JP3792801B2 - Vacuum insulation - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vacuum heat insulator that can be used as a heat insulating material for a refrigerator or the like.
[0002]
[Prior art]
In recent years, from the viewpoint of global environmental protection, ozone layer destruction by CFC11 used as a foaming agent for refrigerator heat insulating materials has attracted attention on a global scale.
[0003]
From such a background, research on a heat insulating material using a new foaming agent has been conducted, and HCFC141b is being selected as a substitute for chlorofluorocarbons, and cyclopentane is being selected as a candidate for non-fluorocarbons.
[0004]
However, any of these new blowing agents has a higher gas thermal conductivity than CFC11, and the heat insulation performance of the refrigerator is inevitably lowered. On the other hand, energy saving of refrigerators is an unavoidable problem for the current energy regulations, and it is a major issue that should be achieved to improve heat insulation performance.
[0005]
As described above, current refrigerators have conflicting problems such as a decrease in heat insulation performance due to compliance with CFCs and an improvement in heat insulation performance to achieve energy saving.
[0006]
As one means for solving such conflicting problems, a vacuum heat insulator using an inorganic powder has been devised, and the contents thereof are described in JP-A-57-17389. The content is that a vacuum heat insulator is obtained by filling a film-like plastic container with a powder having a single particle diameter of 1 μm or less and sealing the inside after reducing the pressure.
[0007]
As an effect, it can be produced at a vacuum degree of 0.1 to 1 mmHg, which is easy to industrialize, and since the silica particles are fine powder, the heat insulation performance of the vacuum insulator is further improved when the vacuum degree is the same. It is a thing.
[0008]
[Problems to be solved by the invention]
The heat insulation principle of vacuum insulation is to eliminate air that conducts heat. However, it is difficult to achieve a high vacuum at an industrial level, and the degree of vacuum that can be achieved practically is 0.1 to 10 mmHg.
[0009]
Therefore, the desired heat insulation performance must be obtained at this degree of vacuum.
There is a mean free path as a physical property that affects the heat insulation performance when heat conduction is performed through the presence of air. The mean free path is the distance traveled until one of the molecules that make up the air collides with another molecule. If the void formed is larger than the mean free path, the molecules collide with each other in the gap. Since heat conduction by air occurs, the heat conductivity of the vacuum heat insulator increases. On the contrary, when the gap is smaller than the mean free path, the heat conduction of the vacuum heat insulator becomes small. This is because there is almost no heat conduction due to air collision.
[0010]
Therefore, if a powder having a fine particle size such as silica powder is used, the voids become fine, and heat conduction due to air collision is almost eliminated. As a result, the heat insulation performance of the vacuum heat insulator is improved. However, the conventional configuration has a drawback that the thermal conductivity of the whole vacuum heat insulating body is deteriorated when the jacket material is broken by an impact or the like and a leak occurs.
[0011]
Further, since silica powder is used, there are disadvantages that the weight of the vacuum heat insulator is increased and the cost is increased.
[0012]
On the other hand, there is a waste problem as a new problem in the global environmental problem. Even in household appliances such as refrigerators, the waste disposal problem is no exception, and how to recycle is a major issue. In particular, rigid urethane foam used as a heat insulating material for refrigerators has been difficult to recycle due to its material characteristics.
[0013]
In view of the above contents, the present invention suppresses deterioration of thermal conductivity even when leaked due to an external impact or the like, which has been a problem of a vacuum insulator, and achieves weight reduction, cost reduction, and high performance. It is intended to recycle urethane foam.
[0014]
[Means for Solving the Problems]
  In order to solve the above problems, the vacuum insulator of the present invention isIt consists of an air-permeable inner bag in which a core material made of a powder material is filled discontinuously, and an outer jacket material that encloses the inner bag. The difference is 10 deg The inner bag is thermally welded at the discontinuous portion of the core material, and the inner bag and the jacket material are heat welded at the discontinuous portion of the core material, so that a plurality ofIt is a vacuum heat insulator having an independent vacuum part.
[0015]
  Therefore, even when the jacket material is broken and leaks due to an external impact or the like, a vacuum heat insulating body in which deterioration of the thermal conductivity of the entire vacuum heat insulating body is suppressed can be obtained. Also,Since the material used for the core material is limited to the powder material, even when the degree of vacuum deteriorates, the change in thermal conductivity is small. Therefore, when the jacket material breaks and leaks due to an impact or the like, the vacuum degree adjacent to the leaked portion is likely to deteriorate due to gas permeation or the like, but the deterioration of the thermal conductivity caused by this can be reduced. . Further, the difference in melting point between the inner bag and the heat-welded portion of the jacket material is 10 deg Since it is the following, it is easy to form an independent vacuum part by thermal welding between the inner bag and the jacket material, and the material melting point of the thermal welding part is close, so that either material is thermally deteriorated Is resolved.
[0016]
  Moreover, the vacuum insulator of the present invention isIn addition to the above configuration, the envelope material is formed into a bag shape by heat welding between laminated films having a vapor-deposited layer, or a laminate film having a vapor-deposited layer and a laminate film having a metal foil.It is a vacuum insulator.
[0017]
  Since the jacket material has a vapor deposition layer, there is no problem with heat leakage through the jacket material.
[0018]
  Moreover, the vacuum insulator of the present invention isIn addition to the above configuration, the heat-welded layer and the inner bag of the jacket material are made of high-density polyethylene resin.It is a vacuum insulator.
[0019]
  Since the heat-welded layer of the jacket material is made of high-density polyethylene, the stress resistance is improved, and deterioration of the heat-welded portion can be suppressed.
[0020]
  Moreover, the vacuum insulator of the present invention isIn addition to the above configuration,It is a vacuum heat insulator whose core material contains hard urethane foam powder.
[0021]
Therefore, since the hard urethane foam powder is used as the core material, the resin thermal conductivity is low, and the thermal conductivity can be reduced when applied to a vacuum heat insulator. In addition, urethane foam used in refrigerators can be recycled.
[0022]
  The heat insulation panel of the present invention isOf the present inventionIt is a heat insulation panel in which a vacuum heat insulator and a hard urethane foam are multilayered.
[0023]
Therefore, the heat insulation performance is superior to that of a urethane heat insulation panel used for ordinary house heat insulation. In addition, the vacuum insulation body, which is multilayered with rigid urethane foam, has multiple independent vacuum parts and uses a powder material for the core material. Is added and leaks, the vacuum degree of the entire vacuum heat insulating body is not deteriorated, and the deterioration of the thermal conductivity as the heat insulating panel can be suppressed.
[0024]
  Further, the heat insulating box of the present invention is an outer box, an inner box, and a heat insulating box filled with a foam heat insulating material in a space formed by the outer box and the inner box, and the inner surface of the outer box or the inner box. In addition,Of the present inventionIt is the heat insulation box which provided the vacuum heat insulating body.
[0025]
Therefore, even when the vacuum heat insulator leaks, the deterioration of the overall thermal conductivity is small. Therefore, when applied to a refrigerator, there is no rapid deterioration of the heat conductivity of the vacuum heat insulator even when used for a long time.
[0026]
As a result, the problem that the operation rate of the compressor becomes excessive and the reliability of the refrigerator is lowered due to the rapid deterioration of the thermal conductivity of the vacuum heat insulating body is solved.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
The invention described in claim 1 of the present invention includes a core material and a jacket material that encloses the core material, and the laminate material includes a vapor deposition layer or a laminate film having a vapor deposition layer. A laminate film having a metal foil is formed into a bag shape by thermal welding, and a thermal welding layer of the jacket material is formed of a high-density polyethylene resin, and a plurality of the core materials are filled in the jacket material. And the outer jacket material is thermally welded between the core members, and is a vacuum heat insulator having an independent vacuum portion.
[0028]
In general, when the jacket material is torn due to an external impact or the like, the vacuum degree is remarkably deteriorated, and in some cases, it reaches atmospheric pressure. As a result, the heat insulation performance deteriorates because gas heat conduction due to collision of gas molecules such as air increases.
[0029]
In the present invention, since independent vacuum parts are formed, even if a part of the jacket material breaks, other vacuum parts are not affected. As a result, the deterioration of the thermal conductivity of the vacuum insulator as a whole is reduced.
[0030]
Moreover, since the jacket material has a vapor deposition layer, there is no problem with heat leakage through the jacket material. Moreover, since the heat-welding layer of the jacket material is made of high-density polyethylene, the stress resistance is improved, and deterioration of the heat-welded portion can be suppressed.
[0031]
According to a second aspect of the present invention, there is provided an air-permeable inner bag, a core material made of a powder material filled in the inner bag, and a jacket material that encloses the inner bag and the core material. The inner bag has a high-density polyethylene resin, and the outer jacket material is a laminated film having a vapor-deposited layer, or a laminate film having a vapor-deposited layer and a laminate film having a metal foil are formed into a bag shape by heat welding. The outer cover material is formed of a high-density polyethylene resin, the core material is filled with a plurality of the core materials, and the height of the outer cover material is increased between the core materials. It is a vacuum heat insulating body having an independent vacuum part in which a density polyethylene resin and a high-density polyethylene resin in the inner bag are heat-welded.
[0032]
Therefore, since the space which the core material has is very small, there is little influence by gas heat conduction, and even when the degree of vacuum deteriorates, the deterioration of heat conductivity is small.
[0033]
According to a third aspect of the present invention, there is provided an air-permeable inner bag, a core material made of a powder material filled in the inner bag, and a jacket material that encloses the inner bag and the core material. A difference in melting point between the inner bag and the heat-welding layer of the outer jacket material is 10 deg or less, and a plurality of the inner bag and the outer jacket material are heat-welded at a portion between the core members. It is a vacuum heat insulator having an independent vacuum part.
[0034]
In order to form an independent vacuum portion, a difference in melting point between the inner bag, the heat-welded portion of the jacket material, and the heat-welded portion of the jacket material becomes a problem. If the melting points are the same, there is no problem, but material selection will be limited. On the other hand, if the difference between the melting points is too large, heat welding cannot be performed properly, and an independent vacuum portion cannot be formed.
[0035]
In the present invention, the difference in melting point between the inner bag and the outer jacket material is limited to 10 deg or less, and it is easy to form an independent vacuum portion by the thermal welding between the inner bag and the outer jacket material. And since the material melting | fusing point of a heat welding part is near, the problem that either material heat-deteriorates is solved.
[0036]
The invention according to claim 4 of the present invention encloses an air-permeable inner bag, a plurality of core materials made of a powder material filled in the inner bag, and the inner bag and the core material. The inner bag and the outer cover material have a melting point difference of 10 deg or less, and the inner bag and the outer cover material are thermally welded at a portion between the core members. Thus, the vacuum heat insulator has a plurality of independent vacuum parts, and the core material includes hard urethane foam powder.
[0037]
Therefore, it is possible to recycle the rigid urethane foam that has been used as a heat insulating material for the refrigerator, and solve the waste problem. In addition, since the powder is a rigid urethane foam, the resin has a low resin thermal conductivity, and when applied to a vacuum insulator, the thermal conductivity can be reduced.
[0038]
This is because the thermal bond energy is high because the urethane bond has a double bond, and as a result, the solid thermal conductivity is reduced.
[0039]
The invention according to claim 5 of the present invention encloses an air-permeable inner bag, a plurality of core materials made of a powder material filled in the inner bag, and the inner bag and the core material. The inner bag and the outer cover material have a melting point difference of 10 deg or less, and the inner bag and the outer cover material are thermally welded at a portion between the core members. By this, it is the heat insulation panel which laminated | stacked the vacuum heat insulating body which has several independent vacuum parts, and hard urethane foam.
[0040]
Therefore, the heat insulation performance is superior to that of a urethane heat insulation panel used for ordinary house heat insulation.
[0041]
In addition, the vacuum heat element that is layered with rigid urethane foam has multiple independent vacuum parts and uses a powder material for the core material. Is added and leaks, the vacuum degree of the entire vacuum heat insulating body is not deteriorated, and the deterioration of the thermal conductivity as the heat insulating panel can be suppressed.
[0042]
On the other hand, the heat insulation box according to claim 6 of the present invention is the heat insulation box in which a space formed by the outer box, the inner box, and the outer box and the inner box is filled with a foam heat insulating material. The inner surface of the box or inner box comprises a breathable inner bag, a plurality of core materials made of a powder material filled in the inner bag, and a jacket material that encloses the inner bag and the core material. A difference in melting point between the inner bag and the heat-welded layer of the jacket material is 10 deg or less, and a plurality of independent cases are obtained by heat-welding the inner bag and the jacket material at a portion between the core materials. And a heat insulating box provided with a vacuum heat insulating material in which the core material includes hard urethane foam powder.
[0043]
Therefore, since the change in the overall thermal conductivity is small even when the vacuum insulator leaks, when applied to a refrigerator, there is no sudden deterioration in the thermal conductivity of the vacuum insulator even when used for a long time.
[0044]
As a result, the problem that the operation rate of the compressor becomes excessive and the reliability of the refrigerator is lowered due to the rapid deterioration of the thermal conductivity of the vacuum heat insulating body is solved.
[0045]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
(Embodiment 1)
In the figure, reference numeral 1 denotes a vacuum heat insulating body, and a core material 2 made of a water foam continuous foam having a cell diameter of 150 μm cut to a size of 5 cm square is dried at 120 ° C. for 4 hours, and is preliminarily set at 4 locations at intervals of 5 cm in parallel with the decompression direction After a plurality of the core materials 2 are discontinuously filled in the heat-welded jacket material 3, the inside is vacuum-sealed so that the inside has a vacuum degree of 0.1 mmHg. Thereafter, the jacket material 3 is obtained by heat welding at the discontinuous portion of the core material 2 so that an independent vacuum part 4 can be formed.
[0046]
Since the vacuum insulator 1 obtained in this way forms the independent vacuum part 4, even if a part of the jacket material 3 breaks, it does not affect other vacuum parts. As a result, the deterioration of the thermal conductivity of the vacuum insulator as a whole is reduced.
[0047]
(Embodiment 2)
In the figure, reference numeral 5 denotes a vacuum heat insulator, in which a core material 6 made of silica powder is discontinuously filled in a non-woven medium bag 7 made of high-density polyethylene resin, and dried at 120 ° C. for 2 hours to absorb adsorbed moisture. Remove enough.
[0048]
In order to form independent vacuum portions 8, the inner bag 7 is preliminarily heat-welded at a predetermined interval parallel to the decompression direction, and then the core material 6 is placed in the space portion of the inner bag 7 formed by the above processing. A predetermined amount is filled discontinuously, and then the inner bag 7 is thermally welded at the discontinuous portion of the core material 6. The above operation is repeated, and the filling of the core material 6 into the inner bag 7 is completed. Thereafter, the core material 6 filled in the inner bag 7 is filled in the jacket material 9 and sealed under reduced pressure so that the inside has a vacuum degree of 0.1 mmHg.
[0049]
The vacuum heat insulating body 5 thus obtained has a very small space in the core material, so that there is little influence of gas heat conduction, and even when the degree of vacuum is deteriorated, the deterioration of thermal conductivity is small.
[0050]
(Embodiment 3)
The inner bag 7 is a breathable non-woven fabric produced using a high-density polyethylene resin, the outer cover material 9 is a high-density polyethylene resin having a thickness of 50 μm in the heat-welded layer, and a gas barrier property having an aluminum vapor-deposited layer in the intermediate layer. A polyethylene-vinyl alcohol copolymer resin having a thickness of 12 μm and a polyethylene terephthalate resin having a thickness of 12 μm in the outermost layer.
[0051]
Since the temperature difference between the inner bag 7 and the heat-welding layer of the jacket material 9 is 10 deg or less, the vacuum heat insulating body 5 having such a structure has an independent vacuum portion by heat welding between the inner bag and the jacket material. Since it is easy to form and the material melting point of the heat welded part is close, the problem that one of the materials is thermally deteriorated is solved.
[0052]
(Embodiment 4)
A urethane powder having an average particle diameter of 120 μm obtained by pulverizing rigid urethane foam is used as the core material 6 and filled in a non-woven medium bag 7 and dried at 120 ° C. for 2 hours to sufficiently remove adsorbed moisture. In order to form independent vacuum parts, the inner bag 7 is preliminarily heat-welded at a predetermined interval parallel to the decompression direction, and then the core 6 is placed in the space part of the inner bag 7 formed by the above processing. After the fixed amount filling, the inner bag 7 is heat-welded in the direction perpendicular to the decompression direction. The above operation is repeated, and the filling of the core material 6 into the inner bag 7 is completed. Thereafter, the core material 6 filled in the inner bag 7 is filled in the jacket material 9 and sealed under reduced pressure so that the inside has a vacuum degree of 0.1 mmHg.
[0053]
Therefore, it is possible to recycle the rigid urethane foam that has been used as a heat insulating material for the refrigerator, and solve the waste problem. In addition, since the powder is a rigid urethane foam, the resin has a low resin thermal conductivity, and when applied to a vacuum insulator, the thermal conductivity can be reduced.
[0054]
This is because the thermal bond energy is high because the urethane bond has a double bond, and as a result, the solid thermal conductivity is reduced.
[0055]
(Embodiment 5)
In the figure, reference numeral 10 denotes a heat insulating panel, which is formed by multilayering the vacuum heat insulating body 4 and the rigid urethane foam 11. The thickness of the rigid urethane foam is preferably about 30 mm in consideration of nailing during construction. Moreover, workability | operativity can be improved further when the peripheral part of the heat insulation panel 10 is covered with crushed wood.
[0056]
Since the heat insulation panel 10 obtained in this way is a multilayer of the vacuum heat insulator 4 and the rigid urethane foam 11, the heat insulation performance is superior to a urethane heat insulation panel used for ordinary house heat insulation.
[0057]
In addition, the vacuum insulation body, which is multilayered with rigid urethane foam, has multiple independent vacuum parts and uses a powder material for the core material. Is added and leaks, the vacuum degree of the entire vacuum heat insulating body is not deteriorated, and the deterioration of the thermal conductivity as the heat insulating panel can be suppressed.
[0058]
(Embodiment 6)
In the figure, reference numeral 12 denotes a heat insulating box composed of a vacuum heat insulating material 4, a foam heat insulating material 11 made of rigid foamed urethane foam, an outer box 13 and an inner box 14. The vacuum insulator 4 is attached to the inner surface of the outer box 13, but may be the inner surface of the inner box 14. Moreover, the size of the vacuum heat insulating body 4 is 0.5 m x 0.5 m x 0.02 m.
[0059]
The heat insulation box having the above-described configuration has a small change in the overall thermal conductivity even when the vacuum heat insulator leaks. There is no sudden deterioration in thermal conductivity.
[0060]
As a result, the problem that the operation rate of the compressor becomes excessive and the reliability of the refrigerator is lowered due to the rapid deterioration of the thermal conductivity of the vacuum heat insulating body is solved.
[0061]
【Example】
(Example 1)
FIG. 5 shows a temporal change in thermal conductivity when a hole having a diameter of 1 mm is formed in a vacuum heat insulating body having a size of 25 cm × 25 cm and an independent vacuum part formed by thermal welding every 5 cm.
[0062]
As the core material, a water foam continuous foam having a cell diameter of 150 μm was used, and a vacuum heat insulator having no independent vacuum part, which was conventionally performed, was used as a comparative example.
[0063]
[Figure 5]
From FIG. 5, it can be seen that in the specification according to the present invention, the temporal change of the thermal conductivity is remarkably smaller than that of the comparative example. This is because in the specification according to the present invention, an independent vacuum part is formed, so even if a part of the jacket material breaks, other vacuum parts are not affected. The heat conduction due to is increased only in the space of the torn part of the jacket material, and the deterioration of the thermal conductivity of the vacuum insulator as a whole is reduced.
[0064]
(Example 2)
FIG. 6 shows a temporal change in thermal conductivity when a hole with a diameter of 1 mm is made in a vacuum heat insulating body having a size of 25 cm × 25 cm and an independent vacuum part formed by thermal welding every 5 cm. .
[0065]
In the examples, silica powder having an average particle diameter of 10 μm was used as the core material, and as a comparative example, a vacuum heat insulating body having a water foam continuous foam having a cell diameter of 150 μm was not used as the core material.
[0066]
[Fig. 6]
From FIG. 6, there is no significant difference from the initial stage to the third day, but thereafter the thermal conductivity gradually deteriorates in the comparative example.
[0067]
On the other hand, in this example, no significant deterioration in thermal conductivity is observed after 3 days.
Since this forms an independent vacuum part, even if a part of the jacket material is broken in a short period of time, it does not affect other vacuum parts. For this reason, although the deterioration of thermal conductivity was not recognized until the 3rd, after that, the degree of vacuum of other portions gradually deteriorated due to the permeation of gas.
[0068]
Therefore, in the foam having a large air gap distance as used in the comparative example, the collision of gas molecules is frequent, so that the thermal conductivity is deteriorated.
[0069]
In the present invention, since the powder material having the characteristic that the air gap distance becomes very short is used for the core material, collision of gas molecules does not occur even if the degree of vacuum deteriorates, and heat conduction deteriorates over time. The smaller.
[0070]
(Example 3)
FIG. 7 shows a case where a difference in melting point between the melting point of the inner bag and the heat-welding layer of the jacket material is changed, and a vacuum heat insulating body having a size of 25 cm × 25 cm and having an independent vacuum part formed by heat welding every 5 cm. The time change of the thermal conductivity when a hole having a diameter of 1 mm is formed is shown.
[0071]
[Fig. 7]
From FIG. 7, it can be seen that the thermal conductivity gradually deteriorates when the difference in melting point is from 0 deg to 10 deg, but the thermal conductivity is severely deteriorated when the difference in melting point is larger than 10 deg.
[0072]
This is because if the difference in melting point between the inner bag and the jacket material heat-welded layer is 10 deg or less, a good welded state is formed and gas permeation through the heat-welded portion is suppressed. However, if the difference between the melting points is larger than 10 deg, the material having a high melting point has not reached a sufficient molten state, so that poor heat welding occurs and gas permeation from the welded portion occurs.
[0073]
For this reason, it is not possible to form a sufficiently independent vacuum part, and if the outer cover material has a hole or the like, the deterioration of the thermal conductivity over time becomes severe.
[0074]
In the present invention, in view of this point, when the difference in melting point between the inner bag and the heat-welded layer of the jacket material is limited to 10 deg or less, the heat-welded portion can be in a good state, and the jacket material is broken. It is possible to suppress the deterioration of the thermal conductivity.
[0075]
(Example 4)
FIG. 8 shows a comparison of thermal conductivity when urethane powder having an average particle size of 120 μm and silica powder having an average particle size of 20 μm obtained by pulverizing rigid urethane foam as a core material are used as the core material, respectively. It is. In order to ignore the influence on the degree of vacuum, the degree of vacuum was 0.1 mmHg.
[0076]
[Fig. 8]
From the results of FIG. 8, it can be seen that the example using the urethane powder according to the present invention shows low thermal conductivity. Urethane bonds have double bonds and high thermal vibration energy. As a result, since the solid thermal conductivity can be reduced, the thermal conductivity of the vacuum heat insulator is lowered.
[0077]
Therefore, the powder used for the core material cannot be selected at random, and needs to be limited to a specific material.
[0078]
In the present invention, in view of the above implementation, the powder is limited to urethane powder, so that a vacuum heat insulator having a particularly low thermal conductivity can be obtained.
[0079]
Moreover, since the utilization of the urethane foam currently used as a heat insulating material for refrigerators etc. is attained as an effect to comprise, it is useful also for the solution of the recycling problem in a refrigerator.
[0080]
(Example 5)
Since the heat insulating panel 8 is a multilayer of the vacuum heat insulating body 4 and the hard urethane foam 9, it is superior in heat insulating performance to a urethane heat insulating panel used for ordinary house heat insulation.
[0081]
FIG. 9 compares the thermal conductivity of a general residential heat insulation urethane board and the heat insulation panel of the present invention.
[0082]
FIG. 9
From FIG. 9, it can be seen that the heat insulation panel of the present invention is about three times better in thermal conductivity. By using such a heat insulation panel having excellent heat insulation performance, not only contributes to energy saving of the house, but also shortens the construction period by reducing the wall thickness of the house.
[0083]
Moreover, since the heat insulation panel 8 forms the independent vacuum part, even if a part of the vacuum heat insulating body 4 breaks a bag at the time of construction etc., the influence on the whole is small.
[0084]
(Example 6)
Next, although it is a heat insulation box, since the vacuum insulator 4 to be applied forms an independent vacuum part and the core material to be applied is a powder, the entire heat even when the vacuum insulator leaks. Small change in conductivity. As a result, when applied to a refrigerator, even if it is used for a long time, there is no sudden deterioration of the thermal conductivity of the vacuum insulator.
[0085]
As a result, the problem that the operation rate of the compressor becomes excessive and the reliability of the refrigerator is lowered due to the rapid deterioration of the thermal conductivity of the vacuum heat insulating body is solved.
[0086]
【The invention's effect】
  As described above, the vacuum insulator of the present invention isIt consists of an air-permeable inner bag in which a core material made of a powder material is filled discontinuously, and an outer jacket material that encloses the inner bag. The difference is 10 deg The inner bag is thermally welded at the discontinuous portion of the core material, and the inner bag and the jacket material are heat welded at the discontinuous portion of the core material, so that a plurality ofIt is a vacuum heat insulator having an independent vacuum part.
[0087]
  Therefore, even when the jacket material is broken and leaks due to an external impact or the like, a vacuum heat insulating body in which deterioration of the thermal conductivity of the entire vacuum heat insulating body is suppressed can be obtained. Also,Since the material used for the core material is limited to the powder material, even when the degree of vacuum deteriorates, the change in thermal conductivity is small. Therefore, when the jacket material breaks and leaks due to an impact or the like, the vacuum degree adjacent to the leaked portion is likely to deteriorate due to gas permeation or the like, but the deterioration of the thermal conductivity caused by this can be reduced. . Further, the difference in melting point between the inner bag and the heat-welded portion of the jacket material is 10 deg Since it is the following, it is easy to form an independent vacuum part by thermal welding between the inner bag and the jacket material, and the material melting point of the thermal welding part is close, so that either material is thermally deteriorated Is resolved.
[0088]
  Moreover, the vacuum insulator of the present invention isIn addition to the above configuration, the envelope material is formed into a bag shape by heat welding between laminated films having a vapor-deposited layer, or a laminate film having a vapor-deposited layer and a laminate film having a metal foil.It is a vacuum insulator.
[0089]
  Since the jacket material has a vapor deposition layer, there is no problem with heat leakage through the jacket material.
[0090]
  Moreover, the vacuum insulator of the present invention isIn addition to the above configuration, the heat-welded layer and the inner bag of the jacket material are made of high-density polyethylene resin.It is a vacuum insulator.
[0091]
  Since the heat-welded layer of the jacket material is made of high-density polyethylene, the stress resistance is improved, and deterioration of the heat-welded portion can be suppressed.
[0092]
  Moreover, the vacuum insulator of the present invention isIn addition to the above configuration,It is a vacuum heat insulator whose core material contains hard urethane foam powder.
[0093]
Therefore, since the hard urethane foam powder is used as the core material, the resin thermal conductivity is low, and the thermal conductivity can be reduced when applied to a vacuum heat insulator. In addition, urethane foam used in refrigerators can be recycled.
[0094]
  The heat insulation panel of the present invention isOf the present inventionIt is a heat insulation panel in which a vacuum heat insulator and a hard urethane foam are multilayered.
[0095]
Therefore, the heat insulation performance is superior to that of a urethane heat insulation panel used for ordinary house heat insulation.
[0096]
In addition, the vacuum insulation body, which is multilayered with rigid urethane foam, has multiple independent vacuum parts and uses a powder material for the core material. Is added and leaks, the vacuum degree of the entire vacuum heat insulating body is not deteriorated, and the deterioration of the thermal conductivity as the heat insulating panel can be suppressed.
[0097]
  Further, the heat insulating box of the present invention is an outer box, an inner box, and a heat insulating box filled with a foam heat insulating material in a space formed by the outer box and the inner box, and the inner surface of the outer box or the inner box. In addition,Of the present inventionIt is the heat insulation box which provided the vacuum heat insulating body.
[0098]
Therefore, even when the vacuum heat insulator leaks, the deterioration of the overall thermal conductivity is small. Therefore, when applied to a refrigerator, there is no rapid deterioration of the heat conductivity of the vacuum heat insulator even when used for a long time.
[0099]
As a result, the problem that the operation rate of the compressor becomes excessive and the reliability of the refrigerator is lowered due to the rapid deterioration of the thermal conductivity of the vacuum heat insulating body is solved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a vacuum insulator according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a vacuum insulator according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view of a heat insulation panel according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view of a heat insulating box according to an embodiment of the present invention.
FIG. 5 is a characteristic diagram showing the change over time in the thermal conductivity of a vacuum insulator.
FIG. 6 is a characteristic diagram showing the change over time in the thermal conductivity of the vacuum insulator.
FIG. 7 is a characteristic diagram showing the change over time in the thermal conductivity of a vacuum insulator.
FIG. 8 is a characteristic diagram showing the thermal conductivity of the vacuum heat insulator due to the difference in the core material.
[Figure 9] Performance characteristics of insulation panel
[Explanation of symbols]
1 Vacuum insulator
2 Core material
3 Jacket material

Claims (6)

It consists of an air-permeable inner bag in which a core material made of a powder material is filled discontinuously, and an outer jacket material that encloses the inner bag, and has a melting point between the inner bag and the heat-welded layer of the outer jacket material. The difference is 10 deg or less, the inner bag is heat-welded at the discontinuous portion of the core material, and the inner bag and the jacket material are heat-welded at the discontinuous portion of the core material. A vacuum insulator having a plurality of independent vacuum parts. Laminate film each other envelope material has a vapor deposition layer, or vacuum thermal insulator according laminate film in claim 1 which is in a bag shape by heat welding with a laminate film and a metal foil having a vapor deposition layer. The vacuum heat insulating body according to claim 1 or 2, wherein the heat-welded layer and the inner bag of the jacket material are made of high-density polyethylene resin . The vacuum heat insulating body as described in any one of Claim 1 to 3 with which a core material contains hard urethane foam powder. The heat insulation panel which laminated | stacked the vacuum heat insulating body as described in any one of Claim 1 to 4, and hard urethane foam. In the heat insulation box body which filled the space formed by the outer box, the inner box, and the outer box and the inner box with the foam heat insulating material, the inner surface of the outer box or the inner box is any one of claims 1 to 4. A heat insulating box provided with the vacuum heat insulating body according to one item .

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