JP5455673B2 - 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 to which the vacuum heat insulating material is applied.

2. Description of the Related Art In recent years, electrical 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 and CO ₂ emission. In addition, in order to suppress all energy consumption from various raw materials to the product manufacturing process, energy saving is promoted by promoting recycling of raw materials and reducing fuel costs and electricity costs in the manufacturing process. .

  Moreover, in order to increase the sticking area of a vacuum heat insulating material and to improve heat insulation performance, the location using a vacuum heat insulating material may not necessarily be a plane. That is, when a vacuum heat insulating material is pasted on the surface having the irregularities or corners of the pasting portion, it is necessary to perform groove processing or bending processing along the pasting portion.

  The vacuum heat insulating material described in Patent Document 1 is held in the shape of the pasting portion by disposing a film-like deformation holding member capable of holding the shape on a core material made of a fiber assembly.

  Moreover, the vacuum heat insulating material of patent document 2 uses the open cell synthetic resin foam for the core material which consists of an inorganic or organic fiber, and after making it into a vacuum heat insulating material, it performs uneven | corrugated processing from the outer surface, and becomes the shape of a sticking part. It is to hold.

JP 2007-56972 A JP 2004-207306 A

  However, even if a groove or a bending process is performed on the vacuum heat insulating material, because of the springback that tries to return to the original shape by the restoring force, a gap is generated when the heat is applied to the application portion, and the heat insulation performance is deteriorated. Moreover, there exists a possibility that a sticking force may become weak and position shift may arise.

  In the vacuum heat insulating material described in Patent Document 1, the deformation holding member is a film made of a metal such as aluminum or a synthetic resin such as polyethylene terephthalate resin. For this reason, there existed a subject that heat conduction was carried out rather than the fiber assembly used for a core material, and heat insulation performance fell.

  Moreover, in order to hold | maintain a shape using a deformation | transformation holding member, it was necessary to provide between layers, and there existed a subject that workability | operativity was bad and cost raised.

  Next, in the vacuum heat insulating material described in Patent Document 2, the larger the uneven shape, the thicker the plate-like material made of the open cell synthetic resin foam used for the core material, and there is a problem that the heat insulating performance decreases. there were.

  In addition, if there is an open cell synthetic resin foam when vacuum packaging, there is a problem that it is difficult for air to escape from the air layer contained in the open cell synthetic resin foam, and it takes a long time for vacuum packaging.

  Then, in view of the said subject, an object of this invention is to provide the vacuum heat insulating material which improves surface smoothness, and has high heat insulation performance, and a refrigerator using the same.

In order to solve the above problems, a vacuum heat insulating material of the present invention includes a core material of a fiber assembly, an inner bag that stores the core material, and an outer jacket material that stores the inner bag, and a bent portion or In the vacuum heat insulating material having a groove portion, the core material has a resin fiber layer in the bent portion or the groove portion, and the resin fiber layer is heat-treated to maintain a bent shape or a groove shape, and the core material is the resin It is a multilayer of a fiber layer and an inorganic fiber layer, and the core material is characterized in that the bent portion or the groove portion is the resin fiber layer, and the straight portion is an inorganic fiber layer .

Further, the refrigerator of the present invention is a refrigerator including a vacuum heat insulating material and a foam heat insulating material between an inner box and an outer box, wherein the vacuum heat insulating material stores a core material of a fiber assembly and the core material. An inner bag and an outer jacket material that accommodates the inner bag, and has a bent portion or a groove portion, and the core material has a resin fiber layer in the bent portion or the groove portion, and the resin fiber layer. The bent shape or groove shape is maintained by heat treatment and disposed on the inner box surface or the outer box surface, the core material is a multilayer of the resin fiber layer and the inorganic fiber layer, and the core material is The bent portion or the groove portion is the resin fiber layer, and the straight portion is an inorganic fiber layer .

  ADVANTAGE OF THE INVENTION According to this invention, the vacuum heat insulating material which improves surface smoothness and has high heat insulation performance, and a refrigerator using the same can be provided.

It is a figure which shows the vacuum heat insulating material which concerns on one Embodiment of this invention. It is a figure which shows the state which bent the vacuum heat insulating material which concerns on one Embodiment of this invention. It is the figure which used the fused resin fiber for the bending part of the vacuum heat insulating material which concerns on one Embodiment of this invention. It is a figure which shows the usage example of the vacuum heat insulating material which concerns on one Embodiment of this invention. It is a front view of the refrigerator to which the vacuum heat insulating material which concerns on one Embodiment of this invention is applied. It is the sectional view on the AA line of FIG.

  Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a view showing a vacuum heat insulating material according to an embodiment of the present invention. FIG. 2 is a diagram showing a state where the vacuum heat insulating material according to the embodiment of the present invention is bent. FIG. 3 is a diagram in which a fused resin fiber is used for a bent portion of a vacuum heat insulating material according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a usage example of the vacuum heat insulating material according to the embodiment of the present invention. FIG. 5 is a front view of a refrigerator to which a vacuum heat insulating material according to an embodiment of the present invention is applied. 6 is a cross-sectional view taken along line AA in FIG.

  The structure of the vacuum heat insulating material 50 is such that a resin fiber layer 52a which is an organic fiber aggregate serving as a core material 51, a glass wool layer 52b which is an inorganic fiber aggregate and an adsorbent (not shown) are wrapped in an inner bag material 53, and gas barrier properties are obtained. It is vacuum-packed with a jacket material 54 having In this embodiment, polystyrene fibers are used as the resin fiber layer 52a of the core material 51. However, resin fibers such as polypropylene and polyethylene terephthalate can also be used.

  For the inner bag material 53, a polyethylene film is used, but a polypropylene film, a polyethylene terephthalate film, a polybutylene terephthalate film, or the like that has low hygroscopicity and can be heat-welded and has little outgas can also be used. As the adsorbent, a physical adsorption type synthetic zeolite is used, but any adsorbent that adsorbs moisture or gas may be used, and a chemical reaction type adsorbent such as silica gel, calcium oxide, calcium chloride, strontium oxide or the like can also be used.

  For the jacket material 54, 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 with an aluminum vapor deposition layer on an ethylene vinyl alcohol copolymer film. The layers were laminated so as to face the aluminum vapor deposition layer. The laminate structure of the jacket material 54 is a four-layer structure of the above material, but is not limited to the above structure as long as it is a polyamide film or a polyethylene terephthalate film having equivalent gas barrier properties, heat resistance, and piercing strength. .

  The vacuum heat insulating material 50 is obtained by providing a fused portion on the fiber of the resin fiber layer 52 a that becomes the core material 51. The resin fiber layer 52a is obtained by melting polystyrene resin at 290 ° C. and fiberizing it by a melt blown method. The fiber diameter is preferably 5 to 15 μm. Furthermore, it can use as a core material excellent in performance and handling property because a fiber diameter shall be 8-10 micrometers.

Example 1
FIG. 2 is an external view of the vacuum heat insulating material 50 according to the embodiment of the present invention. The resin fiber layer 52a which becomes the core material 51 of the vacuum heat insulating material 50 is bent and heat-treated to maintain the bent shape. In addition, polystyrene resin was melted at 290 ° C. and fiberized by a melt blown method, and fibers having a fiber diameter of 8 to 10 μm were used.

  In these configurations, the resin fiber layer 52a, the glass wool layer 52b (inorganic fiber layer) and the adsorbent that are the core material 51 are wrapped in the inner bag material 53, and set in a vacuum packaging machine with the outer jacket material 54 having gas barrier properties. The vacuum was reduced to 2.2 Pa, and after holding for a certain period of time at a vacuum of 2.2 Pa or less, the envelope material 54 was sealed to obtain a vacuum heat insulating material.

  The vacuum heat insulating material 50 thus obtained is bent and simultaneously heat-treated to fuse the fibers on the surface of the resin fiber layer 52a on the inner box 22 side or the outer box 21 side, thereby forming a bent shape. The retained vacuum heat insulating material can be obtained.

  As for the heat treatment, the bending jig is heated to 100 ° C., and the bending shape is heat-treated at the time of molding, so that the fibers on the inner box 22 side or the outer box 21 side of the resin fiber layer 52a, or the fibers on both surfaces are arranged. Fused. The heat treatment temperature needs to be changed according to the fiber type and fiber diameter used in the resin fiber layer 52a and the heat resistance temperature of the jacket material. In this embodiment, the heat resistance of the resin fiber layer 52a of polystyrene resin and the jacket material 54 is as follows. The temperature was adjusted to 100 ° C.

  The heat conductivity of the vacuum heat insulating material 50 obtained in this way was measured with a heat conductivity measuring machine Auto λHC-074 manufactured by Eihiro Seiki Co., Ltd. and found to be 2.1 to 2.4 mw / m · k, and the bending shape was Good values maintained were obtained.

(Example 2)
Next, Example 2 will be described with reference to FIG. In the second embodiment, as in the first embodiment, a resin fiber layer that has been bent and heat-treated is used for the bent portion of the core material 51 of the vacuum heat insulating material 50, and the straight portion is a glass wool layer 52b ( Inorganic fiber layer). In addition, a polystyrene resin was melted at 290 ° C. to be fiberized by a melt blown method, and a resin fiber layer having a fiber diameter of 8 to 10 μm was bent into a bent shape and simultaneously heat-treated.

  Thereby, the fused resin fiber layer 52c having a bent shape can be obtained. Compared with Example 1, although it takes time and effort to combine the fused resin fiber layer 52c and the glass wool layer 52b (inorganic fiber layer) that maintain the bent shape, it does not perform heat processing after obtaining the vacuum heat insulating material. Less likely to decline. In addition, when heat processing is performed after obtaining the vacuum heat insulating material, since heat processing can be performed only at a temperature lower than the heat resistant temperature of the covering material 54, the fusion temperature may be increased depending on the type used for the resin fiber layer 52a. If the temperature is higher than the heat resistance temperature of the workpiece 54, it cannot be fused. With these configurations, the fused resin fiber layer 52c, the glass wool layer 52b (inorganic fiber layer), and the adsorbent, which become the core material 51, are wrapped in the inner bag material 53, and set in the vacuum packaging machine with the outer cover material 54 having gas barrier properties. The vacuum was reduced to 2.2 Pa, and after holding for a certain period of time at a vacuum of 2.2 Pa or less, the jacket material 54 was sealed to obtain a vacuum heat insulating material. The heat conductivity of the vacuum heat insulating material obtained in this way was measured with a heat conductivity measuring device Auto λHC-074 manufactured by Eihiro Seiki Co., Ltd. and found to be 1.9 to 2.1 mw / m · k, and the bending shape was maintained. Good values were obtained.

(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 with reference to FIGS. 4, 5, and 6. 4 to 6 show examples in which the vacuum heat insulating material in the form of Example 1 is applied.

  As shown in FIG. 4, the vacuum heat insulating material 50 is stuck on the outer box 21 made of steel plate, and the vacuum heat insulating material 50 is installed by filling the heat insulating material 23 of hard urethane foam between the inner box 22 of the refrigerator. .

  As shown in FIG. 6, the refrigerator 1 shown in FIG. 5 includes a refrigerator room 2, an ice making room 3 a, an upper freezer room 3 b, a lower freezer room 4, and a vegetable room 5 from the top. In the following description, the ice making chamber 3 a, the upper freezing chamber 3 b, and the lower freezing chamber 4 may be collectively referred to as the freezing temperature zone 3.

  In FIG. 5, each storage chamber has a front opening, and a door for closing the front opening is provided. The refrigerator compartment 2 is provided with refrigerator compartment doors 6a and 6b that rotate around the hinge 10 and the like. Except for the refrigerator compartment doors 6a and 6b, they are drawer type doors, and an ice making compartment door 7a, an upper freezer compartment door 7b, a lower freezer compartment door 8, and a vegetable compartment door 9 are arranged. When these drawer doors are pulled out, the storage containers provided in the respective storage chambers are pulled out together. Moreover, the packing 11 for closely adhering to a refrigerator main body and sealing a front opening is attached to the indoor side outer periphery of each door.

  In addition, a heat insulating partition 12 is disposed to insulate the compartment between the refrigerator compartment 2, the ice making chamber 3a, and the upper freezer compartment 3b. This heat insulating partition 12 is a heat insulating wall having a thickness of about 30 to 50 mm, and is made of foamed polystyrene, foam heat insulating material (foamed urethane), vacuum heat insulating material, etc., each of which is used alone or in combination with a plurality of heat insulating materials. Is provided. Since the temperature zones are 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. Between the lower freezer compartment 4 and the vegetable compartment 5, a heat insulating partition 14 is provided to insulate the compartment, and similarly to the heat insulating partition 12, a heat insulating wall of about 30 to 50 mm, and similarly foamed polystyrene or foam heat insulating material. (Urethane foam), vacuum insulation, etc. That is, the partition heat insulation wall is installed in the partition of rooms with different storage temperature zones, such as refrigeration and freezing.

  In addition, although the storage room of the refrigerator compartment 2, the ice-making room 3a, the upper stage freezer compartment 3b, the lower stage freezer compartment 4, and the vegetable compartment 5 is each dividedly formed in the box 20, the arrangement | positioning of each storage room is carried out. The invention is not particularly limited to this. Further, 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 divided doors. It is not a thing.

  Next, the box 20 includes an outer box 21 and an inner box 22. In a space formed by the outer box 21 and the inner box 22, a heat insulating portion is provided to insulate each storage chamber in the box 20 from the outside. A vacuum heat insulating material 50 is disposed between the outer box 21 and the inner box 22, and a space other than the vacuum heat insulating material 50 is filled with the heat insulating material 23. The vacuum heat insulating material 50 is arrange | positioned so that the resin fiber layer 52a may be located in the sticking surface side to the outer box 21 or the inner box 22. FIG. Thereby, since a surface with high planar smoothness contacts outer box 21 or inner box 22, appearance design nature can be improved. Moreover, sticking property improves and it can improve reliability.

  Moreover, when applying the vacuum heat insulating material of Example 2, the fused resin fiber layer 52c is located in the bending part of a core material. Thereby, since the planar smoothness of a bending part is high and it draws a curved surface smoothly and touches the outer box 21 or the inner box 22, it can improve external appearance design property. Moreover, the sticking property to the corner | angular part or uneven | corrugated | grooved part of the outer box 21 or the inner box 22 improves, and it can improve reliability.

  In addition, a cooler 28 is provided on the back side of the freezing temperature zone 3 in order to cool each room such as the refrigerator compartment 2, the freezing temperature zone 3, and the vegetable room 5 of the refrigerator 1 to a predetermined temperature. . A refrigeration cycle is configured by connecting the cooler 28, the compressor 30, the condenser 31, 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 1 and maintains a predetermined low temperature is disposed. Moreover, the heat insulation partitions 12 and 14 are each arrange | positioned as a heat insulating material which partitions the refrigerator compartment 2 and the freezing temperature zone room 3 of the refrigerator 1, and the freezing temperature zone room 3 and the vegetable compartment 5, respectively. The heat insulation partitions 12 and 14 are the structures by which the expanded polystyrene 33 and the vacuum heat insulating material 50 are arrange | positioned inside. The heat insulating partitions 12 and 14 may be filled with a urethane foam heat insulating material 23 as long as the desired heat insulating performance is exhibited, and is 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 occupied space by the interior lamp case 45a and the occupied space by the heat radiating pipe disposed on the lower surface of the top surface side outer box 21 and the effect of heat release, the case 45a and the top surface side of the outer box 21 A heat insulating performance is secured by placing a vacuum heat insulating material between them.

  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 keep 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. 6, 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 heat resistance.

  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 1 described above was used. In this application example, the resin fiber layer 52a is disposed on the high-temperature portion side such as the concave portion 40 in which the heat-dissipating pipe (not shown) and the electrical component 41 are disposed 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 22 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, the core material 51 having an overall thickness of 10 mm and a density of about 250 (kg / m ³ ) was 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.

  The outline of the embodiment of the present invention is summarized as follows.

  Conventionally, vacuum heat insulating materials using a core material of inorganic fibers such as glass wool are superior in terms of heat insulating performance, but when used as a vacuum heat insulating material, irregularities are generated on the surface, and gaps are created between them and pasting members. There was a problem of heat leaking from. The above problem can be solved to some extent by using a core material formed with a binder or hot press to improve the surface properties, but the energy consumed in the manufacturing process increases, and environmental considerations are insufficient in terms of manufacturing. There was a problem of being.

  In order to solve this problem, the present embodiment has the configuration as described above and has the following effects. That is, by providing a fiber fusion part in the organic fiber assembly, the rigidity of the fiber is increased when it is used as a vacuum heat insulating material, surface irregularities are reduced, and surface smoothness is improved. When the materials are pasted together, it is possible to provide a refrigerator-freezer having high heat insulation performance with less heat leakage by reducing the gap between the vacuum heat insulating material and the pasting member.

  As described above, in the vacuum heat insulating material, by using a groove or a bending process on the organic fiber, the organic fiber aggregate is held in a shape by heat treatment, so that a force to repel or return to the original shape (spring back force) is obtained. Even if it works, the groove or bending shape can be maintained, and by reducing the gap when pasted on the two sides with the unevenness and corners of the pasting part, the heat leak decreases and the refrigerator with high heat insulation performance Can be provided.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Refrigerated room 3a Ice making room 3b Upper stage freezer room 4 Lower stage freezer room 5 Vegetable room 12, 14 Heat insulation partition 13 Partition member 20 Box body 21 Outer box 22 Inner box 23 Heat insulation material 50 Vacuum heat insulation material 51 Core material 52a Resin fiber layer 52b Glass wool layer 52c Fusion resin fiber layer 53 Inner bag material 54 Jacket material

Claims (2)

In a vacuum heat insulating material comprising a core material of a fiber assembly, an inner bag for storing the core material, and an outer jacket material for storing the inner bag, and having a bent portion or a groove portion,
The core material has a resin fiber layer in the bent portion or the groove portion, and heat-treats the resin fiber layer to maintain a bent shape or a groove shape ,
The core material is a multilayer of the resin fiber layer and the inorganic fiber layer,
The vacuum heat insulating material, wherein the core material has the bent portion or the groove portion as the resin fiber layer and the straight portion as an inorganic fiber layer . In the refrigerator provided with a vacuum heat insulating material and a foam heat insulating material between the inner box and the outer box,
The vacuum heat insulating material includes a core material of a fiber assembly, an inner bag that stores the core material, and an outer jacket material that stores the inner bag, and has a bent portion or a groove portion,
The core material has a resin fiber layer in the bent portion or the groove portion, and heat-treats the resin fiber layer to hold a bent shape or a groove shape, and is disposed on the inner box surface or the outer box surface ,
The core material is a multilayer of the resin fiber layer and the inorganic fiber layer,
The refrigerator is characterized in that the core material has the bent part or the groove part as the resin fiber layer and the straight part as an inorganic fiber layer .

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