JPS58124415A - Production of metal magic pot - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention relates to a method for manufacturing a metal thermos flask, which enables a metal thermos flask with improved heat insulation performance to be obtained through a process that is almost the same as the conventional method. Conventionally, in metal thermos flasks consisting of an inner cylinder and an outer cylinder, with a vacuum insulation layer between the inner and outer cylinders, a shield is placed within the vacuum insulation layer to prevent heat loss or heat intrusion due to radiation between the inner and outer cylinders. Methods of reducing radiation and heat transfer by interposing a plate, filling a vacuum heat insulating layer made of powder such as partite, or stacking vapor-deposited arseum in multiple layers within a vacuum heat insulating layer are well known. However, according to such conventional methods, several manufacturing processes are performed separately, making the work complicated, and the cost of manufacturing increases due to high material costs. This invention was made in view of the above circumstances, and its purpose is to provide a method for manufacturing a metal thermos flask that is low in manufacturing cost, easy to manufacture, and has high heat insulation performance. Insulation layer middle surface FIR (inner fit 1i
) coated with a dissimilar metal with low emissivity such as steel,
By heating the metal thermos bottle shell consisting of the inner and outer cylinders under vacuum, the joints of the shells are brazed to form a vacuum insulation layer between the inner and outer cylinders, and at the same time, the dissimilar metals are firmly attached to the inner surfaces of the inner and outer cylinders. Molecules or atoms of dissimilar metals that were deposited and evaporated by heating are deposited again on the inner and outer surfaces of the cylinder C.
This invention will be described below with reference to the drawings. In FIG. 1, the symbol l is a metal thermos bottle shell, and this shell l
is composed of an inner cylinder 2 and an outer cylinder 8. These inner and outer cylinders z and 8 are usually made of stainless steel and are joined to each other at their upper parts.

Further, a hole 4 for evacuation is formed at the bottom of the outer cylinder 8 with an appropriate diameter. Upper C inner cylinder 2- of this hole 4
Between the outer cylinders 8), a sealing plate 5 having a diameter slightly larger than that of the hole 4 is installed via a metal solder 6 in the form of a rod or powder. The sealing plate 5 is made of the same material as the inner and outer cylinders 2 and 8, and is a vacuum heat-treated metal tl? as described later. 6 closes the hole 4. Inwardly of each of the inner ML outer cylinder 8 and the sealing plate 5, that is, in the entire inner circumferential direction of the shell 1, there is a material such as gold, copper, etc., which has a lower emissivity than gold II (stainless steel) constituting the shell 1. A metal wi7 such as nickel or tin is coated by plating, vapor deposition, coating, or the like. When the shell 1 constructed in this manner is placed in a vacuum heating furnace and subjected to vacuum heating treatment, the atmosphere between the inner cylinder 2 and the outer cylinder 8 is exhausted through the hole 4 at the bottom of the outer cylinder 2.

Next, the metal solder 6 is heated to the melting temperature of the metal solder 6 as shown in FIG. Vacuum heat insulating layer 8 is formed. Through this heat treatment, the dissimilar metal 47 is more firmly attached to the inner peripheral surface of body 1, and the evaporated metal molecules or atoms of dissimilar metal 7 are attached to inner cylinder 2. Outer cylinder 8
When the brazed shell l is slowly cooled under vacuum, it is deposited again on the inner surface of the shell l. Since this redeposition is carried out evenly and gradually by the molecular or atomic metal, an extremely fine-textured mirror rkJ9 is formed on the inner surface of the shell 1.

The metal thermos flask formed in this way has a shell l
14 kinds of metals with low emissivity 7 on the inner surface of the vacuum insulation layer 8
is coated, it is possible to suppress heat radiation from the inner cylinder 3 or outer cylinder 8 into the vacuum insulation layer 8 to a low level, and it is possible to improve the heat retention or cold retention performance of the thermos flask. In addition, 1 inner cylinder 8. Thermal radiation slightly emitted from the outer cylinder 8 into the vacuum insulation layer 8 via the dissimilar metal 7 is radiated by the finely textured mirror surface 9, which further improves the heat retention or cold retention performance of the thermos flask. can be done. Furthermore, according to the manufacturing method of the present invention, the formation of the vacuum heat insulating layer 8 and the formation of the mirror surface 9 can be performed simultaneously, so that the work can be made simple and easy. In addition, since materials such as shielding plates and aluminum vapor-deposited films are not required, manufacturing costs can be reduced.◎ Thermal insulation performance of gold*m* method bottles manufactured as described above To find out, add the same amount of boiling water in the same container (kettle),
So, when I put the thermos with the above structure and a conventional product of the same size and measured the water temperature after the cog time, the following results were obtained.〇 [Measurement results] #II hot conventional product after the cog time・・・・・・・・・℃ Thermos produced by this method・・・・・・P-≦℃ As mentioned above, the metal thermos flask according to the present invention is made of the inner and outer cylinders. By heating the shell under vacuum, the members of the above-mentioned genus can be attached to the inner and outer surfaces of the shell and can be easily manufactured at low manufacturing costs.

[Brief explanation of drawings]

This figure is for explaining the method for manufacturing a thermos flask, where -*lbM is a configuration diagram showing a metal thermos flask shell before heating under vacuum, and Figure 2 is a configuration diagram of a metal thermos flask manufactured by the manufacturing method of the present invention. It is. l...Shell body, 2...Inner tube, butt...
・Outer cylinder, 4...hole, 7...different metal,
8...Vacuum insulation layer, 9...Mirror surface. Figure i

Claims (1)

[Claims] In the method for manufacturing a metal thermos flask, which is a metal thermos flask shell consisting of an inner tube and an outer tube, and which is heated under vacuum to form a vacuum insulation layer between the inner and outer tubes, The inner surface is pre-coated with a dissimilar metal having a low emissivity such as copper. 1. During the heating under vacuum, the dissimilar metal is firmly attached to the inner surface of the shell, and the molecules of the dissimilar metal that are heated and evaporated are A method for manufacturing a metal thermos flask, comprising: re-adhering atoms to the inner surface of the shell to form a thin film layer of different metals; and forming a mirror surface with high reflectivity on the inner surface of the shell.