JPH0438228Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an insulating door mainly used for refrigerators and the like.

[Conventional technology]

This type of heat-insulating door, which has been conventionally used in refrigerators, etc., has an outer door panel 2 and an inner door panel 3 facing each other, as shown in FIG. A door frame 1 is provided around the peripheral edge of the door frame 1, and a protruding piece 5 formed to protrude inward from the rear side peripheral edge of the door frame 1 and an outer peripheral edge 6 of the door inner plate 3 are joined,
The gap formed by the door outer panel 2, the door inner panel 3, and the door frame 1 is filled with a foamed heat insulating material 4 (for example, Utility Model Application No. 55-150985, Utility Model Application Publication No. 1983-1983).
Publication No. 78491, Publication of Utility Model Application No. 1983-78492, Publication No. 78492 of Utility Model Application Publication No. 1983
-Refer to Publication No. 178585, etc.).

[The problem that the idea attempts to solve]

However, in the structure in which the protruding piece 5 and the outer peripheral edge 6 of the inner door plate are simply joined together as described above, the door frame 1 deforms during operation of the refrigerator, causing the heat insulating door 7 to warp as shown in FIG.

In other words, when the refrigerator is in operation, the inner door side is cooled and kept at a low temperature, while the outer door side is kept at a relatively high indoor temperature. A difference in shrinkage occurs in the foamed heat insulating material 4 near the inner door panel side and near the outer door panel side.
Along with this, an internal force is applied to the door inner plate 3 bonded to the foam insulation material 4 to deform it in the direction of the door outer plate, and the protruding piece 5 of the door frame body is moved by the outer peripheral edge 6 of the door inner plate. The heat insulating door 7 is pushed in toward the outer panel of the door.
As shown in the plan view of the refrigerator in FIG. 5, although not shown, the insulation door 7 seen from the side of the refrigerator similarly bulges toward the front side of the door and deforms into an arched shape. As a result, the airtightness of the opening of the refrigerator body is impaired, and as a result, the cold air blocking function of the door is reduced, which has a negative effect on the food inside the refrigerator. It has problems such as corrosion and stains on the surface of the decorative board, which have an adverse effect on the quality and appearance.

The present invention has been developed in consideration of the above-mentioned conventional problems, and its purpose is to provide heat insulation that can suppress the deterioration of airtightness due to the difference in temperature between the inside and outside when configured as an opening/closing door of a refrigerator, for example. It's about providing a door.

[Means to solve the problem]

Therefore, in the heat insulating door of the present invention, the peripheral edge of the door outer panel covering the front side is joined to the front end side edge of the door frame body having a predetermined width dimension in the front and rear direction, while the rear end side of the door frame body The periphery of the door inner plate facing the door outer plate is joined to the inner end side of a protruding piece that protrudes inward from the edge almost parallel to the door outer plate, and the door outer plate, the door inner plate, and the door are connected. In an insulated door formed by filling a gap formed with a frame with a foamed heat insulating material, the deformability is locally increased at a position outside the joining area of the door inner plate in the protruding piece of the door frame. This feature is characterized in that a cutout groove is provided to partially reduce the thickness of the protruding piece.

[Effect]

According to the above configuration, the protruding piece to which the peripheral edge of the door inner plate is joined is easily deformed in the region near the notch groove where the thickness is partially reduced. As a result, when a force that deforms the door inner plate is generated due to the temperature difference between the door inner plate side and the door outer plate side, the area near the notch groove is deformed in response to this force, and as a result, The force acting on the door frame body and the door outer panel side outside the notch groove becomes smaller. Therefore, the deformation due to the above force is limited to the area from the inner door plate to the area near the notch groove of the protruding piece, and the door frame and door outer plate side outside the protruding piece are almost not deformed. It will be maintained in this state. Therefore, when the heat insulating door is configured as an opening/closing door of a refrigerator, for example, the rear end surface on the outside of the protruding piece of the door frame, which serves as a sealing surface with the refrigerator body, is held in an undeformed state. , a decrease in airtightness is suppressed.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The heat insulating door in this embodiment is applied to a refrigerator, and the door frame 11 is made of a rectangular frame shape as a whole, and a door outer plate 1 is provided inwardly on the front peripheral edge of the door frame 11.
A pair of opposing holding pieces 20a and 20b form a fitting groove 20 for holding the door outer plate holding part 2.
1 is formed, and a gasket mounting portion 16 and an inwardly protruding piece 15 are formed at the peripheral end on the back side thereof. The gasket mounting portion 16 has a cross-sectional shape capable of holding a packing gasket (not shown), and the protrusion piece 15 has a V-shaped cutout groove 17 extending along the circumferential edge of the protrusion piece 15. The peripheral end side of the protruding piece from the notch groove 17 is the door inner plate holding part 1
It is configured as 8. The door frame 11 includes the door outer plate holding portion 21, the gasket mounting portion 16, and the protruding piece 15, which are integrally formed by extrusion molding from synthetic resin or the like. Here, the notch groove 17 may have a U-shape or other shape in cross section, or the notch groove 17 may be formed intermittently in the direction along the circumferential edge of the protruding piece 15. good. The door outer plate 12 is formed of a thin metal plate or the like, and its outer peripheral edge 22 is integrally fitted with a door outer plate holding portion 21 formed on the door frame 11. The door inner plate 13 is formed of a thin synthetic resin plate or the like, and its outer peripheral edge 19 is joined to the door frame 11 by a door inner plate holding portion 18 formed on the door frame 11. The reinforcing angle member 23 has a cross-sectional shape that can fit inside the door frame 11, and is fixed to the inside of the door frame 11. the door frame 11;
The gap formed between each member of the door outer panel 12 and the door inner panel 13 is filled with a foamed heat insulating material 14, thereby integrally forming the heat insulating door of the present invention.

When operating the refrigerator in the above configuration,
The inner side of the door is cooled and kept at a low temperature, while the outer side of the door is kept at a relatively high indoor temperature.Due to this temperature difference, the temperature difference between the inner side of the door and the outer side of the door A difference in shrinkage occurs in the foamed heat insulating material 14 near the sides. Accordingly, an internal force acts on the door inner plate 13 bonded to the foamed heat insulating material 14 to deform it in the direction of the door outer plate. At this time, the protruding piece 15 of the door frame
The projecting piece 15 of the door frame body is provided with a notch groove 17 near its peripheral edge, and from the notch groove 17 the circumference Since the outer peripheral edge 19 of the door inner plate is joined by the inner door plate holding portion 18 extending to the end, the door inner plate holding portion 18 only deforms toward the door outer plate until the door frame 11 is deformed. It doesn't reach that point. Further, since the deformation of the door inner plate holding portion 18 is absorbed by the foamed heat insulating material 14 acting as a buffer, the internal force acting on the door inner plate 13 is absorbed by the door inner plate holding portion 18 and the door frame 1.
It has almost no effect on 1. The reinforcing angle members 23 fixed to the inside of the door frame 11 are used to make the heat insulating door strong against external forces, but also function as resistance against deformation of the door frame 11.

As described above, the closer the notch groove 17 is formed to the peripheral edge of the protruding piece 15 of the door frame 11, the smaller the influence of the deforming internal force acting on the door inner plate 13 on the door frame protruding piece 15. By appropriately setting the location of the cutout groove 17, deformation of the door frame 11 can be further reduced. Also, in this case,
Since the door inner plate holding portion 18 is formed to be dimensionally short, the packing gasket attached to the gasket mounting portion 16 does not come into direct contact with the outer circumferential edge 19 of the door inner plate, and therefore the outer circumferential edge of the door inner plate This makes it possible to prevent the packing gasket from being deformed due to the turning up of the packing gasket 19. In this embodiment, the notch groove 17
The cross-sectional shape is V-shaped, and a strip is provided along the circumferential edge of the protruding piece 15 of the door frame body, but this is done considering the convenience of work, and the cross-sectional shape is Regardless of the structure, even if the structure is formed intermittently, the same function as described above can be achieved. Then, the notch groove 17 is inserted into the protruding piece 15 of the door frame.
When formed intermittently along the circumferential edge, the door inner plate holding portion 18 can have sufficient strength compared to when formed continuously.

As explained above, the heat insulation door according to the present invention is
The influence on the door frame of the deforming internal force acting on the door inner plate due to the temperature difference between the door inner plate side and the door outer plate side is alleviated by the notch groove provided in the protruding piece of the door frame body. This structure prevents the door frame from deforming due to temperature differences between the front and back of the insulated door, and prevents warping of the insulated door, without increasing manufacturing costs compared to conventional ones. The airtightness of the frontage can be maintained. As a result, conventional problems such as the negative effect on the food inside the refrigerator due to a decrease in the cold air blocking function of the door, and the corrosion and staining of the packing gasket and the surface of the refrigerator decorative panel caused by condensation caused by the cold air flowing out have been eliminated. It is possible to maintain the quality and appearance of refrigerators, etc.

[Effect of idea]

As described above, the heat insulating door of the present invention locally increases deformability in the protruding piece that protrudes inward from the rear edge of the door frame at a position outside the joint area of the inner door plate. The structure is such that a cutout groove is provided to partially reduce the thickness of the protruding piece.

As a result, when a force that deforms the door inner plate is generated due to a temperature difference between the door inner plate side and the door outer plate side, the deformation will occur from the door inner plate to the area near the above-mentioned notch groove of the protruding piece. The deformation is limited to a limited area, and the door frame body and door outer panel side outside the protruding piece are maintained in a substantially undeformed state. Therefore, when the heat insulating door is configured as an opening/closing door of a refrigerator, for example, the rear end surface on the outside of the protruding piece of the door frame, which serves as a sealing surface with the refrigerator body, is held in an undeformed state. This has the effect of suppressing a decrease in airtightness.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention, and is a perspective view of an insulating door used in a refrigerator, seen from the back side, Fig. 2 is a sectional view taken along the line A-A' in Fig. 1, FIG. 3 is a partial sectional view showing an enlarged main part of FIG. 2;
FIG. 4 is a partial cross-sectional view of a conventional refrigerator door, and FIG. 5 is a plan view of the conventional refrigerator door when the refrigerator is in operation. 1 is a door frame body, 2 is a door outer plate, 3 is a door inner plate, 4 is a foam insulation material, 5 is a protruding piece, 6 is an outer periphery of the door inner plate, 7 is an insulating door, 8 is a packing gasket, 11 is a A door frame body, 12 is a door outer panel, 13 is a door inner panel, 14 is a foam insulation material, 15 is a protruding piece, 16 is a gasket mounting part,
17 is a notch groove, 18 is a door inner plate holding part, 19 is an outer periphery of the door inner plate, 20 is a fitting groove, 20a, 20b are holding pieces, 21 is a door outer plate holding part, 22 is an outer periphery of the door outer plate,
23 is a reinforcing angle member.

Claims (1)

[Scope of Claim for Utility Model Registration] While the peripheral edge of the door outer panel covering the front side is joined to the front end side edge of a door frame body having a predetermined width dimension in the front-rear direction, the rear end side edge of the door frame body On the inner end side of the protruding piece that protrudes inward from the part almost parallel to the door outer plate,
In an insulated door formed by joining the periphery of the door inner plate covering the rear side and filling the gap formed by the door outer plate, the door inner plate, and the door frame with a foam insulation material, the door frame protrudes. A heat insulating door characterized in that a notch groove is provided at a position outside the joining area of the door inner plate in the piece to partially reduce the thickness of the protruding piece in order to locally increase deformability.