JP4183657B2 - refrigerator - Google Patents

Description

The present invention relates to the refrigerator.

  In recent years, from the viewpoint of global warming, the necessity of reducing the power consumption of home appliances has been screamed. In particular, refrigerators are products that consume a large amount of power consumption among household electrical appliances, and reducing the power consumption of refrigerators is indispensable as a measure against global warming. If the load in the refrigerator is constant, the power consumption of the refrigerator is largely determined by the efficiency of the compressor for cooling the refrigerator and the heat insulation performance of the heat insulating material related to the amount of heat leakage from the refrigerator, In the refrigerator, it is important to improve the efficiency of the compressor and the performance of the heat insulating material.

  Therefore, in order to improve the performance of the heat insulating material, the use of a vacuum heat insulating material in a refrigerator has been performed. As a refrigerator using the conventional vacuum heat insulating material, there exists what was disclosed by Unexamined-Japanese-Patent No. 2001-165557 (patent document 1). The refrigerator of Patent Document 1 forms a vacuum heat insulating material in which a core material made of sheet-like inorganic fiber aggregates is covered with a jacket material made of a gas barrier film, and the inside thereof is sealed under reduced pressure. It is arranged in a space formed by the inner box and a heat insulating wall formed by filling a foam heat insulating material around the space.

  On the other hand, in order to recycle the heat insulating material of the refrigerator and effectively use resources, it is considered that the waste material of the foam heat insulating material is used as the vacuum heat insulating material. As a refrigerator using the vacuum heat insulating material of waste materials, there exists what was disclosed by Unexamined-Japanese-Patent No. 2001-349664 (patent document 2). The vacuum heat insulating material used in the refrigerator of Patent Document 2 is a finely pulverized waste foam heat insulating material using an airflow pulverization method pulverizer so that almost no closed cells remain, thereby creating a foam heat insulating powder having an open cell structure. A foamed heat insulating powder obtained by mixing a foamed heat insulating powder with a binder and placing the mixture in a mold and hot press molding is provided with a core material bonded via the binder.

JP 2001-165557 A

JP 2001-349664 A

  In the refrigerator of patent document 1, since the sheet-like inorganic fiber aggregate is used as the core material of the vacuum heat insulating material, it has an advantage that heat insulating performance and strength are excellent. However, Patent Document 1 does not disclose that the core material of the sheet-like inorganic fiber aggregate is formed using the waste core material, and there is a problem regarding effective use of resources.

  Moreover, in the refrigerator of patent document 2, since the foam insulation material of a waste material is made into a foam insulation powder as the core material of a vacuum insulation material, the heat insulation performance like a vacuum insulation material using the core material which consists of an inorganic fiber aggregate, and There was a problem that it was difficult to obtain strength. Further, Patent Document 2 does not disclose recycling the waste of the core material of the vacuum heat insulating material.

  Furthermore, the core material composed of the sheet-like inorganic fiber aggregate is often a laminate in which the sheet-like inorganic fiber aggregates are stacked in a plurality of layers and bonded with a binder, and the edges thereof are not aligned. For this reason, it was cut and not used as a core material. The cut end material has a long and narrow strip shape and is generally discarded without being reused. There is a problem in effectively using the end material.

  Therefore, it is conceivable that coarsely pulverized end materials of the inorganic fiber aggregates are sandwiched between the sheet-like inorganic fiber aggregates, a binder is supplied to these, and hot press molding is performed to obtain a vacuum heat insulating material. However, since the core material of the vacuum heat insulating material is hot-pressed together with the sheet-like inorganic fiber aggregate, there is a problem in that the pulverized materials are not sufficiently bonded to each other and become brittle in strength.

An object of the present invention is to provide an effective while achieving utilization excellent thermal insulation performance and strength strong refrigerators resources.

To achieve the pre-Symbol object, the present invention is to provided a housing the core material into the enveloping member vacuum thermal insulator sealed vacuum seal between the outer box and the inner box, said outer box In the refrigerator in which the space between the inner box and the foamed heat insulating material is filled to form a heat insulator, the core material is composed of an inorganic fiber aggregate between a plurality of sheet-like new inorganic fiber aggregates. with pulverized product obtained by pulverizing waste core material is laminated to sandwich the heat-pressed by waste inorganic fiber assembly in which the direction of the fibers are in collated and sheet with binder, these laminated inorganic fibers It is in a refrigerator characterized in that the assembly is composed of a laminate that is hot-pressed and bonded with a binder.

A more preferable specific configuration of the present invention is as follows.
(1) The waste material inorganic fiber aggregates formed into a sheet form have fiber directions aligned substantially in parallel .
(2) The said core material is comprised with the laminated body by which the said new material inorganic fiber assembly which does not contain a binding material, and the said waste material inorganic fiber assembly with which a binding material remains were laminated | stacked.

According to the present invention, it is possible to obtain an effective while achieving utilization excellent thermal insulation performance and strength strong refrigerators resources.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. The refrigerator in the present invention includes vending machines, merchandise display shelves, merchandise display cases, cool storage boxes, cooler boxes, refrigeration / freezer cars, etc., in addition to household and commercial refrigeration / freezers.

  The refrigerator and the vacuum heat insulating material of 1st Example of this invention are demonstrated using FIGS. 1-7.

  The overall configuration of the refrigerator of this embodiment and the manufacturing method thereof will be described with reference to FIGS. FIG. 1 is a perspective view of a refrigerator according to a first embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of an essential part of FIG.

  The refrigerator according to the present embodiment includes a heat insulating box 21 that forms a heat insulating body having a vacuum heat insulating material 50 and a heat insulating door that forms a heat insulating body having a vacuum heat insulating material. The heat insulation box 21 includes a metal outer box 22, a synthetic resin inner box 23, a plurality of vacuum heat insulating materials 50 disposed inside the outer box 22, and the outer box 22 and the inner box 23. And a foam heat insulating material 24 filled in. The vacuum heat insulating material 50 is installed in close contact with a predetermined position inside the outer box 22. Specifically, the vacuum heat insulating material 50 is installed in close contact with the ceiling, left and right side surfaces, the bottom surface, and the back surface of the outer box 22. By setting it as the heat insulation box 21 using the vacuum heat insulating material 50 which concerns, compared with the case where a heat insulating body is comprised only by the foam heat insulating material 24, the refrigerator with little heat leak amount and power consumption can be provided. . As the foam heat insulating material 24, for example, a hard urethane foam is used.

  Such a refrigerator is manufactured by filling the space between the outer box 22 and the inner box 23 with a foam heat insulating material after the vacuum heat insulating material 50 is disposed inside the outer box 22.

  The heat insulating box 21 is formed with a plurality of storage chambers whose front surfaces are open. These storage rooms are partitioned from the top in the order of the freezing room and the refrigerating room, and are cooled to a predetermined low temperature suitable for each by a cooler disposed in the storage. In addition, the wall thickness of the heat insulation box 21 is about 20 mm-50 mm.

  Although not shown, the heat insulating door is provided so as to open and close the front opening of each storage chamber. As with the heat insulation box 21, the heat insulation door is formed between a metal outer box, a synthetic resin inner box, a plurality of vacuum heat insulating materials disposed inside the outer box, and the outer box and the inner box. It consists of foam insulation material filled in. This vacuum heat insulating material is manufactured by the same manufacturing method as the vacuum heat insulating material 50 on the heat insulating box 21 side.

  Next, a basic configuration of the vacuum heat insulation panel 1 of the present embodiment will be described with reference to FIGS. FIG. 3 is a schematic sectional view of the vacuum heat insulation panel 1 shown in FIG.

  The vacuum heat insulating material 50 includes a core material 2, an adsorbing member 3, and an outer covering material 1 that houses the core material 2 and the adsorbing member 3 and is made of a gas barrier film. The vacuum heat insulating material 50 decompresses the inside of the jacket material 1 in a state where the core material 2 and the adsorbing member 3 covered with the packaging material are housed in the jacket material 1, and the peripheral portion of the jacket material 1 is removed. It is manufactured by heat sealing and sealing. The shape of the vacuum heat insulating material 50 is not specifically limited, The thing of various shapes and thickness is applicable according to the location and workability | operativity applied.

  The core material 2 is formed by laminating a sheet-like waste inorganic fiber aggregate 6 using a waste core material and a sheet-like new inorganic fiber aggregate 7, and these laminated inorganic fiber aggregates 6, 7 are It is composed of a laminate that is hot-pressed and bonded with a binder.

  One side of the jacket material 1 is a polyethylene terephthalate resin (PET) that has a good gas barrier property by interposing a metal deposition film in which a metal such as aluminum is deposited inside the nylon layer that is the outermost layer, or an aluminum that has a good gas barrier property. And an inner layer film such as high-density polyethylene resin or polyacrylonitrile resin that can be heat-welded. The opposite side of the jacket material 1 has a polyethylene terephthalate resin (PET) having a good gas barrier property by interposing a metal vapor deposition film on which a metal such as aluminum is deposited, and further, an ethylene- A heat-weldable inner layer film such as a vinyl alcohol copolymer film (EVOH), a high density polyethylene resin and a polyacrylonitrile resin is integrally formed. The above two kinds of laminated films are welded with a heat welding layer such as a high-density polyethylene resin or polyacrylonitrile resin as the innermost layer, and the jacket material 1 is formed as a bag or container for sealing the core material. .

  Next, the manufacturing method of the vacuum heat insulating material 50 of a present Example is demonstrated, referring FIGS. 4-7. FIG. 4 is a perspective view illustrating a state in which the core material 2 and the end material 4 are separated from the core material in the present embodiment, and FIG. 5 illustrates a process for producing the waste material inorganic fiber aggregate 6 from the end material 4 in the present embodiment. FIG. 6 is an explanatory view of a method for producing the core material 2A in this embodiment, and FIG. 7 is a cross-sectional view of the core material 2 and the adsorbent 3 of this embodiment stored in the jacket material 1.

  A new material inorganic fiber aggregate 7 is made into a sheet by collecting short glass fiber materials having an average fiber diameter of 3 to 4 μm. The new inorganic fiber aggregate 7 is produced as a new inorganic fiber aggregate without using a waste core material.

  On the other hand, the edge part of the core material produced previously is cut | disconnected for the reason that the ridgeline is not aligned, etc., and the end material 4 is removed as shown in FIG. The portion from which the end material 4 is removed becomes the core material 2. Since the core material from which the end material 4 is removed is configured by laminating inorganic fiber aggregates, the end material 4 is also configured by inorganic fiber aggregates. The end material 4 used in this embodiment is cut from the core material 2A manufactured in this embodiment (see FIG. 6B), but from an inorganic fiber assembly manufactured by other methods. It may be cut from the core material.

These end materials 4 are collected as shown in FIG. 5A and put into a coarse pulverizer, and the end material 4 is coarsely pulverized by this coarse pulverizer to obtain a pulverized product 5 shown in FIG. 5B. The pulverized product 5 is a coarsely pulverized fiber product that has been coarsely pulverized so that the fiber length remains to some extent, and the core material of this example has a shorter average fiber length than the new inorganic fiber aggregate 7, as will be described later. It will have the layer of the waste material inorganic fiber assembly 6. FIG.
The

  These pulverized products 5 are hot-pressed to form sheet-like waste inorganic fiber aggregates 6 as shown in FIG. That is, the pulverized product 5 is made to have a predetermined width and thickness, and is compressed so that the fiber is almost horizontal by impregnating with an appropriate amount of an aqueous boric acid solution as necessary and dewatering. As a result, as shown schematically in the enlarged view of FIG. 5 (d), the fibers 6a of the waste inorganic fiber aggregate 6 are aligned substantially horizontally, so that the heat insulation performance is improved while increasing the strength of the waste inorganic fiber aggregate 6. can do. Moreover, by using the sheet-like waste material inorganic fiber aggregate 6 in advance, the handling becomes extremely easy.

  Next, the waste material inorganic fiber aggregate 6 and the new material inorganic fiber aggregate 7 are laminated as shown in FIG. That is, the waste material inorganic fiber aggregates 6 are laminated so as to sandwich the two new material inorganic fiber aggregates 7. In addition, a plurality of waste material inorganic fiber aggregates 6 may be prepared and sandwiched between the new material inorganic fiber aggregates 7. When the thickness of the waste material inorganic fiber aggregates 6 needs to be increased, further increase It is effective in saving resources. In the present embodiment, the waste material inorganic fiber aggregate 6 is made into one layer, the amount of use thereof is set to an amount that is 1/3 of the entire core material, and the waste material is also composed of the new material inorganic fiber aggregate 7 in an amount of 1/3 each. The inorganic fiber assembly 6 is sandwiched. Since both the waste material inorganic fiber aggregate 6 and the new material inorganic fiber aggregate 7 are in sheet form, the laminating operation can be easily performed.

  The laminated body is impregnated with a binder and hot-pressed so that the laminated body is bonded via the binder and compressed to a predetermined thickness to produce the core material 2A. Specifically, an inorganic fiber that uses an aqueous solution of an inorganic or natural organic binder as a binder, impregnates the entire laminate in an appropriate amount, and removes moisture in the binder by hot pressing to constitute the laminate. Are bonded via a bonding material to produce the core material 2A. Since the waste material inorganic fiber aggregate 6 is formed in the form of a sheet in advance, the strength of the core material 2A is higher than that of a new material inorganic fiber aggregate 7 simply having a pulverized material interposed between them. Even if the amount of the aggregate 6 is increased, it can be made strong.

  Next, the end material 4 is removed from the core material 2 </ b> A by the same method as in FIG. 4, and the core material 2 is manufactured. Next, the core material 2 is housed in the jacket material 1 together with the adsorbent 3 as shown in FIG. 7 and held at a pressure of 2.0 Pa or less for a certain time using a vacuum packaging machine, and then sealed. The vacuum heat insulating material 50 is produced as shown in FIG.

  It was confirmed that the vacuum heat insulating material produced in this way has a surface smoothness of the jacket material 1 at a level equivalent to that of a conventional vacuum heat insulating material using only new inorganic fiber aggregates. Further, when the thermal conductivity of the vacuum heat insulating material was measured with a thermal conductivity measuring device Auto λHC-071 manufactured by Eiko Seiki Co., Ltd., a low value of 2.8 mW / m · K was obtained as an initial value.

  According to the present embodiment, it is possible to obtain a refrigerator, a vacuum heat insulating material, and a manufacturing method thereof using a vacuum heat insulating material that is excellent in heat insulating performance and strong in strength while effectively utilizing resources.

  Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a perspective view showing a state in which the end material is divided from the core material in the second embodiment of the present invention, and FIG. 9 is a perspective view for explaining a method for producing the core material in the second embodiment. The second embodiment is different from the first embodiment in the following points, and is basically the same as the first embodiment in other points.

  In 2nd Example, as shown in FIG. 8, the end material 4 isolate | separated from the core raw material is further isolate | separated into two upper and lower parts, and it is set as the separated end material 4a. A plurality of the separated end materials 4a are arranged on a plane so as not to have a gap in the horizontal direction to form a first layer end material aggregate 4b, and the end material aggregate 4b has a joint or a joint between the end materials. Another end material 4a is overlapped so as to be substantially parallel to the first layer end material so as to close the generated gap, thereby forming a second layer end material assembly 4c. The end material aggregates such as 4b and 4c are preferably laminated so as to have two or more layers from the viewpoint of forming the strength of the core material.

  Further, the end material aggregate 4d laminated in two layers is sandwiched between new material inorganic fiber aggregates 7, and this laminated body is heated and compressed by a hot press to remove moisture, thereby producing the core material 2A. The new material inorganic fiber aggregate 7 used here was one that was half the normal weight per unit area. As shown in FIG. 8, the core material 2 </ b> A is separated into the core material 2 and the end material 4.

  The core material 2 obtained by this manufacturing method has a strength that does not cause any problem in handling strength, and a level that can be applied to mass production is obtained. Further, according to the second embodiment, the end material assembly 4d can be easily made only by separating the end materials 4 into two and arranging them.

  Vacuum insulation obtained by inserting the core material 2 into a bag composed of the gas barrier outer covering material 1 together with the adsorbent 3 and holding it at 2.0 Pa or less for a certain period of time using a vacuum packaging machine. In the material, the joint between the end materials 6a appears slightly linearly on the surface of the outer skin material 1, but the surface smoothness is not much different from the vacuum heat insulating material by the conventional manufacturing method. When the thermal conductivity of this vacuum heat insulating material was measured with a thermal conductivity measuring device Auto λHC-071 manufactured by Eiko Seiki Co., Ltd., a low value of 2.4 mW / m · K was obtained as an initial value.

  Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 10 is a perspective view for explaining a core material manufacturing process in the third embodiment of the present invention. The third embodiment is different from the second embodiment in the following points, and is basically the same as the second embodiment in other points.

  In the third embodiment, a plurality of separated end members 4a are arranged on a plane so that there are no gaps in the horizontal direction to form a first layer end member assembly 4b, and a similar end member assembly is formed on the end member assembly 4b. The body 4c is rotated in the horizontal direction so as not to be parallel to the end material assembly 4b, preferably in a direction of 90 ° so as to close the joint between the end materials or the gap formed in the joint. Overlapping. In order to form the strength of the core material, the end material assemblies 4b and 4c are preferably laminated so as to have two or more layers in a cross-beam shape. In this third embodiment, the first-layer end material aggregate 4b and the second-layer end material aggregate 4c are laminated in a substantially parallel beam shape that is approximately 90 °, and sandwiched between the new material inorganic fiber aggregates 7, The laminated body is heated and compressed by a hot press to remove moisture and produce the core material 2A. The new material inorganic fiber aggregate 7 used here was one that was half the normal weight per unit area. The core material 2A is separated into the core material 2 and the end material 4 as in the second embodiment.

  The core material 2 obtained by this manufacturing method has higher handling strength than the second embodiment.

  Vacuum insulation obtained by inserting the core material 9 into a bag composed of the gas barrier outer covering material 1 together with the adsorbent 3 and holding it at a pressure of 2.0 Pa or less for a certain time using a vacuum packaging machine. In the same manner as in Example 1, the joints between the end materials 4a appear slightly linear on the surface of the outer skin material 1, but the surface smoothness is not much different from the vacuum heat insulating material by the conventional manufacturing method. When the thermal conductivity of the vacuum heat insulating material was measured with a thermal conductivity measuring device Auto λHC-071 manufactured by Eiko Seiki Co., Ltd., a low value of 2.2 mW / m · K was obtained as an initial value.

It is a perspective view of the refrigerator of 1st Example of this invention. It is a principal part cross-sectional schematic diagram of FIG. It is a cross-sectional schematic diagram of the single state of the vacuum heat insulation panel shown in FIG. It is a perspective view which shows the state which isolate | separated the core material and the end material from the core raw material in 1st Example. It is a figure explaining the process of producing a waste material inorganic fiber aggregate | assembly from the end material in 1st Example. It is explanatory drawing of the preparation methods of the core raw material in 1st Example. It is sectional drawing of the state which accommodated the core material 2 and the adsorbent 3 of 1st Example in the jacket material 1. FIG. It is a perspective view of the state which divided the end material from the core material in the manufacturing method of the refrigerator of the 2nd example of the present invention. It is a perspective view explaining the preparation methods of the core raw material in 2nd Example. It is a perspective view explaining the preparation process of the core raw material in 3rd Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cover material, 2 ... Core material, 2A ... Core material, 3 ... Adsorbent, 4 ... End material, 4a ... Divided end material, 4b, 4c, 4d ... End material aggregate, 5 ... Ground material, 6 ... Waste inorganic fiber aggregates, 6a ... fibers, 7 ... new inorganic fiber aggregates, 21 ... heat insulation box, 22 ... outer box, 23 ... inner box, 50 ... vacuum insulation.

Claims (3)

A vacuum heat insulating material housed in the outer cover material and sealed under reduced pressure is disposed between the outer box and the inner box, and a foam heat insulating material is provided in the space between the outer box and the inner box. In refrigerators that are filled to form insulation,
The core material is
Waste material in which a pulverized product obtained by pulverizing a waste core material composed of inorganic fiber aggregates is hot-pressed together with a binding material between a plurality of sheet-like new inorganic fiber aggregates so that the directions of the fibers are aligned and formed into a sheet shape While being sandwiched and laminated with inorganic fiber aggregates,
A refrigerator characterized by comprising a laminated body in which these laminated inorganic fiber aggregates are hot-pressed and bonded with a binder.   2. The refrigerator according to claim 1, wherein the waste inorganic fiber aggregate formed into a sheet shape has a fiber direction aligned substantially in parallel.   3. The refrigerator according to claim 1, wherein the core material includes a laminate in which the new material inorganic fiber aggregate that does not include a binder and the waste inorganic fiber aggregate in which the binder remains are laminated. A refrigerator characterized by being.

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