JP2724523B2 - Thermal insulation box and method of manufacturing the same - Google Patents

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 such as a refrigerator and a method for manufacturing the same, and more particularly to a heat insulating box using a substitute for chlorofluorocarbon as a foaming agent and a method for manufacturing the same.

[0002]

2. Description of the Related Art A conventional heat insulating box such as a refrigerator will be described with reference to the drawings. FIG. 11 is a rear perspective view of the heat insulation box, and FIG.
Is a perspective view of the same appearance showing a state before filling the foamed heat insulating material, FIG. 13 is a sectional view taken along the line BB of FIG.
FIG. 14 is a cross-sectional side view showing a filling state of the foamed heat insulating material in the heat insulating box provided with the vacuum heat insulating panel.

[0003] The heat insulating box 100 includes an outer box 10, an inner box 20 mounted inside the outer box 10, and a foam insulating material 30 which fills and foams a space 21 formed by the outer box 10 and the inner box 20. It consists of The outer box 10 is formed of a steel plate or the like, has an opening on the front surface, and has a bottom plate 11, a top plate 12, a back plate 13, and both side plates sandwiching the back plate 13.
14 is formed. On the bottom plate 11, a part of the bottom plate 11 is bent to place a refrigerator
A is formed. The inner box 20 is formed by vacuum molding a resin such as ABS. The foam heat insulating material 30 is formed by foaming and solidifying a foaming stock solution 30A obtained by mixing a foaming agent with a rigid polyurethane foam (hereinafter, referred to as urethane foam).

[0004] The inner box 20 is attached to the outer box 10 as follows. That is, as shown in FIG.
20A is fitted into a flange portion 14A formed by processing the end of the side plate 14 by pressing or rolling. Further, the ear 12B of the top plate 12 and the flange 11B provided at the front of the bottom plate 11 are fitted into the flange 14A. And angle 15 for reinforcement
Is fixed to a positioning opening (not shown) formed in the bottom plate 11 together with the flange portion 14A with screws 16. On the other hand, an electrical component box 17 for installing electrical components is fitted into the top plate 12 and the side plate 14 and fixed by screws 18.

A fitting portion between the top plate 12 and the side plate 14 and a fitting portion between the bottom plate 11 and the side plate 14 are sealed with a soft urethane foam or the like so that the urethane foam does not leak. Before attaching the back plate 13 to the box 100, a hot melt injection nozzle 31 is movably inserted into the space 21 from the back side of the heat insulating box 100, and the lug 20A and the side plate 14 of the inner box 20 are inserted. The hot melt 40 is injected and applied to the fitting portion with the flange 14A. The hot melt 40 is, for example, a material obtained by heating and melting polypropylene to form a fluid, and when cooled, solidifies to exhibit an adhesive force. Part of the hot melt 40 is applied to the corners of the bottom plate 11 and the top plate 12 at both ends of the side plate 14. This prevents leakage of the foamed heat insulating material 30 and also helps to increase the strength of the heat insulating box 100.

After the back plate 13 is attached to the outer box 10 to which the inner box 20 is attached as described above, as shown in FIG. 13, the back plate 13 is arranged so that the front opening is at the bottom and the back plate 13 is at the top. And
A plurality of injection ports 32 (two in the example shown in FIG. 11) opened in the back plate 13 are used to feed the undiluted foaming solution 30A into the space 21 through an injection machine 33.
Fill and foam in the direction of the arrow, and
The generated gas is discharged from a plurality of gas vent holes 34 formed in the bottom plate 11.

As the foaming agent for the foaming stock solution 30A, CFC-11 (CFC-11) has been used.
However, chlorofluorocarbon 11 has the greatest power to destroy the stratospheric ozone layer, and its use has been banned. Therefore, HCFC-2, which has little effect on ozone depletion, is used as a substitute.
2, HFC-134a, etc. are considered to be promising and contain about 6%.

[0008]

However, in the conventional heat-insulating box body 100, the case where a vacuum heat-insulating panel 19 having a higher heat-insulating effect than the foam heat-insulating material 30 such as urethane foam is used in the space 21 or the case where the heat-insulating box is used. When attaching the related parts of the body 100, as shown in FIG. 14, these may hinder the insertion of the hot melt injection nozzle 31 from the back of the heat insulating box 100 over the entire fitting portion that requires the hot melt injection nozzle 31. May not be possible. For this reason, when the foaming stock solution 30A is injected, the foamed heat insulating material 50 may leak from a place where the hot melt 40 is not sealed.

The above-mentioned foaming agents HCFC-22 and HF
The boiling point of C-134a is very low at -40.8 ° C, compared to the boiling point of CFC-11 at 23.8 ° C. The foaming stock solution 30A is H
Even if the content of CFC-22 is about 6%, the viscosity is high,
In addition, there is a drawback that the foam is formed during foaming. Immediately after the injection of the foaming solution 30A, as shown in FIG. 13, as shown in FIG. The distance A between the top and the inlet 32 becomes very small.
Next, at the same time as the completion of the injection of the foaming undiluted solution 30 </ b> A, the foamed heat insulating material 30 which has been foamed reaches the injection port 32, and further blows out from the injection port 32. For this reason, there is a problem that unevenness of density, turbulence of bubbles, gas voids, and the like occur in the space 21.

The present invention has been made in view of the above circumstances, and in particular, has a predetermined space between both side plates of an inner box and an outer box.
In case of providing the vacuum insulation panels Te, thermally insulating box foam insulation is so as to avoid leakage Ri by the heat-insulating main body, a stable foam filling state can be obtained by using a chlorofluorocarbon alternatives foaming agent It is intended to provide a body and a method for producing the same.

[0011]

According to a first aspect of the present invention, there is provided a heat insulating box having an outer box having an opening at a front surface and comprising a bottom plate, a top plate, and both side plates, and being mounted inside the outer box. Inner box, with a predetermined spacing between the inner box and the both side plates
A vacuum insulation panel which is mounted, which comprises a filling foamed foam insulation in the space formed between the outer box and the inner box and the outer box in order to prevent the leakage of the foam insulation A heat-insulating box body in which a fitting portion with an inner box is sealed with a hot melt, wherein a plurality of hot melt inlets are provided on a bottom plate or a top plate of the outer box, and a cover or a hot melt inlet is provided. Includes non-return valve, one with decorative tape attached.

[0012] In the method of manufacturing the heat-insulating main body of the fourth aspect, an outer box which is composed of a bottom plate and top plate has an opening on the front and the back plate and side plates, attached to the inside of the outer box Inside
A method of manufacturing a <br/> insulating box body that the foam insulation is filled foam into a space portion formed in a box, and a plurality of inlets for injecting a foam insulation in the bottom plate, the space portion Foam insulation
Gas that removes the atmospheric gas in the space when injecting
Leave open the vent hole, respectively, under the top plate, so that the bottom plate is arranged so that the upper and injecting the foam insulation toward just below from the inlet.

Further, according to a fifth aspect of the present invention, there is provided a method for manufacturing a heat-insulating box body, wherein an opening is provided on a front surface, a bottom plate, a top plate, a back plate, and both sides.
An outer box consisting of a plate and attached inside the outer box
Fill and foam the foam insulation material into the space formed by the inner box
A method of manufacturing a heat insulating box, comprising:
A plurality of inlets for injecting material and foam insulation in the space
Gas for removing the atmospheric gas in the space when the material is injected
Opening holes and each hole, the opening below,
Arrange so that the back plate is on top, and
Inject foam insulation diagonally toward the surface or bottom
I am trying to.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a heat insulating box according to the present invention. 1 to 3 are drawings according to the first embodiment of the present invention. FIG. 1 is a perspective view of a rear view of a heat insulating box during hot melt injection, and FIG. 2 is a rear view of a heat insulating box showing another embodiment. FIG. 3 is a side sectional view for explaining a hot melt injection state of a heat insulating box having a vacuum heat insulating panel. 4 to 6 are drawings according to the invention of claim 4, wherein FIG. 4 is a rear perspective view of the heat insulating box during injection of the foaming undiluted solution, and FIG. 5 is a sectional view taken along line XX of FIG. 6 is a side sectional view showing a state after foam filling of the foam heat insulating material.
7 to 10 are drawings according to the fifth aspect of the present invention.
FIG. 8 is a rear view external perspective view of the heat insulating box, FIG. 8 is a sectional view taken along the line YY of FIG. 7 showing a state immediately after the injection of the undiluted foam solution, and FIG. 9 is a rear view external perspective view of the heat insulating box showing another embodiment. FIG. 10 is a sectional view taken along the line ZZ in FIG. 9 showing a state immediately after the injection of the foaming undiluted solution. Note that the same components as those in the conventional technology are denoted by the same reference numerals.

An embodiment of the first invention according to claim 1 will be described. The heat insulating box 101 of the present invention comprises an outer box 10, an inner box 20, and a foamed heat insulating material 30 as in the prior art,
The outer box 10 includes a bottom plate 11, a top plate 12, a back plate 13, and side plates 14, and further includes a vacuum heat insulating panel 19.

The vacuum heat insulating panel 19 has heat insulating property several times that of urethane foam, and is provided in a space portion 21 excluding a gap G of several cm from four sides of the side plate 14 which becomes a flow path of the foaming undiluted solution 30A. ing.

The bottom plate 11 of the heat-insulating box 101 is provided with a plurality of injection ports 111 for hot-melt injection nozzles 31. In addition, a cover 112 for closing the injection port 111 is provided on the back surface of the bottom plate 11 so as to be openable and closable. The cover 112
Has elasticity, and has one end adhered to the back surface of the bottom plate 11 by a double-sided tape (not shown). The cover 112 opens and closes by inserting and removing the hot melt injection nozzle 31, and acts as a check valve when the foam heat insulating material 30 is foamed, thereby preventing the foam heat insulating material 30 from leaking.

Next, a procedure for injecting the hot melt will be described. With the back plate 13 of the heat insulating box 101 facing upward, the hot melt injection nozzle 31 is inserted through the injection port 111. Using the gap G between the side plate 14 and the vacuum insulation panel 19, the inner box 20 moves the hot melt injection nozzle 31 close to the vicinity of the top plate 12, and applies the hot melt 40 to the fitting portion between the side plate 14 and the inner box 20. Then, the hot melt injection nozzle 31 is moved in the direction of the arrow (see FIGS. 1 and 2).

Since the fitting portion is sealed in advance with the hot melt 40 as described above, even if the foamed heat insulating material 30 is filled and foamed in a later step, the foamed heat insulating material 30 leaks as in the conventional case (see FIG. 14). (See FIG. 3).

In the above embodiment, the cover 112 is provided, but a check valve may be used. Alternatively, the decorative tape 113 may be used to take out the hot melt injection nozzle 31 from the injection port 111, and then the decorative tape 113 may be attached to close the injection port 111. In addition, injection port 11
Although 1 is provided on the bottom plate 11, it goes without saying that it may be provided on the top plate 12.

According to the present invention, since the injection port 111 is provided in the bottom plate 11 or the top plate 12, even when the hot melt injection nozzle 31 cannot be inserted from the back side, hot melt sealing is possible. Also, the cover 112 or the decorative tape 11
3 is provided on the bottom plate 11 or the top plate 12, so
30 is not leaked.

Next, an embodiment of the second invention according to claim 4 will be described. The heat-insulating box 102 of the present invention is configured substantially the same as the conventional one, but the bottom plate 11 is different. The bottom plate 11 is provided with a plurality of (two in the example shown in FIG. 4) inlets 114 for the undiluted foaming liquid 30A.
A plurality of gas vent holes 115 are formed in the bottom plate 11 including 11B. 116 is a charge cover.

The heat insulating box 102 is manufactured as follows. As shown in FIG. 5, the outer box 10 with the inner box 20 attached thereto.
Is arranged so that the top plate 12 is at the bottom and the bottom plate 11 is at the top,
The foaming undiluted solution 30A is injected from the injection machine 33 inserted into the inlet 114. The foaming undiluted solution 30A flows directly below the inlet 114 (in the direction of the arrow in the figure), first accumulates in the ceiling space 12A near the top plate 12, and starts to foam there. Then, the ceiling space portion 12A is filled, and then foaming and filling is started from the vicinity of the ceiling space portion 12A toward above the bottom plate 11 (in the direction of the dashed arrow in the drawing), and as shown in FIG. And will be filled up with.

At this time, gas generated by foaming and atmospheric gas in the space 21 are exhausted from gas vent holes 115 formed in the bottom plates 11 and 11B. Therefore, the generation of gas voids and the like is small, and the filling state of the foamed heat insulating material 30 is also good. In addition, since the inlet 114 is provided at a position corresponding to the space 21 of the bottom plate 11, the inlet 114 and the ceiling space 12 are provided.
The distance from A corresponds to the height H of the heat insulating box 102. Therefore, as shown in FIG. 5, even if the foaming undiluted solution 30A accumulates in a “mountain” in the depth direction, the injection time can be sufficiently maintained because the height H is large as in the related art.
The foamed heat insulating material 30 does not overflow or leak. Further, the inlet 114 is provided with the depth dimension W of the heat insulating box 102.
, The initial flowing distance of the foaming undiluted solution 30A is shortened, and since the foaming direction of the foaming undiluted solution 30A is only upward, the foaming distance is short and the foaming time is shortened accordingly, and the foaming time is shortened. The foaming obstacle due to the early curing of the foamed heat insulating material 30 on the way is eliminated.

According to the present invention, HCFC-
Even when a foamed heat insulating material using 22 or the like is used, the initial fluidity is good, the generation of gas voids is small, and the gas is uniformly filled, so that a stable heat insulating box can be manufactured. In addition, injection port 11
4 does not impair the appearance, so it can meet the market demand for using the heat-insulating box as a partition for living space. The injection port 114 may be used also as the injection port 111 according to claim 1 or may be provided separately.

Next, an embodiment of the third invention according to claim 5 will be described. The heat-insulating box 103 of the present invention is configured substantially the same as the conventional one, but differs in the back plate 13.

In the vicinity of the bottom plate 11 of the back plate 13, a plurality of (two in the example shown in FIG. 7) inlets 117 for the foaming undiluted solution 30A are opened at positions corresponding to the space portions 21. A plurality of gas vent holes 118 are formed in the bottom plate 11 including the bent portion 11B. The inlet 117 is formed in an oval shape whose major axis is the top or bottom surface direction according to the insertion direction of the injector 33.

The heat insulating box 103 is manufactured as follows. As shown in FIG. 8, the outer box 10 to which the inner box 20 is attached is arranged so that the opening is at the bottom and the back plate 13 is at the top.
The foaming stock solution 30A is injected from the injector 33 inserted into the container 117 toward a predetermined position Q, that is, obliquely toward the top surface. The foaming undiluted solution 30A flows down from the inlet 117 in the direction of the arrow shown in the figure, and
At the injection position Q on the opening side of 21, it accumulates in a “hill”, starts to foam in the direction of the dashed arrow, and fills the entire space 21.

At this time, if the distance L between the back plate 13 corresponding to the injection port 117 and the injection position Q is set to be sufficiently large, the injection time of the foaming undiluted solution 30A from the injection machine 33 becomes longer. Therefore, the foam filling can be uniformly spread without the foam heat insulating material 30 being ejected or leaking from the injection port 117, and a stable filling state can be obtained.

Further, since the shape of the injection port 117 is formed in an oval shape with respect to the insertion direction of the injection machine 33,
And the clearance between the injection machine 33 and the injection machine 33 are sufficiently ensured. Therefore, since the orientation of the injector 33 with respect to the injection position Q can be adjusted, stable production can be achieved.

Further, as shown by a broken line in FIG.
The inlet 117A may be provided near the top plate 12 of the back plate 13.

9 and 10, the inlet 119 is formed in the bent portion 11B of the bottom plate 11, and the distance M between the inlet 119 and the back plate 13 corresponding to the injection position R is made larger than the distance L. We can secure it. The method of manufacturing the heat insulating box 103 is the same as described above. According to the present embodiment, the foaming stock solution 30A
Can be further lengthened, so that a stable filling state can be obtained.

[0033]

As described above, in the heat insulating box according to the first aspect, the inlet of the hot melt is connected to the bottom plate of the outer box or the bottom plate of the outer box.
Opened on the top panel. Therefore, the insulation box is opened to the front.
It has a mouth, a bottom plate, a top plate, a back plate, and both side plates.
Outer box, inner box attached inside the outer box, and
Attached with a predetermined gap between the box and the side plates
Vacuum insulation panel, and the outer box and the inner box
It was composed of foam insulation material filled and foamed in the space
In the thermal insulation box according to claim 1, the bottom surface of the outer box
Inject hot melt from the insertion opening in the plate or top plate
If it is inserted, the fitting part between the outer box and the inner box
Can be sealed with
No foam insulation leaks out of the box. Claim 4
The method of manufacturing the heat insulation box described above is to inject foam insulation into the bottom plate
A gas inlet and a vent hole, and place the top plate
Filling and foaming with foam insulation facing down
I am trying to do it. Therefore, the heat insulation box according to claim 4.
In the body manufacturing method, the atmospheric gas in the space
It is discharged to the outside from the gas vent hole by filling the heating material. Ma
In addition, the distance between the injection port and the injection position can be increased.
it can. For this reason, the generation of gas voids in the foam insulation is small.
And the state of filling is good. Especially as a foaming agent
HCFC-22 and HFC-1 which are substitutes for Freon gas
It has a high viscosity such as 34a and becomes flossy when foamed.
Even, stable foam filling with uniform density can be obtained
There is an effect that. Further, the heat insulating box according to claim 5.
The manufacturing method of the back plate or bottom body, the inlet, the back plate
Open gas vent holes on the bottom plate and open the opening down,
With the back plate facing up, diagonally toward the top or bottom
Is filled with foam insulation and foamed. Therefore,
In the method for manufacturing a heat insulating box according to claim 5, the space portion is
Atmosphere gas is a gas vent hole by filling with foam insulation
Are discharged to the outside. Also between the injection port and the injection position
The distance can be increased. For this reason, foam insulation
The evolution of gas voids is reduced, it better be filled state
You. In particular, HC which is a substitute for Freon gas as a foaming agent
It has high viscosity like FC-22, HFC-134a etc.
Even if flossing when foaming, uniform density
There is an effect that a fixed foam filling can be obtained.

[Brief description of the drawings]

FIG. 1 is a drawing according to the first embodiment of the present invention, and is a rear perspective view of a heat insulating box during hot melt injection.

FIG. 2 is a perspective view of a rear view of a heat insulating box according to another embodiment of the present invention, showing another embodiment.

FIG. 3 is a drawing according to the first embodiment of the present invention, and is a cross-sectional side view for explaining a hot melt injection state of an insulating box having a vacuum insulating panel.

FIG. 4 is a view according to the fourth aspect of the present invention, and is a rear perspective view of the heat insulation box during injection of a foaming undiluted solution.

FIG. 5 is a drawing according to the invention of claim 4, wherein X in FIG.
-It is an X-ray sectional view.

FIG. 6 is a drawing according to the invention of claim 4, and is a cross-sectional side view showing a state after foam filling of the foam heat insulating material.

FIG. 7 is a drawing according to the invention of claim 5, which is a rear perspective view of the heat insulating box.

8 is a drawing according to the fifth aspect of the present invention, and is a cross-sectional view taken along the line YY of FIG. 7, showing a state immediately after injection of a foaming stock solution.

FIG. 9 is a perspective view of a rear view of a heat insulating box according to another embodiment of the present invention, showing another embodiment.

FIG. 10 is a drawing according to the invention of claim 5, and is a cross-sectional view taken along the line ZZ of FIG. 9 showing a state immediately after injection of the foaming stock solution.

FIG. 11 is a perspective view of a conventional heat insulating box, which is a rear view external view of the heat insulating box.

FIG. 12 is a drawing of a conventional heat insulating box, and is an external perspective view showing a state before filling with a foamed heat insulating material.

13 is a drawing of a conventional heat insulating box, and is a cross-sectional view taken along line BB of FIG. 11 immediately after filling with a foamed heat insulating material.

FIG. 14 is a drawing of a conventional heat-insulating box, and is a cross-sectional side view showing a state where a foamed heat-insulating material is filled in a heat-insulating box provided with a vacuum heat-insulating panel.

[Explanation of symbols]

 10 Outer case 11 Bottom plate 11B Bend 111 Inlet 112 Cover 113 Decorative tape 114 Inlet 115 Gas vent hole 117 Inlet 118 Gas vent hole 119 Inlet 12 Top plate 13 Back plate 14 Side plate 20 Inner box 21 Space 30 Foam insulation 30A Undiluted foam solution 31 Hot melt injection nozzle 32 Inlet 33 Injector 34 Gas vent hole 40 Hot melt

Claims (6)

(57) [Claims] 1. An outer box having an opening on the front side and comprising a bottom plate, a top plate, and both side plates, an inner box attached inside the outer box, and the inner box and the both side plates. Predetermined interval between
A vacuum insulation panel attached with a foam insulation material filled and foamed in a space formed by the outer box and the inner box
And a heat-insulating box in which a fitting portion between the outer box and the inner box is sealed with hot melt in order to prevent leakage of the foamed heat insulating material, wherein the hot-melt inlet is formed in the outer box. A plurality of heat-insulating boxes are provided on the bottom plate or the top plate. 2. The heat insulating box according to claim 1, wherein a cover or a check valve is attached to the inlet. 3. The heat insulating box according to claim 1, wherein a decorative tape is attached to the inlet. 4. A foam is formed in a space formed by an outer box having an opening on the front side and constituted by a bottom plate, a top plate, a back plate, and both side plates, and an inner box attached to the inside of the outer box. Fill insulation
In the method for manufacturing a heat insulating box to be foamed, a plurality of inlets for injecting a foamed heat insulating material into the bottom plate ,
Atmosphere gas in the space when foam insulation is injected
And the vent plate is opened , and the top plate is placed down, the bottom plate is placed up, and the foam insulation is injected directly below the inlet. A method of manufacturing a heat-insulating box. 5. A bottom plate, a top plate, and a back surface having an opening in a front surface.
An outer box composed of a plate and both side plates, and attached inside the outer box
Filling the space formed by the inner box with the foam insulation material
In the method for producing a heat insulating box to be foamed,
A plurality of inlets for injecting foam insulation, and in the space
Atmosphere gas in the space when foam insulation is injected
Open the gas vent holes for extracting
Is placed below, with the back plate facing up, and the injection
Foam insulation diagonally from the mouth toward the top or bottom
A method for producing a heat-insulating box , characterized by injecting water. 6. The method according to claim 5, wherein the inlet is formed in an oval shape having a top surface or a bottom surface as a major axis.