JPH0356875Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an insulating box for use in refrigerators, storage cases, etc., in which a part of the condenser is disposed within the main body.

Conventional structure and its problems In Japanese Patent Application No. 77435/1987, the applicant of the present invention previously proposed a method for attaching a condenser to a heat insulating box, in which grooves are formed in the outer box forming the heat insulating box. , it has been shown that a condensing pipe formed flat is inserted into this groove and then expanded to attach a condenser. Since the concave groove formed in this outer box is continuous and bent at least in a substantially U-shape, the condensing pipe formed flat is not a straight pipe but a bent pipe that follows the concave groove. There is. Since this bent part is bent at approximately 90 degrees, it is necessary to leave the tube as a round tube before forming it into a flat shape, and then bend it 90 degrees before flattening it.
This state is explained using Figs. 7 and 8.
Comparing the cross-sectional shape of the bent part a formed around the center point O with the cross-sectional shape of the straight part b, the shape of the bent part a is in the shape of a figure 8 with a recess c formed near the center of the pipe. This forms a resistance portion with a narrowed interior. The reason for this is that when bending 90 degrees, the part that is work hardened is further hammered up and down to make it flat, so the short piece d, which presses the top and bottom points of the round tube first, is less likely to deform than the long piece e. This is because, as a result, force is applied to the periphery of the portion of the long piece e that becomes the recess c. Therefore, the flow of the refrigerant is obstructed by this resistance portion, resulting in an insufficient amount of refrigerant circulation, resulting in a disadvantage that the cooling performance is degraded.

Purpose of the invention Therefore, an object of the present invention is to provide a heat insulating box in which a condensing pipe that does not create resistance to the flow of refrigerant is provided at the bent portion.

Structure of the invention In order to achieve this purpose, the invention includes an outer box,
An inner box, a foamed heat insulating material filled between the two boxes, a groove formed around the edge of the outer box, and a condensing pipe configured of a bent part and a straight part to be disposed in the groove. In this condensation pipe, the corner part of the groove is a bent part with a circular cross-sectional shape, the straight part is a flat part, and the transition part from the circular part to the flat part is a part between the bent part and the flat part. The end of the straight part and the end of the bent part are connected to each other by a stepped part formed by a gently sloped surface on the opposite side.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. 1 is an insulated box for a refrigerator, which includes an outer box 2 made of steel plate, an inner box 3 made of synthetic resin, both boxes 2,
It consists of a foamed heat insulating material 4 filled between 3 and 3 spaces. The inside of the heat insulating box 1 is formed with a freezer compartment 5 in the upper part and a refrigerating compartment 6 in the lower part, and a partition wall 7 is provided between the two compartments 5 and 6 to partition the two compartments 5 and 6. 8 is a groove formed on the front opening edge and the rear opening edge of the outer box 2;
A condensing pipe 9 is disposed within this groove 8.
This condensing pipe 9 is obtained by inserting a flattened pipe in advance into the groove 8, and engaging the flange 3a of the inner box 3 and the back plate 15 with the groove 8 of the outer box 2, thereby forming the foam insulation. After filling material 4, expand the pipe,
It is brought into close contact with the wall of the groove 8. 10 is a 90° bent portion of the condensing pipe a, and this bent portion 10 remains a round pipe. Further, in the portion of the bent portion 10 that transitions from the round tube to the flat portion 11, the bent portion 10 and the flat portion 11 are the same portion 12.
have. The flat portion 11 is pressed flatly using this same portion 12 as a reference surface. Further, the same portion 12 of the portion transitioning from the bent portion 10 to the flat portion 11 and the stepped portion 13 on the opposite side are continuously formed in a shape having a gentle slope. Furthermore,
The stepped portion 13 and the end of the round tube 10 are formed on the straight side of the line intersecting the center O of the radius of the bent portion 10 (shown in FIG. 6). 14 is a thermally conductive sealer, which is poured onto the foamed heat insulating material 4 side of the mating portion between the outer box 2 and the back plate 15. Further, the groove 8 is located at the bent portion 10 and excludes the wall on the side facing the same portion 12 .

In the above configuration, the bent portion 10 of the condensing pipe 9
The step portion 13 leading to the flat portion 11 remains as a round tube.
The end portion of is not formed on the bent portion 10. Furthermore, by providing the same portion 12 in contact with the outer box 2, one surface of the condensing pipe 9 can surely contact the outer box 2, and the flat part 11 can also be kept in the same plane as the groove 8. It can be inserted in any condition. Moreover, since the stepped portion 13 is continuously formed with a gently sloped shape, no arch-like deformation remains after the tube is expanded.

Moreover, since the end of the stepped portion 13 is formed on the straight side of the line that intersects with the center O of the radius of the bent portion 10, the work-hardened portion of the 90° bent portion can be further flattened. Since there is no recess near the center of the 90° bent pipe, the cross-sectional shape of the pipe is shaped like a figure eight.

Therefore, there is no deformation that would cause resistance to the flow of the refrigerant, ensuring sufficient refrigerant circulation and no deterioration in cooling performance.Moreover, since the flat part reliably contacts the concave groove, reliable heat dissipation hardening is achieved. Obtainable.

Hardening of the idea As is clear from the above explanation, the outer box, the inner box, the foam insulation material filled between the two boxes, the groove formed around the edge of the outer box, and the groove formed in the groove. The condensing pipe is composed of a bent part and a straight part so as to be arranged, and the condensing pipe has a corner part of the groove as a bent part having a circular cross-section, and a straight part as a flat part, The transition part from the circular part to the flat part is made to contact the inner surface of the outer box between the bent part and the flat part, and the opposite side is made to contact the end of the straight part and the end of the bent part. Since the condensing pipe is made up of a continuous step with a gently sloped surface, the flat part can be inserted into the concave groove while keeping the same part. It is possible to securely obtain contact with the heat sink and to exhibit a sufficient heat dissipation effect.

In addition, since the bent part is still a round tube, stress corrosion will not occur, and the end of the stepped part leading to the flat part is formed on the straight side of the line that intersects with the center of the radius of the bent part. Since the part that has been work hardened due to bending is not further flattened, the bent part cannot be deformed to resist the flow of the refrigerant, and the step part has a shape with a gentle slope. Therefore, even when the flat part is expanded, there is no local deformation, so deformation that causes resistance to the refrigerant is not possible, and sufficient refrigerant circulation can be ensured, ensuring cooling performance. Since it reliably contacts the groove, a reliable heat dissipation effect can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a heat insulating box showing an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1,
Figure 3 is a sectional view taken along line B-B in Figure 1;
The figure is an enlarged diffusion view of part C in Fig. 1, Fig. 5 is a view of the condensing pipe in Fig. 4 in the direction of arrow D, Fig. 6 is a view in the direction of E in Fig. 4, and Fig. 7 is a bent section of the conventional example. FIG. 8 is a cross section taken along line FF in FIG. 7. 1...Insulation box, 2...Outer box, 3...Inner box, 4...
...Foam insulation material, 8...Concave groove, 9...Condensation pipe,
10...Bent part, 11...Flat part, 12... Same part, 13... Stepped part.

Claims (1)

[Scope of utility model registration request] It consists of an outer box, an inner box, a foam insulation material filled between the two boxes, a groove formed around the edge of the outer box, and a bent part and a straight part arranged in the groove. This condensation pipe has a corner portion of the groove as a bent portion with a circular cross-sectional shape, a straight portion as a flat portion, and a transition portion from the circular portion to the flat portion as a bent portion. The flat part is in contact with the inner surface of the outer box, and the opposite side is a heat insulating part in which the end of the straight part and the end of the bent part are connected by a stepped part formed by a gently sloped surface. box.