JPH10259987A - Heat insulating structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leakage of a stock solution of urethane, to reduce the cost and to simplify a manufacturing process by providing projecting thread parts on the inner surface of at least one of the walls of a heat insulating structure forming a filling space, in the lengthwise direction of the wall. SOLUTION: A heat insulating door 10 is composed of an outer plate 12 made of metal, an inner plate 14 made of synthetic resin and upper and lower cap members 16 and 18. The outer plate 12 is prepared by bending the opposite sides of a rectangular metal plate, while the inner plate 14 is molded integrally out of the synthetic resin. Guiding projecting thread parts 42 and 44 for guiding a stock solution N of urethane are provided by integral molding respectively above and below an injection port 30 in the rear of the inner plate 14. Since the stock solution N of urethane flows along a space between the paired guiding projecting thread parts 42 and 44, while it foams, it flows in the lengthwise direction in a larger quantity than in the widthwise direction and expands elliptically as a whole and, therefore, a foaming pressure is prevented from being applied locally. Therefore the inner plate 14 is prevented from being deformed and, besides, it is possible to make the foaming pressure uniform and to prevent leakage from engaging projecting parts 36 and pawl parts 38 and 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating structure having a heat insulating structure in which urethane foam is filled inside, such as a heat insulating door of a refrigerator.

[0002]

2. Description of the Related Art In recent refrigerators, drawer-type heat-insulating doors have been provided, and in such drawer-type heat-insulating doors, the ratio of the vertical and horizontal dimensions may be 1: 2 or more. is there.

[0003] Such an insulated door has an outer shell formed of a metal outer plate, an inner box made of synthetic resin, and a cap member inserted above and below the inner box, and is formed by the outer shell. Urethane stock solution is injected into the filling space and foamed.

[0004]

In this foaming step, foaming is performed by pressing the urethane jig while moving the heat-insulating door by a belt conveyor, and the next urethane cure is performed from one urethane jig. While moving to the fixture, there is nothing to hold down the insulation door.

For this reason, conventionally, as shown in FIG. 14, in order to prevent the inner plate 114 from falling off and coming off from the outer plate 112, claws 116 are engaged with cap members 118 and 120 at upper and lower ends of the inner plate 114. After the mixing, the urethane stock solution N was injected from the injection port 122.

However, as shown in FIG. 15, the foaming pressure at the time of foaming is locally applied to the inner plate 114, and the engagement between the cap members 118 and 120 and the inner plate 114 is deteriorated and disengaged. There was a problem that leakage occurred.

In this case, it is possible to add a fixing tape for preventing the detachment or a lift tape for preventing the leakage of the urethane stock solution N. However, if such members are added, However, there has been a problem that the cost increases and the number of manufacturing steps increases.

Accordingly, the present invention has been made in view of the above problems, and provides an insulated door capable of preventing deformation of an inner plate during urethane foaming.

[0009]

According to a first aspect of the present invention, there is provided a heat insulating structure having a filling space for filling urethane foam therein, wherein the heat insulating structure forming the filling space is provided. A ridge is provided on the inner surface of at least one of the plurality of walls along the longitudinal direction of the wall.

The heat insulating structure according to a second aspect is the heat insulating structure according to the first aspect, wherein the wall is provided with a plurality of the ridges.

According to a third aspect of the present invention, there is provided the heat insulating structure according to the second aspect, wherein an inlet for injecting the undiluted solution of the urethane foam is provided between the plurality of ridges provided on the wall. It is.

According to a fourth aspect of the present invention, in the heat insulating structure according to the first aspect, the wall is made of a synthetic resin, and
It is formed integrally with the wall.

According to a fifth aspect of the present invention, in the heat insulating structure according to the first aspect, a reinforcing metal plate is disposed on an inner surface of the wall, and the ridge portion is formed by bending the metal plate. It is.

According to a sixth aspect of the present invention, in the heat insulating structure according to the first aspect, the ridge portion is bent in the shape of a "ku" so as to extend toward both sides in the longitudinal direction of the wall. is there.

According to a seventh aspect of the present invention, in the heat insulating structure according to the first aspect, a ratio of a dimension in the short direction to a dimension in the longitudinal direction of the wall is 1: 2 or more. The heat insulating structure according to claim 8 is the heat insulating structure according to claim 1, wherein at least opposing walls of the plurality of walls of the heat insulating structure are formed by a pair of plates, and a gap between the pair of plates is closed by a cap member. hand,
The filling space is formed.

A heat insulating structure according to a ninth aspect of the present invention is a heat insulating structure having a filling space for filling urethane foam therein, wherein a bead portion protruding from an outer surface of a wall of the heat insulating structure forming the filling space. Are provided with reinforcing ribs inside.

In the heat insulating structure of the first aspect, when the urethane stock solution is injected into the filling space, the urethane stock solution flows along the ridge provided on the inner surface of the wall, so that the urethane stock solution is locally collected. And foaming can be performed uniformly.

In the heat insulating structure according to the second aspect, since the urethane stock solution injected into the filling space flows between a plurality of ridges provided on the inner surface of the wall, the urethane stock solution may be locally collected. And foaming can be performed uniformly.

In the heat insulating structure according to the third aspect, since the urethane stock solution is injected from the injection port located between the plurality of ridges, the urethane stock solution reliably flows between the plurality of ridges.

According to the heat insulating structure of the fourth aspect, since the ridge is integrally formed with the wall made of synthetic resin, the ridge can be easily manufactured.

According to the heat insulating structure of the fifth aspect, since the reinforcing metal plate is provided with the ridge, the wall is reinforced.
The ridge can be easily formed.

In the heat insulating structure according to the sixth aspect, since the ridges are provided in the shape of "" so as to spread on both sides, the urethane stock solution can flow so as to spread toward both sides.

According to the heat insulating structure of the present invention, even when the ratio of the dimension in the short direction to the dimension in the longitudinal direction of the wall is 1: 2 or more, the urethane stock solution does not collect locally and foaming does not occur. Can be performed uniformly.

According to the heat insulating structure of the eighth aspect, since the urethane stock solution does not locally collect and foaming can be performed uniformly, the cap member does not come off due to the foaming pressure.

According to the heat insulating structure of the ninth aspect, since the reinforcing rib is provided on the back surface of the beat portion, deformation of the wall due to urethane foaming pressure can be prevented.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
A description will be given based on FIG.

FIG. 2 is an external view of the refrigerator 1 using the heat insulating door 10 of the present embodiment.
Is provided as a drawer-type insulated door disposed in a freezing room. That is, in FIG. 2, the second or third stage heat-insulated door corresponds to it. The vertical dimension of this heat insulating door 10 is 220 mm, and the horizontal dimension is 665 m.
m, and the ratio of the vertical and horizontal dimensions is 1: 2 or more.

Hereinafter, the heat insulating door 10 will be described.

As shown in an exploded perspective view of FIG. 3, the heat insulating door 10 includes a metal outer plate 12, a synthetic resin inner plate 14,
It is composed of upper and lower cap members 16 and 18.

The outer plate 12 is formed by bending both sides of a rectangular metal plate to form a side plate portion 22, and has an extension portion 22 that extends further inward from an end of the side plate portion 20. I have. Further, a concave portion 24 serving as a handle of the heat insulating door 10 is formed in the upper central portion of the outer plate 12.

The inner plate 14 is made of a synthetic resin and is integrally formed. A gasket groove 26 for fitting a gasket is provided in a peripheral portion of the surface of the inner plate 14. As shown in FIG. 6, an engagement protrusion 36 protrudes from the back surface of the gasket groove 26. Beat portions 28 for guiding cool air are provided above and below the surface of the inner plate 14, respectively.
Are provided along the left-right direction.

An injection port 30 for injecting the urethane undiluted solution N is opened at the center of the inner plate 14. On both sides of the inlet 30, a pair of fitting recesses 34, 34 for mounting a metal mounting plate 32 are provided on the back surface of the inner plate 14. An attachment plate 32 is attached to the pair of fitting recesses 34, 34, and an arm member (not shown) for supporting the heat insulating door 14 from the surface of the inner plate 14 is attached to the attachment plate 32 by bolts.
Attach to In addition, a bolt hole 46 through which a bolt for attaching the arm member penetrates is opened in the inner plate 14.

Further, the injection port 3 on the back surface of the inner plate 14
Guide projections 42 and 44 for guiding the urethane undiluted solution N are integrally formed above and below 0, respectively. The guide projections 42 and 44 are provided substantially parallel to each other in the left-right direction.

The cap member 16 is attached to the outer plate 12 by the inner plate 14.
After sliding, is fitted over the upper part, and the cap member 18 covers the lower part. In order to ensure the engagement between the cap member 16 and the inner plate 14, a claw portion 38 projects from the cap member 16 and engages with the engaging protrusion 36 of the inner plate 14, as shown in FIG. Further, similarly, the claw portion 40 protrudes from the cap member 18,
It engages with the engagement protrusion 36.

The assembling process of the heat insulating door 10 having the above configuration will be described.

(1) The fitting recess 3 on the back surface of the inner plate 14
Attach metal mounting plates 32, 32 to 4, 4 respectively.

(2) As shown in FIG. 3, the inner plate 14 is slid and fitted along the inside of the pair of side plate portions 20 of the outer plate 12. The inner plate 14 is fixed by a pair of extending portions 22, 22.

(3) Outer plate 12 assembled as shown in FIG.
The cap members 16 and 18 are fitted on the upper and lower sides of the inner plate 14 and the inner plate 14, respectively. In this case, as shown in FIG. 6, the claw portions 38 and 40 of the cap members 16 and 18 are engaged with the engagement protrusions 36 of the inner plate 14.
To engage. Thereby, the outer plate 12, the inner plate 14, and the cap members 16, 18 are fixed to each other.

(4) Cover the bolt holes 46 of the inner plate 14 for attaching the arm members with tape.

(5) The urethane undiluted solution N is injected and foamed into the filling space 48 inside the heat insulating door 10 from the inlet 30. In this case, after the injection of the urethane stock solution N is completed, the injection port 30 is closed by the tape 50 as shown in FIG.

As shown in FIG. 1, the injected urethane stock solution N flows along the space between the pair of guide ridges 42 and 44 while foaming, so that the amount flowing in the longitudinal direction is reduced by the amount flowing in the short direction. As shown in FIG. 7, the foaming pressure is increased as a whole, so that the foaming pressure is not locally applied unlike the related art. Therefore, the inner plate 14 is not deformed as in the related art.

In the present embodiment, the flow of the urethane stock solution N inside the heat insulating door 10 can be improved by the guide ridges 42 and 44, and the urethane foaming pressure can be made uniform. Since no local pressure is applied to the plate 14, the inner plate 14 is disengaged, and the engaging projections 36, which are fitting portions between the cap members 16 and 18 and the inner plate 14, are provided.
Also, leakage of the urethane stock solution N from the claw portions 38 and 40 can be prevented.

(Second Embodiment) A second embodiment will be described with reference to FIGS.

The difference between the present embodiment and the first embodiment is that reinforcing ribs 52 are provided at regular intervals in the concave portion 29 located on the back side of the beat portion 28.

By providing the reinforcing ribs 52,
The deformation of the gasket groove 26 due to the urethane foaming pressure can be further prevented, and the disengagement between the engaging projection 36 and the claw portions 38 and 40 can be prevented.

(Third Embodiment) A third embodiment will be described with reference to FIG.

The difference between the present embodiment and the first embodiment lies in how the guide ridges 42 and 44 are provided.

That is, in this embodiment, the guide ridge 4
Instead of integrally molding the base members 2 and 44 with a synthetic resin, a metal plate 54 on which a guide ridge 58 is extended is fixed by a bolt 56 along the back surface side of the beat portion 28.

By providing such a metal plate 54, the inward warpage of the cap members 16 and 18 can be prevented, and the guide projection 58 can be provided, so that the manufacturing process can be omitted.

(Fourth Embodiment) A fourth embodiment will be described with reference to FIG.

The difference between this embodiment and the first embodiment lies in the shapes of the guide ridges 42 and 44.

That is, in the first embodiment, the guide projections 42, 44 are provided in parallel along the left-right direction of the heat insulating door 10, but in the present embodiment, as shown in FIG.
Fold it at the 0 part so that it spreads on both sides
And are integrally formed of synthetic resin. That is, in the injection port 30, the interval between the pair of guide projections 42 and 44 is narrowed, and the guide projections 42 and 44 are inclined so as to be wide on both sides.

As a result, the urethane stock solution N injected from the injection port 30 flows so as to spread toward both sides, so that a more uniform foaming pressure can be applied.

(Fifth Embodiment) A fifth embodiment will be described with reference to FIGS.

The difference between this embodiment and the fourth embodiment is that
The guide ridges formed in the shape of a “<” are provided by a reinforcing metal plate 60 instead of being integrally formed.

That is, as shown in FIG. 12, a metal plate 60 having a guide ridge portion 64 formed in the shape of a "K" by inclining so that the center portion becomes more inward, is placed on the back side of the beat portion 28. Is fixed by bolts 62.

Thus, the inward warpage of the cap members 16 and 18 can be prevented, and the metal plate 6
The guide ridge portion 64 is formed simply by attaching 0.

[0058]

According to the heat insulating structure of the first aspect, when the urethane stock solution is injected into the filling space, the urethane stock solution flows along the ridge provided on the inner surface of the wall, so that the urethane stock solution is locally formed. Without aggregation, foaming can be performed uniformly. Therefore, the wall is not deformed by the foaming pressure.

In the heat insulating structure according to the second aspect, since the urethane stock solution injected into the filling space flows between a plurality of ridges provided on the inner surface of the wall, the urethane stock solution may be locally collected. And foaming can be performed uniformly. Therefore, the wall is not deformed by the foaming pressure.

In the heat insulating structure according to the third aspect, since the urethane stock solution is injected from the injection port located between the plurality of ridges, the urethane stock flows reliably between the plurality of ridges.

According to the heat insulating structure of the fourth aspect, since the ridge is integrally formed with the synthetic resin wall, the ridge can be easily manufactured.

According to the heat insulating structure of the fifth aspect, the ribs are provided on the reinforcing metal plate, so that the wall is reinforced and
The ridge can be easily formed.

In the heat insulating structure according to the sixth aspect, since the ridges are provided in the shape of "" so as to spread on both sides, the urethane stock solution can flow so as to spread toward both sides.

According to the heat insulating structure of the present invention, even when the ratio of the short side dimension to the long side dimension of the wall is 1: 2 or more, the urethane stock solution does not collect locally and foaming does not occur. Can be performed uniformly.

According to the heat insulating structure of the eighth aspect, since the urethane stock solution does not locally collect and foaming can be performed uniformly, the cap member does not come off due to the foaming pressure.

According to the heat insulating structure of the ninth aspect, since the reinforcing ribs are provided on the back surface of the beat portion, deformation of the wall due to urethane foaming pressure can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a heat insulating door showing a first embodiment of the present invention, in a state where urethane foaming is occurring.

FIG. 2 is a perspective view of the refrigerator of the first embodiment.

FIG. 3 is an exploded perspective view of the heat insulating door of the first embodiment.

FIG. 4 is a front view of the inner plate.

FIG. 5 is a rear view of the inner plate.

FIG. 6 is an enlarged vertical sectional view of a main part of the heat insulating door.

FIG. 7 is a rear view of the inner plate showing a flow of urethane when urethane is injected and foamed.

FIG. 8 is an enlarged longitudinal sectional view of a main part of the heat insulating door of the second embodiment.

FIG. 9 is a back view of the inner plate of the second embodiment.

FIG. 10 is an enlarged longitudinal sectional view of a main part of a heat insulating door of a third embodiment.

FIG. 11 is a rear view of the inner plate of the heat insulating door of the fourth embodiment.

FIG. 12 is an exploded perspective view of an inner plate of a heat insulating door according to a fifth embodiment.

FIG. 13 is an enlarged longitudinal sectional view of a main part of a heat insulating door of a fifth embodiment.

FIG. 14 is a longitudinal sectional view of a conventional heat insulating door in a state where urethane is injected.

FIG. 15 is a longitudinal sectional view of the heat-insulating door in a state where urethane foaming is occurring.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Insulated door 12 Outer plate 14 Inner plate 16 Cap member 18 Cap member 20 Side plate part 22 Extension part 28 Beat part 30 Injection 42 Guide ridge part 44 Guide ridge part 48 Filling space

Claims (9)

[Claims] 1. A heat insulating structure having a filling space for filling urethane foam therein, wherein a projection is formed on an inner surface of at least one of a plurality of walls of the heat insulating structure forming the filling space. A heat insulating structure, wherein a portion is provided along a longitudinal direction of the wall. 2. The heat insulating structure according to claim 1, wherein a plurality of said ridges are provided on said wall. 3. The heat insulating structure according to claim 2, wherein an inlet for injecting the undiluted urethane foam is provided between the plurality of ridges provided on the wall. 4. The heat insulating structure according to claim 1, wherein said wall is made of a synthetic resin, and said ridge is formed integrally with said wall. 5. The heat insulating structure according to claim 1, wherein a reinforcing metal plate is disposed on an inner surface of the wall, and the ridge is formed by bending the metal plate. 6. The heat-insulating structure according to claim 1, wherein the ridge portion is bent in the shape of a "ku" so as to extend toward both sides in the longitudinal direction of the wall. 7. The structure according to claim 1, wherein the ratio of the dimension in the short direction to the dimension in the longitudinal direction of the wall is 1: 2 or more.
A heat insulating structure according to any one of the preceding claims. 8. A plurality of walls of the heat insulating structure, wherein at least opposing walls are formed by a pair of plates, and the space between the pair of plates is closed by a cap member to form the filling space. The heat insulating structure according to claim 1, wherein 9. A heat insulating structure having a filling space for filling urethane foam therein, wherein a reinforcing rib is provided inside a bead portion projecting from an outer surface of a wall of the heat insulating structure forming the filling space. A heat insulating structure provided.