JP4580843B2 - Vacuum heat insulating material and refrigerator using the same - Google Patents

Description

  The present invention relates to a vacuum heat insulating material and a refrigerator using the same.

(Prior art 1)
As a conventional vacuum heat insulating material, there exists a thing shown by Unexamined-Japanese-Patent No. 2001-336691 (patent document 1). In the vacuum heat insulating material described in Patent Document 1, a core material formed by laminating at least two layers of sheet-like molded bodies made of inorganic fibers having an average diameter of 1 μm or more and 5 μm or less is covered with a gas barrier film, and the inside thereof is covered. It is a vacuum-sealed and sealed, and at least one groove is formed in a side surface perpendicular to the thickness direction of the vacuum heat insulating material by compression molding, so that the vacuum heat insulating material can be bent. is there.
(Prior art 2)
Moreover, as a conventional vacuum heat insulating material, there exist some which were shown by Unexamined-Japanese-Patent No. 2004-197954 (patent document 2). The vacuum heat insulating material described in Patent Document 2 has a gas barrier outer cover material having a heat-welded layer and a plate-shaped core material, and the outer cover is closely attached without surrounding the core material. A vacuum heat insulating material in which a peripheral portion composed only of a material is formed, and the vacuum heat insulating material has a thickness of 0.5 mm or more and 5 mm or less, and the peripheral portion is matched to the shape of the core material to easily form a vacuum of any shape. This makes it possible to produce a heat insulating material.
(Prior art 3)
Moreover, as a conventional vacuum heat insulating material, there exists a thing shown by Unexamined-Japanese-Patent No. 2002-81596 (patent document 3). The vacuum heat insulating material described in Patent Document 3 is a vacuum heat insulating material comprising an inorganic fiber core material having a fiber diameter distribution peak value of 1 μm or less and 0.1 μm or more, and an outer skin material having gas barrier properties. Since the material is composed of SiO2 as a main component and does not include a binder for solidifying the fiber material, the material has flexibility as a vacuum heat insulating material.

JP 2001-336691 A JP 2004-197954 A JP 2002-81596 A

  In recent years, from the viewpoint of global warming, the necessity of reducing the power consumption of home appliances is desired. And since the refrigerator is a product that consumes a lot of electric power among household electrical appliances, it is proposed to reduce the amount of heat leakage of the heat insulating box by adopting a vacuum heat insulating material in the heat insulating box of the refrigerator. ing. In order to promote the application development of this vacuum heat insulating material, the deformability and shape retainability should be improved so that the vacuum heat insulating material can be arranged along the shape of the mounted part without incurring cost increase or deterioration of heat insulating performance. Granting has become an important issue.

  However, in the vacuum heat insulating material (prior art 1) of Patent Document 1, a groove is formed in the side surface perpendicular to the thickness direction in the vacuum heat insulating material by compression molding, and the vacuum heat insulating material is bent at the groove portion thinned in the thickness direction. As a result, the thickness of the vacuum heat insulating material is reduced at the groove, and the heat insulating performance at the groove is reduced. Patent Document 1 does not disclose the shape retention of the vacuum heat insulating material when the vacuum heat insulating material is deformed along the shape of the attached portion.

  Moreover, in the vacuum heat insulating material (prior art 2) of patent document 2, since the part comprised only from the jacket material which does not contain a core material remains between a core material and a heat welding part, in the part There was a problem that the heat insulation performance deteriorated. Patent Document 2 does not disclose the shape retention of the vacuum heat insulating material when the vacuum heat insulating material is deformed along the shape of the attached portion.

  Moreover, in the vacuum heat insulating material (prior art 3) of patent document 3, when a vacuum heat insulating material is deformed along the shape of a to-be-attached part, by the force (spring back force) which a vacuum heat insulating material tries to return to the original. There was a problem that it was separated from the mounting surface of the mounted portion. In addition, in the vacuum heat insulating material of patent document 3, since the ultrafine inorganic fiber having a peak value of the fiber diameter distribution of 1 μm or less and 0.1 μm or more is used, even a single product is low in productivity and expensive, and the fiber aggregate is overlapped. It was necessary to increase the thickness, leading to an increase in the cost of the vacuum heat insulating material.

  The objective of this invention is providing the vacuum heat insulating material which can hold | maintain the shape deform | transformed along the to-be-attached part, ensuring a heat insulation performance, and a refrigerator using the same.

A first aspect of the present invention for achieving the above object is a vacuum heat insulating material obtained by vacuum-sealing a core material in a jacket material having a gas barrier property, wherein the core material does not contain a binder. Alternatively, it is formed of an organic fiber polymer, and can be deformed together with the core material in the jacket material, and after being deformed by causing a deviation from the core material due to a compressive stress or a tensile stress when bent by applying a bending load. The deformation holding member capable of holding the core material shape released from the bending load is disposed.

A more preferable specific configuration example in the first aspect of the present invention is as follows.
(1) The core material is formed of a plate-like organic fiber polymer, and the deformation holding member is formed in a film shape and installed inside the core material.
(2) The core material is formed of a plurality of layers of fiber polymers, and the deformation holding member is interposed between the layers of the fiber polymers.
(3) The size of the film-shaped deformation holding member is made smaller than the size of the core material.
(4) The vacuum heat insulating material is in a bent shape that can be installed in a bent portion of a mounted portion having a curved surface radius of 10 mm or more from a flat shape .
(5) The film-shaped deformation holding member is formed of aluminum having heat shielding properties.
(6) The core material is degassed and compressed, and stored in the inner bag together with the deformation holding member, and the inside including the inner bag in the outer jacket material storing the inner bag is decompressed and sealed. .

Further, according to the second aspect of the present invention, a vacuum heat insulating material obtained by vacuum-sealing a core material in a jacket material having gas barrier properties is disposed in a space formed by an outer box and an inner box, and the vacuum In the refrigerator in which the space around the heat insulating material is filled with the foam heat insulating material, the core material is formed of an inorganic or organic fiber polymer not containing a binder, and the core material is combined with the core material. by placing a compressive stress or tensile deformation holding member for holding the bending core material shaped load is released after deformation is produced core material and displaced by stress when bent by adding the deformed and bending load The vacuum heat insulating material is configured, and the vacuum heat insulating material is deformed and arranged along the deformed portion of the outer box or the inner box.

A more preferable specific configuration example in the second aspect of the present invention is as follows.
(1) The vacuum heat insulating material is bent and installed at a corner where two surfaces of the outer box or the inner box intersect.
(2) The magnitude | size of the curved-surface radius of the corner | angular part of the said inner box is 10 mm or more.
(3) The end of the vacuum heat insulating material that is bent and installed along the corner of the inner box and the end of the vacuum heat insulating material that extends the flat surface of the outer box are superposed on the projection surface.

  ADVANTAGE OF THE INVENTION According to this invention, the vacuum heat insulating material which can hold | maintain the shape deform | transformed along the to-be-attached part, ensuring a heat insulation performance, and a refrigerator using the same can be provided.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. The same reference numerals in the drawings of the respective embodiments indicate the same or equivalent. In addition, this invention includes making it more effective by combining each embodiment suitably as needed.
(First embodiment)
The vacuum heat insulating material of 1st Embodiment of this invention and the refrigerator using the same are demonstrated using FIGS. 1-5.

  First, the whole refrigerator of this embodiment is demonstrated, referring FIG. FIG. 1 is a longitudinal sectional view showing a vacuum heat insulating material according to a first embodiment of the present invention and a refrigerator using the same.

  The refrigerator includes a refrigerator box 20 formed in a box shape and a door 6 that opens and closes a front opening of the refrigerator box 20. The refrigerator box 20 includes an outer box 23, an inner box 21, vacuum heat insulating materials 30 and 80 (described later) installed in a heat insulating wall formed by the outer box 23 and the inner box 21, and the outer box 23. Further, it is constituted by a foam heat insulating material 22 such as urethane which can be bonded to the inner box 21 and the vacuum heat insulating materials 30 and 80 and has an adhesive force to itself. The heat insulating wall is composed of a bottom wall, side walls, a top wall, and a back wall. The lowermost door 6 includes an outer box, an inner box, a vacuum heat insulating material 80 described later installed in a heat insulating wall formed by the outer box and the inner box, the outer box, the inner box, and the vacuum heat insulating material. 80 and a foamed heat insulating material such as urethane having an adhesive force to itself. A vacuum heat insulating material 80 may be installed on the upper door 6.

  Moreover, the box 20 of the refrigerator forms a plurality of storage chambers 10 to 12 having different temperatures, and partition walls (not shown) are provided between the storage chambers 10 to 12. The storage room 10 is a low temperature storage room (specifically, a freezing room), and is arranged at the lowermost part of the plurality of storage rooms. The storage room 11 is a storage room (specifically a vegetable room) whose temperature is higher than that of the low temperature storage room 10, and is arranged in an intermediate part of the plurality of storage rooms. The storage room 12 is a storage room (specifically, a refrigeration room) having a higher temperature than the storage room 10 having a low temperature, and is disposed at the top of the plurality of storage rooms. The storage chambers 10 to 12 are cooled using a refrigeration cycle including a compressor 13, a condenser 14, a decompression device, a cooler, and the like, and a cooling fan.

  The inner box 21 constitutes a wall surface that forms the storage chambers 10 to 12 and includes a bottom surface, both side surfaces, a top surface, and a back surface. The outer box 23 constitutes a wall surface that forms the appearance of the box 20 of the refrigerator, and includes a bottom surface, both side surfaces, a top surface, and a back surface. In addition, it has the step part for forming the machine room which accommodates a compressor in the back side of the bottom wall of the box 20 of a refrigerator, and the bottom face of the inner box 21 and the outer box 23 is a step accompanying this. Has a part.

  The vacuum heat insulating material 30 is a vacuum heat insulating material disposed along the bent portion 24 of the heat insulating wall. When the vacuum heat insulating material 30 is installed on the inner box 21 side of the bent portion 24, the vacuum heat insulating material 30 is formed on the inner box 21 along the shape of the inner box 21. It is installed in close contact. Further, when the vacuum heat insulating material 30 is installed on the outer box 23 side of the bent portion 24, it is installed along the shape of the outer box 23.

  The bent portion 24 of the heat insulating wall is a portion constituting a deformed portion of the heat insulating wall. And the deformation | transformation part which is an uneven | corrugated | grooved part etc. in the inner box 21 or the outer box 23 other than the bending part 24 which is a corner | angular part where the two surfaces in the inner box 21 or the outer box 23 cross | intersect the deformation | transformation part of the heat insulation wall. included.

  The vacuum heat insulating material 80 is a vacuum heat insulating material disposed on the flat surface portion of the heat insulating wall, and as described later with reference to FIG. It is the vacuum heat insulating material arrange | positioned. An end portion of the vacuum heat insulating material 80 installed along one surface (back surface) of the outer box 23 extends from the one surface (upper surface) of the inner box 21 through the bent portion 24 along the other surface (back surface). It is superposed at the end of 30 and the projection surface. With such a configuration, the installation area of the vacuum heat insulating materials 80 and 30 can be increased while ensuring the filling property of the foam heat insulating material 22, and the heat insulating performance can be improved.

  Next, an installation example of the vacuum heat insulating material on the bending portion 24 in the present embodiment will be described with reference to FIG. FIG. 2 is an enlarged cross-sectional view of a portion C in FIG. In FIG. 2, in order to facilitate understanding of the vacuum heat insulating material 30, the vacuum heat insulating material 30 is emphasized from FIG.

  In FIG. 2, a vacuum heat insulating material 30 is a vacuum heat insulating material disposed so as to be in close contact with the inner box surface 21a along the shape of the inner box surface 21a of the bent portion 24 of the heat insulating wall. A core material formed of an inorganic fiber polymer or organic fiber polymer that does not contain a binder is housed in the material 31 together with 32 and a getter agent that adsorbs gas, and is vacuum-sealed at a predetermined degree of vacuum. Configured. As the inorganic fiber polymer or the organic fiber polymer, a highly versatile polymer having an average fiber diameter of 3 μm to 5 μm is used, and the peak value of the fiber diameter distribution used in the vacuum heat insulating material of the prior art 3 is 1 μm or less, 0 It can be made cheaper than ultra fine inorganic fibers of 0.1 μm or more.

  The vacuum heat insulating material 30 is manufactured in a substantially planar shape as described later with reference to FIG. 3 so that the productivity of the vacuum heat insulating material 30 itself can be improved at the time of manufacturing. And when incorporating the vacuum heat insulating material 30 manufactured as a substantially planar shape into the box body 20 of the refrigerator, as described above, the vacuum heat insulation is performed so as to closely adhere to the shape of the inner box surface 21a of the bent portion 24. The material 30 is installed in a bent state.

  Therefore, in this embodiment, the vacuum heat insulating material manufactured as a substantially planar shape is bent at a predetermined curved surface radius R1 and at a predetermined angle Θ1 as shown in FIG. In the core material 32 formed of an inorganic fiber polymer or an organic fiber polymer so that it can be held, for example, with a deformation holding member made of metal such as aluminum or synthetic resin such as polyethylene terephthalate resin or polyamide resin A film 33 is interposed.

  By having the structure which has the film 33 which is a deformation | transformation holding member in the core material 32, this film 33 functions as an aggregate so to speak, and the shape of the vacuum heat insulating material 30 is hold | maintained.

  As an example of a method of interposing the film 33 in the core material 32, as shown in FIG. 2, the core material 32 having a predetermined thickness t1 has a t2 size or a t3 size smaller than the t1 size. Even if the vacuum heat insulating material 30 is bent at a predetermined curved surface radius R1 and a predetermined angle Θ1 by making a plurality of layers 32a and 32b and installing a film 33 between the plurality of layers 32a and 32b, The inorganic fiber polymer or organic fiber polymer constituting the layers 32a and 32b of the core material 32 is less damaged, and damage to the jacket material 31 by the inorganic fiber polymer or organic fiber polymer is reduced. It is configured.

  That is, in FIG. 2, when the film 33 described above is not installed, when the core member 32 having the thickness t1 is bent, the length L1 of the curved surface formed by the inner surface radius R1 and the outer surface radius R3 (L1). = 2π × R1 × Θ1 / 360) and the L3 size (L3 = 2π × (R1 + t1) × Θ1 / 360) are forcibly a difference ΔL3 size (ΔL3 = L3−L1) in the inner radius R1. Or the outer surface radius R3 is forcibly subjected to a tensile force, so that the inorganic fiber polymer or organic fiber polymer forming the core member 32 may be broken at a certain rate. There is.

  Therefore, in the present embodiment, the core material 32 having a predetermined thickness t1 is separated by the film 33 into a plurality of layers 32a and 32b having a thickness t2 or t3 smaller than the thickness t1. Therefore, when the core member 32 is bent, the plurality of layers 32a or 32b are individually bent. Therefore, in the layer 32a, the length L1 of the curved surface formed by the inner surface radius R1 and the outer surface radius R2 is measured. The difference ΔL1 size (ΔL1 = L2−L1) between (L1 = 2π × R1 × Θ1 / 360) and the L2 size (L2 = 2π × (R1 + t2) × Θ1 / 360) is smaller than the above-described ΔL3 size. In the layer 32b, the length L2 of the curved surface formed by the inner surface radius R2 and the outer surface radius R3 (L2 = 2π × R2 × Θ1 / 360) and the L3 size (L3 = 2π × (R2 + t3) × Θ1 The difference between the 360) [Delta] L2 dimension (ΔL2 = L3-L2) component is smaller than ΔL3 dimensions described above. As a result, the amount of compression that is forcibly compressed in each inner radius R1 portion or outer radius R2 portion becomes smaller than that in the above-described dimension ΔL3, or the inner radius R2 portion or outer radius R3 becomes smaller. Since the amount that is forcibly pulled in the portion is smaller than that in the above-described dimension ΔL3, the degree of destruction of the inorganic fiber polymer or organic fiber polymer forming the layer 32a and the layer 32b is reduced, and the inorganic fiber polymer is reduced. Or it is comprised so that the damage of the jacket material 31 by an organic fiber polymer may decrease.

  Further, the layers 32a and 32b having a thickness smaller than the thickness t1 of the core material 32 are formed, and the layers are bent between the inorganic fiber polymer or the organic fiber polymer forming these layers. A film-like member that can be displaced due to compression stress or tensile stress, for example, a film 33 made of a metal such as aluminum or a synthetic resin such as polyethylene terephthalate resin or polyamide resin is interposed. When the film is bent to a predetermined angle Θ1 with a curved surface radius R1, the amount of elastic deformation of the core material 32 with respect to a predetermined bending load increases because the layers 32a and 32b of the core material 32 and the film 33 are displaced from each other. It is configured as follows.

  In order not to suppress the deviation between the film 33 and the layer 32a or 32b, it is desirable to set the dimensions L4 and L5 that protrude from the curved surface portions R1, R2, and R3 shown in FIG. 2 to be larger than zero.

  Next, the vacuum heat insulating material 30 before bending will be described with reference to FIG. FIG. 3 is a cross-sectional view showing a state before the vacuum heat insulating material 30 of FIG. 2 is bent.

  In FIG. 3, the vacuum heat insulating material 30 is manufactured with a predetermined surface 30 a having a substantially planar shape so that the productivity of the vacuum heat insulating material 30 itself can be improved. The dimension W3 in the figure indicates the size of the film 33 described above. By making the dimension W3 of the film 33 smaller than the dimension W1 of the core material 32, the film 33 and the jacket material are shown. 31 is configured so that a heat bridge is less likely to occur. In other words, the envelope 31 of the vacuum heat insulating material 30 is a composite laminate in which a metal foil such as aluminum or a metal vapor deposition layer is usually used as an intermediate layer, and a film such as a synthetic resin is laminated on the front and back surfaces in order to improve gas barrier properties. Since a film is used, if the separation distance between the jacket material 31 and the film 33 is small, there is a possibility that a heat bridge may occur at the portion due to the thermal conductivity of the metal foil or the metal vapor deposition layer. Accordingly, in the present embodiment, the dimensions W <b> 2 and W <b> 4 are formed between the film 33 and the jacket material 31 so that the heat bridge is less likely to occur.

  When a metal film such as aluminum having heat reflectivity is used for the film 33, the larger the size dimension W3 of the film 33, the greater the heat reflection effect. In that case, the dimensions W2 and W4 are ensured. However, it is desirable to set the W3 dimension as large as possible.

  Next, the relationship between the amount of deformation of the vacuum heat insulating material and the bending load will be described with reference to FIG. FIG. 4 is an explanatory view of bending characteristics of the vacuum heat insulating materials of the present embodiment and the comparative example. For example, the characteristics when the vacuum heat insulating material having the substantially planar shape of FIG. 3 described above is bent as shown in FIG. It is explanatory drawing. In FIG. 4, the vertical axis represents the bending load applied to bend the vacuum heat insulating material, and the horizontal axis represents the amount of deformation, for example, the ΔL3 dimension described above with reference to FIG. 2 (inner radius R1 and outer radius R3 in FIG. 2). Difference in the length of the curved surface formed by

  A curve A shown by a dotted line in FIG. 4 is a characteristic when the vacuum heat insulating material of the comparative example having no film is bent. Under an initial load, a proportional curve A1 in which the bending load and the deformation amount are approximately proportional is drawn. When a certain load N2 is exceeded, a curve A2 is drawn in which a part of the inorganic fiber polymer or organic fiber polymer that forms the core material breaks down and the amount of deformation rapidly increases. When a bending load of more than that is applied, the fiber is almost broken, so that a curve A3 in which the amount of deformation increases due to an increase in the fine load is drawn.

  On the other hand, a curve B shown by a solid line in FIG. 4 is a characteristic when the vacuum heat insulating material 30 of the present embodiment is bent. For example, as described above with reference to FIG. In this case, the film 33 described above is interposed between the layers. As shown in FIG. 4, under an initial load, a proportional curve B1 in which the bending load and the amount of deformation are approximately proportional is drawn, and the gradient is gentler than the curve A1 described above. That is, the amount of deformation for a predetermined bending load increases. This is an effect in which the thickness of the core material is divided into a plurality of layers thinner than the thickness of the core material by the film 33 described above, and the deformation amount (δ2) is based on the experiments of the inventors. The amount of deformation (δ1) increased by about 20%.

  In addition, also in the vacuum heat insulating material 30 of this embodiment, when the bending load is increased and exceeds a certain load N1, the inorganic fiber polymer or the organic fiber polymer forming the core material 32 is partially broken. A curve B2 in which the deformation amount increases rapidly is drawn. When a bending load of more than that is applied, the fiber is almost broken, so that a curve B3 in which the amount of deformation increases due to an increase in the fine load is drawn. As described above, when the inorganic fiber polymer or the organic fiber polymer forming the core material 32 is broken, the vacuum space formed by the fiber is also broken and the contact between the fibers is increased. It is the same as that of the conventional vacuum heat insulating material that may cause a decrease in the temperature.

  Therefore, in the present embodiment, it is desirable to set the ΔL1 dimension (ΔL1 = L2-L1) and the ΔL2 dimension (ΔL2 = L3-L2) described in FIG. 2 to be equal to or less than the above-described deformation amount (δ2).

  According to the above-described embodiment, the vacuum heat insulating material 30 in which the core material 32 is vacuum-sealed is disposed along the bent portion 24 in the jacket material 31 having gas barrier properties, and the core material 32 is made of the inorganic fiber polymer. Alternatively, it is formed of an organic fiber polymer, and the film 33 is interposed in the thickness of the core member 32 so as to face the bending portion 24. Therefore, when the vacuum heat insulating material 30 is bent, a predetermined bending load is applied. In contrast, the amount of elastic deformation of the core material 32 increases, and the inorganic fiber polymer or the organic fiber polymer constituting the core material 32 is less damaged. It is possible to provide the vacuum heat insulating material 30 having the shape bendability while maintaining the excellent heat insulating performance with less damage to the workpiece 31. In addition, when the vacuum heat insulating material 30 is bent, the core material 32 and the film 33 of the bent portion are displaced from each other. Therefore, it is possible to provide the vacuum heat insulating material 30 having shape retaining property that holds the bent state. .

  Further, since the core material 32 is composed of an inorganic fiber polymer or an organic fiber polymer of a plurality of layers 32a and 32b and the film 33 is interposed between the layers, when the vacuum heat insulating material 30 is bent, Since the layers 32a and 32b made of an inorganic fiber polymer or an organic fiber polymer and the film 33 are displaced from each other, the vacuum heat insulating material 30 having a shape bendability and a shape retainability can be provided.

  Further, the core material 32 is composed of a plurality of layers 32a and 32b, the film 33 is interposed between the layers, and the size of the film 33 is made smaller than the size of the core material 32. Therefore, the jacket material 31 having gas barrier properties is provided. Since a heat bridge is unlikely to occur between the portion having good thermal conductivity provided in the film 33 and the film 33, a vacuum heat insulating material having a shape bendability and a shape retainability is provided while maintaining an excellent heat insulation performance. it can.

  In addition, since the core material 32 is formed of an inorganic fiber polymer or an organic fiber polymer that does not contain a binder, when the vacuum heat insulating material is bent, the amount of deformation that the core material elastically deforms is large. It is possible to provide a vacuum heat insulating material excellent in shape retention.

  In addition, since the film 33 is made of aluminum having heat shielding properties, the aluminum film performs heat shielding and heat reflection, and vacuum insulation having shape folding and shape retaining properties while maintaining excellent heat insulation performance. The material 30 can be provided.

  Further, in the refrigerator in which the vacuum heat insulating material 30 in which the core material 32 is vacuum-sealed in the jacket material 31 having gas barrier properties is disposed along the bent portion, the curved surface radius of the bent portion is set to 10 mm or more. When the vacuum heat insulating material 30 is bent, the inorganic fiber polymer or the organic fiber polymer constituting the core material 32 is less likely to be destroyed, so that the covering material 31 is damaged by the inorganic fiber polymer or the organic fiber polymer. Therefore, it is possible to provide a refrigerator that retains excellent heat insulation performance for a long period of time.

  Further, in the refrigerator in which the vacuum heat insulating material 30 in which the core material 32 is vacuum-sealed is disposed along the bent portion in the jacket material 31 having gas barrier properties, the core material 32 is made of an inorganic fiber polymer or an organic fiber polymer. Since the film 33 is interposed in the thickness of the core member 32 so as to face the bent portion, the vacuum heat insulating material 30 is efficiently installed in the bent portion while maintaining excellent heat insulating performance. As a result, it is possible to provide an energy-saving refrigerator.

  Next, description will be made with reference to Table 1 and FIG. Table 1 is an explanatory table of various test data of Experimental Examples 1 to 3 and Comparative Example 1 of the vacuum heat insulating material of this embodiment, and FIG. It is explanatory drawing.

  In FIG. 5, reference numeral 50 denotes a heat insulating wall formed in a substantially inverted L shape as a model of a box of a refrigerator or the like, and has a bending radius R4 of a bending portion 51a having a bending angle Θ2 substantially perpendicular. An inner box 51, an outer box 53, a hard urethane 52 provided in a heat insulating wall formed by the outer box 53 and the inner box 51, and a vacuum heat insulating material panel 40 described later are configured. The vacuum heat insulating material panel 40 vacuums a core material 42 made of glass wool {JIS M 9504 “artificial mineral fiber heat insulating material”} having an average fiber diameter of 3 μm to 5 μm in a jacket 41 having a gas barrier property at a predetermined degree of vacuum. It is configured to be sealed, and is formed by sandwiching a film 43 described later in Table 1 in the core material 42. Reference numeral 54 denotes a measuring jig configured to install the heat insulating wall 50 and measure the amount of heat leakage of the heat insulating wall 50.

  The experimental examples 1 to 3 and the comparative example 1 without a film when the film 43 interposed in the vacuum heat insulating material panel 40 in FIG. In addition, all the numerical values shown in Table 1 are such that the L6 dimension in FIG. 5 is 140 mm, the t6 dimension is 50 mm, the size of the vacuum heat insulating material 40 is 250 mm × 250 mm, and the thickness of the vacuum heat insulating material is from 8 mm. It is an experimental data value when it is 10 mm.

(Experimental example 1)
In Experimental Example 1, an aluminum film having a size of 200 mm × 200 mm and a thickness of 30 μm is sandwiched between glass wool not containing a binder having an average fiber diameter of 3 μm to 5 μm as a core material of the vacuum heat insulating material 40, and further at 180 ° C. It was produced by performing an aging treatment for 1 hour. After that, a getter agent (molecular sieves 13X / activated carbon) that adsorbs gas is filled in the jacket material 41 having gas barrier properties, and 10 minutes by a rotary pump of a vacuum packaging machine, 10 minutes by a diffusion pump, and a vacuum heat insulating material After exhausting until the internal pressure became 1.3 Pa, the end portion of the covering material 41 was sealed with heat sealing. Experimental Examples 1 to 3 are specific forms applied to the first embodiment.

  The thermal conductivity of the vacuum heat insulating material 40 thus obtained was measured at 10 ° C. using AUTO-Λ manufactured by Eihiro Seiki Co., Ltd. Further, the shape bendability is determined by using a bending tester so that the bending radius R4 of the bending portion shown in FIG. 5 is 10 mm (speed: 10 mm / min, distance between fulcrums: 100 mm) The indenter was a round bar of Φ20 mm), and the maximum bending load (N) at a displacement amount: 80 mm) was measured and evaluated. Further, the shape retention was observed after 4 hours. As a result, the shape bendability was 96 N, and the shape retention was good. Moreover, the heat conductivity was 2.6 mW / m · K, and data that could reduce the amount of heat leakage by 28% compared to the case where the vacuum heat insulating material 40 was not inserted were obtained.

From this, the vacuum heat insulating material in the form of Experimental Example 1 can achieve the simultaneous improvement of shape bendability, shape retention and thermal conductivity, and the vacuum heat insulating material in the form of Experimental Example 1 is inserted into the refrigerator box. By doing so, reduction of heat leakage and energy saving can be expected.
(Experimental example 2)
The vacuum heat insulating material 40 of Experimental Example 2 was produced in the same manner as Experimental Example 1. As a core material of the vacuum heat insulating material 40 of Experimental Example 2, a polyethylene terephthalate film having a size of 200 mm × 200 mm and a thickness of 50 μm is sandwiched in glass wool not containing a binder having an average fiber diameter of 3 μm to 5 μm, and further at 180 ° C. It was produced by performing an aging treatment for 1 hour. After that, a getter agent (molecular sieves 13X / activated carbon) that adsorbs gas is filled in the jacket material 41 having gas barrier properties, and 10 minutes by a rotary pump of a vacuum packaging machine, 10 minutes by a diffusion pump, and a vacuum heat insulating material After exhausting until the internal pressure became 1.3 Pa, the end portion of the covering material 41 was sealed with heat sealing.

  The vacuum heat insulating material 40 of Experimental Example 2 obtained in this way was measured under the same conditions as in Experimental Example 1. As a result, the shape bendability was 95 N, and the shape retention was good. Moreover, the thermal conductivity was 2.8 mW / m · K, and data was obtained that could reduce the amount of heat leakage by 26% compared to the case where the vacuum heat insulating material 40 was not inserted.

Therefore, the vacuum heat insulating material of Experimental Example 2 can improve the shape bendability, shape retention, and thermal conductivity, and heat leakage can be achieved by inserting the vacuum heat insulating material of Experimental Example 2 into the refrigerator box. Reduction of amount and energy saving can be expected.
(Experimental example 3)
The vacuum heat insulating material 40 of Experimental Example 3 was produced in the same manner as Experimental Example 1. As a core material of the vacuum heat insulating material 40 of Experimental Example 3, a polyamide resin film having a size of 200 mm × 200 mm and a thickness of 50 μm is sandwiched in glass wool not containing a binder having an average fiber diameter of 3 μm to 5 μm, and further at 180 ° C. It was produced by performing an aging treatment for 1 hour. After that, a getter agent (molecular sieves 13X / activated carbon) that adsorbs gas is filled in the jacket material 41 having gas barrier properties, and 10 minutes by a rotary pump of a vacuum packaging machine, 10 minutes by a diffusion pump, and a vacuum heat insulating material After exhausting until the internal pressure became 1.3 Pa, the end portion of the covering material 41 was sealed with heat sealing.

  The vacuum heat insulating material 40 of Experimental Example 3 obtained in this way was measured under the same conditions as in Experimental Example 1. As a result, the shape bendability was 94N and the shape retention was good. Moreover, the thermal conductivity was 2.8 mW / m · K, and data was obtained that could reduce the amount of heat leakage by 26% compared to the case where the vacuum heat insulating material 40 was not inserted.

Therefore, the vacuum heat insulating material of Experimental Example 3 can improve the shape bendability, shape retention and thermal conductivity, and the amount of heat leakage can be obtained by inserting the vacuum heat insulating material of Experimental Example 3 into the refrigerator box. Reduction and energy saving can be expected.
(Comparative Example 1)
As a core material of the vacuum heat insulating material 40 of Comparative Example 1, glass wool not containing a binder having an average fiber diameter of 3 μm to 5 μm was used, and the film was not sandwiched in the core material at 180 ° C. for 1 hour. An aging treatment was performed. After that, a getter agent (molecular sieves 13X / activated carbon) that adsorbs gas is filled in the jacket material 41 having gas barrier properties, and 10 minutes by a rotary pump of a vacuum packaging machine, 10 minutes by a diffusion pump, and a vacuum heat insulating material After exhausting until the internal pressure became 1.3 Pa, the end portion of the covering material 41 was sealed with heat sealing.

  The vacuum heat insulating material 40 thus obtained was measured under the same conditions as in Experimental Example 1. As a result, the shape bendability was as large as 125N, and the shape retention was somewhat poor. Further, the thermal conductivity was 3.5 mW / m · K, which was about 40% higher than the thermal conductivity before bending.

  From this, in a state where no film or the like is sandwiched in the core material, the thickness of the entire core material (about 8 mm to 10 mm) is bent at a time when bending, so the bending load increases due to its rigidity, In addition, when the film is not sandwiched in the core material when bent, a part of the core material made of glass wool is broken by bending stress, and the vacuum space made of glass wool fiber is broken by the breakage. It seems that the thermal conductivity increases.

And as a result of installing the vacuum heat insulating material 40 of the comparative example 1 in the heat insulation wall 50 of FIG. 5, and measuring the amount of heat leaks, compared with the case where the vacuum heat insulating material 40 is not inserted, it is 16 in heat leak amount. % Data was obtained, but as described above, the glass wool fiber was broken in the bent portion, and the vacuum space held by the glass wool fiber was reduced due to the breakage. .
(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view of a main part of a vacuum heat insulating material and a refrigerator using the same according to a second embodiment of the present invention. The second embodiment is different from the first embodiment in the points described below, and the other points are basically the same as those in the first embodiment, so that the duplicate description is omitted.

  In FIG. 6, the vacuum heat insulating material 60 is disposed so as to be in close contact with the inner box surface 21a along the shape of the inner box surface 21a of the bent portion 24 of the heat insulating wall of a refrigerator or the like, and has a gas barrier property. In 61, a core material 62 described later is vacuum-sealed at a predetermined degree of vacuum.

  The core material 62 is divided into a plurality of layers 62a, 62b, 62c, 62d, 62e thinner than the total thickness t7 of the core material 62 so that the vacuum heat insulating material 60 itself can be easily bent. A plurality of films 63a, 63b, 63c, 63d made of metal such as aluminum or synthetic resin such as polyethylene terephthalate resin are interposed.

  Out of the layers obtained by dividing the core material 62 in the thickness direction, the outermost layers 62a and 62e are made of an inorganic fiber polymer or an organic fiber polymer containing a binder, so that the surface rigidity of the vacuum heat insulating material 60 is increased. The other layers 62b, 62c, and 62d are made of an inorganic fiber polymer or an organic fiber polymer that does not contain a binder, thereby shortening the evacuation time when the vacuum heat insulating material 60 is manufactured. It is configured so that it can be realized.

  The layer 62a or 62e composed of an inorganic fiber polymer or an organic fiber polymer containing a binder is cured to some extent by fibers bonded with the binder, and bending stress when the vacuum heat insulating material 60 is bent. In this case, it is desirable to make the thickness of the layers 62a and 62e thinner, or to set the radius R6 of the bending curved surface to be larger.

  FIG. 6 shows an example in which the core material 62 is divided into five layers. However, depending on the use of the vacuum heat insulating material, when the thickness t7 of the core material is large, or the radius R6 of the bending curved surface of the bending portion 24 is shown. Is small, the core material 62 is divided into 6 or more layers, and the film is interposed between the layers, and a binder is added to the inorganic fiber polymer or the organic fiber polymer constituting each layer. It is desirable to set whether or not based on productivity and rigidity.

  In addition, the vacuum heat insulating material 60 is desirably manufactured in a substantially planar shape as described above with reference to FIG. 3 so that the productivity of the vacuum heat insulating material 60 itself can be improved. The state at the time of manufacturing the vacuum heat insulating material 60 is bent in advance to a predetermined angle according to the angle of the bending angle Θ3 of the bending portion 24 shown in FIG. 6, the radius R6 of the bending curved surface, or the overall thickness t7 of the core material. It may be manufactured.

Since it is comprised as mentioned above, since 2nd Embodiment comprised the core material 62 with the inorganic fiber polymer of multiple layers or the organic fiber polymer, and interposed the film between the layers, a vacuum heat insulating material When the film is bent, the layers 62a, 62b, 62c, 62d, 62e made of an inorganic fiber polymer or an organic fiber polymer and the films 63a, 63b, 63c, 63d of the bent part are displaced from each other. Therefore, it is possible to provide a vacuum heat insulating material having shape bendability and shape retaining property and a refrigerator using the vacuum heat insulating material while maintaining excellent heat insulating performance.
(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 7: is principal part sectional drawing of the vacuum heat insulating material of 3rd Embodiment of this invention, and a refrigerator using the same. The third embodiment is different from the first embodiment in the points described below, and the other points are basically the same as those in the first embodiment, and thus redundant description is omitted.

  In FIG. 7, a vacuum heat insulating material 70 is a vacuum heat insulating material disposed so as to be in close contact with the inner box surface 21a along the shape of the inner box surface 21a of the bent portion 24 of the heat insulating wall of a refrigerator or the like, and has a gas barrier property. A plurality of inner bags 74a and 74b, which will be described later, are installed in the outer jacket material 71 having the above structure, and the outer jacket material 71 is vacuum-sealed at a predetermined degree of vacuum.

  The inner bags 74a and 74b are configured so as to store the core materials 72a and 72b sandwiched between the metal films or the synthetic resin films 73a and 73b by deaeration and compression. Further, the inner bags 74a and 74b have smooth surfaces such as high-density polyethylene resin so that the inner bags 74a and 74b can be displaced from each other by the bending stress when the vacuum heat insulating material 70 is bent. It is formed of a simple synthetic resin film.

  In FIG. 7, two inner bags 74 a and 74 b are provided in the jacket material 71 to make it easy to bend using the deviation between the inner bags 74 a and 74 b and the jacket material 71. Depending on the use of the heat insulating material, as an inner bag, for example, a plurality of films may be interposed in the inner bag as illustrated in FIG. An inner bag may be provided.

  In addition, the vacuum heat insulating material 70 is desirably manufactured in a substantially planar shape as described above with reference to FIG. 3 so that the productivity of the vacuum heat insulating material 70 itself can be improved at the time of manufacture. Depending on the bending angle Θ4 of the bending portion 24 shown in FIG. 7 and the radius R7 of the bending curved surface or the overall thickness t8 of the core material, the vacuum heat insulating material 70 is bent in advance at a predetermined angle. May be manufactured.

  Since it is configured as described above, in the third embodiment, the inner bags 74a and 74b for storing the core materials 72a and 72b sandwiching the films 73a and 73b by deaeration and storing, and the inner bags 74a and 74b are stored. And the outer cover material 71 that is displaced between the inner bags 74a and 74b. Therefore, when the vacuum heat insulating material 70 is bent, the inner bag 74a and 74b and the outer cover material 71 are displaced. Since it is easy to occur, the vacuum heat insulating material which has shape bendability and shape retainability, and the refrigerator using a vacuum heat insulating material can be provided, maintaining the outstanding heat insulation performance.

It is a longitudinal cross-sectional view which shows the vacuum heat insulating material of 1st Embodiment of this invention, and a refrigerator using the same. It is sectional drawing to which the C section of FIG. 1 was expanded. It is sectional drawing which shows the state before bending of the vacuum heat insulating material of FIG. It is bending characteristic explanatory drawing of the vacuum heat insulating material of 1st Embodiment and a comparative example. It is explanatory drawing of the heat insulation wall which measured the amount of heat leaks of the vacuum heat insulating material shown in Table 1. It is principal part sectional drawing of the vacuum heat insulating material of 2nd Embodiment of this invention, and a refrigerator using the same. It is principal part sectional drawing of the vacuum heat insulating material of 3rd Embodiment of this invention, and a refrigerator using the same.

Explanation of symbols

  20 ... Refrigerator box, 21 ... Inner box, 22 ... Foam insulation, 23 ... Outer box, 24 ... Bending part (deformation part), 30, 40, 60, 70 ... Vacuum insulation, 31, 41, 61, 71 ... Cover material, 32, 42, 62a, 62b, 62c, 62d, 62e, 72a, 72b ... Core material, 33, 43, 63a, 63b, 63c, 63d, 73a, 73b ... Film (deformation holding member), 50 ... heat insulation wall, 54 ... measuring jig, 74a, 74b ... inner bag.

Claims (11)

A vacuum heat insulating material obtained by vacuum-sealing a core material in a jacket material having gas barrier properties,
The core material is formed of an inorganic or organic fiber polymer containing no binder ,
The core material wherein the bending load after deformation is caused the core material and the deviation by compression stress or tensile stress when the and bending load deformable together with the core material bent in addition to the outer covering material within is released A vacuum heat insulating material characterized in that a deformation holding member capable of holding a shape is disposed. The vacuum heat insulating material according to claim 1, wherein the core material is formed of a plate-like organic fiber polymer, and the deformation holding member is formed in a film shape and installed inside the core material. Vacuum insulation.   The vacuum heat insulating material according to claim 1 or 2, wherein the core material is formed of a plurality of layers of fiber polymer, and the deformation holding member is interposed between layers of the fiber polymer. .   The vacuum heat insulating material according to claim 2, wherein the size of the film-shaped deformation holding member is smaller than the size of the core material. The vacuum heat insulating material according to claim 3 , wherein the vacuum heat insulating material is in a bent shape that can be installed in a bent portion of a mounted portion having a curved surface radius of 10 mm or more from a flat shape. Vacuum insulation material.   The vacuum heat insulating material according to claim 2, wherein the film-shaped deformation holding member is formed of aluminum having heat shielding properties.   The vacuum heat insulating material according to claim 1 or 2, wherein the core material is degassed and compressed and stored together with the deformation holding member in an inner bag, and the inner bag in the outer jacket material storing the inner bag. A vacuum heat insulating material characterized in that the inside is reduced in pressure and sealed. A vacuum heat insulating material obtained by vacuum-sealing a core material in a jacket material having a gas barrier property is disposed in a space formed by the outer box and the inner box, and a foam heat insulating material is provided in the space around the vacuum heat insulating material. In a refrigerator filled with
The core material is formed of an inorganic or organic fiber polymer containing no binder ,
Core material shape the bending load after deformation is produced core material and the deviation is canceled by the compression stress or tensile stress when the bent adding deformed and bending load with the core material in the outer covering material in The vacuum heat insulating material is configured by arranging a deformation holding member that holds
The refrigerator, wherein the vacuum heat insulating material is deformed and arranged along a deformed portion of the outer box or the inner box.   The refrigerator according to claim 8, wherein the vacuum heat insulating material is bent and installed at a corner where two surfaces of the outer box or the inner box intersect.   The refrigerator according to claim 9, wherein the curved surface radius of the corner of the inner box is 10 mm or more.   The refrigerator according to claim 9, wherein an end portion of the vacuum heat insulating material that is bent and installed along a corner portion of the inner box and an end portion of the vacuum heat insulating material that extends the flat surface of the outer box are projected on the projection surface. A refrigerator characterized by polymerization.

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