JPS6038629B2 - refrigerator door - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat insulating door that is pivotably attached to the front opening of a heat insulating box such as a refrigerator, and is particularly designed to improve the heat insulating performance of the heat insulating door.

Conventionally, in an insulated door in which a polyurethane insulation material is filled in the space inside the door body, which is formed by surrounding the outer peripheral green part of the opposing outer and inner panels with a decorative frame, the performance as an insulating wall depends on the material. Determined by specific heat transfer resistance and wall thickness.

In order to improve the insulation performance of an insulated wall with a constant thickness, it is better to stand the insulated door vertically during the manufacturing process and inject the foaming agent stock solution with the insulated door horizontally. Foaming the heat insulating material of a heat insulated door will make the door body stand up because the insulation performance is better in case of cell arrangement, shape, etc. A so-called vertical foaming method is used. This is because in the case of vertical foaming, when the injected stock solution foams and quickly rises in a space surrounded by walls, the cell arrangement and shape that are convenient for improving insulation performance are formed. is thought to be the cause.

However, in vertical foaming, if the thickness of the insulation wall is increased beyond a certain level, the foaming will become like diffusion bubbles, the effect of the vertical foaming method will weaken, and the cell condition will not be much different from that of horizontal foaming, resulting in insulation. Since the performance deteriorates, even if the wall thickness is increased and the amount of heat insulating material used is increased, there is a drawback that the heat insulation performance cannot be improved to a certain extent.

The present invention solves the above drawbacks and provides a heat insulating door that can be filled with a heat insulating material without deteriorating the heat insulating performance even when the wall thickness is increased.

The present invention will be described in detail below with reference to the illustrated embodiments.
2 is the refrigerator body, 2 is the door body that opens and closes the front opening of the refrigerator body, 3 is the outer plate that constitutes this door body, 4 is the inner plate, and 5 is the outer plate 3 and the inner plate 4. It is a decorative frame that surrounds the outer circumferential edge of the frame, and one end of the frame has a groove 6 into which the outer circumferential edge of the outer plate 3 is fitted, and the other end has the outer circumferential edge of the inner plate 4 attached, and a gasket (not shown) is attached. A mounting groove 7 is formed respectively.

Reference numeral 8 denotes a shielding plate made of an iron plate, a synthetic resin sheet, paper, or the like, and, like the outer plate 3, its outer circumferential end twill is fixed at its outer peripheral edge by a locking groove 9 formed in the decoration 5.

Reference numerals 10 and 11 denote a heat insulating layer formed by dividing the inside of the door body 2 into two in the wall thickness direction by this shielding plate, and each has holes 12 and 13 in the decorative frame 5 for injecting polyurethane heat insulating material. There is.

FIG. 3 shows an apparatus for injecting and filling a heat insulating foam material into a heat insulating door. As shown in the drawing, after setting the door body 2 vertically in a urethane foaming jig 12, the nozzle of a predetermined urethane injection machine 20 is shown. Injection hole 12, 1 with 21 closed in decorative frame 5
3, and the same amount of polyurethane stock solution is injected into the spaces of each heat insulating material layer 10 and 11 almost simultaneously. The injected stock solution starts foaming from the bottom, but even if the wall thickness A of the insulation door 2 becomes thicker, it is divided by the shielding plate 8, so the thickness a of the insulation layers 10 and 11 becomes narrower, and the vertical As a result of foaming, the cells are uniformly raised and formed without the bubbles diffusing within the space, thereby improving the heat insulating performance as a heat insulating wall.

Further, foaming pressure is applied to the shielding plate 8 when the insulation material is foamed, but even if the shielding plate 8 is made of paper, synthetic resin sheet, or other non-rigid material, the foaming in each of the insulation material layers 10 and 11 will occur at the same time. As the filling progresses, the respective foaming pressures are balanced, and there is no risk that the shielding plate 8 will be deformed.

The door body 2, which has been filled with insulation foam, is taken out from the urethane foam jig 12, a gasket is placed in the groove 7, an inner plate (not shown) for storing food is attached, and the refrigerator body 1 is removed.
The refrigerator door is pivoted to the front entrance so that it can be opened and closed, and the refrigerator door is completed.

As described above, in the present invention, the shielding plate is divided in the wall thickness direction within the door body to divide the wall thickness into two, so even if the insulation wall thickness of the insulation door is thick, the vertical foaming The present invention provides a heat insulating door having a good heat insulating material with improved heat insulating performance.

In the above embodiments, the door body 2 has a structure in which the inner surface plate 4 is attached. However, conventionally, the inner surface plate 4 is added to provide strength as a rigid body of the heat insulating door. Depending on the size of the main body 2, etc., the inner plate 4 may be
For doors that do not require the inner panel 4, or for doors whose size is limited to the central part of the door and whose outer edges are not all attached to the decorative frame, when injecting and foaming insulation, the insulation layer can be removed by the urethane pick-up 14. 11 is formed, it is clear that the same effect as above can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a refrigerator equipped with a heat insulating door according to the present invention, Fig. 2 is a sectional view of the door taken along the Rolo line of Fig. 1, and Fig. 3 shows a state in which foam insulation material is injected into the door according to the present invention. It is an explanatory diagram. In the figure, 2 is the door body, 8 is a shielding plate, and 10 and 11 are heat insulating material layers. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In a door that forms a heat insulating door by injecting and foaming a foam heat insulating material into the door body, a shielding plate is disposed within the door body so as to be divided in the wall thickness direction, and multiple heat insulating material layers within the body are provided. A refrigerator door characterized by foam insulation material injected into each.