JPH1014786A - Vacuum hermetic sealing method for vacuum double vessel and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To expand the volume of a double vessel and to simplify a stage for molding the base of the double vessel by interposing a hermetic sealing device adapted to hermetically seal the discharge hole of the double vessel by placing a ceramic brazing filler metal for hermetically sealing the discharge hole on this device. SOLUTION: The base 140 of the outside vessel 120 of the double vessel including a vacuum part 130 includes a recessed part 142 bored with the discharge hole 141 in the suitable position thereof. This recessed part is hermetically sealed by the ceramic brazing filler metal 300. After the vacuum discharge of the vacuum part 130, the hermetic sealing device is rested on the base 140 of the double vessel and the ceramic brazing filler metal 300 is placed on the arrangement port of the hermetic sealing device. When the temp. of a vacuum heating furnace rises to a prescribed heating temp. in such a state, the ceramic brazing filler metal 300 placed on the arrangement port of the hermetic sealing device is thermalized. Gases are generated from the thermalized ceramic brazing filler metal 300 and a high vacuum degree is obtd. The thermalized ceramic brazing filler metal 300 drops into the recessed part 142 via the outflow hole of the arrangement hole and hermetically seals the discharge hole 141.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the sealing of a vacuum double container for keeping all liquid contents, such as cold and hot water, warm and stored. More specifically, the present invention relates to a double container constituting a vacuum double container. The present invention relates to a method and an apparatus for vacuum-sealing a vacuum double container in which the degree of vacuum is increased to enhance the heat-retaining storability, thereby improving the quality and the satisfaction of consumers.

[0002]

2. Description of the Related Art In general, a thermos keeps liquid contents warm.
The most common type of storage container used for storage is such a vacuum double container, which removes air in a vacuum section consisting of a double container consisting of an inner container and an outer container to remove air. To form a vacuum double container.

The most important problem in such a vacuum double container is the degree of vacuum maintenance of the vacuum heat insulating layer forming the double container. Various methods of manufacturing a vacuum double container configured in this way have been developed and utilized so far, but such a method of manufacturing a vacuum double container generally involves joining an inner container and an outer container. A double container is formed, and an exhaust port is provided at an appropriate position on the bottom surface of the inner container, the outer container, and the inner container. The air in the space between the inner container and the outer container is evacuated in a vacuum heating furnace in a vacuum heating furnace. It produces a vacuum double container by evacuating it.

More specifically, the double container having undergone the joining process of the inner and outer containers is bonded to the peripheral wall of the double container in a multi-step process in a vacuum heating furnace at an appropriate heating temperature. The oils or foreign substances are incinerated by heating, and at the same time, the space in the double container becomes a vacuum.

At this time, after evacuating in a vacuum heating furnace, the exhaust port provided on the bottom surface of the outer container of the double container is necessarily sealed. Vacuum maintenance, which directly affects the heat insulation of the vacuum double container, has an effect on product properties, and occupies a very important part in the vacuum double container.

[0006] A lot of research and development have been made on such a method of sealing an exhaust port in order to reduce the production cost of a thermos bottle in recent years and improve the degree of vacuum. One example is Japanese Patent Application Publication No. 169850/1994. Such a method for manufacturing a vacuum double container has an exhaust port on the bottom surface of a double container formed by joining an inner container and an outer container so as to provide an appropriate space and to provide a space between the inner container and the outer container. After the solid brazing material that can be welded at a low temperature is arranged, the brazing material is heated in a vacuum heating furnace to evacuate the space, and the brazing material is melted to seal the exhaust port.

[0007] However, when the brazing material for sealing the exhaust port of the vacuum double container is melted (vapor pressure) by such a sealing method, a chemical action occurs from the composition of the brazing material, and inevitably from the joining material. Gas is generated, and the gas generation causes an enormous phenomenon of the brazing material, and the enormous phenomenon reduces the density due to relaxation of the particle structure of the brazing material, and in severe cases, loses the airtightness of the sealed part and causes disposal. There was a problem that the defective rate increased.

Further, in the process of heating the brazing material, the gas is released and the vacuum welding is performed in a state where the exhaust port is closed due to the occurrence of the boiling phenomenon, so that the residual gas in the vacuum portion cannot be completely released and the vacuum portion is sealed. However, there is a problem that the seal is broken even by a small impact due to remaining air bubbles and the vacuum is broken.

In addition, since the exhaust port and the brazing material are close to each other, when the brazing material is heated, harmful gases such as organic substances, impurities, and binder mixed therein flow into the vacuum part, and the heat insulating effect is reduced. there were.

In addition, since such a sealing method is a low-temperature welding method, there is an effect of reducing the cost of power consumption. However, since the vacuum is formed in a state where the degree of vacuum of the vacuum double container is low, the degree of vacuum is low. There is a problem that the heat insulating effect of the thermos is reduced depending on the point, and thus the product quality is also reduced.

In view of the above problems, the present inventor has recently developed a vacuum section so as to maintain the highest possible degree of vacuum, reduce power consumption, reduce manufacturing costs and improve commercial value. Pressing the periphery of the exhaust hole provided at an appropriate place on the bottom surface of the outer container of the double container having an appropriate width to an appropriate width to form a blank slightly lowered from the surface of the heat insulating peripheral wall, An aluminum or silicon-based ceramic sealing member which is slightly smaller than the volume of the above is put in, fired at a temperature of about 450 to 900 ° C. in a final stage vacuum furnace, baked on a blank substrate, and the exhaust hole is sealed.

With this configuration, power consumption can be reduced.
A method and a structure for sealing a thermos for improving heat retention by increasing the degree of vacuum have been filed in Korean Patent Application No. 4988 (1994). In addition to the closeness of the brazing material, the center of the bottom surface of the outer container of the double container having a vacuum part is designed to increase the degree of vacuum of the double container, improve the heat insulation effect, improve the heat insulation, and enhance the product quality. In the vacuum heating furnace, the ceramic brazing material is first heat-treated at a suitable primary heating temperature in a vacuum heating furnace. After melting, heating is performed at a secondary heating temperature higher than the thermalization temperature of the ceramic brazing material, and the gas is discharged from the brazing material through the evacuated space provided between the inner and outer vessels. A vacuum sealing method for a vacuum double container with a sufficiently high degree of vacuum and a high degree of heat retention and merchantability by sufficiently sealing and exhausting the brazing material in a molten state that has been sufficiently stabilized and flows into the arrangement port, and the same. The sealing structure was applied to the Korean patent application (19 4 years 35
No. 580).

However, in the manufacturing process, the bottom of the outer container of the double container forming the space is raised inward so that the volume of the thermos becomes small and the molding process is troublesome. It must be molded, a special shape of ceramic brazing material is required, and a special structure must be formed on the bottom surface of the outer container of the double container that forms the vacuum part. It has been discovered that simpler manufacturing processes and equipment should be improved in order to improve.

[0014]

SUMMARY OF THE INVENTION The present invention has been devised in order to solve the above-mentioned various problems, and a ceramic brazing material for sealing an exhaust hole of a vacuum double container is loaded thereon to form an exhaust hole. The capacity of the double container can be expanded by interposing a sealing device that is hermetically sealed, the forming process of the bottom surface of the double container is simple, and the welding process of the ceramic brazing material is unified, so that the manufacturing process and SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for vacuum sealing a double vacuum container, which is capable of improving productivity, and at the same time, having an excellent heat insulating effect, improving heat insulation and improving product quality.

In order to achieve the above-mentioned object, the present invention joins a metal inner and outer container to form a double container having a vacuum portion, and places a vacuum portion at an appropriate position of the double container. In the vacuum sealing method of a vacuum double container in which an exhaust hole is sealed with a ceramic brazing material in a vacuum heating furnace for vacuum evacuation,
At a suitable position on the bottom surface of the inner and outer containers, a sealing device having a recess having an exhaust hole for vacuum exhaust and a position higher than this position and having an exhaust port, an outlet hole, and an arrangement port is secured. After the ceramic brazing material is placed on the opening of the sealing device, the ceramic brazing material is evacuated and evacuated in the vacuum heating furnace at the primary heating temperature and the gas is discharged. At the same time as evacuating to the vacuum part of the double container,
The ceramic brazing material placed in the arrangement opening of the sealing device is dropped in a sufficiently stable thermal state, and the exhaust hole of the outer container is sealed.

Further, according to the present invention, a bottom surface having an exhaust hole for evacuation at an appropriate position on the bottom surface of the inner and outer containers, and the placed ceramic brazing material in a sufficiently stable thermalized state. An exhaust hole for a brazing material to be dropped and an arrangement port, and an exhaust port for vacuum are provided, and the exhaust hole of the double container is sealed with a sealing device which is settled so as to form a gap with the bottom surface. I do.

Further, the present invention forms a double container having a vacuum portion by joining inner and outer containers made of metal including stainless steel, and forms an exhaust hole at a proper position of the double container. In a sealing device for a vacuum double container in which an exhaust hole is sealed with a ceramic brazing material, a distance is set from a bottom surface where a recessed portion of an exhaust hole is formed at an appropriate position of the double container, and a seat is set at an upper position. Alternatively, a separate sealing device having an outflow hole, an arrangement port, and an exhaust port can be settled, and the ceramic brazing material placed in the arrangement port of the sealing device falls in a sufficiently stable thermalized state. And sealing the exhaust hole of the double container.

Further, the present invention is characterized in that the exhaust hole of the bottom surface and the outlet hole of the sealing device are located on the same axis.

Further, the present invention is characterized in that the exhaust hole on the bottom surface and the outlet hole of the sealing device are located on an eccentric coaxial line.

Further, the present invention is characterized in that the exhaust hole is provided with an annular jaw projecting upward.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partial cross-sectional view of a vacuum double container sealed according to the present invention. Such a vacuum double container comprises a vacuum double container 100. The inner container 110 and the outer container 120 are joined so that an appropriate space is provided therebetween and the vacuum unit 130 is maintained.

FIG. 2 shows the vacuum part 1 of the double container 100 of the present invention.
The sealing structure for maintaining the vacuum state of the vacuum container 30 is shown in detail, that is, the double container 1 having the vacuum unit 130.
At a suitable position (approximately at the center) of the bottom surface 140 of the outer container 120 of FIG. 00, a concave portion 142 having an exhaust hole 141 is provided, sealed with a ceramic brazing material 300, and vacuum-sealed with a high degree of vacuum. A method and an apparatus therefor.

According to the present invention, as described above, a suitable position (approximately at the center) of the bottom surface 140 of the outer container 120 of the double container 100.
A sealing method and a sealing device for interposing and sealing a sealing device 200 shown in FIG. 4 in forming a recessed portion 142 in which an exhaust hole 141 is formed and sealing with a welded ceramic brazing material 300 are provided. .

According to the present invention, as shown in FIG. 2, the volume of the inner container 110 can be expanded to the maximum by making the bottom surface 111 of the inner container 110 constituting the double container 100 smooth. Also make the bottom surface 140 smooth and the bottom surface 140
This facilitates molding.

In the present invention, the sealing device 200 used in the vacuum sealing method has a circular plate shape similar to the bottom surface 140 of the double container 100 as shown in FIG. The wall 210 is configured so as to maintain the interval when the seating is performed, and such a sealing device 20 is used.
An eccentric portion 230 is formed at an eccentric portion which escapes from the center portion of the hole 0, and a ceramic brazing material 300 as a sealing member is arranged. The ceramic brazing material is melted and drops through the outflow hole 220. To do. That is, when the sealing device 200 is placed on the bottom surface 140 of the outer container 120,
Exhaust hole 141 of bottom surface 140 and outlet hole 2 of sealing device 200
20 are formed at positions where they do not coincide with each other, and a number of exhaust ports 240 are formed around this.

On the other hand, the ceramic brazing material 300 used as a sealing member for maintaining a vacuum in the present invention is manufactured by sintering a ceramic of a cellulan or tarl compound or a ceramic of an aluminum or silicon. Such a ceramic brazing material is added with a glaze so as to have a predetermined form through an appropriate pressing process, and after being fired into the ceramic brazing material, peels off from the exhaust hole on the bottom surface of the double container of the thermos. It is preferable to approximate the coefficient of thermal expansion of the glaze and the coefficient of linear expansion of the base material (stainless steel) at the time of baking so as not to cause peeling or cracking so as not to cause cracking or cracking.

FIG. 3 is an explanatory view of a manufacturing process illustrating an embodiment of the present invention. The present invention will be described below in detail.

First, in the present invention, while passing through the double container through the first, second and third stages of the electrothermal vacuum heating furnace, oils and foreign substances adhering around the double container are removed. A heat treatment process of incinerating and evacuating organic matter is performed. Such a heat treatment process is the same as the existing method.

In the present invention, as described above, after passing through the vacuum heating furnace in several stages, the vacuum part of the double vessel is evacuated on the vacuum furnace in the final stage, and the evacuation hole is hermetically sealed. As shown in FIG. 3A, the sealing device 200 is seated on the bottom surface 140 of the double container 100, and the sealing device 200 is placed on the placement port 230 of the sealing device 200 thus seated. It is explanatory drawing of the state before the placed ceramic brazing material 300 is heated. When the vacuum heating furnace rises and falls to a predetermined heating temperature in such a state, the ceramic brazing material 300 placed in the arrangement port 230 of the sealing device 200 is heated and starts melting.

At this time, the ceramic brazing material 300 is vacuum-heated in a state where the thermalization state is advanced on the arrangement port 230 in the sealing device 200 at a position higher than the position of the vacuum exhaust hole 141 on the bottom surface 140 of the outer container. When the temperature of the furnace is gradually increased to a secondary heating temperature, and when the vacuum heating furnace is heated to a vapor pressure or more, gas is generated in the ceramic brazing material 300 that has been heated, and in such a state, a vacuum evacuation process is performed. To obtain the highest possible degree of vacuum.

After the vacuum heating furnace is maintained at the secondary heating temperature and a predetermined time has elapsed, the ceramic brazing material 300
The gas discharge and swelling phenomenon are eliminated. Then, the ceramic brazing material 300 of the pure component in the heated and gelled state is spontaneously formed in the concave portion 142 formed on the bottom surface 140 of the outer container 120 through the outlet hole of the arrangement port 230 of the sealing device 200. As shown in FIG. 3B, the air vent 141 is formed on the bottom surface 140 of the outer container 120 and the sealing device 22 is placed on the bottom surface 140.
The outflow hole 220 of the outer container 120 is formed at a position on the mutual eccentric line avoiding the concentric circle.
This seals the exhaust hole 141 formed at zero.

Further, the present invention is a sealing method by indirect melting, in which the ceramic brazing material 300 is completely released in the process of heating the ceramic brazing material 300 in the sealing device 200, and the ceramic brazing material 300 is sufficiently stabilized. By sealing the exhaust hole 141, a sufficient vacuum time can be ensured, and the quality can be improved by high-quality sealing.

As described above, after the vacuum sealing process is performed and the ceramic brazing material 300 is hardened and the vacuuming process of the double container is completed, the sealing device 200 may be removed, and the removed sealing device continues. It can be reused.

FIG. 5 shows another first embodiment of the present invention. The sealing device 200 of the present invention has a circular plate shape similar to the bottom surface 140 of the double container 100,
The wall 210 is configured so as to maintain the interval when the seal is placed at zero, and the outlet hole 2 is formed at the center of such a sealing device 200.
The ceramic brazing material 300 as a sealing member is disposed by forming 20 perforated arrangement ports 230 so that the ceramic brazing material is melted and dropped through the outflow holes 220. That is, when the sealing device 200 is placed on the bottom surface 140 of the outer container 120, the exhaust hole 141 of the bottom surface 140 and the outlet hole 220 of the sealing device 200 are positioned on the same axis, and a large number of A mouth 240 is formed.

FIG. 6 shows a second embodiment of the present invention. The sealing device 200 of the present invention has a circular plate shape similar to the bottom surface 140 of the double container 100, and has a bottom surface 140 of the double container 100. Wall 21 so that the gap is maintained
The sealing device 200 is provided with an arrangement hole 230 in which the outflow hole 220 is formed at the center of the sealing device 200, and the ceramic brazing material 300 as a sealing member is arranged. To fall through. That is, the sealing device 2 is provided on the bottom surface 140 of the outer container 120.
When 00 is laid, the exhaust holes 141 of the bottom surface 140 and the outflow holes 220 of the sealing device 200 are positioned on the same axis, and a number of exhaust ports 240 are formed around this.

The exhaust hole 141 of the bottom surface 140 has an annular jaw 141a projecting upward.

FIG. 7 shows a third embodiment of the present invention. The sealing device 200 of the present invention has a circular plate shape similar to the bottom surface 140 of the double container 100, and the bottom surface 140 of the double container 100. Wall 21 so that the gap is maintained
The sealing device 200 is provided with an arrangement hole 230 in which the outflow hole 220 is formed at the center of the sealing device 200, and the ceramic brazing material 300 as a sealing member is arranged. To fall through. That is, the sealing device 2 is provided on the bottom surface 140 of the outer container 120.
In order to place 00, the exhaust hole 141 of the bottom surface 140 and the outlet hole 220 of the sealing device 200 are positioned on an eccentric coaxial line, and a plurality of exhaust ports 240 are formed around this.

The exhaust hole 141 of the bottom surface 140 has an annular jaw 141a projecting upward.

FIG. 8 shows a fourth embodiment of the present invention. The sealing device 200 of the present invention has a circular plate shape similar to the bottom surface 140 of the double container 100, Wall 21 so that the gap is maintained
The sealing device 200 is provided with an arrangement hole 230 formed with an outflow hole 220 in the center of the sealing device 200, and the ceramic brazing material 300 as a sealing member is arranged. Drop through 220. In addition, the concave portion 142 formed on the bottom surface 140 of the double container 100 forms a reinforcing circular protrusion 142a concentric with the exhaust hole 141 so that the exhaust hole 141 is located on the same plane as the bottom surface. I do. By forming the reinforcing circular protrusion 142a in the exhaust hole 141, the ceramic brazing material 300 due to the impact during use of the double container 100 is formed.
This is to prevent the destruction.

FIG. 9 shows a fifth embodiment of the present invention, in which the sealing device 200 of the present invention has a circular plate shape similar to the bottom surface 140 of the double container 100, and the bottom surface 140 of the double container 100. Wall 21 so that the gap is maintained
The sealing device 200 is formed with an arrangement port 230 in which the outflow hole 220 is formed at the center of the sealing device 200, and the ceramic brazing material 300 as a sealing member is arranged. Drop through 220. A concave portion 142 formed in the bottom surface 140 of the double container 100 is formed by spot welding a reinforcing circular washer 142b concentrically with the exhaust hole 141 so as to form the exhaust hole 14.
1 is located on the same plane as the bottom surface. By forming a reinforcing circular washer 142b in the exhaust hole 141, it is possible to prevent the ceramic brazing material 300 from being broken by an impact during use of the double container 100.

[0042]

As described above, the present invention not only has the effect of expanding the volume of a thermos bottle to the maximum by interposing the sealing device in the vacuum sealing process, but also has a high degree of vacuum and excellent heat retention, as well as storability. It also has the effect of increasing the merchantability of the thermos. As described above, one embodiment of the present invention has been described, but the present invention is not limited to this, and can be modified within the scope described in the claims.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a vacuum double container sealed according to the present invention.

FIG. 2 is an enlarged sectional view of a sealing structure of the thermos bottle of FIG. 1;

FIGS. 3A and 3B are explanatory views of a vacuum sealing step of the present invention.

FIG. 4 is a perspective view of the sealing device of the present invention.

FIG. 5 is an enlarged sectional view of the first embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a second embodiment of the present invention.

FIG. 7 is an enlarged sectional view of a third embodiment of the present invention.

FIG. 8 is an enlarged sectional view of a fourth embodiment of the present invention.

FIG. 9 is an enlarged sectional view of a fifth embodiment of the present invention.

[Explanation of symbols]

 100 double container 110 inner container 111 bottom of inner container 120・ ・ ・ Outer container 130 ・ ・ ・ ・ Vacuum part 140 ・ ・ ・ ・ Bottom 141 ・ ・ ・ ・ ・ ・···· Exhaust hole 142 ··· Recess 200 ··· Sealing device 210 ··· Wall Body 220: Outlet 230: Arrangement 240: Exhaust 300:・ ・ ・ ・ ・ ・ ・ ・ ・ Ceramic brazing filler metal

Claims (10)

[Claims] 1. A double container 100 having a vacuum portion 130 is formed by joining inner and outer containers 110 and 120 made of metal.
An exhaust hole 141 for evacuation of the vacuum section is placed in an appropriate position of the double vessel in a vacuum heating furnace.
In a vacuum sealing method for a vacuum double container sealed by a vacuum valve, a concave portion having an exhaust hole for evacuation is formed at an appropriate position on the bottom surface 140 of the inner and outer containers 110 and 120. After the sealing device 200 having a high position and an exhaust port, an outflow hole, and an arrangement port is settled, vacuum evacuation is performed in a vacuum heating furnace with the ceramic brazing material 300 placed on the arrangement port of the sealing apparatus. At the primary heating temperature, the ceramic brazing material is heated and gas is discharged, and at the secondary heating temperature, the vacuum portion 130 of the double vessel is evacuated, and at the same time, the ceramic brazing material placed at the opening of the sealing device is removed. A vacuum sealing method for a vacuum double container, characterized in that the container is dropped in a sufficiently stabilized thermal state to seal an exhaust hole of an outer container. 2. A bottom surface 140 having an exhaust hole for evacuation at an appropriate position on the bottom surface of the outer container, and an outlet hole and an arrangement hole for a brazing material for dropping the placed ceramic brazing material in a heated state. The exhaust hole 141 of the double container is sealed with a sealing device 200 having a vacuum outlet and a vacuum outlet, and being seated so as to be spaced from the bottom surface. The method for vacuum sealing a vacuum double container according to the above item. 3. A concave portion 142 formed on the bottom surface 140 of the double container 100 forms a reinforcing circular protrusion 142a concentric with the exhaust hole 141, and the exhaust hole 141 is located on the same plane as the bottom surface. The method for vacuum sealing a vacuum double container according to claim 1, characterized in that it is configured as described above. 4. A recess 142 formed in the bottom surface 140 of the double container 100 is formed by spot welding a reinforcing circular washer 142b on a concentric circle with the exhaust hole 141.
2. The vacuum sealing method for a vacuum double container according to claim 1, wherein 1 is located on the same plane as the bottom surface. 5. An inner and outer container 1 made of metal containing stainless steel.
10 and 120 are joined to form a double container 100 having a vacuum portion 130, and an exhaust hole 1 is provided at an appropriate position in the double container.
41. A vacuum double-vessel sealing device for sealing an exhaust hole with a ceramic brazing material in a perforated concave portion 142 of a 41, a bottom surface 140 forming a perforated concave portion of an exhaust hole at an appropriate position of the double container. A ceramic brazing material which can be settled or detached at an upper position at a distance and which has a separate sealing device 200 having an outflow hole 220 and an arrangement port and an exhaust port is seated, and is placed in the arrangement port of the sealing apparatus. A sealing device for a vacuum double container, wherein 300 is dropped in a heated state to seal an exhaust hole of the double container. 6. The exhaust hole 141 in the bottom surface and the sealing device 20.
The sealing device for a vacuum double container according to claim 5, wherein the zero outlet holes 220 are located on the same axis. 7. The exhaust hole 141 on the bottom surface and the sealing device 20.
The sealing device for a vacuum double container according to claim 5, wherein the zero outlet hole 220 is located on an eccentric coaxial line. 8. The vacuum double container according to claim 5, wherein said exhaust hole 141 is provided with an annular jaw 141a projecting upward. Sealing device. 9. A recess 142 formed in the bottom surface 140 of the double container 100 forms a reinforcing circular protrusion 142a concentric with the exhaust hole 141, and the exhaust hole 141 is located on the same plane as the bottom surface. 6. The sealing device for a vacuum double container according to claim 5, wherein the sealing device is configured as described above. 10. A recess 142 formed in the bottom surface 140 of the double container 100 is formed by spot welding a reinforcing circular washer 142b on a concentric circle with the exhaust hole 141.
6. The sealing device for a vacuum double container according to claim 5, wherein the structure is such that 41 is located on the same plane as the bottom surface.