JP4689590B2 - Vacuum double structure manufacturing method, exhaust device, and vacuum double structure - Google Patents

Description

  The present invention relates to a vacuum double bottle used for a thermos bottle, a vacuum double container used for an electric pot, a vacuum double jacket provided outside the inner container of the electric pot, a vacuum double pipe, a heat insulation panel, etc. The present invention relates to a manufacturing method of a double structure, an exhaust device thereof, and a vacuum double structure manufactured by these.

  A conventional metal vacuum double structure is formed by joining an inner member and an outer member made of a stainless steel plate, which are metal surface materials, and evacuating the space between them. In addition, an aluminum or copper foil is disposed in the vacuum space between the inner member and the outer member to prevent radiant heat transfer, and a getter is disposed to maintain a desired degree of vacuum. Has been.

  When manufacturing this vacuum double structure, an exhaust hole is provided in the outer member, a cylindrical tip tube is joined to the exhaust hole, and after the vacuum exhaust, the tip tube is sealed, The unnecessary part is cut off. Alternatively, a brazing material is disposed around the exhaust hole formed in the outer member, and a plate-shaped sealing member is disposed outside the brazing material. After the vacuum exhaust is performed, the brazing material is melted by heating. Thus, the sealing plate and the outer member are hermetically sealed with the brazing material.

  However, in the former manufacturing method, since the non-cut portion of the tip tube protrudes from the outer member, the design is greatly restricted and the usage is also limited. Moreover, since a cut tip tube of about 50 to 90 mm is generated for each product, there is a lot of waste. In addition, when joining the tip tube to the exhaust hole, a brazing material is required and a cleaning process is required.

  Further, since the latter manufacturing method does not use a tip tube, there are no design restrictions and no unnecessary members such as a cut tip tube. However, since it is necessary to perform evacuation in a vacuum furnace and subsequently perform sealing by melting the brazing material, a large manufacturing facility is required regardless of the number of production, which also increases the cost. There's a problem.

  The present invention solves such a problem, and information on prior art documents related to the vacuum double structure is as follows.

Japanese Patent Laid-Open No. 10-82591

  In this patent document, an outer peripheral portion is joined so that a gap is formed between two metal plates, and one metal plate is provided with an inlet / outlet to which an exhaust device and a steam generator are connected. Yes. And it is set as the structure which seals the said entrance / exit in the sealing state by resistance welding in the state which temporarily sealed the vicinity of the entrance / exit with the caulking tool.

  However, in this vacuum double structure, since the entrance / exit formed in the flat metal plate is sealed by resistance welding, deformation around the entrance / exit cannot be predicted. And when it deform | transforms so that the contact area by joining may become large, since the heat-transfer area to the inside and outside increases, there exists a problem that heat insulation performance falls. On the other hand, when the contact area due to bonding is deformed so as to be too small, there is a problem that the bonding strength is weakened and leakage occurs.

  On the other hand, in the exhaust device described in the patent document, a connection pipe with a vacuum pump or a working fluid vapor generator is connected to an exhaust jig, and a resistance welding electrode is disposed so as to be able to advance and retract with respect to the exhaust jig. The electrode insertion hole and the electrode are sealed with an airtight ring. Therefore, durability is low, and when the sealing performance by the airtight ring is lowered, there is a problem that the vacuum degree of the vacuum space of the vacuum double structure is lowered.

  The present invention has been made in view of conventional problems, and a first object of the present invention is to provide a method for manufacturing a vacuum double structure with stable heat insulation performance for each product. It is a second object to provide a manufactured vacuum double structure.

  In order to solve the above-mentioned problem, the method for manufacturing a vacuum double structure according to the present invention includes providing a recess in the first metal surface material and forming an exhaust hole in the bottom of the recess, thereby forming the first metal surface material. A second metal surface material is disposed in a direction in which the concave portion is depressed so as to face the bottom of the concave portion with a predetermined interval, and a space between the first and second metal surface materials is defined as Exhaust is performed from the exhaust hole by an exhaust means, and an electrode is disposed at a position opposite to the concave portion of the first metal surface material and the concave portion of the second metal surface material, and the bottom of the concave portion of the first metal surface material is disposed The exhaust hole is sealed by joining to the second metal surface material by resistance welding.

  In this manufacturing method, an exhaust hole is formed in a recess provided in advance in the first metal surface material, and the bottom of the recess is joined to the opposing second metal surface material by resistance welding. The deformation area around the hole can be stabilized. As a result, the heat transferable area associated with the joining of the first and second metal surface materials can be stabilized, so that the heat insulation performance for each product can be stabilized and the occurrence of leakage can be prevented.

  In this manufacturing method, the first and second metal surface materials are disposed with a gap of about 1 mm to 1.5 mm between the bottom surface of the recess and the second metal surface material facing the bottom. The resistance welding is preferably performed. In this way, the space between the first and second metal surface materials can be reliably exhausted. Moreover, the deformation | transformation of the circumference | surroundings of the exhaust hole in a 1st metal surface material can be stabilized, and between 2nd metal surface materials can be sealed reliably.

In addition, after the space between the first and second metal surface materials is exhausted to about 10 ⁻¹ Pa by the exhaust means, the exhaust hole is sealed, and heated after sealing to enter the space. It is preferable to activate the arranged getter. Thus, since the exhaust hole is sealed by resistance welding, even if it is heated to a high temperature at which the getter can be activated after sealing, no leakage occurs at the joint portion. Then, by activating the getter in this way, the degree of vacuum in the space between the first and second metal surface materials can be reliably maintained.

  Furthermore, it is preferable that a metal foil that melts at a lower temperature than the metal surface material is disposed at least between the concave portion of the first metal surface material and the second metal surface material. If it does in this way, the adhesion strength between the bottom of the crevice of the 1st metal surface material and the 2nd metal surface material can be improved with metal foil. As a result, it is not necessary to use a brazing material to improve adhesion, so that it is not necessary to install a brazing material on a structural member or apply a flux necessary to improve the wettability of the brazing material. The exhaust hole sealing step can be greatly simplified.

  And the exhaust apparatus applied to the manufacturing method of the present invention has an internal space formed between opposing metal surface materials recessed in one first metal surface material toward the other second metal surface material. A vacuum double-structure exhaust apparatus that exhausts air from an exhaust hole of a recess provided to seal the exhaust hole, and has an opening that exposes the recess and seals the periphery of the recess A member, a first exhaust part that is disposed outside the seal member and extends coaxially with the center line of the opening from the opening, and a second exhaust part that is bent and extends from the first exhaust part. An exhaust jig having a letter-shaped exhaust passage, an insertion hole extending coaxially with the first exhaust part and communicating with the first exhaust part, and surrounding the periphery of the insertion hole of the exhaust jig A telescopic member disposed and stretchable along the axial direction of the insertion hole, and the telescopic portion The movable jig is disposed at the end opposite to the exhaust jig, and is disposed so as to be movable forward and backward with respect to the exhaust jig. A first electrode facing the bottom of the concave portion of the first metal surface material through the inside of the portion, and disposed so as to be located on the opposite side of the first electrode with the first and second metal surface materials interposed therebetween And a second electrode.

  In this exhaust device, after evacuating the space between the first and second metal surface materials, the resistance welding between the bottom of the concave portion of the first metal surface material and the second metal surface material is subsequently performed. Can be applied. And the 1st electrode for performing resistance welding is joined to a movable jig, and since it can advance and retreat with an expansion / contraction member with an expansion / contraction member, the vacuum degree of space is reduced. Therefore, resistance welding can be reliably performed. Moreover, since the elastic member has higher durability than sealing means such as an airtight ring, the usable period can be extended.

  Further, the vacuum double structure of the present invention exhausts the internal space formed between the facing metal surface materials from the exhaust holes formed in one first metal surface material, and seals the exhaust holes. In the vacuum double structure formed as described above, the first metal surface material is provided with a recess that is recessed toward the other second metal surface material, and the exhaust hole is formed in the bottom of the recess, The exhaust hole is sealed by disposing an electrode in the recess and joining the second metal surface material by resistance welding.

  In this vacuum double structure, the concave portion is provided on the outer peripheral portion having a curved surface shape in the first metal surface material.

  Further, the first and second metal surface materials are formed in a cylindrical shape having at least one end opened, and the opening ends are joined to each other, and the recess is preferably provided in the vicinity of the joined portion. In this way, since excessive heat radiation at the intermediate portion can be reduced, it is possible to suppress a decrease in heat insulation performance.

  Since the vacuum double structure manufactured by the method of the present invention and the vacuum double structure manufactured by the method are joined by resistance welding to the second metal surface material facing the bottom of the recess having the exhaust hole, The deformation area around the exhaust hole can be stabilized. As a result, the heat insulation performance of each product can be stabilized and the occurrence of leakage can be prevented.

  Further, in the exhaust device capable of carrying out this manufacturing method, the first electrode for performing resistance welding is joined to the movable jig, and the exhaust jig is advanced and retracted while maintaining a hermetically sealed state by an elastic member. Since it is possible, resistance welding can be reliably performed without reducing the degree of vacuum in the space.

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

  FIG. 1 shows an electric pot 1 equipped with a vacuum double jacket 10 which is a vacuum double structure manufactured by a manufacturing method using an exhaust device 30 according to the present invention. First, the electric pot 1 accommodates and fixes the inner container 3 inside the main body 2, attaches a heater 4 to the bottom of the inner container 3, and executes boiling water control and heat retention control. A pump 5 is disposed at the bottom of the inner container 3, and a pumping pipe 7 is piped from the pump 5 to the spout 6 of the main body 2. Further, a lid 8 is attached to the upper end of the main body 2 by a hinge 9 so as to be openable and closable to prevent heat radiation upward from the upper end opening of the inner container 3. And between the main body 2 and the inner container 3, the cylindrical vacuum double jacket 10 which concerns on this invention is arrange | positioned, and the thermal radiation from the trunk | drum of the inner container 3 to the side is prevented.

  As shown in FIGS. 2A and 3, the vacuum double jacket 10 of the present embodiment includes an outer member (first metal surface material) 14 and an inner member (second metal made) which are cylindrical surface materials. (Surface material) 11 and has a cylindrical shape without a neck.

  First, the inner member 11 has upper and lower end portions 12 </ b> A and 12 </ b> B whose diameter is larger than that of the central portion 13. The outer member 14 has the same length as the inner member 11 and an inner diameter that is slightly larger than the outer diameter of the end portions 12A and 12B of the inner member 11. On the outer surface of the outer member 14, reinforcing protrusions 15 extending annularly in the circumferential direction are formed at a plurality of locations along the longitudinal direction by spreading from the inner side to the outer side. As shown in FIG. 2B, a recess 16 that is recessed inward is provided in the vicinity of the lower opening end of the outer member 14, and an exhaust hole 17 is formed at the center of the bottom of the recess 16. ing.

  Specifically, the outer member 14 is provided with projections 15 at equal intervals from the vicinity of the upper end to the vicinity of the lower end. However, the lowermost protrusion 15A and the second protrusion 15B from the lower side are formed with an interval to form one protrusion 15. In the outer member 14, a non-projection forming portion 18 which is an outer peripheral portion curved so as to form a curved surface is provided with a recess 16 that is recessed toward the inner member 11 so as to form a circular shape having a diameter of about 5 mm. It has been. A circular exhaust hole 17 having a diameter of about 1 mm is provided in the center of the bottom of the recess 16.

  The inner member 11 and the outer member 14 are inserted inside the outer member 14 and their open ends are joined by seam welding. The exhaust hole 17 is positioned in the vicinity of the opening end, which is a joint portion between the inner member 11 and the outer member 14, and is sealed by joining the bottom of the recess 16 to the opposing inner member 11 by spot welding. ing. Here, seam welding is a method in which a metal material is continuously resistance-welded by providing a pair of electrodes having a disk shape, placing a portion to be joined between these electrodes, and applying a predetermined voltage. is there. Spot welding is a method in which a metal material is partially resistance welded by providing a pair of electrodes, at least one of which has a rod shape, placing a portion to be joined between these electrodes, and applying a predetermined voltage. is there.

  Further, as shown in FIGS. 2A and 2B, a metal foil 20 and a getter (not shown) are disposed in a space 19 formed between the inner member 11 and the outer member 14. The metal foil 20 is made of copper or aluminum and is disposed so as to be wound around the outer surface of the central portion 13 of the inner member 11 to prevent radiant heat transfer. The getter is wound so as to be sandwiched between the inner member 11 and the metal foil 20, and maintains a desired degree of vacuum by adsorbing gas generated in the space 19.

  Next, the manufacturing method of the vacuum double jacket 10 which consists of the said structure is demonstrated.

  First, as shown in FIG. 4A, the outer member 14 that is the first metal surface material is formed by winding a stainless steel plate in a cylindrical shape and butting along the longitudinal direction with a TIG (Tungsten Inert Gas). Join by welding. Here, the TIG welding is welding using non-consumable tungsten as an electrode.

  Next, in order to reinforce the load from the lateral (diameter) direction, as shown in FIG. 4B, bead processing is performed so as to bulge outward from the inside. At this time, a plurality of annular projections 15, 15A, 15B are formed at predetermined intervals in the longitudinal direction so that the non-projection forming portion 18 is formed in the vicinity of one end.

  Thereafter, as shown in FIG. 4C, the recess 16 is formed by embossing the non-projection forming portion 18 and the exhaust hole 17 is formed by punching. At this time, the recess 16 is formed with a gap of about 1 mm to about 1.5 mm (see FIG. 6B) between the inner member 11 and the inner member 11 in a state where the inner member 11 is disposed inside the outer member 14. It is formed at a depth (about 1.5 mm to about 2.0 mm in order to make the gap about 3 mm in this embodiment). Here, if the gap between the recess 16 and the inner member 11 is smaller than 1 mm, the interposition of the metal foil 20 is one factor, but the exhaust efficiency is deteriorated. Further, if the gap is larger than 1.5 mm, the joining state (contact area) when the bottom of the recess 16 and the inner member 11 are joined by spot welding is not stable. And in order to stabilize the contact area in a joining state reliably, it is preferable to form a clearance gap at about 1 mm. In the drawing, the recess 16 and the exhaust hole 17 are formed at a position where the outer member 14 is subjected to TIG welding, but the positions are not limited.

  Further, as shown in FIG. 5 (A), the inner member 11 which is the second metal surface material is formed by winding a stainless steel plate into a cylindrical shape having an outer diameter smaller than the inner diameter of the outer member 14 by a size that forms a space 19. The end edges butted along the longitudinal direction are joined by TIG welding.

  Next, as shown in FIG. 5B, flare tube expansion processing is performed on both the opened upper and lower ends 12A and 12B so that the outer diameters of the ends 12A and 12B are slightly smaller than the inner diameter of the outer member 14. Expand the tube. Thereafter, as shown in FIG. 5C, the metal foil 20 is wound in a state where the getter is disposed in the central portion 13 of the inner member 11.

  Next, the inner member 11 is inserted into the outer member 14 in the direction in which the concave portion 16 is depressed, and positioned so that the opening ends thereof are aligned. In this state, the opening ends of the inner member 11 and the outer member 14 are aligned. Join by seam welding.

  Next, as shown in FIG. 6A, the exhaust jig 33 of the exhaust device 30 is disposed in the recess 16 formed in the outer member 14, and the inner member is opposed to the outer member 14 and the inner member 11 therebetween. After the lower electrode is arranged on 11 and the space 19 is evacuated, the exhaust hole 17 is sealed.

  In addition, as shown in FIG. 6 (B), the double structure before sealing is between the outer member 14 and the central portion 13 of the inner member 11, except for the protrusion and the concave portion 16. A preset gap (about 3 mm) is formed. Similarly, a preset gap of about 1 mm is formed between the bottom of the concave portion 16 of the outer member 14 and the central portion 13 of the inner member 11. Further, a metal foil 20 is interposed between the central portion 13 of the inner member 11 and the outer member 14 including the recess 16.

In this state, the exhaust device 30 is operated at a temperature at which the getter is not activated or at an ordinary temperature, and the space 19 is evacuated to about 1 × 10 ⁻¹ Pa. When the target vacuum degree is reached, the exhaust hole 17 is sealed. Thereafter, the plurality of vacuum double jackets 10 are collectively placed in a heating furnace and heated at a high temperature (about 600 ° C.) at which the getter is activated.

  Here, in the case of a conventional sealing method using a chip tube or a sealing plate, it is necessary to use a brazing material for joining them. Therefore, when the getter is heated and activated after sealing, it cannot be heated at a temperature higher than the temperature at which the brazing material melts (about 220 ° C.). As a result, a great limitation has been imposed on the getter to be used.

  However, in this embodiment, since the exhaust holes 17 formed in the outer member 14 are joined by resistance welding, there is no problem of leakage even when heated at a high temperature. As a result, there are no restrictions on the getters that can be used, and the degree of freedom in design can be improved. Thus, by selecting an appropriate getter as desired, the degree of vacuum in the space 19 between the outer member 14 and the inner member 11 can be reliably maintained.

  Next, the exhaust device 30 for sealing the exhaust hole 17 after the space 19 is evacuated will be described in detail.

  First, the exhaust device 30 is disposed on a frame (not shown). This frame is provided with a holding device (not shown) that positions and holds the outer peripheral portion of the outer member 14. As shown in FIGS. 7A and 7B, the exhaust device 30 of the present embodiment is roughly configured by a seal member 31, an exhaust jig 33, a telescopic member 41, a movable jig 45, A configuration including one spot electrode 47 and a second spot electrode 49 is provided.

  The seal member 31 is made of rubber and has a rectangular shape having an arc shape having an inner diameter slightly smaller than the outer diameter of the non-projection forming portion 18 of the outer member 14. An opening 32 that exposes the concave portion 16 of the outer member 14 is formed at the center of the seal member 31, and the space between the outer surface of the outer member 14 is sealed in a region excluding the opening 32. .

  The exhaust jig 33 is made of stainless steel disposed in a sealed state outside the seal member 31. An exhaust passage 35 connected to the vacuum pump 34 is formed in the exhaust jig 33. The exhaust passage 35 has a substantially L-shape having a first exhaust part 36 communicating with the opening 32 of the seal member 31 and a second exhaust part 37 communicating with the first exhaust part 36 in a bent state. Is. The first exhaust part 36 is coaxial with the center line of the opening 32 from the opening 32 of the seal member 31, in other words, directed radially outward connecting the axis of the fixed outer container and the center of the opening 32. It has a circular cross section extending along a straight line. The second exhaust part 37 has a circular cross section extending in a direction orthogonal to the center line of the opening 32 of the seal member 31. A connection pipe 38 connected to the vacuum pump 34 is connected to the open end of the second exhaust part 37. The exhaust jig 33 is provided with an insertion hole 39 that is coaxial with the first exhaust part 36 and extends with the same diameter. The insertion hole 39 is provided so that a first spot electrode 47 (to be described later) can be moved back and forth. The insertion hole 39 forms one hole continuous with the first exhaust part 36, and the concave part 16 is interposed through the first exhaust part 36. And it is comprised so that the exhaust hole 17 may be faced. Further, the inner diameter of the insertion hole 39 is formed larger than the inner diameter of the concave portion 16 of the outer member 14. Further, in the exhaust jig 33, a fixed flange portion 40 protruding outward in the radial direction is provided at an end portion opposite to the first exhaust portion 36.

  The elastic member 41 is a cylindrical member having a bellows shape. The elastic member 41 is made of stainless steel having a wall thickness of about 0.1 mm, and contracts in the axial direction when a predetermined pressure is applied along the axial direction, and is restored to its original shape by its own elastic force by releasing the load ( Stretch). Fixing jigs 42 </ b> A and 42 </ b> B are arranged at both ends of the expansion / contraction member 41 so as to be fixed to the exhaust jig 33 and a movable jig 45 described later in a sealed state. These fixing jigs 42A and 42B are made of a stainless steel disc having the same diameter as the fixing flange portion 40 of the exhaust jig 33, and the end of the elastic member 41 is fixed in a sealed state at the center of one surface thereof. The fixed convex part 43 to be provided is provided. A through hole 44 having a diameter larger than the insertion hole 39 is provided in the center of the fixing jigs 42A and 42B. The elastic member 41 is screwed and fixed to the exhaust jig 33 in a sealed state via the fixing jig 42A so as to surround the periphery of the insertion hole 39 and along the axial direction of the insertion hole 39. It is arranged to be extendable.

  The movable jig 45 is fixed to the fixing jig 42B by being screwed in a sealed state, so that the movable member 45 is made of a stainless steel disc disposed at the end of the telescopic member 41 opposite to the exhaust jig 33. Become. The movable jig 45 is configured to be able to advance toward the exhaust jig 33 by a driving means (not shown) composed of a hydraulic or pneumatic cylinder. A mounting hole 46 is provided in the movable jig 45 so as to be positioned coaxially with the exhaust hole 17.

  The first spot electrode 47 is fixed (joined) in a sealed state by brazing through the mounting hole 46 of the movable jig 45. The first spot electrode 47 is configured such that the application portion 48 at the tip thereof has a slightly smaller cross-sectional diameter than the concave portion 16 of the outer member 14. Thus, the first spot electrode 47 is disposed so as to face the bottom of the concave portion 16 of the outer member 14 through the telescopic member 41, the insertion hole 39 and the opening 32, and the movable jig 45 faces the exhaust jig 33. By being advanced, the application unit 48 is configured to be positioned in the recess 16 while being guided by the outer peripheral portion of the recess 16.

  The second spot electrode 49 is disposed by being inserted from the opening end of the inner member 11 into the inner member 11 on the opposite side of the first spot electrode 47 across the outer member 14 and the inner member 11. It is. The second spot electrode 49 is formed with a circular arc surface 50 along the inner diameter of the inner member 11.

  As shown in FIG. 7 (A), the exhaust device 30 configured as described above is in a state where the cylindrical double structure is positioned and held at a predetermined position by the holding device, and the exhaust jig 33 and the second spot electrode. At 49, the outer member 14 and the inner member 11 are sandwiched. At this time, the movable jig 45 is moved backward by the driving means, so that the first spot electrode 47 has a body portion slightly smaller than the insertion hole 39 in the insertion hole 39, and the first exhaust part 36. Only the application part 48 having a smaller diameter is located in the first exhaust part 36.

  In this state, by operating the vacuum pump 34, the space 19 between the inner member 11 and the outer member 14 is evacuated. When the inside of the space 19 reaches a predetermined degree of vacuum, the exhaust by the vacuum pump 34 is weakened but the exhaust operation is continued, and the drive means is operated to move the movable jig 45 as shown in FIG. Then, the first spot electrode 47 is advanced to place the tip of the application unit 48 at the bottom of the recess 16.

  Then, a voltage is applied between the first and second spot electrodes 47 and 49 while pressing the concave portion 16 with the first spot electrode 47 through the movable jig 45 by the driving means, thereby obtaining the structure shown in FIG. As shown, the bottom of the recess 16 is deformed toward the inner member 11 and joined (resistance welding) with the metal foil 20 interposed therebetween to seal the exhaust hole 17.

  At this time, since the recess 16 of the outer member 14 and the inner member 11 are resistance-welded through the metal foil 20 as described above, a brazing material for joining is used between the outer member 14 and the inner member 11. Without doing so, the adhesion strength between the recess 16 of the outer member 14 and the inner member 11 can be increased. For this reason, it is not necessary to attach the brazing material to the structural member or apply a flux necessary for improving the wettability of the brazing material, and the sealing process of the exhaust hole 17 can be greatly simplified.

  When the sealing of the exhaust hole 17 is completed in this way, the vacuum pump 34 is stopped and the first spot electrode 47 is moved backward by the driving means via the movable jig 45.

  Thus, the vacuum double jacket 10 manufactured by the manufacturing method of the present invention forms the exhaust hole 17 in the concave portion 16 provided in advance in the outer member 14, and the bottom of the concave portion 16 is opposed to the opposing inner member 11. Therefore, the deformation region around the exhaust hole 17 by resistance welding can be stabilized. As a result, the heat transferable area associated with the bonding can be stabilized, so that the heat insulation performance for each product can be stabilized and the occurrence of leakage can be prevented. Moreover, since the recessed part 16 is provided in the vicinity of the junction part of the outer side member 14 and the inner side member 11, the excess heat dissipation in an intermediate part can be reduced, As a result, the fall of heat insulation performance can be suppressed.

  In addition, the exhaust device 30 that executes this manufacturing method joins the first spot electrode 47 for performing resistance welding to the movable jig 45, and is in a sealed state between the exhaust jig 33 by the elastic member 41. Since it can advance and retreat while maintaining, resistance welding can be reliably performed without lowering the vacuum degree of the space 19. Moreover, since the elastic member 41 has high durability compared with sealing means such as an airtight ring, the usable period can be extended.

  In addition, the manufacturing method of the vacuum double structure of this invention and its exhaust apparatus 30 are not limited to the structure of the said embodiment, A various change is possible.

  In particular, the vacuum double structure manufactured by the manufacturing method and the exhaust device 30 is not limited to the vacuum double jacket 10, but is used as a vacuum double bottle used for a thermos bottle and an inner container 3 of an electric pot 1. The present invention can also be applied to vacuum double containers, vacuum double pipes, heat insulation panels, and the like. Further, the surface material is not limited to a separate body such as the inner member 11 and the outer member 14, and in the heat insulating panel having a flat outer shape, it is also possible to constitute a surface material facing each other by bending one plate material. It is.

It is a partially broken side view of an electric pot equipped with a vacuum double jacket which is a vacuum double structure manufactured by the method and apparatus according to the present invention. (A) is a partially broken front view of the vacuum double jacket shown in FIG. 1, and (B) is a partially enlarged sectional view of (A). It is a disassembled perspective view which shows the vacuum double jacket before sealing. (A), (B), (C) is a front view which shows the manufacturing method of an outer member. (A), (B), (C) is a front view which shows the manufacturing method of an inner member. (A) The partially broken front view which shows the state which has arrange | positioned the exhaust apparatus in the jacket, (B) is a fragmentary sectional view which shows the state of the outer member and inner member before sealing. (A), (B) is sectional drawing which shows the structure of an exhaust apparatus.

Explanation of symbols

10 ... Vacuum double jacket (vacuum double structure)
11 ... Inner member (second metal surface material)
14 ... Outer member (first metal surface material)
DESCRIPTION OF SYMBOLS 16 ... Concave part 17 ... Exhaust hole 18 ... Non-projection formation part 19 ... Space 20 ... Metal foil 30 ... Exhaust device 31 ... Sealing member 32 ... Opening part 33 ... Exhaust jig (exhaust means)
34 ... Vacuum pump 35 ... Exhaust passage 36 ... First exhaust part 37 ... Second exhaust part 38 ... Connection pipe 39 ... Insertion hole 41 ... Expandable member 45 ... Movable jig 47 ... First spot electrode 49 ... Second spot electrode

Claims (8)

While providing a recess in the first metal surface material, forming an exhaust hole in the bottom of the recess,
A second metal surface material is disposed in the direction in which the concave portion of the first metal surface material is recessed so as to face the bottom of the concave portion with a predetermined interval;
Exhausting the space between the first and second metal surface materials from the exhaust hole by an exhaust means;
An electrode is disposed at a position opposite to the concave portion of the first metal surface material and the concave portion of the second metal surface material, and the bottom of the concave portion of the first metal surface material is used as the second metal surface material. A method of manufacturing a vacuum double structure, wherein the exhaust holes are sealed by joining by resistance welding.   The first and second metal surface materials are disposed with a gap of about 1 mm to 1.5 mm between the second metal surface material facing the bottom of the recess, and the resistance welding is performed. The manufacturing method of the vacuum double structure of Claim 1 characterized by the above-mentioned. The space between the first and second metal surface materials is evacuated to about 10 ⁻¹ Pa by the evacuation means, and then the exhaust holes are sealed and heated after the sealing to be disposed in the space. The method for producing a vacuum double structure according to claim 1 or 2, wherein the obtained getter is activated.   4. A metal foil that melts at a lower temperature than the metal surface material is disposed at least between the concave portion of the first metal surface material and the second metal surface material. The manufacturing method of the vacuum double structure of any one of these. The internal space formed between the opposing metal surface materials is exhausted from an exhaust hole in a recess provided in one first metal surface material so as to be recessed toward the other second metal surface material, A vacuum double structure exhaust device for sealing a hole,
A seal member having an opening for exposing the recess, and sealing the periphery of the recess;
A substantially L-shape having a first exhaust part that is disposed outside the seal member and extends coaxially with the center line of the opening from the opening and a second exhaust part that bends and extends from the first exhaust part. An exhaust jig having an exhaust passage and an insertion hole extending coaxially with the first exhaust part and communicating with the first exhaust part;
An expansion / contraction member disposed so as to surround a periphery of the insertion hole of the exhaust jig, and expandable / contractable along the axial direction of the insertion hole;
A movable jig disposed at an end of the telescopic member opposite to the exhaust jig and disposed so as to be capable of moving forward and backward with respect to the exhaust jig;
A first electrode that penetrates and is fixed to the movable jig and faces the bottom of the concave portion of the first metal surface material through the elastic member and the opening;
A second electrode disposed on the opposite side of the first electrode with the first and second metal surface materials interposed therebetween;
A vacuum double structure exhaust apparatus comprising: In the vacuum double structure formed by exhausting the internal space formed between the opposing metal surface materials from the exhaust holes formed in one first metal surface material, and sealing the exhaust holes,
The first metal surface material is provided with a recess that is recessed toward the other second metal surface material, and the exhaust hole is formed at the bottom of the recess.
The vacuum double structure according to claim 1, wherein the exhaust hole is sealed by disposing an electrode in the recess and joining the second metal surface material by resistance welding.   The vacuum double structure according to claim 6, wherein the concave portion is provided in an outer peripheral portion having a curved surface shape in the first metal surface material.   The first and second metal surface materials have a cylindrical shape with at least one end opened, and the opening ends are joined to each other, and the concave portion is provided in the vicinity of the joined portion. A vacuum double structure according to claim 6 or claim 7.

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