JP3792921B2 - Refrigerated box manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a refrigerated box manufacturing method, and more particularly to a refrigerated box manufacturing method in which a urethane stock solution is uniformly injected into a space between an inner box and an outer box.
[0002]
[Background Art and Problems to be Solved by the Invention]
For insulation of refrigerated boxes, a foamed urethane solution is often used.
[0003]
As shown in FIG. 20 and the like, the urethane stock solution is fired by injecting the urethane stock solution into an intermediate portion of the refrigerated box 11 formed by the outer box 11a made of iron plate and the inner box 11b made of synthetic resin.
[0004]
The urethane stock solution is usually injected through two holes 12a, 12b or four holes 12a, 12b, 12c, 12d opened in the back plate 11aa of the refrigerated box 11.
[0005]
First, the mobile urethane stock solution injection method will be described with reference to FIG.
[0006]
In this moving method, a urethane injecting machine 13 is arranged above the right hole 12a at the center of the back plate 11aa of the refrigerated box 11, and a urethane stock solution is injected from the hole 12a. When this injection is completed, the urethane injector 13 is moved to the upper part of the left hole 12b and injected from the hole 12b.
[0007]
Next, a two-nozzle type urethane stock solution injection method will be described with reference to FIG.
[0008]
In this two-nozzle method, two nozzles 14 having one injection hole 14a and two pouring holes 14b, 14c are attached to the left and right holes 12a, 12b of the back plate 11aa of the refrigerated box 11, and urethane is supplied from these nozzles 14. The stock solution is poured into the refrigerated box 11 at the same time.
[0009]
Further, a two-machine injection method using two urethane injectors will be described with reference to FIG.
[0010]
In this two-machine injection method, the urethane stock solution is separately injected into the left and right holes 12a and 12b of the back plate 11aa of the refrigerated box 11 simultaneously from separate urethane injectors 15a and 15b.
[0011]
Furthermore, a four-machine injection method using four urethane injectors will be described with reference to FIG.
[0012]
In this four-machine injection method, urethane from four urethane injection machines 17a, 17b, 17c, and 17d that are respectively provided in four holes 16a, 16b, 16c, and 16d opened in the ceiling and bottom of the back plate 11aa of the refrigerated box 11 are provided. The stock solution is injected.
[0013]
Among these injection methods, the transfer method is a relatively simple facility, so the equipment cost can be reduced, but the problem is that the density of urethane to be fired becomes uneven due to the time difference in the injection and the performance deteriorates in the long term. was there.
[0014]
In the 2-nozzle method, the urethane stock solution can be uniformly injected into the refrigerated box 11, but when it is used for one having a different capacity, the size of the 2-nozzle 14 is changed, so two or 2-nozzles of different types are required. There was a problem that a large amount of equipment was required.
[0015]
The two-injector method can uniformly inject the urethane stock solution into the refrigerated box 11 to produce a high-quality product, but has a problem that the equipment cost increases.
[0016]
The 4-injection method can inject the urethane stock solution more uniformly than the 2-injector method to produce a product with superior quality. However, the 4-injection method has a problem that it costs more equipment than the 2-injector method. there were.
[0017]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a refrigerated box manufacturing method for manufacturing a high-quality product while solving the above problems.
[0018]
[Means for Solving the Problems]
The present invention is a method of manufacturing a refrigerator provided with an outer box and an inner box, wherein the inner box includes a first storage part and a second storage part which are container-like and are separate from each other. The first storage portion and the second storage portion are integrally connected by a connecting plate portion on the opening side as the front side, and these first storage portion and second storage portion are on the back side. A gap portion is formed between the first storage portion and the second storage portion, and a gap portion is formed between the first storage portion and the second storage portion. On the back surface of the connecting plate portion in the inner box, a separator having a high central portion and a pair of flow guide slope portions positioned on both sides in the length direction of the groove lower than the central portion is formed. After, the inner box is placed in the outer box, and there is a space between them. As is formed, these are placed so that the front side is the lower side and the back side is the upper side, and correspond to the central portion of the separator in the groove portion on the rear surface of the outer box. The urethane stock solution is injected from the opening at the position, and the urethane stock solution that falls and flows due to gravity is guided by the flow guide inclined portion in the separator, and is branched and flowed to both sides in the length direction of the separator along the groove. The manufacturing method for a refrigerator is characterized in that the urethane stock solution that branches and flows is introduced into the space and filled in the space.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of injecting a urethane stock solution in the method for producing a refrigerated box according to the present invention will be described below with reference to FIGS.
[0029]
The injection of the urethane stock solution of the present invention is provided with an outer case 21a made of iron plate as shown in FIG. The box 21a includes left and right side plates 21aa and 21ab, a ceiling plate 21ac, a back plate 21ad, an intermediate bottom plate 21ae, a lower back plate 21af, and a bottom plate 21ag.
[0030]
A hole 22 is formed near the center of the back plate 21ad of the outer box 21a, and a urethane stock solution is injected from a urethane injector 23 as shown in FIG.
[0031]
Further, a recess 24 is formed by the intermediate bottom plate 21ae and the lower back plate 21af of the outer box 21a, and a compressor or the like (not shown) is arranged.
[0032]
As shown in FIG. 2, the urethane stock solution is provided with an inner box 21b made of a synthetic resin slightly smaller than the outer box 21a. The inner box 21b includes left and right side plates 21ba and 21bb having flanges on the surface, a ceiling plate 21bc having a flange on the surface, a back plate 21bd, an intermediate bottom plate 21be, a lower back plate 21bf, and a bottom plate 21bg having a flange on the surface. Yes. An intermediate partition 25 is provided near the center of the back plate 21bd of the inner box 21b, and a heat-insulating separator 26 is attached to the surface of the inner box 21b with tape 27 or the like as shown in FIGS. In addition, heat insulating partition plates 28a and 28b are attached to both the left and right side portions with tape 27 or the like so that the urethane stock solution is evenly divided and guided accurately.
[0033]
As shown in FIG. 3, the inner box 21b is fitted into the outer box 21a to form a refrigerated box 21 having hollow portions 29a, 29b, 29c, 29d and the like.
[0034]
As shown in FIGS. 4 and 5, the separator 26 is formed in an approximately chevron shape, and receives the urethane stock solution at the top portion 26a so as to be evenly divided right and left or back and forth.
[0035]
Grooves or notches 30 extending left and right are formed in the top portion 26a of the separator 26 so as to stir the dilute urethane stock solution. This groove or notch 30 may be formed at the front and rear as shown in FIG.
[0036]
A method of injecting the urethane stock solution from the urethane injector 23 into the refrigerated box 21 configured as described above will be described with reference to FIGS. 7, 8, and 9.
[0037]
First, the back plate 21ad of the refrigerated box 21 is placed on a jig (not shown) with the back plate 21ad facing upward. Next, a urethane injector 23 is disposed above the hole 22 of the refrigerated box 21.
[0038]
The urethane stock solution is injected from the urethane injection machine 23 arranged in this way so as to pass between the side plates 28a, 28b of the intermediate cut portion 25 and hit the top portion 26a of the separator 26 as indicated by a dotted arrow.
[0039]
The urethane stock solution applied to the separator 26 is agitated at the notch 30 and is divided into the left and right sides in the direction of the dotted arrows as shown in FIGS. 8 and 9 by the slope of the mountain, etc., and uniformly injected into each of the hollow portions 29a, 29b, etc. Is done.
[0040]
A heat insulating wall integrated with the outer box 21a and the inner box 21b can be formed by foaming of the injected urethane stock solution. In addition, according to this injection method, the urethane stock solution can be transferred to the hollow portions 29a, 29b, 29c, 29d, etc. of the refrigerated box 21 with only one urethane injector 23 and the separator 26 attached to the surface side of the intermediate cut portion 25. Since injection can be performed uniformly, the equipment cost can be reduced as compared with the conventional moving method, two-nozzle method, two-machine injection method, four-machine injection method, and the like.
[0041]
As another embodiment for injecting the urethane stock solution, as shown in FIG. 10, a hole 22 is formed near the center of the back plate 21ad of the refrigerated box 21 and the hole 22 is injected, and as shown in FIG. There is a type in which a hole 22 is formed near the ceiling of the plate 21ad and injected from the hole 22, and a type in which a hole 22 is formed in the back plate 21ad near the intermediate bottom plate 21ae and injected from the hole 22 as shown in FIG.
[0042]
These injection methods can be carried out in substantially the same manner as in the first embodiment. However, in the case shown in FIGS. 11 and 12, the injection path becomes longer or the urethane stock solution is uniformly injected into the hollow portions 29a and 29b. There is a risk that it will not be possible.
[0043]
In such a case, as shown in FIGS. 13 and 14, the ceiling side 21ac and the like of the refrigerated box 21 may be raised from the base 31 by a jig so that the urethane stock solution is uniformly injected into the hollow portion 29b and the like at the bottom.
[0044]
In addition, in the hole 22 opened near the bottom plate 21ac, the intermediate portion 29b may be bent, so it may be necessary to attach the separator 26 to the upper side of the bent portion.
[0045]
By taking such measures, the urethane stock solution can be uniformly injected into the hollow portion 29a of the refrigerated box 21 or the like.
[0046]
In addition, electrical parts 32 such as switches and heaters may be attached to the back plate 21ad of the outer box 21a. In such a case, the hole 22 for injecting the urethane stock solution is kept away from the electrical component 32 as shown in FIG. 15, and a separator 26 as shown by a dotted line is attached to the hole 22 so that the urethane stock solution is separated by the separator 26. It is good to make it divert.
[0047]
Further, as shown in FIG. 16, it is preferable that the left side h1 is made higher and the right part h2 is made lower so that the urethane stock solution flows quickly into the right hollow part 29d having a bent part and uniformly injected as shown in FIG.
[0048]
On the contrary, as shown in FIG. 17, the right part h3 is made higher and the left part h4 is made lower so that the urethane stock solution is allowed to flow quickly and uniformly into the left hollow part 29c where the interval or the like is narrow.
[0049]
Further, the separator 26 in FIGS. 4 and 5 is formed as a separate part from the outer box 21a or the inner box 21b, but is formed integrally with the outer box 21a or the inner box 21b as shown in FIGS. Also good. In this way, the parts cost of the separator 26 can be reduced.
[0050]
Further, in the above embodiment, the refrigerated box 21 assembled in advance is attached to the jig, but it may be assembled directly on the jig. In this way, the assembly work is reduced and the work space and the like can be reduced.
[0051]
【The invention's effect】
In the inventions of claims 1, 2, 3, and 4, a space is formed between the outer box and the inner box, a separator is provided in the space, and a urethane stock solution is applied to the separator so that the space is evenly divided. Therefore, the urethane stock solution can be evenly divided into the refrigerated box with low equipment costs.
[0052]
In the inventions of claims 5, 6, 7, 8, and 9, since the separator is formed in an approximately chevron shape, the urethane stock solution can be uniformly injected into the hollow portion.
[0053]
Furthermore, since the partition plate which has an opening in the lower part is attached to the hollow portions on both sides of the separator, the urethane stock solution can be accurately guided to the separator.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an outline of an outer box used in a refrigerated box manufacturing method of the present invention.
FIG. 2 is a perspective view showing an outline of an inner box used in the refrigerated box manufacturing method of the present invention.
FIG. 3 is a perspective view showing an outline of a method for manufacturing a refrigerated box according to the present invention.
4 is a front view showing a separator attached to FIGS. 2 and 3. FIG.
5 is a cross-sectional view taken along the line II-II in FIG. 4 and viewed in the direction of the arrows.
6 is a front view showing another separator attached to FIGS. 2 and 3. FIG.
FIG. 7 is an explanatory view showing the vicinity of a hole for injecting a urethane stock solution into a refrigerated box.
FIG. 8 is an explanatory diagram for injecting a urethane stock solution into a refrigerated box.
FIG. 9 is another explanatory view of injecting the urethane stock solution into the refrigerated box.
FIG. 10 is another explanatory view of injecting the urethane stock solution into the refrigerated box.
FIG. 11 is another explanatory view of injecting the urethane stock solution into the refrigerated box.
FIG. 12 is another explanatory view of injecting the urethane stock solution into the refrigerated box.
FIG. 13 is another explanatory diagram in which a urethane stock solution is injected into a refrigerated box.
FIG. 14 is another explanatory view of injecting the urethane stock solution into the refrigerated box.
FIG. 15 is an explanatory view showing the vicinity of another hole for injecting a urethane stock solution into a refrigerated box.
FIG. 16 is a front view showing another separator.
FIG. 17 is a front view showing another separator.
FIG. 18 is a front view showing another separator.
19 is a left side view of FIG.
FIG. 20 is a perspective view showing an outline of a conventional refrigerated box manufacturing method.
FIG. 21 is a perspective view showing an outline of another conventional refrigerated box manufacturing method.
FIG. 22 is a perspective view showing an outline of another conventional refrigerated box manufacturing method.
FIG. 23 is a perspective view showing an outline of another conventional refrigerated box manufacturing method.
[Explanation of symbols]
11, 21 Refrigerated box 11a, 21a Outer box 11b, 21b Inner box 12a, 12b, 12c, 12d, 22 Hole 13, 23 Urethane injector 14 2 or nozzle 25 Intermediate partition 26 Separator 27 Tape 28a, 28b Partition plate 29a 29b, 29c, 29d Hollow part

Claims (8)

A method of manufacturing a refrigerator having an outer box and an inner box,
Each of the inner boxes includes a first storage portion and a second storage portion that are container-like and separate from each other, and the first storage portion and the second storage portion are arranged on the opening side as the front side. In addition to being integrally connected with the connecting plate portion, on the back side, a gap portion is formed between the first storage portion and the second storage portion so as to separate them. A method of manufacturing a refrigerator,
In the groove portion sandwiched between the first storage portion and the second storage portion, on the back surface of the connecting plate portion in the inner box, a high central portion, and the length of the groove lower than the central portion. Forming a separator having a pair of flow guide slope portions located on both sides in the direction;
Thereafter, the inner box is stored in the outer box so that a space is formed between them, and these are placed so that the front side is the lower side and the back side is the upper side,
A urethane stock solution is injected from an opening at a position corresponding to the central portion of the separator in the groove portion on the back surface of the outer box, and the urethane stock solution that falls and flows by gravity is guided by the flow guide inclined portion in the separator. Branching and flowing along the groove to both sides of the separator in the longitudinal direction, guiding the urethane stock solution flowing and flowing into the space, and filling the space.
A method of manufacturing a refrigerator, characterized in that   Among the gap portions of the inner box, the upper portion in the above-described placement state is a seal portion that is sealed by a sealing member so that the urethane stock solution does not leak, and the lower portion is not sealed by the sealing member. 2. The method for manufacturing a refrigerator according to claim 1, wherein the urethane undiluted solution is led from the open part to the space as an open part that is left open.   The method for manufacturing a refrigerator according to claim 1 or 2, wherein the separator is configured separately from the outer box.     The method for manufacturing a refrigerator according to claim 1 or 2, wherein the separator is configured integrally with the outer box.   The said center part in the said separator is formed as a substantially channel-shaped thing opened upwards by a pair of edge part which opposes the width direction, The Claim 1 thru | or 4 characterized by the above-mentioned. Manufacturing method of a refrigerator.   The plurality of groove-shaped cuts that run along the edge portions are formed in the center portion of the separator at positions sandwiched between the pair of edge portions. Manufacturing method of a refrigerator.   The method for manufacturing a refrigerator according to any one of claims 1 to 6, wherein the pair of flow guide slope portions in the separator are formed in a tapered shape inclined symmetrically to each other.   The method of manufacturing a refrigerator according to any one of claims 1 to 6, wherein the pair of flow guide slope portions in the separator are formed in a tapered shape that is asymmetrically inclined with respect to each other.

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