JPH087003B2 - Insulation box for refrigerator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method of disposing a refrigerant condensing pipe for preventing dew condensation in a refrigerator, and in particular, an outer peripheral flange of an inner box formed by vacuum forming or the like. The present invention relates to a heat insulating box for a refrigerator, which is suitable for ensuring adhesion between a refrigerant condensing pipe arranged on a surface and an outer plate flange surface which is a surface to be heat-conducted.

[Conventional technology]

In a conventional refrigerator heat-insulating box, a method of arranging a refrigerant condensing pipe for the purpose of preventing dew condensation is described in JP-B-59-38704. The outer peripheral flange portion of the inner box is fitted into the substantially R-shaped engaging groove of the outer box front flange after being clamped at the peripheral end portion of the outer box via a locking tool.

[Problems to be solved by the invention]

The above-mentioned prior art is the front flange of the outer box 2 in which the refrigerant condensing pipe 3 for preventing dew condensation and the door gasket 6a arranged on the side of the door 6 are in contact with each other, as in the conventional example shown in FIG. 5 and FIG. Face 2a
No consideration is given to reliable contact, and the refrigerant condensing tube 3 made of a particularly good heat-conducting copper tube or steel tube is poor in flexibility, and the entire circumference of the refrigerant condensing tube mounting portion is covered. To contact the outer casing front flange surface 2a evenly,
Was difficult. In addition, since the bending corner portion of the refrigerant condensing pipe 3 is bent on the bending R side and the other side is expanded by that amount, it is difficult to uniformly contact the outer casing front flange surface. For this reason, it is difficult to conduct heat from the refrigerant condensing tube 3 to the outer casing front flange surface 2a only by locking the refrigerant condensing tube 3 with the locking tool 7. After stopping, it was necessary to cover the portion with the aluminum adhesive tape 8 having good heat conductivity, and there was a problem that many attachment parts and attachment man-hours were required.

The object of the present invention is to reliably transfer the heat of the dew condensation-preventing refrigerant condensing pipe arranged around the front opening of the refrigerator box to the front flange surface of the outer box with which the door gasket is in contact. Refrigerant condensing pipe for preventing dew condensation is made possible by making the inner groove shape of the concave groove formed in the outer peripheral flange plate of the inner box made of the vacuum-formed plate product correspond to the deformation amount of the pipe due to the bending process of the refrigerant condensing pipe. The object is to evenly contact the front flange surface of the outer box at a predetermined position to ensure uniform heat transfer from the refrigerant condensing pipe to the front flange surface of the outer box.

[Means for solving problems]

The above-mentioned purpose is to make the inner groove depth of the inner groove formed in the outer peripheral flange portion of the inner box formed by the vacuum forming process of the synthetic resin plate into the inner box forming pressing jig. The pressing piece for forming the lower bottom surface of the groove is achieved by forming only the lower corner bottom surface of the refrigerant condensing tube on which the bent corner portion is arranged during vacuum forming of the inner box.

Even if the bent corner portion of the refrigerant condensing pipe bulges in the groove depth direction of the concave groove when the refrigerant condensing pipe made of a pipe is arranged, it should be arranged at the lower bottom of the concave groove as described above. This is achieved by being able to make contact with the front flange surface of the outer box over the entire circumference of the refrigerant condensing pipe.

[Action]

The refrigerant condensation pipe for preventing dew condensation on the front surface of the outer box of the refrigerator and the contact surface of the door gasket of the door body has a larger amount of cold air leaked inside the refrigerator through the door gasket than in other parts. The refrigerant condensing pipe needs to be uniformly attached to the front flange portion of the outer box over the entire circumference. Therefore, in the present invention, in the refrigerant condensing pipe made of a metal pipe such as a copper pipe, the bending corner portion is formed by the bending process to bulge in the groove depth direction of the concave groove, and the entire circumference of the refrigerant condensing pipe is formed. In order to be able to come into contact with the front flange portion of the outer box, the concave groove provided on the front surface of the outer peripheral flange plate of the inner box during vacuum forming of the inner box,
The inner groove depth dimension is made to correspond to the amount of deformation of the bending corner portion of the refrigerant condensing pipe described above, and the inner depth of the concave groove is increased to form a lower bottom surface. The refrigerant condensing pipe can be uniformly contacted with the front flange portion of the outer box over the entire circumference. Also, the back surface of the concave groove is
Since the portion corresponding to the bent corner portion of the refrigerant condensing pipe and the other portions can be formed in the same plane, the refrigerant condensing pipe is inserted and disposed in the recessed groove portion on the inner box side, and then the portion is inserted. Also in the foaming work of fitting and assembling into the substantially R-shaped engagement groove of the front box flange portion of the outer box and injecting and filling a foamed heat insulating material such as hard polyurethane foam between the inner box and the outer box, the back surface of the recessed groove Since it is molded as the same surface, it can be fitted evenly in the engaging groove arranged on the front flange side of the outer box, so that the leakage of the foamed heat insulating material from the fitting portion at the time of foaming can be surely performed. Can be prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, and 4. FIG. 1 is a front view of a refrigerator embodying the present invention, and FIGS. 2 and 3 are cross-sectional views of essential parts of FIG. Further, FIG. 4 is a cross-sectional view of a main part of the inner box constituting the inside of the heat insulating box for a refrigerator during vacuum forming.

In the figure, a refrigerant condensing pipe 3 for preventing dew near the front flange 2a of an outer box 2 which constitutes the outer side of a refrigerator heat insulating box has an outer peripheral flange surface of an inner box 1 as shown in FIG. An approximately R-shaped engaging groove 2b of the front flange 2a of the outer box 2 which is arranged in the recessed groove 1b (depth is about 5 mm) provided in 1a.
It is fitted and arranged in. Outer flange face 1a of inner box 1
As shown in FIG. 4, the upper recessed groove 1b is provided with a pressing piece 5b for forming the lower bottom surface 1c of the recessed groove 1b, which is installed in a part of the molding holding jig 5a during vacuum forming of the inner box 1 so as to cool the refrigerant. The portion corresponding to the bent corner portion 3a of the condenser tube 3 is formed so as to have the lowered bottom surface 1c. As described above, the lower surface 1c of the recessed groove 1b is formed to have a depth of about 6 mm as the lowered bottom surface 1c of only the inner groove depth of the recessed groove 1b by the pressing piece 5b of the pressing jig 5a for molding. The outer bottom surface of the concave groove 1b is formed as the same surface. Reference numeral 5 is a mold for molding the inner box 1. According to this embodiment, even if the bent corner portion 3a of the refrigerant condensing pipe 3 swells in the groove depth direction from the straight portion, as described above, the inner box 1
Since the necessary portion of the concave groove 1b on the side is formed as the lower bottom surface 1c, the bending corner portion 3a of the refrigerant condensing pipe 3 is evenly brought into contact with the front flange portion 2a of the outer box 2 like the straight portion. be able to. On the other hand, since the outer bottom surface of the concave groove 1b is the same surface, a foamed heat insulating material such as a hard urethane foam that fits evenly into the engaging groove 2b of the outer box front flange 2a and is filled between the inner box 1 and the outer box 2 Even if the material 4 is injected and foamed, it is possible to prevent the foamed heat insulating material 4 from leaking at the fitting portion. By doing so, the amount of cold air leaked inside the refrigerator is arranged over the entire circumference of the outer box front flange portion of the mounting surface of the door gasket 6a, which is relatively large, to prevent dew condensation.
The purpose of the refrigerant condensing tube can be achieved.

〔The invention's effect〕

According to the present invention, the inner groove vacuum forming of the inner box, the groove inner depth of the concave groove for disposing the refrigerant condensing tube on the outer peripheral flange surface of the inner box, as a shape according to the amount of change in the groove depth direction of the refrigerant condensing tube. Since it is only formed during processing and does not require a component for fixing the refrigerant condensing pipe or a component for increasing heat conduction, an inexpensive method for preventing dew condensation on the front flange of the refrigerator outer box is obtained, which is economical. It has a great effect. In addition, the refrigerant condensing pipe has a structure in which the refrigerant condensing pipe is arranged in the concave groove of the outer peripheral flange of the inner box. Since it was a method of forming with one piece, if necessary,
The refrigerant condensing pipe can be accurately arranged, and there is an effect of reducing variations in performance such as the dew prevention performance of the refrigerator.

[Brief description of drawings]

1 is a front view of a heat insulating box for a refrigerator according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view taken along the line BB of FIG. 1, and FIG. 1 is a sectional view of a main part of the inner box of FIG. 1 during vacuum forming, FIG. 5 is a front view of a conventional heat insulating box for a refrigerator, and FIG. 6 is a sectional view taken along line CC of FIG. DESCRIPTION OF SYMBOLS 1 ... Inner box, 1a ... Outer peripheral flange, 1b ... Recessed groove, 1c ... Lower bottom surface, 2 ... Outer box, 2a ... Front flange, 2b ... Engaging groove, 3 ... Refrigerant condensing pipe, 3a ... Bending corner section, 4 ... Foam heat insulating material, 5 ... Mold for molding, 5a ... Holding jig for molding, 5b ... Push piece, 6 ... Door,
6a ... Door gasket, 7 ... Locking tool, 8 ... Aluminum adhesive tape.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Sakae Fukuchi, Inventor Satoshi 800, Ohira-cho, Shimotsuga-gun, Tochigi Hitachi Co., Ltd. Tochigi factory (72) Inventor, Kunisei Araki 800, Tomita, Ohira-machi, Shimotsuga-gun, Tochigi Hitachi Co., Ltd. Inside the Tochigi Plant (72) Inventor Kenkichi Sugi 800 Ota, Ohira-cho, Shimotsuga-gun, Tochigi Inside the Tochigi Plant, Hitachi, Ltd. (56) References: 59-84391 (JP, U) , Y2)

Claims (1)

[Claims] 1. A refrigerant condensing pipe is provided in a recessed groove provided on an outer peripheral flange surface of a peripheral edge of an inner box having an opening on the front surface, and the outer peripheral flange surface portion of the inner box is formed into a substantially R-shaped engaging groove portion on the front surface of the outer box. In the heat-insulating box body for a refrigerator manufactured by injecting and filling the foamed heat-insulating material between the inner box and the outer box, the inner groove depth of the recessed groove arranged on the outer peripheral flange surface of the inner box is adjusted. A heat insulation box for a refrigerator, characterized in that only a portion of the refrigerant condensing tube where the bent corner portion is arranged has a lower bottom surface which is deeper than the others.