JPH06147740A - Door structure for refrigerator - Google Patents

Abstract

PURPOSE:To provide a door for a refrigerator, whose profile member is constituted of the integrated molded form of plastic blow forming to reduce the number of parts of the door for refrigerator, simplify the manufacturing processes of the same and improve the strength of the same. CONSTITUTION:The door of a refrigerator is constituted of a profile member 6, integrated by the blow molding of plastic and whose space is filled with vacuum insulating material 8 and urethane foam 4, which are filled through a urethane foam pouring port 7, while the urethane foam pouring port 7 is sealed by a cap 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator door structure,
In particular, the present invention relates to a refrigerator door structure in which an outer material including a door opening / closing handle is integrally formed of a plastic material.

[0002]

2. Description of the Related Art A conventional refrigerator door structure will be described with reference to FIG. 1. Reference numeral 1 is a door outer plate, 2 is an upper cap having a handle for opening and closing the door, and 3 is a lower cap. It is fixed by etc. Reference numeral 4 is a urethane foam, which is foam-filled by using a foam worker before attaching the door inner plate 5.

The door of the refrigerator having the above-described well-known structure has a large number of parts, which complicates the assembly process and the manufacturing process such as the prevention of leakage of urethane foam, and is economically disadvantageous. Furthermore, since plastic is used for the cap and an iron plate is used for the outer plate, there is a drawback that the plastic cap is easily cracked due to the difference in coefficient of thermal expansion between the plastic and the iron plate especially at low temperatures. Further, in recent years, the treatment of waste in a refrigerator has become a problem, but since the entire door is adhered with a rigid urethane foam, it has a drawback that it is difficult to disassemble and cannot be reused.

[0004] For example, Japanese Patent Application Laid-Open No. 3-274375 can be cited as one related to this type of refrigerator door structure.

[0005]

In order to reduce the number of parts in the refrigerator door structure, simplify the assembly process, and omit the combination of the plastic material and the iron plate, the door outer material is integrally molded with the plastic material, It achieves that purpose.

[0006]

In order to achieve the above object, the entire door outer material of a refrigerator is integrally molded by blow molding, and a urethane foam alone is injected as a heat insulating material into its inner hollow portion, a vacuum heat insulating material. This is a refrigerator door structure that is embedded alone or filled with a combination of urethane foam and a vacuum heat insulating material. In addition, in order to improve the appearance of the outer surface of the door, only the outer surface material is manufactured by gas injection molding to improve the sink marks and warpage of the outer surface. Furthermore, for easy disposal, a resin that does not adhere to the urethane foam or a release agent is treated on the surface that adheres to the urethane foam to improve the dismantling property at the time of discarding the door.

[0007]

The blow molding method is conventionally suitable for manufacturing plastic hollow products such as polyethylene tanks, and shape molding having a hollow portion for filling a heat insulating material therein such as a refrigerator door structure can be integrally molded. Therefore, according to the door structure of the first aspect, since the outer surface material is integrally molded, the number of parts is reduced, and the manufacturing process at the time of combination can be simplified, which brings an economic effect. Further, according to the door structure of the second aspect, pre-pressurizing the gas has an effect of suppressing the strain on the surface of the outer surface material at a low temperature, so that the external appearance quality of the integrally molded outer surface material can be improved.

[0008]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 2 is a vertical cross-sectional view of a door of a refrigerator equipped with the present invention. The external material 6 is integrally molded by a blow molding method of a plastic material and has a hollow portion. The space is filled with the urethane foam 4 after inserting the vacuum heat insulating material 8 from the urethane foam inlet 7, and the inlet 7 is sealed by the cap 9. In this way, in the present invention, the door of the refrigerator is integrally formed to reduce the number of parts, simplify the manufacturing process and prevent the leakage of urethane foam, and reduce the coefficient of thermal expansion by the combination of the plastic and the iron plate as in the conventional case. It is possible to prevent the handle from cracking due to the difference. Although the heat insulating material filled in the space is a combination of the vacuum heat insulating material and the urethane foam, the same effect can be obtained by using each independently.

FIG. 3 is a vertical cross-sectional view of a refrigerator door in which the outer surface material of the refrigerator door is integrally formed and a gas space portion is provided in the plate thickness, and the outer surface material 10 is formed by gas injection injection molding of a plastic material. A gas space portion 11 is provided inside the plate thickness and integrally molded. After the vacuum heat insulating material 8 is installed on the inner surface, the inner surface material 12 is fixed by foaming, filled with urethane foam 4, and molded with plastic to complete the inner surface material 12.

According to the present invention, by providing the gas space portion in the plate thickness portion of the outer surface material of the door, it is possible to prevent sink marks on the outer surface of the molded product and warp of the entire molded product, so that the door appearance can be finished nicely and the volume of the space portion can be improved. The resource saving effect of the plastic material equivalent to is obtained.

FIG. 4 is a vertical cross-sectional view of a refrigerator door in which the exterior material of the refrigerator door is integrally molded by blow molding, and a release agent is applied to the adhesive surface of the urethane foam.
Has a hollow portion integrally formed by blow molding of a plastic material. A mold release agent 12 such as a metal soap is applied to the inner surface of the hollow portion, and a vacuum heat insulating material 8 is inserted into the space portion from the urethane foam inlet 7 and then the urethane foam 4 is filled, and the inlet 7 is capped. Sealed by 9. In this way, according to the present invention, since the release agent is applied to the urethane adhesive surface, the plastic material of the outer material and the urethane foam can be easily and cleanly separated when the door is dismantled, and the plastic material can be recycled. Therefore, the effect of minimizing the amount of industrial waste can be obtained. The same effect can be obtained without using a release agent if the plastic material of the outer shape material 6 is a material having no adhesiveness with a hard urethane foam such as polypropylene resin.

[0013]

According to the present invention, it is possible to simultaneously improve the strength of the refrigerator door, reduce the number of parts, simplify the assembly process, and easily dispose of the refrigerator door.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a conventional refrigerator door.

FIG. 2 is a vertical cross-sectional view of a refrigerator door equipped with the present invention.

FIG. 3 is a vertical cross-sectional view of a refrigerator door in which an outer surface material of the refrigerator door is integrally formed and a gas space portion is provided within the plate thickness.

FIG. 4 is a vertical cross-sectional view of a refrigerator door in which an outer shape material of a refrigerator door is integrally molded by blow molding, and a release agent is applied to an adhesive surface of the urethane foam.

[Explanation of symbols]

1 ... Door outer plate, 2 ... Upper cap with handle for opening / closing the door, 3
… Lower cap, 4… Urethane foam, 5… Door inner plate, 6
... Outer material, 7 ... Urethane inlet, 8 ... Vacuum heat insulating material, 9 ...
Cap, 10 ... Outer surface material, 11 ... Gas space part, 12 ... Release agent.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsumi Fukuda 800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Stock company Hitachi Co., Ltd. Tochigi Plant (72) Inventor Noriaki Seshita 800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi (72) Inventor Masahide Aoki 1-280, Higashi Koigakubo, Kokubunji City, Tokyo Stock Company Hitachi Design Co., Ltd.

Claims (3)

[Claims] 1. In a heat-insulating door for a refrigerator, an outer material including a handle for opening and closing the door is integrally formed of a plastic material, and a hard urethane foam, a vacuum heat insulating material alone or a combination thereof is injected and incorporated into the internal space portion. The door structure of the refrigerator characterized in that. 2. An outer surface material including a door opening / closing handle of a heat insulating door of a refrigerator and its surrounding side plate are integrally molded, and an outer surface material having a gas space portion in its thickness and a plastic molded inner surface material. Refrigerator door structure characterized by being combined. 3. The door according to claim 1 or 2, wherein the surface of the outer surface of the door that contacts the hard urethane foam is made of a plastic material that is not adhesive to the hard urethane foam, or if the plastic material is adhesive, the hard material The refrigerator door structure is characterized by the release agent treatment on the adhesive surface with the urethane foam.