JPS6127640B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the manufacture of vacuum double containers.

For example, in the case of a stainless steel vacuum duplexer, conventionally, before creating a vacuum, a pipe for vacuum suction is connected to a part of the duplex vessel, and the air inside the duplex vessel is exhausted through this pipe. After reaching the vacuum level of
The pipe was mechanically crushed and sealed.
However, since the pipe protrudes from the double container, it would be difficult to store it in a separate container, creating a somewhat inconvenient presence.

This invention was made in order to solve the above-mentioned inconvenience. Before manufacturing the double container, a micro hole is drilled in advance, and the micro hole is used as a vacuum suction hole to evacuate the inside of the double container, and after the vacuum is completed, , the micropores are irradiated with laser light to obtain a vacuum double container without protrusions.

The present invention will be described below based on drawings showing embodiments.

FIG. 1 shows the process of manufacturing a hollow double container 1. That is, in this step, a bottomed cylindrical inner body 3 having a flange portion 2 formed at its opening and a bottomed cylindrical outer body 4 having an outer diameter matching the periphery of the flange portion 2 are combined. Ru. The joint portion is a mating surface 5 between the lower peripheral edge of the flange portion 2 and the opening end surface of the outer body 4, and the laser beam 7 focused by the condensing lens 6 is irradiated onto this mating surface in an annular manner to form the inner body 3. and outer body 4
and are sealed together. Both the inner body 3 and the outer body 4 are made of stainless steel, and their bottoms are both formed into spherical parts that are convex to the outside.
At approximately the center of the bottom of one of the outer bodies 4, a minute hole 8 having a diameter smaller than the plate thickness of the outer body 4 is bored by punching, drilling, laser drilling, etc. before or after the sealing connection. It is set up.

FIG. 2 shows the step of evacuating the hollow portion 9 of the double container 1 and the step of sealing the hole 8. To accomplish these two steps, the following exhaust tool 10 is applied. This exhaust tool 10 has a hollow body 11, one end of which is an opening, the end surface of which is formed into a concave spherical surface along the bottom outer surface of the outer body 4, and a gasket 12 is fixed thereto. Furthermore, a window 13 is airtightly provided at the other end of the hollow body 11 using a transparent material such as quartz. Furthermore, an exhaust pipe 14 communicating with the interior of the hollow body 11 is airtightly connected to the side of the hollow body 11 . In the exhaust tool 10 configured as described above, the exhaust pipe 14 is connected to a known vacuum pump 15, and on the other hand, a condensing lens 16,
Laser oscillators 17 are sequentially arranged.

Next, the steps of vacuuming and sealing the double container 1 will be explained with reference to FIG. One end of the hollow body 11, which becomes the opening, is pressed relatively against the bottom outer surface of the outer body 4 via the gasket 12. Next, the vacuum pump 14
is activated to expel the air in the hollow part 9 of the double container 1 through the hole 8. After creating a predetermined degree of vacuum in the hollow portion 9, a laser beam 18 is output from the laser oscillator 17. The laser beam 18 passes through the condensing lens 16 and the window 13 and is irradiated around the hole 8, and the hole 8 is closed by melting the surrounding area.

As detailed above, this invention creates a vacuum inside the double container through the micro holes drilled in the double container,
Since the microholes are welded and sealed using laser light, the conventional process of sealing and cutting is no longer required, and the work process can be shortened. Furthermore, since the protrusions can be eliminated, various conventional problems caused by the protrusions are resolved.

In the above embodiment, the hole 8 was previously drilled before the inner body 3 and the outer body 4 were combined to form the double container 1, but when the exhaust tool 10 was brought into close contact with the outer body 6, the condenser lens The hole 8 may be bored by the laser beam 18 by adjusting the position of the hole 16 .

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the manufacturing process of a double container according to the present invention, and FIG. 2 is a sectional view showing the process of converting the double container into a vacuum double container. 1...Double container, 3...Inner body, 4...Outer body, 8
... Hole, 10 ... Exhaust tool, 11 ... Hollow body, 12
...Gasket, 13...Window, 14...Exhaust pipe,
16...Condensing lens, 17...Laser oscillator, 1
8...Laser light.

Claims (1)

[Scope of Claims] 1. A step of making micropores in either the inner body or the outer body combined with the inner body, a step of combining the two to form a double container, and an airtight transparent structure. an evacuation step to bring the inside of the double container to a predetermined degree of vacuum by bringing the distal end surface of an evacuation tool having a light window into close contact with the periphery of the microhole; A method for manufacturing a vacuum double container, comprising a laser beam irradiation step for sealing micropores. 2. In the method for manufacturing a vacuum double container as set forth in claim 1, the step of forming microholes involves irradiation of laser light that passes through a transparent window and is guided into an exhaust tool that is in close contact with the outer body. A method for manufacturing a vacuum double container, characterized in that the method is performed by: