JP2011237120A - Refrigerator - Google Patents

Abstract

In a refrigerator in which a vacuum heat insulating material is embedded in urethane, voids are generated in the heat insulating material due to a difference in foaming speed.
In a refrigerator having a rigid urethane foam 4 between an outer box 1 and an inner box 2 and having a vacuum heat insulating material 3 buried in the middle, the space between the rear end of the vacuum heat insulating material 3 and the outer box 1 is closed. The spacer 24a is disposed, or the spacers 24b and 24c for closing the space between the rear end of the vacuum heat insulating material 3 and the inner box 2 are disposed, or both of the spacers are disposed.
[Selection] Figure 2

Description

  The present invention relates to a refrigerator.

  As a conventional technique, Patent Document 1 discloses a configuration in which a vacuum heat insulating material is embedded in a high-quality urethane foam between the outer box and the inner box on the surface where the outer box surface temperature becomes higher than the outside air temperature.

JP 2003-14368 A

  However, in the configuration described in Patent Document 1, since urethane begins to foam from the vicinity of the urethane stock solution falling, the foaming speed is high immediately below the injection nozzle, and the foaming speed is low at a position away from the injection nozzle. In addition, the urethane filled between the vacuum heat insulating material and the outer box and the urethane filled between the vacuum heat insulating material and the inner box may have different foaming rates, which causes voids.

  Then, in view of the said subject, this invention prevents that a void arises in a heat insulating material and aims at providing a refrigerator with high heat insulation performance.

  In order to achieve the above object, the present invention provides an outer box and an inner box forming a refrigerator, a vacuum heat insulating material disposed between the outer box and the inner box, and the outer box and the vacuum heat insulating material. In the refrigerator having a gap and a rigid urethane foam filled in the gap between the inner box and the vacuum heat insulating material, between the rear end portion of the vacuum heat insulating material and the inner box, or after the vacuum heat insulating material A spacer is arranged at least between the end portion and the outer box.

  The spacer may be a polystyrene foam material or a hard urethane foam material.

  Further, the spacer is not arranged in the vicinity of the rigid urethane foam injection hole so as not to hinder the flow in the injection direction of the stock solution of the rigid urethane foam.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that a void arises in a heat insulating material and can provide the refrigerator with high heat insulation performance.

Front sectional drawing of the refrigerator in embodiment of this invention. AA sectional drawing of FIG. The urethane foam figure in the refrigerator horizontal cross section in embodiment of this invention. The urethane foam figure in the refrigerator horizontal cross section in embodiment of this invention. The urethane foam figure in the refrigerator horizontal cross section in embodiment of this invention. The urethane foam figure in the refrigerator horizontal cross section in embodiment of this invention. The urethane foam figure in the refrigerator horizontal cross section in embodiment of this invention.

(Embodiment)
The refrigerator in one Embodiment of this invention is shown in FIG.1 and FIG.2. FIG. 1 shows a front cross-sectional view of the refrigerator, and FIG. 2 shows a cross-section AA of FIG.

  In FIG.1 and FIG.2, 21 is a refrigerator main body. Reference numeral 22 denotes a heat insulating box. The heat insulation box 22 includes a hard urethane foam 4 and a vacuum heat insulating material 3 disposed in a space 23 formed by an inner box 2 made of a synthetic resin such as ABS and an outer box 1 made of a metal such as an iron plate. Yes. In manufacturing the heat insulating box 22, the vacuum heat insulating material 3 is fixed directly or indirectly to the outer box 1 or the inner box 2 in advance, and then the raw material of the rigid urethane foam 4 is injected to perform integral foaming. The urethane stock solution is injected from an injection nozzle 31 inserted into the injection hole 30.

  Furthermore, the heat insulation box 22 is divided into rooms of each temperature zone, and constitutes a refrigerator compartment 15, a freezer compartment 12, and a vegetable compartment 16 in order from the top. Here, the vacuum heat insulating material 3 on the side surface of the heat insulating box 22 is disposed so as to be in contact with the outer box side plate 1a. Further, the vacuum heat insulating material 3 is embedded in the rigid urethane foam 4 between the outer box side plate 1a and the inner box 2 while avoiding a high-temperature refrigerant pipe (not shown) for radiating heat that constitutes a part of the cooling device. The

  1 and 2 show a case where there are a total of four injection holes 30 of urethane, two places above the refrigerator body 21 and two places below. The upper injection nozzle 31 is inserted into the back plate 1 c above the refrigerator compartment 15, and the lower nozzle is inserted into the back plate 1 c of the freezer compartment 12 or the vegetable compartment 16.

  The vacuum heat insulating material 3 disposed on the side surface of the refrigerator compartment 15 has a rectangular parallelepiped spacer 24a formed of polystyrene foam or the like bonded and fixed to the rear end 3a of the refrigerator compartment 15 side. Further, the spacer 24 a is bonded and fixed to the side surface of the outer box 1.

  Further, in the vicinity of the lower injection hole 30, a rectangular parallelepiped spacer 24 b is provided in the rear end 3 a of the vacuum heat insulating material 3 on the refrigerator compartment 15 side so as not to prevent injection of the urethane stock solution injected from the injection nozzle 31. , 24 c are separated and arranged around the injection hole 30. The spacers 24b and 24c are bonded and fixed to the inner box 2. If necessary for fixing to the inner box 2, the spacer shape on the side to be fixed to the inner box 2 is partially matched to the shape of the inner box 2.

  As shown in FIG. 3, voids generated on the refrigerator compartment box side can be suppressed by arranging a rectangular parallelepiped spacer 24 between the outer box 1 and the vacuum heat insulating material 3. That is, when the foam filling speed of the urethane 4a is faster than the foam filling speed of the urethane 4b, it becomes a resistance of urethane foam flow, and the generation of voids is prevented by compensating for the speed difference.

  Further, when the foam filling speed of the urethane 4b is faster than the foam filling speed of the urethane 4a, as shown in FIG. 5, the spacer 24 can suppress the foam filling speed of the urethane 4a and suppress the generation of voids.

  Next, as shown in FIG. 4, a rectangular parallelepiped spacer 24 is disposed between the inner box 2 and the vacuum heat insulating material 3. Thereby, when the foam filling speed of the urethane 4b is faster than the foam filling speed of the urethane 4a, it becomes resistance of the urethane foam flow, and generation of voids is prevented by compensating for the speed difference.

  Further, when the foam filling speed of the urethane 4a is faster than the foam filling speed of the urethane 4b, as shown in FIG. 6, the spacer 24 can suppress the foam filling speed of the urethane 4a and suppress the generation of voids.

  Whether the spacer 24 is arranged in the space formed by the vacuum heat insulating material 3 and the outer box side plate 1a or in the space formed by the vacuum heat insulating material 3 and the inner box 2 is based on the foaming speed predicted in advance. It is better to place it. However, as described above, even when the urethane foam filling in the opposite side space is faster than expected, the generation of voids can be suppressed by the spacer 24 only on one side.

  In addition, when the foam filling speed just below the injection nozzle 31 is extremely high, the effect of further suppressing the foam filling speed can be obtained by arranging the spacers 24 on both sides of the space as shown in FIG.

  From the above, this embodiment can prevent the generation of voids by disposing the rectangular parallelepiped spacer 24.

DESCRIPTION OF SYMBOLS 1 Outer box 1a Outer box side board 1c Back board 2 Inner box 3 Vacuum heat insulating material 3a Rear end part 4 Hard urethane foam 12 Freezer room 15 Refrigerating room 16 Vegetable room 21 Refrigerator main body 22 Heat insulation box 23 Spaces 24a, 24c, 34b Spacer 30 Injection hole,
31 Injection nozzle

Claims (3)

An outer box and an inner box forming a refrigerator; a vacuum heat insulating material disposed between the outer box and the inner box; a gap between the outer box and the vacuum heat insulating material; and the inner box and the vacuum heat insulating material. In a refrigerator having a hard urethane foam filled in a gap between
A refrigerator, wherein a spacer is disposed between at least one of a rear end portion of the vacuum heat insulating material and the inner box or between a rear end portion of the vacuum heat insulating material and the outer box.   The refrigerator according to claim 1, wherein the spacer is a polystyrene foam material or a rigid urethane foam material.   2. The refrigerator according to claim 1, wherein the spacer is not disposed in the vicinity of the rigid urethane foam injection hole so as not to hinder the flow in the injection direction of the stock solution of the rigid urethane foam.

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