JP4417335B2 - Freezer refrigerator - Google Patents

Description

  The present invention relates to a refrigerator-freezer, and more particularly to a heat-insulating structure in a front opening of a heat-insulating box of a refrigerator-freezer.

  The conventional refrigerant pipe fixing device of the refrigerator communicates with a small hole between the heat insulating material injection space between the outer box and the inner box of the refrigerator and the engagement groove formed at the front edge of the outer box. In some cases, a foaming liquid is injected into the engaging groove and cured to form a refrigerant tube support member (see, for example, Patent Document 1).

  In addition, it has an outer box in which a heat insulating band having a concave groove is fitted in an annular groove formed on the inner peripheral surface of the opening, and an inner box in which a flange formed on the outer periphery of the opening is inserted into the concave portion of the heat insulating band. There is a heat insulation box of a refrigerator (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 58-020886 (first page, FIG. 3) Japanese Utility Model Publication No. 54-008163 (first page, FIG. 2)

  In refrigerators and refrigerators, the cooler absorbs the amount of heat in the cabinet and cools it. Therefore, if the amount of heat enters the cabinet from outside the cabinet, the temperature inside the cabinet rises, and the cooler must absorb more heat. No longer. In this way, the amount of heat entering from the outside to the inside of the chamber is called heat loss. If the heat loss is reduced, the amount of heat absorbed by the cooler is reduced, the operating load of the compressor is reduced, and energy is saved.

In the conventional refrigerant pipe fixing device for a refrigerator according to Patent Document 1, the outer box is formed of a metal plate that can adsorb a magnet provided inside the door packing, so that heat conduction is good, and the front opening is Because it is shaped to face the interior, the edge of the inner box is supported by a support member, but this alone is not sufficient to prevent heat loss, and it is transmitted through the joint between the outer box and the inner box There was a heat loss that entered the cabinet from outside. In addition, if the heat release pipe for preventing dew condensation provided in the insertion part of the outer box and the inner box insertion part are close to each other, the heat from the heat release pipe is transmitted through the inner box and enters the cabinet. There was a case.
Moreover, although the conventional heat insulation box concerning patent document 2 insulates an inner box and an outer box, it does not make an electric heater a structural requirement.

  This invention was made in order to solve the above problems, and it aims at providing the refrigerator-freezer which can reduce the calorie | heat amount which enters into a warehouse from the front opening part of the heat insulation box provided with the heat radiating pipe. To do.

A refrigerator-freezer according to the present invention includes a refrigerator main body having a heat insulating box body including an outer box and an inner box and having a front surface opened, and a door attached to the front surface of the refrigerator main body so as to be openable and closable. The outer box is provided with a substantially U-shaped outer box insertion part that is bent in its front edge and opened to the inside, and an opening edge is formed on the front side, and the inner box of the heat insulation box has its front edge An inner box insertion portion that is bent into the outer box insertion portion side and inserted into the outer box insertion portion, a heat radiating pipe is provided in the outer box attachment portion, and a part of the inner box insertion portion Is bent in a substantially U shape along the heat radiating pipe, the height of the bent portion is made larger than the opening of the outer box insertion portion, and the inner box insertion portion pushes the outer box insertion portion wide. It is possible to insert, the concave side of the bent portion of the inner box insertion portion and the front opening edge of the outer insertion portion The heat radiating pipe is disposed on the front side and the back side of the inner box insertion portion, and at least a surface of the heat radiating pipe side of the inner box insertion portion is provided with a sheet-like heat insulation means. It extends on both sides of the bent portion and contacts the back surface of the front opening edge of the outer box insertion portion, covers the heat radiating pipe with the heat insulating means and the front opening edge, and the heat insulating means inserts the inner box insertion portion. The heat radiation to the front is prevented and heat is released to the front opening edge .

  In the front opening of the heat insulation box body of the refrigerator / freezer, since the sheet-like heat insulating means is provided in the insertion portion of the inner box inserted into the insertion portion of the outer box, the insertion portion of the inner box from the insertion portion of the outer box It is possible to prevent heat loss from entering the inside of the cabinet from outside the warehouse and to prevent heat loss from entering the inside of the cabinet through the insertion portion of the inner box from the heat radiating pipe.

Embodiment 1 FIG.
1 is a perspective view of a refrigerator-freezer according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG.
In the figure, the refrigerator-freezer includes a refrigerator main body 1, a door 20 attached to the refrigerator main body 1 so as to be openable and closable, and drawer-type doors 20a and 20b. The refrigerator main body 1 is provided with a heat insulating box 2, and this heat insulating box 2 is constituted by an outer box 3 made of a steel plate, an inner box 4 made of a synthetic resin, a heat insulating material 5 filled between the two, and the like. A front opening 10 is provided on the front surface of the heat insulation box 2. The front opening edge 31 of the outer box 3 is formed with an insertion portion a having a substantially U-shaped cross-section that narrows and opens toward the front opening 10 side. An insertion part (described later) is fitted.

  The insertion portion a provided on the front opening edge 31 of the outer box 3 is formed by bending the end of the outer box 3 a plurality of times. That is, the end surface of the outer box 3 is bent at a substantially right angle toward the front opening 10 side (the right side in FIG. 3) at the first bent portion (a) to form the suction surface 3a, and then at the second bent portion (B). The first insertion surface 3b is formed by folding back substantially 180 degrees along the suction surface 3a, and then the third bending portion C (located inside the first bending portion A) of the outer box 3 A second insertion surface 3c is formed by bending along the side wall 30 to the depth side of the refrigerator (upper side in FIG. 3), and a fourth bent portion (for example, about 5 to 10 mm from the third bent portion c). In the fourth bending portion d) located at a distance, the third insertion surface 3d is formed by bending the front opening 10 side at an acute angle, and these first, second, and third insertion surfaces 3b, 3c, The insertion part a is formed by the part surrounded by 3d.

  The front opening 10 side of the inner box 4 is bent substantially at right angles to the side wall 30 side (left side in FIG. 3) of the outer box 3 over the entire circumference, and the bent portion is sandwiched between the insertion portions a of the outer box 3, The insertion part 4a to the insertion part a is comprised. And the insertion part 4a of the inner box 4 is formed with a U-shaped bent part 4b that is bent in a substantially inverted U-shaped cross section and protrudes toward the depth side of the refrigerator. The height of the U-shaped bent part 4b Is made larger than the opening width of the insertion portion a of the outer box 3, so that the insertion portion 4a of the inner box 4 is inserted and fixed by pushing the insertion portion a of the outer box 3 wide.

Almost the entire circumference of the front and back of the insertion portion 4a of the inner box 4 is covered with a heat insulating sheet 11 which is a heat insulating means. Since the width of the insertion portion 4a of the inner box 4 is, for example, about 2 cm, a heat insulation sheet 11 having a width of about 2 cm is attached to the front and back of the insertion portion 4a of the inner box 4 one by one, or one piece of heat insulation having a width of about 4 cm. The sheet 11 is pasted from the front to the back of the insertion portion 4a of the inner box 4.
The heat insulating sheet 11 is formed of a glass fiber or the like into a felt shape having a thickness of about 1.5 mm to 3.0 mm, and has a physical property of thermal conductivity of about 0.03 (W / m K). Since the thermal conductivity of the steel plate is about 20 (W / m K) and the thermal conductivity of the synthetic resin is about 0.2 (W / m K), the heat insulating sheet 11 is made of the outer casing 3 of the steel plate or made of synthetic resin. It has better heat insulation than the inner box 4, and has a structure that is attached to the insertion portion 4 a of the inner box 4 by applying an adhesive process to one side of the heat insulating sheet 11.

FIG. 5 is a diagram showing the relationship between the thermal resistance (K / W) per 1 m ² of the heat insulating sheet 11 and the energy saving rate (%). In order to achieve an energy saving rate of 1%, it is necessary to use a heat insulating sheet having a thermal resistance of 0.02 (K / W). While the thermal resistance of the heat insulating sheet is between 0.00 and 0.10 (K / W), the greater the thermal resistance, the more energy saving can be achieved, and the maximum effect of about 2 (%) is obtained. Shows a tendency that the thermal resistance is approximately 0.05 (K / W) and gradually approaches 2 (%), and even if the thermal resistance is increased to 0.10 (K / W) or more, the effect is not improved. The heat resistance of the heat insulating sheet is 0.05 to 0.10 (K / W).

  FIG. 6 is a diagram showing the heat loss distribution of the inner box 4, and the horizontal axis x represents the distance in the depth direction along the inner box 4 from the door packing 21 (described later), and the inner box 4 and the door packing 21. The point of contact 100 is the origin, and as x increases, the inner box 4 advances toward the back of the interior. In the figure, the heat loss increases as it is closer to the joint between the outer box 3 and the inner box 4, but the thermal resistance of the heat insulating sheet 11 is 0.05 (K / W) and 0.10 (K / W). It can be seen that the heat loss curve decreases as the value increases.

  Between the concave side (the lower side in FIG. 3) of the U-shaped bent portion 4 b provided in the insertion portion 4 a of the inner box 4 and the first insertion surface 3 b of the outer box 3, the vertical direction of the refrigerator (FIG. 3). The heat-dissipating pipe 12 for preventing dew condensation is disposed in the front-rear direction, and a heat insulating sheet 11 is interposed between the insertion portion 4a and the heat-radiating pipe 12. This heat radiating pipe 12 releases heat to the front opening edge 31 (first insertion surface 3b, adsorption surface 3a) of the outer box 3 to increase the temperature and prevent dew condensation.

  The door 20 of the refrigerator / freezer is provided with a hollow door packing 21 that comes into contact with the suction surface 3 a of the front opening edge 31 of the outer box 3. A magnet 22 for attracting the attracting surface 3a is provided.

  In the refrigerator refrigerator configured as described above, as shown in FIG. 2, the compressor 40 that compresses the refrigerant, the condenser 41 that condenses the refrigerant, and a part of the condenser 41 are connected to the front opening 10 of the refrigerator body 1. A refrigeration cycle is configured by connecting in series, in this order, a heat-dissipating pipe 12 for preventing dew that has been passed through, a throttle device 42 for decompressing the refrigerant, and a cooler 43 for evaporating the refrigerant.

  As shown in FIG. 4, the refrigerator-freezer configured as described above has an inner box 4 having an insertion portion 4a having a substantially rectangular parallelepiped shape whose back is closed and whose front is open and whose opening side edge is bent at a substantially right angle. Prepare the heat insulating sheet 11 on both sides of the insertion portion 4a, and then embed the heat radiating pipe 12 in the concave side of the U-shaped bent portion 4b of the heat insulating sheet 11, so that the insertion portion 4a is substantially U-shaped. The inner box 4 and the outer box 3 are joined by being inserted into the insertion portion a provided on the front opening edge 31 from below the outer box 3.

Next, the operation of the refrigerator-freezer will be described. Heat directed from the outer box 3 side to the inner box 4 side, that is, from the outside of the box to the inside of the box, is blocked by the heat insulating sheet 11 interposed between the insertion portion a of the outer box 3 and the insertion portion 4a of the inner box 4.
Moreover, the heat radiating pipe 12 provided in the insertion portion a of the outer box 3 releases heat to the front opening edge 31 (first insertion surface 3b, adsorption surface 3a) of the outer box 3 to increase the temperature and cause dew. To prevent. The heat from the heat radiating pipe 12 toward the insertion portion 4a is blocked by the heat insulating sheet 11 interposed between the heat radiating pipe 12 disposed in the insertion portion a of the outer box 3 and the insertion portion 4a of the inner box 4. Thus, it is not transmitted to the insertion portion 4a.

  According to the first embodiment, since the heat insulating sheet 11 is interposed between the insertion portion a of the outer box 3 and the insertion portion 4a of the inner box 4, it is transmitted through the connecting portion of the outer box 3 and the inner box 4. It is possible to reduce the heat loss entering from the outside to the inside. Moreover, since the heat insulation sheet 11 is interposed between the heat radiating pipe 12 and the insertion portion 4a, heat loss transmitted from the heat radiating pipe 12 to the insertion portion 4a is reduced.

Embodiment 2. FIG.
FIG. 7 is a cross-sectional view of a refrigerator-freezer according to Embodiment 2 of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In Embodiment 1, although the case where the front and back of the insertion portion 4a of the inner box 4 were almost entirely covered with the heat insulating sheet 11 was shown, in Embodiment 2, the insertion portion 4a of the inner box 4 is covered. Only the surface on the side where the heat radiating pipe 12 is located is covered with the heat insulating sheet 11. That is, as shown in FIG. 7, for example, a heat insulating sheet 11 having a thickness of 3 mm is attached only to the concave side of the U-shaped bent portion 4 b provided in the insertion portion 4 a of the inner box 4.

Since the temperature of the heat radiating pipe 12 is higher than that of the insertion part a of the outer box 3, the heat loss transmitted to the insertion part 4 a of the inner box 4 is reduced by the insertion part a (third insertion surface 3 d) of the outer box 3. The heat radiation pipe 12 is larger than the heat radiation pipe 12.
According to the second embodiment, since the heat insulating sheet 11 is attached only to the surface of the insertion portion 4a of the inner box 4 where the heat radiating pipe 12 is located, the thickness of the heat insulating sheet 11 can be increased. The heat loss from the heat radiating pipe 12 can be reduced efficiently. Moreover, since the operation | work which sticks the heat insulation sheet 11 to the insertion part 4a only needs to be the surface by which the heat radiating pipe 12 of the insertion part 4a is located, work efficiency is good.

  As described above, the heat insulating sheet 11 covering the concave side of the U-shaped bent portion 4b provided in the insertion portion 4a of the inner box 4 is inserted from the insertion portion a of the outer box 3 into the insertion portion 4a of the inner box 4. Therefore, the heat loss from the heat radiating pipe 12 to the insertion portion 4a of the inner box 4 can be prevented, so that the heat loss entering the interior can be reduced and energy saving can be achieved.

  In the above description, the case where the present invention is implemented in the illustrated refrigerator-freezer is shown. However, the present invention is not limited to this, and the present invention can also be implemented in a refrigerator-freezer having another structure.

It is a perspective view of the refrigerator-freezer which concerns on Embodiment 1 of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is explanatory drawing which shows the assembly method of the refrigerator-freezer which concerns on Embodiment. It is the diagram which showed the relationship between the thermal resistance of the heat insulation sheet which concerns on Embodiment 1, and an energy saving rate. 4 is a diagram showing a heat loss distribution according to Embodiment 1. FIG. It is sectional drawing of the freezer refrigerator which concerns on Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator main body, 3 outer box, 3a adsorption surface, 3b 1st insertion surface, 3c 2nd insertion surface, 3d 3rd insertion surface, 4 inner box, 4a insertion part, 4b U-shaped bending part, 5 heat insulation Material, 11 heat insulation sheet (heat insulation means), 12 heat radiation pipe, a insertion part.

Claims (4)

A refrigerator main body having a heat insulating box made of an outer box and an inner box and having a front surface opened, and a door attached to the front surface of the refrigerator main body so as to be opened and closed.
The outer box of the heat insulation box is provided with a substantially U-shaped outer box insertion part that is bent in front and is opened inward and an opening edge is formed on the front side. Is provided with an inner box insertion portion which is inserted into the outer box insertion portion by bending the front side edge portion to the outer box insertion portion side, and a heat radiating pipe is disposed in the outer box mounting portion,
A part of the inner box insertion portion is bent in a substantially U shape along the heat radiating pipe, and the height of the bent portion is larger than the opening of the outer box insertion portion so that the inner box insertion portion is So that the box insertion part can be expanded and inserted,
The heat radiating pipe is disposed between the concave side of the bent portion of the inner box insertion portion and the front opening edge of the outer insertion portion, and at least on the heat radiating pipe side of the front and back of the inner box insertion portion. Sheet-like heat insulation means is provided on the surface,
The heat insulating means extends along both sides of the bent portion along the inner box insertion portion and contacts the back surface of the front opening edge of the outer box insertion portion, and the heat radiating pipe is connected to the heat insulating means and the front opening edge. And the heat insulation means to prevent heat dissipation to the inner box insertion portion and to release heat to the front opening edge,
A refrigerator-freezer characterized by that. The outer box insertion portion is formed in a substantially U-shape in which the front edge of the outer box is bent toward the opening side of the heat insulating box body, and further bent back and forth one time, and is opened inward in the side surface. The refrigerator-freezer according to claim 1, wherein the refrigerator is a refrigerator.   3. The refrigerator-freezer according to claim 1, wherein the heat insulating means is formed of a felt-like heat insulating sheet.   The refrigerator-freezer according to claim 3, wherein the felt-like heat insulating sheet is formed of glass fiber.

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