JPH0319772B2 - - Google Patents

Description

[Detailed Description of the Invention] Recently, stainless steel pots, water bottles, etc., which are strong and durable to use, have been on the market.

The present invention is based on the metal used (stainless steel).
The present invention relates to a method for manufacturing a vacuum heat-insulating container. The conventional manufacturing method involves punching an exhaust hole in a part of the hollow container body consisting of a metal outer container and a metal inner container, placing a wax material between the exhaust hole and the lid, and then vacuuming the hole. In a heating furnace, heat treatment is performed under vacuum to simultaneously perform a vacuum evacuation process and a lid brazing process.

However, with this manufacturing method, good brazing is achieved when the wax flows uniformly around the lid.
In reality, it is not a 100% manufacturing method as there may be gaps, so the current situation is the same. The present invention is a method for manufacturing a metal vacuum heat-insulating container that can be manufactured in a state close to 100%, and the manufacturing process will be detailed as follows with reference to the accompanying drawings.

A hollow container body a is formed by a metal outer container 1 made of stainless steel or the like and a metal inner container 2 by a conventional method. An exhaust pipe 3 that thermally expands when heated is provided at a suitable location on the metal outer container 1.

The exhaust pipe 3 in the drawings shows a nut having a tapered female thread, and is provided at the bottom of the metal outer container 1. This hollow container body a is placed in a vacuum heating furnace,
The exhaust pipe 3 is heated under vacuum to perform vacuum evacuation from the exhaust pipe 3, and at the same time, the exhaust pipe 3 is thermally expanded to form the exhaust pipe 3.
After fitting the stopper lid 4 into the exhaust pipe 3, the exhaust pipe 3 is cooled, and the stopper cover 4 is fitted and fixed into the exhaust pipe 3 to produce a hollow container body a in a predetermined vacuum state.

It is preferable to form a male thread on the outside of the stopper lid 4 to match the female thread of the exhaust pipe 3. (The exhaust pipe 3 and the plug lid 4 are not screwed together, but one or several grooves are formed inside the exhaust pipe 3, and a protrusion that fits into the grooves is formed on the outside of the plug lid 4.) Furthermore, in this case, complete sealing will be achieved by interposing an adhesive between the exhaust pipe 3 and the stopper lid 4. (If the stopper lid 4 is struck and deformed, a more complete seal can be achieved.) Since the present invention is configured as described above, the hollow container body a
When placed in a vacuum heating furnace and subjected to heat treatment under vacuum, the air between the metal outer container 1 and the metal inner container 2 is removed by the exhaust pipe 3, creating a vacuum state, and the exhaust pipe 3 simultaneously expands thermally. Therefore, at this time, exhaust pipe 3
Fit the stopper lid 4 inside.

Since it is inside a vacuum heating furnace, it is preferable to fit the stopper lid 4 into the exhaust pipe 3 using a robot, an automatic feeder, or the like. After the plug cover 4 is fitted, when the exhaust pipe 3 is cooled (quick cooling or natural cooling), the exhaust pipe 3 returns to its original state, so the plug cover 4 is fitted into the exhaust pipe 3, so the exhaust hole of the exhaust pipe 3 is closed. will be completely closed, resulting in a completed product of hollow container body a.

The exhaust pipe 3 and the lid 4 are preferably made of stainless steel, similar to the metal outer container 1 and the metal inner container 2, and the size of the plug lid 4 should also be determined by considering the material and expansion rate of the exhaust pipe 3. .

As described above, the present invention simply evacuates the air inside the hollow container body a to create a vacuum, and also makes use of the thermal expansion of the exhaust pipe for sealing to tightly fit the stopper lid into the exhaust pipe. Therefore, highly accurate sealing can be performed.

At this time, by providing a female thread on the inside of the exhaust pipe and a male thread on the outside of the stopper lid, it has excellent features such as preventing the stopper lid from coming off and creating a more reliable seal.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of the stopper lid before it is closed, and FIG. 2 is a front sectional view showing the vacuum state after the stopper lid is closed. a...Hollow container body, 1...Metal outer container, 2...
...Metal inner container, 3...Exhaust pipe, 4...Bung lid.

Claims (1)

[Claims] 1. A hollow container body is formed by a conventional method using a metal outer container such as stainless steel and a metal inner container, and an exhaust pipe that thermally expands when heated is provided at an appropriate location on the metal outer container, and this hollow container is The body is heat-treated under vacuum in a vacuum heating furnace, the exhaust pipe is evacuated, and at the same time the exhaust pipe is thermally expanded and a plug lid is fitted into the exhaust pipe.The exhaust pipe is then cooled and the plug is removed. A method for manufacturing a metal vacuum heat-insulating container, which comprises manufacturing a hollow container body in a predetermined vacuum state by fitting and fixing a lid into an exhaust pipe.