JP4778996B2 - Vacuum heat insulating material and refrigerator using the same - Google Patents

Description

The present invention relates to a refrigerator according to the vacuum heat insulator and a vacuum heat insulating material.

As a social effort to prevent global warming, energy conservation is being promoted in various fields in order to control CO ₂ emissions. In recent years, electric appliances, particularly household appliances related to cooling and heating, mainly use vacuum heat insulating materials to enhance heat insulating performance from the viewpoint of reducing power consumption. In addition, in order to reduce energy consumption from various raw materials to product manufacturing processes, energy saving is promoted by promoting recycling of raw materials and reducing fuel and electricity costs in the manufacturing process. .

  As a conventional example of a vacuum heat insulating material used in energy-saving products currently distributed in the market, there is one disclosed in Patent Document 1, but this vacuum heat insulating material uses glass wool, which is glass fiber, as a core material. The interior is covered with a gas barrier coating material and the inside is in a reduced pressure state. Glass wool, which is the core material, is formed by pressing at a high temperature at which the glass fiber begins to thermally deform so that it has a constant thickness. Since the core material does not contain a binder, it has a good heat insulation performance. A heat insulating material is obtained. As an application example of this vacuum heat insulating material, an example used with a urethane foam heat insulating material such as a refrigerator is shown.

  On the other hand, as a conventional example of a vacuum heat insulating material considering recyclability, there is one disclosed in Patent Document 2, but this vacuum heat insulating material contains 50% by weight or more of polyester fiber having a fiber thickness of 1 to 6 denier. A sheet-like fiber assembly is used as a core material. By using this fiber diameter, heat insulation performance that exceeds that of conventional open-cell urethane foam is achieved, and recyclability after use is extremely excellent.

Moreover, the vacuum heat insulating material shown by patent document 3 uses the core material formed by processing the fiber assembly containing two types of polyester fibers from which melting | fusing point differs into a sheet form. Thereby, not only the environmental load is small, but it is easy to process into a sheet shape, and realizes a heat insulation performance at a level comparable to a conventional urethane foam plate-like core material.
Japanese Patent Laid-Open No. 2005-220954 JP 2006-29505 A JP 2006-57213 A

  However, the vacuum heat insulating materials of Patent Documents 1 to 3 have the following problems. In other words, since the vacuum heat insulating material of Patent Document 1 uses glass wool as a core material, it can withstand the temperature that rises during urethane foaming and of course has good heat insulating performance and contributes to energy saving of equipment. In the process up to manufacturing the heat insulating material, the consumption of heat energy is enormous in the glass wool manufacturing process obtained by melting and fiberizing glass and the core manufacturing process obtained by pressing at high temperature. As a result, there are overall issues regarding cost performance and environmental considerations.

  The vacuum heat insulating material of Patent Document 2 using polyester fiber as the core material has heat resistance to the temperature that rises due to urethane foaming in refrigerators, etc., and is patented in terms of energy consumption during core material manufacture Although more environmentally conscious than the invention of Document 1, since the sheet-like processing is performed by the needle punch method, the polyester fibers are partly bundled so that heat conduction is facilitated. It is significantly inferior to a vacuum heat insulating material having glass wool as a core material.

  In addition, in the vacuum heat insulating material of Patent Document 3, since the low melting point fiber plays a role of a binder, there is a point that it is easy to process into a sheet shape, but the low melting point fiber is crushed and contact between the fibers is increased, thereby conducting heat. It is easy, and is far inferior to the vacuum heat insulating material which made glass wool the core material of patent document 1 etc. in the heat insulation performance surface. As described above, conventionally known vacuum heat insulating materials have a bad balance between energy consumption during production and heat insulating performance, and have advantages and disadvantages.

  An object of the present invention is to provide a vacuum heat insulating material that suppresses energy consumption at the time of manufacturing a vacuum heat insulating material, has a small environmental load, can achieve a high level of heat insulating performance, and ensures a certain heat resistant temperature. . The present invention also provides a vacuum heat insulating material including at least a part of a core material obtained by fiberizing a resin material.

In order to solve the above problems, the present invention mainly adopts the following configuration.
A vacuum heat insulating material comprising a core material made of a fiber assembly and a jacket material having a gas barrier property, wherein the core material is a resin fiber assembly disposed in a central layer thereof, and both sides of the resin fiber assembly A fiber aggregate disposed in the surface layer of the surface layer, and the fiber aggregate of the surface layer is a material whose softening temperature is higher than the softening temperature of the resin fiber aggregate of the central layer, A vacuum heat insulating material in which a fiber aggregate is a polystyrene resin having a syndiotactic structure, and a resin fiber aggregate in the central layer is a polystyrene resin having an atactic structure .

Further, in the vacuum heat insulating material, instead of disposing the fiber aggregates on the surface layers on both sides of the resin fiber aggregate, the syndiotactic structure polystyrene resin is used on one surface layer of the resin fiber aggregate. Vacuum insulation material that arranges a certain fiber assembly .

Moreover, the refrigerator with which the said vacuum heat insulating material is installed with the foam heat insulating material in the space formed by an outer box and an inner box. Furthermore, the refrigerator with which the said vacuum heat insulating material is installed with a foam heat insulating material in the space facing a heat-emitting component containing a compressor, a control or power supply board, and a heat radiating pipe .

  According to the present invention, by adopting the resin fiber material as a part of the core material, it is possible to greatly reduce the electric / thermal energy consumed in the vacuum heat insulating material and the manufacturing process of the material. Conventionally, the vacuum heat insulating material using resin fiber material was inferior to the one using only glass wool as the core material in heat insulating performance, but according to the present invention, it is equivalent to the vacuum heat insulating material using only glass wool as the core material. Heat insulation performance can be realized, and a certain heat-resistant temperature can be secured.

  Furthermore, since the recycled resin collected from waste home appliances can be used as the resin material, it is possible to provide a highly recyclable vacuum heat insulating material and refrigerator.

  Configuration examples, usage examples, application examples, and comparative examples in the vacuum heat insulating material according to the embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram illustrating a configuration example of a vacuum heat insulating material according to an embodiment of the present invention. FIG. 2 is a diagram showing a usage example of the vacuum heat insulating material according to the present embodiment. FIG. 3 is a front view of a refrigerator to which the vacuum heat insulating material according to the present embodiment is applied. FIG. 4 is a cross-sectional view of a refrigerator to which the vacuum heat insulating material according to the present embodiment is applied, and is a cross-sectional view taken along the line AA in FIG. FIG. 5 is a diagram showing a comparison between a plurality of examples showing the configuration of the vacuum heat insulating material according to the present embodiment and a comparative example.

  In the drawings, 1 is a refrigerator, 2 is a refrigerator room, 3a is an ice making room, 3b is an upper freezer room, 4 is a lower freezer room, 5 is a vegetable room, 6a is a refrigerator room door, 6b is a refrigerator room door, and 7a is an ice making room. Door, 7b is an upper freezer compartment door, 8 is a lower freezer compartment door, 9 is a vegetable compartment door, 10 is a door hinge, 11 is a packing, 12 and 14 are heat insulating partitions, 13 is a partition member, 20 is a box, 21 Is an outer box, 21a is a top plate, 21b is a rear plate, 22 is an inner box, 23 is a heat insulating material, 27 is a blower, 28 is a cooler, 30 is a compressor, 31 is a condenser, 33 is expanded polystyrene, 40 is Recesses, 41, electrical parts, 42, cover, 45, interior lamp, 45a, case, 50, vacuum heat insulating material, 51, core material, 51a, 51b, fiber assembly, 52c, resin fiber assembly, 53 A workpiece and 54 represent inner bags, respectively.

"Example 1"
Example 1 which shows the structure of the vacuum heat insulating material 50 shown in FIG. 1 is comprised by the jacket material 53, the inner bag 54, the core material 51, and adsorption agent (not shown). The outer covering material 53 is not particularly limited as long as it has gas barrier properties, but in Example 1, a laminate film composed of four layers of a surface layer, a moisture-proof layer, a gas barrier layer, and a heat welding layer was used.

  Specifically, a polypropylene film having low hygroscopicity is provided as a surface layer, an aluminum vapor deposition layer is provided on a polyethylene terephthalate film as a moisture barrier layer, and a gas barrier layer is provided on the ethylene vinyl alcohol copolymer film with an aluminum vapor deposition layer. It was pasted so as to face the aluminum vapor deposition layer. Although a highly versatile linear low-density polyethylene film is used for the heat-welding layer, it is not particularly limited, and any film that can be heat-welded such as high-density polyethylene, polypropylene, or polybutylene terephthalate may be used. Here, a polyamide film or a polyethylene terephthalate film having excellent puncture resistance may be used for the surface layer.

  The laminate structure of the jacket material 53 is not particularly limited to the four-layer structure as long as it has the above-described characteristics, and may be five layers or three layers. Each layer is bonded by a dry laminating method via a two-component curable urethane adhesive, but the adhesive and the bonding method are not particularly limited thereto.

  For the inner bag 54, a heat-weldable polyethylene film was used in Example 1, and for the adsorbent (not shown), a physical adsorption type synthetic zeolite was used, but any material is not limited to this. The inner bag 54 may be a polypropylene film, a polyethylene terephthalate film, a polybutylene terephthalate film, or the like, as long as it has low hygroscopicity and can be thermally welded and has little outgas, and an adsorbent (not shown) can adsorb moisture and gas. For example, a physical adsorption type such as synthetic zeolite or silica gel having a different pore diameter, or a chemical reaction type adsorption type such as calcium oxide, calcium chloride, or strontium oxide can be used.

  For the core material 51, a fiber aggregate 51a obtained by fiberizing a polystyrene resin having a syndiotactic structure, a glass wool 51b that does not include a binder that is an inorganic fiber aggregate, and a fiber aggregate 51c that is formed by fiberizing an atactic polystyrene resin are appropriately used. What is necessary is just to use in combination. Specifically, in Example 1, as shown in FIG. 5, a fiber aggregate 51a of syndiotactic polystyrene and a fiber aggregate 51c of atactic polystyrene are used.

  Here, the syndiotactic structure is a structure in which the stereochemical structure has a three-dimensional structure in which phenyl groups that are side chains are alternately located in opposite directions with respect to the main chain formed from carbon-carbon bonds. Has a melting point of about 110 ° C. and a melting point of about 270 ° C. In addition, an atactic structure is generally this structure that is generally called polystyrene, and the phenyl group that is a side chain with respect to the main chain formed from a carbon-carbon bond is irregular (random). The softening temperature is generally around 80 ° C. The softening temperature referred to here represents the deflection temperature under load.

  The fiber assembly 51a is obtained by melting a polystyrene resin having a syndiotactic structure at 290 ° C. to obtain an average fiber thickness of 10 μm by a melt blown method. For the fiber assembly 51c, the polystyrene resin having an atactic structure is melted at 270 ° C. In the same manner, the fiber is averaged to 10 μm by the melt blown method. Of course, a virgin material can be used for the polystyrene resin, but a polystyrene resin having an atactic structure can also be used for a recycled material recovered from waste home appliances and other used products.

  The recycled material is preferably one that has been selected and washed after coarse pulverization, and is preferably in the form of pellets or finely pulverized to about 5 mm or less, but is not particularly limited thereto. The polystyrene resin having a syndiotactic structure is not limited to this, and an isotactic polystyrene can also be used. In addition, about the glass wool 51b, the thing with an average fiber diameter of 4 micrometers was used. In Example 1, the fiber assembly 51a is used with the fiber assembly 51c sandwiched so as to have the configuration of FIG. 1A, and the usage ratio is 4: 6 (see Example 1 shown in FIG. 5). .

  With these material configurations, the core material 51 is sufficiently dried at 70 to 90 ° C. and covered with the inner bag 54, and then compressed into a sealed state, inserted into the outer jacket material 53, and then the inner bag is sealed. Released and set in a vacuum packaging machine. Thereafter, the pressure was reduced from atmospheric pressure to a vacuum degree of 2.2 Pa at once, and after holding for a certain period of time at a vacuum degree of 2.2 Pa or less, the jacket material 53 was sealed. In addition, although the sealing release method of an inner bag is performed with a cutter, a squeeze, etc., it does not specify in particular. The heat conductivity of the vacuum heat insulating material thus obtained was measured with a heat conductivity measuring device Auto λHC-074 manufactured by Eihiro Seiki Co., Ltd., and the initial value was good at 1.9 to 2.1 (mW / m · K). A good value was obtained. As a result of verifying the thermal conductivity after a lapse of 10 years in an atmosphere at 70 ° C., a value of 10 to 11 (mW / m · K) was obtained. Even after 10 years, the results showed better heat insulation performance than glass wool or rigid urethane foam.

  In addition, assuming use in a refrigerator, a vacuum heat insulating material 50 is pasted on a steel plate outer box 21 as shown in FIG. 2, and a hard urethane foam 23 is filled between the inner box 22 of the refrigerator and a vacuum heat insulating material. 50 thermal insulation performance effects were verified. Since the rigid urethane foam 23 rises in the range of 70 to 100 ° C. due to its own reaction heat when filled, it may exceed the heat resistance temperature of general-purpose polystyrene resin. For this reason, it is possible that the vacuum heat insulating material 50 deform | transforms at the time of filling of the rigid urethane foam 23, or heat insulation performance deteriorates by generation | occurrence | production of the fusion | fusion etc. of fibers.

  In the vacuum heat insulating material 50 of the first embodiment, the surface temperature of the vacuum heat insulating material 50 temporarily increased to about 98 ° C. by filling the hard urethane foam 23, but the fiber assemblies 51 a and 51 c constituting the core material 51. There was no deformation. Moreover, when the vacuum heat insulating material 50 was taken out after foaming and the thermal conductivity was measured, it showed the same value as the initial performance, so it was confirmed that there was no influence of foaming heat.

  Moreover, although the above description was demonstrated based on the structure shown to (a) of FIG. 1, as shown in FIG.1 (b) as a structure of the vacuum heat insulating material 50, ie, the one side of the resin fiber aggregate 51c, ie, A configuration example in which the fiber aggregate 51a or 51b is arranged on the surface layer on the urethane foam 23 side may be employed. By making this vacuum heat insulating material 50 the same as the use example shown in FIG. 2, the resin fiber aggregate 51c is attached to the steel plate outer box 21 through the jacket material 53 without interposing the fiber aggregate 51a.

"Example 2"
In Example 2 which shows the structure of the vacuum heat insulating material 50 shown in FIG. 1, the fiber assembly 51b which made the fiber assembly 51a of the core material 51 of Example 1 into glass wool with an average fiber diameter of 4 micrometers which does not contain a binder, Except for the above, it is the same as Example 1, and is used with the fiber aggregate 51c sandwiched between the fiber aggregates 51b so as to have the configuration of FIG. See Example 2).

  With these material configurations, the fiber assembly 51c of the core material 51 was sufficiently dried at 70 to 90 ° C., and the fiber assembly 51b was sufficiently dried at 180 to 230 ° C. These fiber aggregates 51b and 51c are laminated and covered with an inner bag 54, and then compressed into a sealed state, inserted into the jacket material 53, the inner bag 54 is then unsealed, and vacuum packaged. Set in the machine. The reason for releasing the sealing of the inner bag 54 is to depressurize the inside of the inner bag 54.

  Thereafter, the pressure was reduced from atmospheric pressure to a vacuum degree of 2.2 Pa at a stroke, and the vacuum was maintained at a pressure of 2.2 Pa or less for a certain period of time. In addition, although the sealing release method of the inner bag 54 is performed by a cutter, a squeeze or the like, it is not particularly specified. The heat conductivity of the vacuum heat insulating material thus obtained was measured with a heat conductivity measuring device Auto λHC-074 manufactured by Eihiro Seiki Co., Ltd., which was good at 1.8 to 2.0 (mW / m · K) as an initial value. A good value was obtained. As a result of verifying the thermal conductivity after a lapse of 10 years in an atmosphere of 70 ° C., a value of 9 to 10 (mW / m · K) was obtained. Even after 10 years, the results showed better heat insulation performance than glass wool or rigid urethane foam.

  In addition, assuming use in a refrigerator, a vacuum heat insulating material 50 is attached to an outer box 21 made of a steel plate as shown in FIG. 2, and a rigid urethane foam 23 is filled between the inner box 22 of the refrigerator and vacuum insulation is performed. The heat insulation performance influence of the material 50 was verified in the same manner as in Example 1. In the vacuum heat insulating material 50 of the present Example 2, the surface temperature of the vacuum heat insulating material 50 temporarily increased to about 97 ° C. by filling the rigid urethane foam 23, but the fiber assemblies 51 b and 51 c constituting the core material 51 are There was no deformation. Moreover, when the vacuum heat insulating material 50 was taken out after foaming and the thermal conductivity was measured, it showed the same value as the initial performance, so it was confirmed that there was no influence of foaming heat.

"Example 3"
In Example 3 which shows the structure of the vacuum heat insulating material 50, it is the same except having set the usage ratio of the fiber assembly 51b and the fiber assembly 51c to 3: 7 in Example 2 ("Example 3 shown in FIG. 5"). ).

  When the thermal conductivity of the vacuum heat insulating material obtained in Example 3 was measured with Eihiro Seiki's thermal conductivity measuring device Auto λHC-074, the initial value was 1.9 to 2.2 (mW / m · K). Good values were obtained. As a result of verifying the thermal conductivity after a lapse of 10 years in a 70 ° C. atmosphere, a value of 11 to 12 (mW / m · K) was obtained. Even after 10 years, the results showed better heat insulation performance than glass wool or rigid urethane foam.

  In addition, assuming use in a refrigerator, a vacuum heat insulating material 50 is attached to an outer box 21 made of a steel plate as shown in FIG. 2, and a rigid urethane foam 23 is filled between the inner box 22 of the refrigerator and vacuum insulation is performed. The heat insulation performance influence of the material 50 was verified in the same manner as in Example 1. In the vacuum heat insulating material 50 of the present Example 2, the surface temperature of the vacuum heat insulating material 50 temporarily increased to about 97 ° C. by filling the rigid urethane foam 23, but the fiber assemblies 51 b and 51 c constituting the core material 51 are There was no deformation. Moreover, when the vacuum heat insulating material 50 was taken out after foaming and the thermal conductivity was measured, it showed the same value as the initial performance, so it was confirmed that there was no influence of foaming heat.

Example 4
Example 4 is the same as Example 2 except that the use ratio of the fiber assembly 51b and the fiber assembly 51c is 2: 8 (see “Example 4” shown in FIG. 5).

  When the thermal conductivity of the vacuum heat insulating material obtained in Example 4 was measured with a thermal conductivity measuring device Auto λHC-074 manufactured by Eihiro Seiki Co., Ltd., the initial value was 2.0 to 2.4 (mW / m · K). Good values were obtained. As a result of verifying the thermal conductivity after an elapse of 10 years in an atmosphere at 70 ° C., a value of 12 to 13 (mW / m · K) was obtained. Even after 10 years, the results showed better heat insulation performance than glass wool or rigid urethane foam.

  In addition, assuming use in a refrigerator, a vacuum heat insulating material 50 is attached to an outer box 21 made of a steel plate as shown in FIG. 2, and a rigid urethane foam 23 is filled between the inner box 22 of the refrigerator and vacuum insulation is performed. The heat insulation performance influence of the material 50 was verified in the same manner as in Example 1. In the vacuum heat insulating material 50 of the present Example 2, the surface temperature of the vacuum heat insulating material 50 temporarily increased to about 97 ° C. by filling the rigid urethane foam 23, but the fiber assemblies 51 b and 51 c constituting the core material 51 are There was no deformation. Moreover, when the vacuum heat insulating material 50 was taken out after foaming and the thermal conductivity was measured, it showed the same value as the initial performance, so it was confirmed that there was no influence of foaming heat.

"Comparative Example 1"
In Comparative Example 1 (see “Comparative Example 1” in FIG. 5) for comparison with the example of the vacuum heat insulating material according to the present embodiment, the use ratio of the fiber assembly 51 a and the fiber assembly 51 c in Example 1. Was set to 0:10. That is, all was the same as Example 1 except that only the fiber assembly 51c which is an atactic polystyrene resin was used (this is an example in which the fiber assembly 51a of the syndiotactic polystyrene of Example 1 is not used).

  When the thermal conductivity of the vacuum heat insulating material 50 obtained in Comparative Example 1 was measured with a thermal conductivity measuring device Auto λHC-074 manufactured by Eihiro Seiki Co., Ltd., the initial value was 2.0 to 2.4 (mW / m · K ) And good values were obtained. As a result of verifying the thermal conductivity after an elapse of 10 years in an atmosphere at 70 ° C., a value of 12 to 13 (mW / m · K) was obtained. Even after 10 years, the results showed better heat insulation performance than glass wool or rigid urethane foam.

  In addition, assuming use in a refrigerator, a vacuum heat insulating material 50 is attached to an outer box 21 made of a steel plate as shown in FIG. 2, and a rigid urethane foam 23 is filled between the inner box 22 of the refrigerator and vacuum insulation is performed. The heat insulation performance influence of the material 50 was verified in the same manner as in Example 1.

  In the vacuum heat insulating material 50 of the comparative example 1, the surface temperature of the vacuum heat insulating material 50 temporarily rises to about 97 ° C. by filling the rigid urethane foam 23, and the fiber aggregate 51 c constituting the core material 51 is softened. Warpage occurred. When the vacuum heat insulating material 50 was taken out and the thermal conductivity was measured, it was confirmed that the initial performance was deteriorated by about 30%. In addition, when the heat was not applied to the vacuum heat insulating material 50, good heat insulating performance was maintained.

"Comparative Example 2"
In Comparative Example 2, the use ratio of the fiber assembly 51b and the fiber assembly 51c in Example 2 was set to 10: 0 (see “Comparative Example 2” in FIG. 5). The fiber assembly 51b used here was the same as Example 2 except that glass wool was heated and pressed at 450 to 500 ° C. and formed to have a constant thickness.

  When the thermal conductivity of the vacuum heat insulating material 50 obtained in Comparative Example 2 was measured with a thermal conductivity measuring device Auto λHC-074 manufactured by Eihiro Seiki Co., Ltd., the initial value was 1.6 to 1.9 (mW / m · K ) And good values were obtained. As a result of verifying the thermal conductivity after a lapse of 10 years in an atmosphere at 70 ° C., the value was 7 to 10 (mW / m · K).

  In addition, assuming use in a refrigerator, a vacuum heat insulating material 50 is attached to an outer box 21 made of a steel plate as shown in FIG. 2, and a rigid urethane foam 23 is filled between the inner box 22 of the refrigerator and vacuum insulation is performed. The heat insulation performance influence of the material 50 was verified in the same manner as in Example 1.

  In the vacuum heat insulating material 50 of the comparative example 2, the surface temperature of the vacuum heat insulating material 50 temporarily rises to about 98 ° C. by filling the rigid urethane foam 23, and the fiber aggregate 51b constituting the core material 51 is deformed. There was no. Moreover, when the vacuum heat insulating material 50 was taken out after foaming and the thermal conductivity was measured, it showed the same value as the initial performance, so it was confirmed that there was no influence of foaming heat. However, this is a configuration in which the fiber assembly 51b is heated and pressed and the amount of heat energy consumed in the glass wool production stage is large.

  In FIG. 5, for Examples 1 to 4 and Comparative Examples 1 and 2 described above, the use ratio of the core material, the thermal conductivity of the vacuum heat insulating material, the deformation during urethane foaming, the energy consumption during production, Represents the numerical value or property. These numerical values and properties are as described above, and FIG. 5 collectively describes and describes the above-described contents.

Application example
Next, an application example in which the vacuum heat insulating material according to the embodiment of the present invention is applied to a refrigerator will be described. FIG. 3 is a front view of a refrigerator to which the above-described embodiment is applied, and FIG. 4 is a cross-sectional view taken along line AA in FIG.

  As shown in FIG. 4, the refrigerator 1 shown in FIG. 3 includes a refrigerator room 2, an ice storage room 3 (and a switching room), a freezer room 4, and a vegetable room 5 from the top. The code | symbol of FIG. 3 is a door which obstruct | occludes the front-surface opening part of each said chamber, All are drawer type except refrigeration room doors 6a and 6b and refrigeration room doors 6a and 6b which rotate centering on the hinge 10 grade | etc., From the top. The ice storage room door 7a, the upper freezer compartment door 7b, the lower freezer compartment door 8, and the vegetable compartment door 9 are arranged. When these drawer-type doors 6 to 9 are pulled out, the containers constituting each chamber are pulled out together with the doors. Each door 6-9 is provided with a packing 11 for sealing the refrigerator main body 1, and is attached to the indoor side outer periphery of each door 6-9.

  Moreover, the partition heat insulation wall 12 is arrange | positioned in order to carry out the partition heat insulation between the refrigerator compartment 2, the ice-making room 3a, and the upper stage freezer compartment 3b. The partition heat insulating wall 12 is a heat insulating wall having a thickness of about 30 to 50 mm, and is made of a single material or a combination of a plurality of heat insulating materials such as a styrofoam, a foam heat insulating material (urethane foam), and a vacuum heat insulating material. Since the temperature zone is the same between the ice making chamber 3a and the upper freezing chamber 3b and the lower freezing chamber 4, a partition member 13 having a packing 11 receiving surface is provided instead of a partition heat insulating wall for partition heat insulation. A partition heat insulation wall 14 is provided between the lower freezer compartment 4 and the vegetable compartment 5 to insulate the partition. Like the partition heat insulation wall 12, it is a heat insulation wall of about 30 to 50 mm, and this is also a styrofoam or foam heat insulation. Made of materials (urethane foam), vacuum insulation, etc. Basically, partition heat insulation walls are installed in partitions of rooms with different storage temperature zones such as refrigeration and freezing.

  In the box 20, storage compartments for the refrigerator compartment 2, the ice making compartment 3a and the upper freezer compartment 3b, the lower freezer compartment 4, and the vegetable compartment 5 are formed from above, respectively. The invention is not particularly limited to this. The refrigerator doors 6a and 6b, the ice making door 7a, the upper freezer compartment door 7b, the lower freezer compartment door 8 and the vegetable compartment door 9 are also particularly limited in terms of opening and closing by rotation, opening and closing by drawer, and the number of doors divided. is not.

  The box 20 includes an outer box 21 and an inner box 22, and a heat insulating part is provided in a space formed by the outer box 21 and the inner box 22 to insulate each storage chamber in the box 20 from the outside. Yes. A vacuum heat insulating material 50 is disposed on either the outer box 21 side or the inner box 22 side, and a space other than the vacuum heat insulating material 50 is filled with a foam heat insulating material 23 such as hard urethane foam.

  In addition, a refrigerator 28 is provided on the back side of the freezer compartments 3a and 4 in order to cool each room such as the refrigerator compartment 2, the freezer compartments 3a and 4 and the vegetable compartment 5 to a predetermined temperature. The refrigeration cycle is configured by connecting the cooler 28, the compressor 30, the condenser 30a, and a capillary tube (not shown). Above the cooler 28, a blower 27 that circulates the cool air cooled by the cooler 28 in the refrigerator and maintains a predetermined low temperature is disposed.

  Insulation partitions 12 and 14 are arranged as heat insulating materials for partitioning the refrigerator refrigerating chamber 2, ice making chamber 3a and upper freezing chamber 3b, freezing chamber 4 and vegetable chamber 5, respectively. It is configured. The heat insulating partitions 12 and 14 may be filled with a foam heat insulating material 23 such as rigid urethane foam, and are not particularly limited to the foamed polystyrene 33 and the vacuum heat insulating material 50.

  In addition, an interior lamp 45 having a case 45a protruding toward the heat insulating material 23 is arranged on a part of the top surface of the inner box 22 so that the interior when the refrigerator door is opened is bright and easy to see. is there. The interior lamp 45 is not particularly limited, such as a light bulb, a fluorescent lamp, or a xenon lamp. Since the thickness of the heat insulating material 23 between the case 45a and the outer box 21 becomes thin due to the arrangement of the interior lamp 45, the vacuum heat insulating material 50 is arranged to ensure the heat insulating performance. It is not specified that the interior lamp 45 is arranged in the illustrated position.

  Further, although not shown in FIG. 4, a heat radiating pipe is attached to the lower surface of the outer box 21 on the top surface side of the box 20. Then, in consideration of the occupation space by the interior lamp case 45a described above, the occupation space by the heat radiating pipe installed on the lower surface of the top surface side outer box 21 and the heat release effect, the case 45a and the top surface side of the outer case 21 Vacuum insulation is placed between them to ensure heat insulation performance.

  In addition, a concave portion 40 for accommodating an electrical component 41 such as a substrate for controlling the operation of the refrigerator 1 or a power supply substrate is formed in the rear portion of the top surface of the box 20, and a cover 42 that covers the electrical component 41. Is provided. The height of the cover 42 is arranged so as to be substantially the same height as the top surface of the outer box 21 in consideration of appearance design and securing the internal volume. Although it does not specifically limit, when the height of the cover 42 protrudes from the top | upper surface of an outer box, it is desirable to set it in the range within 10 mm. Along with this, the recess 40 is disposed in a state where only the space for housing the electrical component 41 is recessed on the heat insulating material 23 side, so that the internal volume is inevitably sacrificed in order to ensure the heat insulating thickness. If the internal volume is increased, the thickness of the heat insulating material 23 between the recess 40 and the inner box 22 will be reduced. For this reason, the vacuum heat insulating material 50 is arrange | positioned in the surface at the side of the heat insulating material 23 of the recessed part 40, and the heat insulation performance is ensured and strengthened.

  In the application example shown in FIG. 4, the vacuum heat insulating material 50 is a single vacuum heat insulating material 50 formed in a substantially Z shape so as to straddle the case 45 a of the interior lamp 45 and the electrical component 41. The cover 42 is made of a steel plate in consideration of a fire from the outside or a case where it is ignited for some reason.

  In addition, since the compressor 30 and the condenser 31 arranged at the lower back of the box 20 are components that generate a large amount of heat, in order to prevent heat from entering the inside of the box, a vacuum insulation is provided on the projection surface toward the inner box 22 side. The material 50 is arranged.

  As the vacuum heat insulating material 50 in this application example, the vacuum heat insulating material 50 of Example 2 described above was used. In this application example, the fiber assembly 51b is arranged on the high-temperature part side such as the concave part 40 in which the above-described heat-dissipating pipe and the electrical component 41 are arranged and the urethane heat insulating side so as not to be affected by heat. did.

  The arrangement portion is not particularly limited to this, and in order to suppress the heat generated from the compressor 30 and the condenser 31 from entering the inside of the warehouse, the compressor 30 and the condenser 31 toward the inner box 22 side. A vacuum heat insulating material 50 can also be disposed on the projection surface. In order to increase the covering area of the vacuum heat insulating material 50, it is possible to form a three-dimensional shape integrally formed from the bottom surface of the inner box 21 to between the compressor 30 and the cooler 28. In addition, about the shape of the vacuum heat insulating material 50 located between the compressor 30 and the cooler 28, the notch for escaping the drain pipe which is not shown in figure was provided. The presence or absence of a notch or its shape is not particularly limited.

As the vacuum heat insulating material 50 in this application example, a material in which the thickness of the core material 51 is set to 10 mm and the density of the core material 51 combining the fiber aggregates 51b and 51c is set to about 250 (kg / m ³ ) is used. By arranging the vacuum heat insulating material 50 on the top surface portion, it is possible to reduce the heat intrusion into the cabinet by the electric component 41 and the heat radiating pipe, further improve the heat radiation characteristics of the heat radiating pipe, and by arranging the vacuum heat insulating material 50 on the bottom surface. Since the heat generated from the compressor 30 and the condenser 31 can be prevented from entering the cabinet, the heat insulation performance can be improved without increasing the wall thickness.

  Summarizing the outline of the present invention, conventionally, a vacuum heat insulating material using a core material obtained by molding inorganic fibers such as glass wool by a binder or a heat press is excellent in heat insulating performance and contributes to energy saving of equipment. However, the energy consumed in the manufacturing process of the vacuum heat insulating material and the material constituting the vacuum heat insulating material is enormous, and there is a problem that environmental considerations are insufficient in terms of manufacturing. On the other hand, in the vacuum heat insulating material in which the core material is made of polyester fiber, the above problems can be solved to some extent, but the heat insulating performance is greatly inferior, and the development of a vacuum heat insulating material having both heat insulating performance and environmental considerations is an issue. It was.

    In order to solve this problem, in the present invention, in order to improve the heat insulation performance, by adopting a core material obtained by fiberizing a polystyrene resin having a large flexural modulus, the energy consumption during production is suppressed, and the heat insulation performance is reduced. It is possible to provide a vacuum heat insulating material that is good. In addition, since polystyrene resin has a low heat-resistant temperature, it should be a vacuum heat-insulating material that has both heat insulation performance and environmental consideration by combining (high) fiber materials with different softening temperatures so as not to be affected by heat during urethane foaming. It is something that can be done.

  Then, the vacuum heat insulating material which concerns on embodiment of this invention is equipped with the following specific structures, and there exists a function thru | or effect | action, It is characterized by the above-mentioned. That is, in a vacuum heat insulating material composed of at least a core material composed of a fiber assembly and a jacket material having gas barrier properties, the softening temperature of the fiber assembly disposed on the surface layer on one side or both sides of the core material, It is characterized by being higher than the softening temperature of the resin fiber assembly disposed in a portion other than the surface layer. By using the resin fiber aggregate as a part of the core material, it is possible to comprehensively reduce energy consumption at the time of production compared to conventional glass wool heat-press molded. Further, the fiber aggregate is a syndiotactic polystyrene resin, and the resin fiber aggregate is an atactic polystyrene resin.

  Further, the fiber aggregate is an inorganic material, and the resin fiber aggregate is a polystyrene resin. Examples of the inorganic material include glass fiber, ceramic fiber, glass wool, rock wool, and the like. However, the material is not particularly limited, but it is preferable to use glass wool containing no binder from the viewpoint of heat insulation performance. The polystyrene resin as the resin fiber aggregate is not particularly limited as long as it can be fiberized, and recycled materials recovered from waste home appliances and the like can also be used.

  Further, in the refrigerator provided with the heat insulating parts such as the compressor, the control board and the heat radiating pipe in the space formed by the outer box and the inner box, the foam heat insulating material and the vacuum heat insulating material are at least softened. Laminated fiber assemblies with different temperatures are covered with a jacket material having gas barrier properties, and the inside thereof is sealed under reduced pressure, and the core material has a higher softening temperature in contact with the foam insulation. It arrange | positions so that it may become the side and heat-emitting component side. The fiber aggregates having different softening temperatures are not particularly limited in material, such as a combination of resin fiber aggregates of the same type and different structure, or a combination of inorganic fiber aggregates and resin fiber aggregates. From the surface, a combination of glass wool and polystyrene fiber aggregate is preferred.

  Moreover, when Examples 2, 3, and 4 of the present invention are integrated, the core material of the vacuum heat insulating material is a glass fiber aggregate having an average fiber diameter of 2 to 6 μm and containing no binder component, and polystyrene having an average fiber diameter of 1 to 30 μm The resin fiber assembly has a sandwich structure, and the proportion of polystyrene fibers in the core material is 50 to 80%. Considering the heat insulation performance, it is better to use a higher percentage of glass wool, but from the viewpoint of controlling energy consumption, it is better to use a higher percentage of polystyrene fiber, and adjust the usage ratio according to the application and use site. It is preferable to do.

  Further, at least a fiberizing step for melting and fiberizing the resin material, a laminating step for laminating the fiberized materials (the resin fiber aggregate 51c shown in FIG. 1 is formed as a central layer, and the fiber aggregates 51b, A stacking process in which 51c is formed as a surface layer), a core material manufacturing process comprising a cutting process for cutting the stacked product into a product size, and a core material drying process for removing moisture and gas components adhering to and in the core material And a bag packing step of charging the dried core material into a bag-shaped outer covering material, and a vacuum packing step of sealing the inner portion of the outer covering material in a reduced pressure state.

  Thus, for the vacuum heat insulating material according to the embodiment of the present invention, conventionally, the polystyrene resin which has been difficult to arrange in the urethane foam heat insulating material such as the refrigerator and the high temperature part due to the heat resistant temperature is made into a fiber. In combination with a material with a high softening temperature, it enables vacuum insulation that can be used even in a temperature range that exceeds the softening temperature of polystyrene resin, and it also reduces the amount of energy consumed in the manufacturing process. Can be provided. In addition, the polystyrene resin used in this embodiment can be made from recycled materials, so it not only saves energy in the raw material manufacturing process, but also contributes significantly to saving resources, greatly reducing the environmental burden. It can be done.

  About the vacuum heat insulating material according to the present embodiment, in addition to the refrigerator, it is also widely used in high temperature baths, constant temperature baths, etc., in general cooling equipment, in addition to housing / buildings that can be expected to improve air conditioning efficiency, vehicle fields such as automobiles and trains, etc. Can be applied. In addition, for refrigerators to which the vacuum heat insulating material according to the present embodiment is applied, not only energy saving in the product life cycle but also reduction in environmental load can be realized by using a vacuum heat insulating material that can save energy from the manufacturing stage of the product. It is.

It is a figure which shows the structural example of the vacuum heat insulating material which concerns on embodiment of this invention. It is a figure which shows the usage example of the vacuum heat insulating material which concerns on this embodiment. It is a front view of the refrigerator which applied the vacuum heat insulating material which concerns on this embodiment. It is sectional drawing of the refrigerator to which the vacuum heat insulating material which concerns on this embodiment is applied, and is AA sectional view taken on the line of FIG. It is a figure showing the contrast with the some Example and comparative example which show the structure of the vacuum heat insulating material which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Refrigerating room 3a Ice making room 3b Upper freezing room 4 Lower freezing room 5 Vegetable room 6a Refrigerating room door 6b Refrigerating room door 7a Ice making room door 7b Upper freezing room door 8 Lower freezing room door 9 Vegetable room door 10 Door hinge 11 Packing 12, 14 Heat insulation partition 13 Partition member 20 Box body 21 Outer box 21a Top plate 21b Rear plate 22 Inner box 23 Heat insulating material 27 Blower 28 Cooler 30 Compressor 31 Condenser 33 Expanded polystyrene 40 Recess 41 Electrical component 42 Cover 45 Storage Internal light 45a Case 50 Vacuum heat insulating material 51 Core material 51a, 51b Fiber assembly 52c Resin fiber assembly 53 Outer material 54 Inner bag

Claims (5)

In a vacuum heat insulating material comprising a core material made of a fiber assembly and a jacket material having gas barrier properties,
The core material has a resin fiber assembly disposed in a central layer thereof, and a fiber assembly disposed in a surface layer on both sides of the resin fiber assembly,
The fiber aggregate of the surface layer is a material whose softening temperature is higher than the softening temperature of the resin fiber aggregate of the central layer,
The vacuum heat insulating material, wherein the fiber aggregate of the surface layer is a polystyrene resin having a syndiotactic structure, and the resin fiber aggregate of the central layer is a polystyrene resin having an atactic structure. In claim 1,
Instead of disposing fiber aggregates on the surface layers on both sides of the resin fiber aggregate , disposing a fiber aggregate that is a polystyrene resin having the syndiotactic structure on one surface layer of the resin fiber aggregate. Vacuum insulation material characterized by   A vacuum heat insulating material according to claim 1 is installed in a space formed by an outer box and an inner box together with a foam heat insulating material.   A vacuum heat insulating material according to claim 1 is installed together with a foam heat insulating material in a space facing a heat generating component including a compressor, a control or power supply board, and a heat radiating pipe. The fiber assembly which is the polystyrene resin of the said syndiotactic structure which the vacuum heat insulating material of Claim 2 was installed with the foam heat insulating material in the space formed by an outer box and an inner box, and arrange | positioned in the surface layer of the said one side A refrigerator, wherein the body is installed so as to abut against the foamed heat insulating material.

Images