JPS6238635B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a type of refrigerator in which the outer box of the refrigerator itself is partially used as a heat sink for the condenser, thereby reducing the size of the condenser and preventing sweating.

Conventionally, in such refrigerators, the condenser pipe was simply inserted into a concave groove or held down by a concave holding plate, and the contact with the outer box was only in a line contact, resulting in poor heat dissipation and not achieving the desired performance. There was a flaw that was difficult to overcome.

In order to avoid this drawback, for example, the cross section of the condenser pipe was changed from circular to flat.
This is shown in Publication No. 63272, etc., but in order to increase the contact area between the pipe and the groove, when inserting the pipe into the groove, it is necessary to insert it into the press-fitting area. Twisting a pipe that has been pre-bent into a substantially U-shape or quadrilateral shape to prevent local bending, etc., requires great care and skill, which poses a problem of poor productivity. In addition, in order to facilitate insertion into the groove and increase the adhesion of the pipe, a flat pipe is inserted into the groove,
The same applicant has filed Utility Application No. 51-125083 (Utility Model Application No. 53-42274) which applies external pressure to the pipe to deform the pipe to follow the shape of the groove, thereby measuring the close contact between the pipe and the groove.
This method uses external pressure such as a press to deform the pipe, so it is convenient if the pipe is exposed to the outside of the refrigerator, but if it is not, for example, it can be placed on the insulation side. It cannot be carried out if Furthermore, it was not possible to prevent the groove from deforming as the pipe deformed, and there was a limit to the improvement in the degree of adhesion between the two.

In view of the above-mentioned points, the present invention applies fluid pressure such as water or air to the inside of the pipe, expands the pipe using the internal pressure of the pipe, and makes it possible to expand even a pipe placed in a heat insulating material. The purpose is to reduce the deformation of the grooves by utilizing the rigidity of the foam insulation material, improve the degree of contact between the two, and ultimately improve cooling performance.

An embodiment of the present invention will be described below with reference to the drawings. 1 is the refrigerator body, with U forming the top and sides.
An outer box 5 is formed of an outer panel 2 bent into a shape, a back panel 3, and a bottom panel 4, an inner box 6 is made of synthetic resin, and the space between the outer box 5 and the inner box 6 is filled with foam. It consists of a heat insulating material 7. 2a is a groove formed by bending the periphery of the front opening of the outer box 5, and the high temperature refrigerant pipe 8 and the inner box 6 are inserted into this groove 2a. An end portion 5a of the outer box 5 is positioned between the two boxes 5 and 6. 9 is a form for sealing the heat insulating material 7. The high-temperature refrigerant pipe 8 is inserted into the groove 2a before inserting the inner box 6, and is previously deformed into an irregular shape such as an ellipse. After inserting the inner box 6 and filling and hardening the heat insulating material 7, the pipe 8 is expanded as shown in FIG. 3 using fluid pressure such as air or water pressure, and is deformed along the plane of the groove 2a. It is something.

In addition, in the above embodiment, the diameter of the pipe 8 is
The molding process was carried out using a round copper tube of 5.5 mm and 0.4 mm thickness. That is, by forming a copper tube in advance into an elliptical shape with a minor axis of 3.8 mm and a major axis of 6.5 mm, placing it in the groove 2a, filling it with the heat insulating material 7 and hardening it, a fluid pressure of about 70 kg/cm ² is applied. The tube was expanded. It was also found that when the thickness of the copper tube was 0.6 mm, sufficient expansion could be obtained by applying a fluid pressure of approximately 100 Kg/cm ² .

FIG. 5, which corresponds to FIG. 3, and FIG. 6 show other embodiments, and in FIG.
The end portion 5a of the outer box 5 is located between the two boxes 5 and 6'. Also the 6th
In the figure, the rising piece 5 provided on the outer box 5 and the inner box 6''
A recessed groove 2c is formed at the stepped portion 6 provided in the groove 2c.
Further, at this time, the end 5a of the outer box 5 and the end 6a of the inner box 6 are positioned between the two boxes 5 and 6. In either case, the high temperature refrigerant pipe 8 is connected to the grooves 2b, 2c.
After insertion, the tube is expanded. Also, insulation material 7
By expanding the pipe after foam hardening, the concave groove 2
The rigidity of the heat insulating material 7 is used to reduce the elastic deformation of the end portion 5a and the stepped portion 6 of the outer box 5 constituting the outer box 5 toward the space to be filled with the heat insulating material 7, thereby achieving a predetermined surface contact. can get.

Incidentally, FIG. 4 shows a cooling unit installed in the refrigerator main body 1. As shown in FIG. As is well known, the cooling unit includes a hermetic compressor 10, a condenser 11, a high-temperature refrigerant pipe 8, a capillary tube 12, and an evaporator 13 connected in an annular manner.

As described above, the present invention arranges a high temperature refrigerant pipe deformed into an irregular shape in the groove formed in the outer box or the inner box, or in the groove formed by the outer box and the inner box, and between the two boxes. After filling and hardening the heat insulating material with foam, a high-pressure fluid such as air or water is introduced into the pipe, and the pipe is expanded by the pressure of this fluid, thereby deforming the pipe along the surface of the groove, and connecting the pipe and the outer box. The heat dissipation effect is improved by increasing the contact between Even if the pressure is low, a predetermined surface contact can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a refrigerator showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view taken along line -' in Fig. 1 before pipe expansion, and Fig. 3 is an enlarged view of Fig. 2 after pipe expansion. 4 is a refrigerant circuit diagram of a cooling unit installed in the refrigerator, and FIGS. 5 and 6 are sectional views of other embodiments corresponding to FIG. 2. 2a, 2b, 2c...concave groove, 5...outer box, 6...
...Inner box, 7...Insulation material.

Claims (1)

[Claims] 1. An inner box is placed inside the outer box, and a groove is formed in the outer box or the inner box, or between the outer box and the inner box, and
A high-temperature refrigerant pipe of an irregular shape is placed in this groove, and after foaming and hardening a heat insulating material between the two boxes, a high-pressure fluid such as air or water is passed through the refrigerant pipe to expand the refrigerant pipe. A method of manufacturing an insulated refrigerator box.