JP6083939B2 - Vacuum insulation panel and insulation box - Google Patents

Description

  The present invention relates to a vacuum heat insulation panel in which an internal space of a hollow panel is evacuated, and a heat insulation box configured using the vacuum heat insulation panel.

  Thermal insulation panels are used in housings such as refrigerators and cold storage containers, and wall materials for air transport containers. 2. Description of the Related Art Conventionally, a heat insulating panel in which a heat insulating material such as urethane foam or polystyrene is embedded between a pair of side plates is known. However, when producing a heat insulating panel using these heat insulating materials, a very thick heat insulating material is required to obtain sufficient heat insulating properties.

  Further, a technique for improving the heat insulating property of the hollow panel by evacuating the internal space of the hollow panel is conventionally known. Such a heat insulation panel is called a vacuum heat insulation panel. According to the vacuum heat insulation panel, the heat insulation can be improved as compared with the case where only the heat insulating material is used. However, in the vacuum heat insulation panel, the side plates are deformed due to the difference between the atmospheric pressure and the atmospheric pressure in the internal space, the side plates come into contact with each other, and heat may be directly conducted between the side plates. For this reason, it is desirable to provide the vacuum heat insulation panel with a reinforcing means for suppressing such deformation.

  For example, in the technique of Patent Document 1, deformation of the vacuum heat insulating panel is suppressed by laminating steel plates having unevenness.

Japanese Unexamined Patent Publication No. 2005-114028 (column [0015], FIG. 1, etc.)

  However, since the technique of Patent Document 1 uses a plurality of steel plates, there is a drawback that the weight of the vacuum heat insulating panel is increased.

  In addition, since heat is conducted between the two side plates via these steel plates, there is a drawback that the heat insulating property of the vacuum heat insulating panel is deteriorated.

  Furthermore, since such steel plates are laminated, there is a disadvantage that the vacuum heat insulation panel cannot be made sufficiently thin. For example, a case where a shipping container is manufactured using such a vacuum heat insulating panel can be considered, but the outer dimensions of the shipping container are often defined in advance. Therefore, the thicker the vacuum heat insulation panel, the smaller the internal volume and the load capacity decreases.

  In view of such circumstances, a first object of the present invention is to provide a vacuum heat insulation panel that is light and thin and excellent in heat insulation. The second object is to provide a heat insulation box using such a vacuum heat insulation panel.

In order to achieve such an object, the invention described in claim 1 includes a sealed space formed by using a pair of side plates disposed opposite to each other by a predetermined distance and a frame member that closes a peripheral portion of these side plates. In this sealed space, the pair of side plates is brought into contact with an inner plate disposed substantially parallel to the pair of side plates and an inner surface of at least one of the side plates, due to a pressure difference between inside and outside of the sealed space. In order to suppress deformation, a vacuum heat insulation panel having a plurality of protrusions provided on the inner plate, wherein at least one of the side plates is formed of glass, and the frame member has a cross section is formed in a U-shape, has a both end portions of the U-shaped that will be connected to an end of the pair of side plates, at a portion other than the both end portions and a protrusion protruding into the sealed space side, the Only both ends touch each side plate Serial protrusions are spaced apart and each of the side plates, characterized in that the respective vacuum insulation panels are configured so that a gap is generated between the protruding portion and the side plates.
The invention according to claim 2 is characterized in that, in addition to the configuration according to claim 1, the pair of side plates are supported such that convex portions abut against the projecting portions of the frame member. .

The invention according to claim 3, in addition to the configuration according to claim 1 or 2, wherein the protrusions are arranged in a state of being inserted into a through hole provided in said plate, each end portions It is in contact with each inner surface of the pair of side plates.

According to a fourth aspect of the present invention, in addition to the structure according to any one of the first to third aspects , at least a part of the frame member is formed of glass.

According to a fifth aspect of the present invention, in addition to the configuration according to the third or fourth aspect , each of the protrusions has a substantially conical shape at each end portion that abuts against the side plate.

According to a sixth aspect of the present invention, in addition to the configuration according to any one of the first to fifth aspects, the protruding portion is provided with a fixing means for fixing the protruding portion to the inner plate. It is characterized by.

The invention described in Claim 7, in addition to the configuration of any one of claims 1 to 6, wherein the protrusion is characterized by being formed of glass or ceramic.

The invention described in claim 8 is characterized in that the heat insulating box is configured by using the vacuum heat insulating panel according to any one of claims 1 to 7 .

According to the invention described in claim 1, vacuum insulation panels, oppositely disposed pair of side plates and sealed space formed by using a frame member for closing the periphery of the side plates, in between tight closed space this In order to suppress the deformation of the pair of side plates due to the pressure difference between the inside and outside of the sealed space by contacting the inner plate disposed substantially parallel to the pair of side plates and the inner surface of at least one of the side plates, Since it has the some projection part provided in the inner plate, the vacuum heat insulation panel which was lightweight and thin and excellent in heat insulation can be provided.

Moreover, since at least one of the side plates is made of a material having a lower thermal conductivity than that of glass, that is, a metal such as stainless steel, the heat insulating property of the side plate itself can be enhanced. As a result, it is possible to further improve the heat insulating property of the entire vacuum heat insulating panel.
According to the second aspect of the present invention, since the convex portions of the pair of side plates are supported in contact with the projecting portions of the frame material, sufficient reinforcement is provided for the side plates even if the inner plate is formed very thin. It is possible to obtain sufficient strength while reducing the weight of the vacuum heat insulating panel.

According to invention of Claim 4 , since at least one part of a frame material is formed with glass, the heat insulation of this frame material itself can also be improved. As a result, it is possible to further improve the heat insulating property of the entire vacuum heat insulating panel.

According to the fifth aspect of the present invention, the contact area between the protrusion and the side plate is reduced, so that heat conduction between the protrusion and the side plate is suppressed. Therefore, it becomes difficult for heat to be conducted between the two side plates via the protrusions, and the heat insulating property of the vacuum heat insulating panel is further improved.

According to the sixth aspect of the present invention, since the protrusion is fixed to the inner plate by the fixing means, the side plate is deformed by the protrusion even when the vacuum heat insulation panel is used for an application that receives vibration. It becomes possible to maintain the suppression function over a long period of time.

According to invention of Claim 7 , since the projection part is formed with glass or ceramic, the heat insulation of this projection part itself can also be improved. As a result, it is possible to further improve the heat insulating property of the entire vacuum heat insulating panel.

According to invention of Claim 8 , the heat insulation box using the vacuum heat insulation panel which has the effect mentioned above can be provided.

It is a perspective view which shows the vacuum heat insulation panel which concerns on Embodiment 1 of this invention. It is an expanded sectional view which shows the vacuum heat insulation panel which concerns on the same Embodiment 1. It is sectional drawing which shows the attachment state of the projection part of the vacuum heat insulation panel which concerns on the same Embodiment 1. FIG. It is a perspective view which shows the attachment method of the projection part of the vacuum heat insulation panel which concerns on the same Embodiment 1. FIG. It is a perspective view which shows the storage box produced using the vacuum heat insulation panel which concerns on the same Embodiment 1. FIG. It is a figure which shows the blood transport box produced using the vacuum heat insulation panel which concerns on the same Embodiment 1, Comprising: (a) is the perspective view, (b) is the longitudinal cross-sectional view.

Embodiments of the present invention will be described below.
Embodiment 1 of the Invention

  1 to 6 show a first embodiment of the present invention.

In the vacuum heat insulation panel 100 according to Embodiment 1, as shown in FIGS. 1 and 2, a pair of rectangular flat plate-like side plates 101 and 102 are arranged so as to face each other. A rectangular flat plate 110 is disposed between the side plates 101 and 102. Further, four frame members 103 to 106 are arranged along each side of the side plates 101 and 102, and the side plates 101 and 102 and the frame members 103 to 106 are fixedly adhered to each other by welding. Thereby, the sealed space 120 is formed by the side plates 101 and 102 and the frame members 103 to 106. The sealed space 120 is evacuated to a vacuum state (medium vacuum or high vacuum) of 10 ⁻² Pa to 10 ⁻¹ Pa using the exhaust pipe 119.

  Hereinafter, the configuration of the vacuum heat insulation panel 100 will be described in detail.

  The side plates 101 and 102 are both made of glass such as tempered glass. The dimensions of the side plates 101 and 102 were a width of 550 mm, a length of 700 mm, and a thickness of 0.5 mm. Further, a convex portion 107 is formed on the inner surfaces of the side plates 101 and 102, and the convex portion 107 is in contact with the frame member 103.

  As shown in FIG. 2, the three frame members 103, 104, and 105 are all formed in a U-shaped cross-sectional groove shape with glass such as tempered glass having a thickness of 0.5 mm. The frame member 106 is made of stainless steel having a thickness of 0.2 mm and has a groove shape with a stepped U-shaped cross section.

  The inner plate 110 is made of a metal such as aluminum or stainless steel. The dimensions of the inner plate 110 were a width of 500 mm, a length of 650 mm, and a thickness of 0.2 mm. In order to improve heat insulation, the inner plate 110 is disposed so as not to contact the frame members 103 to 106.

The inner plate 110 is provided with a number of circular through holes 111. The diameter of the through hole 111 is, for example, 6 mm. The protrusion 112 is inserted into the through hole 111. As shown in FIG. 3, the protrusion 112 has a small-diameter columnar portion 112a (for example, 2 mm in height and a diameter of 6 mm) and a large-diameter columnar portion 112b (for example, a height of 1 mm and a diameter of 8 mm) on one end surface. Are integrally formed so as to be in contact with each other. Further, the small diameter of the generally conical in diameter on the other end surface of the cylindrical portion 112a leading end portion 112c (e.g., height 3 mm, diameter 6mm) is substantially the other end surface of the cylindrical portion 112 b of the large-diameter large diameter Conical tip portions 112d (for example, 4 mm in height and 8 mm in diameter) are integrally formed. In the present embodiment, these protrusions 112 are held by the inner plate 110 by inserting the small-diameter cylindrical portion 112a and the tip portion 112c into the through hole 111.

  Further, as shown in FIGS. 2 and 3, each circlip 112 is attached with a ring-shaped circlip 114 as an example of a fixing means. The circlip 114 causes the protrusion 112 to be attached to the inner plate 110. It is in a fixed state. In order to fix the protrusion 112 to the inner plate 110 using the circlip 114, first, as shown by a one-dot chain line in FIG. 4, the protrusion 112 is positioned below the through hole 111 of the inner plate 110. After the protrusion 112 is raised and passed through the through-hole 111 from below, the circlip 114 is fitted from above to the cylindrical part 112a of the protrusion 112 protruding upward from the inner plate 110. Then, as shown in FIG. 3, the circlip 114 is locked to both the cylindrical portion 112 a of the protruding portion 112 and the upper surface 110 a of the inner plate 110 so that the protruding portion 112 does not fall out of the through hole 111 of the inner plate 110. It will be in the state fixed to.

  In the sealed space 120, one tip 112 c of the protrusion 112 abuts on the inner surface of the side plate 102 to support the side plate 102, and the other tip 112 d of the protrusion 112 is the inner surface of the side plate 101. To support the side plate 101.

  The protrusion 112 is made of glass or ceramic. Here, for example, the thermal conductivity of stainless steel is about 18 W / mK (W is Watt, m is meter, K is Kelvin), whereas the thermal conductivity of glass is about 0.7 W / mK, The thermal conductivity of ceramic is about 0.6 W / mK.

  The exhaust pipe 119 is used to evacuate the sealed space 120. The type and the like of the exhaust pipe 119 are not limited, but it is desirable to perform a process that can maintain the sealed space 120 in a vacuum state (for example, high vacuum) for a long period of time. For example, the exhaust pipe 119 may have a double pipe structure, a stainless pipe having a diameter of about 10 mm and a length of about 1 mm may be used as the outer pipe, and a copper pipe may be used as the inner pipe. The exhaust pipe 119 was press-bonded after being evacuated, and the exhaust pipe 119 was pressure-bonded, and the outer end of the exhaust pipe 119 was welded. Thereby, the intrusion of atmospheric gas into the sealed space 120 can be prevented, and the sealed space 120 is maintained at a high vacuum, for example.

  FIG. 5 is a perspective view showing a storage box as an example of a heat insulation box produced using the vacuum heat insulation panel 100 of the present embodiment.

  As shown in FIG. 5, the storage box 200 has a substantially regular hexahedron shape and is manufactured using six vacuum heat insulation panels 100. In FIG. 5, only three vacuum heat insulation panels 100-1 to 100-3 are shown.

  As the frame 201, for example, a hard foam resin is used. As shown in FIG. 5, the frame 201 covers the end portions of the two adjacent vacuum heat insulation panels 100 and the vicinity thereof so that the planes of the two vacuum heat insulation panels 100 are perpendicular to each other. Secure to. Thereby, each side of the six vacuum heat insulation panels 100 can be fixed to the other vacuum heat insulation panels 100 adjacent to each other, and the sealed storage box 200 can be manufactured.

  When the cargo is stored in the storage box 200 or when the cargo is taken out from the storage box 200, the vacuum heat insulation panel 100-1 may be removed by pulling the frame body 201 upward.

  FIG. 6 is a view showing a blood transport box as an example of a heat insulation box produced by using the vacuum heat insulation panel 100 of the present embodiment, wherein (a) is a perspective view thereof, and (b) is a longitudinal section thereof. FIG.

  As shown in FIG. 6, the blood transport box 300 has a substantially rectangular parallelepiped box body 301. A substantially rectangular parallelepiped lid 302 is opened and closed via a hinge (not shown) on the upper side of the box body 301. It is attached freely.

  The box body 301 is formed by forming the vacuum heat insulation panel 100 into a predetermined shape (substantially rectangular parallelepiped), attaching a resin 303 to both front and back surfaces of the vacuum heat insulation panel 100, and forming rubber on the outer periphery of the frame member 103 of the vacuum heat insulation panel 100. The packing 304 is attached.

  The lid 302 is formed by forming the vacuum heat insulation panel 100 into a predetermined shape (substantially rectangular parallelepiped), bonding the resin 305 to both front and back surfaces of the vacuum heat insulation panel 100, and forming rubber on the outer periphery of the frame member 103 of the vacuum heat insulation panel 100. The packing 306 is attached, and the handle 307 is attached to the upper surface.

  A lock device 308 is attached between the box body 301 and the lid body 302, and the lid body 302 can be locked to the box body 301 by the lock device 308.

  Therefore, this blood transport box 300 is capable of transporting a blood bag or the like at its temperature because the internal housing space 309 is surrounded by the vacuum heat insulation panel 100 and exhibits high heat insulation.

  Hereinafter, the principle of the vacuum heat insulation panel 100 according to the present embodiment will be described.

  When using the vacuum heat insulation panel 100 according to the present embodiment, the inside of the sealed space 120 is set to, for example, a high vacuum (may be a medium vacuum or a low vacuum). For this reason, since heat conduction by the air convection in the sealed space 120 (heat conduction between the side plates 101 and 102) can be extremely reduced, sufficiently high heat insulation can be obtained.

  On the other hand, when the inside of the sealed space 120 is evacuated to high vacuum, the side plates 101 and 102 tend to be deformed inward by the negative pressure of the sealed space 120. As a method for suppressing such deformation, a method using a high-strength side plate or a method using an inner plate can be considered. However, when a high-strength side plate is used to suppress this deformation, it is necessary to increase the thickness of the side plate, so that the total weight of the vacuum heat insulation panel 100 increases. Moreover, also when using a reinforcement means like patent document 1, since the weight of inner board 110 itself is large, the total weight of the vacuum heat insulation panel 100 will become large.

  On the other hand, in the present embodiment, a plurality of through holes 111 are provided in the inner plate 110, the projections 112 are inserted into the respective through holes 111, and both ends of these projections 112 are brought into contact with the side plates 101 and 102. It was decided to contact and support. Further, the side plates 101 and 102 are supported with the convex portions 107 in contact with the frame member 103. For this reason, even if the inner plate 110 is formed very thin, the side plates 101 and 102 can be sufficiently reinforced. Therefore, sufficient strength can be obtained while reducing the weight of the vacuum heat insulation panel 100.

  According to the examination result of the present inventor, even when the inside of the sealed space 120 is a high vacuum, a sufficient strength can be obtained only by using such a protrusion 112.

  Moreover, as described above, the two side plates 101 and 102 are made of a material having a lower thermal conductivity than that of glass, that is, a metal such as stainless steel. Therefore, the side plates 101 and 102 themselves have heat insulation properties. Can be increased. As a result, it is possible to further improve the heat insulating property of the entire vacuum heat insulating panel 100.

  Further, as described above, the three frame members 103, 104, and 105 are formed of a material having a lower thermal conductivity than glass, that is, a metal such as stainless steel. Therefore, the frame members 103, 104, and 105 are formed. The heat insulation of itself can also be improved. As a result, it is possible to further improve the heat insulating property of the entire vacuum heat insulating panel 100.

  Further, as described above, since the tip 112c and 112d of the protrusion 112 has a substantially conical shape, the contact area between the protrusion 112 and the side plates 101 and 102, that is, the heat flow area is reduced. As a result, heat conduction between the protruding portion 112 and the side plates 101 and 102 is suppressed, and heat is less likely to be transferred between the two side plates 101 and 102 via the protruding portion 112. Also in this point, the vacuum heat insulation panel 100 exhibits high heat insulation.

For example, according to the examination result of the present inventor, the vacuum heat insulation panel 100 is about 540 times larger than a general heat insulating material such as urethane foam (assuming that the thermal conductivity is 0.038 W / mK). Insulation was obtained. That is, the dimensions of the side plates 101 and 102 are 836 mm in width and 836 mm in length, 49 projections 112 are arranged at an equal pitch of 7 rows and 7 columns, and each projection 112 is a circle having a diameter of 1 mm and the side plates 101 and 102. Assume that they are touching. In this case, the area of the side plates 101 and 102 698896Mm ² becomes also, the contact area between the protrusions 112 and the side plates 101, 102 is 0.78 mm ^2. Therefore, if the thermal conductivity of the glass is 1.3 W / mK, the thermal conductivity of the vacuum heat insulation panel 100 is 0.000071 W / mK, which is approximately 1 / of the thermal conductivity 0.038 W / mK of a general heat insulating material. A result with a value of 540 was obtained.

  Further, as described above, each protrusion 112 is made of a material having a lower thermal conductivity than glass or ceramic, that is, a metal such as stainless steel, so that the heat insulation of the protrusion 112 itself is also improved. Can do. As a result, it is possible to further improve the heat insulating property of the entire vacuum heat insulating panel 100.

  Thus, the vacuum heat insulation panel 100 of this embodiment makes the inside of the sealed space 120 a vacuum state (high vacuum, medium vacuum, or low vacuum), and the two side plates 101 and 102 and the three frame members 103 and 104. 105 and each protrusion 112 are made of a material having low thermal conductivity. For this reason, even if the vacuum heat insulation panel 100 is made very thin, sufficiently high heat insulation can be obtained. That is, according to this embodiment, the vacuum heat insulation panel 100 with high heat insulation can be formed very thin. In the vacuum heat insulation panel 100 of this embodiment, the thickness was 11 mm, and the thermal conductivity between the side plates 101 and 102 was 0.00030 W / mK. On the other hand, the thermal conductivity of the heat insulation panel using urethane foam is about 0.02 W / mK.

  As described above, according to this embodiment, it is possible to provide a vacuum heat insulation panel that is light and thin and excellent in heat insulation.

Moreover, the vacuum heat insulating panel 100 is made of glass as the main components such as the two side plates 101 and 102 and the three frame members 103, 104, and 105, so that the oil content is smaller than when the main components are made of stainless steel. The heat treatment (baking) cost for removing can be reduced. That is, in order to remove oil, it is necessary to heat-treat at a high temperature of about 300 ° C. for stainless steel, whereas it is sufficient to heat-treat at a low temperature of about 100 ° C. for glass. Therefore, the heat treatment cost for removing the oil can be reduced.

  Further, as described above, the protrusion 112 is fixed to the inner plate 110 by the circlip 114 in the vacuum heat insulating panel 100. Therefore, even when the vacuum heat insulation panel 100 is used for an application that receives vibration, the protrusion 112 does not fall off the inner plate 110, and the function of suppressing deformation of the side plates 101 and 102 by the protrusion 112 is provided. It can be maintained over a long period of time.

Furthermore, since the vacuum heat insulation panel 100 uses the vacuum sealed space 120 as a heat insulation layer, it is more durable and recyclable than conventional heat insulation panels using heat insulating materials such as urethane foam and polystyrene foam. Is also excellent.
[Other Embodiments of the Invention]

  In the first embodiment described above, the vacuum heat insulating panel 100 in which both the two side plates 101 and 102 are made of glass has been described. However, depending on conditions such as the degree of thermal insulation required for the vacuum thermal insulation panel 100, it is possible to form only one of the two side plates 101 and 102 from glass.

  Moreover, in Embodiment 1 mentioned above, the vacuum heat insulation panel 100 in which the three frame materials 103, 104, and 105 were formed with glass was demonstrated. However, all or part of the frame members 103, 104, and 105 may be formed of a material other than glass (for example, a metal such as stainless steel).

  Moreover, in Embodiment 1 mentioned above, the vacuum heat insulation panel 100 which has the rectangular flat plate side plates 101 and 102 was demonstrated. However, the shape of the side plates 101 and 102 is not limited to a rectangular flat plate shape, and may be formed into, for example, a square flat plate shape or a circular flat plate shape.

  Further, in the above-described first embodiment, the case where the circlip 114 is used as the fixing means for fixing the protrusion 112 to the inner plate 110 has been described. However, fixing means other than the circlip 114 can be used instead or in combination as long as the protrusion 112 can be fixed to the inner plate 110.

  Moreover, in Embodiment 1 mentioned above, the case where the heat insulation box was the storage box 200 and the blood transport box 300 was demonstrated. However, the present invention is applied to heat insulating boxes other than the storage box 200 and the blood transport box 300 (for example, transport containers, storage containers, refrigerators, freezers, vending machines, building wall materials, heat shields for blast furnaces, etc.). It is also possible to apply the same.

  Further, the dimensions of the side plates 101 and 102, the inner plate 110, and the protrusion 112 are not limited to those described above.

  Furthermore, the number of protrusions 112 is not limited to that described above.

  The vacuum heat insulation panel of the present invention is used in various applications such as a container, a storage container, a refrigerator, a freezer, a vending machine, a building wall material, a heat shield for a blast furnace, in addition to a storage box and a blood transport box. Can be used for insulation.

100 …… Vacuum insulation panels 101, 102 …… Side plates 103 to 106 …… Frame material 110 …… Inner plate 111 …… Through hole 112 …… Protrusions 112a …… Small diameter cylindrical portion 112b …… Large diameter cylindrical portion 112c , 112d …… Tip portion 114 …… Circlip (fixing means)
119 …… Exhaust pipe 120 …… Enclosed space 200 …… Container box (insulation box)
300 …… Blood transport box (insulated box)

Claims (8)

A sealed space formed by using a pair of side plates opposed to each other by a predetermined distance and a frame member that closes a peripheral portion of the side plates, and disposed in the sealed space substantially parallel to the pair of side plates. In order to suppress deformation of the pair of side plates due to a pressure difference between the inside and outside of the sealed space by abutting on the inner plate and the inner side surface of at least one of the side plates, the inner plate is provided with the inner plate. A vacuum insulation panel having a plurality of protrusions,
At least one of the side plates is made of glass,
The frame member is formed in a U-shaped section, the projecting portion protruding both end portions of the U-shaped that will be connected to an end of the pair of side plates, the closed space side portion other than the both end portions has the door, the protrusion only the both end portions in contact with the side plates are spaced apart and each of the side plates, are each configured so that a gap is generated between the protruding portion and the side plates A vacuum insulation panel characterized by The vacuum heat insulating panel according to claim 1, wherein the pair of side plates have a convex portion supported by being in contact with the projecting portion of the frame member . The protrusion is disposed in a state of being inserted through a through hole provided in the inner plate, and both end portions are in contact with inner surfaces of the pair of side plates, respectively. Vacuum insulation panel as described in 1. The vacuum heat insulation panel according to any one of claims 1 to 3, wherein at least a part of the frame member is made of glass . 5. The vacuum heat insulating panel according to claim 3 , wherein each of the projecting portions has a substantially conical shape at each tip portion that abuts on the side plate . The vacuum heat insulation panel according to any one of claims 1 to 5 , wherein the protrusion is provided with a fixing means for fixing the protrusion to the inner plate . The vacuum insulation panel according to claim 1 , wherein the protrusion is made of glass or ceramic . A heat insulation box comprising the vacuum heat insulation panel according to any one of claims 1 to 7.

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