Vacuum heat insulation material, method for manufacturing vacuum heat insulation material, and refrigerator

Abstract

The invention provides a vacuum heat insulation material, a method for manufacturing the vacuum heat insulation material, and a refrigerator, even if air leakage occurs in the vacuum heat insulation material, the restoring force of a core material which is not mixed with an adhesive can be kept low, and the occurrence of glass peeling of a glass plate from a door frame can be inhibited. The vacuum heat insulation material at least comprises: a laminated core material (75) formed by laminating a plurality of heat-treated unit core materials (71E) obtained by thermally pressurizing a flat plate-shaped core material (71D) that does not use an adhesive; and an outer cover material (74) which accommodates the laminated core material (75) and has a reduced internal space. As a result, the restoring force of the unit core material after each heat treatment is suppressed to be low, and as a result, the restoring force of the laminated core material is also suppressed to be low, and the occurrence of glass peeling can be suppressed.

Description

Technical Field

[0001] This invention relates to vacuum insulation components, methods for manufacturing vacuum insulation components, and cold storage facilities. Background Technology

[0002] In recent cold storage facilities, glass panels have been installed on the exterior surfaces of rotating doors (double doors), sliding doors, and the like, facing the insulation door, to enhance design aesthetics. Furthermore, as insulation material installed on the insulation door, a structure is employed in which vacuum insulation components containing inorganic fibers such as glass fiber are disposed on the back of the glass panel.

[0003] For example, Japanese Patent Application Publication No. 2020-118404 (Patent Document 1) discloses a door insulation panel, which includes: a glass plate disposed on the outer surface; a door frame disposed on the periphery of the glass plate; and a vacuum insulation member disposed on the back side of the glass plate, wherein the periphery of the back side of the glass plate is joined to the door frame using a hot melt adhesive and adhesive tape (double-sided adhesive tape).

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2020-118404 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] As described above, in a cold storage facility as represented in Patent Document 1, the door frame and the periphery of the glass panel are joined using bonding materials such as hot melt adhesives and adhesive tapes. Furthermore, to improve thermal insulation, vacuum insulation components use materials in which no adhesive is mixed into the core material (inorganic fibers). If an adhesive is mixed in, the thermal insulation performance decreases; therefore, adhesive is not mixed in to improve thermal insulation.

[0009] Therefore, if the outer casing of the vacuum insulation component is damaged, or if air leakage occurs within the vacuum insulation component for some reason, the glass panel may be squeezed out of the door frame due to the restoring force of the core material (inorganic fibers) (the force by which the core material attempts to return to its pre-vacuum state due to air leakage), potentially leading to "glass peeling". In particular, since there is no adhesive in the core material, the restoring force of the core material is greater (this phenomenon will be explained again in the "Detailed Implementation" section).

[0010] That is, when the restoring force of the core material of the vacuum insulation component is greater than the bonding force that holds the glass panel to the door frame, the glass panel may sometimes peel off from the door frame. Therefore, from the perspective of product reliability, countermeasures to deal with glass peeling are also required.

[0011] The purpose of this invention is to provide a vacuum insulation component, a method for manufacturing a vacuum insulation component, and a cold storage, which can suppress the resilience of the unmixed adhesive core material even in the event of air leakage in the vacuum insulation component, thereby suppressing glass peeling phenomena that cause the glass panel to detach from the door frame.

[0012] Technical solutions for solving the problem

[0013] The vacuum insulation component of the present invention is characterized in that it comprises at least: a laminated core material, which is formed by laminating multiple units of processed core material obtained by hot-pressing a flat core material composed of inorganic fibers without adhesive; and an outer casing that houses the laminated core material and whose internal space is depressurized.

[0014] Invention Effects

[0015] According to the present invention, even in the event of air leakage in the vacuum insulation component, the restorative force of the unmixed adhesive core material can be suppressed to a low level, thereby suppressing glass peeling from the door frame. Attached Figure Description

[0016] Figure 1 This is a 3D view of the top of the cold storage.

[0017] Figure 2 yes Figure 1 The image shows a front view of the cold storage facility.

[0018] Figure 3 It means Figure 2 A cross-sectional view of the section in the AA direction of view.

[0019] Figure 4 This is an exploded perspective view of a rotary opening and closing door that applies the present invention.

[0020] Figure 5 It means Figure 4 A cross-sectional view of the section in the BB direction of view.

[0021] Figure 6 This is an explanatory diagram illustrating the manufacturing method of existing vacuum insulation components.

[0022] Figure 7 This is an illustration showing the glass peeling caused by existing vacuum insulation components.

[0023] Figure 8 This is an explanatory diagram illustrating a method for manufacturing a vacuum insulation component as an embodiment of the present invention.

[0024] Figure 9 This is an explanatory diagram illustrating how a vacuum insulation component according to an embodiment of the present invention suppresses glass peeling.

[0025] Figure 10 These are explanatory diagrams illustrating the specifications and effects of embodiments and comparative examples of the present invention.

[0026] Figure 11 This is an explanatory diagram illustrating the relationship between the recovery force of the vacuum insulation component according to an embodiment of the present invention and that of a conventional vacuum insulation component.

[0027] Figure 12 This is a cross-sectional view showing the first structure of the heat insulation door when the vacuum heat insulation component of the embodiment of the present invention is installed on a glass plate.

[0028] Figure 13 This is a cross-sectional view showing the second structure of the insulation door when the vacuum insulation component of the embodiment of the present invention is installed on a glass plate. Detailed Implementation

[0029] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments, and various modifications and applications are also included in the technical concept of the present invention.

[0030] First, the structure of the cold storage facility using the present invention will be described. Figure 1 This is a perspective view of a cold storage 100 according to an embodiment of the present invention. Figure 2 yes Figure 1 The front view of the cold storage 100 shown.

[0031] like Figure 1 , Figure 2 As shown, the cold storage 100 according to an embodiment of the present invention includes a housing 20 and an insulated door 10 installed on the housing 20. In this embodiment, the insulated door 10 is composed of a plurality of insulated doors 1 to 6. That is, the insulated door 10 is used as a general term for insulated doors 1 to 6. The outer casing 21 includes a top panel 22 and a back panel (see reference 23). Figure 3 ), bottom panel (refer to) Figure 3 ), left side panel (not shown) and right side panel 25. In addition, door 1 and door 2 are rotatably supported by hinge 36.

[0032] Figure 3 It means Figure 2 The diagram shows a cross-sectional view of section AA of the cold storage facility. Figure 3 As shown, the cold storage 100 serves as a storage room, comprising, from top to bottom, a cold storage room 11, an ice-making room 12, an upper freezer room 13, a lower freezer room 14, and a vegetable compartment 15. Insulating doors 1-6 are doors that open and close the openings formed on the front surface of each storage room.

[0033] like Figure 2 , Figure 3As shown, insulated doors 1 and 2 are rotating insulated doors that rotate around hinge 36, while insulated doors 3 to 6 are drawer-type insulated doors. When the drawer-type insulated doors 3 to 6 are pulled out, the containers that make up each compartment are pulled out together with the insulated door.

[0034] Insulation doors 1 and 2 are for the refrigerator compartment 11; insulation door 3 is for the ice-making compartment 12; insulation door 4 is for the upper freezer compartment 13; insulation door 5 is for the lower freezer compartment 14; and insulation door 6 is for the vegetable compartment 15. Each insulation door 1-6 includes a sealing gasket 37 for sealing the cold storage 100 (see reference). Figure 3 Sealing gasket 37 is installed on the outer perimeter of the indoor side of each insulation door 1 to 6.

[0035] like Figure 3 As shown, each of the insulation doors 1-6 has an outer surface portion 31 facing outwards and an inner sidewall portion 32 facing inwards. In this embodiment, a vacuum insulation element 50 is disposed inside each of the insulation doors 1-6, between the outer surface portion 31 and the inner sidewall portion 32, as a heat insulation material. The vacuum insulation element 50 includes a core material having inorganic fibers (hereinafter referred to as glass fiber) and an outer casing covering the core material, and the interior is depressurized by evacuation.

[0036] In addition, the space inside each insulation door 1 to 6, excluding the vacuum insulation material 50, is filled with rigid polyurethane foam or other foam insulation components 33. Details about the vacuum insulation component 50 will be described later.

[0037] In addition, a partition wall 16 is provided to separate and insulate the refrigerator compartment 11 from the ice-making compartment 12 and the upper freezer compartment 13. Since the ice-making compartment 12 and the upper freezer compartment 13 and the lower freezer compartment 14 have the same temperature zone, a partition member 17 forming a bearing surface of the sealing gasket 37 is provided instead of a partition wall for separation and insulation.

[0038] A partition wall 18 is provided between the lower freezer compartment 14 and the vegetable compartment 15 for separation and heat insulation. Furthermore, the arrangement of the storage compartments within the cabinet 20 is not particularly limited to the above-described configuration. Additionally, there are no particular limitations on the type of opening and closing mechanism (rotation-based, pull-out-based, or the number of compartments) of the insulated doors 1-6.

[0039] The enclosure 20 includes an outer casing 21 made of steel plate and an inner casing 27 made of synthetic resin. An insulation layer is provided in the space formed by the outer casing 21 and the inner casing 27 to insulate the storage compartments inside the enclosure 20 from the outside. The outer casing 21 includes a top panel 22, a back panel 23, a bottom panel 24, a left side panel (not shown), and a right side panel 25 (see reference). Figure 1 ).

[0040] A vacuum insulation component 50 is disposed in the space between the outer casing 21 and the inner casing 27, and the space outside the vacuum insulation component 50 is filled with a foam insulation component 34 such as rigid polyurethane foam. In addition, the partition insulation walls 16 and 18 are composed of expanded polystyrene 35 and vacuum insulation component 50, but are not limited to this, and can also be composed of foam insulation components such as rigid polyurethane foam.

[0041] A refrigeration unit 44 is installed on the back side of the lower freezer compartment 14 to cool each storage compartment of the cold storage 100 to a specified temperature. The refrigeration unit 44, compressor 45, condenser 46, and capillary tube (not shown) are connected to form a refrigeration cycle. A blower 43 is installed above the refrigeration unit 44, which circulates the cooled air within the cold storage 100 to maintain the specified low temperature.

[0042] A recess 40 is formed at the rear of the top panel 22 of the housing 20 for housing electrical components 41, such as the base plate and power supply base plate used to control the operation of the cold storage 100, and a cover 42 is provided to cover the electrical components 41. Considering the appearance design and ensuring the internal volume, the height of the cover 42 is set to be approximately the same as the top surface of the outer housing 21.

[0043] Next, use Figure 4 , Figure 5 The structure between the exterior surface 31 of the insulation door and the vacuum insulation component 50 will be described. Additionally, Figure 4 The insulation door shown represents the rotating insulation door 1 of the refrigerator compartment 11 for opening and closing. Figure 4 This is an exploded perspective view of a rotating insulated door 1. Figure 5 This is a cross-sectional view of a rotating insulated door 1.

[0044] exist Figure 4 The insulated door 1 is configured to include: a rectangular outer panel (hereinafter referred to as a glass panel) 60, for example made of glass, disposed on the surface of the exterior face 31 of the insulated door 1; a door frame 61 disposed around the periphery of the glass panel 60 (four on each side); a vacuum insulation member 50 disposed on the back of the glass panel 60; and a foam insulation member 33 (see reference 1) filled with the vacuum insulation member 50 in a storage space 62 surrounded by the glass panel 60 and the door frame 61 on the front and sides. Figure 3 ); and the inner wall portion 32 located on the back (rear surface) of the door frame 61 and covering the rear of the storage space 62.

[0045] The glass panel 60 is formed of a rectangular flat plate of glass that forms the outer wall (outer contour, appearance surface) of the front (front surface) side of the door frame 1. The outer periphery of the glass panel 60 is mounted to the inner front end of a four-sided frame-like door frame 61 along the longer side of the glass panel 60, and is surrounded by the door frame 61. The glass panel 60 is preferably a flat plate material made of tempered glass, but it may also be made of a flat plate material such as plastic or ceramic instead of glass. Therefore, it is sometimes referred to as "outer panel" instead of glass.

[0046] The door frame 61 is composed of a frame member 63 formed along the right edge of the glass plate 60, a frame member 64 formed along the left edge of the glass plate 60, a frame member 65 formed along the upper edge of the glass plate 60, and a frame member 66 formed along the lower edge of the glass plate 60. The door frame 61 is formed, for example, from ABS (acrylonitrile-butadiene-styrene copolymer) resin or PP (polypropylene) resin.

[0047] One or more of frame members 63 to 66, such as frame member 63, frame member 65, and frame member 66, are provided with engaging grooves 63a, 65a, and 66a that engage with the right side edge, upper side edge, and lower side edge of the glass plate 60, respectively. These engaging grooves are formed by recessed grooves into which the outer periphery of the glass plate 60 is inserted (forming an abutment or covering structure).

[0048] In one or more of the frame members 63 to 66, such as frame member 64, a flange (edge) 64a is formed that is joined to the left edge of the glass plate 60 by adhesive tape and hot melt.

[0049] Alternatively, one or more of the frame members 63, 65, and 66, or all of them, can be configured as a flange 64a. In this case, the outer periphery of the glass plate 60 is joined to the flange of the frame members 63, 65, and 66 using adhesive tape or hot melt adhesive.

[0050] like Figure 5 As shown, the frame member 64 has a plate-shaped main body 64b extending toward the inner sidewall 32, and a flange 64a extending from the main body 64b substantially parallel to and substantially orthogonal to the surface of the glass plate 10. The flange 64a is located approximately at the end of the front side of the frame member 64.

[0051] Additionally, reinforcing ribs 64c, 64c extending parallel to the flange portion 64a are formed in the main body portion 64b. The reinforcing ribs 64c function as reinforcements for the frame member 64 and improve the bonding strength between the frame member 64 and the foam insulation member 33.

[0052] In this embodiment, only the case where at least a portion of the four sides of the glass plate 60, i.e. one side (left side), is joined by a joint 67 such as adhesive tape or hot melt is described. However, as described above, it is not limited to one side, and may also include multiple or all sides, including two or more sides.

[0053] The inner wall portion 32 is a resin (ABS resin or similar) panel component installed on the storage compartment side of the door frame 1. Furthermore, the inner wall portion 32 is fixed to the periphery of the back side of the door frame 61.

[0054] Furthermore, a sealing gasket fixing portion 78 is formed at the outer peripheral end of the inner wall portion 32 on the opposite side of the glass plate 60. A rectangular annular rubber sealing gasket is installed in the sealing gasket fixing portion 78 to prevent cold air leakage from the refrigerator compartment.

[0055] In addition, Figure 5 The simplified illustration in bold shows that a coating layer 68 is provided on the back of the glass plate 60, and an anti-scattering film 69 is provided on the back of the coating layer 68.

[0056] The material of the vacuum insulation component 50 is not particularly limited. For example, the vacuum insulation component 50 is composed of a core material such as glass fiber that is vacuum-packed with a laminated film and sealed by depressurization, thus exhibiting excellent thermal insulation performance. In addition, the vacuum insulation component 50 is formed in the shape of a flat plate and is attached to the back side of the glass plate 60.

[0057] The door insulation unit 1 is configured such that the glass panel 60 and the inner sidewall portion 32 are spaced apart in the front-to-back direction (front and back directions), a vacuum insulation member 50 is disposed on the front side of the storage space 62, and a foam insulation member 33 is disposed in the space other than the vacuum insulation member 50. The length of the vacuum insulation member 50 in the left-to-right direction (width direction) is shorter than that of the glass panel 60, and a foam insulation member 33 is also filled between the left end of the vacuum insulation member 50 and the frame member 64.

[0058] The foam insulation component 33 is filled into the storage space 62 formed by the glass plate 60 in which the vacuum insulation component 50 is placed in the center and the door frame 61 installed on the outer periphery of the glass plate 60. For example, the foam insulation component 33 is formed by foaming and curing polyurethane foam liquid (the raw material liquid of the foam insulation component) injected into the storage space 62 inside the door insulation door 1.

[0059] Next, in the insulation door structure described above, the glass peeling of glass plate 60 will be explained.

[0060] The core material of a typical vacuum insulation component 50 is such as Figure 6As shown, a core material 70 is formed by a flat (sheet-like) layer 71A of a specified weight and thickness. This core material is then subjected to heat-pressurization treatment using a heat-pressurization apparatus (in this case, a hot plate pressing method) 72 to form a heat-treated core material 73 for a vacuum insulation component. The dashed line indicates an outer casing 74 used to vacuum and house the heat-treated core material 73.

[0061] Here, since the heat-treated core material 73 is subjected to heat-pressurization treatment as a whole, core material regions 71AS, 71AM, and 71AS with different heat-treated states are formed. That is, the core material region 71AS on the front / back side is heated at a higher temperature, while the core material region 71AM near the center is heated at a lower temperature.

[0062] Here, in order to minimize the resilience of the heat-treated core material 73 of the vacuum insulation 50 without using adhesives, it is preferable to perform heat-pressurization treatment by adjusting the pressurization temperature, pressurization time, and pressurization pressure, so that a portion of the core material region 71AM near the center is thermally fused. By doing so, since the glass fibers in the core material region 71AM near the center of the heat-treated core material 73 are thermally fused, the resilience can be reduced even if air leakage occurs in the vacuum insulation 50.

[0063] However, as Figure 6 As shown, when the core material 70 is subjected to heat-pressurization treatment in a way that heat fusion is generated in a part of the core material region 71AM near the center, the heat fusion in the core material region 71AS on the front / back side becomes excessive, and the thermal insulation performance is greatly reduced due to solid heat conduction from the fiber-to-fiber fusion portion.

[0064] Therefore, in practice, to ensure the overall thermal insulation performance of the vacuum insulation component, heat-pressurization treatment is performed in a manner that ensures proper heat fusion in the core material region 71AS on the front / back sides. However, this introduces a new problem: insufficient heat fusion in the core material region 71AM near the center, resulting in increased resilience. That is, while the resilience is suppressed due to heat fusion on the front / back sides, the structure becomes prone to resilience due to insufficient heat fusion near the center.

[0065] Therefore, when using such a vacuum insulation component 50, such as Figure 7 As shown, glass peeling occurs in glass plate 60.

[0066] exist Figure 7In this process, before glass peeling occurs, the outer periphery of the glass plate 60 is brought into contact with and joined to the outer surface of the flange portion 64a formed on the frame member 64 using a bonding member 67 such as adhesive tape. In this state, if air leakage occurs in the vacuum insulation member 50 for some reason, the core material 73 of the vacuum insulation member 50, after heat treatment, attempts to return to its state before vacuuming by generating a restoring force (FR).

[0067] If the restoring force is greater than the bonding force that maintains the glass plate 60 in its current state, the vacuum insulation component 50 will push the glass plate 60 outward, resulting in glass peeling.

[0068] To suppress glass peeling caused by the recovery force generated in the vacuum insulation component due to air leakage, it is sufficient to keep the recovery force of the heat-treated core material 73 as low as possible. This embodiment proposes a new vacuum insulation component in this context.

[0069] The feature of this embodiment is that the vacuum insulation component includes at least: a laminated core material, which is formed by laminating multiple heat-treated unit core materials that are flat and made of glass fiber without the use of adhesives through heat-pressurization; and an outer casing for housing the laminated core material, wherein the internal space is depressurized. The structure of the vacuum insulation component of this embodiment will be described below.

[0070] like Figure 8 As shown, the core material of the vacuum insulation component 50 in this embodiment is formed by heat-pressurizing a flat (sheet-shaped) unit core material 71D of a specified weight using a heat-pressurizing treatment apparatus (here, a hot plate pressing method) 72 to create a heat-treated unit core material 71E for the vacuum insulation component. The weight ratio here... Figure 6 The core material has a low gram weight of 70 grams. In addition to hot plate pressing, it can also be heat-pressed using hot rollers, provided that the heat-pressing process is more appropriate.

[0071] Because the unit core material 71D has a low basis weight and thinness, heat can be easily and quickly transferred to the vicinity of the center of the unit core material 71D during hot pressing. For example, compared to Figure 6 The basis weight of core material 70 shown is approximately 1 / 3 of that of core material 71D.

[0072] In addition, the basis weight is determined to be the amount of heat that can be obtained near the center of the unit core material 71D when heat-pressurization treatment is performed.

[0073] Therefore, heat can easily pass through the core material region 71EM near the center between the front and back core material regions 71ES of the unit core material 71E in a short time. Therefore, even if heat-pressurization is performed in a manner that allows proper heat fusion to occur in the front and back core material regions 71ES in order to ensure the thermal insulation performance of the vacuum insulation, the core material region 71EM near the center of the unit core material 71E can achieve sufficient heat fusion.

[0074] Here, the temperature of the core material region 71EM near the center of the unit core material 71E is managed to be higher than the strain temperature to produce proper thermal fusion. For example, when glass fiber is used in the raw cotton of the core material, the strain temperature of short fibers (C glass) is about 500°C, so it is managed to be a higher temperature (e.g., 550°C). Conversely, the strain temperature of long fibers (E glass) is about 550~600°C, so it is managed to be a higher temperature (e.g., 650°C).

[0075] Multiple heat-treated unit core materials 71E (in this case, three layers) are stacked to form a laminated core material 75 consisting of three layers of heat-treated unit core materials 71E. This laminated core material 75 is then housed under an outer casing 74, and a vacuum is applied. The outer casing 74 then encloses the laminated core material 75, thus completing the vacuum insulation component 50. Furthermore, the number of heat-treated unit core materials 71E layers can be determined based on the required thickness of the vacuum insulation component 50.

[0076] In this way, the core material region 71EM near the center of the heat-treated unit core material 71E is fully heat-fused. Therefore, it is not easy to generate a restorative force, so even if an air leak occurs, the phenomenon of the glass plate 60 being squeezed out can be suppressed. In addition, the core material regions 71ES on the front and back sides are heat-pressurized in a manner that allows for appropriate heat fusion, so the overall thermal insulation performance can also be fully obtained.

[0077] like Figure 9 As shown, on the outer surface of the flange portion 64a formed on the frame member 64, a connecting member 67, such as an adhesive tape, is used to abut and join the outer periphery of the glass plate 60. In this state, if an air leak occurs in the vacuum insulation member 50 for some reason, the laminated core material 75 of the vacuum insulation member 50 attempts to return to the state before vacuuming. However, since the core material region 71EM near the center, which is prone to generating restorative force, is sufficiently thermally fused, it is not easy to generate restorative force, and the situation where the glass plate 60 is squeezed outward by the vacuum insulation member 50 can be suppressed.

[0078] Next, proceed Figure 6 The vacuum insulation component shown and Figure 8The specifications and performance of the vacuum insulation components shown are compared and explained. The raw cotton used is short-fiber glass fiber.

[0079] Firstly, regarding the core material, the vacuum insulation component of this embodiment (Example 1, Example 2) consists of three layers of a single core material, but the basis weight of one piece is 1400 g / m³. 2 The overall value is 4200 g / m³. 2 Furthermore, in the vacuum insulation component of this embodiment, the core material is hot-pressed layer by layer to form a vacuum insulation component, ultimately constituting a 3-layer structure. On the other hand, the existing vacuum insulation components (Comparative Example 1 and Comparative Example 2) have a unit core material of 1 layer, and the basis weight is the same as that of Examples 1 and 2, which is 4200 g / m³. 2 ].

[0080] Next, regarding the hot pressing specifications, the pressing time was 15 minutes in Example 1, 10 minutes in Example 2, 20 minutes in Comparative Example 1, and 20 minutes in Comparative Example 2. The longer pressing times in Comparative Examples 1 and 2 are due to the thicker core material 70, in order to increase the temperature near the center.

[0081] Next, considering the strain temperature of the glass fiber, the heating temperature was set to exceed the strain temperature, specifically 550°C in Example 1, 600°C in Example 2, 550°C in Comparative Example 1, and 600°C in Comparative Example 2, all of which were the same temperature. Furthermore, the center temperature near the center of the core material after hot pressing was 550°C in Example 1, 550°C in Example 2, 500°C in Comparative Example 1, and 550°C in Comparative Example 2. Here, the center temperature in Comparative Example 1 was 500°C, which did not exceed the strain temperature, becoming the main reason for insufficient heat fusion.

[0082] Next, the initial thickness of the core material for the vacuum insulation component was 150 mm in 3 layers in Examples 1 and 2, and was also 150 mm in Comparative Examples 1 and 2, which is the same thickness.

[0083] The basis weight of the above core material is 4200 g / m³. 2 The thickness of the vacuum insulation component obtained during the hot pressing process is 18mm, therefore the thickness after hot pressing is required to be 18mm.

[0084] On the other hand, after hot pressing (under the same conditions as when air leakage occurs because it is not covered by external components), Examples 1 and 2 are stacked in 3 layers, forming a thickness of 18 mm, Comparative Example 1 is formed in 25 mm, and Comparative Example 2 is formed in 18 mm. In Comparative Example 1, the center temperature is near the strain temperature, and insufficient heat fusion is achieved, resulting in a recovery phenomenon. Therefore, in Comparative Example 1, the thickness does not meet the required specifications.

[0085] Next, the thermal conductivity of a typical vacuum insulation component is 2.0~3.0 [mW / m·K], which is 2.4 [mW / m·K] in Example 1, 2.1 [mW / m·K] in Example 2, 2.6 [mW / m·K] in Comparative Example 1, and 5.6 [mW / m·K] in Comparative Example 2. In Comparative Example 2, the heating temperature is high and the heating time is long, so excessive thermal fusion occurs on the surface of the core material of the glass fiber, and the thermal insulation performance is greatly deteriorated.

[0086] Therefore, it can be seen that in Examples 1 and 2, when the layers are stacked in three layers, the thickness and thermal conductivity after hot pressing both meet the requirements. On the other hand, in Comparative Example 1, the thermal insulation performance is good, marked as "0", but the thickness after hot pressing increases, marked as "×", indicating that a regression phenomenon has occurred. Furthermore, in Comparative Example 2, the thickness after pressing is "0", but the thermal insulation performance is "×". This is because the heating temperature is high and the thermoforming time is long, resulting in excessive fusion of the glass fibers on the surface side and a deterioration in the thermal insulation performance.

[0087] Next, the relationship between the recovery amount and recovery force of the vacuum insulation component of this embodiment and conventional vacuum insulation components will be explained. The recovery amount and recovery force of the vacuum insulation component in the event of air leakage have… Figure 11 The relationship. Additionally, the measurement method here involves clamping a vacuum insulation component in an Autograph universal testing machine and measuring the recovery amount and recovery force of the vacuum insulation component when air leakage occurs.

[0088] As a measurement method, firstly, a vacuum insulation component is placed in a universal testing machine, with acrylic plates placed above and below it. The acrylic plates are configured to transmit the reaction force from the vacuum insulation component when air leakage occurs to the universal testing machine. The acrylic plates are 300mm × 300mm × 15mm in size, and the reaction force [N] of the 250mm × 500mm × 12mm vacuum insulation component is measured. The restoring force [MPa] is then calculated based on the measured area. Furthermore, the acrylic plates and vacuum insulation component are examples in this embodiment and are not limited to them.

[0089] Next, with the acrylic sheet, vacuum insulation component, and acrylic sheet positioned in the universal testing machine, the pressure measuring plate of the universal testing machine is brought into contact with the acrylic measuring plate until the pressure is zero. In this state, by creating an opening in the vacuum insulation component to allow air leakage, the restoring force of the vacuum insulation component can be measured. Furthermore, by raising the measuring height of the universal testing machine, the restoring force of the vacuum insulation component under its expansion can be measured.

[0090] like Figure 11 As shown, in existing vacuum insulation components, as mentioned above, to ensure insulation performance, the heat fusion near the center of the heat-treated core material 73 is insufficient. Therefore, the more the vacuum insulation component is confined in the recovery direction, the greater the recovery force. Thus, as... Figure 7 As shown, when the restoring force is greater than the bonding force of the connector 67, the glass plate 60 peels off from the connector 67, resulting in glass peeling.

[0091] On the other hand, according to this embodiment, because the heat insulation performance is ensured and the core material region 71EM near the center of the heat-treated unit core material 75 is sufficiently heat-fused, the restoring force does not increase even when the vacuum insulation is constrained in the restoration direction. Therefore, as Figure 9 As shown, the restoring force will not be greater than the bonding force of the connector 67, and glass peeling will not occur where the glass plate 60 is peeled off from the connector 67.

[0092] Next, the structure of mounting the vacuum insulation member 50 of this embodiment onto the glass plate 60 will be described. In the above embodiment, approximately the entire surface of the vacuum insulation member 50 is bonded to the back surface of the glass plate 60, but... Figure 12 , Figure 13 The paper proposes a structure in which the vacuum insulation element 50 and the glass plate 60 are not joined together, but a space is formed to absorb the expansion of the vacuum insulation element 50. However, for positioning purposes, a portion of the vacuum insulation element 50 is joined to the glass plate 60.

[0093] exist Figure 12 In this configuration, the periphery of the glass plate 60 abuts against the inwardly projecting flange 64a formed in the frame 64. A connecting member 67, such as an adhesive tape, is provided between the glass plate 60 and the flange 64a, thereby fixing the glass plate 60 to the frame 64. Here, the vacuum insulation member 60 overlaps with and is tightly attached to the flange 64a.

[0094] The outer edge 50E of the vacuum insulation element 50 is close to the wall surface of the frame 64, thereby obtaining a larger insulation area and thus helping to improve the insulation effect. This is because, as described above, the expansion of the vacuum insulation element is suppressed by using the heat-treated unit core material 75. Therefore, even if the area of ​​the vacuum insulation element 50 is increased, the increase in the restoring force when air leakage occurs can be suppressed. By making the restoring force of the vacuum insulation element 50 smaller than the bonding force of the joint 67, a product that does not peel off can be provided. In addition, although not shown, by increasing the area of ​​the vacuum insulation element 50, a vacuum insulation element 50 with high insulation performance can be arranged at the end of the door. In particular, in the sealing gasket fixing part 99, the insulation thickness is thinner. Therefore, by arranging the vacuum insulation element 50 on the projection of the sealing gasket fixing part 99, a product with high insulation performance can be provided.

[0095] Furthermore, a support member (so-called a miramat, a high-density polyethylene sheet) 76, in which numerous independent air bubbles are formed in polyethylene, is disposed between the glass plate 60 and the vacuum insulation member 50, thereby creating a space 77 between the vacuum insulation member 50 and the glass plate 60. Here, a bonding material is provided at the portion of the support member 76 that contacts both the glass plate 60 and the vacuum insulation member 50 to position them.

[0096] The aforementioned space 77 has the ability to absorb the restoring force caused by air leakage in the vacuum insulation 50 and the expansion of the heat-treated unit core material 75 due to the restoring force. This further suppresses glass peeling.

[0097] in addition, Figure 13 express Figure 12 In a modified example, a passage GP is formed between the flange portion 64a and the outer edge 50E of the vacuum insulation member 50, and a portion of the foam insulation member 33 reaches the periphery of the glass plate 60. This generates an adhesive force between the foam insulation member 33 and the glass plate 60, further suppressing glass peeling.

[0098] As described above, the present invention is characterized in that the vacuum insulation component comprises at least: a laminated core material, which is formed by laminating multiple units of processed core material obtained by heat-pressurizing a flat core material composed of inorganic fibers without adhesives; and an outer casing that houses the laminated core material and whose internal space is depressurized.

[0099] Therefore, even in the event of air leakage in the vacuum insulation component, the resilience of the unmixed adhesive core material can be suppressed to a low level, thus preventing glass peeling from the door frame.

[0100] Furthermore, the present invention is not limited to the above-described embodiments, but includes various modifications. The above-described embodiments are detailed descriptions provided for ease of understanding of the present invention and are not necessarily limited to including all the structures described. Additionally, a portion of the structure of one embodiment can be replaced with the structure of another embodiment, or the structure of another embodiment can be added to the structure of one embodiment. For each embodiment's structure, other structures can also be added, deleted, or replaced.

[0101] Explanation of reference numerals in the attached figures

[0102] 50……Vacuum insulation component, 60……Outer panel (glass plate), 61……Frame, 64……Frame component, 64a……Flange, 67……Joint, 71D……Unit core material, 71E……Heat-treated unit core material, 71ES……Front / back core material area of ​​unit core material, 71EM……Core material area near the center of unit core material, 76……Foaming pad, 77……Space, 78……Sealing gasket fixing part.

Claims

1. A vacuum insulation component, characterized in that, At least including: Laminated core material is formed by stacking multiple sheets of heat-treated unit core material, which is a flat unit core material composed of inorganic fibers without adhesives, through heat and pressure treatment; and An outer casing that houses the laminated core material and whose internal space is depressurized.

2. The vacuum insulation component according to claim 1, characterized in that: The inorganic fiber is glass fiber.

3. The vacuum insulation component according to claim 2, characterized in that: The glass fiber is either a short fiber or a long fiber.

4. The vacuum insulation component according to claim 2, characterized in that: The heat-treated unit core is formed from the unit core that has been heated to a temperature above the strain temperature of the glass fiber.

5. A cold storage room, comprising a cold storage compartment and / or a freezer compartment, and insulation doors respectively disposed in the cold storage compartment and / or the freezer compartment, characterized in that: The insulated door includes at least an outer panel disposed on its outer surface, a door frame disposed around the periphery of the outer panel, and a vacuum insulation component disposed on the back side of the outer panel. The periphery of the back side of the outer panel is joined to part or all of the door frame using a connector. The vacuum insulation component is the vacuum insulation component described in any one of claims 1 to 4.

6. The cold storage warehouse according to claim 5, characterized in that: When air leakage occurs in the vacuum insulation component, the restoring force of the vacuum insulation component is less than the joining force of the joint that joins the outer panel and the door frame.

7. The cold storage warehouse according to claim 5, characterized in that: A space is formed between the vacuum insulation component and the outer panel to absorb the expansion of the vacuum insulation component in the event of an air leak.

8. The cold storage warehouse according to claim 6, characterized in that: The outer panel is a glass plate made of glass.

9. A method for manufacturing a vacuum insulation component, the vacuum insulation component comprising at least a core material and an outer casing housing the core material, characterized in that the method comprises performing the following steps: The process of heat-pressurizing a flat unit core material made of inorganic fibers without adhesives to form a heat-treated unit core material. The process of stacking multiple heat-treated unit core materials to form a laminated core material; and The process of using an outer packaging to house the laminated core material and applying pressure.

10. The method for manufacturing a vacuum insulation component according to claim 9, characterized in that: The inorganic fiber is glass fiber. The heating temperature in the heat-pressurization process is a temperature above the strain temperature of the glass fiber.

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