JP2020128836A - Heat insulating door and refrigerator comprising the same - Google Patents

Abstract

To restrain condensation on a concave part that can be used as a handle.SOLUTION: A heat insulating door comprises a door 5a comprising an outer plate 11 and heat insulating materials 21 and 22, and also comprises: a frame body 13 arranged on a side periphery of the outer plate 11, and comprising a concave part 13a; and a door inside space 23 adjacent to a bottom part of the concave part 13a in a depth direction, and capable of exchanging heat with outside air via the front plate (outer plate) 11. The heat insulating materials comprise a first heat insulating material 21 opposed to the concave part 13a across the door inside space in the depth direction, and a second heat insulating material 22 opposed to the outer plate across the door inside space.SELECTED DRAWING: Figure 5

Description

The present invention relates to a heat insulating door and a refrigerator having the same.

In Patent Document 1, a molded heat insulating material 121 and a housing 117 as a space are provided side by side behind a front plate 112, and a vacuum heat insulating material 126 is arranged behind each of the molded heat insulating material 121 and the housing 117. Is disclosed (0026, FIG. 15). The molded heat insulating material 121 is adjacent to the bottom side of the housing 117.
A protective sheet 125 is arranged between the molded heat insulating material 121 and the vacuum heat insulating material 126 to prevent the vacuum heat insulating material 126 from being damaged (0019, FIG. 15). The side of the vacuum heat insulating material 126 is protected by the wall portion 123a of the molded heat insulating material 121 so as not to directly contact the door frame 111 (0026, 0027).
The storage part 117 may be a handle 21A, 22A into which an electric component may be inserted from the opening 118, or a user may insert a hand while leaving the space (0016).

JP, 2005-081706, A

In recent years, as in Patent Document 1, a recess that can be used as a handle is provided in a door.
Since the concave portion is made of, for example, a resin and may have a protrusion such as a burr, it may be damaged when the vacuum heat insulating material comes into contact therewith. For this reason, in Patent Document 1, it is considered that the member that is in contact with or adjacent to the recess is a molded heat insulating material.

Even though the heat insulating material is arranged, since the heat insulating thickness of the recessed portion is small, heat exchange relatively occurs between the low temperature chamber and the recessed portion. When the temperature of the recess decreases, there is a risk that dew will condense. For example, when the solid heat is conducted to the bottom of the housing 117 (the portion adjacent to the molded heat insulating material 121) of Patent Document 1 through the molded heat insulating material 121 and cool air reaches, the bottom of the housing 117 is formed by the molded heat insulating material 121. Since it is easy to continue cooling, dew condensation is likely to occur.

The present invention made in view of the above circumstances,
A heat insulating door having an outer plate and a heat insulating material,
A frame body that is arranged on the side periphery of the outer plate and has a recess,
A door inner space that is adjacent to the bottom of the recess in the depth direction and that can exchange heat with the outside air via the outer plate;
The heat insulating material is
A first heat insulating material facing the recess in the depth direction across the door inner space;
A second heat insulating material facing the outer plate with the door inner space interposed therebetween.

The perspective view of the refrigerator of the Example Exploded perspective view of the freezer compartment door of the embodiment Side sectional view of the freezer compartment door of the embodiment The figure which shows the isotherm around a recessed part calculated by simulation assuming that the inside of the door other than the vacuum heat insulating material behind the front plate of the example is urethane foam heat insulating material. Enlarged sectional view of the periphery of the concave portion of the embodiment Side sectional view of a freezer compartment door of another embodiment Enlarged cross-sectional view around the recess of another embodiment The figure which shows the modification of the length and thickness of the heat insulating material.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Similar components are designated by similar reference numerals, and similar description will not be repeated. The present invention is not limited to the following examples, but can be variously modified within the range in which the technical idea of the present invention is maintained.

FIG. 1 is a perspective view of the refrigerator of the embodiment. As a storage room of the refrigerator body 1, a refrigerating room 2, an ice making room 3, an upper freezing room 4, a freezing room 5, and a vegetable room 6 are provided. Further, doors 2a, 2b, 3a, 4a, 5a, 6a for closing the front opening of each storage chamber are provided. The upper freezing compartment door 4a closes the front opening of the upper freezing compartment 4, the ice making compartment door 3a closes the front opening of the ice making compartment 3, the freezing compartment door 5a closes the front opening of the freezing compartment 5, The vegetable compartment door 6a is a door that closes the front opening of the vegetable compartment 6. Although the freezer compartment door 5a will be described below, the same structure can be adopted for other doors.

FIG. 2 is an exploded perspective view of the freezer compartment door 5a. The freezer compartment door 5a includes an outer plate 11 arranged at the front and facing the outside of the refrigerator, an inner plate 12 inside the refrigerator arranged at the rear, and a frame body arranged at the periphery of the outer plate 11 and the inner plate 12. Have. Of the frame bodies, members arranged above and below the outer plate 11 and the inner plate 12 are referred to as an upper frame body 13 and a lower frame body 14, respectively. A first vacuum heat insulating material 21, a second vacuum heat insulating material 22, and a door drawing mechanism mounting member 15 are arranged in this order from the outer plate 11 side between the outer plate 11 and the inner plate 12 in the front-rear direction. The remaining area inside the space surrounded by the outer plate 11, the inner plate 12, and the frame body may be a space or may be filled with, for example, a foamed heat insulating body foamed.

The door pull-out mechanism attachment member 15 also has a function of fixing the door to the refrigerator body, is a component that satisfies the function of supporting the weight of the door, and is fixed to the inner plate 12.

FIG. 3 is a side sectional view of the freezer compartment door 5a. The upper frame 13 is provided with a recess 13a as a handle for holding a hand when opening and closing the door 5a. The recess 13a is installed on the front side of the door 5a so that the refrigerator user can easily access it. Therefore, the heat insulating property behind the recess 13a becomes low, and therefore the rear plate 12 has the projection 12a at the rear projection of the recess 13a. This reduces the reduction width of the heat insulation of the recess 13a.

FIG. 4 is a diagram showing, as a reference, isotherms around the recess 13a, which are obtained by simulation assuming that the inside of the door other than the vacuum heat insulating material 21 is a urethane foam heat insulating material. The heat flow is in the direction perpendicular to the isotherm, and the heat flows from the recess 13a to the back side inside the component. In this way, the temperature on the back side of the bottom of the recess 13a, which becomes thin, becomes the lowest, and there is a concern that dew condensation may occur. On the other hand, the vicinity of the front plate 11 is relatively hot because it is warmed by the outside air.

For example, when the inside temperature of the freezer is set to -18°C and the outside air is set to 30°C, the minimum temperature of the recess 13a is 28.1°C. In the outside air of 30° C., the relative humidity is about 90% and the temperature is the temperature at which dew condensation occurs.

FIG. 5 is an enlarged cross-sectional view around the recess 13a of this embodiment. The door 5a has a recess 13a on one of the frames on the outer plate 11 side in the front-rear direction. In this embodiment, since the recess 13a is provided in the upper frame body 13, the depth direction of the recess 13a is downward, but the recess 13a is provided in each of the lower frame body, the left frame body, and the right frame body. In this case, the depth direction of the recess is upward, right, and left.

A door inner space 23 is provided between the outer plate 11 and the inner plate 12 (inside the door 5a) and at a position adjacent to the bottom of the recess 13a in the depth direction. Since the space adjacent to the bottom of the recess 13a is not a solid such as a heat insulating material but a space, solid heat conduction from the inside of the refrigerator can be suppressed.
In the door inner space 23, a good heat conductor such as a metal tape (for example, aluminum tape) 31 that extends to the outer plate 11 and the bottom of the recess 13a is arranged. As a result, heat can be conducted from the outer plate 11 having a temperature higher than that of the recess, and dew condensation on the recess 13a can be suppressed.

The door inner space 23 faces the heat insulating material 21 having the outer plate 11, the bottom side of the recess 13a, and a portion facing the bottom with the door inner space 23 interposed therebetween, and preferably further, the door inner space 23 is interposed therebetween. Faces the heat insulating material 22 having a portion facing the outer plate 11. Accordingly, the door inner space 23 is preferably surrounded by the outer plate 11, the bottom side of the recess 13a, the heat insulating material 21, and the heat insulating material 22 in a substantially rectangular shape in a side view. The heat insulating materials 21 and 22 can be formed heat insulating materials and vacuum heat insulating materials, respectively, and a frame body and a heat insulating material can be arranged at the end portions of the space in the side view (that is, the end portions in the left-right direction).

By enclosing the door inner space 23 with the recess 13a, the outer plate 11, and the heat insulating materials 21 and 22 in a side view, the door inner space 23 has less irregularities, and thus air convection easily occurs. Therefore, even if the bottom of the recess 13a is cooled for some reason, such as cooling due to solid heat conduction through the heat insulating material 22 or the like, the air in the door inner space 23 is heated by the outer plate 11 having a relatively high temperature to cause convection. It is expected that the heat will be generated and the heat supply from the vessel side will be performed early. As a result of the study by the present inventors, the convection becomes large in a space having a width of about 5 mm in the front-rear direction, and the effect of heat diffusion is easily obtained.
In addition, since the interior space 23 of the door reduces the risk of scratching the heat insulating material 11 from the recess 13a, the heat insulating material 11 can be easily used as a vacuum heat insulating material.

When the heat insulating material 22 contacts the upper frame 13, the vacuum heat insulating material may be damaged. For the purpose of preventing this, the elastic member 32 is inserted between the upper frame 13 and the heat insulating material 22. The elastic member 32 is a member that elastically deforms, such as foamed polyurethane or soft tape, but may be omitted if there is no concern about damage to the vacuum heat insulating material.

The heat insulating material 21 is fixed to the outer plate 11 with an adhesive, urethane foam, or double-sided tape. Further, the heat insulating material 22 can be fixed to the frame body 13 in the same manner. A soft tape or another heat insulating material may be interposed between the two heat insulating materials 21 and 22. However, in order to suppress solid heat conduction from the inner plate 12 (inside the refrigerator) side, it is preferable that the inner plate 12 is not in contact with the inner plate 12. This is especially true when the heat insulating materials 21 and 22 are vacuum heat insulating materials. The vacuum heat insulating materials 21 and 22 are a core material made of glass wool and a rectangular plate-like material having a gas barrier property for accommodating the core material, and exhibit a high heat insulating property by making a vacuum state inside. The outer packaging material is a metal heat-deposited plastic film produced by vapor-depositing a metal such as aluminum, or a good heat conductor formed by laminating other plastic film materials in a laminated form in order to have a gas barrier property. Therefore, when the heat insulating door is configured so as to be in contact with the inner plate 12, the heat (cold air) inside the refrigerator conducts heat to the metal vapor-deposited plastic film through the inner plate 12, and the heat insulating effect is increased by the heat bridge phenomenon. Lower.

However, in relation to the outer plate 11 and the upper frame 13, the heat of the outside air is easily transferred to the concave portion 13a, so that they may be brought into contact with each other if there is no risk of damage. Further, the inner plate 12 is provided with a packing insertion portion 12b. Although not shown, a heater is provided at this position to prevent dew condensation on the box side. In this embodiment, the heat insulating material 22 is not arranged between the packing insertion portion 12b and the recess 13a. Thus, when the heat insulating material 22 is a vacuum heat insulating material, the distance from the upper frame 13 can be secured, and therefore the risk of damage can be reduced.

In this embodiment, the concave portion 13a is a portion where the user holds his hand, but it may be a region into which a substrate or the like is inserted as long as it is thin.

Further, as shown in FIGS. 6 and 7, the heat insulating material 22 may be extended to the rear of the heat insulating material 21. In this case, the heat insulating material 22 can be fixed easily by using the back surface of the heat insulating material 21. Further, as shown in FIG. 8, the length L1 and the thickness T1 of the vacuum heat insulating material 21, the length L2 and the thickness T2 of the heat insulating material 22 can be variously adjusted.

1 Refrigerator body (insulated box)
2 Refrigerating room 3 Ice making room 3a Ice making room door 4 Upper freezing room 4a Upper freezing room door 5 Lower freezing room 5a Lower freezing room door 6 Vegetable room 6a Vegetable room door 11 Outer plate 12 Inner plate 12a Inner plate convex part 12b Packing insertion part 13 Upper Frame 13a Recess 14 Lower Frame 15 Door Drawer Mechanism Attachment 21 First Insulation Material 22 Second Insulation Material 23 Door Inner Space 31 Metal Tape (Metal Member)
32 Elastic member

Claims (5)

A heat insulating door having an outer plate and a heat insulating material,
A frame body that is arranged on the side periphery of the outer plate and has a recess,
A door inner space disposed adjacent to the bottom of the recess in the depth direction and capable of exchanging heat with the outside air via the outer plate;
The heat insulating material is
A first heat insulating material facing the recess in the depth direction across the door inner space;
A heat insulating door having a second heat insulating material facing the outer plate across the door inner space. The heat insulating door according to claim 1, wherein the first heat insulating material and the second heat insulating material are vacuum heat insulating materials. The heat insulating door according to claim 1 or 2, further comprising a metal member that connects the back side of the outer plate and the bottom side of the recess. The space inside the door is
A space that is adjacent to the recess, the outer plate, the first heat insulating material, and the second heat insulating material and has a substantially rectangular shape in a side view,
The heat insulating door according to claim 1, wherein a width between the outer plate and the second heat insulating material is 5 mm or more. A refrigerator having the heat insulating door according to claim 1.

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