Vacuum adiabatic body and refrigerator

Abstract

The vacuum insulation body of the present embodiment may include a first plate; a second plate; a sealing portion that seals the first plate and the second plate to provide a vacuum space; and a support that maintains the vacuum space. Optionally, the support may include a first support plate formed in a grid shape and a first support having a plurality of spacer coupling portions protruding from the first support plate. Optionally, the support may include a second support plate formed in a grid shape and a second support having a plurality of spacers protruding from the second support plate and coupled to each of the plurality of spacer coupling portions to form a plurality of bars together with the plurality of spacer coupling portions. Optionally, the support may include a radiation resistance sheet supported by some of the plurality of bars and spaced apart from one or more of the first support plate and the second support plate. Optionally, each support plate may include a plurality of through holes. Optionally, one through hole is defined by a pair of first extensions and a pair of second extensions intersecting the pair of first extensions, and the hydraulic diameter of each extension may be 1 or greater and 2.5 or less.

Description

Technology Field

[0001] The present invention relates to a vacuum insulation body and a refrigerator. Background Technology

[0002] Insulation performance can be improved by constructing an insulating wall with a vacuum. A device in which at least a portion of the internal space is made of a vacuum to obtain an insulating effect can be called a vacuum insulator.

[0003] The applicant has developed technology to obtain a vacuum insulation material that can be used in various devices and home appliances, and has disclosed a refrigerator having a vacuum space in Korean Application No. 10-2011-0113413 (Publication No. 10-2013-0048527).

[0004] The refrigerator comprises a main body having a storage space capable of accommodating a predetermined storage item, wherein the main body comprises: an inner case in which the storage space is formed on the inner side; an outer case in which the inner case is accommodated and which is spaced apart from the inner case by a predetermined distance; a vacuum space provided between the inner case and the outer case, the interior of which is sealed and maintained in a vacuum state to perform an insulating function between the inner case and the outer case; a first support plate provided on one of the mutually facing surfaces of the inner case and the outer case; and a plurality of spacers fixedly disposed on the first support plate to support and maintain the gap between the inner case and the outer case.

[0005] The main body further includes a second support plate provided on either of the mutually facing surfaces of the inner case and the outer case and positioned to face the first support plate.

[0006] The second support plate includes a plurality of grooves formed on its inner surface so that the ends of the plurality of spaces are inserted therein.

[0007] These prior art documents only disclose that the first support plate includes a spacer of the same shape, and do not disclose specific techniques for reducing heat transfer between support plates.

[0008] Furthermore, the prior art only discloses that the first support plate includes a plurality of spacers, and does not disclose a technique for uniformly forming each of the plurality of spacers in the first support plate. The problem to be solved

[0009] The present embodiment provides a vacuum insulation body and a refrigerator in which the vacuum insulation period and the molding rate of the support are increased.

[0010] Optionally or additionally, the present embodiment provides a vacuum insulation body and a refrigerator in which some of the multiple bars of the support are prevented from being underformed.

[0011] Optionally or additionally, the present embodiment provides a vacuum insulator and a refrigerator in which the shape of a plurality of bars of support can be injection molded into a required shape.

[0012] In addition to the examples presented above, the present invention proposes specific problems to be solved and means to solve them in [Means for Solving the Problem] and [Specific Details for Implementing the Invention]. means of solving the problem

[0013] A vacuum insulation body according to one aspect may include a first plate; a second plate; a sealing part that seals the first plate and the second plate so as to provide a vacuum space; and a support that maintains the vacuum space.

[0014] Optionally, the support may include a first support plate formed in a grid shape and a plurality of spacer coupling portions protruding from the first support plate. Optionally, the support may include a second support plate formed in a grid shape and a second support having a plurality of spacers protruding from the second support plate and coupled to each of the plurality of spacer coupling portions to form a plurality of bars together with the plurality of spacer coupling portions. Optionally, the support may include a radiation resistance sheet supported by some of the plurality of bars and spaced apart from one or more of the first support plate and the second support plate.

[0015] Optionally, each of the above support plates may include a plurality of through holes.

[0016] Optionally, one through hole may be defined by a pair of first extensions and a pair of second extensions that intersect the pair of first extensions.

[0017] Optionally, the hydraulic diameter of each of the above extensions may be 1 or more and 2.5 or less.

[0018] Optionally, the hydraulic diameter of each of the above extensions may be 1 or more and 2 or less.

[0019] Optionally, the hydraulic diameter of each of the above extensions may be 1.25 or more and 2.5 or less.

[0020] Optionally, the hydraulic diameter of each of the above extensions may be 1.25 or greater and 2.0 or less.

[0021] Optionally, the length of the first extension may differ from the length of the second extension. Optionally, the hydraulic diameter of the first extension may differ from the hydraulic diameter of the second extension.

[0022] Optionally, each of the first extension part and the second extension part includes a first surface and a second surface, and a spacer or a spacer coupling part may be provided on the second surface. Optionally, the length of the second surface may be longer than the length of the first surface.

[0023] Optionally, when the percentage of the total area obtained by subtracting the area of ​​one through hole from the total area of ​​one square connecting the center lines of the pair of first extensions and the pair of second extensions is called the grid area ratio, the grid area ratio may be 10% or more and 43% or less.

[0024] Optionally, the grid area ratio may be 10% or more and 28% or less. Optionally, the grid area ratio may be 15% or more and 43% or less. Optionally, the grid area ratio may be 15% or more and 28% or less.

[0025] Optionally, the number of through holes formed per square meter may be 30 or more and 90 or less. Optionally, the number of through holes formed per square meter may be 40 or more and 75 or less.

[0026] Optionally, the length of the first extension may differ from the length of the second extension. Optionally, the hydraulic diameter of the first extension may differ from the hydraulic diameter of the second extension.

[0027] Optionally, each of the first extension part and the second extension part includes a first surface and a second surface, and a spacer or a spacer coupling part may be provided on the second surface. Optionally, the length of the second surface may be longer than the length of the first surface.

[0028] Optionally, the refrigerator of the present embodiment may include the vacuum insulation described above. Effects of the invention

[0029] According to the present embodiment, the vacuum insulation period is secured, and the molding rate of the support can be increased.

[0030] According to the present embodiment, since the distribution structure is positioned in the through hole, it is evenly distributed into the injection liquid within the mold during the injection molding process of the support, thereby preventing some of the multiple bars from being under-molded.

[0031] According to the present embodiment, since there are multiple distribution structures, the injection liquid is distributed into the mold through multiple gates, and there is an advantage that multiple bar shapes can be injection molded into the required shape.

[0032] According to the present embodiment, since a distribution structure is positioned in the through hole, the injection liquid is distributed in multiple directions by the bridge, and there is an advantage that multiple bar shapes can be injection molded into the required shape. Brief explanation of the drawing

[0033] FIG. 1 is a perspective view of a refrigerator according to an embodiment. FIG. 2 is a schematic drawing showing a vacuum insulation used in the main body and door of a refrigerator. FIG. 3 is a drawing showing an example of a support that maintains a vacuum space. FIG. 4 is a drawing illustrating an embodiment of a vacuum insulation body centered on a heat transfer resistor. Figure 5 is a graph observing the process of exhausting the interior of a vacuum insulation body with respect to time and pressure when a support is used. Figure 6 is a graph comparing vacuum pressure and gas conductivity. FIG. 7 is a drawing showing various embodiments of the vacuum space section. Fig. 8 is a drawing illustrating an additional insulating element. FIG. 9 is a diagram illustrating the heat transfer path between first and second plates at different temperatures. FIG. 10 is a diagram illustrating a branching section on a heat transfer path between first and second plates with different temperatures. FIG. 11 is a drawing illustrating a method for manufacturing a vacuum insulation body. FIG. 12 is a perspective view of a support according to another embodiment. FIG. 13 is an exploded perspective view of the support of FIG. 12. FIG. 14 is a cross-sectional view showing the state in which the first support and the second support are combined. Fig. 15 is an enlarged view of section A of Fig. 14. Fig. 16 is an enlarged view of section B of Fig. 14. FIG. 17 is an enlarged view of section C of FIG. 14. Fig. 18 is an enlarged view of section D of Fig. 14. FIG. 19 is a bottom view of the second support. FIG. 20 is a cross-sectional view taken along 20-20 of FIG. 19. FIG. 21 is a cross-sectional view taken along 21-21 of FIG. 19. Figure 22 is a graph showing the forming rate according to the grid hydraulic diameter. FIGS. 23 to 28 are drawings showing injection time, injection pressure, and temperature according to the thickness of the grid and the length of the spacer. FIGS. 29 to 33 are drawings showing injection time, injection pressure, and temperature according to the hydraulic diameter of the grid and the length of the spacer. Figure 34 is a graph showing the forming rate according to the grid area ratio. Specific details for implementing the invention

[0034] Specific embodiments of the present invention will be described in detail below with reference to the drawings. However, the concept of the present invention is not limited to the embodiments presented below. Those skilled in the art who understand the concept of the present invention may easily propose other embodiments included within the scope of the same concept by adding, changing, deleting, or adding components or limitations regarding components, and such are also to be considered to be included within the scope of the concept of the present invention. The present invention may have many embodiments in which the concept is embodied, and in each embodiment, any part may be substituted with a corresponding part or a part that performs an associated function with another embodiment. The present invention may be any one of the examples presented below or an example in which two or more are combined.

[0035] The present invention may be a vacuum adiabatic body comprising: a first plate; a second plate; a vacuum space formed between the first and second plates; and a seal for providing the vacuum space (vacuum space). The vacuum space may be a vacuum space provided in the internal space between the first plate and the second plate. The seal may seal the first plate and the second plate to provide the internal space provided in a vacuum state. The vacuum adiabatic body may optionally include a side plate connecting the first plate and the second plate. In the present invention, the expression "plate" may mean at least one of the first and second plates and the side plate. At least a portion of the first and second plates and the side plate may be integrally formed or at least a portion may be sealed together. Optionally, the vacuum adiabatic body may include a support for maintaining the vacuum space. The vacuum insulator may optionally include a thermal insulator to reduce the amount of heat transfer between a first space provided near the first plate and a second space provided near the second plate, or to reduce the amount of heat transfer between the first plate and the second plate. Optionally, the vacuum insulator may include a component fastening portion formed on at least a part of the plate. Optionally, the vacuum insulator may include an additional adiabatic body. The additional adiabatic body may be provided to be connected to the vacuum insulator. The additional adiabatic body may be an adiabatic body having the same or different vacuum level as the vacuum insulator. The additional adiabatic body may be an adiabatic body having a lower vacuum level than the vacuum insulator or an adiabatic body that does not contain a vacuum-state portion inside.In this case, it may be advantageous to connect other objects to the additional insulation.

[0036] In the present invention, the direction along the wall defining the vacuum space may include the longitudinal direction of the vacuum space and the height direction of the vacuum space. The height direction of the vacuum space may be defined as the direction of any one of the virtual lines connecting the first space and the second space, which will be described later, while penetrating the vacuum space. The longitudinal direction of the vacuum space may be defined as a direction perpendicular to the height direction of the vacuum space set. In the present invention, being connected to object A may be defined as at least a part of object A and at least a part of object B being directly connected, or at least a part of object A and at least a part of object B being connected through an intermedium interposed between objects A and B. The intermedium may be provided to at least one of object A and object B. The connection may include object A being connected to the intermedium, and the intermedium being connected to object B. A part of the intermedium may include a portion connected to either object A or object B. Another part of the above medium may include a portion connected to the other of object A and object B. As a variation, object A being connected to object B may include object A and object B being prepared integrally in a shape connected by the aforementioned method. In the present invention, an embodiment of the connection may be a support, combine, or seal described later. In the present invention, object A being supported by object B may be defined as object A being restricted from moving in one or more of the +X, -X, +Y, -Y, +Z, and -Z axis directions by object B. In the present invention, an embodiment of the support may be a combine or seal described later.In the present invention, the statement that object A is combined with object B can be defined as the movement of object A being restricted by object B in one or more of the X, Y, and Z axis directions. In the present invention, an embodiment of the combination may be a seal, which will be described later. In the present invention, the statement that object A is sealed with object B can be defined as a state in which fluid movement is not permitted at the part where object A and object B are connected. In the present invention, one or more objects, namely, at least a part of object A and object B, can be defined as including a part of object A, the whole of object A, a part of object B, the whole of object B, a part of object A and a part of object B, a part of object A and the whole of object B, the whole of object A and a part of object B, and the whole of object A and the whole of object B. In the present invention, the statement that plate A may be a wall defining space A can be defined as at least a part of plate A being a wall forming at least a part of space A. That is, at least a portion of Plate A may be a wall forming space A, or Plate A may be a wall forming at least a portion of space A. In the present invention, the central portion of the object may be defined as the central portion among the three portions when the object is divided into three equal parts based on the longitudinal direction of the object. The peripheral portion of the object may be defined as the portion located to the left or right of the central portion among the three portions. The peripheral portion of the object may include a surface in contact with the central portion and a surface opposite thereto. The surface opposite thereto may be defined as the border or edge of the object. Examples of the object may include a vacuum insulator, a plate, a heat transfer resistor, a support, a vacuum space, and various components to be introduced in the present invention.In the present invention, the degree of heat transfer resistance indicates the degree to which an object resists heat transfer, and can be defined as a value determined by the shape including the thickness of the object, the material of the object, and the processing method of the object. The above heat transfer resistance can be defined as the sum of the degree of conduction resistance, the degree of radiation resistance, and the degree of convection resistance. The vacuum insulation of the present invention may include a heat transfer path formed between spaces with different temperatures, or a heat transfer path formed between plates with different temperatures. For example, the vacuum insulation of the present invention may include a heat transfer path through which cold is transferred from a plate with a low temperature toward a plate with a high temperature. In the present invention, a curved portion may be defined as a portion connecting the first portion and the second portion, provided that the object includes a first portion extending in a first direction and a second portion extending in a second direction different from the first direction (including 90 degrees).

[0037] In the present invention, the vacuum insulation may optionally include a component fastening portion. The component fastening portion may be defined as a part provided on a plate to which a component is connected. The component connected to the plate may be defined as a penetrating component positioned to penetrate at least a portion of the plate and a surface component positioned to be connected to the surface of at least a portion of the plate. At least one of the penetrating component and the surface component may be connected to the component fastening portion. The penetrating component may be a component that forms a path through which a fluid (electricity, refrigerant, water, and air, etc.) passes. In the present invention, a fluid is defined as any type of flowing object. The fluid includes moving solids, liquids, gases, and electricity, etc. As an example, the component may be a component that forms a path through which a refrigerant for heat exchange passes, such as a Suction Line Heat Exchanger (SLHX) or a refrigerant pipe. The component may be a wire that supplies electricity to an apparatus. As another example, the above-mentioned part may be a part that forms a path through which air can pass, such as a cold air duct, a hot air duct, and an exhaust port. As another example, the above-mentioned part may be a path through which a fluid can pass, such as coolant, hot water, ice, and defrost water. The above-mentioned surface part may include at least one of a peripheral insulation material, a side panel, an injected foam, a pre-prepared resin, a hinge, a latch, a basket, a drawer, a shelf, a light, a sensor, an evaporator, a front decoration, and a hot line, a heater, an exterior cover, and an additional insulation material.

[0038] As an example of application of the above vacuum insulation, the present invention may include an apparatus having said vacuum insulation. An example of said apparatus may be an appliance. Examples of said appliance may include home appliances such as refrigerators, cooking appliances, washing machines, dishwashers, and air conditioners. As an example of application of said vacuum insulation to an appliance, said vacuum insulation may form at least a part of the main body and door of the appliance. As an example of said door, said vacuum insulation may form at least a part of a general door and a door-in-door (DID) that are in direct contact with said main body. Here, said door-in-door may refer to a small door placed inside said general door. As another example of application of said vacuum insulation, the present invention may include a wall having said vacuum insulation. An example of said wall may be a wall of a building including a window.

[0039] The present invention will be described in detail below with reference to the drawings. Each drawing accompanying the embodiment may differ from, be exaggerated from, or be simplified compared to the actual article, and detailed parts may be briefly indicated. The embodiment should not be interpreted as being limited only to the size, structure, and shape presented in the drawings. In the embodiment accompanying each drawing, if the descriptions do not conflict, a part of the configuration in the drawing of one embodiment may be applied to a part of the configuration in the drawing of another embodiment, and a part of the structure of one embodiment may be applied to a part of the structure of another embodiment. In the description of the drawings for the embodiment, the same reference numeral may be assigned to specific components forming the embodiment in different drawings. Components having the same reference numeral may perform the same function. For example, the first plate forming the vacuum insulation body has a part corresponding to the first space throughout all embodiments and is indicated by reference numeral 10. Although the first plate has the same number for all embodiments and may have a part corresponding to the first space, the shape of the first plate may differ in each embodiment. In addition to the first plate mentioned above, the side plate, the second plate, and additional insulation materials can be understood in the same way.

[0040] FIG. 1 is a perspective view of a refrigerator according to an embodiment, and FIG. 2 is a schematic drawing showing a vacuum insulation used in the main body and door of the refrigerator. Referring to FIG. 1, the refrigerator (1) includes a main body (2) provided with a cavity (9) capable of storing items, and a door (3) provided to open and close the main body (2). The door (3) is arranged to be rotatable or sliding so as to open and close the cavity (9). The cavity (9) may provide at least one of a refrigerator compartment and a freezer compartment. A cold source may be provided to supply cold air to the cavity. For example, the cold source may be an evaporator (7) that removes heat by evaporating a refrigerant. The evaporator (7) may be connected to a compressor (4) that compresses the evaporated refrigerant to the cold source. The evaporator (7) may be connected to a condenser (5) that condenses the compressed refrigerant to the cold source. The above evaporator (7) may be connected to an expander (6) that expands the condensed refrigerant in the above cold source. A fan corresponding to the above evaporator and the above condenser may be provided to facilitate heat exchange. As another example, the above cold source may be the heat absorption surface of a thermoelectric element. A heat absorption sink may be connected to the heat absorption surface of the above thermoelectric element. A heat dissipation sink may be connected to the heat dissipation surface of the above thermoelectric element. A fan corresponding to the above heat absorption surface and the above heat dissipation surface may be provided to facilitate heat exchange.

[0041] Referring to FIG. 2, the plates (10, 15, 20) may be walls defining the vacuum space. The plates may be walls partitioning the vacuum space and the external space of the vacuum space. Examples of the plates are as follows. The present invention may be any one of the following examples or an example in which two or more are combined.

[0042] The plate may be provided as a single part or may be provided to include at least two parts connected to each other. As a first example, the plate may include at least two parts connected to each other in a direction along the wall defining the vacuum space. Either of the two parts may include a part forming the vacuum space (e.g., a first part). The first part may be a single part or may include at least two parts sealed to each other. The other of the two parts may include a part extending away from the first part of the first plate in a direction away from the vacuum space or extending inwardly into the vacuum space (e.g., a second part). As a second example, the plate may include at least two layers connected to each other in the thickness direction of the plate. Either of the two layers may include a layer forming the vacuum space (e.g., a first part). The other of the two layers may include a part (e.g., a second part) provided in the external space (e.g., a first space, a second space) of the vacuum space. In this case, the second part may be defined as the outer cover of the plate. The other of the two layers may include a portion (e.g., the second part) provided in the vacuum space. In this case, the second part may be defined as the inner cover of the plate.

[0043] The above plate may include a first plate (10) and a second plate (20). One side of the first plate (“inner surface of the first plate”) may provide a wall defining the vacuum space, and the other side of the first plate (“outer surface of the first plate”) may provide a wall defining the first space. The first space may be a space provided near the first plate, a space formed by the device, or an internal space of the device. In this case, the first plate may be referred to as an inner case. If the first plate and an additional member form the internal space, the first plate and the additional member may be referred to as an inner case. The inner case may include two or more layers. In this case, one of the multiple layers may be referred to as an inner panel. One side of the second plate (“inner surface of the second plate”) may provide a wall defining the vacuum space, and the other side of the second plate (“outer surface of the second plate”) may provide a wall defining the second space. The second space may be a space provided near the second plate, another space formed by the device, or an external space of the device. In this case, the second plate may be referred to as an outer case. If the second plate and an additional member form the external space, the second plate and the additional member may be referred to as an outer case. The outer case may include two or more layers. In this case, one of the multiple layers may be referred to as an outer panel. The second space may be a space with a higher temperature than the first space or a space with a lower temperature than the first space. Optionally, the plate may include a side plate (15). In FIG. 2, the side plate may also perform the function of a conductive resistance sheet (60) described later, depending on the position in which it is placed.The above side plate may include a portion extending in the height direction of the space formed between the first plate and the second plate, or a portion extending in the height direction of the vacuum space. One side of the side plate may provide a wall defining the vacuum space, and the other side of the side plate may provide a wall defining the external space of the vacuum space. The external space of the vacuum space may be at least one of the first space and the second space, or a space in which an additional insulating material to be described later is disposed. The side plate may be integrally formed by extending at least one of the first plate and the second plate, or may be a separate part connected to at least one of the first plate and the second plate.

[0044] The above plate may optionally include a curved portion. In the present invention, a plate including a curved portion may be referred to as a bent plate. The curved portion may be provided in at least one of the first plate, the second plate, the side plate, the space between the first plate and the second plate, the space between the first plate and the side plate, and the space between the second plate and the side plate. The plate may include at least one of a first curved portion and a second curved portion, and examples thereof are as follows. First, the side plate may include the first curved portion. A part of the first curved portion may include a portion connected to the first plate. Another part of the first curved portion may include a portion connected to the second curved portion. In this case, the radius of curvature of the first curved portion and the second curved portion may be large. Another part of the first curved portion may be connected to an additional straight portion or an additional curved portion provided between the first curved portion and the second curved portion. In this case, the radius of curvature of the first curved section and the second curved section may be small. Second, the side plate may include the second curved section. A part of the second curved section may include a portion connected to the second plate. Another part of the second curved section may include a portion connected to the first curved section. In this case, the radius of curvature of the first curved section and the second curved section may be large. Another part of the second curved section may be connected to an additional straight section or an additional curved section provided between the first curved section and the second curved section. In this case, the radius of curvature of the first curved section and the second curved section may be small. Here, the straight section may be defined as a part having a larger radius of curvature than the curved section. The straight section may be understood as a perfect plane or a part having a larger radius of curvature than the curved section.Third, the first plate may include the first curved portion. A portion of the first curved portion may include a portion connected to the side plate. The portion connected to the side plate may be provided at a position away from the second plate in the portion where the first plate extends in the longitudinal direction of the vacuum space. Fourth, the second plate may include the second curved portion. A portion of the second curved portion may include a portion connected to the side plate. The portion connected to the side plate may be provided at a position away from the first plate in the portion where the second plate extends in the longitudinal direction of the vacuum space. The present invention may include a combination of either one of the first and second examples described above and either one of the third and fourth examples described above.

[0045] In the present invention, the vacuum space (50) may be defined as a third space. The vacuum space may be a space where vacuum pressure is maintained. In the present invention, the expression that A has a higher degree of vacuum than B means that the vacuum pressure of A is lower than the vacuum pressure of B.

[0046] In the present invention, the sealing portion (61) may be a portion provided between the first plate and the second plate. Examples related to sealing are as follows. The present invention may be any one of the following examples or an example in which two or more are combined. The sealing may include fusion welding, which joins the plurality of objects by melting at least a portion of the plurality of objects. For example, the first plate and the second plate may be fused by laser welding, etc., without the interposition of a medium, or a portion of the first and second plates and a portion of the component fastening portion may be fused by high-frequency brazing, etc., with the interposition of a medium such as a filler agent, or the plurality of objects may be fused by a heat-generating medium (e.g., melting bond). The sealing may include pressure welding, which joins the plurality of objects by mechanical pressure applied to at least a portion of the plurality of objects. For example, as a part connected to the above-mentioned part fastening portion, an object made of a material with a lower deformation resistance than the plate may be press-welded by a method such as pinch-off.

[0047] A machine room (8) may be optionally provided on the outer side of the vacuum insulation body. The machine room may be defined as a space for housing components connected to the cold source. Optionally, the vacuum insulation body may include a port (40). The port may be provided on one side of the vacuum insulation body to exhaust air from the vacuum space (50). Optionally, the vacuum insulation body may include a conduit (64) penetrating the vacuum space (50) for installing components connected to the first space and the second space.

[0048] FIG. 3 is a drawing showing an embodiment of a support that maintains the vacuum space. Examples of the support are as follows. The present invention may be any one of the following examples or an example in which two or more are combined.

[0049] The above supports (30, 31, 33, 35) may be provided to support at least a portion of the plate and the heat transfer resistor described later, so as to reduce deformation of at least a portion of the vacuum space (50), the plate, and the heat transfer resistor described later due to an external force. The external force includes at least one of vacuum pressure and an external force excluding vacuum pressure. If the deformation occurs in a direction in which the height of the vacuum space decreases, the supports may reduce the increase of at least one of the radiative heat conduction, gas heat conduction, surface heat conduction, and supporter heat conduction described later. The supports may be objects provided to maintain a gap between the first plate and the second plate, or objects provided to support the heat transfer resistor. The supports may have a greater degree of deformation resistance than the plate, or may be provided to a portion of the vacuum insulation, the device having the vacuum insulation, the wall having the vacuum insulation, etc., where the degree of deformation resistance is weak. In the present invention, the degree of deformation resistance indicates the degree to which an object resists deformation caused by an external force applied to the object, and can be defined as a value determined by the shape including the thickness of the object, the material of the object, and the processing method of the object. Examples of parts with weak deformation resistance may include the vicinity of or at least a part of the curved portion formed by the plate, or the vicinity of or at least a part of the opening formed in the main body of the device provided by the plate. The support may be arranged to surround at least a part of the curved portion or the opening, or provided to correspond to the shape of the curved portion or the opening, but the support is not excluded from being provided in other parts. The opening may be understood as a part of the device having a main body and a door capable of opening and closing the opening formed in the main body.

[0050] Examples of how the support is provided to support the plate are as follows. First, at least a portion of the support may be provided in a space formed inside the plate. The plate may comprise a portion having a plurality of layers, and the support may be provided between the plurality of layers. Optionally, the support may be provided to be connected to at least a portion of the plurality of layers or to be provided to support at least a portion of the plurality of layers. Second, at least a portion of the support may be provided to be connected to a surface formed outside the plate. The support may be provided in the vacuum space portion or in the space outside the vacuum space portion. For example, the plate may comprise a plurality of layers, and the support may be provided to any one of the plurality of layers. Optionally, the support may be provided to support another of the plurality of layers. For another example, the plate may comprise a plurality of portions extending in the longitudinal direction, and the support may be provided to any one of the plurality of portions. Optionally, the support may be provided to support another of the plurality of portions. As another example, the support may be provided in the vacuum space or the external space of the vacuum space as a component distinct from the plate. Optionally, the support may be provided to support at least a portion of the surface formed on the outside of the plate. Optionally, the support may be provided to support one surface of the first plate and one surface of the second plate, and the one surface of the first plate and the one surface of the second plate may be provided to face each other. Thirdly, the support may be provided integrally with the plate. An example in which the support is provided to support the heat transfer resistor can be understood as an example in which the support is provided to support the plate. Redundant explanations are omitted.

[0051] Examples of how the above support is designed to reduce heat transfer through the support are as follows. First, at least a portion of a component disposed near the support may be provided so as not to come into contact with the support or disposed in an empty space provided by the support. Examples of the component may include a heat transfer resistor, an exhaust port, a getter port, a pipe or component connected to the plate, a pipe or component penetrating the vacuum space, or a pipe or component in which at least a portion is disposed in the vacuum space, etc. Examples of the empty space may include an empty space provided inside the support, an empty space provided between a plurality of supports, or an empty space provided between the support and a separate component distinguished from the support. Optionally, at least a portion of the component may be disposed in a through hole formed in the support, disposed between a plurality of bars, disposed between a plurality of connecting plates, or disposed between a plurality of support plates. Optionally, at least a portion of the component may be disposed in a space spaced apart between a plurality of bars, disposed in a space spaced apart between a plurality of connecting plates, or disposed in a space spaced apart between a plurality of support plates. Second, an insulating material may be provided on at least a portion of the support or in the vicinity of at least a portion of the support. The insulating material may be provided to be in contact with the support or not in contact with it. The insulating material may be provided at the portion where the support and the plate are in contact. The insulating material may be provided on at least a portion of one side and the other side of the support, or provided to cover at least a portion of one side and the other side of the support. The insulating material may be provided on at least a portion of the vicinity of one side of the support and the vicinity of the other side of the support, or provided to cover at least a portion of the vicinity of one side of the support and the vicinity of the other side of the support.The support comprises a plurality of bars, and an insulating material may be placed in the area from a point where any one of the plurality of bars is located to an intermediate point between any one bar and surrounding bars. Third, if cold air is transmitted through the support, a heat source may be placed at the location where the insulating material described in the second example is placed. If the temperature of the first space is lower than the temperature of the second space, the heat source may be placed on the second plate or near the second plate. If heat is transmitted through the support, a cold source may be placed at the location where the insulating material described in the second example is placed. If the temperature of the first space is higher than the temperature of the second space, the cold source may be placed on the second plate or near the second plate. As a fourth example, the support may include a portion having a heat transfer resistance higher than that of metal or a heat transfer resistance higher than that of the plate. The above support may include a portion having a lower thermal transfer resistance than an additional adiabatic body. The support may include at least one of a non-metallic material, PPS and GF (Glass Fiber), low outgassing PC, PPS, and LCP. This is because high compressive strength, low outgassing and water absorption, low thermal conductivity, high compressive strength at high temperatures, and excellent processability can be obtained.

[0052] Examples of supports may include a bar (30, 31), a connecting plate (35), a support plate (35), a porous material (33), and a filler (33). In the present invention, the support may be any one of the above examples or include an example in which at least two are combined. As a first example, the support may include a bar (30, 31). The bar may include a portion extending in a direction connecting the first plate and the second plate to support the gap between the first plate and the second plate. The bar may include a portion extending in the height direction of the vacuum space or a portion extending in a direction substantially perpendicular to the direction in which the plate extends. The bar may be provided to support only one of the first plate and the second plate, or the bar may be provided to support both the first plate and the second plate. For example, one side of the bar may be provided to support a part of the plate, and the other side of the bar may be provided so as not to come into contact with another part of the plate. As another example, one side of the bar may be provided to support at least a portion of the plate, and the other side of the bar may be provided to support another portion of the plate. The support may include a bar with a hollow space provided therein, or the support may include a plurality of bars with a hollow space provided between the plurality of bars, or the support may include a bar with a hollow space provided between separate parts provided apart from the bar. The support may optionally include a connecting plate (35) that includes a portion connected to the bar or a portion connecting the plurality of bars. The connecting plate may include a portion extending in the longitudinal direction of the vacuum space or a portion extending along the direction in which the plate extends. The cross-sectional area of ​​the XZ plane of the connecting plate may be larger than the cross-sectional area of ​​the XZ plane of the bar.The connecting plate may be provided on at least one of the first and second surfaces of the bar, or between the first and second surfaces of the bar. At least one of the first and second surfaces of the bar may be a surface on which the bar supports the plate. The shape of the connecting plate is not limited. The support may include a connecting plate provided with a void space inside, or the support may include a plurality of connecting plates with a void space provided between the plurality of connecting plates, or the support may include a connecting plate and be arranged so that a void space is provided between a separate part provided separately from the connecting plate. As a second example, the support may include a support plate (35). The support plate may include a portion extending in the longitudinal direction of the vacuum space or a portion extending along the direction in which the plate extends. The support plate may be provided to support only one of the first plate and the second plate, or the support plate may be provided to support both the first plate and the second plate. For example, one side of the support plate may be provided to support a portion of the plate, and the other side of the support plate may be provided so as not to come into contact with another portion of the plate. As another example, one side of the support plate may be provided to support at least a portion of the plate, and the other side of the support plate may be provided to support another portion of the plate. The cross-sectional shape of the support plate is not limited. The support may include a support plate provided with a void space inside, the support may include a plurality of support plates with a void space provided between the plurality of support plates, or the support may include a support plate and be arranged so that a void space is provided between a separate part provided separately from the support plate.As a third example, the support may include a porous material (33) or a filler (33). The interior of the vacuum space may be supported by the porous material or filler. The interior of the vacuum space may be wholly filled by the porous material or filler. The support may include a plurality of porous materials or a plurality of fillers, and the plurality of porous materials or a plurality of fillers may be arranged to be in contact. Where a void is provided within the porous material, where a void is provided between a plurality of porous materials, or where a void is provided between the porous material and a separate part distinguished from the porous material, the porous material may be understood as either a connecting plate or a support plate as described above. In cases where a void space is provided inside the filler, a void space is provided between a plurality of fillers, or a void space is provided between the filler and a separate part distinct from the filler, the filler may be understood as either a connecting plate or a support plate as described above. The support of the present invention may include any one of the aforementioned examples or an example in which two or more are combined.

[0053] Referring to FIG. 3a, as an embodiment, the support may include a bar (31) and a connecting plate and support plate (35). The connecting plate and the support plate may be designed separately. Referring to FIG. 3b, as an embodiment, the support may include a bar (31), a connecting plate and support plate (35), and a porous material (33) filled inside the vacuum space. The porous material (33) may have a higher emissivity than stainless steel, which is the material of the plate, but since it fills the vacuum space, it has a high resistance efficiency for radiant heat transfer. The porous material may also perform the function of a heat transfer resistor, which will be described later. More preferably, the porous material may perform the function of a radiant resistance sheet, which will be described later. Referring to FIG. 3c, as an embodiment, the support may include a porous material (33) or a filler (33). The porous material (33) can be provided in a compressed state to maintain the spacing of the vacuum space. The film (34) can be provided, for example, as a PE material with holes. The porous material (33) or the filler can perform both the function of a heat transfer resistor, which will be described later, and the function of the support. More preferably, the porous material can perform both the function of a radiation resistance sheet, which will be described later, and the function of the support.

[0054] FIG. 4 is a diagram illustrating an embodiment of a vacuum insulator centered on a thermal insulator (32, 33, 60, 63, thermal insulator, heat transfer resistance body). The vacuum insulator of the present invention may optionally include a thermal insulator. Examples of the thermal insulator are as follows. The present invention may be any one of the examples below or an example in which two or more are combined.

[0055] The heat transfer resistor (32, 33, 60, 63) may be an object that reduces the amount of heat transfer between the first space and the second space, or an object that reduces the amount of heat transfer between the first plate and the second plate. The heat transfer resistor may be placed on a heat transfer path formed between the first space and the second space, or on a heat transfer path formed between the first plate and the second plate. The heat transfer resistor may include a portion extending in a direction along the wall defining the vacuum space, or the heat transfer resistor may include a portion extending along the direction in which the plate extends. Optionally, the heat transfer resistor may include a portion extending from the plate away from the vacuum space. The heat transfer resistor may be provided in at least a portion of the periphery of the first plate and the periphery of the second plate, or in at least a portion of the edge of the first plate and the edge of the second plate. The heat transfer resistor may be provided in a portion where a through hole is formed, or as a tube connected to the through hole. A separate tube or a separate component distinct from the tube may be disposed inside the tube. The heat transfer resistor may include a portion having a greater heat transfer resistance than the plate. In this case, the thermal insulation performance of the vacuum insulation may be further improved. A shield (62) may be provided on the outside of the heat transfer resistor to provide insulation. The inside of the heat transfer resistor may be insulated by a vacuum space. The shield may be provided as a porous material or filler that contacts the outside of the inside of the heat transfer resistor. The shielding portion may be provided as an insulating structure, exemplified by a separate gasket placed on the outside of the heat transfer resistor. The heat transfer resistor may be a wall defining the third space.

[0056] An example in which a heat transfer resistor is connected to and provided on the plate can be understood by replacing the support with the heat transfer resistor in an example in which the support is provided to support the plate. Redundant descriptions are omitted. An example in which a heat transfer resistor is connected to and provided on the support can be understood by replacing the plate with the support in an example in which the heat transfer resistor is connected to and provided on the plate. Redundant descriptions are omitted. An example of reducing heat transfer via the heat transfer resistor can be applied as a substitute for an example of reducing heat transfer via the support, and the same description is omitted.

[0057] In the present invention, the heat transfer resistor may be any one of a radiation resistance sheet (32), a porous material (33), a filler (33), and a conduction resistance sheet. In the present invention, the heat transfer resistor may include a mixture of at least two of a radiation resistance sheet (32), a porous material (33), a filler (33), and a conduction resistance sheet. As a first example, the heat transfer resistor may include a radiation resistance sheet (32). The radiation resistance sheet may include a portion having a heat transfer resistance greater than that of the plate, and the heat transfer resistance may be a degree of resistance to heat transfer by radiation. The support may perform the function of the radiation resistance sheet. The conduction resistance sheet described later may perform the function of the radiation resistance sheet. As a second example, the heat transfer resistor may include a conduction resistance sheet (60, 63). The above-mentioned conductive resistance sheet may include a portion having a greater thermal transfer resistance than the plate, and the thermal transfer resistance may be the degree of resistance to heat transfer by conduction. For example, the above-mentioned conductive resistance sheet may have a thickness smaller than at least a portion of the plate. As another example, the above-mentioned conductive resistance sheet may include one end and the other end, and the length of the above-mentioned conductive resistance sheet may be longer than the straight distance connecting one end of the above-mentioned conductive resistance sheet and the other end of the above-mentioned conductive resistance sheet. As yet another example, the above-mentioned conductive resistance sheet may include a material having a greater thermal transfer resistance by conduction than the plate. As yet another example, the above-mentioned thermal transfer resistor may include a portion having a smaller radius of curvature than the plate.

[0058] Referring to FIG. 4a, for example, a conductive resistance sheet may be provided on a side plate connecting the first plate and the second plate. Referring to FIG. 4b, for example, a conductive resistance sheet (60) may be provided on at least a portion of the first plate and the second plate. A connecting frame (70) may be further provided on the outside of the conductive resistance sheet. The connecting frame may be an extended portion of the first plate or the second plate, or an extended portion of the side plate. Optionally, the connecting frame (70) may include a portion to which components disposed on the outside of the vacuum space are connected, such as a component for sealing between the door and the main body, an exhaust port required for the exhaust process, and a getter port for maintaining a vacuum. Referring to FIG. 4c, for example, a conductive resistance sheet may be provided on a side plate connecting the first plate and the second plate. The conductive resistance sheet may be installed in a through hole penetrating the vacuum space. The conduit (64) may be separately provided on the outer side of the conductive resistance sheet. The conductive resistance sheet may be provided in a corrugated form. This allows the heat transfer path to be extended and prevents deformation caused by pressure difference. A separate shielding member for insulating the conductive resistance sheet (63) may also be provided. The conductive resistance sheet may include a portion having a deformation resistance smaller than that of at least one of the plate, the radiation resistance sheet, and the support. The radiation resistance sheet may include a portion having a deformation resistance smaller than that of at least one of the plate and the support. The plate may include a portion having a deformation resistance smaller than that of the support. The conductive resistance sheet may include a portion having a conductive heat transfer resistance greater than that of at least one of the plate, the radiation resistance sheet, and the support. The radiation resistance sheet may include a portion having a radiative heat transfer resistance greater than that of at least one of the plate, the conductive resistance sheet, and the support.The support may include a portion having a heat transfer resistance greater than that of the plate. For example, at least one of the plate, the conductive resistance sheet, and the connecting frame may be made of stainless steel, the radiation resistance sheet may be made of aluminum, and the support may be made of a resin material.

[0059] FIG. 5 is a graph observing the process of evacuating the interior of a vacuum insulation body with respect to time and pressure when a support is used. An example of the vacuum evacuation step of the vacuum insulation body is as follows. The present invention may be any one of the following examples or an example in which two or more are combined.

[0060] While the above exhaust step is being performed, an outgassing step may be performed, which is a process in which gas in the vacuum space is exhausted or potential gas remaining in the components of the vacuum insulation is exhausted. As an example of the outgassing step, the exhaust step may include at least one of the steps of heating or drying the vacuum insulation, applying vacuum pressure to the vacuum insulation, and providing a getter to the vacuum insulation. In this case, the potential gas remaining in the components provided in the vacuum space may be vaporized and exhausted. The exhaust step may include a step of cooling the vacuum insulation. The cooling step may be performed after the step of heating or drying the vacuum insulation is performed. Preferably, the step of heating or drying the vacuum insulation and the step of applying vacuum pressure to the vacuum insulation may be performed together. Preferably, the step of heating or drying the vacuum insulation and the step of providing a getter to the vacuum insulation may be performed together. Preferably, after the step of heating or drying the vacuum insulation is performed, the step of cooling the vacuum insulation may be performed. Preferably, the step of providing vacuum pressure to the vacuum insulation and the step of providing a getter to the vacuum insulation may be performed so as not to overlap. For example, the step of providing a getter to the vacuum insulation may be performed after the step of providing vacuum pressure to the vacuum insulation is performed. When vacuum pressure is provided to the vacuum insulation, the pressure in the vacuum space may drop to a certain level and then stop dropping further. At this time, the step of providing vacuum pressure to the vacuum insulation may be stopped, and the getter may be introduced. An example of stopping the step of providing vacuum pressure to the vacuum insulation may be the cessation of the operation of the vacuum pump connected to the vacuum space. When introducing the getter, the step of heating or drying the vacuum insulation may be performed simultaneously. Through this, outgassing can be promoted.As another example, after the step of providing a getter to the vacuum insulation is performed, the step of providing vacuum pressure to the vacuum insulation may be performed.

[0061] The time during which the vacuum evacuation step of the vacuum insulation body is performed may be referred to as the vacuum evacuation time. The vacuum evacuation time may include at least one of the time during which the step of heating or drying the vacuum insulation body is performed (△t1), the time during which the step of maintaining the vacuum insulation body with a getter inserted is performed (△t2), and the time during which the step of cooling the vacuum insulation body is performed (△t3). Examples for △t1, △t2, and △t3 are as follows. Any of the following examples of the present invention may be an example in which two or more are combined. In the vacuum evacuation step of the vacuum insulation body, △t1 may be greater than or equal to t1a and less than or equal to t1b. As a first example, t1a may be greater than or equal to 0.2hr and less than or equal to 0.5hr. t1b may be greater than or equal to 1hr and less than or equal to 24.0hr. Preferably, the above △t1 may be 0.3 hr or more and 12.0 hr or less. Preferably, the above △t1 may be 0.4 hr or more and 8.0 hr or less. More preferably, the above △t1 may be 0.5 hr or more and 4.0 hr or less. In this case, it may be applied to a vacuum insulation body in which outgassing is sufficient even if △t1 is kept as short as possible. For example, among the components of the vacuum insulation body, the component exposed to the vacuum space may include a part having a lower outgassing rate (%) than any one of the components of the vacuum insulation body exposed to the external space of the vacuum space. Specifically, the component exposed to the vacuum space may include a part having a lower outgassing rate than the thermoplastic polymer. More specifically, a support or a radiation-resistant sheet may be placed in the vacuum space, and the outgassing rate of the support may be lower than that of the thermoplastic polymer.As another example, among the components of the vacuum insulator, the component exposed to the vacuum space may include a part having a higher maximum operating temperature (°C) than any of the components of the vacuum insulator exposed to the external space of the vacuum space. In this case, the vacuum insulator can be heated to a higher temperature, thereby increasing the outgassing rate. For example, the component exposed to the vacuum space may include a part having a higher operating temperature than the thermoplastic polymer. As a more specific example, a support or a radiation-resistant sheet may be placed in the vacuum space, and the operating temperature of the support may be higher than that of the thermoplastic polymer. As yet another example, among the components of the vacuum insulator, the component exposed to the vacuum space may include a greater amount of metallic material than non-metallic material. That is, the mass of the metallic material may be greater than the mass of the non-metallic material, the volume of the metallic material may be greater than the volume of the non-metallic material, or the area of ​​the metallic material exposed to the vacuum space The non-metallic material portion may be larger than the area exposed to the vacuum space. If there are multiple parts exposed to the vacuum space, the sum of the volume of the metal material contained in the first part and the volume of the metal material contained in the second part may be greater than the sum of the volume of the non-metallic material contained in the first part and the volume of the non-metallic material contained in the second part. If there are multiple parts exposed to the vacuum space, the sum of the mass of the metal material contained in the first part and the mass of the metal material contained in the second part may be greater than the sum of the mass of the non-metallic material contained in the first part and the mass of the non-metallic material contained in the second part.In the case where there are multiple parts exposed to the vacuum space, the sum of the area of ​​the metal material included in the first part exposed to the vacuum space and the area of ​​the metal material included in the second part exposed to the vacuum space may be greater than the sum of the area of ​​the non-metal material included in the first part exposed to the vacuum space and the area of ​​the non-metal material included in the second part exposed to the vacuum space. As a second example, t1a may be a value greater than or equal to 0.5hr and less than or equal to 1hr. t1b may be greater than or equal to 24.0hr and less than or equal to 65hr. Preferably, △t1 may be 1.0hr or more and 48.0hr or less. Preferably, △t1 may be 2hr or more and 24.0hr or less. More preferably, △t1 may be 3hr or more and 12.0hr or less. In this case, it may be a vacuum insulator that needs to maintain △t1 as long as possible. Examples of this case may include the opposite of the examples described in the first example above, or cases where the part exposed to the vacuum space is a thermoplastic material. Redundant descriptions are omitted. In the vacuum evacuation step of the vacuum insulator, △t2 may be greater than or equal to t2a and less than or equal to t2b. t2a may be greater than or equal to 0.1hr and less than or equal to 0.3hr. t2b may be greater than or equal to 1hr and less than or equal to 5.0hr. Preferably, △t2 may be greater than or equal to 0.2hr and less than or equal to 3.0hr. More preferably, △t2 may be greater than or equal to 0.3hr and less than or equal to 2.0hr. More preferably, △t2 may be greater than or equal to 0.5hr and less than or equal to 1.5hr. In this case, the vacuum insulation may be sufficient for outgassing through a getter even if △t2 is kept as short as possible. In the vacuum evacuation step of the vacuum insulation, △t3 may be greater than or equal to t3a and less than or equal to t3b. t3a may be greater than or equal to 0.2hr and less than or equal to 0.8hr. t3b may be greater than or equal to 1hr and less than or equal to 65.0hr.Preferably, the above △t3 may be 0.2 hr or more and 48.0 hr or less. Preferably, the above △t3 may be 0.3 hr or more and 24.0 hr or less. More preferably, the above △t3 may be 0.4 hr or more and 12.0 hr or less. More preferably, the above △t3 may be 0.5 hr or more and 5.0 hr or less. After the heating or drying step is performed during the above exhaust step, the above cooling step may be performed. For example, if the time during which the heating or drying step is performed is long, △t3 may be extended. The vacuum insulation body of the present invention may be manufactured such that △t1 is greater than △t2, or such that △t1 is less than or equal to △t3, or such that △t3 is greater than △t2. Preferably, △t2 < △t1 ≤ △t3. The vacuum insulation of the present invention may be manufactured such that △t1+△t2+△t3 is greater than or equal to 0.3 hr and less than or equal to 70 hr, greater than or equal to 1 hr and less than or equal to 65 hr, greater than or equal to 2 hr and less than or equal to 24 hr. More preferably, △t1+△t2+△t3 may be manufactured such that it is greater than or equal to 3 hr and less than or equal to 6 hr.

[0062] Examples of vacuum pressure conditions during the above exhaust step are as follows. The present invention may be any one of the following examples or an example in which two or more are combined. During the above exhaust step, the minimum vacuum pressure of the vacuum space may be greater than 1.8E-6 Torr. Preferably, the minimum vacuum pressure may be greater than 1.8E-6 Torr and less than or equal to 1.0E-4 Torr, greater than 0.5E-6 Torr and less than or equal to 1.0E-4 Torr, greater than 0.5E-6 Torr and less than or equal to 0.5E-5 Torr. More preferably, the minimum vacuum pressure may be greater than 0.5E-6 Torr and less than 1.0E-5 Torr. Limiting the minimum vacuum pressure provided during the above exhaust step in this way is because, even if pressure reduction is performed by a vacuum pump during the above exhaust step, the rate at which the vacuum pressure decreases slows down below a certain level. As an example, after the exhaust step is performed, the vacuum pressure of the vacuum space may be maintained at a pressure greater than or equal to 1.0E-5 Torr and less than or equal to 5.0E-1 Torr. The maintained vacuum pressure may be greater than or equal to 1.0E-5 Torr, less than or equal to 1.0E-1 Torr, greater than or equal to 1.0E-5 Torr, less than or equal to 1.0E-2 Torr, greater than or equal to 1.0E-4 Torr, less than or equal to 1.0E-2 Torr, greater than or equal to 1.0E-5 Torr, less than or equal to 1.0E-3 Torr, greater than or equal to 1.0E-4 Torr, and less than or equal to 1.0E-3 Torr. As a result of predicting the change in vacuum pressure through accelerated testing of two example products, it was confirmed that one vacuum pressure was maintained at 1.0E-04 Torr or lower even after 16.3 years, and the other vacuum pressure was maintained at 1.0E-04 Torr or lower even after 17.8 years.As such, the vacuum pressure of the vacuum insulation must be maintained below a predetermined level, even with aging changes, in order to be utilized in a desirable industrial manner.

[0063] Figure 5a is a graph of the elapsed time and pressure of an exhaust process according to one example, and Figure 5b explains the results of a long-term vacuum maintenance experiment conducted as an accelerated test on a vacuum insulation of a refrigerator with an internal volume of 128 liters. Referring to Figure 5b, it can be seen that the vacuum pressure gradually increases with age. For example, it was confirmed that it reached 6.7E-04 Torr after 4.7 years, 1.7E-03 Torr after 10 years, and 1.0E-02 Torr after 59 years. Based on these experimental results, it can be confirmed that the vacuum insulation according to the example is sufficiently suitable for industrial application.

[0064] FIG. 6 is a graph comparing vacuum pressure and gas conductivity. Referring to FIG. 6, the gas conductivity according to vacuum pressure is shown as a graph of the actual heat transfer coefficient (eK) according to the size of the gap inside the vacuum space (50). The gap of the vacuum space was measured in three cases: 3 mm, 4.5 mm, and 9 mm. The gap of the vacuum space is defined as follows: when the radiation resistance sheet (32) is inside the vacuum space, it is the distance between the radiation resistance sheet and the adjacent plate, and when the radiation resistance sheet is not inside the vacuum space, it is the distance between the first plate and the second plate. It was observed that the point corresponding to the actual heat transfer coefficient of 0.0196 W / mk, which is provided by foaming polyurethane as an insulating material, is 5.0E-1 Torr even when the gap size is small at 3 mm. Meanwhile, it was confirmed that even if the vacuum pressure decreases, the point at which the reduction effect of the insulation effect due to gas conduction heat becomes saturated is approximately 4.5E-3 Torr. The pressure of 4.5E-3 Torr can be determined as the point at which the reduction effect of gas conduction heat becomes saturated. In addition, when the actual heat transfer coefficient is 0.01 W / mk, it is 1.2E-2 Torr. An example presenting the range of vacuum pressure in the vacuum space according to the gap is as follows. When the support includes at least one of a bar, a connecting plate, and a support plate, and the gap in the vacuum space is greater than or equal to 3 mm, the vacuum pressure may be greater than or equal to A and less than 5E-1 Torr, or greater than 2.65E-1 Torr and less than 5E-1 Torr. As another example, the support comprises at least one of a bar, a connecting plate, and a support plate, and when the gap of the vacuum space is greater than or equal to 4.5 mm, the vacuum pressure may be greater than or equal to A and less than 3E-1 Torr, greater than 1.2E-2 Torr, and less than 5E-1 Torr.As another example, the support comprises at least one of a bar, a connecting plate, and a support plate, and when the gap of the vacuum space is greater than or equal to 9 mm, the vacuum pressure may be greater than or equal to A and less than 1.0 × 10^-1 Torr, greater than 4.5 E-3 Torr, and less than 5 E-1 Torr, where A may be greater than or equal to 1.0 × 10^-6 Torr and less than or equal to 1.0 E-5 Torr. Preferably, A may be greater than or equal to 1.0 × 10^-5 Torr and less than or equal to 1.0 E-4 Torr. When the support comprises a porous material or a filler, the vacuum pressure may be greater than or equal to 4.7 E-2 Torr and less than or equal to 5 E-1 Torr. In this case, the size of the gap can be understood to be from several micrometers to several hundred micrometers. When the support and the porous material are provided together in the vacuum space, a vacuum pressure intermediate between the case where only the support is used and the case where only the porous material is used can be created and used.

[0065] FIG. 7 is a drawing showing various embodiments of the vacuum space portion. The present invention may be any one of the following examples or an example in which two or more are combined.

[0066] Referring to FIG. 7, the vacuum insulation of the present invention may include a vacuum space. The vacuum space (50) may include a first vacuum space that extends in a first direction (e.g., X-axis) and has a predetermined height. The vacuum space (50) may optionally include a second vacuum space (hereinafter referred to as a vacuum space extension) that differs from the first vacuum space in at least one of height and direction. The vacuum space extension may be provided by extending at least one of the first and second plates and the side plate. In this case, the heat conduction path along the plate may be lengthened to increase the heat transfer resistance. The vacuum space expansion portion extended by the second plate can reinforce the thermal insulation performance of the front portion of the vacuum insulation body, the vacuum space expansion portion extended by the first plate can reinforce the thermal insulation performance of the rear portion of the vacuum insulation body, and the vacuum space expansion portion extended by the side plate can reinforce the thermal insulation performance of the side portion of the vacuum insulation body. Referring to FIG. 7a, the second plate can be extended to provide the vacuum space expansion portion (51). The second plate may include a second portion (202) extending from a first portion (201) that forms the vacuum space portion (50) and the vacuum space expansion portion (51). The second portion (202) of the second plate may branch the heat conduction path along the second plate to increase the heat transfer resistance. Referring to FIG. 7b, the side plate can be extended to provide the vacuum space expansion portion. The above side plate may include a second portion (152) extending from a first portion (151) forming the vacuum space portion (50) and the vacuum space expansion portion (51). The second portion of the side plate may branch a heat conduction path along the side plate, thereby improving thermal insulation performance.The first and second parts (151)(152) of the above side plate may branch the heat conduction path to increase the heat transfer resistance. Referring to FIG. 7c, the first plate may extend to provide the vacuum space expansion section. The first plate may include a second part (102) extending from the first part (101) forming the vacuum space section (50) and the vacuum space expansion section (51). The second part of the first plate may branch the heat conduction path along the second plate to increase the heat transfer resistance. Referring to FIG. 7d, the vacuum space expansion section (51) may include an X-direction extension section (51a) and a Y-direction extension section (51b) of the vacuum space section. The vacuum space expansion section (51) may extend in multiple directions of the vacuum space section (50). Through this, thermal insulation performance in multiple directions can be reinforced, and heat transfer resistance can be increased by extending the heat conduction path in multiple directions. The vacuum space expansion section extending in multiple directions can further improve thermal insulation performance by branching the heat conduction path. Referring to FIG. 7e, the side plate can provide the vacuum space expansion section extending in multiple directions. The vacuum space expansion section can reinforce the thermal insulation performance of the side portion of the vacuum insulation body. Referring to FIG. 7f, the first plate can provide the vacuum space expansion section extending in multiple directions. The vacuum space expansion section can reinforce the thermal insulation performance of the side portion of the vacuum insulation body.

[0067] FIG. 8 is a drawing illustrating an additional insulating member. The present invention may be any one of the following examples or an example in which two or more are combined. Referring to FIG. 8, the vacuum insulating member of the present invention may optionally include an additional insulating member (90). The additional insulating member may be an object having a lower vacuum level than the vacuum insulating member or not containing a vacuum portion inside. The vacuum insulating member and the additional vacuum insulating member may be directly connected or connected through a medium. In this case, the medium may be an object having a lower vacuum level than at least one of the vacuum insulating member and the additional insulating member or not containing a vacuum portion inside. When the vacuum insulating member includes a high portion of the vacuum insulating member and a low portion of the vacuum insulating member, the additional insulating member may be placed in the low portion of the vacuum insulating member. The additional insulating member may include a portion connected to at least some of the first and second plates and the side plate. The additional insulating member may be supported on, coupled to, or sealed by the plate. The degree of sealing between the additional insulation and the plate may be lower than the degree of sealing between the plates. The additional insulation may include a cured insulation that hardens after injection (e.g., PU foam), a pre-molded resin, a peripheral insulation, and a side panel, etc. At least a portion of the plate may be provided to be located inside the additional insulation. The additional insulation may include a void space. The plate may be provided to be accommodated in the void space. At least a portion of the plate may be provided to cover at least a portion of the additional insulation. The additional insulation may include a member covering its outer surface. The member may be at least a portion of the plate. The additional insulation may be a medium for connecting, supporting, joining, or sealing the vacuum insulation and the component.The additional insulation may be a medium for connecting, supporting, joining, or sealing the vacuum insulation and another vacuum insulation. The additional insulation may include a portion connected to a component fastening portion provided on at least a portion of the plate. The additional insulation may include a portion connected to a cover covering the additional insulation. The cover may be positioned between the first plate and the first space, between the second plate and the second space, or between the side plate and a space other than the vacuum space (50). For example, the cover may include a portion on which a component is mounted. For another example, the cover may include a portion forming the exterior of the additional insulation. Referring to FIGS. 8a–f, the additional insulation may include a peripheral insulation. The peripheral insulation may be positioned on the periphery of the vacuum insulation, the periphery of the first plate, the periphery of the second plate, and at least a portion of the side plate. A peripheral insulation member disposed on the periphery of the first plate or on the second plate may extend to the portion where the side plate is formed or extend to the outside of the side plate. A peripheral insulation member disposed on the side plate may extend to the portion where the first plate or the second plate is formed or extend to the outside of the first plate or the second plate. Referring to FIGS. 8g to 8h, the additional insulation member may include a central insulation member. The central insulation member may be disposed in at least a portion of the central part of the vacuum insulation member, the central part of the first plate, and the central part of the second plate.

[0068] Referring to FIG. 8a, the peripheral insulation (92) may be placed around the periphery of the first plate. The peripheral insulation may come into contact with the first plate. The peripheral insulation may be separated from the first plate or extended further (indicated by a dotted line). The peripheral insulation may improve the thermal insulation performance around the periphery of the first plate. Referring to FIG. 8b, the peripheral insulation may be placed around the periphery of the second plate. The peripheral insulation may come into contact with the second plate. The peripheral insulation may be separated from the second plate or extended further (indicated by a dotted line). The peripheral insulation may improve the thermal insulation performance around the periphery of the second plate. Referring to FIG. 8c, the peripheral insulation may be placed around the periphery of the side plate. The peripheral insulation may come into contact with the side plate. The peripheral insulation may be separated from the side plate or extended further. The above peripheral insulation can improve the thermal insulation performance of the periphery of the side plate. Referring to FIG. 8d, the peripheral insulation (92) can be placed around the periphery of the first plate. The peripheral insulation can be placed around the periphery of the first plate forming the vacuum space expansion (51). The peripheral insulation can be in contact with the first plate forming the vacuum space expansion. The peripheral insulation can be separated from or further extended from the first plate forming the vacuum space expansion. The peripheral insulation can improve the thermal insulation performance of the periphery of the first plate forming the vacuum space expansion. Referring to FIG. 8e and FIG. 8f, the peripheral insulation can be placed around the periphery of the second plate or the side plate where the vacuum space expansion is located. The same description as FIG. 8d can be applied. Referring to FIG. 8g, the central insulation (91) can be placed around the central part of the first plate.The central insulating member can improve the thermal insulation performance of the central portion of the first plate. Referring to FIG. 8h, the central insulating member can be placed in the central portion of the second plate. The central insulating member can improve the thermal insulation performance of the central portion of the second plate.

[0069] FIG. 9 is a diagram illustrating a heat transfer path between first and second plates with different temperatures. Examples of the heat transfer path are as follows. The present invention may be any one of the examples below or an example in which two or more are combined.

[0070] The heat transfer path may pass through an extended portion in at least a part of the first portion (101) of the first plate, the first portion (201) of the second plate, and the first portion (151) of the side plate. The first portion may include a portion forming the vacuum space. The extended portion (102, 152, 202) may include a portion extending away from the first portion. The extended portion may include a portion extending toward the side portion of the vacuum insulation body, the side portion of the plate with the higher temperature among the first and second plates, or the side portion of the vacuum space (50). The extended portion may include a portion extending away from the front portion of the vacuum insulation body, the front portion of the plate with the higher temperature among the first and second plates, or the front portion of the vacuum space (50). By doing so, the formation of dew on the front portion can be reduced. The vacuum insulation body or the vacuum space (50) may include first and second surfaces with different temperatures. The first surface may have a lower temperature than the second surface. For example, the first surface may be the first plate and the second surface may be the second plate. The extended portion may include a portion that extends away from the second surface or extends toward the first surface. The extended portion may include a portion that contacts the second surface or a portion that extends while in contact. The extended portion may include a portion that extends while spaced apart from the second surface. The extended portion may include a portion that has a heat transfer resistance greater than at least a part of the plate or a heat transfer resistance greater than the first surface. The extended portion may include a plurality of portions that extend in different directions.For example, the extended portion may include a second portion (202) of the second plate and a third portion (203) of the second plate. A third portion may also be provided on the first plate or the side plate. This allows the heat transfer path to be lengthened to increase the heat transfer resistance. The aforementioned heat transfer resistance body may be disposed in the extended portion. An additional insulating body may be disposed on the outer side of the extended portion. This allows the extended portion to reduce the formation of dew on the second surface. Referring to FIG. 9a, the second plate may include the extended portion extending to the periphery of the second plate. Here, the extended portion may further include extending to the rear. Referring to FIG. 9b, the side plate may include the extended portion extending to the periphery of the side plate. Here, the extended portion may be provided with a length shorter than or equal to that of the extended portion of the second plate. Here, the extended portion may further include a portion extending rearward. Referring to FIG. 9c, the first plate may include the extended portion extending to the periphery of the first plate. Here, the extended portion may be extended to a length shorter than or equal to the extended portion of the second plate. Here, the extended portion may further include a portion extending rearward.

[0071] FIG. 10 is a diagram illustrating a branch on a heat transfer path between first and second plates with different temperatures. Examples of said branch are as follows. The present invention may be any one of the following examples or an example in which two or more are combined.

[0072] Optionally, the heat transfer path may pass through a branched portion (205, 153, 104) in at least some of the first plate, the second plate, and the side plate. Here, the branched heat transfer path refers to a heat transfer path that flows separately in a different direction from the heat transfer path flowing along the plate. The branched portion may be formed in a direction away from the vacuum space (50). The branched portion may be formed in a direction toward the interior of the vacuum space (50). Since the branched portion can perform the same function as the extended portion described in FIG. 9, a description of the same portion is omitted. Referring to FIG. 10a, the second plate may include the branched portion (205). A plurality of the branched portions may be provided spaced apart from each other. The branched portion may include a third portion (203) of the second plate. Referring to FIG. 10b, the side plate may include the branched portion (153). The branched portion (153) may branch off from the second portion (152) of the side plate. At least two branched portions (153) may be provided. The second portion (152) of the side plate may be provided with at least two branched portions (153) spaced apart from each other. Referring to FIG. 10c, the first plate may include the branched portion (104). The branched portion may extend further from the second portion (102) of the first plate. The branched portion may extend toward the periphery. The branched portion (104) may be bent to extend further. The direction in which the branched portion extends in FIG. 10a, b, and c may be the same as at least one of the extension directions of the extended portion described in FIG. 10.

[0073] Figure 11 is a diagram illustrating the manufacturing process of a vacuum insulation body.

[0074] Optionally, the vacuum insulation may be manufactured by a vacuum insulation component preparation step in which the first plate and the second plate are prepared in advance. Optionally, the vacuum insulation may be manufactured by a vacuum insulation component assembly step in which the first plate and the second plate are assembled. Optionally, the vacuum insulation may be manufactured by a vacuum insulation vacuum exhaust step in which gas in the space formed between the first plate and the second plate is discharged. Optionally, after the vacuum insulation component preparation step is performed, the vacuum insulation component assembly step or the vacuum insulation vacuum exhaust step may be performed. Optionally, after the vacuum insulation component assembly step is performed, the vacuum insulation vacuum exhaust step may be performed. Optionally, the vacuum insulation may be manufactured by a vacuum insulation component sealing step (S3) in which the space between the first plate and the second plate is sealed. The above vacuum insulation component sealing step may be performed prior to the vacuum insulation vacuum evacuation step (S4). The vacuum insulation may be manufactured into an object with a specific purpose by a device assembly step (S5) in which the vacuum insulation is combined with a component constituting a device. The above device assembly step may be performed after the vacuum insulation vacuum evacuation step. Here, the component constituting the device refers to a component constituting the device together with the vacuum insulation.

[0075] The vacuum insulation component preparation step (S1) is a step in which components constituting the vacuum insulation are prepared or manufactured. Examples of components constituting the vacuum insulation may include various parts such as plates, supports, heat transfer resistors, and tubes. The vacuum insulation component assembly step (S2) is a step in which the prepared components are assembled. The vacuum insulation component assembly step may include a step in which at least some of the supports and heat transfer resistors are placed on at least a portion of the plates. For example, the vacuum insulation component assembly step may include a step in which at least some of the supports and heat transfer resistors are placed between the first plate and the second plate. Optionally, the vacuum insulation component assembly step may include a step in which a penetration component is placed on at least a portion of the plates. For example, the vacuum insulation component assembly step may include a step in which a penetration component or a surface component is placed between the first and second plates. After the through-part is placed between the first plate and the second plate, the through-part may be connected to or sealed at the through-part fastening portion.

[0076] Examples of the vacuum evacuation step of the vacuum insulation body are as follows. The present invention may be any one of the examples below or an example in which two or more are combined. The vacuum evacuation step of the vacuum insulation body may include at least one of the steps of introducing the vacuum insulation body into the exhaust passage, activating the getter, checking for vacuum leakage, and closing the exhaust port. The step of forming the component fastening part may be performed in at least one of the steps of preparing the vacuum insulation body component, assembling the vacuum insulation body component, and assembling the device. Before the vacuum evacuation step of the vacuum insulation body is performed, a step of cleaning the component constituting the vacuum insulation body may be performed. Optionally, the cleaning step may include a step of applying ultrasound to the component constituting the vacuum insulation body, or a step of providing ethanol or a substance containing ethanol to the surface of the component constituting the vacuum insulation body. The ultrasound may have an intensity between 10 kHz and 50 kHz. The ethanol content of the substance may be 50% or more. For example, the ethanol content of the above material may be 50% to 90% or less. As another example, the ethanol content of the above material may be 60% to 80% or less. As yet another example, the ethanol content of the above material may be 65% to 75% or less. Optionally, after the washing step is performed, a step of drying the components constituting the vacuum insulation may be performed. Optionally, after the washing step is performed, a step of heating the components constituting the vacuum insulation may be performed.

[0077] The contents described in FIGS. 1 to 11 may be applied to all or optionally to the embodiments presented in the following drawings.

[0078] As an example, examples of processes related to the support are as follows. The present invention may be any one of the following examples or an example combining two or more of them. The vacuum insulation component preparation step may include a step of manufacturing the support. The step of manufacturing the support may be performed before the vacuum insulation vacuum evacuation step is performed. For example, the support may be manufactured by injection molding. Optionally, a step of cleaning the support may be performed before the vacuum insulation vacuum evacuation step is performed. A step of storing the support under predetermined conditions may be performed before or during the vacuum insulation vacuum evacuation step is performed. For example, the first storage step may be performed before the vacuum insulation vacuum evacuation step is performed, and the second storage step may be performed during the vacuum insulation vacuum evacuation step. As another example, the storage step may be performed during the vacuum insulation vacuum evacuation step. Examples of the storage step are as follows. As a first example, the storage step may include a step in which the support is dried or heated. Through this, outgassing may be performed on the support. The heating temperature may be higher than a predetermined reference temperature and lower than the melting point of the support. The predetermined reference temperature may be a temperature between 10 and 40 degrees. The heating temperature may be higher than 80 degrees and lower than 280 degrees. The heating temperature may be higher than 100 degrees and lower than 260 degrees. The heating temperature may be higher than 120 degrees and lower than 240 degrees. The heating temperature may be higher than 140 degrees and lower than 220 degrees. The heating temperature may be higher than 160 degrees and lower than 200 degrees. The heating temperature may be higher than 170 degrees and lower than 190 degrees. The heating temperature in the first storage step may be lower than the heating temperature in the second storage step. Optionally, the storage step may include a step in which the support is cooled.After the step of drying or heating the support is performed, the step of cooling the support may be performed. As a second example, the storage step may include a step in which the support is stored at a pressure lower than atmospheric pressure. Through this, outgassing may be performed on the support. The storage pressure may be lower than the pressure of the vacuum state in which the internal space between the first plate and the second plate is maintained. The storage pressure may be higher than 10E-10 torr and lower than atmospheric pressure. The storage pressure may be higher than 10E-9 torr and lower than atmospheric pressure. The storage pressure may be higher than 10E-8 torr and lower than atmospheric pressure. The storage pressure may be higher than 10E-7 torr and lower than atmospheric pressure. The storage pressure may be higher than 10E-3 torr and lower than atmospheric pressure. The storage pressure may be higher than 10E-2 torr and lower than atmospheric pressure. The storage pressure may be higher than 0.5E-1 torr and lower than atmospheric pressure. The storage pressure may be higher than 0.5E-1 torr and lower than 3E-1 torr. The storage pressure in the first storage step may be higher than the storage pressure in the second storage step. Optionally, the storage step may include a step of storage at atmospheric pressure. After the step of storing the support at atmospheric pressure is performed, the step of storing the support at atmospheric pressure may be performed.

[0079] Optionally, before the vacuum evacuation step of the vacuum insulation body is performed, a step of joining a plurality of parts of the support together may be performed. For example, the joining step may include a step of joining the bar of the support and a connecting plate. As another example, the joining step may include a step of joining the bar of the support and a support plate.

[0080] Regarding the support, the process may optionally include a process related to the step of storing the support under predetermined conditions. An example of a process sequence related to the step of storing the support under predetermined conditions is as follows. The present invention may be any one of the following examples or an example in which two or more are combined. After the step of drying or heating the support is performed, at least one of the steps of storing the support at a state lower than atmospheric pressure, cooling the support, and storing the support at atmospheric pressure may be performed. After the step of storing the support at a state lower than atmospheric pressure is performed, at least one of the steps of drying or heating the support, cooling the support, and storing the support at atmospheric pressure may be performed. The step of drying or heating the support and the step of storing the support under a state lower than atmospheric pressure may be performed simultaneously. The step of drying or heating the support and the step of storing the support at atmospheric pressure may be performed simultaneously. The step of storing the support under conditions lower than atmospheric pressure and the step of cooling the support can be performed simultaneously.

[0081] With respect to the above support, the process may optionally include a process related to the step of joining the support. An example of a process sequence related to the step of joining the support is as follows. The present invention may be any one of the following examples or an example in which two or more are combined. Before the joining step is performed, a step of providing a separate part separated from the support in a space provided inside the support may be performed. For example, the part may include a heat transfer resistor. After the joining step is performed, a step of packaging or storing the support in a vacuum state may be performed. After the step of storing the support under predetermined conditions is performed, a step of joining a plurality of parts of the support together may be performed.

[0082] Regarding the support, the process may optionally include a process related to the step of cleaning the support. An example of a process sequence related to the step of cleaning the support is as follows. The present invention may be any one of the following examples or an example in which two or more are combined. After the step of manufacturing the support is performed, at least one of the step of cleaning the support, the step of storing the support under a predetermined condition, and the step of joining a plurality of parts of the support together may be performed. After the step of cleaning the support is performed, at least one of the step of storing the support under a predetermined condition and the step of joining a plurality of parts of the support together may be performed. Before the step of cleaning the support is performed, at least one of the step of storing the support under a predetermined condition and the step of joining a plurality of parts of the support together may be performed.

[0083] Regarding the above support, the process may optionally include a process related to the step of providing the support to the plate. An example of a process sequence related to the step of providing the support to the plate is as follows. The present invention may be any one of the following examples or an example combining two or more of them. Before the vacuum insulation vacuum evacuation step is performed, the support may be provided in the space between the first plate and the second plate. Before the vacuum insulation vacuum evacuation step is performed, the support may be provided inside the plate or on the surface of the plate. Before the vacuum insulation vacuum evacuation step is performed, the support may be coupled to the plate. After the component fastening part is provided on a part of the plate, the support may be provided in the space between the first plate and the second plate.

[0084] FIG. 12 is a perspective view of a support according to another embodiment, and FIG. 13 is an exploded perspective view of the support of FIG. 12.

[0085] Referring to FIGS. 12 and 13, the support (30b) of the present embodiment may include a first support (350b), a second support (360b) coupled to the first support (350b), and one or more radiation resistance sheets (32) disposed between the first support (350b) and the second support (360b). One or more of the first support (350b) and the second support (360b) may support the radiation resistance sheet (32) with the radiation resistance sheet (32) penetrating it. If the support (30b) includes a plurality of radiation resistance sheets (32), the first support (350b) and the second support (360b) may support the plurality of radiation resistance sheets (32) with the plurality of radiation resistance sheets (32) spaced apart. Figure 13 shows three radiation resistance sheets (32) as an example.

[0086] The first support (350b) may contact the inner case (110). The second support (360b) may contact the outer case (210). Conversely, it is also possible for the first support (350b) to contact the outer case (210) and for the second support (360b) to contact the inner case (110).

[0087] The second support (360b) may be arranged by combining a plurality of second support bodies (360b1, 360b2, 360b3) having the same structure in the Z-axis direction (for example, the up-down direction of the door (length direction)). The first support (350b) may include the first type of first support body (350b1), the second type of first support body (350b2, 350b3), and the third type of first support body (350b4). The X-axis lengths of the first to third types of support bodies (350b1, 350b2, 350b3, 350b4) are the same. The length in the Z-axis direction of the first support body (350b2, 350b3) of the second type is longer than the length of the first support body (350b1) of the first type and the first support body (350b4) of the third type. The first support body (350b1) of the first type can be coupled to the second support body (360b1) that is arranged first among the plurality of second support bodies (360b1, 360b2, 360b3). Additionally, a part of the first support body (350b2) of the second type can be coupled to the second support body (360b) that is arranged first. At this time, the first support body (350b1) of the first type and the first support body (350b2) of the second type can be spaced apart in the Z-axis direction. In the second support body (360b2) arranged second among the plurality of second support bodies (360b1, 360b2, 360b3), another part of the second type of first support body (350b2) and another part of the second type of first support body (350b3) may be combined. In the second support body (360b3) arranged third among the plurality of second support bodies (360b1, 360b2, 360b3), another part of the other second type of first support body (350b3) and a third type of first support body (350b4) may be combined.

[0088] FIG. 14 is a cross-sectional view showing the state in which the first support and the second support are combined.

[0089] Referring to FIGS. 13 and 14, the first support (350b) may include a first support plate (351) formed in a grid shape. That is, the first support plate (351) may include a plurality of through holes (352). For example, two first extension parts extending in the Z-axis direction and two second extension parts extending in the X-axis direction may define a single through hole (352). A plurality of through holes (352) may be arranged in a plurality along the X-axis and Z-axis, respectively. The first support (350b) may include a plurality of spacer coupling parts (356) extending from the first support plate (351) in a direction intersecting the first support plate (351). For example, the plurality of spacer coupling parts (356) may extend from the first support plate (351) in the Y-axis direction. Each spacer coupling part (356) may be located at the portion where the first extension part and the second extension part are connected. A plurality of spacer coupling parts (356) may be distinguished based on length in the Y-axis direction, for example, height. A plurality of spacer coupling parts (356) may include some or all of the first spacer coupling part (356a), the second spacer coupling part (356b), and the third spacer coupling part (356c). Hereinafter, an example is described in which a plurality of spacer coupling parts (356) includes the first spacer coupling part (356a), the second spacer coupling part (356b), and the third spacer coupling part (356c). The second spacer connecting part (356b) is longer than the first spacer connecting part (356a), and the third spacer connecting part (356c) is longer than the second spacer connecting part (356b). Among the plurality of spacer connecting parts (356), the number of first spacer connecting parts (356a) is the largest, and the number of second spacer connecting parts (356b) is the smallest. Some rows and some columns in the first support (350b) may include only the first spacer connecting part (356a).In the first support (350b), another row may include only the first spacer coupling part (356a) and the second spacer coupling part (356b). In this case, a plurality of first spacer coupling parts (356a) may be provided between two spaced-apart second spacer coupling parts (356b). In yet another row in the first support (350b), another row may include only the first spacer coupling part (356a) and the third spacer coupling part (356c). In this case, a plurality of first spacer coupling parts (356a) may be provided between two spaced-apart third spacer coupling parts (356c). In the first support (350b), another column may include the first spacer coupling part (356a), the second spacer coupling part (356b), and the third spacer coupling part (356c). In a row containing the second spacer coupling part (356b) and the third spacer coupling part (356c), at least two of the third spacer coupling parts (356c) may be positioned adjacently. Two rows containing only the third spacer coupling part (356c) and the first spacer coupling part (356a) may be positioned adjacently. In a row containing the second spacer coupling part (356b) and the third spacer coupling part (356c), one or more first spacer coupling parts (356a) may be provided between the second spacer coupling part (356b) and the third spacer coupling part (356c).

[0090] The second support (360b) may include a grid-shaped second support plate (361). The second support plate (361) may include a plurality of through holes (362). For example, two first extensions extending in the Z-axis direction and two second extensions extending in the X-axis direction may define a single through hole (362). The plurality of through holes (362) may be arranged in multiple numbers along the X-axis and Z-axis, respectively. The second support (360b) may include a plurality of spacers (366) extending from the second support plate (361) in a direction intersecting the second support plate (361). For example, the plurality of spacers (366) may extend from the second support plate (361) in the Y-axis direction. Each spacer (366) may be located at the portion where the first extension and the second extension are connected. Each of the plurality of spacers (366) can be combined with each of the plurality of spacer coupling parts (356). In this embodiment, a bar is completed by combining one spacer (366) and one spacer coupling part (356). Accordingly, a plurality of bars are completed by combining the first support (350b) and the second support (360b) of this embodiment. In the above description, it was explained that the first support (350b) includes the spacer coupling part (356) and the second support (360b) includes the spacer (366); however, conversely, it is also possible for the first support (350b) to include the spacer and the second support (360b) to include the spacer coupling part. In either case, one spacer is combined with one spacer coupling part to form a bar. A plurality of spacers (366) may include some or all of the first spacer (366a), the second spacer (366b), and the third spacer (366c). Hereinafter, an example is described in which a plurality of spacers (366) includes the first spacer (366a), the second spacer (366b), and the third spacer (366c).Some rows and some columns in the second support (360b) may include only the third spacer (366c). Other rows in the second support (360b) may include only the third spacer (366c) and the first spacer (366a). Yet another row in the second support (360b) may include only the third spacer (366c) and the second spacer (366b). Some columns in the second support (360b) may include all of the first spacer (366a), the second spacer (366b), and the third spacer (366c). In a column containing the first spacer (366a) and the second spacer (366b), the first spacer (366a) and the second spacer (366b) may be positioned adjacently. In the second support (360b), the number of rows containing the third spacer (366c) is greater than the number of rows containing the first spacer (366a) and the third spacer (366c). In the second support (360b), the number of rows containing the third spacer (366c) is greater than the number of rows containing the second spacer (366b) and the third spacer (366c). The number of columns containing the third spacer (366c) in the second support (360b) is greater than the number of columns containing the first spacer (366a) to the third spacer (366c).

[0091] FIG. 15 is an enlarged view of part A of FIG. 14, and FIG. 16 is an enlarged view of part B of FIG. 14. FIG. 17 is an enlarged view of part C of FIG. 14, and FIG. 18 is an enlarged view of part D of FIG. 14.

[0092] Referring to FIGS. 14 to 18, the first spacer (366a) of the second support (360b) can be coupled with the first spacer coupling portion (356a) of the first support (350b). A first bar is defined by the coupling of the first spacer (366a) and the first spacer coupling portion (356a). The second spacer (366b) of the second support (360b) can be coupled with the second spacer coupling portion (356b) of the first support (350b). A second bar is defined by the coupling of the second spacer (366b) and the second spacer coupling portion (356a). The third spacer (366c) of the second support (360b) can be coupled with the third spacer coupling part (356c) of the first support (350b). A third bar is defined by the coupling between the third spacer (366c) and the third spacer coupling part (356b). The third spacer (366c) of the second support (360b) can be coupled with the first spacer coupling part (356a) of the first support (350b). A fourth bar is defined by the coupling between the third spacer (366c) and the first spacer coupling part (356a). That is, in this embodiment, four types of bars can be defined by the coupling of the first support (350b) and the second support (360b). In the description of FIGS. 14 to 18, "length" means the length in the arrangement direction of the first support plate (351) and the second support plate (361).

[0093] Meanwhile, the support (30b) may include a first sheet (32s1), a second sheet (32s2) spaced apart from the first sheet (32s1), and a third sheet (32s3) spaced apart from the second sheet (32s2). The first sheet (32s1) to the third sheet (32s1) are arranged spaced apart in the Y-axis direction, with the first sheet (32s1) positioned closest to the first support plate (351) and the third sheet (32s3) positioned closest to the second support plate (361). The second sheet (32s2) is positioned between the first sheet (32s1) and the third sheet (32s3).

[0094] A first bar is illustrated in FIG. 15. Referring to FIG. 15, the first spacer (366a) can be coupled to the first spacer coupling portion (356a) by penetrating the first holes (32s11, 32s21, 32s31) formed in each of the plurality of sheets (32s1, 32s2, 32s3). When the first spacer (366a) is coupled to the first spacer coupling portion (356a), the first spacer (366a) supports the first sheet (32s1). On the other hand, the first spacer (366a) and the first spacer coupling portion (356a) are spaced apart from the second sheet (32s2) and the third sheet (32s3). Accordingly, the first bar supports the first sheet (32s1) and does not support the second sheet (32s2) and the third sheet (32s3). The length of the first spacer (366a) is longer than the length of the first spacer coupling part (356a). A portion of the first spacer (366a) may be inserted into the first spacer coupling part (356a). For example, the first spacer coupling part (356a) may be formed in a cylindrical shape. The outer diameter (Db1) of the first spacer coupling part (356a) may be larger than the maximum value (Dc3) of the outer diameter of the first spacer (366a). The outer diameter (Db1) of the first spacer coupling part (356a) may decrease as it moves away from the first support plate (351). The inner diameter (Db3) of the first spacer coupling part (356a) may be the same as the diameter of a part of the first spacer (366a). In order for the first spacer (366a) to be easily inserted into the first spacer coupling part (356a), the diameter (Db2) of the inlet of the first spacer coupling part (356a) may be larger than the inner diameter (Db3) of the first spacer coupling part (356a). That is, the inner diameter of a part of the inner surface of the first spacer coupling part (356a) may increase as it approaches the inlet side. Due to this change in inner diameter, a part of the inner surface of the first spacer coupling part (356a) is inclined by a first angle with respect to the vertical line (the line in the Y-axis direction of FIG. 13).Due to the shape design of the first spacer coupling portion (356a) described above, the mold can be easily separated from the first spacer coupling portion (356a) during the injection molding process of the first support (350b). The first spacer (366a) may include a second portion (366a2) extending from the second support plate (361) and a first portion (366a1) extending from the second portion (366a2) and having a diameter smaller than the diameter of the second portion (366a2). A step portion (366a3) may be formed between the first portion (366a1) and the second portion (366a2) due to the difference in diameter between the first portion (366a1) and the second portion (366a2). The length of the second portion (366a2) is formed to be longer than the length of the first portion (366a1). The length of the first part (366a1) is longer than the length of the first spacer coupling part (356a). The first part (366a1) can be press-fitted into the first spacer coupling part (356a). When the first part (366a1) is inserted into the first spacer coupling part (356a), the first spacer coupling part (356a) can be spaced apart from the stepped part (366a3). In the second part (366a2), the diameter (Dc2) (minimum diameter) at a point adjacent to the first part (366a1) is smaller than the diameter (Dc3) (maximum diameter) at a point adjacent to the second support plate (361). For example, the diameter of the second part (366a2) can decrease as it approaches the first spacer coupling part (356a). Due to the change in diameter of the second part (366a2), the outer surface of the second part (366a2) is inclined by a second angle with respect to the vertical line (the extension line in the Y direction of FIG. 13). At this time, the second angle is smaller than the first angle. The diameter (Dc2) of the point adjacent to the first part (366a1) in the second part (366a2) is larger than the diameter (Dc1) of the first part (366a1).The diameter of the first part (366a1) may decrease as it moves further away from the second part (366a2) overall. Alternatively, the first part (366a1) may include a first part whose diameter decreases as it moves further away from the second part (366a2), and a second part that extends from the first part and has a constant diameter. In this case, the second part may be coupled to the first spacer coupling part (356a). The rate of diameter reduction in the section where the diameter varies in the first part (366a1) may be smaller than the rate of diameter reduction in the section where the diameter varies in the second part (366a2). Alternatively, the diameter of the first part (366a1) may be constant overall. Due to this shape design of the first spacer (366a), the mold can be easily separated from the first spacer (366a) during the injection molding process of the second support (360b). In the second part (366a2), the diameter (Da2) at the point adjacent to the first part (366a1) is larger than the inner diameter (Db3) of the first spacer coupling part (356a). Additionally, the diameter of the first hole (32s11) of the first sheet (32s1) is larger than the diameter (Dc1) of the first part (366a1) and smaller than the minimum diameter (Dc2) of the second part (366a2). Therefore, the stepped portion (366a3) of the first spacer (366a) can support the first sheet (32s1). At this time, the first sheet (32s1) can come into contact with the first spacer coupling part (356a). In this embodiment, the portion in contact with the first sheet (32s1) can be described as supporting the first sheet (32s1). For example, the surface facing the second support plate (361) from the first spacer coupling portion (356a) and the stepped portion (366a3) of the first spacer (366a) can support the first sheet (32s1). At this time, the area of ​​the surface where the first spacer (366a) supports the first sheet (32s1) may be different from the area of ​​the surface where the first spacer coupling portion (356a) supports the first sheet (32s1).For example, the support area of ​​the longer one between the first spacer (366a) and the first spacer coupling part (356a) may be smaller than the support area of ​​the shorter one. In this case, heat conduction in the direction penetrating the first bar can be reduced. Specifically, the surface area of ​​the first spacer coupling part (356a) supporting the first sheet (32s1) is larger than the surface area of ​​the first spacer (366a) supporting the first sheet (32s1). When the first spacer (366b) passes through the first sheet (32s1) and is coupled with the first spacer coupling part (356a), the contact area of ​​the first spacer coupling part (356a) with the first sheet (32s1) is large, so the bending phenomenon of the first sheet (32s1) can be minimized. Although not limited, the difference between the outer diameter (Db1) and the inner diameter (Db2) of the inlet side of the first spacer coupling part (356a) may be smaller than the diameter (Dc1) of the first part (366a1) and larger than 1 / 3 of the diameter (Dc1) of the first part (366a1). Due to this structure, the shape of the first spacer coupling part (356a) is maintained during the injection process of the first support (350b), and strength can be secured above a certain level. The diameter of the first holes (32s21, 32s31) of the second sheet (32s2) and the third sheet (32s3), respectively, is larger than the maximum diameter (Dc3) of the second part (366a2). Accordingly, the second sheet (32s2) and the third sheet (32s3) are spaced apart from the first spacer (366a). In this way, when the second sheet (32s2) and the third sheet (32s3) are spaced apart from the first bar in addition to the first sheet (32s1) supported by the first bar, heat conduction between the first bar and the second sheet (32s2) and between the first bar and the third sheet (32s3) can be prevented. The length and outer diameter (Db1) of the first spacer coupling portion (356a) may be greater than the thickness of the first support plate (351) (which is the length in the Y-axis direction of FIG. 13).The length and diameter (Dc3) of the first spacer (366a) may be greater than the thickness (length in the Y-axis direction of FIG. 13) of the second support plate (361). The diameter (Dc1) of the first part (366a1) may be greater than the thickness of the second support plate (361).

[0095] The boundary between the first spacer joint (356a) and the first support plate (351) may be rounded. The end circumference of the first part (366a1) may be rounded. The boundary between the first part (366a1) and the stepped part (366a3) may be rounded. The boundary between the first spacer (366a) and the second support plate (361) may be rounded. The radius of curvature (R4) of the boundary between the first spacer joint (356a) and the first support plate (351) may be the same as or similar to the radius of curvature (R2) of the end circumference of the first part (366a1). The radius of curvature (R2) around the end of the first part (366a1) may be larger than the radius of curvature (R1) at the boundary between the first part (366a1) and the step portion (366a3). The radius of curvature (R3) at the boundary between the first spacer (366a) and the second support plate (361) may be larger than the radius of curvature (R4) at the boundary between the first spacer coupling portion (356a) and the first support plate (351). The radius of curvature (R3) at the boundary between the first spacer (366a) and the second support plate (361) may be at least twice the radius of curvature (R4) at the boundary between the first spacer coupling portion (356a) and the first support plate (351).

[0096] A second bar is illustrated in FIG. 16. Referring to FIG. 16, the second spacer (366b) can be coupled to the second spacer coupling portion (356b) by penetrating the second holes (32s12, 32s22, 32s32) formed in each of the plurality of sheets (32s1, 32s2, 32s3). When the second spacer (366b) is coupled to the second spacer coupling portion (356b), the second spacer (366b) supports the second sheet (32s2). On the other hand, the second spacer (366b) and the second spacer coupling portion (356b) are spaced apart from the first sheet (32s1) and the third sheet (32s3). Accordingly, the second bar supports the second sheet (32s2) and does not support the first sheet (32s1) and the third sheet (32s3). The length of the second spacer (366b) is longer than the length of the second spacer coupling part (356b). A portion of the second spacer (366b) may be inserted into the second spacer coupling part (356b). For example, the second spacer coupling part (356b) may be formed in a cylindrical shape. The outer diameter (Dd1) of the second spacer coupling part (356b) may be larger than the maximum diameter (De3) of the second spacer (366b). The outer diameter (Dd1) of the second spacer coupling part (356b) may decrease as it moves away from the first support plate (351). The inner diameter (Dd3) of the second spacer coupling part (356b) may be the same as the diameter of a part of the second spacer (366b). In order for the second spacer (366b) to be easily inserted into the second spacer coupling part (356b), the diameter (Dd2) of the inlet of the second spacer coupling part (356b) may be larger than the inner diameter (Dd3) of the second spacer coupling part (356b). That is, the inner diameter of a part of the inner surface of the second spacer coupling part (356b) may increase as it approaches the inlet side. Due to this change in inner diameter, a part of the inner surface of the second spacer coupling part (356b) is inclined by a third angle with respect to the vertical line (the line in the Y-axis direction of FIG. 13).Due to the shape design of the second spacer coupling portion (356b) described above, the mold can be easily separated from the second spacer coupling portion (356b) during the injection molding process of the first support (350b). The second spacer (366b) may include a second portion (366b2) extending from the second support plate (361) and a first portion (366b1) extending from the second portion (366b2) and having a diameter smaller than the diameter of the second portion (366b2). A step portion (366b3) may be formed between the first portion (366b1) and the second portion (366b2) due to the difference in diameter between the first portion (366b1) and the second portion (366b2). The length of the second portion (366b2) is formed to be shorter than the length of the first portion (366b1). The length of the first part (366b1) is longer than the length of the second spacer coupling part (356b). The first part (366b1) can be press-fitted into the second spacer coupling part (356b). When the first part (366b1) is inserted into the second spacer coupling part (356b), the second spacer coupling part (356b) can be spaced apart from the stepped part (366b3). The diameter (De2) (minimum diameter) at the point adjacent to the first part (366b1) in the second part (366b2) is smaller than the diameter (De3) (maximum diameter) at the point adjacent to the second support plate (361). For example, the diameter of the second part (366b2) can decrease as it approaches the second spacer coupling part (356b). Due to the change in diameter of the second part (366b2), the outer surface of the second part (366b2) is inclined by a fourth angle with respect to the vertical line (the extension line in the Y direction of FIG. 13). At this time, the fourth angle is smaller than the third angle. The fourth angle may be smaller than the second angle. The diameter (De2) of the point adjacent to the first part (366b1) in the second part (366b2) is larger than the diameter (De1) of the first part (366b1).The diameter of the first part (366b1) may decrease as it moves away from the second part (366b2) overall. Alternatively, the first part (366b1) may include a first part whose diameter decreases as it moves away from the second part (366b2), and a second part that extends from the first part and has a constant diameter. In this case, the second part may be coupled to the second spacer coupling part (356b). Alternatively, the diameter of the first part (366b1) may be constant overall. Due to the shape design of the second spacer (366b) in this way, the mold can be easily separated from the second spacer (366b) during the injection molding process of the second support (360b). The minimum diameter (De2) of the second part (366b2) is greater than the inner diameter (Dd3) of the second spacer coupling part (356b). The minimum diameter (De2) of the second part (366b2) may be equal to, larger than, or smaller than the diameter (Dd2) of the inlet of the second spacer joint (356b). The maximum diameter (De3) of the second part (366b2) is smaller than the outer diameter (Dd1) of the second spacer joint (356b). The diameter of the second hole (32s22) of the second sheet (32s2) is larger than the diameter (De1) of the first part (366b1) and smaller than the minimum diameter (De2) of the second part (366b2). Therefore, the stepped portion (366b3) of the second spacer (366b) can support the second sheet (32s2). The diameter of the second holes (32s22, 32s32) of the first sheet (32s1) and the third sheet (32s3), respectively, is larger than the outer diameter (Dd1) of the second spacer coupling part (356b). Accordingly, the first sheet (32s1) and the third sheet (32s3) are spaced apart from the second spacer (366b) and the second spacer coupling part (356b).In this way, when the first sheet (32s1) and the third sheet (32s3) are spaced apart from the second bar in addition to the second sheet (32s2) supported by the second bar, heat conduction between the second bar and the first sheet (32s1) and between the second bar and the third sheet (32s3) can be prevented. The length and outer diameter (Dd1) of the second spacer coupling portion (356b) may be greater than the thickness of the first support plate (351). The length and diameter (De3) of the second spacer (366b) may be greater than the thickness of the second support plate (361). The diameter (De1) of the first portion (366b1) may be greater than the thickness of the second support plate (361).

[0097] A third bar is illustrated in FIG. 17. Referring to FIG. 17, the third spacer (366c) can be coupled to the third spacer coupling portion (356c) by penetrating the third holes (32s13, 32s23, 32s3) formed in each of the plurality of sheets (32s1, 32s2, 32s3). When the third spacer (366c) is coupled to the third spacer coupling portion (356c), the third spacer (366c) supports the third sheet (32s3). On the other hand, the third spacer (366c) and the third spacer coupling portion (356c) are spaced apart from the first sheet (32s1) and the second sheet (32s2). Accordingly, the third bar supports the third sheet (32s3) and does not support the first sheet (32s1) and the second sheet (32s2). The length of the third spacer (366c) is longer than the length of the third spacer coupling part (356c). A portion of the third spacer (366c) may be inserted into the third spacer coupling part (356c). For example, the third spacer coupling part (356c) may be formed in a cylindrical shape. The outer diameter of the third spacer coupling part (356c) may be larger than the maximum diameter of the third spacer (366c). The outer diameter of the third spacer coupling part (356c) may decrease as it moves away from the first support plate (351). The inner diameter of the third spacer coupling part (356c) may be the same as the diameter of a part of the third spacer (366c). In order for the third spacer (366c) to be easily inserted into the third spacer coupling part (356c), the diameter of the inlet of the third spacer coupling part (356c) may be larger than the inner diameter of the third spacer coupling part (356c). That is, the inner diameter of a part of the inner surface of the third spacer coupling part (356c) may increase as it approaches the inlet side. Due to this change in inner diameter, a part of the inner surface of the third spacer coupling part (356c) is inclined by a fifth angle with respect to the vertical line (the line in the Y-axis direction of FIG. 13).Due to the shape design of the third spacer coupling part (356c) described above, the mold can be easily separated from the third spacer coupling part (356c) during the injection molding process of the first support (350b). The third spacer (366c) may be formed such that its diameter decreases as it moves away from the second support plate (361) overall. A portion of the third spacer (366c) may be press-fitted into the third spacer coupling part (356b). Alternatively, the third spacer (366c) may include a first part whose diameter decreases as it moves away from the second support plate (361), and a second part that extends from the first part and has a constant diameter. In this case, the second part may be press-fitted into the third spacer coupling part (356c). Due to the shape design of the third spacer (366c) described above, the mold can be easily separated from the third spacer (366c) during the injection molding process of the second support (360b). Due to the change in the diameter of the third spacer (366c), the outer surface of the third spacer (366c) is inclined by a sixth angle with respect to the vertical line (the extension line in the Y direction of FIG. 13). At this time, the sixth angle is smaller than the fifth angle. The sixth angle may be smaller than the fourth angle. The maximum diameter of the third spacer (366c) may be smaller than the maximum diameter of the first spacer (366a). The maximum diameter of the second spacer (366b) may be larger than the maximum diameter of the first spacer (366a). The diameter of the third hole (32s33) of the third sheet (32s3) is larger than the minimum diameter of the third spacer (366c) and smaller than the maximum diameter. At this time, the diameter of the third hole (32s33) of the third sheet (32s3) is similar to the maximum diameter of the third spacer (366c). Therefore, the third sheet (32s3) can be supported by the outer surface of the third spacer (366c) at a location adjacent to the second support plate (361).The diameter of the third hole (32s13, 32s23) of the first sheet (32s1) and the second sheet (32s2), respectively, is larger than the outer diameter of the third spacer coupling part (356c). Accordingly, the first sheet (32s1) and the second sheet (32s2) are spaced apart from the third spacer (366c) and the third spacer coupling part (356c). In this way, when the first sheet (32s1) and the second sheet (32s2) are spaced apart from the third bar in addition to the third sheet (32s3) supported by the third bar, heat conduction between the third bar and the first sheet (32s1) and between the third bar and the second sheet (32s2) can be prevented. The length and outer diameter of the third spacer coupling portion (356c) may be greater than the thickness of the first support plate (351). The length and diameter of the third spacer (366c) may be greater than the thickness of the second support plate (361).

[0098] A fourth bar is illustrated in FIG. 18. Referring to FIG. 18, the third spacer (366c) can be coupled to the first spacer coupling part (356a) by penetrating the fourth hole (32s14, 32s24, 32s34) formed in each of the plurality of sheets (32s1, 32s2, 32s3). When the third spacer (366c) is coupled to the first spacer coupling part (356a), the third spacer (366c) does not support the first to third sheets (32s1, 32s2, 32s3). That is, the third spacer (366c) and the first spacer coupling part (356a) are spaced apart from the first sheet (32s1) to the third sheet (32s3). Accordingly, the fourth bar does not support the first to third sheets (32s1, 32s2, 32s3). The diameter of the fourth hole (32s14, 32s24, 32s34) of the first to third sheets (32s1, 32s2, 32s3) is larger than the outer diameter of the first spacer coupling part (356a). Since the structure of the third spacer (366c) and the first spacer coupling part (356a) has been previously described, a detailed description is omitted.

[0099] FIG. 19 is a bottom view of the second support, FIG. 20 is a cross-sectional view taken along 20-20 of FIG. 19, and FIG. 21 is a cross-sectional view taken along 21-21 of FIG. 19.

[0100] Referring to FIGS. 19 to 21, the first support (350b) and the second support (360b) can be injection molded as described above. Each of the supports (350b, 360b) may be formed from, for example, a material of PPS (Poly Phenylene Sulfide). In this case, the PPS of the present embodiment may not have a lubricant added to reduce the pressure rise rate and may contain only a hydrolysis inhibitor to reduce outgassing. In the case of the present embodiment, the support may further include GF (Glass Fiber). The first support (350b) can be manufactured by producing a first mold having a first space for producing the first support (350b), and then injecting an injection liquid into the first space and curing it. Likewise, the second support (360b) can be manufactured by producing a second mold having a second space for creating the second support (360b), and then injecting and curing the injection liquid into the second space. As such, since the spacer coupling part of the first support (350b) and the spacer of the second support (360b) are important components for maintaining the shape of the vacuum space, they must be manufactured with accurate dimensions, and the dimensional tolerances of the spacer coupling part or the spacers must be minimized. To this end, in this embodiment, a configuration for injecting and distributing the injection liquid in each mold forming the first support (350b) and the second support (360b) can be placed at a position spaced apart from the spacer or the spacer coupling part. For example, a mold gate for injecting injection liquid in each of the above molds may be positioned at a location corresponding to the through hole (352, 362) in each of the above supports (350b, 360b). When the mold gate is positioned at a location corresponding to the through hole (352, 362), the mold may include a mold distribution section for distributing the injection liquid injected through the mold gate to the first space or the second space, and a mold bridge for connecting the mold distribution section to the first space and the second space.If a mold gate for injecting injection fluid is positioned at a location corresponding to a spacer (366) or a spacer coupling part (356) in the mold, there may be a disadvantage in that there is a large height tolerance between the spacer or spacer coupling part formed at a location corresponding to the mold gate and the spacer or spacer coupling part formed at a location not corresponding to the mold gate. On the other hand, according to the present invention, this problem can be resolved.

[0101] After the injection of the injection liquid is completed and the mold is removed, the first support (350b) and the second support (360b) include a support gate, a support distribution section, and a support bridge in correspondence with the mold gate, the mold distribution section, and the mold bridge. Hereinafter, the support gate, the support distribution section, and the support bridge will be collectively referred to as a distribution structure (369). However, the support gate is omitted in FIG. 19. Since the shape of the distribution structure (369) is identical to the first support (350b) and the second support (360b), and the position of the distribution structure (369) may be identical to or symmetrical to the first support (350b) and the second support (360b), hereafter only the distribution structure (369) and the grid shape formed on the second support (360b) will be described. Each of the first support (350b) and the second support (360b) may be combined with the distribution structure (369) with part or all of it removed, or with the distribution structure (369) not removed. The distribution structure (369) may include a support distribution section (368) and a plurality of support bridges (367) extending radially from the support distribution section (368). The support distribution section (368) may be located in a through hole (362). A through hole (362) may be defined by a pair of parallel first extension sections (361a1) and a pair of second extension sections (361s2) perpendicular to the pair of first extension sections (361a1) and parallel to each other. Since each end of the pair of second extensions (361a2) is connected to each end of the pair of first extensions (361a1), the pair of first extensions (361a1) and the pair of second extensions (361a2) can form a substantially rectangular through hole (362). Each spacer (366) can be placed at the connection point between each of the pair of first extensions (361a1) and each of the pair of second extensions (361a2).Accordingly, the support distribution section (368) is spaced apart from the spacer (366). The support distribution section (368) may be formed in the shape of a disc, for example. A plurality of support bridges (367) may be arranged symmetrically with respect to the support distribution section (368), for example. For example, two support bridges may be connected to each of the pair of first extension sections (361a1) or to each of the pair of second extension sections (361a2). Alternatively, four support bridges (367) may be extended from the support distribution section (368) and connected to each of the extension sections (361a1, 361a2) so that the injection liquid can be easily distributed to each of the pair of first extension sections (361a1) and the pair of second extension sections (361a2). For example, four support bridges (367) can be arranged at 90-degree intervals. In this case, the injection liquid can flow uniformly into the space corresponding to each extension within the mold, thereby improving injection uniformity.

[0102] Meanwhile, the length (L1) of each of the first extension parts (361a1) may differ from the length (L2) of each of the second extension parts (361a2). For example, the length (L1) of each of the first extension parts (361a1) may be longer than the length (L2) of each of the second extension parts (361a2).

[0103] Referring to FIG. 20, the first extension (361a1) may include a first surface (361a11) and a second surface (361a12) that are substantially parallel. The spacer (366) may be provided on the second surface (361a12). The first surface (361a11) may be in contact with the outer case (210). The distance (distance in the Y-axis direction) between the first surface (361a11) and the second surface (361a12) may be called the thickness (t1). At this time, the length (a1) of the first surface (361a11) may be longer than the length (a2) of the second surface (361a12). Due to the difference in length between the first surface (361a11) and the second surface (361a12) and the structure in which the spacer (366) is provided on the second surface (361a12), the mold can be easily separated from the second support (360b) after injection molding is completed.

[0104] Referring to FIG. 21, the second extension (361a2) may include a first surface (361a21) and a second surface (361a22) that are substantially parallel. The spacer (366) may be provided on the second surface (361a22). The first surface (361a21) may be in contact with the outer case (210). The distance (distance in the Y-axis direction) between the first surface (361a21) and the second surface (361a22) may be called the thickness (t2). At this time, the length (a3) ​​of the first surface (361a21) may be longer than the length (a4) of the second surface (361a22). Due to the difference in length between the first surface (361a21) and the second surface (361a22) and the structure in which the spacer (366) is provided on the second surface (361a22), the mold can be easily separated from the second support (360b) after injection molding is completed. The length (a3) ​​of the first surface (361a21) of the second extension part (361a2) may differ from the length (a1) of the first surface (361a11) of the first extension part (361a1). For example, the length (a3) ​​of the first surface (361a21) of the second extension part (361a2) may be greater than the length (a1) of the first surface (361a11) of the first extension part (361a1). The length (a4) of the second surface (361a22) of the second extension part (361a2) may be different from the length (a2) of the second surface (361a12) of the first extension part (361a1). For example, the length (a4) of the second surface (361a22) of the second extension part (361a2) may be greater than the length (a2) of the second surface (361a12) of the first extension part (361a1).

[0105] The hydraulic diameter of the first extension (361a1) and the hydraulic diameter of the second extension (361a1) may be different. The hydraulic diameter of the second extension (361a1) may be larger than the hydraulic diameter of the first extension (361a2). The hydraulic diameter refers to a value converted to the diameter of a circular pipe using the lengths of the major and minor sides of a rectangular pipe or duct. The hydraulic diameter may also be called the hydraulic cross-sectional diameter. The hydraulic diameter is proportional to the area and inversely proportional to the perimeter. For example, in a rectangular duct with sides a and b, the hydraulic diameter can be calculated as 2ab / (a+b). The length relationship between the first extension and the second extension of the second support (360b), the cross-sectional shape, the difference in length between the first and second surfaces on the cross-section, and the difference in hydraulic diameter between the first extension and the second extension of the second support can be applied equally to the second support (350b).

[0106] Figure 22 is a graph showing the forming rate according to the grid hydraulic diameter.

[0107] Referring to Fig. 22, the horizontal axis represents the hydraulic diameter of the grid, the vertical axis on the left represents the forming rate, and the vertical axis on the right represents the pressure rise rate. It can be seen that as the hydraulic diameter of the grid increases up to a certain size, the forming rate increases, and once it exceeds that size, the forming rate becomes constant. It can be seen that as the hydraulic diameter of the grid increases, outgassing increases.

[0108] Although it is preferable for the outgassing to be low, securing the molding rate must be prioritized; therefore, in this embodiment, the hydraulic diameter (first extension part and second extension part) of the grid may be 1 or greater. In this case, at least 95 percent of the molding rate can be secured. The hydraulic diameter may be 2.5 or less. As the outgassing increases, the vacuum holding period may decrease, and when the hydraulic diameter is approximately 2.5, the vacuum holding period may be approximately 10 years or more. When the hydraulic diameter is approximately 2, the vacuum holding period may be 15 years or more. When the hydraulic diameter is 1 or greater, the vacuum holding period may be 20 years or more. When additionally considering the vacuum holding period in this embodiment, the hydraulic diameter may be 2.5 or less. Therefore, the hydraulic diameter may be, for example, 1 or greater and 2.5 or less. In order to extend the vacuum holding period, in this embodiment, the hydraulic diameter may be 1 or greater and 2.0 or less. In order to secure a higher molding rate and extend the vacuum holding period, it may be preferable that the hydraulic diameter of the grid be 1.25 or higher and 2.0 or lower.

[0109] FIGS. 23 to 28 are drawings showing injection time, injection pressure, and temperature according to the thickness of the grid and the length of the spacer.

[0110] Referring to FIGS. 23 to 28, the first support (350b) and the second support (360b) can be injection molded as described above. The thickness of the grid and the length of the spacer can be considered so that the supports can be injection molded using a general injection molding machine and can be molded repeatedly. Generally, when injection molding, it is preferable for the injection time (fill time) of the injection liquid to be fast, the temperature of the injection liquid to have a low high temperature (hereinafter referred to as the maximum temperature), and the injection pressure to be low.

[0111] Comparing FIGS. 23, 24, and 25, when the thickness of the grid is constant, the range of variation in injection time, pressure, and maximum temperature is not large even when the length of the spacer is varied. On the other hand, referring to FIGS. 23, 26, 27, and 28, as the thickness of the grid increases, the magnitude of the high pressure in the injection pressure may decrease and the maximum temperature may decrease. In this embodiment, it may be preferable that the injection time of the first support (350b) and the second support (360b) be 1.35 seconds or less. The thickness of the grid may be set to 1.2t or more and 1.5t or less. The temperature range may be 318 degrees or less and 193 degrees or more.

[0112] FIGS. 29 to 33 are drawings showing injection time, injection pressure, and temperature according to the hydraulic diameter of the grid and the length of the spacer.

[0113] In the drawing, hydraulic section 1 refers to the hydraulic diameter of the first extension, and hydraulic section 2 refers to the hydraulic diameter of the second extension.

[0114] Referring to FIGS. 29 to 33, the injection pressure can be reduced as the hydraulic cross-section increases. In order to increase injection reproducibility in a general injection molding machine, injection molding must be performed at a pressure lower than the injection limit pressure of 180 MPa. Based on experimental results, it is preferable that the first extension and the second extension in the grid each have a diameter of 1.5 or more so that the injection pressure is approximately 80% or less of the injection limit pressure, and it is even more preferable that at least one hydraulic diameter of the first extension and the second extension in the grid each have a diameter of 1.62 or more.

[0115] Figure 34 is a graph showing the molding rate according to the grid area ratio.

[0116] Referring to FIG. 19 and FIG. 34, a single grid can form a single through hole. The grid area ratio refers to the percentage (in % units) of the total area of ​​a square connecting the center lines of a pair of first extensions (361a1) and a pair of second extensions (361a2) in a single grid, excluding the area of ​​the through hole (362) from the total area of ​​the square. The horizontal axis represents the grid area ratio, the vertical axis on the left represents the forming rate, and the vertical axis on the right represents the pressure rise rate.

[0117] It can be seen that as the area ratio of the grid increases up to a certain size, the molding rate increases, and beyond that size, the molding rate becomes constant. It can be seen that as the area ratio of the grid increases, outgassing increases. Although low outgassing is desirable, securing the molding rate must be prioritized; therefore, in this embodiment, the grid area ratio may be 10% or more. As outgassing increases, the vacuum holding period may decrease, and when the grid area ratio is approximately 43%, the vacuum holding period may be approximately 10 years or more. When the grid area ratio is approximately 28%, the vacuum holding period may be 15 years or more. When the grid area ratio is approximately 12%, the vacuum holding period may be 20 years or more. When additionally considering the vacuum holding period in this embodiment, the grid area ratio may be 43% or less. To increase the vacuum holding period, the grid area ratio may be 10% or more and 28% or less. To secure a higher molding rate, the grid area ratio may be 15% or more and 43% or less. In order to secure a higher molding rate and extend the vacuum holding period, it may be desirable for the grid area ratio to be 15% or more and 28% or less. Meanwhile, considering the grid area ratio, the number of through holes formed per square meter may be 30 or more and 90 or less. The number of through holes formed per square meter may be 40 or more and 75 or less.

Claims

Claim 1 A vacuum insulator comprising: a first plate; a second plate; a vacuum space provided between the first plate and the second plate; and a support maintaining the vacuum space, wherein the support comprises: a second support plate formed in a grid shape; and a second support protruding from the second support plate and having a plurality of spacers; wherein the second support plate comprises a plurality of through holes, and one through hole is defined by an extension, wherein the extension comprises a first surface, a second surface, and a side connecting the first surface and the second surface substantially parallel to the through hole, and the hydraulic diameter defined by the first surface, the second surface, and the side of the extension is 1 or greater and 2.5 or less. Claim 2 A vacuum insulator according to claim 1, wherein the hydraulic diameter of the extension is 1 or more and 2 or less. Claim 3 A vacuum insulation body according to claim 1, wherein the hydraulic diameter of the extension is 1.25 or more and 2.5 or less. Claim 4 In claim 3, the vacuum insulation body having a hydraulic diameter of the extension part of 1.25 or more and 2.0 or less. Claim 5 In claim 1, the extension part comprises a first extension part and a second extension part intersecting the first extension part, and the length of the first extension part is different from the length of the second extension part, forming a vacuum insulation body. Claim 6 In claim 1, the extension part comprises a first extension part and a second extension part intersecting the first extension part, and the hydraulic diameter of the first extension part is different from the hydraulic diameter of the second extension part, forming a vacuum insulation body. Claim 7 In claim 1, the extension part includes a first extension part and a second extension part intersecting the first extension part, and each of the first extension part and the second extension part includes the first surface and the second surface, and a spacer is provided on the second surface, and the length of the second surface is longer than the length of the first surface, a vacuum insulation body. Claim 8 In claim 1, the support comprises a first support plate formed in a grid shape and a first support having a plurality of spacer coupling portions protruding from the first support plate; wherein the first support plate comprises a plurality of through holes, and one through hole is a vacuum insulation body defined by an extension portion. Claim 9 In claim 8, a vacuum insulation body comprising a sheet spaced apart from one or more of the first support plate and the second support plate. Claim 10 In claim 9, the sheet comprises a portion having a deformation resistance smaller than at least one of the first plate, the second plate, and the support, forming a vacuum insulation body. Claim 11 In claim 8, the plurality of spacers are coupled to each of the plurality of spacer coupling parts to form a plurality of bars together with the plurality of spacer coupling parts, forming a vacuum insulation body. Claim 12 A vacuum insulation body according to claim 1, wherein the number of through holes formed per square meter is 30 or more and 90 or less. Claim 13 A vacuum insulation body according to claim 12, wherein the number of through holes formed per square meter is 40 or more and 75 or less. Claim 14 An apparatus comprising a vacuum insulation body according to any one of claims 1 to 13. Claim 15 delete Claim 16 delete

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