating cold air, forming dew pools, and reducing the heat insulating effect of the bottom, resulting in dew condensation on the outer panel surface.

(d) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a foamed wall 16 in which the gap between the inner and outer plates 20 and 21 is filled with a foamed heat insulating material 22. One of the members 27, 2 has bent flanges 34, 35 formed on at least one end edge thereof facing toward the foamed heat insulating material.
8, and a holding portion 36, which is oriented toward the foamed heat insulating material at an edge adjacent to the edge and defines a groove 38 for storing a sealing agent 39 made of silicone having adhesiveness and elasticity in the flange; The holding parts 36 and 37 are caulked with the flange and sealing agent stored in the grooves, and the respective members are connected to each other to form an internal structure. After constructing the plate 20 and covering the seam between the tips of the holding parts 36 and 37 and the one member with the band member 41, both the inner and outer plates 2 are assembled.
To provide a method for manufacturing a foamed wall in which a foamed heat insulating material 22 is injected into a gap between 0 and 21 and foamed and solidified.

(E) Function Flanges 34, 35 and adhesive sealant 39
Each member 2 is stored in the grooves of the holding parts 36 and 37, and the holding parts are caulked.
Sealing can be done at the same time as connecting 7, 28, 29,
The inner plate 20 can be manufactured easily, and the flanges 34, 35 and the holding parts 36, 37 serve as reinforcing strips for the inner plate 20, improving the mechanical strength of the inner plate 20. , 37 bite into the foam insulation material 22 three-dimensionally, and the inner plate 20 and the foam insulation material 22
This improves the bonding strength with the band member 41 during foaming.
This prevents the oxime gas generated from the silicone sealant 39 from coming into contact with the foamed heat insulating material 22.

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

In the figure, reference numeral 1 denotes a low-temperature case whose main body is made up of an insulating wall 3 with an opening 2 for loading and unloading products on the front, and a removable bottom wall 4A located at an appropriate distance from the inner wall of the insulating wall. By arranging a partition plate 4 with
A storage chamber 11 in which 0 is placed, and outlet and suction ports 12 and 13 facing each other along both upper and lower edges of the opening are formed, and the cold air heat-exchanged by the cooler is sent to the air blower fan 8. The storage chamber 11 is cooled by forced circulation as shown by the arrow in FIG. 2 to form a cold air curtain AC in the opening 2.

The heat insulating wall is divided into a plurality of parts including a top part, a central part,
It consists of foamed walls 14, 15, and 16 at the bottom, and is assembled by abutting against each other grooves 17 or ridges 18 formed on at least one of the adjacent connecting edges of each foamed wall. still,
During this butting, as shown in FIG. 1, a heat insulating packing 19 made of rubber or resin is interposed between the two adjacent foam walls. Each of the foamed walls is made up of both inner and outer metal plates 20, 21, and a foamed heat insulating material 22 made of hard polyurethane or the like filled in the gap between the two plates.

The foam wall 16 at the bottom of each of the foam walls has both inner and outer plates attached to the upper edge of the front wall 16A, which is the lower edge of the opening 2.
0 and 21 are adiabatically separated from each other, and a handrail 23 made of wood powder-containing resin is arranged, which also serves as a reinforcing material for the upper edge, and a drain port 24 is connected to the drain port on the bottom wall 16B. A heat insulating block 26 made of foamed polystyrene is arranged to support the drain pipe 25. The inner plate 20 of this foam wall includes front and rear members 27 made of, for example, hot-dip galvanized steel plate (abbreviated as SPG).
28, and a central member 29 which is made of a stainless steel plate with excellent corrosion resistance and acts as a gutter. The bottom wall portions 30 and 31 of both the front and rear members are connected to the center member 29.
The central member 29, which has a drain port 24 formed in the center thereof, has an inclined portion 32 that slopes downward toward the rear toward the drain port, and a slope portion 32 that slopes downward toward the front toward the drain port. Inclined rear inclined part 33
Furthermore, the edges of the front and rear inclined portions 32, 33 abut against the edges of the opposing bottom wall portions 30, 31, respectively, and are lower than the edges.

Reference numerals 34 and 35 indicate downward flanges formed by bending the edges of both bottom wall portions 30 and 31, respectively, and the lower ends thereof include bent pieces 34A that protrude in the front or rear direction.
35A is formed. Reference numerals 36 and 37 denote holding portions formed at the edges of both the front and rear inclined portions 32 and 33, respectively, which define grooves 38 for storing and holding the downward flange and a sealant 39 made of silicone caulk, as shown in FIG. has been completed. This holding part is the fifth
It is bent and formed in each step shown in Figures A to C. That is, as shown in FIG.
, and after embedding the bent piece 34A of the downward flange 34 in this sealant, the tip of the holding portion 36 is rotated in the direction of arrow A using the lower end of the downward flange 34, that is, the bent piece 34A as a fulcrum, as shown in B. The front member 27 and the central member 29 are deformed by pressing the sealant 39 to form the groove 38, and then the front member 27 and the central member 29 are crimped from the direction of arrow B as shown in C.
A swage 40 is formed to interconnect the bulging portion 36 formed by the bent piece 34A on a part of the holding portion 36.
A is formed, and at the same time, a widened portion 38A is formed in a part of the groove 38, in which the amount of the sealant filled is increased. The other holding part 37 is also processed and formed in the same way, and in addition to the groove 38 and the caulking part 40, it has a bulging part 37A,
A widened portion 38A is formed. Furthermore, by this processing and forming, both the front and rear members 27, 28 and the central member 29 are
In the case where the above-mentioned paragraph is applied between The bending widths L and M are set so that the surfaces of the bottom wall portions 30 and 31 are always at a higher position than the surface of the central member 29. In this embodiment, the bottom wall portions 30, 3 of both the front and rear members 27, 28
1, the downward flanges 34, 35 and the holding parts 36, 37 are formed on both the front and rear inclined parts 32, 33 of the central member 29. Downward flanges 34 and 35 may be formed on both inclined portions 32 and 33.

Reference numeral 41 denotes a band-shaped member that covers the seam between the tips of the holding parts 36, 37 and the front and rear members 27, 28 along the longitudinal direction thereof, and is made of a suitable material such as adhesive tape, and is made of a sealant 39 and foamed material. Contact with the heat insulating material 22 is prevented. Reference numeral 42 designates a suitable number of drain channels formed at the lower end of the fan case 7 near the drain port 24, which guides dew dripping from the cooler 6 and flowing into the high pressure area below the fan case 7 to the drain port 24. do. 43 is a hinge that allows the fan case 7 to rotate freely in the vertical direction;
One end thereof is attached to the fan case 7, and the other end is attached to a reinforcing member 44 on which the bottom wall portion 4A of the partition plate 4 is placed. Reference numeral 45 denotes an injection port formed at a suitable location on the outer panel 21, through which the foaming solution of the foam insulation material 22 is injected into both the inner and outer panels 2.
After injecting into the gap between 0 and 21, it is also covered with a lid 46.

Describing the method of manufacturing the foamed wall 16 described above, first, as explained in FIGS.
The inner plate 20 is constructed by connecting the holding parts 36, 37 of 9 by caulking, and the band-like member 41 connects the holding parts 36, 37 with both the front and rear members 27, 28.
Seal the seam. Next, both the inner and outer plates 20,
21 are assembled to form a gap between the two plates, the two plates are fixed using both inner and outer jigs (not shown), and then a foaming stock solution is injected into the gap from the injection port 45 to foam and solidify. By forming the foamed heat insulating material 22, the desired foamed wall 16 can be obtained.

According to such a manufacturing method, the inner plate 2 of the foam wall 16
0 can be constructed using a plurality of members, that is, both the front and rear members 27, 28 and the central member 29, it is possible to use a combination of inexpensive and narrow steel materials determined by the steel material manufacturer, and the inner plate of a predetermined width can be used. 2
There is no need to order a custom-made product from a steel material manufacturer in order to obtain 0.0, it is possible to obtain an inexpensive inner plate 20, and by varying the combination width of each member 27, 28, 29, the depth width can be reduced. Different foam walls 16 can be constructed. Also, both front and rear members 2
While the flanges 34 and 35 of 7 and 28 and the adhesive sealant 39 are housed in the grooves 38 of the holding parts 36 and 37 of the central member 29, the holding parts 36 and 37 are caulked to close the crimped parts. 40 and connect these members to obtain the inner plate 20.
At the same time as connecting each member 27, 28, 29, sealing between these members can be performed, and the connection and sealing work can be performed at the same time.
With the formation of the flanges 34, 35 and the holding part 3
6 and 37 serve as reinforcing strips for the inner plate 20, which not only improves the mechanical strength of the inner plate, but also allows the holding parts 36 and 37 to be embedded in the foamed heat insulating material 22 and bite into it, that is, to serve as the inner plate 20. The foamed wall 16 is bonded three-dimensionally to the foamed heat insulating material 22, thereby increasing the strength of the foamed wall 16. In addition, the sealant 39 has adhesion, elasticity,
Since it is plastic, it can be accommodated according to the shape of the groove 38 without any hindrance to the processing of the holding parts 36, 37, and the watertightness of the butt parts between the respective members 27, 28, 29 is maintained well. Even if thermal contraction and expansion occur in each member, the watertight effect can be continuously exhibited due to the adhesiveness and elasticity of the members, and moisture intrusion into the foamed heat insulating material 22 can be prevented. Furthermore, since the band member 41 covers the joint between the holding parts 35, 36 and both the front and rear members 30, 31, the transmission from the inner and outer plates 20, 21, which are heated in advance, is prevented during foaming. It is possible to prevent the oxime gas generated from the heated silicone caulking sealant 39 from leaking into the gap between the two plates from the joint, and as a result, contact between the oxime gas and the foamed heat insulating material 22 can be prevented. This can eliminate the occurrence of foaming and unfilled areas due to oxime gas.

(g) Effects of the invention According to the present invention described above, the effects listed below are produced.

By performing caulking work on this holding part while storing the flange and sealant in the groove of the holding part, the sealant forms a shape that adapts to the shape of the groove and seals between each member at the same time as connecting each member. This not only facilitates the production of the inner plate, but also increases the mechanical strength of the inner plate since the flanges and holding portions serve as reinforcing strips for the inner plate.

The holding portion bites into the foam heat insulating material, and the inner plate and the foam heat insulating material are three-dimensionally adhesively bonded, so that the foam strength of the foam wall can be improved.

Since the strip member can prevent the oxime gas generated from the silicone sealant from coming into contact with the foamed heat insulating material during foaming, formation of unfilled portions of the foamed heat insulating material in the void can be avoided.

[Brief explanation of the drawing]

The drawings all show an embodiment of the method for manufacturing a foamed wall according to the present invention, and FIG. 1 is a vertical cross-sectional view of a main part, FIG. 2 is a vertical cross-sectional view of the entire low-temperature case, and FIG. 3 is a front perspective view of the entire heat-insulating wall. , Figure 4 is an enlarged view of Figure 1A, Figure 5
Figures A to C are vertical cross-sectional views sequentially showing the process of connecting the flange and the holding part. 16... Foam wall, 20... Inner plate, 21... Outer plate, 22... Foam insulation material, 27... Front member, 28
... Rear member, 29 ... Center member, 34, 35 ...
Flange, 36, 37...Holding portion, 38...Groove,
39... Sealing agent, 41... Band-shaped member.

Claims (1)

[Claims] 1. In a foamed wall formed by filling a gap between the inner and outer plates with a foamed heat insulating material, the inner plate has one member formed with a bent flange facing toward the foamed heat insulating material on at least one edge, and a member adjacent to the edge. At least two members including the flange and the other member forming a holding portion facing toward the foamed heat insulating material and defining a groove for storing a sealant made of silicone having adhesiveness and elasticity at an edge thereof. Then, with the flange and the sealant stored in the groove, the holding part is caulked to connect each of the above members to each other to form an inner plate, and the tip of the holding part and the one member are After covering the seam between the
A method of manufacturing a foam wall by injecting a foam insulation material into the gap between the inner and outer plates and solidifying the foam.