JP3319873B2 - Manufacturing method of heat insulation box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a heat insulating box manufactured by filling a hollow outer shell with a foaming heat insulating material.

[0002]

2. Description of the Related Art Insulated boxes such as refrigerators and ice storage boxes have a hollow outer shell formed by an inner box and an outer box. It is configured to be filled in the part. When filling the heat insulating material, the foaming pressure of the stock solution acts as a force to expand the outer shell from the inside, so in order to prevent deformation of the outer shell due to the pressure, the outer shell is surrounded by a foam jig surrounding it It is put in. By the way, a large opening is formed on the front surface of this kind of heat insulating box for taking in and out of a storage object. For this reason, simply pressing the outside of the outer shell with a foaming jig causes the foaming pressure to act to narrow the above-mentioned opening, so that a foaming jig for receiving the foaming pressure is also inserted into the opening. I needed to.

[0003]

However, in the above-mentioned conventional manufacturing method, it is necessary to insert a relatively strong foaming jig in the entire area inside the opening, so that the expensive foaming jig becomes large and the manufacturing cost increases. There was a problem that raises. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing a heat-insulating box that can make a foaming jig as simple as possible.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a method for manufacturing a heat insulating box having a storage material access port, wherein the inside of the heat insulating box extends from the opening of the outer box forming the exterior to the interior of the heat insulating box. In a case where a box is inserted and an outer shell formed by an outer box and an inner box is filled with a foamable heat insulating material, an opening in the inner box for forming an access port for the storage product is provided with a hollow inside.
Inserting and fixing a reinforcing frame body filled with a foaming heat insulating material in the part, and in this state, filling the foaming heat insulating material in the outer shell body and leaving the reinforcing frame body in the heat insulating box. (The invention of claim 1). In this case, a door frame of a door that opens and closes the entrance can be used as the reinforcing frame (the invention of claim 2).

[0005]

According to the above-mentioned method, when a stock solution of the foamed heat insulating material is injected into the outer shell to cause foaming, the foamed heat insulating material is foamed in the outer shell and is filled to every corner. At this time, the foaming pressure acts in a direction to narrow the entrance of the storage of the inner box, but since the reinforcing frame is inserted into the entrance, the foaming pressure is received by the reinforcing frame and the outer shell body is received. Is suppressed. Further, when the reinforcing frame is a door frame, it is not necessary to remove the door frame after filling the foamed heat insulating material.

[0006]

As described above, according to the method for manufacturing the heat insulating box of the present invention, a part of the foaming pressure from the outer shell is carried by the reinforcing frame. Even so, since the reinforcing frame bears the foaming pressure, the foaming jig can have a simple structure, and the production cost can be reduced. According to the invention of claim 2, the door frame attached to the opening is used as a reinforcing frame.
Since the door frame can be left in the outer shell and used after filling with the foamed heat insulating material, the manufacturing process becomes more rational and contributes to cost reduction.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is applied to an ice storage will be described below with reference to FIGS. The completed form is as shown in FIG. 1, and a pivotable door 11 is attached to the lower part of the front surface of the heat insulating box 10 so as to open and rotate upward through a hinge 12. Is provided with a door 14 in which two glass plates 13 are provided in a sliding manner,
A connection opening 15 for connecting to an ice maker (not shown) is formed on the upper surface. As shown in FIG. 2, the heat-insulating box 10 includes an outer box 16 serving as an exterior part, and an inner box serving as an interior part inserted therein through an outer box opening 17 formed from the front surface to the upper surface thereof. 18 and the outer shell 19
It is manufactured by injecting an undiluted solution of a foamed heat insulating material such as urethane foam into the hollow portion of the outer shell 19 and foaming the same to fill the heat insulating material 20 (shown in FIG. 8 and subsequent figures). . First, the outer case 16 will be described. As shown in detail in FIG. 3, the outer case 16 has a vertical box shape having an outer case opening 17 formed from the upper surface to the front surface. 22, bottom plate 23 and back plate 2
4 are assembled with fasteners such as rivets. In addition, a stock solution injection port 25 for injecting the stock solution of the heat insulating material 20 is formed at the upper corner of the bottom plate 23. Further, a flange portion 26 formed by bending an edge of each plate toward the inside of the outer case opening 17 is provided at a portion corresponding to the peripheral edge of the outer case opening 17 among the left and right side plates, the bottom plate and the back plates 21 to 24. The sealing sponge tape 27 is adhered at the time of assembly so as to go around the whole area. In particular, in the present embodiment, the sponge tape 27 is of a type having an adhesive layer on both sides in order to enhance the sealing property.

Next, the inner box 18 will be described. The inner box 18 is integrally formed by a rotational molding method of plastic, and has a vertical inner box opening 28 formed from the upper surface to the front surface like the outer box 16. (See FIG. 2). In addition, the above-mentioned rotation molding method is to charge a raw material resin powder into a mold, heat the mold while rotating the mold biaxially, form a resin layer on the inner surface of the cavity, and then mold the mold. This is a well-known molding method in which the resin layer is hardened by cooling while continuing to rotate, and finally, the mold is opened to take out the product. It is possible to integrally mold the inner box 18 having a deep drawing shape, which is impossible by vacuum molding. it can. Here, the box main body portion 29 has a smooth R shape with rounded inner ridges and corners, taking advantage of the integral molding, so that the inside can be easily wiped off and cleaned. I have. Of the box main body portion 29, a portion corresponding to the peripheral edge of the inner box opening 28 is provided with a groove-shaped flange portion 30 having a U-shape by bending the edge toward the outside and further bending the front end substantially at a right angle. It is formed around the circumference. In addition, window frame mounting concave portions 31 are formed on both left and right sides of the inclined surface portion of the groove-shaped flange portion 30 which is located between the upper surface and the front surface.

On the other hand, the window frame 32 has a horizontally long rectangular frame shape,
It functions as a reinforcing frame according to the present invention. In this embodiment, the window frame 32 is also integrally manufactured by rotational molding, and the hollow interior is filled with a foam heat insulating material 33 such as urethane foam (see FIG. 6). The window frame 32 has two rails 34 for supporting and sliding the two glass plates 13. Insulated box 10 having the above configuration
First, as shown in FIG. 4, the window frame 32 is previously placed in the window frame mounting recess 31 of the inner box 18 and fixed to the inner box 18 with screws 35 as shown in FIG. As a result, the window frame 32 is fixed between the left and right sides of the inner box opening 28 in a bridged state.
It is reinforced firmly against deformation that narrows the inner box opening 28. Thereafter, as shown in FIG. 3, the inner box 18 is housed through the outer box opening 17 of the outer box 16 in which the sponge tape 27 is adhered to the flange 26, and the flange 2 of the outer box 16 is stored.
6 is housed in the channel flange 30 of the inner box 18. Then, as shown in FIGS. 8 to 11, the flange portion 26 of the outer case 16 is fitted into the groove-shaped flange portion 30 of the inner case 18, and the sponge tape 27 is provided with an adhesive layer on both sides. And the inner box 18 is temporarily connected to form the outer shell 1
9 (see FIG. 7). Thereafter, the outer shell 19
Is stored in a foaming jig (not shown), and a stock solution of urethane foam is injected from a stock solution inlet 25 of the outer box 16, and this is poured into the outer shell 1.
When foaming is performed in the hollow portion of the inside 9, the foamed undiluted solution fills every corner in the outer shell 19, and solidifies to form the heat insulating material 20. At this time, the foaming pressure acts from the inside of the outer shell body 19 to the outside as the stock solution foams. However, the outer shell 1
Since the outside of 9 is pressed by a foaming jig, there is no deformation to the outside, and the window frame 32 is in a cross-linked state between the inner box openings 28 of the inner box 18 inside the outer shell 19. Therefore, the deformation in the direction to narrow the inner box opening 28 is suppressed. Depending on the foaming pressure from the inside of the outer shell 19, it may be desirable to insert a foaming jig also into the inner box 18, but even in this case, since the foaming pressure is received by the window frame 32, The jig can be greatly simplified.

As described above, according to the present embodiment, the use of the window frame 32 makes it possible to omit or greatly simplify an expensive foaming jig disposed in the inner box 18. Manufacturing costs can be greatly reduced. Further, in the present embodiment, in particular, since the window frame 32 originally attached to the inner box 18 is used as the reinforcing frame, it is not necessary to remove the reinforcing frame after the heat insulating material 20 is filled, which is more rational. It is a target. Further, in this embodiment,
By making use of rotational molding, the inner box 18 can be manufactured by integral molding of plastic, so that the inner surface of the inner box 18 can be formed into a seamless and smooth shape, making daily cleaning work easy. And become hygienic. Of course, compared to the case where the inner box is made of a combination of plastic and stainless steel plates, it is more durable and can be manufactured at low cost, and the sealing at the time of filling the heat insulating material becomes extremely simple. The advantages in the manufacturing process are also great. Further, in this embodiment, since the outer box 16 is formed with the flange portion 26 bent inward and the inner box 18 is formed with the groove-shaped flange portion 30 having a U-shaped cross section, the two are fitted together. When the heat insulating material 20 is foamed, the two naturally come into close contact with each other due to the foaming pressure. For this reason, even if a structure such as riveting is not employed, the leakage of urethane can be reliably sealed with the interposition of the sponge tape 27, which is also extremely convenient in the manufacturing process.

<Other Embodiments> The present invention is not limited to the above-described embodiments. For example, the following embodiments are possible, and these are also included in the technical scope of the present invention. (1) In the above embodiment, an example in which the present invention is applied to the manufacture of the heat insulating box 10 for an ice storage is shown. However, the present invention is not limited to this, and the present invention is not limited to this. The present invention can be widely applied to a heat-insulating box having an access port. (2) In the above embodiment, the window frame 32 is used to form the reinforcing frame. However, any reinforcing frame that can be bridged between both sides of the inner box opening may be used. May be attached.

In addition, the present invention is not limited to the embodiment described with reference to the above description and drawings, but can be implemented with various modifications without departing from the scope of the invention.

[Brief description of the drawings]

FIG. 1 is a perspective view of a completed embodiment showing one embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a perspective view of an outer box.

FIG. 4 is a perspective view of an inner box with a window frame attached.

FIG. 5 is a perspective view of a window frame.

FIG. 6 is a longitudinal sectional view of a window frame.

FIG. 7 is a perspective view of an outer shell.

FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG.

9 is a cross-sectional view taken along the line IX-IX of FIG. 7, showing a state after the foam body is filled with the foamable heat insulating material.

10 is a cross-sectional view taken along the line XX of FIG. 7, showing a state after the foam body is filled with the foamable heat insulating material.

FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG.

[Explanation of symbols]

10: Insulated box 11: Door 16: Outer box 18: Inner box
19: outer shell 20: heat insulator 26: flange 27
... sponge tape 30 ... groove-shaped flange 32 ... window frame (reinforcement frame)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F25D 23/06

Claims (2)

(57) [Claims] 1. A method of manufacturing a heat-insulating box having a storage material access port, wherein an inner box serving as an interior part is inserted from an opening of an outer box serving as an exterior part of the heat-insulating box. An outer shell formed by an inner box is filled with an expandable heat insulating material, wherein an opening of the inner box for forming an entrance for the storage is filled with an expandable heat insulating material in a hollow interior.
A method for manufacturing a heat-insulating box, comprising: inserting and fixing a reinforcing frame comprising: a foaming heat-insulating material in the outer shell in this state; and leaving the reinforcing frame in the heat-insulating box. 2. The method according to claim 1, wherein the reinforcing frame is a door frame of a door that opens and closes the entrance.