JPH02279976A - Heat insulating box body and its production - Google Patents

Abstract

PURPOSE:To obtain a heat insulating box body whose upper and lower cases are integrally foamed by allowing a specified quantity of a foaming liquid to inject from an injecting opening between both inside and outside boxes corresponding to a storage chamber of a remote side from the injecting opening and permitting a constant quantity of the liquid to inject again after a specified time elapsed. CONSTITUTION:An injection gun 60 is inserted in an injection inlet 41 while an automatically closed cap is forced to open, aimed at a space corresponding to right and left side walls and an enough quantity to fill in the whole of a space Q in which a foaming liquid W1 such as hard polyurethane is allowed to correspond to a lower storage room. This injected liquid is allowed to foam and grow in the space Q, and again a proper quantity of the foaming liquid for filling in a space P allowed to correspond to an upper storage chamber 12 from the injection inlet 41 is injected after a specified time elapsed set at approximately the same time as a time necessary for filling in the right and left side walls of the lower storage chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] Industrial Field of Application The present invention relates to a heat insulating box constructed by filling a space formed between an inner and outer box with a foam heat insulating material.

Conventional Technical Utility Model Publication No. 1-x976 discloses a technology relating to a showcase connecting device in which an upper case with a front opening is placed on a lower case with an upper opening and the two cases are connected and connected. Japanese Patent Publication No. 616312 has an upper case formed of a heat insulating wall with an opening in the front, a lower case formed of a heat insulating wall with an opening in the top and on which the upper case is placed, and side walls provided on both left and right sides of both cases. Discloses a refrigerated showcase that constitutes the main body.

Problems to be Solved by the Invention In the showcase disclosed in Japanese Utility Model Publication No. 611976 in the prior art, the connecting portion between the upper case and the lower case is exposed on both the left and right sides, so the problem is that the appearance is poor. There is. Also, special public service 1986-6
According to the showcase disclosed in Japanese Patent No. 312, the connecting portion is hidden by the side wall, but the side wall must be attached separately, resulting in an increase in the size of the showcase. Furthermore, both cases must be foamed independently and then connected, and the manufacturing process requires a process of assembly, foaming, and connection, resulting in poor work efficiency. there were.

Therefore, the present invention provides a heat insulating box body in which the upper and lower cases are integrally foamed, and a method for manufacturing this box body.

[Structure of the invention]

Means for Solving Division Notifications The present invention provides an insulated box body comprising a lower storage chamber whose top surface is an outlet for taking out articles, and an upper storage chamber whose front surface is an outlet for articles. are combined to form a box, and a plurality of injection ports are provided on the top wall or bottom wall of the box, and the box is fixed to a foaming jig to correspond to the storage chamber on the side far from the injection port. The present invention provides a method for producing a heat insulating box body, in which a predetermined amount of foaming stock solution is injected from an injection port between the inner and outer boxes, and a predetermined amount of stock solution is again injected after a predetermined period of time has elapsed.

The present invention also provides a heat insulating box body in which the side walls of the lower storage chamber and the upper storage chamber are made of integral foam heat insulating material.

A predetermined amount of the foaming stock solution injected toward the space corresponding to the storage chamber on the side far from the action injection port grows in this space, while
It also tries to move toward the space closer to the injection port, but
A fixed amount of stock solution injected after a predetermined period of time weakens its progress; conversely, a fixed amount of stock solution is prevented from growing into the space on the far side, and a fixed amount of stock solution is directed into the space on the near side. Its growth is promoted and it acts to promote the advance of the previously injected stock solution to the unfilled area in the far side space.

In addition, since the side wall of the insulating wall formed by this method is formed continuously, the weight of the insulating box is distributed over the entire side wall, avoiding concentrated loads on one part of the wall. There is.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to FIGS. 1 to 8.

1 is an upper case 4 made up of a heat insulating wall 3 with an opening 2 for storing and taking out products on the front surface, and a lower part made of a heat insulating wall 6 having an opening 5 for storing and taking out products on the top surface. This is a heat insulating box body typified by a dual type showcase whose main body is constituted by a case 7.

The upper case 4 has a transparent door 1 that can open and close the opening 2 freely.
1 is installed, and the upper storage room 12 is connected to the insulating wall 3 with the transparent door 11.
is formed.

The heat insulating wall 3 includes an inner box 15 made of metal, such as a hot-dip galvanized steel plate, with an open front, and an inner box 15 made of metal, such as hot-dip galvanized steel, with an open front and an inner box 15 that accommodates the inner box with an appropriate space between the inner box 15 and the inner box 15. A foam insulation material 18 such as hard polyurethane is foamed and filled in a space P corresponding to the upper storage chamber, which is composed of an outer box 16 made of a steel plate and a resin breaker 17 that connects both boxes in an insulating manner. be done.

The lower case 7 has a transparent door 21 as a sliding door disposed in the opening 5 so as to be slidable in the front and rear direction, and the heat insulating wall 6 and the transparent door 21 form a lower storage chamber 22.

The heat insulating wall 6 is made of metal, for example, molten galvanized steel, with an open top surface and an inner box 25 made of metal, such as molten galvanized steel plate, and an inner box 25 that stores the inner box with an appropriate interval between the inner box 25 and has an open top surface. A space Q corresponding to a lower storage chamber consisting of an outer box 26 made of a plated steel plate and a resin breaker 27 disposed across the upper ends corresponding to the openings 5 of both boxes 25 and 26 is filled with hard polyurethane, etc. Constructed by foam filling with foam insulation material. A protruding wall 6A extending in the direction of the opening 5 is formed behind the upper opening 5 to form a hexahedron of front, rear, left, right and bottom protruding walls.

The left and right side plates 31 of the outer box 16 and 26 are formed of two plates, respectively, so that the left and right side plates 31 of the outer box 16 and 26 are common. Left and right breakers 32 made of resin are provided extending from the front end to near the back wall. This left and right breaker 3
2 has a passage 32 such as a passage hole or notch for passing the heat insulating material in a portion corresponding to the side wall of the rear upper storage chamber. Further, a metal reinforcing breaker 33 having a U-shaped cross section is arranged on the upper surface of the left and right breakers 32, and this reinforcing breaker 33 has a communication path 33A such as a hole or notch corresponding to the passage path 32A of the left and right breakers. It is formed. Further, a leak prevention plate 35 is provided to prevent the heat insulating material passing through the passageway 32A and the communication path 33A from leaking into the front part of the breaker 32 and the door storage part 10.

Next, a method for manufacturing the heat insulating box 1 will be explained.

Reference numeral 41 indicates an injection port for the foaming stock solution, which is formed on the outer box top plate 16A and is located at a portion corresponding to the left and right side walls in the space between the inner and outer boxes, 42 is an upper exhaust hole formed in large numbers on the outer box top plate, and 43
Reference numeral 44 indicates a breaker exhaust hole formed in the breaker 27 of the lower case, and 44 indicates a number of lower exhaust holes formed in the outer box bottom plate 26B. However, the injection port 41 may be formed on the outer box bottom plate 26B.

In addition, 45 indicates the top plate 1 of the outer box so as to cover the injection port.
It is a plate-shaped self-closing cap made of paper or soft resin attached to the inner surface of 6A, and is pushed open by insertion from the injection port 41 of the injection gun 60, which will be described later, and is returned by the elasticity of the mortar after injection of the foaming stock solution. Then, the foaming pressure of the foamed heat insulating material pushes toward the outer box, and the injection port 41 is closed.

The box body IA, which is formed by both the inner and outer boxes and the breaker, is heated in advance to an appropriate temperature with both the upper and lower jigs 70, 76 and the nests 77-
80, and a foaming operation is performed. Lower jig 7
Since the back plate of the outer case 16 is configured to protrude rearward from the back plate of the outer case 26, the outer case 6 is formed with a step 76A corresponding to the rear plate. 77 is a bottom insert that can be placed at the bottom of the upper case 4, and 79 and 80 are inner inserts that are inserted into the inner box of the lower case. The upper jig 70 has an upper insertion part 71 inserted into the inner box 15 of the upper case 4 and a non-insertion part 7 inserted into the door storage part 10 formed between the upper and lower cases.
2, left and right side parts (not shown) that abut on the left and right side plates of the box body from the outside, and each inlet 4 that abuts on the top plate 16A of the box body IA.
1 and a first exhaust passage 73B that communicates with the upper exhaust hole 42, and a second exhaust passage 74B that contacts the bottom plate 26B of the box IA and communicates with the lower exhaust hole 44. The bottom part 74 is formed with a bottom part 74, and is suspended so that it can be raised and lowered.

First, the box IA is placed on the lower jig 76'' with the opening 2 facing upward, and then each of the nests 77 to 80
Inner box 15,
25 is fixed by pressing the outer box 16, 26 and the breaker 17, 27. After fixing, insert the injection scissors 60 up to the injection port 41, push open the self-closing cap, and fill the entire space Q corresponding to the lower storage chamber with foaming stock solution W1 such as hard polyurethane toward the spaces corresponding to the left and right side walls. Inject a sufficient amount (this is called a predetermined amount) (at this time, an insulating pipe 50 may be used to guide the flow)
. Then, after a predetermined time (for example, about 10 seconds) set approximately equal to the time required for the injected stock solution to foam and grow in the space Q and completely fill the left and right side walls of the lower storage chamber, the injection port is opened again. 41, an appropriate amount (this is referred to as a fixed amount) of the foaming stock solution W2 is injected to completely fill the space P corresponding to the upper storage chamber 12. Incidentally, the injected foaming stock solutions Wl and W2 perform radial foaming growth starting from the first arrival point. This growth progresses through the following stages: cream time, which changes from liquid to foam, geltite, which slows down the growth rate in the foam state, tack-free time, which weakens adhesive strength, and foam time, which stops growing and solidifies.
, the foamed heat insulating material 18.28 is completely filled in Q.

The gas in the space Q is then exhausted to the outside through the lower exhaust hole 44 and the second exhaust path 74B, and is gradually exhausted from the breaker exhaust hole 43. On the other hand, the gas in the space P is exhausted from the upper exhaust hole 42 and the first exhaust path 73B.

As described above, there is a primary injection in which a predetermined amount of stock solution is injected from the injection port toward the space Q corresponding to the storage chamber on the far side from the injection port (enough to fill the space Q), and this primary injection. After a period of time (predetermined time) in which the growth of the stock solution reaches the space P corresponding to the storage chamber near the injection port, a certain amount (sufficient to fill this space P) is injected. By performing the secondary injection separately, a predetermined amount of the stock solution W1 is filled into the space Q, and a fixed amount of the stock solution W2 is used to fill the space Q.
can be filled into the space P independently, and it is possible to solve the problem that it is difficult to spread the heat insulating material in each space compared to the case of normal one-time injection. This is particularly effective when the structure of the box IA is complex. Furthermore, it is possible to efficiently fill a box with a heat insulating material as in this example, which is located away from the injection port and has a large filling volume and a structurally complicated space. and,
Insulation material 2 of the first injection that has grown in the connecting part of the rain space
8, the growth of the undiluted solution due to the secondary injection is relaxed, promoting the growth to the unfilled portions in the space Q, and improving the filling of the heat insulating material in each space.

On the other hand, it is now possible to perform integral foaming on insulation boxes for which the position of the product outlet is different and for which integral foaming has not been performed. The work of connecting and the work of concealing the connected parts can be eliminated, the beauty of the finished heat-insulating box is not spoiled, and the work involved in manufacturing the heat-insulating box is facilitated. In addition, since it is composed of integral foam,
Compared to a connected type structure, it is easier to make the insulation performance of the insulation wall uniform, and its structural strength can be improved.

〔Effect of the invention〕

As detailed above, a predetermined amount of foaming stock solution is injected as the first injection into the space corresponding to the storage chamber on the far side from the multiple injection ports formed on the top wall or bottom wall of the box. The foam grows in the space sequentially within a predetermined time, and progresses toward the space corresponding to the storage chamber on the side closer to the injection port, and the elapse of a predetermined time set to the time required for the progress up to this point. After that, a certain amount of the foaming stock solution is injected as a secondary injection, which weakens the growth toward the spacing and promotes the growth into the unfilled portions of each space. In addition, in the second injection, the foaming solution is allowed to foam and grow only in the space near the injection port, so that foaming and growth can occur almost independently in each space, and the insulation material that tends to form in the space near the injection port is This can solve the problem of difficulty.

On the other hand, the side walls of the heat insulating box formed by this method can be made of integral foam heat insulating material. For this reason,
The weight of the insulating box is supported by the integrally foamed side walls, improving the structural strength of the insulating box, and the insulating walls that uniquely form the storage room are stacked one on top of the other. This eliminates the need for additional work, and also eliminates the need for a special covering member that prevents the connecting portion from being seen from the outside.

[Brief explanation of drawings]

Each figure shows an embodiment of the present invention. Figures 1 and 2 are illustrations of the first and second injections of the foaming stock solution into the box, respectively, and 3rM is the right side of the heat-insulating box. Sectional view at the wall,
Figure 4 is a cross-sectional view of the box fixed to the foaming jig, Figure 5
The figure is a cross-sectional view of the vicinity of the inlet, Figure 6 is a horizontal cross-sectional view of the communicating part of the side wall, Figure 7 is a vertical cross-sectional view of the insulation box, and Figure 8 is a partial cross-sectional perspective view of the insulation box from the rear. It is a diagram. 1...Insulated box body, IA...Box body, 12...
・Upper storage room, 15.25...Inner box, 16.
26... Outer box, 22... Lower storage compartment, P, Q
...Space, 18.28...Insulation material, Wl, W
2... Foaming stock solution.

Claims (1)

[Scope of Claims] 1. In an insulated box body comprising a lower storage chamber whose top surface is an outlet for taking out articles, and an upper storage chamber whose front surface is an outlet for articles, each of the lower storage chamber and the upper storage chamber A heat insulating box body characterized by a side wall made of integral foam heat insulating material. 2. In an insulated box body comprising a lower storage chamber with an article outlet on the top surface and an upper storage chamber with the front surface as an article outlet, the inner box and the outer box are combined to form the box body. , a plurality of injection ports are provided on the top wall or the bottom wall of the box body, the box body is fixed to a foaming jig, and a plurality of injection ports are provided between the inner and outer boxes corresponding to the storage chamber on the side far from the injection ports. A method for producing a heat insulating box, characterized in that a fixed amount of foaming stock solution is injected, and after a predetermined period of time, a fixed amount of stock solution is injected again.