JP2007327549A - Vacuum structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent the bias and degradation in heat insulating performance. <P>SOLUTION: In a vacuum space 18, there are arranged a spherical spacer 19 having a diameter D1 which has contact with the opposed faces of a first metal member 10 and a second metal member 14 and a positioning member 20 which positions the spherical spacer 19 on the first metal member 10. The positioning member 20 has an opening portion 23 located on the side of the second metal member 14 for the spherical spacer 19 to be protruded therefrom. A diameter d1 of the opening portion 23 is smaller than the diameter D1 of the spherical spacer 19 and larger than a cross section diameter D2 of a portion of the spherical spacer 19 identical to the opening portion 23. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a vacuum structure such as a vacuum heat insulating panel, a thermos bottle, a vacuum double tube, a vacuum double jacket, a vacuum vessel, and the like, and the vacuum structure.

  Prior art document information relating to the vacuum structure of the present invention includes the following.

Japanese Patent No. 3045543

  This patent document describes a heat insulating panel that is a vacuum structure that is thin and has high heat insulating performance. This heat insulating panel is configured to form a vacuum space at a predetermined interval between a pair of panels made of metal and hold the vacuum space with a plurality of spherical spacers. Further, in this patent document, a metal foil provided with a star-shaped through hole is provided, and a configuration in which a spherical spacer is positioned in the through hole, or a protrusion that curves outward from the vacuum space side is provided. A configuration for positioning a spherical spacer in the groove is described.

  In addition, the vacuum structure for heat insulation needs to have a uniform gap across the entire area between the pair of metal panels in order to prevent unevenness of the heat insulation performance, and the metal panel needs to be as thin as possible. There is.

  However, in the case of the first example of the patent document, since the arrangement position of the spherical spacer cannot be regulated, the area where the spherical spacer is not located is extremely deformed and the thickness becomes nonuniform after evacuation. As a result, there is a problem that the heat insulation performance is also biased.

  This problem can be solved by arranging a spherical spacer in a positioning member or groove having a through hole, as described in other examples. However, in the case of positioning by the through hole, the spherical spacer is in contact with the edge of the through hole linearly or at a plurality of points. Heat is transferred to one metal panel. Moreover, when positioning by the groove | channel inside the convex curve curved outward, since the contact area of a spherical spacer and each metal panel increases, the area which can be heat-transferred increases. Incidentally, when the vacuum space is evacuated, the thin metal panel is deformed, so that the contact area is further increased. As a result, in any case, there is a problem that the heat insulation performance is lowered.

  This invention is made | formed in view of the conventional problem, and makes it a subject to provide the vacuum structure which can prevent the bias | inclination and fall of heat insulation performance reliably.

  In order to solve the above problems, a vacuum structure of the present invention includes a first metal member and a second metal member positioned at a predetermined interval from the first metal member, and a vacuum in which a vacuum space is formed therebetween. In the structure, a spherical spacer having a diameter (D1) that contacts a facing surface of the first metal member and the second metal member is disposed in the vacuum space, and the spherical spacer is positioned on the first metal member. A positioning member is provided, and the positioning member includes an opening that is located on the second metal member side and projects the spherical spacer, and the diameter (d1) of the opening is equal to that of the spherical spacer. The configuration is smaller than the diameter (D1) and larger than the cross-sectional diameter (D2) of the portion of the spherical spacer that coincides with the opening.

  In the vacuum structure of the present invention, since the spherical spacers are positioned by the positioning member, the spherical spacers can be uniformly disposed in the vacuum space with a preset distribution. As a result, it is possible to prevent the thickness of the metal structure from becoming non-uniform and to prevent a decrease in heat insulation performance associated therewith.

  Further, since the positioning member has an opening having a diameter (d1) smaller than the diameter (D1) of the spherical spacer and larger than the cross-sectional diameter (D2) of the corresponding portion, the spherical spacer is not in contact with the opening. You will touch only at one point. Therefore, heat transfer through the spherical spacer and the positioning member can be suppressed, and a decrease in heat insulation performance can be suppressed.

  In this vacuum structure, it is preferable that at least one of the first and second metal members is provided with a reinforcing portion at a contact portion of the spherical spacer. By doing so, it is possible to prevent an increase in the contact area with the spherical spacer due to deformation of the metal member, and thus it is possible to further prevent a decrease in heat insulation performance.

  Specifically, it is preferable that the reinforcing portion is made of a reinforcing plate. In this way, productivity of the metal member can be improved.

  Or it is preferable that the said reinforcement part consists of a recessed part depressed toward the said vacuum space. In this way, the number of parts can be reduced.

  In this case, the bottom surface of the recess is preferably a flat surface or a curved surface with the opening side of the recess as a center point. In this way, point contact with the spherical spacer can be reliably maintained, and an increase in contact area due to deformation can be reliably prevented.

  Moreover, it is preferable that the edge of the said reinforcement part is used as the positioning part of the said positioning member. In this way, workability at the time of manufacture can be improved.

  In the vacuum structure of the present invention, since the spherical spacer is positioned by the positioning member, the spherical spacer can be uniformly disposed inside the vacuum space, and the problem of non-uniform thickness and the problem of deterioration of heat insulation performance can be prevented. Further, the positioning member has an opening whose diameter (d1) is smaller than the diameter (D1) of the spherical spacer and larger than the cross-sectional diameter (D2) of the corresponding part, and therefore, heat transfer through the spherical spacer and the positioning member is suppressed. It is possible to suppress a decrease in heat insulation performance.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1A, 1B and 2 show a vacuum heat insulation panel which is a vacuum structure according to the first embodiment of the present invention. The vacuum heat insulation panel includes a pair of metal members 10 and 14, a plurality of spherical spacers 19 disposed in a vacuum space 18 inside the metal panels 10 and 14, and a position for positioning the spherical spacers 19. A positioning member 20. Further, getters (not shown) for absorbing gas generated in the vacuum space 18 after evacuation and maintaining a desired degree of vacuum are disposed at predetermined positions of the metal panels 10 and 14. .

  Specifically, the first metal panel 10 and the second metal panel 14 constituting the exterior body of the vacuum heat insulation panel are each made of thin stainless steel (SUS304). The first metal panel 10 includes a first base surface portion 11 in contact with the spherical spacer 19, a first outer surface portion 12 bent from the outer peripheral edge of the first base surface portion 11, and an edge of the first outer surface portion 12. And a first joint edge 13 bent outward so as to form a flange shape. The second metal panel 14 has the same shape and is arranged symmetrically with respect to the first metal panel 10, and includes a second base surface portion 15, a second outer surface portion 16, and a second joint edge portion 17. It has. These metal panels 10 and 14 are abutted so that the joining edge portions 13 and 17 overlap each other, and are joined by pressure bonding such as seam welding, butt welding such as TIG welding, MIG brazing, or the like. Thereby, the base surface parts 11 and 15 of each metal panel 10 and 14 are located with a predetermined space | interval mutually, and the space comprises the vacuum space 18 after evacuation. The metal panels 10 and 14 are not limited to stainless steel but may be iron or titanium, and can be changed according to the required heat-resistant temperature. Moreover, different metal materials may be used for the first metal panel 10 and the second metal panel 14.

The spherical spacer 19 is made of zirconia (Zro ₂ ), which is a kind of hard ceramic having low thermal conductivity, in a spherical shape. The diameter D1 of the spherical spacer 19 is the same as the gap between the opposing surfaces of the base surface portions 11 and 15 in a state where the metal panels 10 and 14 are joined. The spherical spacer 19 is not limited to a ceramic ball, and may be a glass ball or a heat-resistant resin ball, or any hard material having a low thermal conductivity.

  The positioning member 20 is for individually positioning and holding the spherical spacers 19 with respect to the first base surface portion 11 of the first metal panel 10, and is made of stainless steel (SUS304) similar to the metal panels 10 and 14. ing. Specifically, the positioning member 20 includes an annular base portion 21 and a conical cylinder portion 22 that protrudes upward from the inner peripheral edge of the base portion 21. The total height of the positioning member 20 is formed to be higher than the gap between the opposing surfaces of the base surface portions 11 and 15, that is, the dimension half the diameter D 1 of the spherical spacer 19. Further, the upper end opening of the conical cylinder portion 22 constitutes an opening portion 23 through which the spherical spacer 19 protrudes. The diameter d 1 of the opening 23 is smaller than the diameter D 1 of the spherical spacer 19, and the inner diameter d 2 of the base 21 is formed larger than the diameter D 1 of the spherical spacer 19. In addition, the diameter d1 of the opening 23 is the same as the cross-sectional diameter D2 of the portion of the spherical spacer 19 that coincides with the height of the opening 23, that is, the height from the mounting surface in the state where the spherical spacer 19 is mounted. It is formed to be larger than the diameter D2 of a cross section (see the alternate long and short dash line in FIG. 1B) cut in the horizontal direction at the same position as the height of the opening 23. The positioning member 20 is not limited to stainless steel (metal), and may be formed of a heat resistant resin.

  In the present embodiment, the metal panels 10 and 14 are both 0.5 mm thin. On the other hand, the positioning member 20 is a thinner one with a thickness of 0.2 mm.

  Next, the manufacturing method of the said vacuum heat insulation panel is demonstrated.

  First, as shown in FIG. 2, an exhaust part 24 that protrudes in a convex cross section is formed in the second metal panel 14 before joining, and an exhaust hole 25 is formed in the exhaust part 24. In addition, this exhaust hole 25 may just form an opening in the 2nd metal panel 14, and may join a chip pipe | tube. The first metal panel 10 is provided with a projecting piece 26 that closes the lower surface of the exhaust part 24.

  First, a plurality of spherical spacers 19 are arranged on the inner surface of the first base surface portion 11 of the first metal panel 10 with a uniform distribution, and then the positioning member 20 is placed thereon. Then, the base portion 21 of each positioning member 20 is joined to the first base surface portion 11 by spot welding or the like. In this state, due to the relationship between the spherical spacer 19 and the opening 23 of the positioning member 20 (D1> d1> D2), the spherical spacer 19 does not fall off the positioning member 20 and is reliably maintained.

  Next, in the state where the getter is disposed on the first metal panel 10 or the second metal panel 14, the joining edges 13 and 17 are overlapped and joined. Thereafter, the exhaust pipe of the exhaust device is pressed to the exhaust hole 25 of the second metal panel 14 through the seal member, and vacuum exhaust is performed so that a predetermined degree of vacuum is achieved.

  When the specified vacuum level is reached by evacuation, a leak test device is used to test whether there is a leak in the internal space of the exterior body while maintaining the vacuum level. While joining the base part (base part) of the said exhaust part 24 by seam welding, it cut | disconnects in the position which becomes flush with another outer periphery.

  The getter is activated by being heated in a predetermined high temperature atmosphere in the exhaust process. Alternatively, the evacuation step is performed under an atmosphere at a temperature that is not activated or at a normal temperature, and after sealing the exhaust holes, a plurality of vacuum heat insulation panels are collectively placed in a heating furnace and heated at a high temperature. Activated by.

  In the vacuum heat insulation panel manufactured in this way, a vacuum space 18 having the same width as the diameter D1 of the spherical spacer is formed between the first base surface portion 11 and the second base surface portion 15. The spherical spacers 19 are in contact with the opposing surfaces (inner side surfaces) between the first base surface portion 11 and the second base surface portion 15, and the distance therebetween is maintained. The spherical spacer 19 is positioned so as not to move by a positioning member 20 joined to the first metal panel 10.

  Thus, since the vacuum heat insulation panel of this embodiment positions the spherical spacer 19 with the positioning member 20, the spherical spacer 19 can be uniformly arrange | positioned by the preset distribution inside the vacuum space 18. FIG. As a result, it is possible to prevent the thickness of the metal structure from becoming non-uniform and to prevent a decrease in heat insulation performance associated therewith.

  Further, the positioning member 20 has an opening 23 whose diameter d1 is smaller than the diameter D1 of the spherical spacer 19 and larger than the cross-sectional diameter D2 of the corresponding part. Therefore, the spherical spacer 19 comes into contact with the opening 23 in a non-contact manner or only at one point. As a result, heat transfer through the spherical spacer 19 and the positioning member 20 can be suppressed, and a decrease in heat insulation performance can be suppressed.

  FIG. 3A shows the vacuum heat insulation panel of the second embodiment. This second embodiment is greatly different from the first embodiment in that a reinforcing portion is provided by joining a reinforcing plate 27 to a portion where the spherical spacer 19 contacts in the base surface portions 11 and 15 of the metal panels 10 and 14. It is different.

  The reinforcing plate 27 is made of stainless steel (SUS304) similar to the metal panels 10 and 14. In the present embodiment, the reinforcing plate 27 is configured by a disc slightly smaller than the diameter d2 of the base portion 21 of the positioning member 20, and the outer peripheral edge of the reinforcing plate 27 is configured as a positioning portion of the positioning member 20. In this embodiment, a reinforcing plate 27 having a thickness of 0.5 to 1.0 mm is joined to the metal panels 10 and 14 and the positioning member 20 having the same dimensions as those of the first embodiment by spot welding or the like. Yes. The diameter D1 of the spherical spacer 19 is the same as the dimension between the reinforcing plates 27 and 27, which are opposed surfaces of the first metal panel 10 and the second metal panel 14.

  In the second embodiment, even if the base surface portions 11 and 15 of the thin metal panels 10 and 14 are deformed by evacuation, the reinforcing portion by the reinforcing plate 27 can be prevented from being deformed. As a result, it is possible to prevent the contact area with the spherical spacer 19 from being increased due to the deformation of the thin metal panels 10 and 14, and further to prevent the heat insulation performance from being lowered.

  Moreover, since the reinforcement part which consists of metal plates can be easily joined by spot welding, productivity can be improved. In addition, in the present embodiment, the reinforcing plate 27 joined to the first metal panel 10 is configured so as to be used as a positioning portion when the positioning member 20 is disposed, so that productivity can be improved. .

  FIG. 3B shows a vacuum heat insulation panel of the third embodiment. This third embodiment is different from the second embodiment only in that a reinforcing portion is provided integrally with the metal panels 10 and 14 instead of the reinforcing plate 27 of the second embodiment.

  Specifically, the metal panels 10 and 14 are each provided with a concave portion 28 that is recessed toward the vacuum space 18, and the concave portion 28 constitutes a reinforcing portion similar to the reinforcing plate 27. The concave portion 28 is formed of a circular recess having a diameter slightly smaller than the diameter d2 of the base portion 21 of the positioning member 20, and an edge protruding inward thereof can be used as a positioning portion of the positioning member 20.

  In the third embodiment, the bottom of the concave portion 28 having a narrow flat surface is less deformed than the base surface portions 11 and 15 which are wide flat surfaces. Moreover, the pressure resistance of the bent portion is improved. Therefore, similarly to the second embodiment, an increase in the contact area with the spherical spacer 19 due to the deformation of the thin metal panels 10 and 14 can be prevented. Further, since another member such as the reinforcing plate 27 is unnecessary, the number of parts can be reduced. And since it can be used as a positioning part of the positioning member 20, productivity can be improved.

  FIG. 3C shows a vacuum heat insulation panel of the fourth embodiment. This fourth embodiment is different from the third embodiment only in that the bottom surface 29 of the recess 28 is formed by a curved surface that curves inward.

  Specifically, the bottom surface 29 of the concave portion 28 that is the reinforcing portion of the fourth embodiment is configured by a curved surface that is curved with a predetermined radius R around the opening 28 a side of the concave portion 28. In 4th Embodiment comprised in this way, since the point contact with the spherical spacer 19 can be maintained reliably, the fall of heat insulation performance can be prevented reliably. In addition, this structure cannot be implemented without using the positioning member 20.

  FIG. 4 shows a vacuum heat insulation panel of the fifth embodiment. The fifth embodiment is different from the first embodiment only in that the conical cylinder portion 22 of the positioning member 20 is constituted by three inclined pieces 30. Specifically, the positioning member 20 protrudes at equal intervals from the inner peripheral edge of the annular base portion 21, and a virtual circle formed by a locus connecting these tips viewed from above vertically has an opening similar to that of the first embodiment. Part 23 is configured. And the diameter d1 of this opening part 23 is comprised so that it may become the same relationship (D1> d1> D2) with respect to the diameters D1 and D2 of the spherical spacer 19, similarly to 1st Embodiment.

  In the fifth embodiment configured as described above, the same operations and effects as those of the first embodiment can be obtained, and the weight of the entire vacuum heat insulation panel can be reduced with the weight reduction of the positioning member 20. . Note that four or more inclined sides 30 may be provided.

  FIG. 5 shows a vacuum heat insulation panel of the sixth embodiment. The sixth embodiment is different from the first embodiment in that the spherical spacers 19 arranged in the vacuum space 18 are all positioned and held by one positioning member 31.

  Specifically, the positioning member 31 of the sixth embodiment includes a base portion 32 formed of a substantially rectangular ring slightly smaller than the base surface portions 11 and 15, and an outer peripheral portion 33 is provided by bending from the inner peripheral edge of the base portion 32. An upper surface portion 34 is provided so as to cover the outer peripheral portion 33. In addition, the total height from the base part 32 to the upper surface part 34 is the same as the positioning member 20 of 1st Embodiment.

  The upper surface portion 34 is provided with an opening 35 at a portion where the spherical spacer 19 is disposed. The opening 35 has a circular shape, and the diameter d1 is smaller than the diameter D1 of the spherical spacer 19 and, in the spherical spacer 19, the portion of the portion that coincides with the height of the opening 35 is the same as in the first embodiment. It is formed larger than the cross-sectional diameter D2.

  In the sixth embodiment, the number of spherical spacers 19 arranged in the vacuum space 18 are arranged, and one positioning member 31 is arranged. Then, the spherical spacer 19 is positioned in each opening 35, and the base portion 32 is brought into contact with and joined to the first base surface portion 11 of the first metal panel 10. The following manufacturing process is the same as that of the first embodiment.

  And in the vacuum heat insulation panel manufactured in this way, the same operation and effect as a 1st embodiment can be acquired, and in order to position spherical spacer 19, a plurality of positioning members 20 are not joined. Since only one positioning member 31 has to be joined, the number of parts can be reduced and the productivity can be improved.

  In addition, the vacuum structure of this invention is not limited to the structure of the said embodiment, A various change is possible.

  For example, the configuration using the positioning member 20 provided with the inclined piece 30 as in the fifth embodiment, or the positioning member 31 that positions the plurality of spherical spacers 19 as in the sixth embodiment, and the second embodiment to the second embodiment. It is also possible to combine with the structure which provides a reinforcement part (reinforcement board 27, the recessed part 28) like 4 embodiment.

  Moreover, in the said embodiment, although the shape of the vacuum heat insulation panel was formed in the planar view rectangular shape, it may be triangular shape, polygonal shape more than a pentagon, and may be circular shape, and can be changed as desired.

  Furthermore, in the said embodiment, although the heat insulation panel was applied as a vacuum structure, it is applicable also to vacuum structures, such as a thermos, a vacuum double tube, a vacuum double jacket, a vacuum vessel, and the same effect | action and effect are obtained. Obtainable.

(A) is sectional drawing which shows the vacuum heat insulation panel which is the vacuum structure of 1st Embodiment which concerns on this invention, (B) is a principal part enlarged view of (A). It is a disassembled perspective view which shows the state before joining. (A) is sectional drawing which shows 2nd Embodiment, (B) is sectional drawing which shows 3rd Embodiment, (C) is sectional drawing which shows 4th Embodiment. It is a disassembled perspective view which shows 5th Embodiment. It is a disassembled perspective view which shows 6th Embodiment.

Explanation of symbols

10 ... 1st metal panel (1st metal member)
14 ... 2nd metal panel (2nd metal member)
DESCRIPTION OF SYMBOLS 18 ... Vacuum space 19 ... Spherical spacer 20, 31 ... Positioning member 23, 35 ... Opening 27 ... Reinforcement board (reinforcement part)
28: Recessed part (reinforcing part)

Claims (6)

In a vacuum structure including a first metal member and a second metal member positioned at a predetermined interval from the first metal member, and forming a vacuum space therebetween,
A positioning member for positioning the spherical spacer on the first metal member while disposing a spherical spacer having a diameter (D1) in contact with the opposing surfaces of the first metal member and the second metal member in the vacuum space. Arrange
The positioning member includes an opening that is located on the second metal member side and projects the spherical spacer;
The vacuum structure according to claim 1, wherein a diameter (d1) of the opening is smaller than a diameter (D1) of the spherical spacer and is larger than a cross-sectional diameter (D2) of a portion of the spherical spacer coincident with the opening.   The vacuum structure according to claim 1, wherein a reinforcing portion is provided at a contact portion of the spherical spacer in at least one of the first and second metal members.   The vacuum structure according to claim 2, wherein the reinforcing portion is made of a reinforcing plate.   The vacuum structure according to claim 2, wherein the reinforcing portion is a concave portion that is recessed toward the vacuum space.   The vacuum structure according to claim 4, wherein the bottom surface of the concave portion is a flat surface or a curved surface with the opening side of the concave portion as a center point.   The vacuum structure according to any one of claims 2 to 5, wherein an edge of the reinforcing portion is used as a positioning portion of the positioning member.

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