JP5031707B2 - Method for manufacturing heat insulating double structure and heat insulating double structure - Google Patents

Description

  The present invention relates to a method of manufacturing a heat insulating double structure having a cylindrical shape such as a vacuum double jacket and a vacuum double pipe disposed outside an inner container of an electric pot, and the heat insulating double structure. is there.

  In recent cold districts, when installing a water pipe between riverbanks, a vacuum double pipe is used so that internal water does not freeze under the influence of outside air (see Patent Document 1). Moreover, in the electric pot, in order to improve the heat retaining performance of the hot water in the inner container, a cylindrical vacuum double jacket is disposed outside the inner container (see Patent Document 2).

  These heat insulating double structures are provided with an inner member and an outer member having a cylindrical shape, and both end openings are joined in a sealed state, and a sealed space is formed between the joined portions. Since this heat insulation double structure has extremely good heat insulation performance inside and outside the inner member, it can be used in various fields.

  However, when the heat insulating double structure is a comparatively small one having a diameter of less than 30 cm, it is possible to secure rigidity by performing a bead processing extending in the circumferential direction on the surface of the inner member or the outer member. Although it is possible, it is extremely difficult to ensure rigidity when manufacturing a large product exceeding 30 cm.

  Here, as a configuration for ensuring rigidity, it is conceivable to increase the thickness of the inner member and the outer member. However, in this case, since the weight of the heat insulating double structure increases, it cannot be used depending on the purpose of use. Moreover, since the thermal conductivity increases, there is a problem that the heat insulation performance is lowered.

  As another configuration, it is conceivable to dispose a core material in a sealed space between the inner member and the outer member. However, since the inner member and the outer member each have a cylindrical shape, the core material cannot be disposed between them without any gap. Therefore, sufficient rigidity and appearance cannot be ensured.

Japanese Patent No. 2911094 Japanese Patent No. 4083156

  This invention is made | formed in view of the conventional problem, and makes it the 1st subject to provide the manufacturing method of the heat insulation double structure which can ensure sufficient rigidity. It is another object of the present invention to provide a heat insulating double structure that can easily correspond to a desired overall length.

In order to solve the above problems, the method for manufacturing a heat insulating double structure of the present invention is a stainless steel having a conical cylindrical shape in which a first opening located at one end has a larger opening area than a second opening located at the other end. comprising a steel plate of the inner and outer members, after disposing the plate-shaped core material having a compressibility on the outer surface of the inner member, and disposing the outer member to the outer surface of the core material, or the outer after arranging the plate-shaped core material having a compressibility to the inner surface of member, the inner member is disposed, fixed to both end opening portions of the inner member and the outer member sealingly together with the inner surface of the core material The core material is arranged in a compressed state in a sealed space between them.

  In this manufacturing method, since the inner member and the outer member have a conical cylindrical shape, the outer member is disposed on the outer surface of the core material while the core member is disposed on the outer surface of the inner member, or the outer member. By disposing the inner member on the inner surface of the core material in a state where the core material is disposed on the inner surface of the core material, the core material can be compressed and disposed without any gap therebetween. Therefore, sufficient rigidity and appearance can be ensured. As a result, a large heat insulating double structure having a cylindrical shape can be reliably manufactured.

And the heat insulation double structure manufactured by this method is the inner side made from the stainless steel plate in which the 1st inner side opening part located in one end makes a conical cylinder shape whose opening area is larger than the 2nd inner side opening part located in the other end member and, first outer opening without an opening area than the second outer opening is larger conical shape tubular located at the other end located at one end, the first inside the first outer opening said inner member while being fixed sealingly to the outer surface of the opening portion, the second outer opening is fixed sealingly to the outer surface of the second inner opening of the inner member, a predetermined across the opening of said inner member An outer member made of stainless steel plate that forms a sealed space with a width, and the outer member is disposed on the outer surface in a state of being disposed on the outer surface of the inner member, or disposed on the inner surface of the outer member. The inner member is disposed on the inner surface in a state of being By being a plate-shaped core material to be disposed in a compressed state in the closed space between the outer member and the inner member, it is made of.

  Since this heat insulating double structure has a cone shape, it is manufactured by adjusting the inclination angle of the outer peripheral surface, and connecting the small diameter opening of another heat insulating double structure into the large diameter opening. can do. As a result, the desired overall length can be obtained by connection even when the axial dimension is reduced during the production of the heat insulating double structure. And since sufficient rigidity is acquired with a core material, it is possible to make the thickness of an inner member and an outer member as thin as possible. As a result, the overall weight can be reduced. Moreover, since heat conductivity can be reduced, heat insulation performance can be improved.

  In this heat insulating double structure, a connecting portion having a step shape is provided in the first inner opening of the inner member, and a connected portion capable of connecting the connecting portion is provided in the second outer opening of the outer member. It is preferable. If it does in this way, two or more heat insulation double structures can be connected easily and reliably.

  In this case, it is preferable that the connecting portion and the connected portion are provided in a stepped manner from the opening ends of the first inner opening and the second outer opening to the formation region of the sealed space. If it does in this way, the core material of the 1st heat insulation double structure and the core material of the 2nd heat insulation double structure can be piled up inside and outside. Thereby, it can prevent that the part in which a core material does not exist over the full length in a connection state is formed. As a result, it can prevent that heat insulation performance falls.

  The sealed space is preferably evacuated from an exhaust hole provided in the inner member or the outer member, and the exhaust hole is sealed. In this way, the heat insulation performance inside the inner member and outside the outer member can be further improved.

  In the manufacturing method of the heat insulation double structure of this invention, a core material can be compressed and arrange | positioned without a clearance gap between the inner member and outer member which make cone shape. Therefore, sufficient rigidity and appearance can be ensured. As a result, a large heat insulating double structure having a large cylindrical opening area can be reliably manufactured.

  And the heat insulation double structure manufactured in this way adjusts the inclination angle of the outer peripheral surface, and inserts the small diameter opening of another heat insulation double structure into the large diameter opening. Can be connected. As a result, the desired overall length can be obtained by connection even when the axial dimension is reduced during the production of the heat insulating double structure. And the manufacture workability | operativity and precision can be improved by manufacturing the heat insulation double structure with a short full length at the time of manufacture.

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

  FIG. 1 shows a tubular heat insulating member 10 which is a heat insulating double structure according to the first embodiment of the present invention. The tubular heat insulating member 10 has a conical tubular shape in which the opening area of the first opening 11 located at the lower end is larger than the opening area of the second opening 12 located at the upper end. As shown in FIG. 2, the tubular heat insulating member 10 has a second opening portion of another second tubular heat insulating member 10 having the same shape from the first opening portion 11 of the first tubular heat insulating member 10 </ b> A. By inserting 12 in. The side wall portions 13 and 13 can be connected by being overlapped inside and outside.

  The tubular heat insulating member 10 includes an inner member 20 that constitutes an inner peripheral wall, an outer member 24 that constitutes an outer peripheral wall, and a core material 29 disposed therein.

  The inner member 20 is made of a stainless steel plate having a wall thickness of 0.2 to 1 mm, and the first inner opening 21 located at the lower end has a conical cylindrical shape having a larger opening area than the second inner opening 22 located at the upper end. belongs to. The inner member 20 of the present embodiment is provided with an enlarged diameter portion 23 that is bent outward at the lower end portion. The enlarged diameter portion 23 includes a bent portion 23a bent outward in the orthogonal direction and a joint portion 23b extending in parallel with other portions.

  The outer member 24 is made of a stainless steel plate having a thickness of 0.2 to 1 mm, and, like the inner member 20, the first outer opening 25 located at the lower end is opened from the second outer opening 26 located at the upper end. It has a conical cylindrical shape with a large area. In a state where the outer member 24 is viewed from the side, the inclination angle of the wall surface is formed to be the same as the inclination angle of the wall surface of the inner member 20. The outer member 24 of the present embodiment is provided with a reduced diameter portion 27 bent inward at the upper end portion. The reduced diameter portion 27 includes a bent portion 27a bent inward in the orthogonal direction and a joint portion 27b extending in parallel with other portions.

  Among them, the outer diameter of the first inner opening 21 of the inner member 20, that is, the outer diameter of the enlarged diameter portion 23, and the inner diameter of the first outer opening 25 of the outer member 24 are formed identically. Further, the outer diameter of the second inner opening 22 of the inner member 20 and the inner diameter of the second outer opening 26 of the outer member 24, that is, the inner diameter of the reduced diameter portion 27 are formed identically. The first inner opening 21 of the inner member 20 and the first outer opening 25 of the outer member 24 and the second inner opening 22 of the inner member 20 and the second outer opening 26 of the outer member 24 are: Each is fixed (joined) in a sealed state by seam welding. As a result, the intermediate portion of the inner member 20, the bent portion 23 a of the enlarged diameter portion 23, the intermediate portion of the outer member 24, and the bent portion 27 of the reduced diameter portion 27 are disposed between the opening portions 21, 25, 22, and 26. A sealed space 28 having a predetermined width surrounded by the portion 27a is formed.

  The core material 29 has compressibility such as glass wool or ceramic wool, and is disposed in a compressed state in a sealed space 28 between the inner member 20 and the outer member 24. The core material 29 of the present embodiment is configured by a fan-shaped plate body that is cut so as to be accommodated in a sealed space 28 having a conical cylinder shape. As shown in FIG. 4, the thickness T applied from one surface of the core material 29 to the other surface facing the core material 29 is thicker than the gap S of the sealed space 28, that is, the dimension S between the inner member 20 and the outer member 24. Is formed. Further, the outer diameter D1 of the smallest tip is formed smaller than the inner diameter D2 of the first outer opening 25 of the outer member 24.

  Further, the tubular heat insulating member 10 of the present embodiment has a getter (for maintaining a desired degree of vacuum by adsorbing the gas generated in the sealed space 28 so as to be located inside the sealed space 28. (Not shown) is provided. Further, an exhaust hole 31 is formed in a predetermined position near the lower end on the wall surface of the outer member 24. A tip tube 32 is disposed around the exhaust hole 31 and joined by welding. The tip tube 32 is sealed after the sealed space 28 is evacuated and evacuated, and a metal tip cover 33 is attached thereto.

  As shown in FIG. 2, the cylindrical heat insulating member 10 configured in this manner has another second cylindrical member B in the first opening 11 having a large opening area of the first cylindrical heat insulating member 10 </ b> A. Connection can be made by inserting from the side of the second opening 12 having a small opening area. These overlapping allowances can be set (changed) by adjusting the inclination angle of the side wall portion 13. That is, in order to obtain high heat insulation performance, the overlap margin is increased by increasing the inclination angle of each cylindrical heat insulating member 10A, 10B. On the other hand, in order to easily obtain a long full length, the overlap margin is reduced by reducing the inclination angle.

  Next, the manufacturing method of the cylindrical heat insulation member 10 of this embodiment is demonstrated.

  First, the inner member 20 is formed by winding a stainless steel plate punched out in a fan shape into a conical cylinder shape, and joining the edges abutted in the axial direction by TIG (Tungsten Inert Gas) welding. Subsequently, the end portion on the side of the first inner opening portion 21 having a large opening area is subjected to tube expansion processing, and the outer diameter portion 23 is slightly smaller than the inner diameter of the outer member 24 to form the enlarged diameter portion 23.

  Similarly, the outer member 24 is formed by winding a stainless steel plate punched into a fan shape having a larger curvature than the inner member 20 into a conical cylinder shape, and joining the edges that are butted along the axial direction by TIG welding. Next, the end of the second outer opening 26 having a small opening area is subjected to contraction processing to provide a reduced diameter portion 27 whose outer diameter is slightly larger than the outer diameter of the inner member 20. Further, the exhaust hole 31 is formed by punching a part of the outer peripheral portion, and the tip tube 32 is joined around the exhaust hole 31.

  Next, as shown in FIGS. 3 and 4, the core material 29 punched out in a fan shape is wound around the outer surface of the inner member 20, and then the outer member 24 is covered on the outer surface of the core material 29. At this time, a getter is disposed between the core material 29 and the inner member 20 or between the core material 29 and the outer member 24 by positioning the getter on the compressible core material 29. The core material 29 may be positioned with a wire or the like while the core material 29 is wound around the inner member 20.

  Thereafter, the outer member 24 is pressed toward the inner member 20 so that the inner openings 21 and 22 of the inner member 20 and the outer openings 25 and 26 of the outer member 24 are aligned. Accordingly, the core material 29 having a thickness T larger than the dimension S of the sealed space 28 is accommodated in the sealed space 28 in a state where the core material 29 is compressed between the inner member 20 and the outer member 24 with a predetermined pressure. At this time, in the present embodiment, the first inner opening 21 located at the lower end of the inner member 20 is provided with an enlarged diameter portion 23 that protrudes outward, and therefore on the bent portion 23a of the enlarged diameter portion 23. The core material 29 is locked. Therefore, the core material 29 does not fall off from the mounting position when the outer member 24 is pressed.

  In this way, when the inner openings 21 and 22 of the inner member 20 and the outer openings 25 and 26 of the outer member 24 are aligned, they are joined together in a sealed state by seam welding. Then, an exhaust device is connected to the tip tube 32 projecting outward, and the space closed by the inner member 20 and the outer member 24 is evacuated to a predetermined pressure and heated to a temperature at which the getter is activated. Thereafter, the tip tube is sealed and the tip cover 33 is attached. At the time of vacuum evacuation, the core material 29 exists around the exhaust hole 31, but the core material 29 of the present embodiment is made of glass wool or ceramic wool, so that there is no gap between the fibers without hindering the exhaust efficiency. Thus, exhaust can be efficiently performed.

  Thus, since the cylindrical heat insulating member 10 manufactured by the manufacturing method of the present invention has the inner member 20 and the outer member 24 in a conical cylindrical shape, the core material 29 is disposed on the outer surface of the inner member 20. By disposing the outer member 24 on the outer surface of the core material 29, the core material 29 can be compressed and disposed without any gap therebetween. Therefore, even when manufacturing a large cylindrical heat insulating member 10 having a diameter exceeding 30 cm, the overall rigidity and appearance can be sufficiently ensured without increasing the thickness of the inner member 20 and the outer member 24.

  Further, since this cylindrical heat insulating member 10 has a conical cylindrical shape, it is connected by inserting the side of the second opening portion 12 having a small diameter into the first opening portion 11 having a large diameter as described above, and a desired total length. Can be obtained. That is, when manufacturing the cylindrical heat insulating member 10, the total length of the cylindrical heat insulating member 10 is not necessarily long. And at the time of manufacture, by making the axial dimension small, manufacturing workability can be greatly improved and the possibility of manufacturing loss can be reduced. As a result, productivity can be greatly improved.

  Furthermore, since the cylindrical heat insulating member 10 of this embodiment can obtain sufficient rigidity by the core material 29, the inner member 20 and the outer member 24 can be made as thin as possible. As a result, it is possible to reduce the weight of the entire tubular heat insulating member 10. Moreover, since heat conductivity can be reduced, heat insulation performance can be improved. In addition, in the present embodiment, the heat insulation performance inside the inner member 20 and outside the outer member 24 can be further improved because the inside of the sealed space 28 is a vacuum double structure.

  And this cylindrical heat insulation member 10 can be used as a water pipe like patent document 1, or can be used as a heat insulation member of the inner container of an electric pot like patent document 2. FIG. Moreover, since the diameter is large and the overall length can be adjusted as desired by connection, it can be used as a heat insulating wall of a small furnace, and the usable range can be greatly expanded.

  FIG. 5 shows the cylindrical heat insulating members 10A and 10B of the second embodiment. In the second embodiment, the enlarged diameter portion 23 formed in the first inner opening portion 21 and the reduced diameter portion 27 formed in the second outer opening portion 26 are used as a connecting portion and a connected portion that can be connected to each other. This is different from the first embodiment in that it is possible.

  That is, in the second embodiment, similarly to the first embodiment, the inner member 20 is provided with the enlarged diameter portion 23 in the first inner opening 21 at the lower end. Further, the outer member 24 is provided with a reduced diameter portion 27 in the second outer opening 26 at the upper end. Then, the inner diameter of the enlarged diameter portion 23 of the inner member 20, specifically, the inner diameter dimension d1 between the bent positions of the bent portion 23a and the joint portion 23b, the outer diameter of the reduced diameter portion 27 of the outer member 24, specifically Is formed so as to be substantially the same as the outer diameter d2 between the outer edges of the bent portion 27a. That is, the inclination angle of the side wall portion 13 of the tubular heat insulating member 10 is set so that the inner diameter d1 of the enlarged diameter portion 23 of the inner member 20 and the outer diameter d2 of the reduced diameter portion 27 of the outer member 24 are substantially the same. ing.

  In the second embodiment, similarly to the first embodiment, when the second cylindrical heat insulating member 10B is connected to the first cylindrical heat insulating member 10A, the first cylindrical heat insulating member 10A is the first one. The second cylindrical heat insulating member 10 </ b> B is inserted into the opening 11 from the second opening 12 side. Thereby, the reduced diameter part 27 which is a to-be-connected part of the 2nd cylindrical heat insulation member 10B fits into the diameter expansion part 23 which is a connection part of 10 A of 1st cylindrical heat insulation members. Since the diameter-expanded portion 23 and the diameter-reduced portion 27 each have a step shape, the joint portion 23b of the diameter-expanded portion 23 of the first tubular heat insulating member 10A is the side wall portion 13 of the second tubular heat-insulating member 10B. The joint portion 27b of the reduced diameter portion 27 of the second cylindrical heat insulating member 10B extends along the inner surface of the side wall portion 13 of the first cylindrical heat insulating member 10A.

  Therefore, in this 2nd Embodiment, the effect | action and effect similar to 1st Embodiment can be acquired, and the several cylindrical heat insulation member 10 can be connected easily and reliably.

  FIG. 6 shows cylindrical heat insulating members 10A and 10B of the third embodiment. In the third embodiment, as in the second embodiment, the enlarged diameter portion 23 and the reduced diameter portion 27 can be used as the connecting portion and the connected portion. It differs from 2nd Embodiment by the point which enabled it to improve heat insulation performance by forming in the step shape of a step.

  That is, in the third embodiment, as in the second embodiment, the side wall portion 13 is formed at an inclination angle at which the enlarged diameter portion 23 and the reduced diameter portion 27 can be engaged. The enlarged diameter portion 23 is provided in a step shape from the opening end of the first inner opening portion 21 to the formation region of the sealed space 28. Specifically, the enlarged diameter portion 23 includes a first bent portion 23a-1 bent outward in the orthogonal direction and a second bent portion 23a- bent downward in the orthogonal direction with respect to the first bent portion 23a-1. 2, a third bent portion 23a-3 bent outward in the orthogonal direction with respect to the second bent portion 23a-2, and a joint portion 23b bent downward in the orthogonal direction with respect to the third bent portion 23a-3 It consists of. Similarly, the reduced diameter portion 27 is provided in a step shape from the opening end of the second outer opening portion 26 to the formation region of the sealed space 28. Specifically, the reduced diameter portion 27 includes a first bent portion 27a-1 bent inward in the orthogonal direction and a second bent portion 27a- bent upward in the orthogonal direction with respect to the first bent portion 27a-1. 2, a third bent portion 27a-3 bent inward in the orthogonal direction with respect to the second bent portion 27a-2, and a joint portion 27b bent upward in the orthogonal direction with respect to the third bent portion 27a-3 It consists of.

When connecting the cylindrical heat insulating members 10A and 10B of the third embodiment, they can be connected easily and reliably as in the second embodiment. In addition, in the connected state of the third embodiment, the diameter-enlarged portion 23 that is the connecting portion and the diameter-reduced portion 27 that is the connected portion have a stepped shape extending toward the sealed space 28, so the first tubular heat insulating member 10 </ b> A The core material 29 and the core material 29 of the second cylindrical heat insulating member 10B can form a region where the core material 29 overlaps inside and outside (in the radial direction). Therefore, in the connected state, there is no portion where the core material 29 does not exist over the entire length. As a result, it can prevent that heat insulation performance falls.

  In addition, the vacuum double structure of this invention and its manufacturing method are not limited to the structure of the said embodiment, A various change is possible.

  For example, in the above-described embodiment, the core material 29 is disposed on the outer surface of the inner member 20 and the outer member 24 is disposed on the outer surface. However, the core material 29 is disposed on the inner surface of the outer member 24. The inner member 20 may be disposed on the inner surface.

  Moreover, in the said embodiment, although the connection part was comprised by the enlarged diameter part 23 and the to-be-connected part was comprised by the reduced diameter part 27, a dedicated connection part and a to-be-connected part may be formed, and the shape is Changes can be made as desired.

  Furthermore, in the said embodiment, although it comprised so that the core material 29 might be arrange | positioned over the whole sealed space 28, it is good also as a structure arrange | positioned in multiple places with the predetermined space | interval in the circumferential direction.

  In the embodiment, the cylindrical heat insulating member 10 is formed in a conical cylindrical shape, but is not limited to a circular shape in plan view, and may be a conical cylindrical shape having a non-circular shape such as an ellipse or a polygon.

  Of course, in the above embodiment, the heat insulation performance is improved by evacuating the sealed space 28 as a heat insulating double structure, but the inside of the sealed space 28 may not be evacuated. .

It is a perspective view which shows the cylindrical heat insulation member of 1st Embodiment of this invention. It is sectional drawing which shows the connection state of the cylindrical heat insulation member of FIG. It is a perspective view which shows the manufacturing method of a cylindrical heat insulation member. It is sectional drawing which shows the state of FIG. It is sectional drawing which shows the connection state of the cylindrical heat insulation member of 2nd Embodiment. It is sectional drawing which shows the connection state of the cylindrical heat insulation member of 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,10A, 10B ... Cylindrical heat insulation member 20 ... Inner member 21 ... 1st inner side opening part 22 ... Second inner side opening part 23 ... Diameter expansion part (connection part)
24 ... Outer member 25 ... First outer opening 26 ... Second outer opening 27 ... Reduced diameter portion (connected portion)
28 ... Sealed space 29 ... Core material

Claims (5)

The first opening located at one end includes an inner member and an outer member made of a stainless steel plate having a conical cylindrical shape having a larger opening area than the second opening located at the other end,
After arranging the plate-shaped core material having a compressibility on the outer surface of the inner member, the outer member is disposed on the outer surface of the core material, or a plate-shaped having a compressibility to the inner surface of the outer member after disposing the core material, said inner member disposed on an inner surface of the core material,
The manufacturing method of the heat insulation double structure characterized by adhering the both-ends opening part of the said inner member and the said outer member in the sealed state mutually, and arrange | positioning the said core material in the sealed space between these in a compressed state. An inner member made of a stainless steel plate in which a first inner opening located at one end has a conical cylindrical shape with a larger opening area than a second inner opening located at the other end;
None of the first outer opening opening area than the second outer opening is larger conical shape tubular located at the other end located at one end, said first outer opening of the first inner opening of the inner member while being fixed sealingly to the outer surface, the sealing of the second outer opening is fixed sealingly to the outer surface of the second inner opening of the inner member, a predetermined width across the opening of said inner member An outer member made of stainless steel plate forming a space;
The outer member is disposed on the outer surface in a state disposed on the outer surface of the inner member, or the inner member is disposed on the inner surface in a state disposed on the inner surface of the outer member. Accordingly, a plate-shaped core material to be disposed in a compressed state in the closed space between the inner member and the outer member,
A heat insulating double structure characterized by comprising:   The connection part which makes a step shape in the 1st inner side opening part of the inside member is provided, and the to-be-connected part which can connect the connection part to the 2nd outside opening part of the outside member is provided. 2. The heat insulating double structure according to 2.   4. The heat insulation according to claim 3, wherein the connection part and the connected part are provided in a stepped manner from the opening ends of the first inner opening part and the second outer opening part to the formation region of the sealed space. Double structure.   5. The inside of the sealed space is evacuated from an exhaust hole provided in the inner member or the outer member, and the exhaust hole is sealed. 5. A heat insulating double structure as described in 1.

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