JP2015199130A - Brazing vent tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform vacuum drawing of a vacuum double container for sealing, without using a large scale appliance.SOLUTION: A brazing material is disposed on a recess part 155 and a brazing vent tool 301 is attached to a port 156, with respect to a vacuum double container 151 comprising the recess part 155 which becomes dent toward an inner bottle 153 side, and the port 156 disposed in the recess part 155 and having a female screw part 157 on its inner peripheral face, and vacuum drawing of the vacuum double container 151 is performed via a gas injection and vent tool, and the brazing material is heated through a glass body 308 of the gas injection and vent tool for sealing the port 156.

Description

  The present invention is a vacuuming and sealing method for evacuating a vacuum double container without using a large facility, a gas injection and exhaust tool for injecting an inert gas used in this, and The present invention relates to a brazing exhaust tool.

  In Patent Document 1, the outer surface of the outer bottle of the thermos bottle and the inner surface of the inner bottle are exposed to an inert gas, the closed space is evacuated while heating, and the tip tube protruding from the bottom of the thermos is sealed. Have been described.

  Patent Document 2 describes that the inner space of the thermos is heated to be evacuated, and the exhaust holes provided in the concave portions on the bottom of the thermos are sealed using a metal plate. Providing an exhaust hole in the concave portion on the bottom of the thermos is also described in Patent Document 3.

  Patent Document 4 describes a process of [purge of adsorbed gas by heating] → [enclosure of inert gas] → [purge of inert gas].

JP 2004-065393 A Japanese Patent Laid-Open No. 2004-057675 JP-A-11-137451 Japanese Patent Application Laid-Open No. 2004-060852

The inventor has doubts about a general vacuuming operation process (see Patent Document 1) performed by arranging a vacuum double container in a huge vacuum chamber, and has a large vacuuming with a vacuum double container. We wanted to realize it easily without using any equipment. Then, a new vacuum double container evacuation and sealing operation process as described below was assumed.
(1) A hollow that is recessed inside is provided on the bottom surface of the outer side of the vacuum double container (so-called thermos), and a port for vacuuming is provided in this recess.
(2) When hydrogen or the like enters the space (closed space) between the outer bottle and the inner bottle of the vacuum double container, it causes deterioration of the vacuum double container. Therefore, an inert gas such as argon is injected to drive out gas molecules such as hydrogen in the closed space, and then the closed space is evacuated to seal the port.

  Here, when proceeding with the above-described operation process without using a large-scale facility, [1] a tool for injecting an inert gas into the port (gas injection and exhaust tool), [2] vacuum It is important that the pulling tool (brazing exhaust tool) can be attached and detached manually.

  The object of the present invention is to evacuate and seal the vacuum double container without using large-scale equipment.

  The vacuum drawing and sealing method of the present invention comprises an outer bottle and an inner bottle, a recess provided on the outer bottle and recessed toward the inner bottle, and a first portion protruding from the recess in a direction away from the inner bottle. Vacuum evacuation and sealing for a vacuum double container having a port having at least one of a second portion protruding from the recess in a direction approaching the inner bottle and a female screw portion formed on the inner peripheral surface of the port (A) a gas ejecting portion including a mounting portion to which a gas source is detachably mounted, a gas flow passage through which gas from the gas source passes, and (b) a female screw portion of the port A connector part including a connecting male screw part that can be screwed to the connecting part, and a vent path extending from an end of the connecting male screw part, and (c) the gas flow path and the vent path communicate with each other. A gas injection / exhaust unit comprising a gas ejection part and an operation part for connecting the connector part. A first attachment step of attaching a tool to the port; a baking step of evacuating and heating the vacuum double container via the gas injection and exhaust tool following the first attachment step; and the baking step. Subsequently, an injecting step of injecting an inert gas into the vacuum double vessel through the gas injection / exhaust tool, and following the injection step, the gas injection / exhaust tool is removed from the vacuum double vessel. Removing and capping the port, and following the cap step, a brazing material is disposed in the recess, and (p) a suction path for suction by a vacuum pump; and (q) the suction path A communication path connecting the ports; (r) a seal portion that prevents leakage when the communication path communicates with the port; and (s) a part of an outer wall of the communication path, Arranged A brazing exhaust tool having a light transmitting portion for transmitting light for melting the brazing material, and a second mounting step for mounting the brazing exhaust tool on the port; and, following the second mounting step, via the gas injection and exhaust tool. A vacuuming step of evacuating the vacuum double container, and a brazing step of sealing the port by heating the brazing material through the light-transmitting part of the gas injection / exhaust tool following the vacuuming step. And comprising.

  The gas injection / exhaust tool of the present invention comprises an outer bottle and an inner bottle, a recess provided in the outer bottle and recessed toward the inner bottle, a first portion protruding from the recess in a direction away from the inner bottle, and an inner part Gas injection / exhaust gas used for a vacuum double container having a port having at least one of a second portion protruding from the recess in a direction approaching the bottle and a female screw portion formed on the inner peripheral surface of the port A tool for connecting a gas source to a detachable mounting portion, a gas ejection portion including a gas flow path through which gas from the gas source passes, and a threaded connection to the female thread portion of the port A connector part including a male screw part, a vent path extending from an end of the connecting male screw part, and the gas ejection part and the connector part are connected so that the gas flow path and the vent path communicate with each other. And an operation unit.

  The brazing exhaust tool of the present invention comprises an outer bottle and an inner bottle, a recess provided in the outer bottle and recessed toward the inner bottle, a first portion protruding from the recess in a direction away from the inner bottle, and the inner bottle A brazing exhaust tool used for a vacuum double container having a port having at least one of a second portion protruding from a recess in a direction approaching from a concave portion and a female screw portion formed on an inner peripheral surface of the port A suction path for suction by a vacuum pump; a communication path connecting the suction path and the port; a seal portion for preventing leakage when the communication path and the port communicate with each other; and A translucent part that constitutes a part of the outer wall and transmits light for melting the brazing material disposed in the communication path.

  According to the present invention, the vacuum double container can be evacuated and sealed without using large-scale equipment.

It is a front view of a gas injection and exhaust tool. It is sectional drawing of a gas injection and exhaust tool and a vacuum double container. It is a disassembled perspective view of a gas ejection jig and a movable jig. It is a disassembled perspective view of a connector jig. It is sectional drawing in the state which attached the connector jig to the vacuum double container. It is sectional drawing in the state which attached the gas ejection jig to the vacuum double container. It is a top view of a vacuum drawing tool. It is CC sectional view taken on the line of FIG. It is a disassembled perspective view of a brazing exhaust tool. It is a top view of a flange material. It is a K arrow line view of FIG. 7 which shows a flange material. It is a bottom view of a lid material. It is a piping diagram of a vacuum drawing and sealing system. It is a flowchart which shows the flow of the vacuum drawing and sealing method. It is a flowchart which shows the flow of the vacuum drawing and sealing method following FIG. It is a flowchart which shows the flow of the vacuum drawing and sealing method following FIG. It is a flowchart which shows the flow of the vacuum drawing and sealing method following FIG.

The outline of the work process of the vacuum double container evacuation and sealing, which the inventor considered, is as follows.
(1) A hollow that is recessed inside is provided on the bottom surface of the outer side of the vacuum double container (so-called thermos), and a port for vacuuming is provided in this recess.
(2) When hydrogen or the like enters the space (closed space) between the outer bottle and the inner bottle of the vacuum double container, it causes deterioration of the vacuum double container. Therefore, an inert gas such as argon is injected to drive out gas molecules such as hydrogen in the closed space, and then the closed space is evacuated to seal the port.

  In the above-described work process considered by the inventor, [1] a tool for injecting an inert gas into the port (gas injection / exhaust tool), [2] a tool for vacuuming (brazing exhaust) Tool) is manually attached and detached. In this embodiment, first, the outline is described, the gas injection / exhaust tool 101 is described, the brazing exhaust tool 301 is described, and finally, the gas injection / exhaust tool 101 and the brazing exhaust tool 301 are used. A vacuuming and sealing method will be described.

  One embodiment will be described with reference to FIGS.

[Overview]
First, an outline of the present embodiment will be described based on FIG. 1 and FIG. Here, the vacuum double container 151 is also described. FIG. 1 is a front view of a gas injection / exhaust tool 101. FIG. 2 is a cross-sectional view of the gas injection / exhaust tool 101 and the vacuum double container 151. The vacuum double container 151 includes an outer bottle 152 and an inner bottle 153 accommodated in the outer bottle 152. For example, the outer bottle 152 and the inner bottle 153 are made of stainless steel such as SUS304. The outer bottle 152 and the inner bottle 153 are joined to each other (both not shown), and an internal space 154 is formed between the outer bottle 152 and the inner bottle 153. Further, a copper foil (not shown) for preventing radiation is wound around the outer periphery of the inner bottle 153. A getter material (not shown) is disposed in the internal space 154.

  In the present embodiment, the vacuum double container 151 is placed on a work table or the like with its opening side (not shown) facing downward, and the bottom surface 154A of the vacuum double container 151 is directed upward. The outer bottle 152 is provided with a recess 155 that is recessed from the bottom surface 154A toward the inner bottle 153 side. A port 156 protrudes from the recess 155 toward the outside of the vacuum double container 151. The tip of the port 156 does not protrude outward from the surface formed by the bottom surface 154A. A female screw portion 157 is provided on the inner peripheral surface of the port 156.

  As another embodiment, the port 156 may protrude from the recess 155 into the internal space 154 toward the inner bottle 153 side of the vacuum double container 151.

  As yet another embodiment, the port 156 protrudes into the internal space 154 from the recess 155 toward the outside of the vacuum double container 151 and from the recess 155 toward the inner bottle 153 of the vacuum double container 151. And may have a portion.

  In this embodiment, the gas injection / exhaust tool 101 is attached to the port 156 for such a vacuum double container 151, and the vacuum double container 151 is evacuated and heated via the gas injection / exhaust tool 101. (Baking step), an inert gas is injected into the vacuum double container 151 via the gas injection / exhaust tool 101, the gas injection / exhaust tool 101 is removed from the vacuum double container 151, and a cap plug is attached to the port 156. Then, a brazing material is disposed in the recess 155 and a brazing exhaust tool 301 (see FIG. 7 and the like) is attached to the port 156, and a predetermined heat insulating effect is obtained for the vacuum double container 151 via the gas injection and exhaust tool 101. A vacuum is drawn until the degree of vacuum is reached, the brazing material is heated through the glass body 308 of the gas injection / exhaust tool 101, and the port 156 is sealed. Sealing Shi pulling vacuum of the vacuum double container without using equipment. The outline of such a process will be described later with reference to FIGS.

[Gas injection and exhaust tool]
Hereinafter, the gas injection / exhaust tool 101 will be described with reference to FIGS. First, FIG. 1 and FIG. 2 will be referred to. The gas injection / exhaust tool 101 is formed of a metal material such as iron, nickel, and stainless steel having heat resistance to the extent that it can withstand a baking process (described later). The gas injection / exhaust tool 101 includes a gas ejection jig 102 as a gas ejection part, a connector jig 103 as a connector part, and a movable jig 104 as an operation part. Further, a first gasket 105 and a second gasket 106 are used to connect the gas injection / exhaust tool 101 to the port of the vacuum double container 151. The first gasket 105 and the second gasket 106 are both ring-shaped flat plates. The first gasket 105 and the second gasket 106 are preferably formed of oxygen-free copper.

  FIG. 3 is an exploded perspective view of the gas ejection jig 102 and the movable jig 104. Please refer to FIG. 1, FIG. 2 and FIG. The gas ejection jig 102 is configured by fixing and attaching a sealing member 112 to a jig body 111 by welding or the like.

The jig body 111 is a member formed of a metal material. The jig body 111 has a long cylindrical portion 113. A tapered portion 114 protrudes from one end surface of the cylindrical portion 113. The other end face of the cylindrical portion 113 is provided with a mounting portion 115 to which a gas source (see FIG. 13) of an inert gas such as argon gas, nitrogen or carbon dioxide can be attached or detached.
A gas flow path 116 extending in the length direction of the jig main body 111 is formed in the jig main body 111 so as to penetrate all of the attachment portion 115, the cylindrical portion 113, and the tapered portion 114. The inner diameter of the gas flow path 116 is preferably larger than the bolt head 129 (see FIG. 4 and the like) of the bolt body 121. Further, the sealing member 112 is formed of a metal material and has a short cylindrical shape. The inner diameter of the sealing member 112 is the same as the outer diameter of the cylindrical portion 113.

  The movable jig 104 is formed of a metal member and has a short cylindrical shape. On one end face of the movable jig 104, a sealing portion 118 having a fitting hole 117 that fits into the outer periphery of the cylindrical portion 113 and closing the outer side thereof is formed. The other end surface of the movable jig 104 is opened larger than the fitting hole 117, and the inner periphery of the movable jig 104 is screwed into the male screw portion 123 (see also FIG. 4) of the cylindrical jig 122. A female screw portion 119 is formed. On the outer periphery of the cylindrical portion 113, flat portions 120 extending in the length direction of the cylindrical portion 113 are provided at two symmetrical positions when the cylindrical portion 113 is viewed in a cross-sectional view.

  The gas ejection jig 102 is formed as follows. First, the movable jig 104 is positioned on the outer periphery of the cylindrical portion 113 by fitting the cylindrical portion 113 into the fitting hole 117. Subsequently, the sealing member 112 is fitted and inserted so as to be aligned with the end portion on the tapered portion 114 side on the outer periphery of the cylindrical portion 113. Subsequently, the sealing member 112 and the cylindrical portion 113 are fixed by welding or the like. As a result, the movable jig 104 is slidable in the length direction of the cylindrical portion 113, and is further rotatable in the circumferential direction of the cylindrical portion 113, but is movable by the mounting portion 115 and the sealing member 112. It will not fall out of 104. Here, the sealing member 112 serves as a retaining portion.

  FIG. 4 is an exploded perspective view of the connector jig 103. Please refer to FIG. 1, FIG. 2 and FIG. The connector jig 103 is configured by assembling a bolt body 121 to a cylindrical jig 122.

The cylindrical jig 122 is made of a metal material, has a cylindrical shape, and has a chamfered edge portion. On the outer periphery of the cylindrical jig 122, a male screw part 123 into which the female screw part 119 of the movable jig 104 is screwed and a flat part 124 extending in the length direction of the cylindrical jig 122 are formed. The planar portion 124 is provided at two locations that are symmetrical when the cylindrical jig 122 is viewed in cross-section. A first insertion hole 125 into which the tapered portion 114 (see also FIG. 3) of the gas ejection jig 102 enters is formed at one end of the cylindrical jig 122. The second gasket 106 (see FIGS. 2, 5, and 6) and the bolt body 121 are also inserted into the first insertion hole 125. Further, a second insertion hole 126 into which the port 156 of the vacuum double container 151 enters is formed at the other end of the cylindrical jig 122. Further, the cylindrical jig 122 is provided with a female screw hole 127 that penetrates the first insertion hole 125 and the second insertion hole 126 along the axis.

  The bolt body 121 includes a bolt shaft 128 that is screwed into the female screw hole 127 of the cylindrical jig 122, and a bolt head 129 that is positioned at the end of the bolt shaft 128. As shown in FIG. 4, the bolt head 129 may have a short column shape, but may have a short prismatic shape (for example, a hexagonal column shape). A wrench hole 130 for inserting a hexagon wrench (not shown) and screwing the bolt body 121 into the female screw hole 127 is formed on the end face of the bolt head 129. In the bolt body 121, an air passage 131 that extends from the wrench hole 130 along the axis of the bolt shaft 128 and opens at the tip of the bolt shaft 128 is provided.

  In the connector jig 103, the bolt body 121 is inserted into the first insertion hole 125 of the flat surface portion 124 from the bolt shaft 128 side, the bolt shaft 128 is screwed into the female screw hole 127, and the tip of the female screw hole 127 is a cylinder. The jig 122 protrudes outward from the end surface on the second insertion hole 126 side. When screwing the bolt body 121 into the female screw hole 127, a hexagon wrench (not shown) is introduced from the first insertion hole 125, and the tip of the hexagon wrench (not shown) is fitted into the wrench hole 130. Rotate the gripping part (not shown) of the hexagon wrench. At this time, it is not always necessary to tighten the bolt body 121 until the bolt head 129 is brought into contact with the inner bottom surface of the first insertion hole 125.

  The procedure for attaching the gas injection / exhaust tool 101 to the vacuum double container 151 will be described below with reference to FIGS. FIG. 5 is a cross-sectional view of the connector jig 103 attached to the vacuum double container 151. First, the operator places the vacuum double container 151 on a work table or the like with the opening side (not shown) facing downward, positions the recess 155 upward, and the port 156 protrudes upward. To. Subsequently, the operator places the first gasket 105 in the recess 155 so that the port 156 is positioned inside the first gasket 105. Subsequently, the operator screws the tip of the bolt shaft 128 protruding from the cylindrical jig 122 into the female screw portion 157 in the port 156. Here, the bolt shaft 128 serves as a connecting male screw portion. At this time, the operator can easily rotate the cylindrical jig 122 by sandwiching the two flat portions 124 provided on the cylindrical jig 122 by hand.

FIG. 6 is a cross-sectional view of the gas ejection jig 102 attached to the vacuum double container 151. Following the state shown in FIG. 5, the operator inserts the second gasket 106 into the gap S (see FIG. 5) formed between the inner peripheral surface of the first insertion hole 125 and the outer peripheral surface of the bolt head 129. Place. The first insertion hole 125 is opened upward, and the operator only has to throw the second gasket 106 into the first insertion hole 125. Subsequently, the operator holds the movable jig 104 in his hand and lifts the movable jig 104 upward so that the detail 114 and the sealing member 112 are exposed, and the tip of the detail 114 protrudes from the cylindrical portion 113. Is inserted from the first insertion hole 125, and the end surface of the tapered portion 114 is
Contact the gasket 106. Thereby, the first gasket 105 is firmly sandwiched between the inner bottom surface of the recess 155 and the end surface of the cylindrical jig 122.

  Reference is again made to FIG. Following the state shown in FIG. 5, the operator moves the movable jig 104 downward to screw the female screw part 119 into the male screw part 123 of the cylindrical jig 122. At this time, the operator can easily rotate the movable jig 104 by sandwiching the two flat portions 120 provided on the movable jig 104 by hand. When the movable jig 104 moves downward, the inner bottom surface of the movable jig 104 pushes the upper surface of the sealing member 112 downward. Along with this, the cylindrical portion 113 moves downward, and the second gasket 106 is firmly sandwiched between the inner bottom surface of the first insertion hole 125 and the end surface of the tapered detail 114.

  By following the procedure described above, the gas injection / exhaust tool 101 is attached to the vacuum double container 151, and the gas flow path 116, the vent path 131, the port 156, and the internal space 154 of the vacuum double container 151 are in the air. Communicate without leaking.

With the gas injection / exhaust tool 101 attached to the vacuum double container 151, the operator can use the vacuum double container 151 and a part of the gas injection / exhaust tool 101 (for example, the connector jig 103, the movable jig 104 The portion of the cylindrical portion 113 on the connector jig 103 side) is placed in a heating furnace, the vacuum pump (see FIG. 13) is driven, and the vacuum double container 151 is heated (baking process), thereby obtaining a vacuum double container. Moisture and oil contained in the inner space 154 of 151 and the inner peripheral surface of the outer bottle 152 and the inner bottle 153 on the inner space 154 side pass through the port 156, the air passage 131, and the gas passage 116 in this order. As a result, the formation of an oxide film on the outer surface of the outer bottle 152 and the inner bottle 153 and the inner peripheral surface on the inner space 154 side can be prevented. Thereafter, the valve (see FIG. 13) is switched, and an inert gas (for example, argon gas) from the gas source (see FIG. 13) can be sent into the internal space 154 of the vacuum double container 151.

  Thus, the internal space in the vacuum double container 151 is obtained by screwing the bolt shaft 128 of the bolt body 121 to the female screw portion 157 formed on the inner peripheral surface of the port 156 of the vacuum double container 151. It becomes possible to perform evacuation of 154 or to send an inert gas into the internal space 154.

  In addition, when removing the connector jig | tool 103 from the port 156 of the vacuum double container 151, an operator will work by the procedure reverse to the above. That is, the movable jig 104 is turned to remove it from the connector jig 103, the movable jig 104 is lifted upward, and in this state, the connector jig 103 is turned so that the tip of the bolt shaft 128 in the connector jig 103 is connected to the port 156. Remove from the female screw portion 157.

[Brazing exhaust tool]
Hereinafter, the brazing exhaust tool 301 will be described with reference to FIGS. FIG. 7 is a plan view of the brazing exhaust tool 301. 8 is a cross-sectional view taken along line CC in FIG. FIG. 9 is an exploded perspective view of the brazing exhaust tool 301. FIG. 10 is a plan view of the flange material 303. FIG. 11 is a view taken along the arrow K in FIG. FIG. 12 is a bottom view of the lid member 302.

  The brazing exhaust tool 301 includes a lid member 302, a flange member 303, a vacuum nozzle 304, a first cooling water nozzle 305, a second cooling water nozzle 306, a sealing O-ring 307 as a seal portion, A glass body 308 as a light transmitting portion and a sealing material 309 are included. As an example, the lid member 302, the flange member 303, the vacuum nozzle 304, the first cooling water nozzle 305, and the second cooling water nozzle 306 are made of stainless steel of SUS304.

  The flange material 303 will be described with reference to FIGS. 8, 9, 10, and 11. The flange material 303 has a disk shape. At the center of the flange member 303, there are a tapered hole portion 313 that narrows from the upper surface 311 toward the lower surface 312 and a cylindrical hole portion 314 that opens in a cylindrical shape from the lower end portion of the tapered hole portion 313 toward the lower surface 312. It is open.

  In the flange member 303, a ring-shaped engaging portion 315 that fits into the concave portion 155 of the vacuum double container 151 protrudes from the lower edge of the cylindrical hole portion 314. An O-ring groove 316 provided concentrically with the engaging portion 315 is provided on the lower surface 312 of the flange member 303. A sealing O-ring 307 is fitted into the O-ring groove 316. As an example, the sealing O-ring 307 is made of fluorinated rubber.

  In the flange member 303, the suction path 317 extends radially from the middle of the tapered hole portion 313 toward the side surface of the flange member 303 in parallel with the upper surface 311 and the lower surface 312. Here, the tapered hole portion 313 and the cylindrical hole portion 314 constitute a “communication path” in the scope of claims. And the glass body 308 comprises a part of outer wall of this connection path.

  A step portion 318 is formed on the upper surface 311 of the flange member 303. The step portion 318 has a shape in which a small margin is left in a ring shape from the upper edge of the tapered hole portion 313 in a circular outer direction, and the ring-shaped portion is stepped down on the lower surface 312. The step portion 318 is provided with a “C” -shaped flowing water groove 319 extending concentrically with the tapered hole portion 313 and the cylindrical hole portion 314 in a plan view. The flowing water groove 319 does not communicate with the suction path 317. From both ends of the water flow groove 319, the first water flow channel 320 and the second water flow channel extend radially in parallel with the upper surface 311 and the lower surface 312 toward the side surface of the flange member 303.

  The vacuum nozzle 304, the first cooling water nozzle 305, and the second cooling water nozzle 306 will be described with reference to FIGS. 7, 8, 9, 10, and 11. FIG. The vacuum nozzle 304 is a cylindrical member. One end side of the vacuum nozzle 304 is tapered and welded so as to communicate with a suction path 317 opened on the side surface of the flange member 303. A female screw portion 321 is formed on the other end side of the vacuum nozzle 304. A vacuum quotation pipe (not shown) is screwed to the female thread portion 321. The first cooling water nozzle 305 has a structure similar to that of the vacuum nozzle 304, and is a cylindrical member. It is welded and attached so as to communicate, and a female screw portion is formed on the other end side. The second cooling water nozzle 306 has a structure similar to that of the vacuum nozzle 304 and the first cooling water nozzle 305 and is a cylindrical member having one end tapered and opened on the side surface of the flange member 303. A female screw portion 321 is welded and attached so as to communicate with the female screw portion 321, and a female screw portion is formed on the other end side.

  The lid member 302 will be described with reference to FIGS. 7, 8, 9, and 12. The lid member 302 is a ring-shaped flat plate. As shown in FIG. 8, the lower surface 322 of the lid member 302 is fitted into the step portion 318 of the flange member 303. On the lower surface 322 of the lid member 302, a relief groove 323 extends along the outer peripheral edge of the flowing water groove 319 of the flange member 303. The escape groove 323 serves as an air escape path when water flows through the water flow groove 319.

  In the center of the lid member 302, a central hole 325 that opens in a columnar shape opens from the upper surface 324 to the lower surface 322 thereof. A glass fitting portion 326 into which the disk-shaped glass body 308 is fitted is formed on the upper surface 324 of the lid member 302. The glass fitting portion 326 falls to the lower surface 322 side from the upper surface 324 of the lid member 302 and expands concentrically with the center hole portion 325 in plan view. On the outer periphery of the glass fitting portion 326, a sealing material groove 327 formed to be recessed toward the lower surface 322 is provided. A sealing material 309 is fitted in the sealing material groove 327. The sealing material 309 is sandwiched between the lid member 302 and the glass body 308 inserted into the glass fitting portion 326. As an example, the sealing material 309 is made of fluorinated rubber.

  The brazing exhaust tool 301 is configured by welding and joining the lid member 302 and the flange member 303 in a state where the step portion 318 of the flange member 303 and the lower surface 322 of the lid member 302 are in contact with each other.

  The procedure for brazing the port 156 of the vacuum double container 151 using the brazing exhaust tool 301 will be described below with reference to FIG. As a premise of the brazing operation, in the vacuum double container 151, the cap plug (see FIG. 15) is fitted to the port 156 of the vacuum double container 151 by the process shown in FIGS. Assume that the port 156 does not leak. Further, a pipe (not shown) connected to a vacuum pump (not shown) is screwed to the female thread portion 321 of the vacuum nozzle 304 of the brazing exhaust tool 301 via an O-ring (not shown). It shall be. Each of the first cooling water nozzle 305 and the second cooling water nozzle 306 of the brazing exhaust tool 301 is provided with a pipe (not shown) connected to a running water pump (not shown) as a sealing material (not shown). It shall be screwed through.

  The operator first places a brazing material (see FIG. 16) in the recess 155 of the vacuum double container 151. Subsequently, the operator removes the cap stopper fitted to the port 156 of the vacuum double container 151, and immediately after that, the engaging portion 315 of the brazing exhaust tool 301 is fitted into the recess 155 of the vacuum double container 151. Then, the sealing O-ring 307 is pressed against the bottom surface 154A of the vacuum double container 151, and the vacuum pump is driven in this state. As a result, the inert gas in the internal space 154 of the vacuum double container 151 passes through the port 156, the cylindrical hole 314, the tapered hole 313, and the suction path 317, and is sucked by the vacuum pump through the vacuum nozzle 304. The Here, the sealing O-ring 307 prevents leakage when the cylindrical hole portion 314 and the port 156 communicate with each other. At this time, due to the negative pressure due to the suction pressure, the glass body 308 is strongly sucked toward the vacuum double container 151 side, and the sealing inside and outside of the brazing exhaust tool 301 by the sealing material 309 is ensured.

  Subsequently, the worker uses the light source to apply light from the light source through the glass body 308 to the brazing material placed in the recess 155. A near-infrared heater point condensing type light source is used as the light source. By irradiating the brazing material with the light source, the brazing material is melted and the port is sealed. At this time, the operator drives the water flow pump to pass the running water through the water flow groove 319. As a result, the lid member 302, the flange member 303, the sealing O-ring 307, the glass body 308, the sealing material 309, etc. are melted or damaged, and further, the vacuum double container 151 (especially the outside thereof) to which the brazing exhaust tool 301 is in contact. The bottle 152 can prevent the heat distortion in the vicinity of the recess 155).

  Subsequently, the operator lifts the brazing exhaust tool 301 and separates the brazing exhaust tool 301 from the vacuum double container 151.

  After the internal space 154 of the vacuum double container 151 is filled with the inert gas, the operator can perform the evacuation of the inert gas and seal the port 156 even outside the heating furnace (see FIG. 13). Can be performed at the same time, and these can be performed at once. That is, after the baking process is finished, the vacuum double container 151 with the port 156 closed by the cap stopper is attached to the brazing exhaust tool 301, and the vacuum pump (see FIG. 13) is driven there to drive the vacuum double container 151. An inert gas (for example, argon gas) in the internal space 154 is evacuated, and then the vacuum pump is stopped or the valve (see FIG. 13) is closed to melt the brazing material with the light source. Thus, the port 156 can be sealed. Thereafter, the operator removes the brazing exhaust tool 301 from the vacuum double container 151.

[Vacuum and sealing method]
A method for evacuating and sealing the vacuum double container 151 using the gas injection / exhaust tool 101 and the brazing exhaust tool 301 described so far will be described. FIG. 13 is a piping diagram of the vacuuming and sealing system. 14 to 17 are flowcharts showing the flow of the vacuuming and sealing method. In FIG. 13, the gas injection and exhaust tool 101 may be shown as “baking vacuum exhaust tool”, and the brazing exhaust tool 301 may be shown as “brazing vacuum exhaust tool”. 151 may be indicated as “work” and the light source may be indicated as “collecting heater”. These notations may also be used in FIGS.

The vacuuming and sealing method described in the present embodiment is the same as described above for the outer bottle 152 and the inner bottle 15.
3, a recess 155 provided in the outer bottle 152 and recessed toward the inner bottle 153, and the inner bottle 15
3 is performed on the vacuum double container 151 having a port 156 protruding from the recess 155 in a direction away from 3, and a female screw portion 157 formed on the inner peripheral surface of the port 156.
(A) A step of attaching the gas injection / exhaust tool 101 to the port 156 (first attachment step);
(B) Subsequent to the first attachment step, the vacuum double vessel 151 is evacuated and heated via the gas injection and exhaust tool 101 (baking step);
(C) Subsequent to the baking step, a step of injecting an inert gas such as argon gas into the vacuum double container 151 via the gas injection and exhaust tool 101 (injection step);
(D) Following the injection step, the step of removing the gas injection and exhaust tool 101 from the vacuum double container 151 and plugging the port 156 with a cap (cap step);
(E) Subsequent to the cap step, a brazing material is disposed in the recess 155, and the brazing exhaust tool 301 is attached to the port 156 (second attaching step);
(F) Subsequent to the second attachment step, a step of evacuating the vacuum double container 151 via the gas injection and exhaust tool 101 (evacuation step);
(G) Following the evacuation step, the brazing material is heated through the glass body 308 of the gas injection and exhaust tool 101 to seal the port 156 (a brazing step);
Is included. Details of the vacuuming and sealing method are shown in FIGS. According to such a vacuuming and sealing method, the vacuum double container can be vacuumed and sealed without using a large-scale facility.

  The idea of the inventor up to the idea of the vacuuming and sealing method as described above and the idea emphasized by the inventor will be described below.

  The inventor had five things aimed at the conception stage in creating a vacuum insulated double container. The first was to make the sealing port reusable. This is because if there are many defective products before completion at a small company / manufacturing site, there is a possibility that problems such as increased cost and increased post-processing may occur if there is no means that can handle corrections. . In this respect, in this embodiment, since the port is a screw type, even if it fails, if the same or larger size screw is opened together with the brazing material, the nonconforming product can be corrected. .

  The second was to make it possible to produce vacuum double containers even in small quantities of many varieties. That is, it was necessary to be able to attach and detach the tool in a short time and to be baked or sealed regardless of the size and shape of the workpiece. Normally, the product is placed in a furnace and baked, but even if the size of the product is enormous, like the Statue of Liberty, even if a rubber heater and insulation are wrapped around it A vacuum insulation container can be created. Moreover, it is possible to work while the process is exactly the same.

  The third was whether it could be confirmed whether or not the vacuum double container could be sealed in a state where the high vacuum state was reliably maintained. Usually, after vacuuming under a low vacuum, put the getter material (which works like a vacuum pump when heated in the interior, for example, an oxide compound such as titanium or zirconium that adsorbs gas) The vacuum state is maintained. In this case, in order to improve the performance of vacuum insulation, it is necessary to confirm a high vacuum state at the sealing stage. Even in this embodiment, a getter is used, but from the actual situation that the amount of gas adsorbed by the getter is limited, in this embodiment, a high vacuum state at the sealing stage is confirmed, and the heat insulation performance / quality is confirmed. We are trying to confirm the improvement.

  The fourth is to make it possible to maintain the performance of the vacuum double container in a high-temperature environment. For this purpose, a sealing tool that can be used even when the melting temperature of the brazing filler metal is as high as possible. It was a study of a sealing port that does not distort at high temperatures during brazing. As is well known, 18-8 stainless steel is very difficult to correct to its original state once strain due to heat has occurred. In this embodiment, one of the reasons that the sealing port of the vacuum double container has an uneven structure is that the periphery of the sealing port is properly cooled with water by a brazing exhaust tool so that no distortion occurs. Because. The second reason is to prevent thermal damage to the brazing exhaust tool and the sealing O-ring (fluorinated rubber) that maintains the vacuum of the vacuum double container. Therefore, the sealing port of the brazing exhaust tool and the vacuum double container is inlay.

  For the brazing exhaust tool, select the brazing material that melts at a low temperature because the seal packing of the vacuum structure exhaust device described in JP-A-10-295561 cannot withstand high temperatures. In the brazed exhaust tool of the present embodiment, it is necessary to reduce the temperature of the tool by water cooling, and the shape along the incident angle of light (see FIG. 16). The solution is to be able to use brazing material that melts at high temperatures. As a result, the vacuum double container according to the present embodiment can keep the internal temperature without melting the brazing material being sealed, if the use environment is below the predetermined temperature. In this regard, it may be useful to protect devices installed in high temperature environments from high temperatures in the future.

  The brazing exhaust tool according to the present embodiment has a structure in which the water-cooled portion is in contact with the outer plate of the double container, and a brazing material that melts at a high temperature can be used while minimizing distortion due to heat.

  The fifth was to prevent the sealing port of the vacuum double container from protruding outward. Since the sealing port is located on the bottom surface of the vacuum double container, if it protrudes, a thing like a cover covering the entire bottom surface becomes necessary. This is because the protruding portion becomes like a leg of a frame or a leg of a heroine, and the vacuum double container cannot be stably placed. As in the present embodiment, by using a hollow screw for the baking exhaust tool (gas injection and exhaust tool), if the screw can be made in the sealing port, it can be easily evacuated. However, at that time, the upper end of the sealing port must be more concave than the bottom surface. In the present embodiment, the screw portion is convex outward, but of course, it can be convex inward.

  The inventor further claims the following points. In the present embodiment, brazing is adopted as means for sealing the vacuum double container. Brazing is advantageous for sealing the vacuum double container. As a method for sealing the vacuum double container, in addition to brazing, sealing by welding or gasket is conceivable. In welding, the structure of the sealing port is important, but the cost is low and it can be used for mass production. It can be said that it is optimal for sealing in a vacuum furnace. However, a large amount of capital investment is required. On the other hand, sealing with a gasket is low in cost, but it can be said that vacuum leaks occur frequently and lacks reliability. For example, it is often used in measuring instruments used in laboratories and the like, and there is a situation that it is necessary to evacuate again once in several years. In this regard, the structure of the sealing port is important for sealing by brazing, but the cost is low, it can be used for mass production, and it is optimal for sealing outside the vacuum furnace, but the cost does not increase.

101 Gas injection and exhaust tool 102 Gas injection jig (gas injection part)
103 Connector jig (connector part)
104 Movable jig (operation part)
105 1st gasket 106 2nd gasket 112 Sealing member (prevention part)
115 Attached part 116 Gas flow path 119 Female thread part 123 Male thread part 128 Bolt shaft (male thread part for connection)
131 Ventilation path 151 Vacuum double container 152 Outer bottle 153 Inner bottle 154 Internal space 155 Recess 156 Port 157 Female thread part 301 Brazing exhaust tool 307 O-ring for sealing (seal part)
308 Glass body (translucent part)
313 Tapered hole (communication path)
314 Cylindrical hole (communication path)
317 Suction channel 319 Flowing groove

Claims (2)

The outer bottle and the inner bottle comprise a concave portion provided on the outer bottle and recessed toward the inner bottle, a first portion protruding from the concave portion in a direction away from the inner bottle, and a first portion protruding from the concave portion in a direction approaching the inner bottle. A brazing exhaust tool used for a vacuum double container having a port having at least one of two parts and a female screw part formed on an inner peripheral surface of the port,
A suction path for suction by a vacuum pump;
A communication path connecting the suction path and the port;
A seal portion for preventing leakage when communicating between the communication path and the port;
A part of the outer wall of the connecting path, and a light transmitting part that transmits light for melting the brazing material disposed in the connecting path;
A brazed exhaust tool. A running water groove is formed around the communication path,
The brazed exhaust tool according to claim 1.

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