JPH0226431Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a vacuum container for a tabletop thermos flask with a heater for home use.

BACKGROUND ART Conventionally, this type of vacuum container has a structure to reduce power consumption, as shown in FIG. 1. Also, this inner container 2
Holes 6 and 7 are formed in the bottom of the outer container 3, and a connecting member 13 is provided that is sealed and fixed to the holes 6 and 7 to connect the holes 6 and 7, and this connecting member is made of two disc-shaped plates. A space part 14 is formed inside the two joined disc-shaped sheets, and a nut 15 is fixed to the hole 6 side in this space part 14. The submersible heater 9 has a threaded portion corresponding to the nut 15 at its lower part, and the inner container 2 is inserted through a packing 12 between the bottom of the main body of the submersible heater 9 and the bottom of the inner container 2.
The structure was such that it was held watertight in the inner bottom of the tank.

Problems to be solved by the invention According to the above configuration, the thermal resistance from the inner container 2 to the outer container 3 increases, and the amount of heat radiation decreases because the inner container 2 does not come into contact with the outside air, but there are many welded parts. This resulted in problems such as poor workability and vacuum leaks as the number of welding points increased.

Means for Solving the Problems The present invention has been made to eliminate the above-mentioned drawbacks, and while a thin-walled pipe having a roll thread is provided between the bottom of the inner container and the outer container, the roll thread is attached to the submersible heater. A fixing screw part is formed to fit the

Effects With the above configuration, since it is a thin-walled pipe, its cross-sectional area can be reduced, and since the roll thread part is bellows-like, the extension length of the thin-walled pipe can be increased, and the length of the thin-walled pipe can be increased from the inner container to the outer container. The increased thermal resistance reduces heat radiation and reduces the weight of the vacuum container.

Example An embodiment of the present invention will be described below with reference to the drawings.

The structure of the embodiment is as shown in FIGS. 1 and 2, 1 is a vacuum container, and an outer container 3 has an inner container 2 built therein.
The upper openings are joined together and a vacuum space 4 is formed around the openings. Reference numeral 5 denotes a thin-walled pipe, which serves as a vacuum space 4 at the bottom of the inner container 2 and outer container 3.
The screws pass through the holes 6 and 7 formed at the bottom of each of the holes 6 and 7 to connect the bottoms, and a roll screw portion 8 is formed in the middle. Reference numeral 9 denotes a submersible heater installed at the inner bottom of the inner container 2, from which a fixing screw portion 10 that fits the roll screw portion 8 is formed protruding from the bottom surface. 11 is a lead wire of the submersible heater 9. 12 is a sealing gasket interposed between the bottom of the submersible heater 9 and the bottom of the inner container 2.

The operation of this embodiment having the above configuration will be explained.

In a vacuum container 1 in which the inner container 2 is surrounded by a vacuum space 4 to reduce heat radiation so that the inner container 2 does not come into contact with the atmosphere, the inner container 2 and the outer container 3 are connected, and an underwater container provided inside the inner container 2 is provided. The thin-walled pipe 5 with the roll threaded portion 8 from which the lead wire 11 of the heater 9 is led out has a small diameter and a small cross-sectional area, and the bellows-shaped roll threaded portion 8 is formed, so that the extended length of the thin-walled pipe 5 is increased. As the thermal resistance from the inner container 2 to the outer container 3 increases, heat radiation is reduced and the weight of the vacuum container 1 is also reduced.

Effects of the invention As described above, according to the invention, a thin-walled pipe formed with a roll thread part that communicates and connects the bottom of the inner container and the outer container is provided, and a fixing thread part that fits the roll thread part is formed on the submersible heater. As a result, there are fewer welding points than before, reducing the cause of vacuum leaks, and the cross-sectional area of the thin-walled pipe is small, and the length of the surface is increased, increasing thermal resistance and reducing the amount of heat dissipated. , reliability can be improved, the number of parts can be reduced, and workability and cost can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a cutaway sectional view of the main part of a vacuum container showing an embodiment of the present invention, Fig. 2 is a cutaway sectional view of the main part of the same vacuum container equipped with a submersible heater, and Fig. 3 is a cutaway sectional view of the main part of the vacuum container equipped with a submersible heater. It is a cross-sectional view of the submersible heater attached. 2... Inner container, 3... Outer container, 5... Thin wall pipe, 8... Roll threaded portion, 9... Submersible heater,
10...Fixing screw part.

Claims (1)

[Scope of utility model registration request] In a vacuum container consisting of a double metal bottle having an inner container and an outer container, creating a vacuum space between the two containers, and fixing a submersible heater inside the inner container, the space between the bottoms of the inner container 2 and the outer container 3 is A vacuum vessel characterized in that a thin-walled pipe 5 having a roll threaded portion 8 is provided on the submersible heater 9, and a fixing threaded portion 10 that fits the roll threaded portion 8 is formed on the submersible heater 9.